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gecko/layout/base/nsCSSRendering.cpp
L. David Baron b272e35a61 Change the blur radius for -moz-box-shadow and text-shadow to match what is specified in css3-background, and the blur radius for canvas to follow what is specified in HTML5. (Bug 590039) r=roc a2.0=blocking2.0:beta6 
This fixes the multiplication by 1.5 in
gfxAlphaBoxBlur::CalculateBlurRadius (originally added in changeset
ce9f05b57b95 for bug 467518) to work correctly.  It was previously a
multiplication by 1 due to integer division.  CalculateBlurRadius
previously multiplied by 1.880; it now multiplies by 2.820.

This changes canvas shadow handling to multiply shadowBlur by 2 before
taking its square root, as described in the spec.  This means that
canvas shadow blurs 8px or smaller are 1.5 times larger than they were
previously (due to the CalculateBlurRadius change), and canvas shadow
blurs larger than 8px are 2.121 times larger than they were previously
(due to the CalculateBlurRadius change *and* the additional factor of
sqrt(2)).

This changes text-shadow and -moz-box-shadow handling to use
CalculateBlurRadius on half of the value given instead of passing the
value through directly.  This means that text-shadow and box-shadow
blurs are multiplied by 1.410 relative to their old sizes.  It also
means that we round rather than floor, so that the effect that used to
be drawn by a blur in the range 1px to 1.99px is now drawn by a blur
anywhere in the range 0.36px to 1.05px, the effect that used to be drawn
by a blur in the range 2px to 2.99px is now drawn by a blur anywhere in
the range 1.06px to 1.77px, what used to be a drawn by a blur in the
range 3px to 3.99px is now drawn by a blur anywhere in the range 1.78px
to 2.47px, etc.
2010-09-11 09:27:12 -07:00

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
// vim:cindent:ts=2:et:sw=2:
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Mats Palmgren <mats.palmgren@bredband.net>
* Takeshi Ichimaru <ayakawa.m@gmail.com>
* Masayuki Nakano <masayuki@d-toybox.com>
* L. David Baron <dbaron@dbaron.org>, Mozilla Corporation
* Michael Ventnor <m.ventnor@gmail.com>
* Rob Arnold <robarnold@mozilla.com>
* Jeff Walden <jwalden+code@mit.edu>
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
/* utility functions for drawing borders and backgrounds */
#include "nsStyleConsts.h"
#include "nsPresContext.h"
#include "nsIFrame.h"
#include "nsPoint.h"
#include "nsRect.h"
#include "nsIViewManager.h"
#include "nsIPresShell.h"
#include "nsFrameManager.h"
#include "nsStyleContext.h"
#include "nsGkAtoms.h"
#include "nsCSSAnonBoxes.h"
#include "nsTransform2D.h"
#include "nsIDeviceContext.h"
#include "nsIContent.h"
#include "nsIDocument.h"
#include "nsIScrollableFrame.h"
#include "imgIRequest.h"
#include "imgIContainer.h"
#include "nsCSSRendering.h"
#include "nsCSSColorUtils.h"
#include "nsITheme.h"
#include "nsThemeConstants.h"
#include "nsIServiceManager.h"
#include "nsIHTMLDocument.h"
#include "nsLayoutUtils.h"
#include "nsINameSpaceManager.h"
#include "nsBlockFrame.h"
#include "gfxContext.h"
#include "nsIInterfaceRequestorUtils.h"
#include "gfxPlatform.h"
#include "gfxImageSurface.h"
#include "nsStyleStructInlines.h"
#include "nsCSSFrameConstructor.h"
#include "nsCSSProps.h"
#include "nsContentUtils.h"
#ifdef MOZ_SVG
#include "nsSVGEffects.h"
#include "nsSVGIntegrationUtils.h"
#include "gfxDrawable.h"
#endif
#include "nsCSSRenderingBorders.h"
/**
* This is a small wrapper class to encapsulate image drawing that can draw an
* nsStyleImage image, which may internally be a real image, a sub image, or a
* CSS gradient.
*
* @note Always call the member functions in the order of PrepareImage(),
* ComputeSize(), and Draw().
*/
class ImageRenderer {
public:
enum {
FLAG_SYNC_DECODE_IMAGES = 0x01
};
ImageRenderer(nsIFrame* aForFrame, const nsStyleImage* aImage, PRUint32 aFlags);
~ImageRenderer();
/**
* Populates member variables to get ready for rendering.
* @return PR_TRUE iff the image is ready, and there is at least a pixel to
* draw.
*/
PRBool PrepareImage();
/**
* @return the image size in appunits. CSS gradient images don't have an
* intrinsic size so we have to pass in a default that they will use.
*/
nsSize ComputeSize(const nsSize& aDefault);
/**
* Draws the image to the target rendering context.
* @see nsLayoutUtils::DrawImage() for other parameters
*/
void Draw(nsPresContext* aPresContext,
nsIRenderingContext& aRenderingContext,
const nsRect& aDest,
const nsRect& aFill,
const nsPoint& aAnchor,
const nsRect& aDirty);
private:
nsIFrame* mForFrame;
const nsStyleImage* mImage;
nsStyleImageType mType;
nsCOMPtr<imgIContainer> mImageContainer;
nsRefPtr<nsStyleGradient> mGradientData;
#ifdef MOZ_SVG
nsIFrame* mPaintServerFrame;
nsLayoutUtils::SurfaceFromElementResult mImageElementSurface;
#endif
PRBool mIsReady;
nsSize mSize;
PRUint32 mFlags;
};
// To avoid storing this data on nsInlineFrame (bloat) and to avoid
// recalculating this for each frame in a continuation (perf), hold
// a cache of various coordinate information that we need in order
// to paint inline backgrounds.
struct InlineBackgroundData
{
InlineBackgroundData()
: mFrame(nsnull), mBlockFrame(nsnull)
{
}
~InlineBackgroundData()
{
}
void Reset()
{
mBoundingBox.SetRect(0,0,0,0);
mContinuationPoint = mLineContinuationPoint = mUnbrokenWidth = 0;
mFrame = mBlockFrame = nsnull;
}
nsRect GetContinuousRect(nsIFrame* aFrame)
{
SetFrame(aFrame);
nscoord x;
if (mBidiEnabled) {
x = mLineContinuationPoint;
// Scan continuations on the same line as aFrame and accumulate the widths
// of frames that are to the left (if this is an LTR block) or right
// (if it's RTL) of the current one.
PRBool isRtlBlock = (mBlockFrame->GetStyleVisibility()->mDirection ==
NS_STYLE_DIRECTION_RTL);
nscoord curOffset = aFrame->GetOffsetTo(mBlockFrame).x;
// No need to use our GetPrevContinuation/GetNextContinuation methods
// here, since ib special siblings are certainly not on the same line.
nsIFrame* inlineFrame = aFrame->GetPrevContinuation();
// If the continuation is fluid we know inlineFrame is not on the same line.
// If it's not fluid, we need to test further to be sure.
while (inlineFrame && !inlineFrame->GetNextInFlow() &&
AreOnSameLine(aFrame, inlineFrame)) {
nscoord frameXOffset = inlineFrame->GetOffsetTo(mBlockFrame).x;
if(isRtlBlock == (frameXOffset >= curOffset)) {
x += inlineFrame->GetSize().width;
}
inlineFrame = inlineFrame->GetPrevContinuation();
}
inlineFrame = aFrame->GetNextContinuation();
while (inlineFrame && !inlineFrame->GetPrevInFlow() &&
AreOnSameLine(aFrame, inlineFrame)) {
nscoord frameXOffset = inlineFrame->GetOffsetTo(mBlockFrame).x;
if(isRtlBlock == (frameXOffset >= curOffset)) {
x += inlineFrame->GetSize().width;
}
inlineFrame = inlineFrame->GetNextContinuation();
}
if (isRtlBlock) {
// aFrame itself is also to the right of its left edge, so add its width.
x += aFrame->GetSize().width;
// x is now the distance from the left edge of aFrame to the right edge
// of the unbroken content. Change it to indicate the distance from the
// left edge of the unbroken content to the left edge of aFrame.
x = mUnbrokenWidth - x;
}
} else {
x = mContinuationPoint;
}
// Assume background-origin: border and return a rect with offsets
// relative to (0,0). If we have a different background-origin,
// then our rect should be deflated appropriately by our caller.
return nsRect(-x, 0, mUnbrokenWidth, mFrame->GetSize().height);
}
nsRect GetBoundingRect(nsIFrame* aFrame)
{
SetFrame(aFrame);
// Move the offsets relative to (0,0) which puts the bounding box into
// our coordinate system rather than our parent's. We do this by
// moving it the back distance from us to the bounding box.
// This also assumes background-origin: border, so our caller will
// need to deflate us if needed.
nsRect boundingBox(mBoundingBox);
nsPoint point = mFrame->GetPosition();
boundingBox.MoveBy(-point.x, -point.y);
return boundingBox;
}
protected:
nsIFrame* mFrame;
nsBlockFrame* mBlockFrame;
nsRect mBoundingBox;
nscoord mContinuationPoint;
nscoord mUnbrokenWidth;
nscoord mLineContinuationPoint;
PRBool mBidiEnabled;
void SetFrame(nsIFrame* aFrame)
{
NS_PRECONDITION(aFrame, "Need a frame");
nsIFrame *prevContinuation = GetPrevContinuation(aFrame);
if (!prevContinuation || mFrame != prevContinuation) {
// Ok, we've got the wrong frame. We have to start from scratch.
Reset();
Init(aFrame);
return;
}
// Get our last frame's size and add its width to our continuation
// point before we cache the new frame.
mContinuationPoint += mFrame->GetSize().width;
// If this a new line, update mLineContinuationPoint.
if (mBidiEnabled &&
(aFrame->GetPrevInFlow() || !AreOnSameLine(mFrame, aFrame))) {
mLineContinuationPoint = mContinuationPoint;
}
mFrame = aFrame;
}
nsIFrame* GetPrevContinuation(nsIFrame* aFrame)
{
nsIFrame* prevCont = aFrame->GetPrevContinuation();
if (!prevCont && (aFrame->GetStateBits() & NS_FRAME_IS_SPECIAL)) {
nsIFrame* block = static_cast<nsIFrame*>
(aFrame->Properties().Get(nsIFrame::IBSplitSpecialPrevSibling()));
if (block) {
// The {ib} properties are only stored on first continuations
NS_ASSERTION(!block->GetPrevContinuation(),
"Incorrect value for IBSplitSpecialPrevSibling");
prevCont = static_cast<nsIFrame*>
(block->Properties().Get(nsIFrame::IBSplitSpecialPrevSibling()));
NS_ASSERTION(prevCont, "How did that happen?");
}
}
return prevCont;
}
nsIFrame* GetNextContinuation(nsIFrame* aFrame)
{
nsIFrame* nextCont = aFrame->GetNextContinuation();
if (!nextCont && (aFrame->GetStateBits() & NS_FRAME_IS_SPECIAL)) {
// The {ib} properties are only stored on first continuations
aFrame = aFrame->GetFirstContinuation();
nsIFrame* block = static_cast<nsIFrame*>
(aFrame->Properties().Get(nsIFrame::IBSplitSpecialSibling()));
if (block) {
nextCont = static_cast<nsIFrame*>
(block->Properties().Get(nsIFrame::IBSplitSpecialSibling()));
NS_ASSERTION(nextCont, "How did that happen?");
}
}
return nextCont;
}
void Init(nsIFrame* aFrame)
{
// Start with the previous flow frame as our continuation point
// is the total of the widths of the previous frames.
nsIFrame* inlineFrame = GetPrevContinuation(aFrame);
while (inlineFrame) {
nsRect rect = inlineFrame->GetRect();
mContinuationPoint += rect.width;
mUnbrokenWidth += rect.width;
mBoundingBox.UnionRect(mBoundingBox, rect);
inlineFrame = GetPrevContinuation(inlineFrame);
}
// Next add this frame and subsequent frames to the bounding box and
// unbroken width.
inlineFrame = aFrame;
while (inlineFrame) {
nsRect rect = inlineFrame->GetRect();
mUnbrokenWidth += rect.width;
mBoundingBox.UnionRect(mBoundingBox, rect);
inlineFrame = GetNextContinuation(inlineFrame);
}
mFrame = aFrame;
mBidiEnabled = aFrame->PresContext()->BidiEnabled();
if (mBidiEnabled) {
// Find the containing block frame
nsIFrame* frame = aFrame;
do {
frame = frame->GetParent();
mBlockFrame = do_QueryFrame(frame);
}
while (frame && frame->IsFrameOfType(nsIFrame::eLineParticipant));
NS_ASSERTION(mBlockFrame, "Cannot find containing block.");
mLineContinuationPoint = mContinuationPoint;
}
}
PRBool AreOnSameLine(nsIFrame* aFrame1, nsIFrame* aFrame2) {
// Assumes that aFrame1 and aFrame2 are both decsendants of mBlockFrame.
PRBool isValid1, isValid2;
nsBlockInFlowLineIterator it1(mBlockFrame, aFrame1, &isValid1);
nsBlockInFlowLineIterator it2(mBlockFrame, aFrame2, &isValid2);
return isValid1 && isValid2 && it1.GetLine() == it2.GetLine();
}
};
/* Local functions */
static void PaintBackgroundLayer(nsPresContext* aPresContext,
nsIRenderingContext& aRenderingContext,
nsIFrame* aForFrame,
PRUint32 aFlags,
const nsRect& aDirtyRect,
const nsRect& aBorderArea,
const nsRect& aBGClipRect,
const nsStyleBackground& aBackground,
const nsStyleBackground::Layer& aLayer);
static void DrawBorderImage(nsPresContext* aPresContext,
nsIRenderingContext& aRenderingContext,
nsIFrame* aForFrame,
const nsRect& aBorderArea,
const nsStyleBorder& aStyleBorder,
const nsRect& aDirtyRect);
static void DrawBorderImageComponent(nsIRenderingContext& aRenderingContext,
nsIFrame* aForFrame,
imgIContainer* aImage,
const nsRect& aDirtyRect,
const nsRect& aFill,
const nsIntRect& aSrc,
PRUint8 aHFill,
PRUint8 aVFill,
const nsSize& aUnitSize,
const nsStyleBorder& aStyleBorder,
PRUint8 aIndex);
static nscolor MakeBevelColor(mozilla::css::Side whichSide, PRUint8 style,
nscolor aBackgroundColor,
nscolor aBorderColor);
static InlineBackgroundData* gInlineBGData = nsnull;
// Initialize any static variables used by nsCSSRendering.
nsresult nsCSSRendering::Init()
{
NS_ASSERTION(!gInlineBGData, "Init called twice");
gInlineBGData = new InlineBackgroundData();
if (!gInlineBGData)
return NS_ERROR_OUT_OF_MEMORY;
return NS_OK;
}
// Clean up any global variables used by nsCSSRendering.
void nsCSSRendering::Shutdown()
{
delete gInlineBGData;
gInlineBGData = nsnull;
}
/**
* Make a bevel color
*/
static nscolor
MakeBevelColor(mozilla::css::Side whichSide, PRUint8 style,
nscolor aBackgroundColor, nscolor aBorderColor)
{
nscolor colors[2];
nscolor theColor;
// Given a background color and a border color
// calculate the color used for the shading
NS_GetSpecial3DColors(colors, aBackgroundColor, aBorderColor);
if ((style == NS_STYLE_BORDER_STYLE_OUTSET) ||
(style == NS_STYLE_BORDER_STYLE_RIDGE)) {
// Flip colors for these two border styles
switch (whichSide) {
case NS_SIDE_BOTTOM: whichSide = NS_SIDE_TOP; break;
case NS_SIDE_RIGHT: whichSide = NS_SIDE_LEFT; break;
case NS_SIDE_TOP: whichSide = NS_SIDE_BOTTOM; break;
case NS_SIDE_LEFT: whichSide = NS_SIDE_RIGHT; break;
}
}
switch (whichSide) {
case NS_SIDE_BOTTOM:
theColor = colors[1];
break;
case NS_SIDE_RIGHT:
theColor = colors[1];
break;
case NS_SIDE_TOP:
theColor = colors[0];
break;
case NS_SIDE_LEFT:
default:
theColor = colors[0];
break;
}
return theColor;
}
//----------------------------------------------------------------------
// Thebes Border Rendering Code Start
/*
* Compute the float-pixel radii that should be used for drawing
* this border/outline, given the various input bits.
*/
/* static */ void
nsCSSRendering::ComputePixelRadii(const nscoord *aAppUnitsRadii,
nscoord aAppUnitsPerPixel,
gfxCornerSizes *oBorderRadii)
{
gfxFloat radii[8];
NS_FOR_CSS_HALF_CORNERS(corner)
radii[corner] = gfxFloat(aAppUnitsRadii[corner]) / aAppUnitsPerPixel;
(*oBorderRadii)[C_TL] = gfxSize(radii[NS_CORNER_TOP_LEFT_X],
radii[NS_CORNER_TOP_LEFT_Y]);
(*oBorderRadii)[C_TR] = gfxSize(radii[NS_CORNER_TOP_RIGHT_X],
radii[NS_CORNER_TOP_RIGHT_Y]);
(*oBorderRadii)[C_BR] = gfxSize(radii[NS_CORNER_BOTTOM_RIGHT_X],
radii[NS_CORNER_BOTTOM_RIGHT_Y]);
(*oBorderRadii)[C_BL] = gfxSize(radii[NS_CORNER_BOTTOM_LEFT_X],
radii[NS_CORNER_BOTTOM_LEFT_Y]);
}
void
nsCSSRendering::PaintBorder(nsPresContext* aPresContext,
nsIRenderingContext& aRenderingContext,
nsIFrame* aForFrame,
const nsRect& aDirtyRect,
const nsRect& aBorderArea,
nsStyleContext* aStyleContext,
PRIntn aSkipSides)
{
nsStyleContext *styleIfVisited = aStyleContext->GetStyleIfVisited();
const nsStyleBorder *styleBorder = aStyleContext->GetStyleBorder();
// Don't check RelevantLinkVisited here, since we want to take the
// same amount of time whether or not it's true.
if (!styleIfVisited) {
PaintBorderWithStyleBorder(aPresContext, aRenderingContext, aForFrame,
aDirtyRect, aBorderArea, *styleBorder,
aStyleContext, aSkipSides);
return;
}
nsStyleBorder newStyleBorder(*styleBorder);
// We're making an ephemeral stack copy here, so just copy this debug-only
// member to prevent assertions.
#ifdef DEBUG
newStyleBorder.mImageTracked = styleBorder->mImageTracked;
#endif
NS_FOR_CSS_SIDES(side) {
newStyleBorder.SetBorderColor(side,
aStyleContext->GetVisitedDependentColor(
nsCSSProps::SubpropertyEntryFor(eCSSProperty_border_color)[side]));
}
PaintBorderWithStyleBorder(aPresContext, aRenderingContext, aForFrame,
aDirtyRect, aBorderArea, newStyleBorder,
aStyleContext, aSkipSides);
#ifdef DEBUG
newStyleBorder.mImageTracked = false;
#endif
}
void
nsCSSRendering::PaintBorderWithStyleBorder(nsPresContext* aPresContext,
nsIRenderingContext& aRenderingContext,
nsIFrame* aForFrame,
const nsRect& aDirtyRect,
const nsRect& aBorderArea,
const nsStyleBorder& aStyleBorder,
nsStyleContext* aStyleContext,
PRIntn aSkipSides)
{
nsMargin border;
nscoord twipsRadii[8];
nsCompatibility compatMode = aPresContext->CompatibilityMode();
SN("++ PaintBorder");
// Check to see if we have an appearance defined. If so, we let the theme
// renderer draw the border. DO not get the data from aForFrame, since the passed in style context
// may be different! Always use |aStyleContext|!
const nsStyleDisplay* displayData = aStyleContext->GetStyleDisplay();
if (displayData->mAppearance) {
nsITheme *theme = aPresContext->GetTheme();
if (theme && theme->ThemeSupportsWidget(aPresContext, aForFrame, displayData->mAppearance))
return; // Let the theme handle it.
}
if (aStyleBorder.IsBorderImageLoaded()) {
DrawBorderImage(aPresContext, aRenderingContext, aForFrame,
aBorderArea, aStyleBorder, aDirtyRect);
return;
}
// Get our style context's color struct.
const nsStyleColor* ourColor = aStyleContext->GetStyleColor();
// in NavQuirks mode we want to use the parent's context as a starting point
// for determining the background color
nsIFrame* bgFrame = nsCSSRendering::FindNonTransparentBackgroundFrame
(aForFrame, compatMode == eCompatibility_NavQuirks ? PR_TRUE : PR_FALSE);
nsStyleContext* bgContext = bgFrame->GetStyleContext();
nscolor bgColor =
bgContext->GetVisitedDependentColor(eCSSProperty_background_color);
border = aStyleBorder.GetComputedBorder();
if ((0 == border.left) && (0 == border.right) &&
(0 == border.top) && (0 == border.bottom)) {
// Empty border area
return;
}
nsSize frameSize = aForFrame->GetSize();
if (&aStyleBorder == aForFrame->GetStyleBorder() &&
frameSize == aBorderArea.Size()) {
aForFrame->GetBorderRadii(twipsRadii);
} else {
nsIFrame::ComputeBorderRadii(aStyleBorder.mBorderRadius, frameSize,
aBorderArea.Size(), aSkipSides, twipsRadii);
}
// Turn off rendering for all of the zero sized sides
if (aSkipSides & SIDE_BIT_TOP) border.top = 0;
if (aSkipSides & SIDE_BIT_RIGHT) border.right = 0;
if (aSkipSides & SIDE_BIT_BOTTOM) border.bottom = 0;
if (aSkipSides & SIDE_BIT_LEFT) border.left = 0;
// get the inside and outside parts of the border
nsRect outerRect(aBorderArea);
SF(" outerRect: %d %d %d %d\n", outerRect.x, outerRect.y, outerRect.width, outerRect.height);
// we can assume that we're already clipped to aDirtyRect -- I think? (!?)
// Get our conversion values
nscoord twipsPerPixel = aPresContext->DevPixelsToAppUnits(1);
// convert outer and inner rects
gfxRect oRect(nsLayoutUtils::RectToGfxRect(outerRect, twipsPerPixel));
// convert the border widths
gfxFloat borderWidths[4] = { gfxFloat(border.top / twipsPerPixel),
gfxFloat(border.right / twipsPerPixel),
gfxFloat(border.bottom / twipsPerPixel),
gfxFloat(border.left / twipsPerPixel) };
// convert the radii
gfxCornerSizes borderRadii;
ComputePixelRadii(twipsRadii, twipsPerPixel, &borderRadii);
PRUint8 borderStyles[4];
nscolor borderColors[4];
nsBorderColors *compositeColors[4];
// pull out styles, colors, composite colors
NS_FOR_CSS_SIDES (i) {
PRBool foreground;
borderStyles[i] = aStyleBorder.GetBorderStyle(i);
aStyleBorder.GetBorderColor(i, borderColors[i], foreground);
aStyleBorder.GetCompositeColors(i, &compositeColors[i]);
if (foreground)
borderColors[i] = ourColor->mColor;
}
SF(" borderStyles: %d %d %d %d\n", borderStyles[0], borderStyles[1], borderStyles[2], borderStyles[3]);
// start drawing
gfxContext *ctx = aRenderingContext.ThebesContext();
ctx->Save();
#if 0
// this will draw a transparent red backround underneath the oRect area
ctx->Save();
ctx->Rectangle(oRect);
ctx->SetColor(gfxRGBA(1.0, 0.0, 0.0, 0.5));
ctx->Fill();
ctx->Restore();
#endif
//SF ("borderRadii: %f %f %f %f\n", borderRadii[0], borderRadii[1], borderRadii[2], borderRadii[3]);
nsCSSBorderRenderer br(twipsPerPixel,
ctx,
oRect,
borderStyles,
borderWidths,
borderRadii,
borderColors,
compositeColors,
aSkipSides,
bgColor);
br.DrawBorders();
ctx->Restore();
SN();
}
static nsRect
GetOutlineInnerRect(nsIFrame* aFrame)
{
nsRect* savedOutlineInnerRect = static_cast<nsRect*>
(aFrame->Properties().Get(nsIFrame::OutlineInnerRectProperty()));
if (savedOutlineInnerRect)
return *savedOutlineInnerRect;
return aFrame->GetOverflowRect();
}
void
nsCSSRendering::PaintOutline(nsPresContext* aPresContext,
nsIRenderingContext& aRenderingContext,
nsIFrame* aForFrame,
const nsRect& aDirtyRect,
const nsRect& aBorderArea,
nsStyleContext* aStyleContext)
{
nscoord twipsRadii[8];
// Get our style context's color struct.
const nsStyleOutline* ourOutline = aStyleContext->GetStyleOutline();
nscoord width;
ourOutline->GetOutlineWidth(width);
if (width == 0) {
// Empty outline
return;
}
nsIFrame* bgFrame = nsCSSRendering::FindNonTransparentBackgroundFrame
(aForFrame, PR_FALSE);
nsStyleContext* bgContext = bgFrame->GetStyleContext();
nscolor bgColor =
bgContext->GetVisitedDependentColor(eCSSProperty_background_color);
// When the outline property is set on :-moz-anonymous-block or
// :-moz-anonyomus-positioned-block pseudo-elements, it inherited that
// outline from the inline that was broken because it contained a
// block. In that case, we don't want a really wide outline if the
// block inside the inline is narrow, so union the actual contents of
// the anonymous blocks.
nsIFrame *frameForArea = aForFrame;
do {
nsIAtom *pseudoType = frameForArea->GetStyleContext()->GetPseudo();
if (pseudoType != nsCSSAnonBoxes::mozAnonymousBlock &&
pseudoType != nsCSSAnonBoxes::mozAnonymousPositionedBlock)
break;
// If we're done, we really want it and all its later siblings.
frameForArea = frameForArea->GetFirstChild(nsnull);
NS_ASSERTION(frameForArea, "anonymous block with no children?");
} while (frameForArea);
nsRect innerRect; // relative to aBorderArea.TopLeft()
if (frameForArea == aForFrame) {
innerRect = GetOutlineInnerRect(aForFrame);
} else {
for (; frameForArea; frameForArea = frameForArea->GetNextSibling()) {
// The outline has already been included in aForFrame's overflow
// area, but not in those of its descendants, so we have to
// include it. Otherwise we'll end up drawing the outline inside
// the border.
nsRect r(GetOutlineInnerRect(frameForArea) +
frameForArea->GetOffsetTo(aForFrame));
innerRect.UnionRect(innerRect, r);
}
}
innerRect += aBorderArea.TopLeft();
nscoord offset = ourOutline->mOutlineOffset;
innerRect.Inflate(offset, offset);
// If the dirty rect is completely inside the border area (e.g., only the
// content is being painted), then we can skip out now
// XXX this isn't exactly true for rounded borders, where the inside curves may
// encroach into the content area. A safer calculation would be to
// shorten insideRect by the radius one each side before performing this test.
if (innerRect.Contains(aDirtyRect))
return;
nsRect outerRect = innerRect;
outerRect.Inflate(width, width);
// get the radius for our outline
nsIFrame::ComputeBorderRadii(ourOutline->mOutlineRadius, aBorderArea.Size(),
outerRect.Size(), 0, twipsRadii);
// Get our conversion values
nscoord twipsPerPixel = aPresContext->DevPixelsToAppUnits(1);
// get the outer rectangles
gfxRect oRect(nsLayoutUtils::RectToGfxRect(outerRect, twipsPerPixel));
// convert the radii
nsMargin outlineMargin(width, width, width, width);
gfxCornerSizes outlineRadii;
ComputePixelRadii(twipsRadii, twipsPerPixel, &outlineRadii);
PRUint8 outlineStyle = ourOutline->GetOutlineStyle();
PRUint8 outlineStyles[4] = { outlineStyle,
outlineStyle,
outlineStyle,
outlineStyle };
// This handles treating the initial color as 'currentColor'; if we
// ever want 'invert' back we'll need to do a bit of work here too.
nscolor outlineColor =
aStyleContext->GetVisitedDependentColor(eCSSProperty_outline_color);
nscolor outlineColors[4] = { outlineColor,
outlineColor,
outlineColor,
outlineColor };
// convert the border widths
gfxFloat outlineWidths[4] = { gfxFloat(width / twipsPerPixel),
gfxFloat(width / twipsPerPixel),
gfxFloat(width / twipsPerPixel),
gfxFloat(width / twipsPerPixel) };
// start drawing
gfxContext *ctx = aRenderingContext.ThebesContext();
ctx->Save();
nsCSSBorderRenderer br(twipsPerPixel,
ctx,
oRect,
outlineStyles,
outlineWidths,
outlineRadii,
outlineColors,
nsnull, 0,
bgColor);
br.DrawBorders();
ctx->Restore();
SN();
}
void
nsCSSRendering::PaintFocus(nsPresContext* aPresContext,
nsIRenderingContext& aRenderingContext,
const nsRect& aFocusRect,
nscolor aColor)
{
nscoord oneCSSPixel = nsPresContext::CSSPixelsToAppUnits(1);
nscoord oneDevPixel = aPresContext->DevPixelsToAppUnits(1);
gfxRect focusRect(nsLayoutUtils::RectToGfxRect(aFocusRect, oneDevPixel));
gfxCornerSizes focusRadii;
{
nscoord twipsRadii[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };
ComputePixelRadii(twipsRadii, oneDevPixel, &focusRadii);
}
gfxFloat focusWidths[4] = { gfxFloat(oneCSSPixel / oneDevPixel),
gfxFloat(oneCSSPixel / oneDevPixel),
gfxFloat(oneCSSPixel / oneDevPixel),
gfxFloat(oneCSSPixel / oneDevPixel) };
PRUint8 focusStyles[4] = { NS_STYLE_BORDER_STYLE_DOTTED,
NS_STYLE_BORDER_STYLE_DOTTED,
NS_STYLE_BORDER_STYLE_DOTTED,
NS_STYLE_BORDER_STYLE_DOTTED };
nscolor focusColors[4] = { aColor, aColor, aColor, aColor };
gfxContext *ctx = aRenderingContext.ThebesContext();
ctx->Save();
// Because this renders a dotted border, the background color
// should not be used. Therefore, we provide a value that will
// be blatantly wrong if it ever does get used. (If this becomes
// something that CSS can style, this function will then have access
// to a style context and can use the same logic that PaintBorder
// and PaintOutline do.)
nsCSSBorderRenderer br(oneDevPixel,
ctx,
focusRect,
focusStyles,
focusWidths,
focusRadii,
focusColors,
nsnull, 0,
NS_RGB(255, 0, 0));
br.DrawBorders();
ctx->Restore();
SN();
}
// Thebes Border Rendering Code End
//----------------------------------------------------------------------
//----------------------------------------------------------------------
/**
* Computes the placement of a background image.
*
* @param aOriginBounds is the box to which the tiling position should be
* relative
* This should correspond to 'background-origin' for the frame,
* except when painting on the canvas, in which case the origin bounds
* should be the bounds of the root element's frame.
* @param aTopLeft the top-left corner where an image tile should be drawn
* @param aAnchorPoint a point which should be pixel-aligned by
* nsLayoutUtils::DrawImage. This is the same as aTopLeft, unless CSS
* specifies a percentage (including 'right' or 'bottom'), in which case
* it's that percentage within of aOriginBounds. So 'right' would set
* aAnchorPoint.x to aOriginBounds.XMost().
*
* Points are returned relative to aOriginBounds.
*/
static void
ComputeBackgroundAnchorPoint(const nsStyleBackground::Layer& aLayer,
const nsSize& aOriginBounds,
const nsSize& aImageSize,
nsPoint* aTopLeft,
nsPoint* aAnchorPoint)
{
if (!aLayer.mPosition.mXIsPercent) {
aTopLeft->x = aAnchorPoint->x = aLayer.mPosition.mXPosition.mCoord;
}
else {
double percent = aLayer.mPosition.mXPosition.mFloat;
aAnchorPoint->x = NSToCoordRound(percent*aOriginBounds.width);
aTopLeft->x = NSToCoordRound(percent*(aOriginBounds.width - aImageSize.width));
}
if (!aLayer.mPosition.mYIsPercent) {
aTopLeft->y = aAnchorPoint->y = aLayer.mPosition.mYPosition.mCoord;
}
else {
double percent = aLayer.mPosition.mYPosition.mFloat;
aAnchorPoint->y = NSToCoordRound(percent*aOriginBounds.height);
aTopLeft->y = NSToCoordRound(percent*(aOriginBounds.height - aImageSize.height));
}
}
nsIFrame*
nsCSSRendering::FindNonTransparentBackgroundFrame(nsIFrame* aFrame,
PRBool aStartAtParent /*= PR_FALSE*/)
{
NS_ASSERTION(aFrame, "Cannot find NonTransparentBackgroundFrame in a null frame");
nsIFrame* frame = nsnull;
if (aStartAtParent) {
frame = nsLayoutUtils::GetParentOrPlaceholderFor(
aFrame->PresContext()->FrameManager(), aFrame);
}
if (!frame) {
frame = aFrame;
}
while (frame) {
// No need to call GetVisitedDependentColor because it always uses
// this alpha component anyway.
if (NS_GET_A(frame->GetStyleBackground()->mBackgroundColor) > 0)
break;
if (frame->IsThemed())
break;
nsIFrame* parent = nsLayoutUtils::GetParentOrPlaceholderFor(
frame->PresContext()->FrameManager(), frame);
if (!parent)
break;
frame = parent;
}
return frame;
}
// Returns true if aFrame is a canvas frame.
// We need to treat the viewport as canvas because, even though
// it does not actually paint a background, we need to get the right
// background style so we correctly detect transparent documents.
PRBool
nsCSSRendering::IsCanvasFrame(nsIFrame* aFrame)
{
nsIAtom* frameType = aFrame->GetType();
return frameType == nsGkAtoms::canvasFrame ||
frameType == nsGkAtoms::rootFrame ||
frameType == nsGkAtoms::pageFrame ||
frameType == nsGkAtoms::pageContentFrame ||
frameType == nsGkAtoms::viewportFrame;
}
nsIFrame*
nsCSSRendering::FindBackgroundStyleFrame(nsIFrame* aForFrame)
{
const nsStyleBackground* result = aForFrame->GetStyleBackground();
// Check if we need to do propagation from BODY rather than HTML.
if (result->IsTransparent()) {
nsIContent* content = aForFrame->GetContent();
// The root element content can't be null. We wouldn't know what
// frame to create for aFrame.
// Use |GetOwnerDoc| so it works during destruction.
if (content) {
nsIDocument* document = content->GetOwnerDoc();
nsCOMPtr<nsIHTMLDocument> htmlDoc = do_QueryInterface(document);
if (htmlDoc) {
nsIContent* bodyContent = htmlDoc->GetBodyContentExternal();
// We need to null check the body node (bug 118829) since
// there are cases, thanks to the fix for bug 5569, where we
// will reflow a document with no body. In particular, if a
// SCRIPT element in the head blocks the parser and then has a
// SCRIPT that does "document.location.href = 'foo'", then
// nsParser::Terminate will call |DidBuildModel| methods
// through to the content sink, which will call |StartLayout|
// and thus |InitialReflow| on the pres shell. See bug 119351
// for the ugly details.
if (bodyContent) {
nsIFrame *bodyFrame = bodyContent->GetPrimaryFrame();
if (bodyFrame) {
return nsLayoutUtils::GetStyleFrame(bodyFrame);
}
}
}
}
}
return aForFrame;
}
/**
* |FindBackground| finds the correct style data to use to paint the
* background. It is responsible for handling the following two
* statements in section 14.2 of CSS2:
*
* The background of the box generated by the root element covers the
* entire canvas.
*
* For HTML documents, however, we recommend that authors specify the
* background for the BODY element rather than the HTML element. User
* agents should observe the following precedence rules to fill in the
* background: if the value of the 'background' property for the HTML
* element is different from 'transparent' then use it, else use the
* value of the 'background' property for the BODY element. If the
* resulting value is 'transparent', the rendering is undefined.
*
* Thus, in our implementation, it is responsible for ensuring that:
* + we paint the correct background on the |nsCanvasFrame|,
* |nsRootBoxFrame|, or |nsPageFrame|,
* + we don't paint the background on the root element, and
* + we don't paint the background on the BODY element in *some* cases,
* and for SGML-based HTML documents only.
*
* |FindBackground| returns true if a background should be painted, and
* the resulting style context to use for the background information
* will be filled in to |aBackground|.
*/
nsStyleContext*
nsCSSRendering::FindRootFrameBackground(nsIFrame* aForFrame)
{
return FindBackgroundStyleFrame(aForFrame)->GetStyleContext();
}
inline PRBool
FindElementBackground(nsIFrame* aForFrame, nsIFrame* aRootElementFrame,
nsStyleContext** aBackgroundSC)
{
if (aForFrame == aRootElementFrame) {
// We must have propagated our background to the viewport or canvas. Abort.
return PR_FALSE;
}
*aBackgroundSC = aForFrame->GetStyleContext();
// Return true unless the frame is for a BODY element whose background
// was propagated to the viewport.
nsIContent* content = aForFrame->GetContent();
if (!content || content->Tag() != nsGkAtoms::body)
return PR_TRUE; // not frame for a "body" element
// It could be a non-HTML "body" element but that's OK, we'd fail the
// bodyContent check below
if (aForFrame->GetStyleContext()->GetPseudo())
return PR_TRUE; // A pseudo-element frame.
// We should only look at the <html> background if we're in an HTML document
nsIDocument* document = content->GetOwnerDoc();
nsCOMPtr<nsIHTMLDocument> htmlDoc = do_QueryInterface(document);
if (!htmlDoc)
return PR_TRUE;
nsIContent* bodyContent = htmlDoc->GetBodyContentExternal();
if (bodyContent != content)
return PR_TRUE; // this wasn't the background that was propagated
// This can be called even when there's no root element yet, during frame
// construction, via nsLayoutUtils::FrameHasTransparency and
// nsContainerFrame::SyncFrameViewProperties.
if (!aRootElementFrame)
return PR_TRUE;
const nsStyleBackground* htmlBG = aRootElementFrame->GetStyleBackground();
return !htmlBG->IsTransparent();
}
PRBool
nsCSSRendering::FindBackground(nsPresContext* aPresContext,
nsIFrame* aForFrame,
nsStyleContext** aBackgroundSC)
{
nsIFrame* rootElementFrame =
aPresContext->PresShell()->FrameConstructor()->GetRootElementStyleFrame();
if (IsCanvasFrame(aForFrame)) {
*aBackgroundSC = FindCanvasBackground(aForFrame, rootElementFrame);
return PR_TRUE;
} else {
return FindElementBackground(aForFrame, rootElementFrame, aBackgroundSC);
}
}
void
nsCSSRendering::DidPaint()
{
gInlineBGData->Reset();
}
void
nsCSSRendering::PaintBoxShadowOuter(nsPresContext* aPresContext,
nsIRenderingContext& aRenderingContext,
nsIFrame* aForFrame,
const nsRect& aFrameArea,
const nsRect& aDirtyRect)
{
const nsStyleBorder* styleBorder = aForFrame->GetStyleBorder();
nsCSSShadowArray* shadows = styleBorder->mBoxShadow;
if (!shadows)
return;
nscoord twipsPerPixel = aPresContext->DevPixelsToAppUnits(1);
PRBool hasBorderRadius;
PRBool nativeTheme; // mutually exclusive with hasBorderRadius
gfxCornerSizes borderRadii;
// Get any border radius, since box-shadow must also have rounded corners if the frame does
const nsStyleDisplay* styleDisplay = aForFrame->GetStyleDisplay();
nsITheme::Transparency transparency;
if (aForFrame->IsThemed(styleDisplay, &transparency)) {
// We don't respect border-radius for native-themed widgets
hasBorderRadius = PR_FALSE;
// For opaque (rectangular) theme widgets we can take the generic
// border-box path with border-radius disabled.
nativeTheme = transparency != nsITheme::eOpaque;
} else {
nativeTheme = PR_FALSE;
nscoord twipsRadii[8];
NS_ASSERTION(aFrameArea.Size() == aForFrame->GetSize(), "unexpected size");
hasBorderRadius = aForFrame->GetBorderRadii(twipsRadii);
if (hasBorderRadius) {
ComputePixelRadii(twipsRadii, twipsPerPixel, &borderRadii);
}
}
nsRect frameRect =
nativeTheme ? aForFrame->GetOverflowRectRelativeToSelf() + aFrameArea.TopLeft() : aFrameArea;
gfxRect frameGfxRect(nsLayoutUtils::RectToGfxRect(frameRect, twipsPerPixel));
frameGfxRect.Round();
// We don't show anything that intersects with the frame we're blurring on. So tell the
// blurrer not to do unnecessary work there.
gfxRect skipGfxRect = frameGfxRect;
PRBool useSkipGfxRect = PR_TRUE;
if (nativeTheme) {
// Optimize non-leaf native-themed frames by skipping computing pixels
// in the padding-box. We assume the padding-box is going to be painted
// opaquely for non-leaf frames.
// XXX this may not be a safe assumption; we should make this go away
// by optimizing box-shadow drawing more for the cases where we don't have a skip-rect.
useSkipGfxRect = !aForFrame->IsLeaf();
nsRect paddingRect =
aForFrame->GetPaddingRect() - aForFrame->GetPosition() + aFrameArea.TopLeft();
skipGfxRect = nsLayoutUtils::RectToGfxRect(paddingRect, twipsPerPixel);
} else if (hasBorderRadius) {
skipGfxRect.Inset(
PR_MAX(borderRadii[C_TL].height, borderRadii[C_TR].height), 0,
PR_MAX(borderRadii[C_BL].height, borderRadii[C_BR].height), 0);
}
for (PRUint32 i = shadows->Length(); i > 0; --i) {
nsCSSShadowItem* shadowItem = shadows->ShadowAt(i - 1);
if (shadowItem->mInset)
continue;
nsRect shadowRect = frameRect;
shadowRect.MoveBy(shadowItem->mXOffset, shadowItem->mYOffset);
nscoord pixelSpreadRadius;
if (nativeTheme) {
pixelSpreadRadius = shadowItem->mSpread;
} else {
shadowRect.Inflate(shadowItem->mSpread, shadowItem->mSpread);
pixelSpreadRadius = 0;
}
// shadowRect won't include the blur, so make an extra rect here that includes the blur
// for use in the even-odd rule below.
nsRect shadowRectPlusBlur = shadowRect;
nscoord blurRadius = shadowItem->mRadius;
shadowRectPlusBlur.Inflate(
nsContextBoxBlur::GetBlurRadiusMargin(blurRadius, twipsPerPixel));
gfxRect shadowGfxRect =
nsLayoutUtils::RectToGfxRect(shadowRect, twipsPerPixel);
gfxRect shadowGfxRectPlusBlur =
nsLayoutUtils::RectToGfxRect(shadowRectPlusBlur, twipsPerPixel);
shadowGfxRect.Round();
shadowGfxRectPlusBlur.RoundOut();
gfxContext* renderContext = aRenderingContext.ThebesContext();
nsRefPtr<gfxContext> shadowContext;
nsContextBoxBlur blurringArea;
// When getting the widget shape from the native theme, we're going
// to draw the widget into the shadow surface to create a mask.
// We need to ensure that there actually *is* a shadow surface
// and that we're not going to draw directly into renderContext.
shadowContext =
blurringArea.Init(shadowRect, pixelSpreadRadius,
blurRadius, twipsPerPixel, renderContext, aDirtyRect,
useSkipGfxRect ? &skipGfxRect : nsnull,
nativeTheme ? nsContextBoxBlur::FORCE_MASK : 0);
if (!shadowContext)
continue;
// Set the shadow color; if not specified, use the foreground color
nscolor shadowColor;
if (shadowItem->mHasColor)
shadowColor = shadowItem->mColor;
else
shadowColor = aForFrame->GetStyleColor()->mColor;
renderContext->Save();
renderContext->SetColor(gfxRGBA(shadowColor));
// Draw the shape of the frame so it can be blurred. Recall how nsContextBoxBlur
// doesn't make any temporary surfaces if blur is 0 and it just returns the original
// surface? If we have no blur, we're painting this fill on the actual content surface
// (renderContext == shadowContext) which is why we set up the color and clip
// before doing this.
if (nativeTheme) {
// We don't clip the border-box from the shadow, nor any other box.
// We assume that the native theme is going to paint over the shadow.
// Draw the widget shape
gfxContextMatrixAutoSaveRestore save(shadowContext);
nsIDeviceContext* devCtx = aPresContext->DeviceContext();
nsCOMPtr<nsIRenderingContext> wrapperCtx;
devCtx->CreateRenderingContextInstance(*getter_AddRefs(wrapperCtx));
wrapperCtx->Init(devCtx, shadowContext);
wrapperCtx->Translate(shadowItem->mXOffset, shadowItem->mYOffset);
aPresContext->GetTheme()->DrawWidgetBackground(wrapperCtx, aForFrame,
styleDisplay->mAppearance, aFrameArea, frameRect);
} else {
// Clip out the area of the actual frame so the shadow is not shown within
// the frame
renderContext->NewPath();
renderContext->Rectangle(shadowGfxRectPlusBlur);
if (hasBorderRadius) {
renderContext->RoundedRectangle(frameGfxRect, borderRadii);
} else {
renderContext->Rectangle(frameGfxRect);
}
renderContext->SetFillRule(gfxContext::FILL_RULE_EVEN_ODD);
renderContext->Clip();
shadowContext->NewPath();
if (hasBorderRadius) {
gfxCornerSizes clipRectRadii;
gfxFloat spreadDistance = -shadowItem->mSpread / twipsPerPixel;
gfxFloat borderSizes[4] = { 0, 0, 0, 0 };
// We only give the spread radius to corners with a radius on them, otherwise we'll
// give a rounded shadow corner to a frame corner with 0 border radius, should
// the author use non-uniform border radii sizes (border-top-left-radius etc)
// (bug 514670)
if (borderRadii[C_TL].width > 0 || borderRadii[C_BL].width > 0) {
borderSizes[NS_SIDE_LEFT] = spreadDistance;
}
if (borderRadii[C_TL].height > 0 || borderRadii[C_TR].height > 0) {
borderSizes[NS_SIDE_TOP] = spreadDistance;
}
if (borderRadii[C_TR].width > 0 || borderRadii[C_BR].width > 0) {
borderSizes[NS_SIDE_RIGHT] = spreadDistance;
}
if (borderRadii[C_BL].height > 0 || borderRadii[C_BR].height > 0) {
borderSizes[NS_SIDE_BOTTOM] = spreadDistance;
}
nsCSSBorderRenderer::ComputeInnerRadii(borderRadii, borderSizes,
&clipRectRadii);
shadowContext->RoundedRectangle(shadowGfxRect, clipRectRadii);
} else {
shadowContext->Rectangle(shadowGfxRect);
}
shadowContext->Fill();
}
blurringArea.DoPaint();
renderContext->Restore();
}
}
void
nsCSSRendering::PaintBoxShadowInner(nsPresContext* aPresContext,
nsIRenderingContext& aRenderingContext,
nsIFrame* aForFrame,
const nsRect& aFrameArea,
const nsRect& aDirtyRect)
{
const nsStyleBorder* styleBorder = aForFrame->GetStyleBorder();
nsCSSShadowArray* shadows = styleBorder->mBoxShadow;
if (!shadows)
return;
if (aForFrame->IsThemed() && aForFrame->GetContent() &&
!nsContentUtils::IsChromeDoc(aForFrame->GetContent()->GetCurrentDoc())) {
// There's no way of getting hold of a shape corresponding to a
// "padding-box" for native-themed widgets, so just don't draw
// inner box-shadows for them. But we allow chrome to paint inner
// box shadows since chrome can be aware of the platform theme.
return;
}
// Get any border radius, since box-shadow must also have rounded corners if the frame does
nscoord twipsRadii[8];
NS_ASSERTION(aFrameArea.Size() == aForFrame->GetSize(), "unexpected size");
PRBool hasBorderRadius = aForFrame->GetBorderRadii(twipsRadii);
nscoord twipsPerPixel = aPresContext->DevPixelsToAppUnits(1);
nsRect paddingRect = aFrameArea;
nsMargin border = aForFrame->GetUsedBorder();
aForFrame->ApplySkipSides(border);
paddingRect.Deflate(border);
gfxCornerSizes innerRadii;
if (hasBorderRadius) {
gfxCornerSizes borderRadii;
ComputePixelRadii(twipsRadii, twipsPerPixel, &borderRadii);
gfxFloat borderSizes[4] = {
gfxFloat(border.top / twipsPerPixel),
gfxFloat(border.right / twipsPerPixel),
gfxFloat(border.bottom / twipsPerPixel),
gfxFloat(border.left / twipsPerPixel)
};
nsCSSBorderRenderer::ComputeInnerRadii(borderRadii, borderSizes,
&innerRadii);
}
for (PRUint32 i = shadows->Length(); i > 0; --i) {
nsCSSShadowItem* shadowItem = shadows->ShadowAt(i - 1);
if (!shadowItem->mInset)
continue;
/*
* shadowRect: the frame's padding rect
* shadowPaintRect: the area to paint on the temp surface, larger than shadowRect
* so that blurs still happen properly near the edges
* shadowClipRect: the area on the temporary surface within shadowPaintRect
* that we will NOT paint in
*/
nscoord blurRadius = shadowItem->mRadius;
nsMargin blurMargin =
nsContextBoxBlur::GetBlurRadiusMargin(blurRadius, twipsPerPixel);
nsRect shadowPaintRect = paddingRect;
shadowPaintRect.Inflate(blurMargin);
nsRect shadowClipRect = paddingRect;
shadowClipRect.MoveBy(shadowItem->mXOffset, shadowItem->mYOffset);
shadowClipRect.Deflate(shadowItem->mSpread, shadowItem->mSpread);
gfxCornerSizes clipRectRadii;
if (hasBorderRadius) {
// Calculate the radii the inner clipping rect will have
gfxFloat spreadDistance = shadowItem->mSpread / twipsPerPixel;
gfxFloat borderSizes[4] = {0, 0, 0, 0};
// See PaintBoxShadowOuter and bug 514670
if (innerRadii[C_TL].width > 0 || innerRadii[C_BL].width > 0) {
borderSizes[NS_SIDE_LEFT] = spreadDistance;
}
if (innerRadii[C_TL].height > 0 || innerRadii[C_TR].height > 0) {
borderSizes[NS_SIDE_TOP] = spreadDistance;
}
if (innerRadii[C_TR].width > 0 || innerRadii[C_BR].width > 0) {
borderSizes[NS_SIDE_RIGHT] = spreadDistance;
}
if (innerRadii[C_BL].height > 0 || innerRadii[C_BR].height > 0) {
borderSizes[NS_SIDE_BOTTOM] = spreadDistance;
}
nsCSSBorderRenderer::ComputeInnerRadii(innerRadii, borderSizes,
&clipRectRadii);
}
// Set the "skip rect" to the area within the frame that we don't paint in,
// including after blurring. We also use this for clipping later on.
nsRect skipRect = shadowClipRect;
skipRect.Deflate(blurMargin);
gfxRect skipGfxRect = nsLayoutUtils::RectToGfxRect(skipRect, twipsPerPixel);
if (hasBorderRadius) {
skipGfxRect.Inset(PR_MAX(clipRectRadii[C_TL].height, clipRectRadii[C_TR].height), 0,
PR_MAX(clipRectRadii[C_BL].height, clipRectRadii[C_BR].height), 0);
}
gfxContext* renderContext = aRenderingContext.ThebesContext();
nsRefPtr<gfxContext> shadowContext;
nsContextBoxBlur blurringArea;
shadowContext = blurringArea.Init(shadowPaintRect, 0, blurRadius, twipsPerPixel, renderContext,
aDirtyRect, &skipGfxRect);
if (!shadowContext)
continue;
// Set the shadow color; if not specified, use the foreground color
nscolor shadowColor;
if (shadowItem->mHasColor)
shadowColor = shadowItem->mColor;
else
shadowColor = aForFrame->GetStyleColor()->mColor;
renderContext->Save();
renderContext->SetColor(gfxRGBA(shadowColor));
// Clip the context to the area of the frame's padding rect, so no part of the
// shadow is painted outside. Also cut out anything beyond where the inset shadow
// will be.
gfxRect shadowGfxRect =
nsLayoutUtils::RectToGfxRect(paddingRect, twipsPerPixel);
shadowGfxRect.Round();
renderContext->NewPath();
if (hasBorderRadius)
renderContext->RoundedRectangle(shadowGfxRect, innerRadii, PR_FALSE);
else
renderContext->Rectangle(shadowGfxRect);
renderContext->Rectangle(skipGfxRect);
renderContext->SetFillRule(gfxContext::FILL_RULE_EVEN_ODD);
renderContext->Clip();
// Fill the temporary surface minus the area within the frame that we should
// not paint in, and blur and apply it
gfxRect shadowPaintGfxRect =
nsLayoutUtils::RectToGfxRect(shadowPaintRect, twipsPerPixel);
shadowPaintGfxRect.RoundOut();
gfxRect shadowClipGfxRect =
nsLayoutUtils::RectToGfxRect(shadowClipRect, twipsPerPixel);
shadowClipGfxRect.Round();
shadowContext->NewPath();
shadowContext->Rectangle(shadowPaintGfxRect);
if (hasBorderRadius)
shadowContext->RoundedRectangle(shadowClipGfxRect, clipRectRadii, PR_FALSE);
else
shadowContext->Rectangle(shadowClipGfxRect);
shadowContext->SetFillRule(gfxContext::FILL_RULE_EVEN_ODD);
shadowContext->Fill();
blurringArea.DoPaint();
renderContext->Restore();
}
}
void
nsCSSRendering::PaintBackground(nsPresContext* aPresContext,
nsIRenderingContext& aRenderingContext,
nsIFrame* aForFrame,
const nsRect& aDirtyRect,
const nsRect& aBorderArea,
PRUint32 aFlags,
nsRect* aBGClipRect)
{
NS_PRECONDITION(aForFrame,
"Frame is expected to be provided to PaintBackground");
nsStyleContext *sc;
if (!FindBackground(aPresContext, aForFrame, &sc)) {
// We don't want to bail out if moz-appearance is set on a root
// node. If it has a parent content node, bail because it's not
// a root, other wise keep going in order to let the theme stuff
// draw the background. The canvas really should be drawing the
// bg, but there's no way to hook that up via css.
if (!aForFrame->GetStyleDisplay()->mAppearance) {
return;
}
nsIContent* content = aForFrame->GetContent();
if (!content || content->GetParent()) {
return;
}
sc = aForFrame->GetStyleContext();
}
PaintBackgroundWithSC(aPresContext, aRenderingContext, aForFrame,
aDirtyRect, aBorderArea, sc,
*aForFrame->GetStyleBorder(), aFlags,
aBGClipRect);
}
static PRBool
IsOpaqueBorderEdge(const nsStyleBorder& aBorder, mozilla::css::Side aSide)
{
if (aBorder.GetActualBorder().side(aSide) == 0)
return PR_TRUE;
switch (aBorder.GetBorderStyle(aSide)) {
case NS_STYLE_BORDER_STYLE_SOLID:
case NS_STYLE_BORDER_STYLE_GROOVE:
case NS_STYLE_BORDER_STYLE_RIDGE:
case NS_STYLE_BORDER_STYLE_INSET:
case NS_STYLE_BORDER_STYLE_OUTSET:
break;
default:
return PR_FALSE;
}
// If we're using a border image, assume it's not fully opaque,
// because we may not even have the image loaded at this point, and
// even if we did, checking whether the relevant tile is fully
// opaque would be too much work.
if (aBorder.GetBorderImage())
return PR_FALSE;
nscolor color;
PRBool isForeground;
aBorder.GetBorderColor(aSide, color, isForeground);
// We don't know the foreground color here, so if it's being used
// we must assume it might be transparent.
if (isForeground)
return PR_FALSE;
return NS_GET_A(color) == 255;
}
/**
* Returns true if all border edges are either missing or opaque.
*/
static PRBool
IsOpaqueBorder(const nsStyleBorder& aBorder)
{
if (aBorder.mBorderColors)
return PR_FALSE;
NS_FOR_CSS_SIDES(i) {
if (!IsOpaqueBorderEdge(aBorder, i))
return PR_FALSE;
}
return PR_TRUE;
}
static inline void
SetupDirtyRects(const nsRect& aBGClipArea, const nsRect& aCallerDirtyRect,
nscoord aAppUnitsPerPixel,
/* OUT: */
nsRect* aDirtyRect, gfxRect* aDirtyRectGfx)
{
aDirtyRect->IntersectRect(aBGClipArea, aCallerDirtyRect);
// Compute the Thebes equivalent of the dirtyRect.
*aDirtyRectGfx = nsLayoutUtils::RectToGfxRect(*aDirtyRect, aAppUnitsPerPixel);
NS_WARN_IF_FALSE(aDirtyRect->IsEmpty() || !aDirtyRectGfx->IsEmpty(),
"converted dirty rect should not be empty");
NS_ABORT_IF_FALSE(!aDirtyRect->IsEmpty() || aDirtyRectGfx->IsEmpty(),
"second should be empty if first is");
}
static void
SetupBackgroundClip(gfxContext *aCtx, PRUint8 aBackgroundClip,
nsIFrame* aForFrame, const nsRect& aBorderArea,
const nsRect& aCallerDirtyRect, PRBool aHaveRoundedCorners,
const gfxCornerSizes& aBGRadii, nscoord aAppUnitsPerPixel,
gfxContextAutoSaveRestore* aAutoSR,
/* OUT: */
nsRect* aBGClipArea, nsRect* aDirtyRect,
gfxRect* aDirtyRectGfx)
{
*aBGClipArea = aBorderArea;
PRBool radiiAreOuter = PR_TRUE;
gfxCornerSizes clippedRadii = aBGRadii;
if (aBackgroundClip != NS_STYLE_BG_CLIP_BORDER) {
nsMargin border = aForFrame->GetUsedBorder();
if (aBackgroundClip != NS_STYLE_BG_CLIP_PADDING) {
NS_ASSERTION(aBackgroundClip == NS_STYLE_BG_CLIP_CONTENT,
"unexpected background-clip");
border += aForFrame->GetUsedPadding();
}
aForFrame->ApplySkipSides(border);
aBGClipArea->Deflate(border);
if (aHaveRoundedCorners) {
gfxFloat borderSizes[4] = {
gfxFloat(border.top / aAppUnitsPerPixel),
gfxFloat(border.right / aAppUnitsPerPixel),
gfxFloat(border.bottom / aAppUnitsPerPixel),
gfxFloat(border.left / aAppUnitsPerPixel)
};
nsCSSBorderRenderer::ComputeInnerRadii(aBGRadii, borderSizes,
&clippedRadii);
radiiAreOuter = PR_FALSE;
}
}
SetupDirtyRects(*aBGClipArea, aCallerDirtyRect, aAppUnitsPerPixel,
aDirtyRect, aDirtyRectGfx);
if (aDirtyRectGfx->IsEmpty()) {
// Our caller won't draw anything under this condition, so no need
// to set more up.
return;
}
// If we have rounded corners, clip all subsequent drawing to the
// rounded rectangle defined by bgArea and bgRadii (we don't know
// whether the rounded corners intrude on the dirtyRect or not).
// Do not do this if we have a caller-provided clip rect --
// as above with bgArea, arguably a bug, but table painting seems
// to depend on it.
if (aHaveRoundedCorners) {
gfxRect bgAreaGfx =
nsLayoutUtils::RectToGfxRect(*aBGClipArea, aAppUnitsPerPixel);
bgAreaGfx.Round();
bgAreaGfx.Condition();
if (bgAreaGfx.IsEmpty()) {
// I think it's become possible to hit this since
// http://hg.mozilla.org/mozilla-central/rev/50e934e4979b landed.
NS_WARNING("converted background area should not be empty");
// Make our caller not do anything.
aDirtyRectGfx->size.SizeTo(0.0, 0.0);
return;
}
aAutoSR->Reset(aCtx);
aCtx->NewPath();
aCtx->RoundedRectangle(bgAreaGfx, clippedRadii, radiiAreOuter);
aCtx->Clip();
}
}
static nscolor
DetermineBackgroundColorInternal(nsPresContext* aPresContext,
nsStyleContext* aStyleContext,
nsIFrame* aFrame,
PRBool& aDrawBackgroundImage,
PRBool& aDrawBackgroundColor)
{
aDrawBackgroundImage = PR_TRUE;
aDrawBackgroundColor = PR_TRUE;
if (aFrame->HonorPrintBackgroundSettings()) {
aDrawBackgroundImage = aPresContext->GetBackgroundImageDraw();
aDrawBackgroundColor = aPresContext->GetBackgroundColorDraw();
}
nscolor bgColor;
if (aDrawBackgroundColor) {
bgColor =
aStyleContext->GetVisitedDependentColor(eCSSProperty_background_color);
if (NS_GET_A(bgColor) == 0)
aDrawBackgroundColor = PR_FALSE;
} else {
// If GetBackgroundColorDraw() is false, we are still expected to
// draw color in the background of any frame that's not completely
// transparent, but we are expected to use white instead of whatever
// color was specified.
bgColor = NS_RGB(255, 255, 255);
if (aDrawBackgroundImage ||
!aStyleContext->GetStyleBackground()->IsTransparent())
aDrawBackgroundColor = PR_TRUE;
else
bgColor = NS_RGBA(0,0,0,0);
}
return bgColor;
}
nscolor
nsCSSRendering::DetermineBackgroundColor(nsPresContext* aPresContext,
nsStyleContext* aStyleContext,
nsIFrame* aFrame)
{
PRBool drawBackgroundImage;
PRBool drawBackgroundColor;
return DetermineBackgroundColorInternal(aPresContext,
aStyleContext,
aFrame,
drawBackgroundImage,
drawBackgroundColor);
}
static gfxFloat
ConvertGradientValueToPixels(const nsStyleCoord& aCoord,
gfxFloat aFillLength,
PRInt32 aAppUnitsPerPixel)
{
switch (aCoord.GetUnit()) {
case eStyleUnit_Percent:
return aCoord.GetPercentValue() * aFillLength;
case eStyleUnit_Coord:
return NSAppUnitsToFloatPixels(aCoord.GetCoordValue(), aAppUnitsPerPixel);
default:
NS_WARNING("Unexpected coord unit");
return 0;
}
}
// Given a box with size aBoxSize and origin (0,0), and an angle aAngle,
// and a starting point for the gradient line aStart, find the endpoint of
// the gradient line --- the intersection of the gradient line with a line
// perpendicular to aAngle that passes through the farthest corner in the
// direction aAngle.
static gfxPoint
ComputeGradientLineEndFromAngle(const gfxPoint& aStart,
double aAngle,
const gfxSize& aBoxSize)
{
double dx = cos(-aAngle);
double dy = sin(-aAngle);
gfxPoint farthestCorner(dx > 0 ? aBoxSize.width : 0,
dy > 0 ? aBoxSize.height : 0);
gfxPoint delta = farthestCorner - aStart;
double u = delta.x*dy - delta.y*dx;
return farthestCorner + gfxPoint(-u*dy, u*dx);
}
// Compute the start and end points of the gradient line for a linear gradient.
static void
ComputeLinearGradientLine(nsPresContext* aPresContext,
nsStyleGradient* aGradient,
const gfxSize& aBoxSize,
gfxPoint* aLineStart,
gfxPoint* aLineEnd)
{
if (aGradient->mBgPosX.GetUnit() == eStyleUnit_None) {
double angle;
if (aGradient->mAngle.IsAngleValue()) {
angle = aGradient->mAngle.GetAngleValueInRadians();
} else {
angle = -M_PI_2; // defaults to vertical gradient starting from top
}
gfxPoint center(aBoxSize.width/2, aBoxSize.height/2);
*aLineEnd = ComputeGradientLineEndFromAngle(center, angle, aBoxSize);
*aLineStart = gfxPoint(aBoxSize.width, aBoxSize.height) - *aLineEnd;
} else {
PRInt32 appUnitsPerPixel = aPresContext->AppUnitsPerDevPixel();
*aLineStart = gfxPoint(
ConvertGradientValueToPixels(aGradient->mBgPosX, aBoxSize.width,
appUnitsPerPixel),
ConvertGradientValueToPixels(aGradient->mBgPosY, aBoxSize.height,
appUnitsPerPixel));
if (aGradient->mAngle.IsAngleValue()) {
double angle = aGradient->mAngle.GetAngleValueInRadians();
*aLineEnd = ComputeGradientLineEndFromAngle(*aLineStart, angle, aBoxSize);
} else {
// No angle, the line end is just the reflection of the start point
// through the center of the box
*aLineEnd = gfxPoint(aBoxSize.width, aBoxSize.height) - *aLineStart;
}
}
}
// Compute the start and end points of the gradient line for a radial gradient.
// Also returns the horizontal and vertical radii defining the circle or
// ellipse to use.
static void
ComputeRadialGradientLine(nsPresContext* aPresContext,
nsStyleGradient* aGradient,
const gfxSize& aBoxSize,
gfxPoint* aLineStart,
gfxPoint* aLineEnd,
double* aRadiusX,
double* aRadiusY)
{
if (aGradient->mBgPosX.GetUnit() == eStyleUnit_None) {
// Default line start point is the center of the box
*aLineStart = gfxPoint(aBoxSize.width/2, aBoxSize.height/2);
} else {
PRInt32 appUnitsPerPixel = aPresContext->AppUnitsPerDevPixel();
*aLineStart = gfxPoint(
ConvertGradientValueToPixels(aGradient->mBgPosX, aBoxSize.width,
appUnitsPerPixel),
ConvertGradientValueToPixels(aGradient->mBgPosY, aBoxSize.height,
appUnitsPerPixel));
}
// Compute gradient shape: the x and y radii of an ellipse.
double radiusX, radiusY;
double leftDistance = PR_ABS(aLineStart->x);
double rightDistance = PR_ABS(aBoxSize.width - aLineStart->x);
double topDistance = PR_ABS(aLineStart->y);
double bottomDistance = PR_ABS(aBoxSize.height - aLineStart->y);
switch (aGradient->mSize) {
case NS_STYLE_GRADIENT_SIZE_CLOSEST_SIDE:
radiusX = NS_MIN(leftDistance, rightDistance);
radiusY = NS_MIN(topDistance, bottomDistance);
if (aGradient->mShape == NS_STYLE_GRADIENT_SHAPE_CIRCULAR) {
radiusX = radiusY = NS_MIN(radiusX, radiusY);
}
break;
case NS_STYLE_GRADIENT_SIZE_CLOSEST_CORNER: {
// Compute x and y distances to nearest corner
double offsetX = NS_MIN(leftDistance, rightDistance);
double offsetY = NS_MIN(topDistance, bottomDistance);
if (aGradient->mShape == NS_STYLE_GRADIENT_SHAPE_CIRCULAR) {
radiusX = radiusY = NS_hypot(offsetX, offsetY);
} else {
// maintain aspect ratio
radiusX = offsetX*M_SQRT2;
radiusY = offsetY*M_SQRT2;
}
break;
}
case NS_STYLE_GRADIENT_SIZE_FARTHEST_SIDE:
radiusX = NS_MAX(leftDistance, rightDistance);
radiusY = NS_MAX(topDistance, bottomDistance);
if (aGradient->mShape == NS_STYLE_GRADIENT_SHAPE_CIRCULAR) {
radiusX = radiusY = NS_MAX(radiusX, radiusY);
}
break;
case NS_STYLE_GRADIENT_SIZE_FARTHEST_CORNER: {
// Compute x and y distances to nearest corner
double offsetX = NS_MAX(leftDistance, rightDistance);
double offsetY = NS_MAX(topDistance, bottomDistance);
if (aGradient->mShape == NS_STYLE_GRADIENT_SHAPE_CIRCULAR) {
radiusX = radiusY = NS_hypot(offsetX, offsetY);
} else {
// maintain aspect ratio
radiusX = offsetX*M_SQRT2;
radiusY = offsetY*M_SQRT2;
}
break;
}
default:
NS_ABORT_IF_FALSE(PR_FALSE, "unknown radial gradient sizing method");
}
*aRadiusX = radiusX;
*aRadiusY = radiusY;
double angle;
if (aGradient->mAngle.IsAngleValue()) {
angle = aGradient->mAngle.GetAngleValueInRadians();
} else {
// Default angle is 0deg
angle = 0.0;
}
// The gradient line end point is where the gradient line intersects
// the ellipse.
*aLineEnd = *aLineStart + gfxPoint(radiusX*cos(-angle), radiusY*sin(-angle));
}
// A resolved color stop --- with a specific position along the gradient line,
// and a Thebes color
struct ColorStop {
ColorStop(double aPosition, nscolor aColor) :
mPosition(aPosition), mColor(aColor) {}
double mPosition; // along the gradient line; 0=start, 1=end
gfxRGBA mColor;
};
// Returns aFrac*aC2 + (1 - aFrac)*C1. The interpolation is done
// in unpremultiplied space, which is what SVG gradients and cairo
// gradients expect.
static gfxRGBA
InterpolateColor(const gfxRGBA& aC1, const gfxRGBA& aC2, double aFrac)
{
double other = 1 - aFrac;
return gfxRGBA(aC2.r*aFrac + aC1.r*other,
aC2.g*aFrac + aC1.g*other,
aC2.b*aFrac + aC1.b*other,
aC2.a*aFrac + aC1.a*other);
}
static nscoord
FindTileStart(nscoord aDirtyCoord, nscoord aTilePos, nscoord aTileDim)
{
NS_ASSERTION(aTileDim > 0, "Non-positive tile dimension");
double multiples = NS_floor(double(aDirtyCoord - aTilePos)/aTileDim);
return NSToCoordRound(multiples*aTileDim + aTilePos);
}
void
nsCSSRendering::PaintGradient(nsPresContext* aPresContext,
nsIRenderingContext& aRenderingContext,
nsStyleGradient* aGradient,
const nsRect& aDirtyRect,
const nsRect& aOneCellArea,
const nsRect& aFillArea)
{
if (aOneCellArea.IsEmpty())
return;
gfxContext *ctx = aRenderingContext.ThebesContext();
nscoord appUnitsPerPixel = aPresContext->AppUnitsPerDevPixel();
gfxRect oneCellArea =
nsLayoutUtils::RectToGfxRect(aOneCellArea, appUnitsPerPixel);
// Compute "gradient line" start and end relative to oneCellArea
gfxPoint lineStart, lineEnd;
double radiusX = 0, radiusY = 0; // for radial gradients only
if (aGradient->mShape == NS_STYLE_GRADIENT_SHAPE_LINEAR) {
ComputeLinearGradientLine(aPresContext, aGradient, oneCellArea.size,
&lineStart, &lineEnd);
} else {
ComputeRadialGradientLine(aPresContext, aGradient, oneCellArea.size,
&lineStart, &lineEnd, &radiusX, &radiusY);
}
gfxFloat lineLength = NS_hypot(lineEnd.x - lineStart.x,
lineEnd.y - lineStart.y);
NS_ABORT_IF_FALSE(aGradient->mStops.Length() >= 2,
"The parser should reject gradients with less than two stops");
// Build color stop array and compute stop positions
nsTArray<ColorStop> stops;
// If there is a run of stops before stop i that did not have specified
// positions, then this is the index of the first stop in that run, otherwise
// it's -1.
PRInt32 firstUnsetPosition = -1;
for (PRUint32 i = 0; i < aGradient->mStops.Length(); ++i) {
const nsStyleGradientStop& stop = aGradient->mStops[i];
double position;
switch (stop.mLocation.GetUnit()) {
case eStyleUnit_None:
if (i == 0) {
// First stop defaults to position 0.0
position = 0.0;
} else if (i == aGradient->mStops.Length() - 1) {
// Last stop defaults to position 1.0
position = 1.0;
} else {
// Other stops with no specified position get their position assigned
// later by interpolation, see below.
// Remeber where the run of stops with no specified position starts,
// if it starts here.
if (firstUnsetPosition < 0) {
firstUnsetPosition = i;
}
stops.AppendElement(ColorStop(0, stop.mColor));
continue;
}
break;
case eStyleUnit_Percent:
position = stop.mLocation.GetPercentValue();
break;
case eStyleUnit_Coord:
position = lineLength < 1e-6 ? 0.0 :
stop.mLocation.GetCoordValue() / appUnitsPerPixel / lineLength;
break;
default:
NS_ABORT_IF_FALSE(PR_FALSE, "Unknown stop position type");
}
if (i > 0) {
// Prevent decreasing stop positions by advancing this position
// to the previous stop position, if necessary
position = NS_MAX(position, stops[i - 1].mPosition);
}
stops.AppendElement(ColorStop(position, stop.mColor));
if (firstUnsetPosition > 0) {
// Interpolate positions for all stops that didn't have a specified position
double p = stops[firstUnsetPosition - 1].mPosition;
double d = (stops[i].mPosition - p)/(i - firstUnsetPosition + 1);
for (PRUint32 j = firstUnsetPosition; j < i; ++j) {
p += d;
stops[j].mPosition = p;
}
firstUnsetPosition = -1;
}
}
// Eliminate negative-position stops if the gradient is radial.
double firstStop = stops[0].mPosition;
if (aGradient->mShape != NS_STYLE_GRADIENT_SHAPE_LINEAR && firstStop < 0.0) {
if (aGradient->mRepeating) {
// Choose an instance of the repeated pattern that gives us all positive
// stop-offsets.
double lastStop = stops[stops.Length() - 1].mPosition;
double stopDelta = lastStop - firstStop;
// If all the stops are in approximately the same place then logic below
// will kick in that makes us draw just the last stop color, so don't
// try to do anything in that case. We certainly need to avoid
// dividing by zero.
if (stopDelta >= 1e-6) {
double instanceCount = NS_ceil(-firstStop/stopDelta);
// Advance stops by instanceCount multiples of the period of the
// repeating gradient.
double offset = instanceCount*stopDelta;
for (PRUint32 i = 0; i < stops.Length(); i++) {
stops[i].mPosition += offset;
}
}
} else {
// Move negative-position stops to position 0.0. We may also need
// to set the color of the stop to the color the gradient should have
// at the center of the ellipse.
for (PRUint32 i = 0; i < stops.Length(); i++) {
double pos = stops[i].mPosition;
if (pos < 0.0) {
stops[i].mPosition = 0.0;
// If this is the last stop, we don't need to adjust the color,
// it will fill the entire area.
if (i < stops.Length() - 1) {
double nextPos = stops[i + 1].mPosition;
// If nextPos is approximately equal to pos, then we don't
// need to adjust the color of this stop because it's
// not going to be displayed.
// If nextPos is negative, we don't need to adjust the color of
// this stop since it's not going to be displayed because
// nextPos will also be moved to 0.0.
if (nextPos >= 0.0 && nextPos - pos >= 1e-6) {
// Compute how far the new position 0.0 is along the interval
// between pos and nextPos.
// XXX Color interpolation (in cairo, too) should use the
// CSS 'color-interpolation' property!
double frac = (0.0 - pos)/(nextPos - pos);
stops[i].mColor =
InterpolateColor(stops[i].mColor, stops[i + 1].mColor, frac);
}
}
}
}
}
firstStop = stops[0].mPosition;
NS_ABORT_IF_FALSE(firstStop >= 0.0, "Failed to fix stop offsets");
}
double lastStop = stops[stops.Length() - 1].mPosition;
// Cairo gradients must have stop positions in the range [0, 1]. So,
// stop positions will be normalized below by subtracting firstStop and then
// multiplying by stopScale.
double stopScale;
double stopDelta = lastStop - firstStop;
if (stopDelta < 1e-6 || lineLength < 1e-6 ||
(aGradient->mShape != NS_STYLE_GRADIENT_SHAPE_LINEAR &&
(radiusX < 1e-6 || radiusY < 1e-6))) {
// Stops are all at the same place. Map all stops to 0.0.
// For radial gradients we need to fill with the last stop color,
// so just set both radii to 0.
stopScale = 0.0;
radiusX = radiusY = 0.0;
lastStop = firstStop;
} else {
stopScale = 1.0/stopDelta;
}
// Create the gradient pattern.
nsRefPtr<gfxPattern> gradientPattern;
if (aGradient->mShape == NS_STYLE_GRADIENT_SHAPE_LINEAR) {
// Compute the actual gradient line ends we need to pass to cairo after
// stops have been normalized.
gfxPoint gradientStart = lineStart + (lineEnd - lineStart)*firstStop;
gfxPoint gradientEnd = lineStart + (lineEnd - lineStart)*lastStop;
if (stopScale == 0.0) {
// Stops are all at the same place. For repeating gradients, this will
// just paint the last stop color. We don't need to do anything.
// For non-repeating gradients, this should render as two colors, one
// on each "side" of the gradient line segment, which is a point. All
// our stops will be at 0.0; we just need to set the direction vector
// correctly.
gradientEnd = gradientStart + (lineEnd - lineStart);
}
gradientPattern = new gfxPattern(gradientStart.x, gradientStart.y,
gradientEnd.x, gradientEnd.y);
} else {
NS_ASSERTION(firstStop >= 0.0,
"Negative stops not allowed for radial gradients");
// To form an ellipse, we'll stretch a circle vertically, if necessary.
// So our radii are based on radiusX.
double innerRadius = radiusX*firstStop;
double outerRadius = radiusX*lastStop;
gradientPattern = new gfxPattern(lineStart.x, lineStart.y, innerRadius,
lineStart.x, lineStart.y, outerRadius);
if (gradientPattern && radiusX != radiusY) {
// Stretch the circles into ellipses vertically by setting a transform
// in the pattern.
// Recall that this is the transform from user space to pattern space.
// So to stretch the ellipse by factor of P vertically, we scale
// user coordinates by 1/P.
gfxMatrix matrix;
matrix.Translate(lineStart);
matrix.Scale(1.0, radiusX/radiusY);
matrix.Translate(-lineStart);
gradientPattern->SetMatrix(matrix);
}
}
if (!gradientPattern || gradientPattern->CairoStatus())
return;
// Now set normalized color stops in pattern.
if (stopScale == 0.0) {
// Non-repeating linear gradient with all stops in same place -> just add
// first stop and last stop, both at position 0.
// Repeating or radial gradient with all stops in the same place -> just
// paint the last stop color.
if (!aGradient->mRepeating &&
aGradient->mShape == NS_STYLE_GRADIENT_SHAPE_LINEAR) {
gradientPattern->AddColorStop(0.0, stops[0].mColor);
}
gradientPattern->AddColorStop(0.0, stops[stops.Length() - 1].mColor);
} else {
// Use all stops
for (PRUint32 i = 0; i < stops.Length(); i++) {
double pos = stopScale*(stops[i].mPosition - firstStop);
gradientPattern->AddColorStop(pos, stops[i].mColor);
}
}
// Set repeat mode. Default cairo extend mode is PAD.
if (aGradient->mRepeating) {
gradientPattern->SetExtend(gfxPattern::EXTEND_REPEAT);
}
// Paint gradient tiles. This isn't terribly efficient, but doing it this
// way is simple and sure to get pixel-snapping right. We could speed things
// up by drawing tiles into temporary surfaces and copying those to the
// destination, but after pixel-snapping tiles may not all be the same size.
nsRect dirty;
if (!dirty.IntersectRect(aDirtyRect, aFillArea))
return;
gfxRect areaToFill =
nsLayoutUtils::RectToGfxRect(aFillArea, appUnitsPerPixel);
gfxMatrix ctm = ctx->CurrentMatrix();
// xStart/yStart are the top-left corner of the top-left tile.
nscoord xStart = FindTileStart(dirty.x, aOneCellArea.x, aOneCellArea.width);
nscoord yStart = FindTileStart(dirty.y, aOneCellArea.y, aOneCellArea.height);
nscoord xEnd = dirty.XMost();
nscoord yEnd = dirty.YMost();
// x and y are the top-left corner of the tile to draw
for (nscoord y = yStart; y < yEnd; y += aOneCellArea.height) {
for (nscoord x = xStart; x < xEnd; x += aOneCellArea.width) {
// The coordinates of the tile
gfxRect tileRect = nsLayoutUtils::RectToGfxRect(
nsRect(x, y, aOneCellArea.width, aOneCellArea.height),
appUnitsPerPixel);
// The actual area to fill with this tile is the intersection of this
// tile with the overall area we're supposed to be filling
gfxRect fillRect = tileRect.Intersect(areaToFill);
ctx->NewPath();
ctx->Translate(tileRect.pos);
ctx->SetPattern(gradientPattern);
ctx->Rectangle(fillRect - tileRect.pos, PR_TRUE);
ctx->Fill();
ctx->SetMatrix(ctm);
}
}
}
void
nsCSSRendering::PaintBackgroundWithSC(nsPresContext* aPresContext,
nsIRenderingContext& aRenderingContext,
nsIFrame* aForFrame,
const nsRect& aDirtyRect,
const nsRect& aBorderArea,
nsStyleContext* aBackgroundSC,
const nsStyleBorder& aBorder,
PRUint32 aFlags,
nsRect* aBGClipRect)
{
NS_PRECONDITION(aForFrame,
"Frame is expected to be provided to PaintBackground");
// Check to see if we have an appearance defined. If so, we let the theme
// renderer draw the background and bail out.
// XXXzw this ignores aBGClipRect.
const nsStyleDisplay* displayData = aForFrame->GetStyleDisplay();
if (displayData->mAppearance) {
nsITheme *theme = aPresContext->GetTheme();
if (theme && theme->ThemeSupportsWidget(aPresContext, aForFrame,
displayData->mAppearance)) {
nsRect drawing(aBorderArea);
theme->GetWidgetOverflow(aPresContext->DeviceContext(),
aForFrame, displayData->mAppearance, &drawing);
drawing.IntersectRect(drawing, aDirtyRect);
theme->DrawWidgetBackground(&aRenderingContext, aForFrame,
displayData->mAppearance, aBorderArea,
drawing);
return;
}
}
// For canvas frames (in the CSS sense) we draw the background color using
// a solid color item that gets added in nsLayoutUtils::PaintFrame,
// or nsSubDocumentFrame::BuildDisplayList (bug 488242). (The solid
// color may be moved into nsDisplayCanvasBackground by
// nsPresShell::AddCanvasBackgroundColorItem, and painted by
// nsDisplayCanvasBackground directly.) Either way we don't need to
// paint the background color here.
PRBool isCanvasFrame = IsCanvasFrame(aForFrame);
// Determine whether we are drawing background images and/or
// background colors.
PRBool drawBackgroundImage;
PRBool drawBackgroundColor;
nscolor bgColor = DetermineBackgroundColorInternal(aPresContext,
aBackgroundSC,
aForFrame,
drawBackgroundImage,
drawBackgroundColor);
// At this point, drawBackgroundImage and drawBackgroundColor are
// true if and only if we are actually supposed to paint an image or
// color into aDirtyRect, respectively.
if (!drawBackgroundImage && !drawBackgroundColor)
return;
// Compute the outermost boundary of the area that might be painted.
gfxContext *ctx = aRenderingContext.ThebesContext();
nscoord appUnitsPerPixel = aPresContext->AppUnitsPerDevPixel();
// Same coordinate space as aBorderArea & aBGClipRect
gfxCornerSizes bgRadii;
PRBool haveRoundedCorners;
{
nscoord radii[8];
nsSize frameSize = aForFrame->GetSize();
if (&aBorder == aForFrame->GetStyleBorder() &&
frameSize == aBorderArea.Size()) {
haveRoundedCorners = aForFrame->GetBorderRadii(radii);
} else {
haveRoundedCorners = nsIFrame::ComputeBorderRadii(aBorder.mBorderRadius,
frameSize, aBorderArea.Size(),
aForFrame->GetSkipSides(), radii);
}
if (haveRoundedCorners)
ComputePixelRadii(radii, appUnitsPerPixel, &bgRadii);
}
// The 'bgClipArea' (used only by the image tiling logic, far below)
// is the caller-provided aBGClipRect if any, or else the area
// determined by the value of 'background-clip' in
// SetupCurrentBackgroundClip. (Arguably it should be the
// intersection, but that breaks the table painter -- in particular,
// taking the intersection breaks reftests/bugs/403249-1[ab].)
const nsStyleBackground *bg = aBackgroundSC->GetStyleBackground();
nsRect bgClipArea, dirtyRect;
gfxRect dirtyRectGfx;
PRUint8 currentBackgroundClip;
PRBool isSolidBorder;
gfxContextAutoSaveRestore autoSR;
if (aBGClipRect) {
bgClipArea = *aBGClipRect;
SetupDirtyRects(bgClipArea, aDirtyRect, appUnitsPerPixel,
&dirtyRect, &dirtyRectGfx);
} else {
// The background is rendered over the 'background-clip' area,
// which is normally equal to the border area but may be reduced
// to the padding area by CSS. Also, if the border is solid, we
// don't need to draw outside the padding area. In either case,
// if the borders are rounded, make sure we use the same inner
// radii as the border code will.
// The background-color is drawn based on the bottom
// background-clip.
currentBackgroundClip = bg->BottomLayer().mClip;
isSolidBorder =
(aFlags & PAINTBG_WILL_PAINT_BORDER) && IsOpaqueBorder(aBorder);
if (isSolidBorder)
currentBackgroundClip = NS_STYLE_BG_CLIP_PADDING;
SetupBackgroundClip(ctx, currentBackgroundClip, aForFrame,
aBorderArea, aDirtyRect, haveRoundedCorners,
bgRadii, appUnitsPerPixel, &autoSR,
&bgClipArea, &dirtyRect, &dirtyRectGfx);
}
// If we might be using a background color, go ahead and set it now.
if (drawBackgroundColor && !isCanvasFrame)
ctx->SetColor(gfxRGBA(bgColor));
// If there is no background image, draw a color. (If there is
// neither a background image nor a color, we wouldn't have gotten
// this far.)
if (!drawBackgroundImage) {
if (!dirtyRectGfx.IsEmpty() && !isCanvasFrame) {
ctx->NewPath();
ctx->Rectangle(dirtyRectGfx, PR_TRUE);
ctx->Fill();
}
return;
}
// Ensure we get invalidated for loads of the image. We need to do
// this here because this might be the only code that knows about the
// association of the style data with the frame.
aPresContext->SetupBackgroundImageLoaders(aForFrame, bg);
// We can skip painting the background color if a background image is opaque.
if (drawBackgroundColor &&
bg->BottomLayer().mRepeat == NS_STYLE_BG_REPEAT_XY &&
bg->BottomLayer().mImage.IsOpaque())
drawBackgroundColor = PR_FALSE;
// The background color is rendered over the entire dirty area,
// even if the image isn't.
if (drawBackgroundColor && !isCanvasFrame) {
if (!dirtyRectGfx.IsEmpty()) {
ctx->NewPath();
ctx->Rectangle(dirtyRectGfx, PR_TRUE);
ctx->Fill();
}
}
if (drawBackgroundImage) {
NS_FOR_VISIBLE_BACKGROUND_LAYERS_BACK_TO_FRONT(i, bg) {
const nsStyleBackground::Layer &layer = bg->mLayers[i];
if (!aBGClipRect) {
PRUint8 newBackgroundClip = layer.mClip;
if (isSolidBorder && newBackgroundClip == NS_STYLE_BG_CLIP_BORDER)
newBackgroundClip = NS_STYLE_BG_CLIP_PADDING;
if (currentBackgroundClip != newBackgroundClip) {
currentBackgroundClip = newBackgroundClip;
SetupBackgroundClip(ctx, currentBackgroundClip, aForFrame,
aBorderArea, aDirtyRect, haveRoundedCorners,
bgRadii, appUnitsPerPixel, &autoSR,
&bgClipArea, &dirtyRect, &dirtyRectGfx);
}
}
if (!dirtyRectGfx.IsEmpty()) {
PaintBackgroundLayer(aPresContext, aRenderingContext, aForFrame, aFlags,
dirtyRect, aBorderArea, bgClipArea, *bg,
layer);
}
}
}
}
static inline float
ScaleDimension(nsStyleBackground::Size::Dimension aDimension,
PRUint8 aType,
nscoord aLength, nscoord aAvailLength)
{
switch (aType) {
case nsStyleBackground::Size::ePercentage:
return double(aDimension.mFloat) * (double(aAvailLength) / double(aLength));
case nsStyleBackground::Size::eLength:
return double(aDimension.mCoord) / double(aLength);
default:
NS_ABORT_IF_FALSE(PR_FALSE, "bad aDimension.mType");
return 1.0f;
case nsStyleBackground::Size::eAuto:
NS_ABORT_IF_FALSE(PR_FALSE, "aDimension.mType == eAuto isn't handled");
return 1.0f;
}
}
static void
PaintBackgroundLayer(nsPresContext* aPresContext,
nsIRenderingContext& aRenderingContext,
nsIFrame* aForFrame,
PRUint32 aFlags,
const nsRect& aDirtyRect, // intersected with aBGClipRect
const nsRect& aBorderArea,
const nsRect& aBGClipRect,
const nsStyleBackground& aBackground,
const nsStyleBackground::Layer& aLayer)
{
/*
* The background properties we need to keep in mind when drawing background
* layers are:
*
* background-image
* background-repeat
* background-attachment
* background-position
* background-clip
* background-origin
* background-size
* background-break (-moz-background-inline-policy)
*
* (background-color applies to the entire element and not to individual
* layers, so it is irrelevant to this method.)
*
* These properties have the following dependencies upon each other when
* determining rendering:
*
* background-image
* no dependencies
* background-repeat
* no dependencies
* background-attachment
* no dependencies
* background-position
* depends upon background-size (for the image's scaled size) and
* background-break (for the background positioning area)
* background-clip
* no dependencies
* background-origin
* depends upon background-attachment (only in the case where that value
* is 'fixed')
* background-size
* depends upon background-break (for the background positioning area for
* resolving percentages), background-image (for the image's intrinsic
* size), background-repeat (if that value is 'round'), and
* background-origin (for the background painting area, when
* background-repeat is 'round')
* background-break
* depends upon background-origin (specifying how the boxes making up the
* background positioning area are determined)
*
* As a result of only-if dependencies we don't strictly do a topological
* sort of the above properties when processing, but it's pretty close to one:
*
* background-clip (by caller)
* background-image
* background-break, background-origin
* background-attachment (postfix for background-{origin,break} if 'fixed')
* background-size
* background-position
* background-repeat
*/
PRUint32 irFlags = 0;
if (aFlags & nsCSSRendering::PAINTBG_SYNC_DECODE_IMAGES)
irFlags |= ImageRenderer::FLAG_SYNC_DECODE_IMAGES;
ImageRenderer imageRenderer(aForFrame, &aLayer.mImage, irFlags);
if (!imageRenderer.PrepareImage()) {
// There's no image or it's not ready to be painted.
return;
}
// Compute background origin area relative to aBorderArea now as we may need
// it to compute the effective image size for a CSS gradient.
nsRect bgPositioningArea(0, 0, 0, 0);
nsIAtom* frameType = aForFrame->GetType();
nsIFrame* geometryFrame = aForFrame;
if (frameType == nsGkAtoms::inlineFrame ||
frameType == nsGkAtoms::positionedInlineFrame) {
// XXXjwalden Strictly speaking this is not quite faithful to how
// background-break is supposed to interact with background-origin values,
// but it's a non-trivial amount of work to make it fully conformant, and
// until the specification is more finalized (and assuming background-break
// even makes the cut) it doesn't make sense to hammer out exact behavior.
switch (aBackground.mBackgroundInlinePolicy) {
case NS_STYLE_BG_INLINE_POLICY_EACH_BOX:
bgPositioningArea = nsRect(nsPoint(0,0), aBorderArea.Size());
break;
case NS_STYLE_BG_INLINE_POLICY_BOUNDING_BOX:
bgPositioningArea = gInlineBGData->GetBoundingRect(aForFrame);
break;
default:
NS_ERROR("Unknown background-inline-policy value! "
"Please, teach me what to do.");
case NS_STYLE_BG_INLINE_POLICY_CONTINUOUS:
bgPositioningArea = gInlineBGData->GetContinuousRect(aForFrame);
break;
}
} else if (frameType == nsGkAtoms::canvasFrame) {
geometryFrame = aForFrame->GetFirstChild(nsnull);
// geometryFrame might be null if this canvas is a page created
// as an overflow container (e.g. the in-flow content has already
// finished and this page only displays the continuations of
// absolutely positioned content).
if (geometryFrame) {
bgPositioningArea = geometryFrame->GetRect();
}
} else {
bgPositioningArea = nsRect(nsPoint(0,0), aBorderArea.Size());
}
// Background images are tiled over the 'background-clip' area
// but the origin of the tiling is based on the 'background-origin' area
if (aLayer.mOrigin != NS_STYLE_BG_ORIGIN_BORDER && geometryFrame) {
nsMargin border = geometryFrame->GetUsedBorder();
if (aLayer.mOrigin != NS_STYLE_BG_ORIGIN_PADDING) {
border += geometryFrame->GetUsedPadding();
NS_ASSERTION(aLayer.mOrigin == NS_STYLE_BG_ORIGIN_CONTENT,
"unknown background-origin value");
}
geometryFrame->ApplySkipSides(border);
bgPositioningArea.Deflate(border);
}
// For background-attachment:fixed backgrounds, we'll limit the area
// where the background can be drawn to the viewport.
nsRect bgClipRect = aBGClipRect;
// Compute the anchor point.
//
// relative to aBorderArea.TopLeft() (which is where the top-left
// of aForFrame's border-box will be rendered)
nsPoint imageTopLeft, anchor;
if (NS_STYLE_BG_ATTACHMENT_FIXED == aLayer.mAttachment) {
aPresContext->SetHasFixedBackgroundFrame();
// If it's a fixed background attachment, then the image is placed
// relative to the viewport, which is the area of the root frame
// in a screen context or the page content frame in a print context.
nsIFrame* topFrame =
aPresContext->PresShell()->FrameManager()->GetRootFrame();
NS_ASSERTION(topFrame, "no root frame");
nsIFrame* pageContentFrame = nsnull;
if (aPresContext->IsPaginated()) {
pageContentFrame =
nsLayoutUtils::GetClosestFrameOfType(aForFrame, nsGkAtoms::pageContentFrame);
if (pageContentFrame) {
topFrame = pageContentFrame;
}
// else this is an embedded shell and its root frame is what we want
}
// Set the background positioning area to the viewport's area
// (relative to aForFrame)
bgPositioningArea = nsRect(-aForFrame->GetOffsetTo(topFrame), topFrame->GetSize());
if (!pageContentFrame) {
// Subtract the size of scrollbars.
nsIScrollableFrame* scrollableFrame =
aPresContext->PresShell()->GetRootScrollFrameAsScrollable();
if (scrollableFrame) {
nsMargin scrollbars = scrollableFrame->GetActualScrollbarSizes();
bgPositioningArea.Deflate(scrollbars);
}
}
if (aRenderingContext.ThebesContext()->GetFlags() &
gfxContext::FLAG_DESTINED_FOR_SCREEN) {
// Clip background-attachment:fixed backgrounds to the viewport, if we're
// painting to the screen. This avoids triggering tiling in common cases,
// without affecting output since drawing is always clipped to the viewport
// when we draw to the screen. (But it's not a pure optimization since it
// can affect the values of pixels at the edge of the viewport ---
// whether they're sampled from a putative "next tile" or not.)
bgClipRect.IntersectRect(bgClipRect, bgPositioningArea + aBorderArea.TopLeft());
}
}
nsSize imageSize = imageRenderer.ComputeSize(bgPositioningArea.Size());
if (imageSize.width <= 0 || imageSize.height <= 0)
return;
// Scale the image as specified for background-size and as required for
// proper background positioning when background-position is defined with
// percentages.
float scaleX, scaleY;
switch (aLayer.mSize.mWidthType) {
case nsStyleBackground::Size::eContain:
case nsStyleBackground::Size::eCover: {
float scaleFitX = double(bgPositioningArea.width) / imageSize.width;
float scaleFitY = double(bgPositioningArea.height) / imageSize.height;
if (aLayer.mSize.mWidthType == nsStyleBackground::Size::eCover) {
scaleX = scaleY = NS_MAX(scaleFitX, scaleFitY);
} else {
scaleX = scaleY = NS_MIN(scaleFitX, scaleFitY);
}
break;
}
default: {
if (aLayer.mSize.mWidthType == nsStyleBackground::Size::eAuto) {
if (aLayer.mSize.mHeightType == nsStyleBackground::Size::eAuto) {
scaleX = scaleY = 1.0f;
} else {
scaleX = scaleY =
ScaleDimension(aLayer.mSize.mHeight, aLayer.mSize.mHeightType,
imageSize.height, bgPositioningArea.height);
}
} else {
if (aLayer.mSize.mHeightType == nsStyleBackground::Size::eAuto) {
scaleX = scaleY =
ScaleDimension(aLayer.mSize.mWidth, aLayer.mSize.mWidthType,
imageSize.width, bgPositioningArea.width);
} else {
scaleX = ScaleDimension(aLayer.mSize.mWidth, aLayer.mSize.mWidthType,
imageSize.width, bgPositioningArea.width);
scaleY = ScaleDimension(aLayer.mSize.mHeight, aLayer.mSize.mHeightType,
imageSize.height, bgPositioningArea.height);
}
}
break;
}
}
imageSize.width = NSCoordSaturatingNonnegativeMultiply(imageSize.width, scaleX);
imageSize.height = NSCoordSaturatingNonnegativeMultiply(imageSize.height, scaleY);
// Compute the position of the background now that the background's size is
// determined.
ComputeBackgroundAnchorPoint(aLayer, bgPositioningArea.Size(), imageSize,
&imageTopLeft, &anchor);
imageTopLeft += bgPositioningArea.TopLeft();
anchor += bgPositioningArea.TopLeft();
nsRect destArea(imageTopLeft + aBorderArea.TopLeft(), imageSize);
nsRect fillArea = destArea;
PRIntn repeat = aLayer.mRepeat;
PR_STATIC_ASSERT(NS_STYLE_BG_REPEAT_XY ==
(NS_STYLE_BG_REPEAT_X | NS_STYLE_BG_REPEAT_Y));
if (repeat & NS_STYLE_BG_REPEAT_X) {
fillArea.x = bgClipRect.x;
fillArea.width = bgClipRect.width;
}
if (repeat & NS_STYLE_BG_REPEAT_Y) {
fillArea.y = bgClipRect.y;
fillArea.height = bgClipRect.height;
}
fillArea.IntersectRect(fillArea, bgClipRect);
imageRenderer.Draw(aPresContext, aRenderingContext, destArea, fillArea,
anchor + aBorderArea.TopLeft(), aDirtyRect);
}
static void
DrawBorderImage(nsPresContext* aPresContext,
nsIRenderingContext& aRenderingContext,
nsIFrame* aForFrame,
const nsRect& aBorderArea,
const nsStyleBorder& aStyleBorder,
const nsRect& aDirtyRect)
{
if (aDirtyRect.IsEmpty())
return;
// Ensure we get invalidated for loads and animations of the image.
// We need to do this here because this might be the only code that
// knows about the association of the style data with the frame.
// XXX We shouldn't really... since if anybody is passing in a
// different style, they'll potentially have the wrong size for the
// border too.
aPresContext->SetupBorderImageLoaders(aForFrame, &aStyleBorder);
imgIRequest *req = aStyleBorder.GetBorderImage();
#ifdef DEBUG
{
PRUint32 status = imgIRequest::STATUS_ERROR;
if (req)
req->GetImageStatus(&status);
NS_ASSERTION(req && (status & imgIRequest::STATUS_LOAD_COMPLETE),
"no image to draw");
}
#endif
// Get the actual image, and determine where the split points are.
// Note that mBorderImageSplit is in image pixels, not necessarily
// CSS pixels.
nsCOMPtr<imgIContainer> imgContainer;
req->GetImage(getter_AddRefs(imgContainer));
nsIntSize imageSize;
if (NS_FAILED(imgContainer->GetWidth(&imageSize.width))) {
imageSize.width =
nsPresContext::AppUnitsToIntCSSPixels(aBorderArea.width);
}
if (NS_FAILED(imgContainer->GetHeight(&imageSize.height))) {
imageSize.height =
nsPresContext::AppUnitsToIntCSSPixels(aBorderArea.height);
}
// Convert percentages and clamp values to the image size.
nsIntMargin split;
NS_FOR_CSS_SIDES(s) {
nsStyleCoord coord = aStyleBorder.mBorderImageSplit.Get(s);
PRInt32 imgDimension = ((s == NS_SIDE_TOP || s == NS_SIDE_BOTTOM)
? imageSize.height
: imageSize.width);
double value;
switch (coord.GetUnit()) {
case eStyleUnit_Percent:
value = coord.GetPercentValue() * imgDimension;
break;
case eStyleUnit_Factor:
value = coord.GetFactorValue();
break;
default:
NS_ASSERTION(coord.GetUnit() == eStyleUnit_Null,
"unexpected CSS unit for image split");
value = 0;
break;
}
if (value < 0)
value = 0;
if (value > imgDimension)
value = imgDimension;
split.side(s) = NS_lround(value);
}
nsMargin border(aStyleBorder.GetActualBorder());
// These helper tables recharacterize the 'split' and 'border' margins
// in a more convenient form: they are the x/y/width/height coords
// required for various bands of the border, and they have been transformed
// to be relative to the image (for 'split') or the page (for 'border').
enum {
LEFT, MIDDLE, RIGHT,
TOP = LEFT, BOTTOM = RIGHT
};
const nscoord borderX[3] = {
aBorderArea.x + 0,
aBorderArea.x + border.left,
aBorderArea.x + aBorderArea.width - border.right,
};
const nscoord borderY[3] = {
aBorderArea.y + 0,
aBorderArea.y + border.top,
aBorderArea.y + aBorderArea.height - border.bottom,
};
const nscoord borderWidth[3] = {
border.left,
aBorderArea.width - border.left - border.right,
border.right,
};
const nscoord borderHeight[3] = {
border.top,
aBorderArea.height - border.top - border.bottom,
border.bottom,
};
const PRInt32 splitX[3] = {
0,
split.left,
imageSize.width - split.right,
};
const PRInt32 splitY[3] = {
0,
split.top,
imageSize.height - split.bottom,
};
const PRInt32 splitWidth[3] = {
split.left,
imageSize.width - split.left - split.right,
split.right,
};
const PRInt32 splitHeight[3] = {
split.top,
imageSize.height - split.top - split.bottom,
split.bottom,
};
// In all the 'factor' calculations below, 'border' measurements are
// in app units but 'split' measurements are in image/CSS pixels, so
// the factor corresponding to no additional scaling is
// CSSPixelsToAppUnits(1), not simply 1.
for (int i = LEFT; i <= RIGHT; i++) {
for (int j = TOP; j <= BOTTOM; j++) {
nsRect destArea(borderX[i], borderY[j], borderWidth[i], borderHeight[j]);
nsIntRect subArea(splitX[i], splitY[j], splitWidth[i], splitHeight[j]);
PRUint8 fillStyleH, fillStyleV;
nsSize unitSize;
if (i == MIDDLE && j == MIDDLE) {
// css-background:
// The middle image's width is scaled by the same factor as the
// top image unless that factor is zero or infinity, in which
// case the scaling factor of the bottom is substituted, and
// failing that, the width is not scaled. The height of the
// middle image is scaled by the same factor as the left image
// unless that factor is zero or infinity, in which case the
// scaling factor of the right image is substituted, and failing
// that, the height is not scaled.
gfxFloat hFactor, vFactor;
if (0 < border.left && 0 < split.left)
vFactor = gfxFloat(border.left)/split.left;
else if (0 < border.right && 0 < split.right)
vFactor = gfxFloat(border.right)/split.right;
else
vFactor = nsPresContext::CSSPixelsToAppUnits(1);
if (0 < border.top && 0 < split.top)
hFactor = gfxFloat(border.top)/split.top;
else if (0 < border.bottom && 0 < split.bottom)
hFactor = gfxFloat(border.bottom)/split.bottom;
else
hFactor = nsPresContext::CSSPixelsToAppUnits(1);
unitSize.width = splitWidth[i]*hFactor;
unitSize.height = splitHeight[j]*vFactor;
fillStyleH = aStyleBorder.mBorderImageHFill;
fillStyleV = aStyleBorder.mBorderImageVFill;
} else if (i == MIDDLE) { // top, bottom
// Sides are always stretched to the thickness of their border,
// and stretched proportionately on the other axis.
gfxFloat factor;
if (0 < borderHeight[j] && 0 < splitHeight[j])
factor = gfxFloat(borderHeight[j])/splitHeight[j];
else
factor = nsPresContext::CSSPixelsToAppUnits(1);
unitSize.width = splitWidth[i]*factor;
unitSize.height = borderHeight[j];
fillStyleH = aStyleBorder.mBorderImageHFill;
fillStyleV = NS_STYLE_BORDER_IMAGE_STRETCH;
} else if (j == MIDDLE) { // left, right
gfxFloat factor;
if (0 < borderWidth[i] && 0 < splitWidth[i])
factor = gfxFloat(borderWidth[i])/splitWidth[i];
else
factor = nsPresContext::CSSPixelsToAppUnits(1);
unitSize.width = borderWidth[i];
unitSize.height = splitHeight[j]*factor;
fillStyleH = NS_STYLE_BORDER_IMAGE_STRETCH;
fillStyleV = aStyleBorder.mBorderImageVFill;
} else {
// Corners are always stretched to fit the corner.
unitSize.width = borderWidth[i];
unitSize.height = borderHeight[j];
fillStyleH = NS_STYLE_BORDER_IMAGE_STRETCH;
fillStyleV = NS_STYLE_BORDER_IMAGE_STRETCH;
}
DrawBorderImageComponent(aRenderingContext, aForFrame,
imgContainer, aDirtyRect,
destArea, subArea,
fillStyleH, fillStyleV,
unitSize, aStyleBorder, i * (RIGHT + 1) + j);
}
}
}
static void
DrawBorderImageComponent(nsIRenderingContext& aRenderingContext,
nsIFrame* aForFrame,
imgIContainer* aImage,
const nsRect& aDirtyRect,
const nsRect& aFill,
const nsIntRect& aSrc,
PRUint8 aHFill,
PRUint8 aVFill,
const nsSize& aUnitSize,
const nsStyleBorder& aStyleBorder,
PRUint8 aIndex)
{
if (aFill.IsEmpty() || aSrc.IsEmpty())
return;
// Don't bother trying to cache sub images if the border image is animated
// We can only sucessfully call GetAnimated() if we are fully decoded, so default to PR_TRUE
PRBool animated = PR_TRUE;
aImage->GetAnimated(&animated);
nsCOMPtr<imgIContainer> subImage;
if (animated || (subImage = aStyleBorder.GetSubImage(aIndex)) == 0) {
if (NS_FAILED(aImage->ExtractFrame(imgIContainer::FRAME_CURRENT, aSrc,
imgIContainer::FLAG_SYNC_DECODE,
getter_AddRefs(subImage))))
return;
if (!animated)
aStyleBorder.SetSubImage(aIndex, subImage);
}
gfxPattern::GraphicsFilter graphicsFilter =
nsLayoutUtils::GetGraphicsFilterForFrame(aForFrame);
// If we have no tiling in either direction, we can skip the intermediate
// scaling step.
if ((aHFill == NS_STYLE_BORDER_IMAGE_STRETCH &&
aVFill == NS_STYLE_BORDER_IMAGE_STRETCH) ||
(aUnitSize.width == aFill.width &&
aUnitSize.height == aFill.height)) {
nsLayoutUtils::DrawSingleImage(&aRenderingContext, subImage,
graphicsFilter,
aFill, aDirtyRect, imgIContainer::FLAG_NONE);
return;
}
// Compute the scale and position of the master copy of the image.
nsRect tile;
switch (aHFill) {
case NS_STYLE_BORDER_IMAGE_STRETCH:
tile.x = aFill.x;
tile.width = aFill.width;
break;
case NS_STYLE_BORDER_IMAGE_REPEAT:
tile.x = aFill.x + aFill.width/2 - aUnitSize.width/2;
tile.width = aUnitSize.width;
break;
case NS_STYLE_BORDER_IMAGE_ROUND:
tile.x = aFill.x;
tile.width = aFill.width / ceil(gfxFloat(aFill.width)/aUnitSize.width);
break;
default:
NS_NOTREACHED("unrecognized border-image fill style");
}
switch (aVFill) {
case NS_STYLE_BORDER_IMAGE_STRETCH:
tile.y = aFill.y;
tile.height = aFill.height;
break;
case NS_STYLE_BORDER_IMAGE_REPEAT:
tile.y = aFill.y + aFill.height/2 - aUnitSize.height/2;
tile.height = aUnitSize.height;
break;
case NS_STYLE_BORDER_IMAGE_ROUND:
tile.y = aFill.y;
tile.height = aFill.height/ceil(gfxFloat(aFill.height)/aUnitSize.height);
break;
default:
NS_NOTREACHED("unrecognized border-image fill style");
}
nsLayoutUtils::DrawImage(&aRenderingContext, subImage, graphicsFilter,
tile, aFill, tile.TopLeft(), aDirtyRect,
imgIContainer::FLAG_NONE);
}
// Begin table border-collapsing section
// These functions were written to not disrupt the normal ones and yet satisfy some additional requirements
// At some point, all functions should be unified to include the additional functionality that these provide
static nscoord
RoundIntToPixel(nscoord aValue,
nscoord aTwipsPerPixel,
PRBool aRoundDown = PR_FALSE)
{
if (aTwipsPerPixel <= 0)
// We must be rendering to a device that has a resolution greater than Twips!
// In that case, aValue is as accurate as it's going to get.
return aValue;
nscoord halfPixel = NSToCoordRound(aTwipsPerPixel / 2.0f);
nscoord extra = aValue % aTwipsPerPixel;
nscoord finalValue = (!aRoundDown && (extra >= halfPixel)) ? aValue + (aTwipsPerPixel - extra) : aValue - extra;
return finalValue;
}
static nscoord
RoundFloatToPixel(float aValue,
nscoord aTwipsPerPixel,
PRBool aRoundDown = PR_FALSE)
{
return RoundIntToPixel(NSToCoordRound(aValue), aTwipsPerPixel, aRoundDown);
}
static void
SetPoly(const nsRect& aRect,
nsPoint* poly)
{
poly[0].x = aRect.x;
poly[0].y = aRect.y;
poly[1].x = aRect.x + aRect.width;
poly[1].y = aRect.y;
poly[2].x = aRect.x + aRect.width;
poly[2].y = aRect.y + aRect.height;
poly[3].x = aRect.x;
poly[3].y = aRect.y + aRect.height;
poly[4].x = aRect.x;
poly[4].y = aRect.y;
}
static void
DrawSolidBorderSegment(nsIRenderingContext& aContext,
nsRect aRect,
nscoord aTwipsPerPixel,
PRUint8 aStartBevelSide = 0,
nscoord aStartBevelOffset = 0,
PRUint8 aEndBevelSide = 0,
nscoord aEndBevelOffset = 0)
{
if ((aRect.width == aTwipsPerPixel) || (aRect.height == aTwipsPerPixel) ||
((0 == aStartBevelOffset) && (0 == aEndBevelOffset))) {
// simple line or rectangle
if ((NS_SIDE_TOP == aStartBevelSide) || (NS_SIDE_BOTTOM == aStartBevelSide)) {
if (1 == aRect.height)
aContext.DrawLine(aRect.x, aRect.y, aRect.x, aRect.y + aRect.height);
else
aContext.FillRect(aRect);
}
else {
if (1 == aRect.width)
aContext.DrawLine(aRect.x, aRect.y, aRect.x + aRect.width, aRect.y);
else
aContext.FillRect(aRect);
}
}
else {
// polygon with beveling
nsPoint poly[5];
SetPoly(aRect, poly);
switch(aStartBevelSide) {
case NS_SIDE_TOP:
poly[0].x += aStartBevelOffset;
poly[4].x = poly[0].x;
break;
case NS_SIDE_BOTTOM:
poly[3].x += aStartBevelOffset;
break;
case NS_SIDE_RIGHT:
poly[1].y += aStartBevelOffset;
break;
case NS_SIDE_LEFT:
poly[0].y += aStartBevelOffset;
poly[4].y = poly[0].y;
}
switch(aEndBevelSide) {
case NS_SIDE_TOP:
poly[1].x -= aEndBevelOffset;
break;
case NS_SIDE_BOTTOM:
poly[2].x -= aEndBevelOffset;
break;
case NS_SIDE_RIGHT:
poly[2].y -= aEndBevelOffset;
break;
case NS_SIDE_LEFT:
poly[3].y -= aEndBevelOffset;
}
aContext.FillPolygon(poly, 5);
}
}
static void
GetDashInfo(nscoord aBorderLength,
nscoord aDashLength,
nscoord aTwipsPerPixel,
PRInt32& aNumDashSpaces,
nscoord& aStartDashLength,
nscoord& aEndDashLength)
{
aNumDashSpaces = 0;
if (aStartDashLength + aDashLength + aEndDashLength >= aBorderLength) {
aStartDashLength = aBorderLength;
aEndDashLength = 0;
}
else {
aNumDashSpaces = (aBorderLength - aDashLength)/ (2 * aDashLength); // round down
nscoord extra = aBorderLength - aStartDashLength - aEndDashLength - (((2 * aNumDashSpaces) - 1) * aDashLength);
if (extra > 0) {
nscoord half = RoundIntToPixel(extra / 2, aTwipsPerPixel);
aStartDashLength += half;
aEndDashLength += (extra - half);
}
}
}
void
nsCSSRendering::DrawTableBorderSegment(nsIRenderingContext& aContext,
PRUint8 aBorderStyle,
nscolor aBorderColor,
const nsStyleBackground* aBGColor,
const nsRect& aBorder,
PRInt32 aAppUnitsPerCSSPixel,
PRUint8 aStartBevelSide,
nscoord aStartBevelOffset,
PRUint8 aEndBevelSide,
nscoord aEndBevelOffset)
{
aContext.SetColor (aBorderColor);
PRBool horizontal = ((NS_SIDE_TOP == aStartBevelSide) || (NS_SIDE_BOTTOM == aStartBevelSide));
nscoord twipsPerPixel = NSIntPixelsToAppUnits(1, aAppUnitsPerCSSPixel);
PRUint8 ridgeGroove = NS_STYLE_BORDER_STYLE_RIDGE;
if ((twipsPerPixel >= aBorder.width) || (twipsPerPixel >= aBorder.height) ||
(NS_STYLE_BORDER_STYLE_DASHED == aBorderStyle) || (NS_STYLE_BORDER_STYLE_DOTTED == aBorderStyle)) {
// no beveling for 1 pixel border, dash or dot
aStartBevelOffset = 0;
aEndBevelOffset = 0;
}
gfxContext *ctx = aContext.ThebesContext();
gfxContext::AntialiasMode oldMode = ctx->CurrentAntialiasMode();
ctx->SetAntialiasMode(gfxContext::MODE_ALIASED);
switch (aBorderStyle) {
case NS_STYLE_BORDER_STYLE_NONE:
case NS_STYLE_BORDER_STYLE_HIDDEN:
//NS_ASSERTION(PR_FALSE, "style of none or hidden");
break;
case NS_STYLE_BORDER_STYLE_DOTTED:
case NS_STYLE_BORDER_STYLE_DASHED:
{
nscoord dashLength = (NS_STYLE_BORDER_STYLE_DASHED == aBorderStyle) ? DASH_LENGTH : DOT_LENGTH;
// make the dash length proportional to the border thickness
dashLength *= (horizontal) ? aBorder.height : aBorder.width;
// make the min dash length for the ends 1/2 the dash length
nscoord minDashLength = (NS_STYLE_BORDER_STYLE_DASHED == aBorderStyle)
? RoundFloatToPixel(((float)dashLength) / 2.0f, twipsPerPixel) : dashLength;
minDashLength = NS_MAX(minDashLength, twipsPerPixel);
nscoord numDashSpaces = 0;
nscoord startDashLength = minDashLength;
nscoord endDashLength = minDashLength;
if (horizontal) {
GetDashInfo(aBorder.width, dashLength, twipsPerPixel, numDashSpaces, startDashLength, endDashLength);
nsRect rect(aBorder.x, aBorder.y, startDashLength, aBorder.height);
DrawSolidBorderSegment(aContext, rect, twipsPerPixel);
for (PRInt32 spaceX = 0; spaceX < numDashSpaces; spaceX++) {
rect.x += rect.width + dashLength;
rect.width = (spaceX == (numDashSpaces - 1)) ? endDashLength : dashLength;
DrawSolidBorderSegment(aContext, rect, twipsPerPixel);
}
}
else {
GetDashInfo(aBorder.height, dashLength, twipsPerPixel, numDashSpaces, startDashLength, endDashLength);
nsRect rect(aBorder.x, aBorder.y, aBorder.width, startDashLength);
DrawSolidBorderSegment(aContext, rect, twipsPerPixel);
for (PRInt32 spaceY = 0; spaceY < numDashSpaces; spaceY++) {
rect.y += rect.height + dashLength;
rect.height = (spaceY == (numDashSpaces - 1)) ? endDashLength : dashLength;
DrawSolidBorderSegment(aContext, rect, twipsPerPixel);
}
}
}
break;
case NS_STYLE_BORDER_STYLE_GROOVE:
ridgeGroove = NS_STYLE_BORDER_STYLE_GROOVE; // and fall through to ridge
case NS_STYLE_BORDER_STYLE_RIDGE:
if ((horizontal && (twipsPerPixel >= aBorder.height)) ||
(!horizontal && (twipsPerPixel >= aBorder.width))) {
// a one pixel border
DrawSolidBorderSegment(aContext, aBorder, twipsPerPixel, aStartBevelSide, aStartBevelOffset,
aEndBevelSide, aEndBevelOffset);
}
else {
nscoord startBevel = (aStartBevelOffset > 0)
? RoundFloatToPixel(0.5f * (float)aStartBevelOffset, twipsPerPixel, PR_TRUE) : 0;
nscoord endBevel = (aEndBevelOffset > 0)
? RoundFloatToPixel(0.5f * (float)aEndBevelOffset, twipsPerPixel, PR_TRUE) : 0;
mozilla::css::Side ridgeGrooveSide = (horizontal) ? NS_SIDE_TOP : NS_SIDE_LEFT;
// FIXME: In theory, this should use the visited-dependent
// background color, but I don't care.
aContext.SetColor (
MakeBevelColor(ridgeGrooveSide, ridgeGroove, aBGColor->mBackgroundColor, aBorderColor));
nsRect rect(aBorder);
nscoord half;
if (horizontal) { // top, bottom
half = RoundFloatToPixel(0.5f * (float)aBorder.height, twipsPerPixel);
rect.height = half;
if (NS_SIDE_TOP == aStartBevelSide) {
rect.x += startBevel;
rect.width -= startBevel;
}
if (NS_SIDE_TOP == aEndBevelSide) {
rect.width -= endBevel;
}
DrawSolidBorderSegment(aContext, rect, twipsPerPixel, aStartBevelSide,
startBevel, aEndBevelSide, endBevel);
}
else { // left, right
half = RoundFloatToPixel(0.5f * (float)aBorder.width, twipsPerPixel);
rect.width = half;
if (NS_SIDE_LEFT == aStartBevelSide) {
rect.y += startBevel;
rect.height -= startBevel;
}
if (NS_SIDE_LEFT == aEndBevelSide) {
rect.height -= endBevel;
}
DrawSolidBorderSegment(aContext, rect, twipsPerPixel, aStartBevelSide,
startBevel, aEndBevelSide, endBevel);
}
rect = aBorder;
ridgeGrooveSide = (NS_SIDE_TOP == ridgeGrooveSide) ? NS_SIDE_BOTTOM : NS_SIDE_RIGHT;
// FIXME: In theory, this should use the visited-dependent
// background color, but I don't care.
aContext.SetColor (
MakeBevelColor(ridgeGrooveSide, ridgeGroove, aBGColor->mBackgroundColor, aBorderColor));
if (horizontal) {
rect.y = rect.y + half;
rect.height = aBorder.height - half;
if (NS_SIDE_BOTTOM == aStartBevelSide) {
rect.x += startBevel;
rect.width -= startBevel;
}
if (NS_SIDE_BOTTOM == aEndBevelSide) {
rect.width -= endBevel;
}
DrawSolidBorderSegment(aContext, rect, twipsPerPixel, aStartBevelSide,
startBevel, aEndBevelSide, endBevel);
}
else {
rect.x = rect.x + half;
rect.width = aBorder.width - half;
if (NS_SIDE_RIGHT == aStartBevelSide) {
rect.y += aStartBevelOffset - startBevel;
rect.height -= startBevel;
}
if (NS_SIDE_RIGHT == aEndBevelSide) {
rect.height -= endBevel;
}
DrawSolidBorderSegment(aContext, rect, twipsPerPixel, aStartBevelSide,
startBevel, aEndBevelSide, endBevel);
}
}
break;
case NS_STYLE_BORDER_STYLE_DOUBLE:
if ((aBorder.width > 2) && (aBorder.height > 2)) {
nscoord startBevel = (aStartBevelOffset > 0)
? RoundFloatToPixel(0.333333f * (float)aStartBevelOffset, twipsPerPixel) : 0;
nscoord endBevel = (aEndBevelOffset > 0)
? RoundFloatToPixel(0.333333f * (float)aEndBevelOffset, twipsPerPixel) : 0;
if (horizontal) { // top, bottom
nscoord thirdHeight = RoundFloatToPixel(0.333333f * (float)aBorder.height, twipsPerPixel);
// draw the top line or rect
nsRect topRect(aBorder.x, aBorder.y, aBorder.width, thirdHeight);
if (NS_SIDE_TOP == aStartBevelSide) {
topRect.x += aStartBevelOffset - startBevel;
topRect.width -= aStartBevelOffset - startBevel;
}
if (NS_SIDE_TOP == aEndBevelSide) {
topRect.width -= aEndBevelOffset - endBevel;
}
DrawSolidBorderSegment(aContext, topRect, twipsPerPixel, aStartBevelSide,
startBevel, aEndBevelSide, endBevel);
// draw the botom line or rect
nscoord heightOffset = aBorder.height - thirdHeight;
nsRect bottomRect(aBorder.x, aBorder.y + heightOffset, aBorder.width, aBorder.height - heightOffset);
if (NS_SIDE_BOTTOM == aStartBevelSide) {
bottomRect.x += aStartBevelOffset - startBevel;
bottomRect.width -= aStartBevelOffset - startBevel;
}
if (NS_SIDE_BOTTOM == aEndBevelSide) {
bottomRect.width -= aEndBevelOffset - endBevel;
}
DrawSolidBorderSegment(aContext, bottomRect, twipsPerPixel, aStartBevelSide,
startBevel, aEndBevelSide, endBevel);
}
else { // left, right
nscoord thirdWidth = RoundFloatToPixel(0.333333f * (float)aBorder.width, twipsPerPixel);
nsRect leftRect(aBorder.x, aBorder.y, thirdWidth, aBorder.height);
if (NS_SIDE_LEFT == aStartBevelSide) {
leftRect.y += aStartBevelOffset - startBevel;
leftRect.height -= aStartBevelOffset - startBevel;
}
if (NS_SIDE_LEFT == aEndBevelSide) {
leftRect.height -= aEndBevelOffset - endBevel;
}
DrawSolidBorderSegment(aContext, leftRect, twipsPerPixel, aStartBevelSide,
startBevel, aEndBevelSide, endBevel);
nscoord widthOffset = aBorder.width - thirdWidth;
nsRect rightRect(aBorder.x + widthOffset, aBorder.y, aBorder.width - widthOffset, aBorder.height);
if (NS_SIDE_RIGHT == aStartBevelSide) {
rightRect.y += aStartBevelOffset - startBevel;
rightRect.height -= aStartBevelOffset - startBevel;
}
if (NS_SIDE_RIGHT == aEndBevelSide) {
rightRect.height -= aEndBevelOffset - endBevel;
}
DrawSolidBorderSegment(aContext, rightRect, twipsPerPixel, aStartBevelSide,
startBevel, aEndBevelSide, endBevel);
}
break;
}
// else fall through to solid
case NS_STYLE_BORDER_STYLE_SOLID:
DrawSolidBorderSegment(aContext, aBorder, twipsPerPixel, aStartBevelSide,
aStartBevelOffset, aEndBevelSide, aEndBevelOffset);
break;
case NS_STYLE_BORDER_STYLE_OUTSET:
case NS_STYLE_BORDER_STYLE_INSET:
NS_ASSERTION(PR_FALSE, "inset, outset should have been converted to groove, ridge");
break;
case NS_STYLE_BORDER_STYLE_AUTO:
NS_ASSERTION(PR_FALSE, "Unexpected 'auto' table border");
break;
}
ctx->SetAntialiasMode(oldMode);
}
// End table border-collapsing section
void
nsCSSRendering::PaintDecorationLine(gfxContext* aGfxContext,
const nscolor aColor,
const gfxPoint& aPt,
const gfxSize& aLineSize,
const gfxFloat aAscent,
const gfxFloat aOffset,
const PRUint8 aDecoration,
const PRUint8 aStyle,
const gfxFloat aDescentLimit)
{
NS_ASSERTION(aStyle != DECORATION_STYLE_NONE, "aStyle is none");
gfxRect rect =
GetTextDecorationRectInternal(aPt, aLineSize, aAscent, aOffset,
aDecoration, aStyle, aDescentLimit);
if (rect.IsEmpty())
return;
if (aDecoration != NS_STYLE_TEXT_DECORATION_UNDERLINE &&
aDecoration != NS_STYLE_TEXT_DECORATION_OVERLINE &&
aDecoration != NS_STYLE_TEXT_DECORATION_LINE_THROUGH)
{
NS_ERROR("Invalid decoration value!");
return;
}
gfxFloat lineHeight = NS_MAX(NS_round(aLineSize.height), 1.0);
PRBool contextIsSaved = PR_FALSE;
gfxFloat oldLineWidth;
nsRefPtr<gfxPattern> oldPattern;
switch (aStyle) {
case DECORATION_STYLE_SOLID:
case DECORATION_STYLE_DOUBLE:
oldLineWidth = aGfxContext->CurrentLineWidth();
oldPattern = aGfxContext->GetPattern();
break;
case DECORATION_STYLE_DASHED: {
aGfxContext->Save();
contextIsSaved = PR_TRUE;
aGfxContext->Clip(rect);
gfxFloat dashWidth = lineHeight * DOT_LENGTH * DASH_LENGTH;
gfxFloat dash[2] = { dashWidth, dashWidth };
aGfxContext->SetLineCap(gfxContext::LINE_CAP_BUTT);
aGfxContext->SetDash(dash, 2, 0.0);
// We should continue to draw the last dash even if it is not in the rect.
rect.size.width += dashWidth;
break;
}
case DECORATION_STYLE_DOTTED: {
aGfxContext->Save();
contextIsSaved = PR_TRUE;
aGfxContext->Clip(rect);
gfxFloat dashWidth = lineHeight * DOT_LENGTH;
gfxFloat dash[2];
if (lineHeight > 2.0) {
dash[0] = 0.0;
dash[1] = dashWidth * 2.0;
aGfxContext->SetLineCap(gfxContext::LINE_CAP_ROUND);
} else {
dash[0] = dashWidth;
dash[1] = dashWidth;
}
aGfxContext->SetDash(dash, 2, 0.0);
// We should continue to draw the last dot even if it is not in the rect.
rect.size.width += dashWidth;
break;
}
case DECORATION_STYLE_WAVY:
aGfxContext->Save();
contextIsSaved = PR_TRUE;
aGfxContext->Clip(rect);
if (lineHeight > 2.0) {
aGfxContext->SetAntialiasMode(gfxContext::MODE_COVERAGE);
} else {
// Don't use anti-aliasing here. Because looks like lighter color wavy
// line at this case. And probably, users don't think the
// non-anti-aliased wavy line is not pretty.
aGfxContext->SetAntialiasMode(gfxContext::MODE_ALIASED);
}
break;
default:
NS_ERROR("Invalid style value!");
return;
}
// The y position should be set to the middle of the line.
rect.pos.y += lineHeight / 2;
aGfxContext->SetColor(gfxRGBA(aColor));
aGfxContext->SetLineWidth(lineHeight);
switch (aStyle) {
case DECORATION_STYLE_SOLID:
aGfxContext->NewPath();
aGfxContext->MoveTo(rect.TopLeft());
aGfxContext->LineTo(rect.TopRight());
aGfxContext->Stroke();
break;
case DECORATION_STYLE_DOUBLE:
/**
* We are drawing double line as:
*
* +-------------------------------------------+
* |XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX| ^
* |XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX| | lineHeight
* |XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX| v
* | |
* | |
* |XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX| ^
* |XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX| | lineHeight
* |XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX| v
* +-------------------------------------------+
*/
aGfxContext->NewPath();
aGfxContext->MoveTo(rect.TopLeft());
aGfxContext->LineTo(rect.TopRight());
rect.size.height -= lineHeight;
aGfxContext->MoveTo(rect.BottomLeft());
aGfxContext->LineTo(rect.BottomRight());
aGfxContext->Stroke();
break;
case DECORATION_STYLE_DOTTED:
case DECORATION_STYLE_DASHED:
aGfxContext->NewPath();
aGfxContext->MoveTo(rect.TopLeft());
aGfxContext->LineTo(rect.TopRight());
aGfxContext->Stroke();
break;
case DECORATION_STYLE_WAVY: {
/**
* We are drawing wavy line as:
*
* P: Path, X: Painted pixel
*
* +---------------------------------------+
* XX|X XXXXXX XXXXXX |
* PP|PX XPPPPPPX XPPPPPPX | ^
* XX|XPX XPXXXXXXPX XPXXXXXXPX| |
* | XPX XPX XPX XPX XP|X |adv
* | XPXXXXXXPX XPXXXXXXPX X|PX |
* | XPPPPPPX XPPPPPPX |XPX v
* | XXXXXX XXXXXX | XX
* +---------------------------------------+
* <---><---> ^
* adv flatLengthAtVertex rightMost
*
* 1. Always starts from top-left of the drawing area, however, we need
* to draw the line from outside of the rect. Because the start
* point of the line is not good style if we draw from inside it.
* 2. First, draw horizontal line from outside the rect to top-left of
* the rect;
* 3. Goes down to bottom of the area at 45 degrees.
* 4. Slides to right horizontaly, see |flatLengthAtVertex|.
* 5. Goes up to top of the area at 45 degrees.
* 6. Slides to right horizontaly.
* 7. Repeat from 2 until reached to right-most edge of the area.
*/
rect.pos.x += lineHeight / 2.0;
aGfxContext->NewPath();
gfxPoint pt(rect.pos);
gfxFloat rightMost = pt.x + rect.Width() + lineHeight;
gfxFloat adv = rect.Height() - lineHeight;
gfxFloat flatLengthAtVertex = NS_MAX((lineHeight - 1.0) * 2.0, 1.0);
pt.x -= lineHeight;
aGfxContext->MoveTo(pt); // 1
pt.x = rect.pos.x;
aGfxContext->LineTo(pt); // 2
PRBool goDown = PR_TRUE;
while (pt.x < rightMost) {
pt.x += adv;
pt.y += goDown ? adv : -adv;
aGfxContext->LineTo(pt); // 3 and 5
pt.x += flatLengthAtVertex;
aGfxContext->LineTo(pt); // 4 and 6
goDown = !goDown;
}
aGfxContext->Stroke();
break;
}
default:
NS_ERROR("Invalid style value!");
break;
}
if (contextIsSaved) {
aGfxContext->Restore();
} else {
aGfxContext->SetPattern(oldPattern);
aGfxContext->SetLineWidth(oldLineWidth);
}
}
nsRect
nsCSSRendering::GetTextDecorationRect(nsPresContext* aPresContext,
const gfxSize& aLineSize,
const gfxFloat aAscent,
const gfxFloat aOffset,
const PRUint8 aDecoration,
const PRUint8 aStyle,
const gfxFloat aDescentLimit)
{
NS_ASSERTION(aPresContext, "aPresContext is null");
NS_ASSERTION(aStyle != DECORATION_STYLE_NONE, "aStyle is none");
gfxRect rect =
GetTextDecorationRectInternal(gfxPoint(0, 0), aLineSize, aAscent, aOffset,
aDecoration, aStyle, aDescentLimit);
// The rect values are already rounded to nearest device pixels.
nsRect r;
r.x = aPresContext->GfxUnitsToAppUnits(rect.X());
r.y = aPresContext->GfxUnitsToAppUnits(rect.Y());
r.width = aPresContext->GfxUnitsToAppUnits(rect.Width());
r.height = aPresContext->GfxUnitsToAppUnits(rect.Height());
return r;
}
gfxRect
nsCSSRendering::GetTextDecorationRectInternal(const gfxPoint& aPt,
const gfxSize& aLineSize,
const gfxFloat aAscent,
const gfxFloat aOffset,
const PRUint8 aDecoration,
const PRUint8 aStyle,
const gfxFloat aDescentLimit)
{
NS_ASSERTION(aStyle <= DECORATION_STYLE_WAVY, "Invalid aStyle value");
if (aStyle == DECORATION_STYLE_NONE)
return gfxRect(0, 0, 0, 0);
PRBool canLiftUnderline = aDescentLimit >= 0.0;
gfxRect r;
r.pos.x = NS_floor(aPt.x + 0.5);
r.size.width = NS_round(aLineSize.width);
gfxFloat lineHeight = NS_round(aLineSize.height);
lineHeight = NS_MAX(lineHeight, 1.0);
gfxFloat ascent = NS_round(aAscent);
gfxFloat descentLimit = NS_floor(aDescentLimit);
gfxFloat suggestedMaxRectHeight = NS_MAX(NS_MIN(ascent, descentLimit), 1.0);
r.size.height = lineHeight;
if (aStyle == DECORATION_STYLE_DOUBLE) {
/**
* We will draw double line as:
*
* +-------------------------------------------+
* |XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX| ^
* |XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX| | lineHeight
* |XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX| v
* | | ^
* | | | gap
* | | v
* |XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX| ^
* |XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX| | lineHeight
* |XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX| v
* +-------------------------------------------+
*/
gfxFloat gap = NS_round(lineHeight / 2.0);
gap = NS_MAX(gap, 1.0);
r.size.height = lineHeight * 2.0 + gap;
if (canLiftUnderline) {
if (r.Height() > suggestedMaxRectHeight) {
// Don't shrink the line height, because the thickness has some meaning.
// We can just shrink the gap at this time.
r.size.height = NS_MAX(suggestedMaxRectHeight, lineHeight * 2.0 + 1.0);
}
}
} else if (aStyle == DECORATION_STYLE_WAVY) {
/**
* We will draw wavy line as:
*
* +-------------------------------------------+
* |XXXXX XXXXXX XXXXXX | ^
* |XXXXXX XXXXXXXX XXXXXXXX | | lineHeight
* |XXXXXXX XXXXXXXXXX XXXXXXXXXX| v
* | XXX XXX XXX XXX XX|
* | XXXXXXXXXX XXXXXXXXXX X|
* | XXXXXXXX XXXXXXXX |
* | XXXXXX XXXXXX |
* +-------------------------------------------+
*/
r.size.height = lineHeight > 2.0 ? lineHeight * 4.0 : lineHeight * 3.0;
if (canLiftUnderline) {
if (r.Height() > suggestedMaxRectHeight) {
// Don't shrink the line height even if there is not enough space,
// because the thickness has some meaning. E.g., the 1px wavy line and
// 2px wavy line can be used for different meaning in IME selections
// at same time.
r.size.height = NS_MAX(suggestedMaxRectHeight, lineHeight * 2.0);
}
}
}
gfxFloat baseline = NS_floor(aPt.y + aAscent + 0.5);
gfxFloat offset = 0.0;
switch (aDecoration) {
case NS_STYLE_TEXT_DECORATION_UNDERLINE:
offset = aOffset;
if (canLiftUnderline) {
if (descentLimit < -offset + r.Height()) {
// If we can ignore the offset and the decoration line is overflowing,
// we should align the bottom edge of the decoration line rect if it's
// possible. Otherwise, we should lift up the top edge of the rect as
// far as possible.
gfxFloat offsetBottomAligned = -descentLimit + r.Height();
gfxFloat offsetTopAligned = 0.0;
offset = NS_MIN(offsetBottomAligned, offsetTopAligned);
}
}
break;
case NS_STYLE_TEXT_DECORATION_OVERLINE:
offset = aOffset - lineHeight + r.Height();
break;
case NS_STYLE_TEXT_DECORATION_LINE_THROUGH: {
gfxFloat extra = NS_floor(r.Height() / 2.0 + 0.5);
extra = NS_MAX(extra, lineHeight);
offset = aOffset - lineHeight + extra;
break;
}
default:
NS_ERROR("Invalid decoration value!");
}
r.pos.y = baseline - NS_floor(offset + 0.5);
return r;
}
// ------------------
// ImageRenderer
// ------------------
ImageRenderer::ImageRenderer(nsIFrame* aForFrame,
const nsStyleImage* aImage,
PRUint32 aFlags)
: mForFrame(aForFrame)
, mImage(aImage)
, mType(aImage->GetType())
, mImageContainer(nsnull)
, mGradientData(nsnull)
#ifdef MOZ_SVG
, mPaintServerFrame(nsnull)
#endif
, mIsReady(PR_FALSE)
, mSize(0, 0)
, mFlags(aFlags)
{
}
ImageRenderer::~ImageRenderer()
{
}
PRBool
ImageRenderer::PrepareImage()
{
if (mImage->IsEmpty() || !mImage->IsComplete()) {
// Make sure the image is actually decoding
mImage->RequestDecode();
// We can not prepare the image for rendering if it is not fully loaded.
//
// Special case: If we requested a sync decode and we have an image, push
// on through
nsCOMPtr<imgIContainer> img;
if (!((mFlags & FLAG_SYNC_DECODE_IMAGES) &&
(mType == eStyleImageType_Image) &&
(NS_SUCCEEDED(mImage->GetImageData()->GetImage(getter_AddRefs(img))) && img)))
return PR_FALSE;
}
switch (mType) {
case eStyleImageType_Image:
{
nsCOMPtr<imgIContainer> srcImage;
mImage->GetImageData()->GetImage(getter_AddRefs(srcImage));
NS_ABORT_IF_FALSE(srcImage, "If srcImage is null, mImage->IsComplete() "
"should have returned false");
if (!mImage->GetCropRect()) {
mImageContainer.swap(srcImage);
} else {
nsIntRect actualCropRect;
PRBool isEntireImage;
PRBool success =
mImage->ComputeActualCropRect(actualCropRect, &isEntireImage);
NS_ASSERTION(success, "ComputeActualCropRect() should not fail here");
if (!success || actualCropRect.IsEmpty()) {
// The cropped image has zero size
return PR_FALSE;
}
if (isEntireImage) {
// The cropped image is identical to the source image
mImageContainer.swap(srcImage);
} else {
nsCOMPtr<imgIContainer> subImage;
PRUint32 aExtractFlags = (mFlags & FLAG_SYNC_DECODE_IMAGES)
? (PRUint32) imgIContainer::FLAG_SYNC_DECODE
: (PRUint32) imgIContainer::FLAG_NONE;
nsresult rv = srcImage->ExtractFrame(imgIContainer::FRAME_CURRENT,
actualCropRect, aExtractFlags,
getter_AddRefs(subImage));
if (NS_FAILED(rv)) {
NS_WARNING("The cropped image contains no pixels to draw; "
"maybe the crop rect is outside the image frame rect");
return PR_FALSE;
}
mImageContainer.swap(subImage);
}
}
mIsReady = PR_TRUE;
break;
}
case eStyleImageType_Gradient:
mGradientData = mImage->GetGradientData();
mIsReady = PR_TRUE;
break;
#ifdef MOZ_SVG
case eStyleImageType_Element:
{
nsAutoString elementId =
NS_LITERAL_STRING("#") + nsDependentString(mImage->GetElementId());
nsCOMPtr<nsIURI> targetURI;
nsCOMPtr<nsIURI> base = mForFrame->GetContent()->GetBaseURI();
nsContentUtils::NewURIWithDocumentCharset(getter_AddRefs(targetURI), elementId,
mForFrame->GetContent()->GetCurrentDoc(), base);
nsSVGPaintingProperty* property = nsSVGEffects::GetPaintingPropertyForURI(
targetURI, mForFrame->GetFirstContinuation(),
nsSVGEffects::BackgroundImageProperty());
if (!property)
return PR_FALSE;
mPaintServerFrame = property->GetReferencedFrame();
// If the referenced element doesn't have a frame we might still be able
// to paint it if it's an <img>, <canvas>, or <video> element.
if (!mPaintServerFrame) {
nsCOMPtr<nsIDOMElement> imageElement =
do_QueryInterface(property->GetReferencedElement());
mImageElementSurface = nsLayoutUtils::SurfaceFromElement(imageElement);
if (!mImageElementSurface.mSurface)
return PR_FALSE;
}
mIsReady = PR_TRUE;
break;
}
#endif
case eStyleImageType_Null:
default:
break;
}
return mIsReady;
}
nsSize
ImageRenderer::ComputeSize(const nsSize& aDefault)
{
NS_ASSERTION(mIsReady, "Ensure PrepareImage() has returned true "
"before calling me");
switch (mType) {
case eStyleImageType_Image:
{
nsIntSize imageIntSize;
PRBool gotHeight, gotWidth;
nsLayoutUtils::ComputeSizeForDrawing(mImageContainer, imageIntSize,
gotWidth, gotHeight);
mSize.width = gotWidth ?
nsPresContext::CSSPixelsToAppUnits(imageIntSize.width) :
aDefault.width;
mSize.height = gotHeight ?
nsPresContext::CSSPixelsToAppUnits(imageIntSize.height) :
aDefault.height;
break;
}
case eStyleImageType_Gradient:
mSize = aDefault;
break;
#ifdef MOZ_SVG
case eStyleImageType_Element:
{
if (mPaintServerFrame) {
if (mPaintServerFrame->IsFrameOfType(nsIFrame::eSVG)) {
mSize = aDefault;
} else {
// The intrinsic image size for a generic nsIFrame paint server is
// the frame's bbox size rounded to device pixels.
PRInt32 appUnitsPerDevPixel =
mForFrame->PresContext()->AppUnitsPerDevPixel();
nsRect rect =
nsSVGIntegrationUtils::GetNonSVGUserSpace(mPaintServerFrame);
nsRect size = rect - rect.TopLeft();
nsIntRect rounded = size.ToNearestPixels(appUnitsPerDevPixel);
mSize = rounded.ToAppUnits(appUnitsPerDevPixel).Size();
}
} else {
NS_ASSERTION(mImageElementSurface.mSurface, "Surface should be ready.");
gfxIntSize size = mImageElementSurface.mSize;
mSize.width = nsPresContext::CSSPixelsToAppUnits(size.width);
mSize.height = nsPresContext::CSSPixelsToAppUnits(size.height);
}
break;
}
#endif
case eStyleImageType_Null:
default:
mSize.SizeTo(0, 0);
break;
}
return mSize;
}
void
ImageRenderer::Draw(nsPresContext* aPresContext,
nsIRenderingContext& aRenderingContext,
const nsRect& aDest,
const nsRect& aFill,
const nsPoint& aAnchor,
const nsRect& aDirty)
{
if (!mIsReady) {
NS_NOTREACHED("Ensure PrepareImage() has returned true before calling me");
return;
}
if (aDest.IsEmpty() || aFill.IsEmpty() ||
mSize.width <= 0 || mSize.height <= 0)
return;
gfxPattern::GraphicsFilter graphicsFilter =
nsLayoutUtils::GetGraphicsFilterForFrame(mForFrame);
switch (mType) {
case eStyleImageType_Image:
{
PRUint32 drawFlags = (mFlags & FLAG_SYNC_DECODE_IMAGES)
? (PRUint32) imgIContainer::FLAG_SYNC_DECODE
: (PRUint32) imgIContainer::FLAG_NONE;
nsLayoutUtils::DrawImage(&aRenderingContext, mImageContainer,
graphicsFilter,
aDest, aFill, aAnchor, aDirty, drawFlags);
break;
}
case eStyleImageType_Gradient:
nsCSSRendering::PaintGradient(aPresContext, aRenderingContext,
mGradientData, aDirty, aDest, aFill);
break;
#ifdef MOZ_SVG
case eStyleImageType_Element:
if (mPaintServerFrame) {
nsSVGIntegrationUtils::DrawPaintServer(
&aRenderingContext, mForFrame, mPaintServerFrame, graphicsFilter,
aDest, aFill, aAnchor, aDirty, mSize);
} else {
NS_ASSERTION(mImageElementSurface.mSurface, "Surface should be ready.");
nsRefPtr<gfxDrawable> surfaceDrawable =
new gfxSurfaceDrawable(mImageElementSurface.mSurface,
mImageElementSurface.mSize);
nsLayoutUtils::DrawPixelSnapped(
&aRenderingContext, surfaceDrawable, graphicsFilter,
aDest, aFill, aAnchor, aDirty);
}
break;
#endif
case eStyleImageType_Null:
default:
break;
}
}
#define MAX_BLUR_RADIUS 300
#define MAX_SPREAD_RADIUS 50
static inline gfxIntSize
ComputeBlurRadius(nscoord aBlurRadius, PRInt32 aAppUnitsPerDevPixel)
{
// http://dev.w3.org/csswg/css3-background/#box-shadow says that the
// standard deviation of the blur should be half the given blur value.
gfxFloat blurStdDev =
NS_MIN(gfxFloat(aBlurRadius) / gfxFloat(aAppUnitsPerDevPixel),
gfxFloat(MAX_BLUR_RADIUS))
/ 2.0;
return
gfxAlphaBoxBlur::CalculateBlurRadius(gfxPoint(blurStdDev, blurStdDev));
}
// -----
// nsContextBoxBlur
// -----
gfxContext*
nsContextBoxBlur::Init(const nsRect& aRect, nscoord aSpreadRadius,
nscoord aBlurRadius,
PRInt32 aAppUnitsPerDevPixel,
gfxContext* aDestinationCtx,
const nsRect& aDirtyRect,
const gfxRect* aSkipRect,
PRUint32 aFlags)
{
if (aRect.IsEmpty()) {
mContext = nsnull;
return nsnull;
}
gfxIntSize blurRadius = ComputeBlurRadius(aBlurRadius, aAppUnitsPerDevPixel);
PRInt32 spreadRadius = NS_MIN(PRInt32(aSpreadRadius / aAppUnitsPerDevPixel),
PRInt32(MAX_SPREAD_RADIUS));
mDestinationCtx = aDestinationCtx;
// If not blurring, draw directly onto the destination device
if (blurRadius.width <= 0 && blurRadius.height <= 0 && spreadRadius <= 0 &&
!(aFlags & FORCE_MASK)) {
mContext = aDestinationCtx;
return mContext;
}
// Convert from app units to device pixels
gfxRect rect = nsLayoutUtils::RectToGfxRect(aRect, aAppUnitsPerDevPixel);
gfxRect dirtyRect =
nsLayoutUtils::RectToGfxRect(aDirtyRect, aAppUnitsPerDevPixel);
dirtyRect.RoundOut();
// Create the temporary surface for blurring
mContext = blur.Init(rect, gfxIntSize(spreadRadius, spreadRadius),
blurRadius, &dirtyRect, aSkipRect);
return mContext;
}
void
nsContextBoxBlur::DoPaint()
{
if (mContext == mDestinationCtx)
return;
blur.Paint(mDestinationCtx);
}
gfxContext*
nsContextBoxBlur::GetContext()
{
return mContext;
}
/* static */ nsMargin
nsContextBoxBlur::GetBlurRadiusMargin(nscoord aBlurRadius,
PRInt32 aAppUnitsPerDevPixel)
{
gfxIntSize blurRadius = ComputeBlurRadius(aBlurRadius, aAppUnitsPerDevPixel);
nsMargin result;
result.top = blurRadius.height * aAppUnitsPerDevPixel;
result.right = blurRadius.width * aAppUnitsPerDevPixel;
result.bottom = blurRadius.height * aAppUnitsPerDevPixel;
result.left = blurRadius.width * aAppUnitsPerDevPixel;
return result;
}
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