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gecko/layout/base/nsCSSRendering.cpp

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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>
*
* 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 "nsIImage.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 "gfxIImageFrame.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 "nsCSSRenderingBorders.h"
// 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;
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 furhter 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;
nscoord mContinuationPoint;
nscoord mUnbrokenWidth;
nsRect mBoundingBox;
PRBool mBidiEnabled;
nsBlockFrame* mBlockFrame;
nscoord mLineContinuationPoint;
void SetFrame(nsIFrame* aFrame)
{
NS_PRECONDITION(aFrame, "Need a frame");
nsIFrame *prevContinuation = aFrame->GetPrevContinuation();
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;
}
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 = aFrame->GetPrevContinuation();
while (inlineFrame) {
nsRect rect = inlineFrame->GetRect();
mContinuationPoint += rect.width;
mUnbrokenWidth += rect.width;
mBoundingBox.UnionRect(mBoundingBox, rect);
inlineFrame = inlineFrame->GetPrevContinuation();
}
// 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 = inlineFrame->GetNextContinuation();
}
mFrame = aFrame;
mBidiEnabled = aFrame->PresContext()->BidiEnabled();
if (mBidiEnabled) {
// Find the containing block frame
nsIFrame* frame = aFrame;
nsresult rv = NS_ERROR_FAILURE;
while (frame &&
frame->IsFrameOfType(nsIFrame::eLineParticipant) &&
NS_FAILED(rv)) {
frame = frame->GetParent();
rv = frame->QueryInterface(kBlockFrameCID, (void**)&mBlockFrame);
}
NS_ASSERTION(NS_SUCCEEDED(rv) && 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 DrawBorderImage(nsPresContext* aPresContext,
nsIRenderingContext& aRenderingContext,
nsIFrame* aForFrame,
const nsRect& aBorderArea,
const nsStyleBorder& aBorderStyle);
static void DrawBorderImageSide(gfxContext *aThebesContext,
nsIDeviceContext* aDeviceContext,
imgIContainer* aImage,
gfxRect& aDestRect,
gfxSize aInterSize,
gfxRect& aSourceRect,
PRUint8 aHFillType,
PRUint8 aVFillType);
static void PaintBackgroundColor(nsPresContext* aPresContext,
nsIRenderingContext& aRenderingContext,
nsIFrame* aForFrame,
const nsRect& aBgClipArea,
const nsStyleBackground& aColor,
const nsStyleBorder& aBorder,
PRBool aCanPaintNonWhite);
static nscolor MakeBevelColor(PRIntn whichSide, PRUint8 style,
nscolor aBackgroundColor,
nscolor aBorderColor);
static gfxRect GetTextDecorationRectInternal(const gfxPoint& aPt,
const gfxSize& aLineSize,
const gfxFloat aAscent,
const gfxFloat aOffset,
const PRUint8 aDecoration,
const PRUint8 aStyle);
/* Returns FALSE iff all returned aTwipsRadii == 0, TRUE otherwise */
static PRBool GetBorderRadiusTwips(const nsStyleCorners& aBorderRadius,
const nscoord& aFrameWidth,
nscoord aTwipsRadii[8]);
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(PRIntn 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
// helper function to convert a nsRect to a gfxRect
static gfxRect
RectToGfxRect(const nsRect& rect, nscoord twipsPerPixel)
{
return gfxRect(gfxFloat(rect.x) / twipsPerPixel,
gfxFloat(rect.y) / twipsPerPixel,
gfxFloat(rect.width) / twipsPerPixel,
gfxFloat(rect.height) / twipsPerPixel);
}
/*
* Compute the float-pixel radii that should be used for drawing
* this border/outline, given the various input bits.
*
* If a side is skipped via skipSides, its corners are forced to 0.
* All corner radii are then adjusted so they do not require more
* space than outerRect, according to the algorithm in css3-background.
*/
static void
ComputePixelRadii(const nscoord *aTwipsRadii,
const nsRect& outerRect,
PRIntn skipSides,
nscoord twipsPerPixel,
gfxCornerSizes *oBorderRadii)
{
nscoord twipsRadii[8];
memcpy(twipsRadii, aTwipsRadii, sizeof twipsRadii);
if (skipSides & SIDE_BIT_TOP) {
twipsRadii[NS_CORNER_TOP_LEFT_X] = 0;
twipsRadii[NS_CORNER_TOP_LEFT_Y] = 0;
twipsRadii[NS_CORNER_TOP_RIGHT_X] = 0;
twipsRadii[NS_CORNER_TOP_RIGHT_Y] = 0;
}
if (skipSides & SIDE_BIT_RIGHT) {
twipsRadii[NS_CORNER_TOP_RIGHT_X] = 0;
twipsRadii[NS_CORNER_TOP_RIGHT_Y] = 0;
twipsRadii[NS_CORNER_BOTTOM_RIGHT_X] = 0;
twipsRadii[NS_CORNER_BOTTOM_RIGHT_Y] = 0;
}
if (skipSides & SIDE_BIT_BOTTOM) {
twipsRadii[NS_CORNER_BOTTOM_RIGHT_X] = 0;
twipsRadii[NS_CORNER_BOTTOM_RIGHT_Y] = 0;
twipsRadii[NS_CORNER_BOTTOM_LEFT_X] = 0;
twipsRadii[NS_CORNER_BOTTOM_LEFT_Y] = 0;
}
if (skipSides & SIDE_BIT_LEFT) {
twipsRadii[NS_CORNER_BOTTOM_LEFT_X] = 0;
twipsRadii[NS_CORNER_BOTTOM_LEFT_Y] = 0;
twipsRadii[NS_CORNER_TOP_LEFT_X] = 0;
twipsRadii[NS_CORNER_TOP_LEFT_Y] = 0;
}
gfxFloat radii[8];
NS_FOR_CSS_HALF_CORNERS(corner)
radii[corner] = twipsRadii[corner] / twipsPerPixel;
// css3-background specifies this algorithm for reducing
// corner radii when they are too big.
gfxFloat maxWidth = outerRect.width / twipsPerPixel;
gfxFloat maxHeight = outerRect.height / twipsPerPixel;
gfxFloat f = 1.0f;
NS_FOR_CSS_SIDES(side) {
PRUint32 hc1 = NS_SIDE_TO_HALF_CORNER(side, PR_FALSE, PR_TRUE);
PRUint32 hc2 = NS_SIDE_TO_HALF_CORNER(side, PR_TRUE, PR_TRUE);
gfxFloat length = NS_SIDE_IS_VERTICAL(side) ? maxHeight : maxWidth;
gfxFloat sum = radii[hc1] + radii[hc2];
// avoid floating point division in the normal case
if (length < sum)
f = PR_MIN(f, length/sum);
}
if (f < 1.0) {
NS_FOR_CSS_HALF_CORNERS(corner) {
radii[corner] *= f;
}
}
(*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,
const nsStyleBorder& aBorderStyle,
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 (aBorderStyle.IsBorderImageLoaded()) {
DrawBorderImage(aPresContext, aRenderingContext, aForFrame,
aBorderArea, aBorderStyle);
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
const nsStyleBackground* bgColor = nsCSSRendering::FindNonTransparentBackground
(aStyleContext, compatMode == eCompatibility_NavQuirks ? PR_TRUE : PR_FALSE);
border = aBorderStyle.GetComputedBorder();
if ((0 == border.left) && (0 == border.right) &&
(0 == border.top) && (0 == border.bottom)) {
// Empty border area
return;
}
GetBorderRadiusTwips(aBorderStyle.mBorderRadius, aForFrame->GetSize().width,
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(RectToGfxRect(outerRect, twipsPerPixel));
// convert the border widths
gfxFloat borderWidths[4] = { border.top / twipsPerPixel,
border.right / twipsPerPixel,
border.bottom / twipsPerPixel,
border.left / twipsPerPixel };
// convert the radii
gfxCornerSizes borderRadii;
ComputePixelRadii(twipsRadii, outerRect, aSkipSides, 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] = aBorderStyle.GetBorderStyle(i);
aBorderStyle.GetBorderColor(i, borderColors[i], foreground);
aBorderStyle.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->mBackgroundColor);
br.DrawBorders();
ctx->Restore();
SN();
}
static nsRect
GetOutlineInnerRect(nsIFrame* aFrame)
{
nsRect* savedOutlineInnerRect = static_cast<nsRect*>
(aFrame->GetProperty(nsGkAtoms::outlineInnerRectProperty));
if (savedOutlineInnerRect)
return *savedOutlineInnerRect;
return aFrame->GetOverflowRect();
}
void
nsCSSRendering::PaintOutline(nsPresContext* aPresContext,
nsIRenderingContext& aRenderingContext,
nsIFrame* aForFrame,
const nsRect& aDirtyRect,
const nsRect& aBorderArea,
const nsStyleBorder& aBorderStyle,
const nsStyleOutline& aOutlineStyle,
nsStyleContext* aStyleContext)
{
nscoord twipsRadii[8];
// Get our style context's color struct.
const nsStyleColor* ourColor = aStyleContext->GetStyleColor();
nscoord width;
aOutlineStyle.GetOutlineWidth(width);
if (width == 0) {
// Empty outline
return;
}
const nsStyleBackground* bgColor = nsCSSRendering::FindNonTransparentBackground
(aStyleContext, PR_FALSE);
// get the radius for our outline
GetBorderRadiusTwips(aOutlineStyle.mOutlineRadius, aBorderArea.width,
twipsRadii);
// 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()->GetPseudoType();
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 = aOutlineStyle.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 our conversion values
nscoord twipsPerPixel = aPresContext->DevPixelsToAppUnits(1);
// get the outer rectangles
gfxRect oRect(RectToGfxRect(outerRect, twipsPerPixel));
// convert the radii
nsMargin outlineMargin(width, width, width, width);
gfxCornerSizes outlineRadii;
ComputePixelRadii(twipsRadii, outerRect, 0, twipsPerPixel,
&outlineRadii);
PRUint8 outlineStyle = aOutlineStyle.GetOutlineStyle();
PRUint8 outlineStyles[4] = { outlineStyle,
outlineStyle,
outlineStyle,
outlineStyle };
nscolor outlineColor;
// PR_FALSE means use the initial color; PR_TRUE means a color was
// set.
if (!aOutlineStyle.GetOutlineColor(outlineColor))
outlineColor = ourColor->mColor;
nscolor outlineColors[4] = { outlineColor,
outlineColor,
outlineColor,
outlineColor };
// convert the border widths
gfxFloat outlineWidths[4] = { width / twipsPerPixel,
width / twipsPerPixel,
width / twipsPerPixel,
width / twipsPerPixel };
// start drawing
gfxContext *ctx = aRenderingContext.ThebesContext();
ctx->Save();
nsCSSBorderRenderer br(twipsPerPixel,
ctx,
oRect,
outlineStyles,
outlineWidths,
outlineRadii,
outlineColors,
nsnull, 0,
bgColor->mBackgroundColor);
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(RectToGfxRect(aFocusRect, oneDevPixel));
gfxCornerSizes focusRadii;
{
nscoord twipsRadii[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };
ComputePixelRadii(twipsRadii, aFocusRect, 0, oneDevPixel, &focusRadii);
}
gfxFloat focusWidths[4] = { oneCSSPixel / oneDevPixel,
oneCSSPixel / oneDevPixel,
oneCSSPixel / oneDevPixel,
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& aColor,
const nsSize& aOriginBounds,
const nsSize& aImageSize,
nsPoint* aTopLeft,
nsPoint* aAnchorPoint)
{
if (NS_STYLE_BG_X_POSITION_LENGTH & aColor.mBackgroundFlags) {
aTopLeft->x = aAnchorPoint->x = aColor.mBackgroundXPosition.mCoord;
}
else if (NS_STYLE_BG_X_POSITION_PERCENT & aColor.mBackgroundFlags) {
double percent = aColor.mBackgroundXPosition.mFloat;
aAnchorPoint->x = NSToCoordRound(percent*aOriginBounds.width);
aTopLeft->x = NSToCoordRound(percent*(aOriginBounds.width - aImageSize.width));
}
else {
aTopLeft->x = aAnchorPoint->x = 0;
}
if (NS_STYLE_BG_Y_POSITION_LENGTH & aColor.mBackgroundFlags) {
aTopLeft->y = aAnchorPoint->y = aColor.mBackgroundYPosition.mCoord;
}
else if (NS_STYLE_BG_Y_POSITION_PERCENT & aColor.mBackgroundFlags) {
double percent = aColor.mBackgroundYPosition.mFloat;
aAnchorPoint->y = NSToCoordRound(percent*aOriginBounds.height);
aTopLeft->y = NSToCoordRound(percent*(aOriginBounds.height - aImageSize.height));
}
else {
aTopLeft->y = aAnchorPoint->y = 0;
}
}
const nsStyleBackground*
nsCSSRendering::FindNonTransparentBackground(nsStyleContext* aContext,
PRBool aStartAtParent /*= PR_FALSE*/)
{
NS_ASSERTION(aContext, "Cannot find NonTransparentBackground in a null context" );
const nsStyleBackground* result = nsnull;
nsStyleContext* context = nsnull;
if (aStartAtParent) {
context = aContext->GetParent();
}
if (!context) {
context = aContext;
}
while (context) {
result = context->GetStyleBackground();
if (NS_GET_A(result->mBackgroundColor) > 0)
break;
context = context->GetParent();
}
return result;
}
/**
* |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|. It fills in a boolean indicating
* whether the frame is the canvas frame to allow PaintBackground to
* ensure that it always paints something non-transparent for the
* canvas.
*/
// 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.
inline PRBool
IsCanvasFrame(nsIFrame *aFrame)
{
nsIAtom* frameType = aFrame->GetType();
return frameType == nsGkAtoms::canvasFrame ||
frameType == nsGkAtoms::rootFrame ||
frameType == nsGkAtoms::pageFrame ||
frameType == nsGkAtoms::pageContentFrame ||
frameType == nsGkAtoms::viewportFrame;
}
inline PRBool
FindCanvasBackground(nsIFrame* aForFrame, nsIFrame* aRootElementFrame,
const nsStyleBackground** aBackground)
{
if (aRootElementFrame) {
const nsStyleBackground* result = aRootElementFrame->GetStyleBackground();
// Check if we need to do propagation from BODY rather than HTML.
if (result->IsTransparent()) {
nsIContent* content = aRootElementFrame->GetContent();
// The root element content can't be null. We wouldn't know what
// frame to create for aRootElementFrame.
// Use |GetOwnerDoc| so it works during destruction.
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 = aForFrame->PresContext()->GetPresShell()->
GetPrimaryFrameFor(bodyContent);
if (bodyFrame)
result = bodyFrame->GetStyleBackground();
}
}
}
*aBackground = result;
} else {
// This should always give transparent, so we'll fill it in with the
// default color if needed. This seems to happen a bit while a page is
// being loaded.
*aBackground = aForFrame->GetStyleBackground();
}
return PR_TRUE;
}
inline PRBool
FindElementBackground(nsIFrame* aForFrame, nsIFrame* aRootElementFrame,
const nsStyleBackground** aBackground)
{
if (aForFrame == aRootElementFrame) {
// We must have propagated our background to the viewport or canvas. Abort.
return PR_FALSE;
}
*aBackground = aForFrame->GetStyleBackground();
// 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()->GetPseudoType())
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,
const nsStyleBackground** aBackground,
PRBool* aIsCanvas)
{
nsIFrame* rootElementFrame =
aPresContext->PresShell()->FrameConstructor()->GetRootElementStyleFrame();
PRBool isCanvasFrame = IsCanvasFrame(aForFrame);
*aIsCanvas = isCanvasFrame;
return isCanvasFrame
? FindCanvasBackground(aForFrame, rootElementFrame, aBackground)
: FindElementBackground(aForFrame, rootElementFrame, aBackground);
}
void
nsCSSRendering::DidPaint()
{
gInlineBGData->Reset();
}
static PRBool
GetBorderRadiusTwips(const nsStyleCorners& aBorderRadius,
const nscoord& aFrameWidth, nscoord aTwipsRadii[8])
{
PRBool result = PR_FALSE;
// Convert percentage values
NS_FOR_CSS_HALF_CORNERS(i) {
const nsStyleCoord c = aBorderRadius.Get(i);
switch (c.GetUnit()) {
case eStyleUnit_Percent:
aTwipsRadii[i] = (nscoord)(c.GetPercentValue() * aFrameWidth);
break;
case eStyleUnit_Coord:
aTwipsRadii[i] = c.GetCoordValue();
break;
default:
NS_NOTREACHED("GetBorderRadiusTwips: bad unit");
aTwipsRadii[i] = 0;
break;
}
if (aTwipsRadii[i])
result = PR_TRUE;
}
return result;
}
void
nsCSSRendering::PaintBoxShadow(nsPresContext* aPresContext,
nsIRenderingContext& aRenderingContext,
nsIFrame* aForFrame,
const nsPoint& aForFramePt,
const nsRect& aDirtyRect)
{
nsMargin borderValues;
PRIntn sidesToSkip;
nsRect frameRect;
const nsStyleBorder* styleBorder = aForFrame->GetStyleBorder();
borderValues = styleBorder->GetActualBorder();
sidesToSkip = aForFrame->GetSkipSides();
frameRect = nsRect(aForFramePt, aForFrame->GetSize());
// Get any border radius, since box-shadow must also have rounded corners if the frame does
nscoord twipsRadii[8];
PRBool hasBorderRadius = GetBorderRadiusTwips(styleBorder->mBorderRadius,
frameRect.width, twipsRadii);
nscoord twipsPerPixel = aPresContext->DevPixelsToAppUnits(1);
gfxCornerSizes borderRadii;
ComputePixelRadii(twipsRadii, frameRect, sidesToSkip,
twipsPerPixel, &borderRadii);
gfxRect frameGfxRect = RectToGfxRect(frameRect, twipsPerPixel);
gfxRect dirtyGfxRect = RectToGfxRect(aDirtyRect, twipsPerPixel);
for (PRUint32 i = styleBorder->mBoxShadow->Length(); i > 0; --i) {
nsCSSShadowItem* shadowItem = styleBorder->mBoxShadow->ShadowAt(i - 1);
gfxRect shadowRect(frameRect.x, frameRect.y, frameRect.width, frameRect.height);
shadowRect.MoveBy(gfxPoint(shadowItem->mXOffset, shadowItem->mYOffset));
shadowRect.Outset(shadowItem->mSpread);
gfxRect shadowRectPlusBlur = shadowRect;
shadowRect.ScaleInverse(twipsPerPixel);
shadowRect.RoundOut();
// shadowRect won't include the blur, so make an extra rect here that includes the blur
// for use in the even-odd rule below.
nscoord blurRadius = shadowItem->mRadius;
shadowRectPlusBlur.Outset(blurRadius);
shadowRectPlusBlur.ScaleInverse(twipsPerPixel);
shadowRectPlusBlur.RoundOut();
gfxContext* renderContext = aRenderingContext.ThebesContext();
nsRefPtr<gfxContext> shadowContext;
nsContextBoxBlur blurringArea;
// shadowRect is already in device pixels, pass 1 as the appunits/pixel value
blurRadius /= twipsPerPixel;
shadowContext = blurringArea.Init(shadowRect, blurRadius, 1, renderContext, dirtyGfxRect);
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 out the area of the actual frame so the shadow is not shown within
// the frame
renderContext->NewPath();
renderContext->Rectangle(shadowRectPlusBlur);
if (hasBorderRadius)
renderContext->RoundedRectangle(frameGfxRect, borderRadii);
else
renderContext->Rectangle(frameGfxRect);
renderContext->SetFillRule(gfxContext::FILL_RULE_EVEN_ODD);
renderContext->Clip();
// 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.
shadowContext->NewPath();
if (hasBorderRadius)
shadowContext->RoundedRectangle(shadowRect, borderRadii);
else
shadowContext->Rectangle(shadowRect);
shadowContext->Fill();
blurringArea.DoPaint();
renderContext->Restore();
}
}
void
nsCSSRendering::PaintBackground(nsPresContext* aPresContext,
nsIRenderingContext& aRenderingContext,
nsIFrame* aForFrame,
const nsRect& aDirtyRect,
const nsRect& aBorderArea,
PRBool aUsePrintSettings,
nsRect* aBGClipRect)
{
NS_PRECONDITION(aForFrame,
"Frame is expected to be provided to PaintBackground");
PRBool isCanvas;
const nsStyleBackground *color;
const nsStyleBorder* border = aForFrame->GetStyleBorder();
if (!FindBackground(aPresContext, aForFrame, &color, &isCanvas)) {
// we don't want to bail out of 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;
}
color = aForFrame->GetStyleBackground();
}
if (!isCanvas) {
PaintBackgroundWithSC(aPresContext, aRenderingContext, aForFrame,
aDirtyRect, aBorderArea, *color, *border,
aUsePrintSettings, aBGClipRect);
return;
}
nsStyleBackground canvasColor(*color);
nsIViewManager* vm = aPresContext->GetViewManager();
if (NS_GET_A(canvasColor.mBackgroundColor) < 255) {
// If the window is intended to be opaque, ensure that we always
// paint an opaque color for its root element, in case there's no
// background at all or a partly transparent image.
nsIView* rView;
vm->GetRootView(rView);
if (!rView->GetParent() &&
(!rView->HasWidget() ||
rView->GetWidget()->GetTransparencyMode() == eTransparencyOpaque)) {
nscolor backColor = aPresContext->DefaultBackgroundColor();
NS_ASSERTION(NS_GET_A(backColor) == 255,
"default background color is not opaque");
canvasColor.mBackgroundColor =
NS_ComposeColors(backColor, canvasColor.mBackgroundColor);
}
}
vm->SetDefaultBackgroundColor(canvasColor.mBackgroundColor);
PaintBackgroundWithSC(aPresContext, aRenderingContext, aForFrame,
aDirtyRect, aBorderArea, canvasColor,
*border, aUsePrintSettings, aBGClipRect);
}
static PRBool
IsSolidBorderEdge(const nsStyleBorder& aBorder, PRUint32 aSide)
{
if (aBorder.GetActualBorder().side(aSide) == 0)
return PR_TRUE;
if (aBorder.GetBorderStyle(aSide) != NS_STYLE_BORDER_STYLE_SOLID)
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
IsSolidBorder(const nsStyleBorder& aBorder)
{
if (aBorder.mBorderColors ||
nsLayoutUtils::HasNonZeroCorner(aBorder.mBorderRadius))
return PR_FALSE;
for (PRUint32 i = 0; i < 4; ++i) {
if (!IsSolidBorderEdge(aBorder, i))
return PR_FALSE;
}
return PR_TRUE;
}
void
nsCSSRendering::PaintBackgroundWithSC(nsPresContext* aPresContext,
nsIRenderingContext& aRenderingContext,
nsIFrame* aForFrame,
const nsRect& aDirtyRect,
const nsRect& aBorderArea,
const nsStyleBackground& aColor,
const nsStyleBorder& aBorder,
PRBool aUsePrintSettings,
nsRect* aBGClipRect)
{
NS_PRECONDITION(aForFrame,
"Frame is expected to be provided to PaintBackground");
PRBool canDrawBackgroundImage = PR_TRUE;
PRBool canDrawBackgroundColor = PR_TRUE;
if (aUsePrintSettings) {
canDrawBackgroundImage = aPresContext->GetBackgroundImageDraw();
canDrawBackgroundColor = aPresContext->GetBackgroundColorDraw();
}
// Check to see if we have an appearance defined. If so, we let the theme
// renderer draw the background and bail out.
const nsStyleDisplay* displayData = aForFrame->GetStyleDisplay();
if (displayData->mAppearance) {
nsITheme *theme = aPresContext->GetTheme();
if (theme && theme->ThemeSupportsWidget(aPresContext, aForFrame, displayData->mAppearance)) {
nsRect dirty;
dirty.IntersectRect(aDirtyRect, aBorderArea);
theme->DrawWidgetBackground(&aRenderingContext, aForFrame,
displayData->mAppearance, aBorderArea, dirty);
return;
}
}
// Same coordinate space as aBorderArea
nsRect bgClipArea;
if (aBGClipRect) {
bgClipArea = *aBGClipRect;
}
else {
// The background is rendered over the 'background-clip' area.
bgClipArea = aBorderArea;
// If the border is solid, then clip the background to the padding-box
// so that we don't draw unnecessary tiles.
if (aColor.mBackgroundClip != NS_STYLE_BG_CLIP_BORDER ||
IsSolidBorder(aBorder)) {
nsMargin border = aForFrame->GetUsedBorder();
aForFrame->ApplySkipSides(border);
bgClipArea.Deflate(border);
}
}
gfxContext *ctx = aRenderingContext.ThebesContext();
// The actual dirty rect is the intersection of the 'background-clip'
// area and the dirty rect we were given
nsRect dirtyRect;
if (!dirtyRect.IntersectRect(bgClipArea, aDirtyRect)) {
// Nothing to paint
return;
}
// if there is no background image or background images are turned off, try a color.
if (!aColor.mBackgroundImage || !canDrawBackgroundImage) {
PaintBackgroundColor(aPresContext, aRenderingContext, aForFrame, bgClipArea,
aColor, aBorder, canDrawBackgroundColor);
return;
}
// We have a background image
// Lookup the image
imgIRequest *req = aPresContext->LoadImage(aColor.mBackgroundImage,
aForFrame);
PRUint32 status = imgIRequest::STATUS_ERROR;
if (req)
req->GetImageStatus(&status);
if (!req || !(status & imgIRequest::STATUS_FRAME_COMPLETE) || !(status & imgIRequest::STATUS_SIZE_AVAILABLE)) {
PaintBackgroundColor(aPresContext, aRenderingContext, aForFrame, bgClipArea,
aColor, aBorder, canDrawBackgroundColor);
return;
}
nsCOMPtr<imgIContainer> image;
req->GetImage(getter_AddRefs(image));
nsSize imageSize;
image->GetWidth(&imageSize.width);
image->GetHeight(&imageSize.height);
imageSize.width = nsPresContext::CSSPixelsToAppUnits(imageSize.width);
imageSize.height = nsPresContext::CSSPixelsToAppUnits(imageSize.height);
req = nsnull;
// relative to aBorderArea
nsRect bgOriginRect;
nsIAtom* frameType = aForFrame->GetType();
nsIFrame* geometryFrame = aForFrame;
if (frameType == nsGkAtoms::inlineFrame ||
frameType == nsGkAtoms::positionedInlineFrame) {
switch (aColor.mBackgroundInlinePolicy) {
case NS_STYLE_BG_INLINE_POLICY_EACH_BOX:
bgOriginRect = nsRect(nsPoint(0,0), aBorderArea.Size());
break;
case NS_STYLE_BG_INLINE_POLICY_BOUNDING_BOX:
bgOriginRect = 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:
bgOriginRect = gInlineBGData->GetContinuousRect(aForFrame);
break;
}
} else if (frameType == nsGkAtoms::canvasFrame) {
geometryFrame = aForFrame->GetFirstChild(nsnull);
NS_ASSERTION(geometryFrame, "A canvas with a background "
"image had no child frame, which is impossible according to CSS. "
"Make sure there isn't a background image specified on the "
"|:viewport| pseudo-element in |html.css|.");
bgOriginRect = geometryFrame->GetRect();
} else {
bgOriginRect = 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 (aColor.mBackgroundOrigin != NS_STYLE_BG_ORIGIN_BORDER) {
nsMargin border = geometryFrame->GetUsedBorder();
geometryFrame->ApplySkipSides(border);
bgOriginRect.Deflate(border);
if (aColor.mBackgroundOrigin != NS_STYLE_BG_ORIGIN_PADDING) {
nsMargin padding = geometryFrame->GetUsedPadding();
geometryFrame->ApplySkipSides(padding);
bgOriginRect.Deflate(padding);
NS_ASSERTION(aColor.mBackgroundOrigin == NS_STYLE_BG_ORIGIN_CONTENT,
"unknown background-origin value");
}
}
PRBool needBackgroundColor = NS_GET_A(aColor.mBackgroundColor) > 0;
PRIntn repeat = aColor.mBackgroundRepeat;
switch (repeat) {
case NS_STYLE_BG_REPEAT_X:
break;
case NS_STYLE_BG_REPEAT_Y:
break;
case NS_STYLE_BG_REPEAT_XY:
if (needBackgroundColor) {
// If the image is completely opaque, we do not need to paint the
// background color
nsCOMPtr<gfxIImageFrame> gfxImgFrame;
image->GetCurrentFrame(getter_AddRefs(gfxImgFrame));
if (gfxImgFrame) {
gfxImgFrame->GetNeedsBackground(&needBackgroundColor);
/* check for tiling of a image where frame smaller than container */
nsSize iSize;
image->GetWidth(&iSize.width);
image->GetHeight(&iSize.height);
nsRect iframeRect;
gfxImgFrame->GetRect(iframeRect);
if (iSize.width != iframeRect.width ||
iSize.height != iframeRect.height) {
needBackgroundColor = PR_TRUE;
}
}
}
break;
case NS_STYLE_BG_REPEAT_OFF:
default:
NS_ASSERTION(repeat == NS_STYLE_BG_REPEAT_OFF, "unknown background-repeat value");
break;
}
// The background color is rendered over the 'background-clip' area
if (needBackgroundColor) {
PaintBackgroundColor(aPresContext, aRenderingContext, aForFrame, bgClipArea,
aColor, aBorder, canDrawBackgroundColor);
}
// 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 == aColor.mBackgroundAttachment) {
// 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.
// Remember that we've drawn position-varying content in this prescontext
aPresContext->SetRenderedPositionVaryingContent();
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
}
nsRect viewportArea(nsPoint(0, 0), topFrame->GetSize());
if (!pageContentFrame) {
// Subtract the size of scrollbars.
nsIScrollableFrame* scrollableFrame =
aPresContext->PresShell()->GetRootScrollFrameAsScrollable();
if (scrollableFrame) {
nsMargin scrollbars = scrollableFrame->GetActualScrollbarSizes();
viewportArea.Deflate(scrollbars);
}
}
// Get the anchor point, relative to the viewport.
ComputeBackgroundAnchorPoint(aColor, viewportArea.Size(), imageSize,
&imageTopLeft, &anchor);
// Convert the anchor point from viewport coordinates to aForFrame
// coordinates.
nsPoint offset = viewportArea.TopLeft() - aForFrame->GetOffsetTo(topFrame);
imageTopLeft += offset;
anchor += offset;
} else {
ComputeBackgroundAnchorPoint(aColor, bgOriginRect.Size(), imageSize,
&imageTopLeft, &anchor);
imageTopLeft += bgOriginRect.TopLeft();
anchor += bgOriginRect.TopLeft();
}
ctx->Save();
nscoord borderRadii[8];
PRBool haveRadius = GetBorderRadiusTwips(aBorder.mBorderRadius,
aForFrame->GetSize().width,
borderRadii);
if (haveRadius) {
nscoord appUnitsPerPixel = aPresContext->DevPixelsToAppUnits(1);
gfxCornerSizes radii;
ComputePixelRadii(borderRadii, bgClipArea,
aForFrame ? aForFrame->GetSkipSides() : 0,
appUnitsPerPixel, &radii);
gfxRect oRect(RectToGfxRect(bgClipArea, appUnitsPerPixel));
oRect.Round();
oRect.Condition();
ctx->NewPath();
ctx->RoundedRectangle(oRect, radii);
ctx->Clip();
}
nsRect destArea(imageTopLeft + aBorderArea.TopLeft(), imageSize);
nsRect fillArea = destArea;
if (repeat & NS_STYLE_BG_REPEAT_X) {
fillArea.x = bgClipArea.x;
fillArea.width = bgClipArea.width;
}
if (repeat & NS_STYLE_BG_REPEAT_Y) {
fillArea.y = bgClipArea.y;
fillArea.height = bgClipArea.height;
}
fillArea.IntersectRect(fillArea, bgClipArea);
nsLayoutUtils::DrawImage(&aRenderingContext, image,
destArea, fillArea, anchor + aBorderArea.TopLeft(), dirtyRect);
ctx->Restore();
}
static void
DrawBorderImage(nsPresContext* aPresContext,
nsIRenderingContext& aRenderingContext,
nsIFrame* aForFrame, const nsRect& aBorderArea,
const nsStyleBorder& aBorderStyle)
{
float percent;
nsStyleCoord borderImageSplit[4];
PRInt32 borderImageSplitInt[4];
nsMargin border;
gfxFloat borderTop, borderRight, borderBottom, borderLeft;
gfxFloat borderImageSplitGfx[4];
border = aBorderStyle.GetActualBorder();
if ((0 == border.left) && (0 == border.right) &&
(0 == border.top) && (0 == border.bottom)) {
// Empty border area
return;
}
borderImageSplit[NS_SIDE_TOP] = aBorderStyle.mBorderImageSplit.GetTop();
borderImageSplit[NS_SIDE_RIGHT] = aBorderStyle.mBorderImageSplit.GetRight();
borderImageSplit[NS_SIDE_BOTTOM] = aBorderStyle.mBorderImageSplit.GetBottom();
borderImageSplit[NS_SIDE_LEFT] = aBorderStyle.mBorderImageSplit.GetLeft();
imgIRequest *req = aPresContext->LoadBorderImage(aBorderStyle.GetBorderImage(), aForFrame);
nsCOMPtr<imgIContainer> image;
req->GetImage(getter_AddRefs(image));
nsSize imageSize;
image->GetWidth(&imageSize.width);
image->GetHeight(&imageSize.height);
imageSize.width = nsPresContext::CSSPixelsToAppUnits(imageSize.width);
imageSize.height = nsPresContext::CSSPixelsToAppUnits(imageSize.height);
// convert percentage values
NS_FOR_CSS_SIDES(side) {
borderImageSplitInt[side] = 0;
switch (borderImageSplit[side].GetUnit()) {
case eStyleUnit_Percent:
percent = borderImageSplit[side].GetPercentValue();
if (side == NS_SIDE_TOP || side == NS_SIDE_BOTTOM)
borderImageSplitInt[side] = (nscoord)(percent * imageSize.height);
else
borderImageSplitInt[side] = (nscoord)(percent * imageSize.width);
break;
case eStyleUnit_Integer:
borderImageSplitInt[side] = nsPresContext::CSSPixelsToAppUnits(borderImageSplit[side].
GetIntValue());
break;
case eStyleUnit_Factor:
borderImageSplitInt[side] = nsPresContext::CSSPixelsToAppUnits(borderImageSplit[side].GetFactorValue());
break;
default:
break;
}
}
gfxContext *thebesCtx = aRenderingContext.ThebesContext();
nsCOMPtr<nsIDeviceContext> dc;
aRenderingContext.GetDeviceContext(*getter_AddRefs(dc));
NS_FOR_CSS_SIDES(side) {
borderImageSplitGfx[side] = nsPresContext::AppUnitsToFloatCSSPixels(borderImageSplitInt[side]);
}
borderTop = dc->AppUnitsToGfxUnits(border.top);
borderRight = dc->AppUnitsToGfxUnits(border.right);
borderBottom = dc->AppUnitsToGfxUnits(border.bottom);
borderLeft = dc->AppUnitsToGfxUnits(border.left);
gfxSize gfxImageSize;
gfxImageSize.width = nsPresContext::AppUnitsToFloatCSSPixels(imageSize.width);
gfxImageSize.height = nsPresContext::AppUnitsToFloatCSSPixels(imageSize.height);
nsRect outerRect(aBorderArea);
gfxRect rectToDraw,
rectToDrawSource;
gfxRect clipRect;
clipRect.pos.x = dc->AppUnitsToGfxUnits(outerRect.x);
clipRect.pos.y = dc->AppUnitsToGfxUnits(outerRect.y);
clipRect.size.width = dc->AppUnitsToGfxUnits(outerRect.width);
clipRect.size.height = dc->AppUnitsToGfxUnits(outerRect.height);
if (thebesCtx->UserToDevicePixelSnapped(clipRect))
clipRect = thebesCtx->DeviceToUser(clipRect);
thebesCtx->Save();
thebesCtx->PushGroup(gfxASurface::CONTENT_COLOR_ALPHA);
gfxSize middleSize(clipRect.size.width - (borderLeft + borderRight),
clipRect.size.height - (borderTop + borderBottom));
// middle size in source space
gfxIntSize middleSizeSource(gfxImageSize.width - (borderImageSplitGfx[NS_SIDE_RIGHT] + borderImageSplitGfx[NS_SIDE_LEFT]),
gfxImageSize.height - (borderImageSplitGfx[NS_SIDE_TOP] + borderImageSplitGfx[NS_SIDE_BOTTOM]));
gfxSize interSizeTop, interSizeBottom, interSizeLeft, interSizeRight,
interSizeMiddle;
gfxFloat topScale = borderTop/borderImageSplitGfx[NS_SIDE_TOP];
gfxFloat bottomScale = borderBottom/borderImageSplitGfx[NS_SIDE_BOTTOM];
gfxFloat leftScale = borderLeft/borderImageSplitGfx[NS_SIDE_LEFT];
gfxFloat rightScale = borderRight/borderImageSplitGfx[NS_SIDE_RIGHT];
gfxFloat middleScaleH,
middleScaleV;
// TODO: check for nan and properly check for inf
if (topScale != 0.0 && borderImageSplitGfx[NS_SIDE_TOP] != 0.0) {
middleScaleH = topScale;
} else if (bottomScale != 0.0 && borderImageSplitGfx[NS_SIDE_BOTTOM] != 0.0) {
middleScaleH = bottomScale;
} else {
middleScaleH = 1.0;
}
if (leftScale != 0.0 && borderImageSplitGfx[NS_SIDE_LEFT] != 0.0) {
middleScaleV = leftScale;
} else if (rightScale != 0.0 && borderImageSplitGfx[NS_SIDE_RIGHT] != 0.0) {
middleScaleV = rightScale;
} else {
middleScaleV = 1.0;
}
interSizeTop.height = borderTop;
interSizeTop.width = middleSizeSource.width*topScale;
interSizeBottom.height = borderBottom;
interSizeBottom.width = middleSizeSource.width*bottomScale;
interSizeLeft.width = borderLeft;
interSizeLeft.height = middleSizeSource.height*leftScale;
interSizeRight.width = borderRight;
interSizeRight.height = middleSizeSource.height*rightScale;
interSizeMiddle.width = middleSizeSource.width*middleScaleH;
interSizeMiddle.height = middleSizeSource.height*middleScaleV;
// draw top left corner
rectToDraw = clipRect;
rectToDraw.size.width = borderLeft;
rectToDraw.size.height = borderTop;
rectToDrawSource.pos.x = 0;
rectToDrawSource.pos.y = 0;
rectToDrawSource.size.width = borderImageSplitGfx[NS_SIDE_LEFT];
rectToDrawSource.size.height = borderImageSplitGfx[NS_SIDE_TOP];
DrawBorderImageSide(thebesCtx, dc, image,
rectToDraw, rectToDraw.size, rectToDrawSource,
NS_STYLE_BORDER_IMAGE_STRETCH, NS_STYLE_BORDER_IMAGE_STRETCH);
// draw top
rectToDraw = clipRect;
rectToDraw.pos.x += borderLeft;
rectToDraw.size.width = middleSize.width;
rectToDraw.size.height = borderTop;
rectToDrawSource.pos.x = borderImageSplitGfx[NS_SIDE_LEFT];
rectToDrawSource.pos.y = 0;
rectToDrawSource.size.width = middleSizeSource.width;
rectToDrawSource.size.height = borderImageSplitGfx[NS_SIDE_TOP];
DrawBorderImageSide(thebesCtx, dc, image,
rectToDraw, interSizeTop, rectToDrawSource,
aBorderStyle.mBorderImageHFill, NS_STYLE_BORDER_IMAGE_STRETCH);
// draw top right corner
rectToDraw = clipRect;
rectToDraw.pos.x += clipRect.size.width - borderRight;
rectToDraw.size.width = borderRight;
rectToDraw.size.height = borderTop;
rectToDrawSource.pos.x = gfxImageSize.width - borderImageSplitGfx[NS_SIDE_RIGHT];
rectToDrawSource.pos.y = 0;
rectToDrawSource.size.width = borderImageSplitGfx[NS_SIDE_RIGHT];
rectToDrawSource.size.height = borderImageSplitGfx[NS_SIDE_TOP];
DrawBorderImageSide(thebesCtx, dc, image,
rectToDraw, rectToDraw.size, rectToDrawSource,
NS_STYLE_BORDER_IMAGE_STRETCH, NS_STYLE_BORDER_IMAGE_STRETCH);
// draw right
rectToDraw = clipRect;
rectToDraw.pos.x += clipRect.size.width - borderRight;
rectToDraw.pos.y += borderTop;
rectToDraw.size.width = borderRight;
rectToDraw.size.height = middleSize.height;
rectToDrawSource.pos.x = gfxImageSize.width - borderImageSplitGfx[NS_SIDE_RIGHT];
rectToDrawSource.pos.y = borderImageSplitGfx[NS_SIDE_TOP];
rectToDrawSource.size.width = borderImageSplitGfx[NS_SIDE_RIGHT];
rectToDrawSource.size.height = middleSizeSource.height;
DrawBorderImageSide(thebesCtx, dc, image,
rectToDraw, interSizeRight, rectToDrawSource,
NS_STYLE_BORDER_IMAGE_STRETCH, aBorderStyle.mBorderImageVFill);
// draw bottom right corner
rectToDraw = clipRect;
rectToDraw.pos.x += clipRect.size.width - borderRight;
rectToDraw.pos.y += clipRect.size.height - borderBottom;
rectToDraw.size.width = borderRight;
rectToDraw.size.height = borderBottom;
rectToDrawSource.pos.x = gfxImageSize.width - borderImageSplitGfx[NS_SIDE_RIGHT];
rectToDrawSource.pos.y = gfxImageSize.height - borderImageSplitGfx[NS_SIDE_BOTTOM];
rectToDrawSource.size.width = borderImageSplitGfx[NS_SIDE_RIGHT];
rectToDrawSource.size.height = borderImageSplitGfx[NS_SIDE_BOTTOM];
DrawBorderImageSide(thebesCtx, dc, image,
rectToDraw, rectToDraw.size, rectToDrawSource,
NS_STYLE_BORDER_IMAGE_STRETCH, NS_STYLE_BORDER_IMAGE_STRETCH);
// draw bottom
rectToDraw = clipRect;
rectToDraw.pos.x += borderLeft;
rectToDraw.pos.y += clipRect.size.height - borderBottom;
rectToDraw.size.width = middleSize.width;
rectToDraw.size.height = borderBottom;
rectToDrawSource.pos.x = borderImageSplitGfx[NS_SIDE_LEFT];
rectToDrawSource.pos.y = gfxImageSize.height - borderImageSplitGfx[NS_SIDE_BOTTOM];
rectToDrawSource.size.width = middleSizeSource.width;
rectToDrawSource.size.height = borderImageSplitGfx[NS_SIDE_BOTTOM];
DrawBorderImageSide(thebesCtx, dc, image,
rectToDraw, interSizeBottom, rectToDrawSource,
aBorderStyle.mBorderImageHFill, NS_STYLE_BORDER_IMAGE_STRETCH);
// draw bottom left corner
rectToDraw = clipRect;
rectToDraw.pos.y += clipRect.size.height - borderBottom;
rectToDraw.size.width = borderLeft;
rectToDraw.size.height = borderBottom;
rectToDrawSource.pos.x = 0;
rectToDrawSource.pos.y = gfxImageSize.height - borderImageSplitGfx[NS_SIDE_BOTTOM];
rectToDrawSource.size.width = borderImageSplitGfx[NS_SIDE_LEFT];
rectToDrawSource.size.height = borderImageSplitGfx[NS_SIDE_BOTTOM];
DrawBorderImageSide(thebesCtx, dc, image,
rectToDraw, rectToDraw.size, rectToDrawSource,
NS_STYLE_BORDER_IMAGE_STRETCH, NS_STYLE_BORDER_IMAGE_STRETCH);
// draw left
rectToDraw = clipRect;
rectToDraw.pos.y += borderTop;
rectToDraw.size.width = borderLeft;
rectToDraw.size.height = middleSize.height;
rectToDrawSource.pos.x = 0;
rectToDrawSource.pos.y = borderImageSplitGfx[NS_SIDE_TOP];
rectToDrawSource.size.width = borderImageSplitGfx[NS_SIDE_LEFT];
rectToDrawSource.size.height = middleSizeSource.height;
DrawBorderImageSide(thebesCtx, dc, image,
rectToDraw, interSizeLeft, rectToDrawSource,
NS_STYLE_BORDER_IMAGE_STRETCH, aBorderStyle.mBorderImageVFill);
// Draw middle
rectToDraw = clipRect;
rectToDraw.pos.x += borderLeft;
rectToDraw.pos.y += borderTop;
rectToDraw.size.width = middleSize.width;
rectToDraw.size.height = middleSize.height;
rectToDrawSource.pos.x = borderImageSplitGfx[NS_SIDE_LEFT];
rectToDrawSource.pos.y = borderImageSplitGfx[NS_SIDE_TOP];
rectToDrawSource.size = middleSizeSource;
DrawBorderImageSide(thebesCtx, dc, image,
rectToDraw, interSizeMiddle, rectToDrawSource,
aBorderStyle.mBorderImageHFill, aBorderStyle.mBorderImageVFill);
thebesCtx->PopGroupToSource();
thebesCtx->SetOperator(gfxContext::OPERATOR_OVER);
thebesCtx->Paint();
thebesCtx->Restore();
}
static void
DrawBorderImageSide(gfxContext *aThebesContext,
nsIDeviceContext* aDeviceContext,
imgIContainer* aImage,
gfxRect& aDestRect,
gfxSize aInterSize, // non-ref to allow aliasing
gfxRect& aSourceRect,
PRUint8 aHFillType,
PRUint8 aVFillType)
{
if (aDestRect.size.width < 1.0 || aDestRect.size.height < 1.0 ||
aSourceRect.size.width < 1.0 || aSourceRect.size.height < 1.0) {
return;
}
gfxIntSize gfxSourceSize((PRInt32)aSourceRect.size.width,
(PRInt32)aSourceRect.size.height);
// where the actual border ends up being rendered
if (aThebesContext->UserToDevicePixelSnapped(aDestRect))
aDestRect = aThebesContext->DeviceToUser(aDestRect);
if (aThebesContext->UserToDevicePixelSnapped(aSourceRect))
aSourceRect = aThebesContext->DeviceToUser(aSourceRect);
if (aDestRect.size.height < 1.0 ||
aDestRect.size.width < 1.0)
return;
if (aInterSize.width < 1.0 ||
aInterSize.height < 1.0)
return;
// Surface will hold just the part of the source image specified by the aSourceRect
// but at a different size
nsRefPtr<gfxASurface> interSurface =
gfxPlatform::GetPlatform()->CreateOffscreenSurface(
gfxSourceSize, gfxASurface::ImageFormatARGB32);
gfxMatrix srcMatrix;
// Adjust the matrix scale for Step 1 of the spec
srcMatrix.Scale(aSourceRect.size.width/aInterSize.width,
aSourceRect.size.height/aInterSize.height);
{
nsCOMPtr<gfxIImageFrame> frame;
nsresult rv = aImage->GetCurrentFrame(getter_AddRefs(frame));
if(NS_FAILED(rv))
return;
nsCOMPtr<nsIImage> image;
image = do_GetInterface(frame);
if(!image)
return;
// surface for the whole image
nsRefPtr<gfxPattern> imagePattern;
rv = image->GetPattern(getter_AddRefs(imagePattern));
if(NS_FAILED(rv) || !imagePattern)
return;
gfxMatrix mat;
mat.Translate(aSourceRect.pos);
imagePattern->SetMatrix(mat);
// Straightforward blit - no resizing
nsRefPtr<gfxContext> srcCtx = new gfxContext(interSurface);
srcCtx->SetPattern(imagePattern);
srcCtx->SetOperator(gfxContext::OPERATOR_SOURCE);
srcCtx->Paint();
srcCtx = nsnull;
}
// offset to make the middle tile centered in the middle of the border
gfxPoint renderOffset(0, 0);
gfxSize rectSize(aDestRect.size);
aThebesContext->Save();
aThebesContext->Clip(aDestRect);
gfxFloat hScale(1.0), vScale(1.0);
nsRefPtr<gfxPattern> pattern = new gfxPattern(interSurface);
pattern->SetExtend(gfxPattern::EXTEND_PAD_EDGE);
switch (aHFillType) {
case NS_STYLE_BORDER_IMAGE_REPEAT:
renderOffset.x = (rectSize.width - aInterSize.width*NS_ceil(rectSize.width/aInterSize.width))*-0.5;
aDestRect.pos.x -= renderOffset.x;
pattern->SetExtend(gfxPattern::EXTEND_REPEAT);
break;
case NS_STYLE_BORDER_IMAGE_ROUND:
hScale = aInterSize.width*(NS_ceil(aDestRect.size.width/aInterSize.width)/aDestRect.size.width);
pattern->SetExtend(gfxPattern::EXTEND_REPEAT);
break;
case NS_STYLE_BORDER_IMAGE_STRETCH:
default:
hScale = aInterSize.width/aDestRect.size.width;
break;
}
switch (aVFillType) {
case NS_STYLE_BORDER_IMAGE_REPEAT:
renderOffset.y = (rectSize.height - aInterSize.height*NS_ceil(rectSize.height/aInterSize.height))*-0.5;
aDestRect.pos.y -= renderOffset.y;
pattern->SetExtend(gfxPattern::EXTEND_REPEAT);
break;
case NS_STYLE_BORDER_IMAGE_ROUND:
vScale = aInterSize.height*(NS_ceil(aDestRect.size.height/aInterSize.height)/aDestRect.size.height);
pattern->SetExtend(gfxPattern::EXTEND_REPEAT);
break;
case NS_STYLE_BORDER_IMAGE_STRETCH:
default:
vScale = aInterSize.height/aDestRect.size.height;
break;
}
// Adjust the matrix scale for Step 2 of the spec
srcMatrix.Scale(hScale,vScale);
pattern->SetMatrix(srcMatrix);
// render
aThebesContext->Translate(aDestRect.pos);
aThebesContext->SetPattern(pattern);
aThebesContext->NewPath();
aThebesContext->Rectangle(gfxRect(renderOffset, rectSize));
aThebesContext->SetOperator(gfxContext::OPERATOR_ADD);
aThebesContext->Fill();
aThebesContext->Restore();
}
static void
PaintBackgroundColor(nsPresContext* aPresContext,
nsIRenderingContext& aRenderingContext,
nsIFrame* aForFrame,
const nsRect& aBgClipArea,
const nsStyleBackground& aColor,
const nsStyleBorder& aBorder,
PRBool aCanPaintNonWhite)
{
// If we're only allowed to paint white, then don't bail out on transparent
// color if we're not completely transparent. See the corresponding check
// for whether we're allowed to paint background images in
// PaintBackgroundWithSC before the first call to PaintBackgroundColor.
if (NS_GET_A(aColor.mBackgroundColor) == 0 &&
(aCanPaintNonWhite || aColor.IsTransparent())) {
// nothing to paint
return;
}
nscolor color = aColor.mBackgroundColor;
if (!aCanPaintNonWhite) {
color = NS_RGB(255, 255, 255);
}
aRenderingContext.SetColor(color);
if (!nsLayoutUtils::HasNonZeroCorner(aBorder.mBorderRadius)) {
aRenderingContext.FillRect(aBgClipArea);
return;
}
gfxContext *ctx = aRenderingContext.ThebesContext();
// needed for our border thickness
nscoord appUnitsPerPixel = aPresContext->AppUnitsPerDevPixel();
nscoord borderRadii[8];
GetBorderRadiusTwips(aBorder.mBorderRadius, aForFrame->GetSize().width,
borderRadii);
// the bgClipArea is the outside
gfxRect oRect(RectToGfxRect(aBgClipArea, appUnitsPerPixel));
oRect.Round();
oRect.Condition();
if (oRect.IsEmpty())
return;
// convert the radii
gfxCornerSizes radii;
ComputePixelRadii(borderRadii, aBgClipArea,
aForFrame ? aForFrame->GetSkipSides() : 0,
appUnitsPerPixel, &radii);
// Add 1.0 to any border radii; if we don't, the border and background
// curves will combine to have fringing at the rounded corners. Since
// alpha is used for coverage, we have problems because the border and
// background should have identical coverage, and the border should
// overlay the background exactly. The way to avoid this is by using
// a supersampling scheme, but we don't have the mechanism in place to do
// this. So, this will do for now.
for (int i = 0; i < 4; i++) {
if (radii[i].width > 0.0)
radii[i].width += 1.0;
if (radii[i].height > 0.0)
radii[i].height += 1.0;
}
ctx->NewPath();
ctx->RoundedRectangle(oRect, radii);
ctx->Fill();
}
// 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 / (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 = PR_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;
PRUint8 ridgeGrooveSide = (horizontal) ? NS_SIDE_TOP : NS_SIDE_LEFT;
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;
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)
{
gfxRect rect =
GetTextDecorationRectInternal(aPt, aLineSize, aAscent, aOffset,
aDecoration, aStyle);
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 = PR_MAX(NS_round(aLineSize.height), 1.0);
PRBool contextIsSaved = PR_FALSE;
gfxFloat oldLineWidth;
nsRefPtr<gfxPattern> oldPattern;
switch (aStyle) {
case NS_STYLE_BORDER_STYLE_SOLID:
case NS_STYLE_BORDER_STYLE_DOUBLE:
oldLineWidth = aGfxContext->CurrentLineWidth();
oldPattern = aGfxContext->GetPattern();
break;
case NS_STYLE_BORDER_STYLE_DASHED: {
aGfxContext->Save();
contextIsSaved = PR_TRUE;
gfxFloat dashWidth = lineHeight * DOT_LENGTH * DASH_LENGTH;
gfxFloat dash[2] = { dashWidth, dashWidth };
aGfxContext->SetLineCap(gfxContext::LINE_CAP_BUTT);
aGfxContext->SetDash(dash, 2, 0.0);
break;
}
case NS_STYLE_BORDER_STYLE_DOTTED: {
aGfxContext->Save();
contextIsSaved = PR_TRUE;
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);
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 NS_STYLE_BORDER_STYLE_SOLID:
aGfxContext->NewPath();
aGfxContext->MoveTo(rect.TopLeft());
aGfxContext->LineTo(rect.TopRight());
aGfxContext->Stroke();
break;
case NS_STYLE_BORDER_STYLE_DOUBLE:
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 NS_STYLE_BORDER_STYLE_DOTTED:
case NS_STYLE_BORDER_STYLE_DASHED:
aGfxContext->NewPath();
aGfxContext->MoveTo(rect.TopLeft());
aGfxContext->LineTo(rect.TopRight());
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)
{
NS_ASSERTION(aPresContext, "aPresContext is null");
gfxRect rect =
GetTextDecorationRectInternal(gfxPoint(0, 0), aLineSize, aAscent, aOffset,
aDecoration, aStyle);
// 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;
}
static gfxRect
GetTextDecorationRectInternal(const gfxPoint& aPt,
const gfxSize& aLineSize,
const gfxFloat aAscent,
const gfxFloat aOffset,
const PRUint8 aDecoration,
const PRUint8 aStyle)
{
gfxRect r;
r.pos.x = NS_floor(aPt.x + 0.5);
r.size.width = NS_round(aLineSize.width);
gfxFloat basesize = NS_round(aLineSize.height);
basesize = PR_MAX(basesize, 1.0);
r.size.height = basesize;
if (aStyle == NS_STYLE_BORDER_STYLE_DOUBLE) {
gfxFloat gap = NS_round(basesize / 2.0);
gap = PR_MAX(gap, 1.0);
r.size.height = basesize * 2.0 + gap;
} else {
r.size.height = basesize;
}
gfxFloat baseline = NS_floor(aPt.y + aAscent + 0.5);
gfxFloat offset = 0;
switch (aDecoration) {
case NS_STYLE_TEXT_DECORATION_UNDERLINE:
offset = aOffset;
break;
case NS_STYLE_TEXT_DECORATION_OVERLINE:
offset = aOffset - basesize + r.Height();
break;
case NS_STYLE_TEXT_DECORATION_LINE_THROUGH: {
gfxFloat extra = NS_floor(r.Height() / 2.0 + 0.5);
extra = PR_MAX(extra, basesize);
offset = aOffset - basesize + extra;
break;
}
default:
NS_ERROR("Invalid decoration value!");
}
r.pos.y = baseline - NS_floor(offset + 0.5);
return r;
}
// -----
// nsContextBoxBlur
// -----
gfxContext*
nsContextBoxBlur::Init(const gfxRect& aRect, nscoord aBlurRadius,
PRInt32 aAppUnitsPerDevPixel,
gfxContext* aDestinationCtx,
const gfxRect& aDirtyRect)
{
mDestinationCtx = aDestinationCtx;
PRInt32 blurRadius = static_cast<PRInt32>(aBlurRadius / aAppUnitsPerDevPixel);
// if not blurring, draw directly onto the destination device
if (blurRadius <= 0) {
mContext = aDestinationCtx;
return mContext;
}
// Convert from app units to device pixels
gfxRect rect = aRect;
rect.ScaleInverse(aAppUnitsPerDevPixel);
if (rect.IsEmpty()) {
mContext = aDestinationCtx;
return mContext;
}
gfxRect dirtyRect = aDirtyRect;
dirtyRect.ScaleInverse(aAppUnitsPerDevPixel);
gfxRect rectWithBlur = rect;
rectWithBlur.Outset(blurRadius);
// Determine the area of the shadow we need.
mRequiredShadowArea = dirtyRect.Intersect(rectWithBlur);
mDestinationCtx = aDestinationCtx;
// XXX the temporary surface will be the mRequiredShadowArea inflated by
// blurRadius in each direction so that the required shadow pixels are computed
// correctly. We could actually use a smaller temporary surface by observing
// that where the temporary surface is outside the rectWithBlur, the pixel
// values are guaranteed to be fully transparent, so we could intersect the
// inflated mRequiredShadowArea with rectWithBlur to compute the temporary
// surface area. But we're not doing that right now because it's more complex to do.
mContext = blur.Init(mRequiredShadowArea, gfxIntSize(blurRadius, blurRadius));
return mContext;
}
void
nsContextBoxBlur::DoPaint()
{
if (mContext == mDestinationCtx)
return;
mDestinationCtx->Save();
mDestinationCtx->NewPath();
mDestinationCtx->Rectangle(mRequiredShadowArea);
mDestinationCtx->Clip();
blur.Paint(mDestinationCtx);
mDestinationCtx->Restore();
}
gfxContext*
nsContextBoxBlur::GetContext()
{
return mContext;
}
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