gecko/layout/base/nsCSSRendering.cpp

3125 lines
114 KiB
C++
Raw Normal View History

/* -*- 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 "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();
}
};
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;
}
// Draw a line, skipping that portion which crosses aGap. aGap defines a rectangle gap
// This services fieldset legends and only works for coords defining horizontal lines.
void nsCSSRendering::DrawLine (nsIRenderingContext& aContext,
nscoord aX1, nscoord aY1, nscoord aX2, nscoord aY2,
nsRect* aGap)
{
if (nsnull == aGap) {
aContext.DrawLine(aX1, aY1, aX2, aY2);
} else {
nscoord x1 = (aX1 < aX2) ? aX1 : aX2;
nscoord x2 = (aX1 < aX2) ? aX2 : aX1;
nsPoint gapUpperRight(aGap->x + aGap->width, aGap->y);
nsPoint gapLowerRight(aGap->x + aGap->width, aGap->y + aGap->height);
if ((aGap->y <= aY1) && (gapLowerRight.y >= aY2)) {
if ((aGap->x > x1) && (aGap->x < x2)) {
aContext.DrawLine(x1, aY1, aGap->x, aY1);
}
if ((gapLowerRight.x > x1) && (gapLowerRight.x < x2)) {
aContext.DrawLine(gapUpperRight.x, aY2, x2, aY2);
}
} else {
aContext.DrawLine(aX1, aY1, aX2, aY2);
}
}
}
// Fill a polygon, skipping that portion which crosses aGap. aGap defines a rectangle gap
// This services fieldset legends and only works for points defining a horizontal rectangle
void nsCSSRendering::FillPolygon (nsIRenderingContext& aContext,
const nsPoint aPoints[],
PRInt32 aNumPoints,
nsRect* aGap)
{
if (nsnull == aGap) {
aContext.FillPolygon(aPoints, aNumPoints);
} else if (4 == aNumPoints) {
nsPoint gapUpperRight(aGap->x + aGap->width, aGap->y);
nsPoint gapLowerRight(aGap->x + aGap->width, aGap->y + aGap->height);
// sort the 4 points by x
nsPoint points[4];
for (PRInt32 pX = 0; pX < 4; pX++) {
points[pX] = aPoints[pX];
}
for (PRInt32 i = 0; i < 3; i++) {
for (PRInt32 j = i+1; j < 4; j++) {
if (points[j].x < points[i].x) {
nsPoint swap = points[i];
points[i] = points[j];
points[j] = swap;
}
}
}
nsPoint upperLeft = (points[0].y <= points[1].y) ? points[0] : points[1];
nsPoint lowerLeft = (points[0].y <= points[1].y) ? points[1] : points[0];
nsPoint upperRight = (points[2].y <= points[3].y) ? points[2] : points[3];
nsPoint lowerRight = (points[2].y <= points[3].y) ? points[3] : points[2];
if ((aGap->y <= upperLeft.y) && (gapLowerRight.y >= lowerRight.y)) {
if ((aGap->x > upperLeft.x) && (aGap->x < upperRight.x)) {
nsPoint leftRect[4];
leftRect[0] = upperLeft;
leftRect[1] = nsPoint(aGap->x, upperLeft.y);
leftRect[2] = nsPoint(aGap->x, lowerLeft.y);
leftRect[3] = lowerLeft;
aContext.FillPolygon(leftRect, 4);
}
if ((gapUpperRight.x > upperLeft.x) && (gapUpperRight.x < upperRight.x)) {
nsPoint rightRect[4];
rightRect[0] = nsPoint(gapUpperRight.x, upperRight.y);
rightRect[1] = upperRight;
rightRect[2] = lowerRight;
rightRect[3] = nsPoint(gapLowerRight.x, lowerRight.y);
aContext.FillPolygon(rightRect, 4);
}
} else {
aContext.FillPolygon(aPoints, aNumPoints);
}
}
}
/**
* Make a bevel color
*/
nscolor nsCSSRendering::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;
}
nscolor
nsCSSRendering::TransformColor(nscolor aMapColor,PRBool aNoBackGround)
{
PRUint16 hue,sat,value;
nscolor newcolor;
newcolor = aMapColor;
if (PR_TRUE == aNoBackGround){
// convert the RBG to HSV so we can get the lightness (which is the v)
NS_RGB2HSV(newcolor,hue,sat,value);
// The goal here is to send white to black while letting colored
// stuff stay colored... So we adopt the following approach.
// Something with sat = 0 should end up with value = 0. Something
// with a high sat can end up with a high value and it's ok.... At
// the same time, we don't want to make things lighter. Do
// something simple, since it seems to work.
if (value > sat) {
value = sat;
// convert this color back into the RGB color space.
NS_HSV2RGB(newcolor,hue,sat,value);
}
}
return newcolor;
}
//----------------------------------------------------------------------
// 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,
* otherwise the resulting radius is the smaller of the specified
* radius and half of each adjacent side's length.
*/
static void
ComputePixelRadii(const nscoord *aTwipsRadii,
const nsRect& outerRect,
const nsMargin& borderMargin,
PRIntn skipSides,
nscoord twipsPerPixel,
gfxCornerSizes *oBorderRadii)
{
nscoord twipsRadii[4] = { aTwipsRadii[0], aTwipsRadii[1], aTwipsRadii[2], aTwipsRadii[3] };
nsMargin border(borderMargin);
if (skipSides & SIDE_BIT_TOP) {
border.top = 0;
twipsRadii[C_TL] = 0;
twipsRadii[C_TR] = 0;
}
if (skipSides & SIDE_BIT_RIGHT) {
border.right = 0;
twipsRadii[C_TR] = 0;
twipsRadii[C_BR] = 0;
}
if (skipSides & SIDE_BIT_BOTTOM) {
border.bottom = 0;
twipsRadii[C_BR] = 0;
twipsRadii[C_BL] = 0;
}
if (skipSides & SIDE_BIT_LEFT) {
border.left = 0;
twipsRadii[C_BL] = 0;
twipsRadii[C_TL] = 0;
}
nsRect innerRect(outerRect);
innerRect.Deflate(border);
// make sure the corner radii don't get too big
nsMargin maxRadiusSize(innerRect.width/2 + border.left,
innerRect.height/2 + border.top,
innerRect.width/2 + border.right,
innerRect.height/2 + border.bottom);
gfxFloat f[4];
f[C_TL] = gfxFloat(PR_MIN(twipsRadii[C_TL], PR_MIN(maxRadiusSize.top, maxRadiusSize.left))) / twipsPerPixel;
f[C_TR] = gfxFloat(PR_MIN(twipsRadii[C_TR], PR_MIN(maxRadiusSize.top, maxRadiusSize.right))) / twipsPerPixel;
f[C_BL] = gfxFloat(PR_MIN(twipsRadii[C_BL], PR_MIN(maxRadiusSize.bottom, maxRadiusSize.left))) / twipsPerPixel;
f[C_BR] = gfxFloat(PR_MIN(twipsRadii[C_BR], PR_MIN(maxRadiusSize.bottom, maxRadiusSize.right))) / twipsPerPixel;
(*oBorderRadii)[C_TL] = gfxSize(f[C_TL], f[C_TL]);
(*oBorderRadii)[C_TR] = gfxSize(f[C_TR], f[C_TR]);
(*oBorderRadii)[C_BL] = gfxSize(f[C_BL], f[C_BL]);
(*oBorderRadii)[C_BR] = gfxSize(f[C_BR], f[C_BR]);
}
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[4];
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, border, aSkipSides, twipsPerPixel, &borderRadii);
PRUint8 borderStyles[4];
nscolor borderColors[4];
nsBorderColors *compositeColors[4];
// pull out styles, colors, composite colors
NS_FOR_CSS_SIDES (i) {
PRBool transparent, foreground;
borderStyles[i] = aBorderStyle.GetBorderStyle(i);
aBorderStyle.GetBorderColor(i, borderColors[i], transparent, foreground);
aBorderStyle.GetCompositeColors(i, &compositeColors[i]);
if (transparent)
borderColors[i] = 0x0;
else 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();
}
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[4];
// 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);
nscoord offset;
aOutlineStyle.GetOutlineOffset(offset);
// 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 overflowArea;
if (frameForArea == aForFrame) {
overflowArea = aForFrame->GetOverflowRect();
} 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(frameForArea->GetOverflowRect() +
frameForArea->GetOffsetTo(aForFrame));
nscoord delta = PR_MAX(offset + width, 0);
r.Inflate(delta, delta);
overflowArea.UnionRect(overflowArea, r);
}
}
nsRect outerRect(overflowArea + aBorderArea.TopLeft());
nsRect innerRect(outerRect);
if (width + offset >= 0) {
// the overflow area is exactly the outside edge of the outline
innerRect.Deflate(width, width);
} else {
// the overflow area is exactly the rectangle containing the frame and its
// children; we can compute the outline directly
innerRect.Deflate(-offset, -offset);
if (innerRect.width < 0 || innerRect.height < 0) {
return; // Protect against negative outline sizes
}
outerRect = innerRect;
outerRect.Inflate(width, width);
}
// 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;
}
// 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, outlineMargin, 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[4] = { 0, 0, 0, 0 };
nsMargin focusMargin(oneCSSPixel, oneCSSPixel, oneCSSPixel, oneCSSPixel);
ComputePixelRadii(twipsRadii, aFocusRect, focusMargin, 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
//----------------------------------------------------------------------
//----------------------------------------------------------------------
// Returns the anchor point to use for the background image. The
// anchor point is the (x, y) location where the first tile should
// be placed
//
// For repeated tiling, the anchor values are normalized wrt to the upper-left
// edge of the bounds, and are always in the range:
// -(aTileWidth - 1) <= anchor.x <= 0
// -(aTileHeight - 1) <= anchor.y <= 0
//
// i.e., they are either 0 or a negative number whose absolute value is
// less than the tile size in that dimension
//
// aOriginBounds is the box to which the tiling position should be relative
// aClipBounds is the box in which the tiling will actually be done
// They should correspond to 'background-origin' and 'background-clip',
// except when painting on the canvas, in which case the origin bounds
// should be the bounds of the root element's frame and the clip bounds
// should be the bounds of the canvas frame.
static void
ComputeBackgroundAnchorPoint(const nsStyleBackground& aColor,
const nsRect& aOriginBounds,
const nsRect& aClipBounds,
nscoord aTileWidth, nscoord aTileHeight,
nsPoint& aResult)
{
nscoord x;
if (NS_STYLE_BG_X_POSITION_LENGTH & aColor.mBackgroundFlags) {
x = aColor.mBackgroundXPosition.mCoord;
}
else if (NS_STYLE_BG_X_POSITION_PERCENT & aColor.mBackgroundFlags) {
PRFloat64 percent = PRFloat64(aColor.mBackgroundXPosition.mFloat);
nscoord tilePos = nscoord(percent * PRFloat64(aTileWidth));
nscoord boxPos = nscoord(percent * PRFloat64(aOriginBounds.width));
x = boxPos - tilePos;
}
else {
x = 0;
}
x += aOriginBounds.x - aClipBounds.x;
if (NS_STYLE_BG_REPEAT_X & aColor.mBackgroundRepeat) {
// When we are tiling in the x direction the loop will run from
// the left edge of the box to the right edge of the box. We need
// to adjust the starting coordinate to lie within the band being
// rendered.
if (x < 0) {
x = -x;
if (x < 0) {
// Some joker gave us max-negative-integer.
x = 0;
}
x %= aTileWidth;
x = -x;
}
else if (x != 0) {
x %= aTileWidth;
if (x > 0) {
x = x - aTileWidth;
}
}
NS_POSTCONDITION((x >= -(aTileWidth - 1)) && (x <= 0), "bad computed anchor value");
}
aResult.x = x;
nscoord y;
if (NS_STYLE_BG_Y_POSITION_LENGTH & aColor.mBackgroundFlags) {
y = aColor.mBackgroundYPosition.mCoord;
}
else if (NS_STYLE_BG_Y_POSITION_PERCENT & aColor.mBackgroundFlags){
PRFloat64 percent = PRFloat64(aColor.mBackgroundYPosition.mFloat);
nscoord tilePos = nscoord(percent * PRFloat64(aTileHeight));
nscoord boxPos = nscoord(percent * PRFloat64(aOriginBounds.height));
y = boxPos - tilePos;
}
else {
y = 0;
}
y += aOriginBounds.y - aClipBounds.y;
if (NS_STYLE_BG_REPEAT_Y & aColor.mBackgroundRepeat) {
// When we are tiling in the y direction the loop will run from
// the top edge of the box to the bottom edge of the box. We need
// to adjust the starting coordinate to lie within the band being
// rendered.
if (y < 0) {
y = -y;
if (y < 0) {
// Some joker gave us max-negative-integer.
y = 0;
}
y %= aTileHeight;
y = -y;
}
else if (y != 0) {
y %= aTileHeight;
if (y > 0) {
y = y - aTileHeight;
}
}
NS_POSTCONDITION((y >= -(aTileHeight - 1)) && (y <= 0), "bad computed anchor value");
}
aResult.y = y;
}
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 (0 == (result->mBackgroundFlags & NS_STYLE_BG_COLOR_TRANSPARENT))
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.
*/
2008-08-07 20:34:43 -07:00
// Returns nsnull if aFrame is not a canvas frame.
// Otherwise, it returns the frame we should look for the background on.
// This is normally aFrame but if aFrame is the viewport, we need to
// look for the background starting at the scroll root (which shares
// style context with the document root) or the document root itself.
// 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.
2008-08-07 20:34:43 -07:00
inline nsIFrame*
IsCanvasFrame(nsIFrame *aFrame)
{
nsIAtom* frameType = aFrame->GetType();
2008-08-07 20:34:43 -07:00
if (frameType == nsGkAtoms::canvasFrame ||
frameType == nsGkAtoms::rootFrame ||
frameType == nsGkAtoms::pageFrame ||
frameType == nsGkAtoms::pageContentFrame) {
return aFrame;
} else if (frameType == nsGkAtoms::viewportFrame) {
nsIFrame* firstChild = aFrame->GetFirstChild(nsnull);
if (firstChild) {
return firstChild;
}
}
return nsnull;
}
inline PRBool
2008-08-07 20:34:43 -07:00
FindCanvasBackground(nsIFrame* aForFrame,
const nsStyleBackground** aBackground)
{
2008-08-07 20:34:43 -07:00
// XXXldb What if the root element is positioned, etc.? (We don't
// allow that yet, do we?)
nsIFrame *firstChild = aForFrame->GetFirstChild(nsnull);
if (firstChild) {
const nsStyleBackground* result = firstChild->GetStyleBackground();
nsIFrame* topFrame = aForFrame;
if (firstChild->GetType() == nsGkAtoms::pageContentFrame) {
topFrame = firstChild->GetFirstChild(nsnull);
NS_ASSERTION(topFrame,
"nsPageContentFrame is missing a normal flow child");
if (!topFrame) {
return PR_FALSE;
}
NS_ASSERTION(topFrame->GetContent(),
"nsPageContentFrame child without content");
result = topFrame->GetStyleBackground();
}
// Check if we need to do propagation from BODY rather than HTML.
if (result->IsTransparent()) {
2008-08-07 20:34:43 -07:00
nsIContent* content = topFrame->GetContent();
if (content) {
// 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
2008-08-07 20:34:43 -07:00
FindElementBackground(nsIFrame* aForFrame,
const nsStyleBackground** aBackground)
{
2008-08-07 20:34:43 -07:00
nsIFrame *parentFrame = aForFrame->GetParent();
// XXXldb We shouldn't have to null-check |parentFrame| here.
if (parentFrame && IsCanvasFrame(parentFrame) == parentFrame) {
// Check that we're really the root (rather than in another child list).
nsIFrame *childFrame = parentFrame->GetFirstChild(nsnull);
if (childFrame == aForFrame)
return PR_FALSE; // Background was already drawn for the canvas.
}
*aBackground = aForFrame->GetStyleBackground();
// Return true unless the frame is for a BODY element whose background
// was propagated to the viewport.
if (aForFrame->GetStyleContext()->GetPseudoType())
return PR_TRUE; // A pseudo-element frame.
2008-08-07 20:34:43 -07:00
nsIContent* content = aForFrame->GetContent();
if (!content || !content->IsNodeOfType(nsINode::eHTML))
return PR_TRUE; // not frame for an HTML element
if (!parentFrame)
return PR_TRUE; // no parent to look at
if (content->Tag() != nsGkAtoms::body)
return PR_TRUE; // not frame for <BODY> element
// 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
2008-08-07 20:34:43 -07:00
const nsStyleBackground* htmlBG = parentFrame->GetStyleBackground();
return !htmlBG->IsTransparent();
}
PRBool
nsCSSRendering::FindBackground(nsPresContext* aPresContext,
nsIFrame* aForFrame,
const nsStyleBackground** aBackground,
PRBool* aIsCanvas)
{
2008-08-07 20:34:43 -07:00
nsIFrame* canvasFrame = IsCanvasFrame(aForFrame);
*aIsCanvas = canvasFrame != nsnull;
return canvasFrame
? FindCanvasBackground(canvasFrame, aBackground)
: FindElementBackground(aForFrame, aBackground);
}
void
nsCSSRendering::DidPaint()
{
gInlineBGData->Reset();
}
/* static */ PRBool
nsCSSRendering::GetBorderRadiusTwips(const nsStyleSides& aBorderRadius,
const nscoord& aFrameWidth,
nscoord aTwipsRadii[4])
{
nsStyleCoord bordStyleRadius[4];
PRBool result = PR_FALSE;
bordStyleRadius[gfxCorner::TOP_LEFT] = aBorderRadius.GetTop();
bordStyleRadius[gfxCorner::TOP_RIGHT] = aBorderRadius.GetRight();
bordStyleRadius[gfxCorner::BOTTOM_RIGHT] = aBorderRadius.GetBottom();
bordStyleRadius[gfxCorner::BOTTOM_LEFT] = aBorderRadius.GetLeft();
// Convert percentage values
for (int i = 0; i < 4; i++) {
aTwipsRadii[i] = 0;
float percent;
switch (bordStyleRadius[i].GetUnit()) {
case eStyleUnit_Percent:
percent = bordStyleRadius[i].GetPercentValue();
aTwipsRadii[i] = (nscoord)(percent * aFrameWidth);
break;
case eStyleUnit_Coord:
aTwipsRadii[i] = bordStyleRadius[i].GetCoordValue();
break;
default:
break;
}
if (aTwipsRadii[i])
result = PR_TRUE;
}
return result;
}
void
nsCSSRendering::PaintBoxShadow(nsPresContext* aPresContext,
nsIRenderingContext& aRenderingContext,
nsIFrame* aForFrame,
const nsPoint& aForFramePt)
{
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[4];
PRBool hasBorderRadius = GetBorderRadiusTwips(styleBorder->mBorderRadius, frameRect.width, twipsRadii);
nscoord twipsPerPixel = aPresContext->DevPixelsToAppUnits(1);
gfxCornerSizes borderRadii;
ComputePixelRadii(twipsRadii, frameRect, borderValues, sidesToSkip, twipsPerPixel, &borderRadii);
gfxRect frameGfxRect = RectToGfxRect(frameRect, 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.GetCoordValue(),
shadowItem->mYOffset.GetCoordValue()));
shadowRect.Outset(shadowItem->mSpread.GetCoordValue());
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.GetCoordValue();
shadowRectPlusBlur.Outset(blurRadius);
shadowRectPlusBlur.ScaleInverse(twipsPerPixel);
shadowRectPlusBlur.RoundOut();
gfxContext* renderContext = aRenderingContext.ThebesContext();
nsRefPtr<gfxContext> shadowContext;
nsContextBoxBlur blurringArea;
// shadowRect has already been converted to device pixels, pass 1 as the appunits/pixel value
blurRadius /= twipsPerPixel;
shadowContext = blurringArea.Init(shadowRect, blurRadius, 1, renderContext);
if (!shadowContext)
return;
// 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,
const nsStyleBorder& aBorder,
const nsStylePadding& aPadding,
PRBool aUsePrintSettings,
nsRect* aBGClipRect)
{
NS_PRECONDITION(aForFrame,
"Frame is expected to be provided to PaintBackground");
PRBool isCanvas;
const nsStyleBackground *color;
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, aBorder,
aPadding, aUsePrintSettings, aBGClipRect);
return;
}
nsStyleBackground canvasColor(*color);
nsIViewManager* vm = aPresContext->GetViewManager();
if (canvasColor.mBackgroundFlags & NS_STYLE_BG_COLOR_TRANSPARENT) {
nsIView* rootView;
vm->GetRootView(rootView);
if (!rootView->GetParent()) {
PRBool widgetIsTransparent = PR_FALSE;
if (rootView->HasWidget()) {
rootView->GetWidget()->GetHasTransparentBackground(widgetIsTransparent);
}
if (!widgetIsTransparent) {
// Ensure that we always paint a color for the root (in case there's
// no background at all or a partly transparent image).
canvasColor.mBackgroundFlags &= ~NS_STYLE_BG_COLOR_TRANSPARENT;
canvasColor.mBackgroundColor = aPresContext->DefaultBackgroundColor();
}
}
}
vm->SetDefaultBackgroundColor(canvasColor.mBackgroundColor);
PaintBackgroundWithSC(aPresContext, aRenderingContext, aForFrame,
aDirtyRect, aBorderArea, canvasColor,
aBorder, aPadding, aUsePrintSettings, aBGClipRect);
}
inline nscoord IntDivFloor(nscoord aDividend, nscoord aDivisor)
{
NS_PRECONDITION(aDivisor > 0,
"this function only works for positive divisors");
// ANSI C, ISO 9899:1999 section 6.5.5 defines integer division as
// truncation of the result towards zero. Earlier C standards, as
// well as the C++ standards (1998 and 2003) do not, but we depend
// on it elsewhere.
return (aDividend < 0 ? (aDividend - aDivisor + 1) : aDividend) / aDivisor;
}
inline nscoord IntDivCeil(nscoord aDividend, nscoord aDivisor)
{
NS_PRECONDITION(aDivisor > 0,
"this function only works for positive divisors");
// ANSI C, ISO 9899:1999 section 6.5.5 defines integer division as
// truncation of the result towards zero. Earlier C standards, as
// well as the C++ standards (1998 and 2003) do not, but we depend
// on it elsewhere.
return (aDividend > 0 ? (aDividend + aDivisor - 1) : aDividend) / aDivisor;
}
/**
* Return the largest 'v' such that v = aTileOffset + N*aTileSize, for some
* integer N, and v <= aDirtyStart.
*/
static nscoord
FindTileStart(nscoord aDirtyStart, nscoord aTileOffset, nscoord aTileSize)
{
// Find largest integer N such that aTileOffset + N*aTileSize <= aDirtyStart
return aTileOffset +
IntDivFloor(aDirtyStart - aTileOffset, aTileSize) * aTileSize;
}
/**
* Return the smallest 'v' such that v = aTileOffset + N*aTileSize, for some
* integer N, and v >= aDirtyEnd.
*/
static nscoord
FindTileEnd(nscoord aDirtyEnd, nscoord aTileOffset, nscoord aTileSize)
{
// Find smallest integer N such that aTileOffset + N*aTileSize >= aDirtyEnd
return aTileOffset +
IntDivCeil(aDirtyEnd - aTileOffset, aTileSize) * aTileSize;
}
static void
PixelSnapRectangle(gfxContext* aContext, nsIDeviceContext *aDC, nsRect& aRect)
{
gfxRect tmpRect;
tmpRect.pos.x = aDC->AppUnitsToGfxUnits(aRect.x);
tmpRect.pos.y = aDC->AppUnitsToGfxUnits(aRect.y);
tmpRect.size.width = aDC->AppUnitsToGfxUnits(aRect.width);
tmpRect.size.height = aDC->AppUnitsToGfxUnits(aRect.height);
if (aContext->UserToDevicePixelSnapped(tmpRect)) {
tmpRect = aContext->DeviceToUser(tmpRect);
aRect.x = aDC->GfxUnitsToAppUnits(tmpRect.pos.x);
aRect.y = aDC->GfxUnitsToAppUnits(tmpRect.pos.y);
aRect.width = aDC->GfxUnitsToAppUnits(tmpRect.XMost()) - aRect.x;
aRect.height = aDC->GfxUnitsToAppUnits(tmpRect.YMost()) - aRect.y;
}
}
static void
PixelSnapPoint(gfxContext* aContext, nsIDeviceContext *aDC, nsPoint& aPoint)
{
gfxRect tmpRect;
tmpRect.pos.x = aDC->AppUnitsToGfxUnits(aPoint.x);
tmpRect.pos.y = aDC->AppUnitsToGfxUnits(aPoint.y);
tmpRect.size.width = 0;
tmpRect.size.height = 0;
if (aContext->UserToDevicePixelSnapped(tmpRect)) {
tmpRect = aContext->DeviceToUser(tmpRect);
aPoint.x = aDC->GfxUnitsToAppUnits(tmpRect.pos.x);
aPoint.y = aDC->GfxUnitsToAppUnits(tmpRect.pos.y);
}
}
void
nsCSSRendering::PaintBackgroundWithSC(nsPresContext* aPresContext,
nsIRenderingContext& aRenderingContext,
nsIFrame* aForFrame,
const nsRect& aDirtyRect,
const nsRect& aBorderArea,
const nsStyleBackground& aColor,
const nsStyleBorder& aBorder,
const nsStylePadding& aPadding,
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;
}
}
nsRect bgClipArea;
if (aBGClipRect) {
bgClipArea = *aBGClipRect;
}
else {
// The background is rendered over the 'background-clip' area.
bgClipArea = aBorderArea;
if (aColor.mBackgroundClip != NS_STYLE_BG_CLIP_BORDER) {
NS_ASSERTION(aColor.mBackgroundClip == NS_STYLE_BG_CLIP_PADDING,
"unknown background-clip value");
nsMargin border = aForFrame->GetUsedBorder();
aForFrame->ApplySkipSides(border);
bgClipArea.Deflate(border);
}
}
nsIDeviceContext *dc = aPresContext->DeviceContext();
gfxContext *ctx = aRenderingContext.ThebesContext();
// Snap bgClipArea to device pixel boundaries. (We have to snap
// bgOriginArea below; if we don't do this as well then we could make
// incorrect decisions about various optimizations.)
PixelSnapRectangle(ctx, dc, bgClipArea);
// 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, aPadding, 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, aPadding, 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;
nsRect bgOriginArea;
nsIAtom* frameType = aForFrame->GetType();
if (frameType == nsGkAtoms::inlineFrame ||
frameType == nsGkAtoms::positionedInlineFrame) {
switch (aColor.mBackgroundInlinePolicy) {
case NS_STYLE_BG_INLINE_POLICY_EACH_BOX:
bgOriginArea = aBorderArea;
break;
case NS_STYLE_BG_INLINE_POLICY_BOUNDING_BOX:
bgOriginArea = gInlineBGData->GetBoundingRect(aForFrame) +
aBorderArea.TopLeft();
break;
default:
NS_ERROR("Unknown background-inline-policy value! "
"Please, teach me what to do.");
case NS_STYLE_BG_INLINE_POLICY_CONTINUOUS:
bgOriginArea = gInlineBGData->GetContinuousRect(aForFrame) +
aBorderArea.TopLeft();
break;
}
}
else {
bgOriginArea = aBorderArea;
}
// 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 = aForFrame->GetUsedBorder();
aForFrame->ApplySkipSides(border);
bgOriginArea.Deflate(border);
if (aColor.mBackgroundOrigin != NS_STYLE_BG_ORIGIN_PADDING) {
nsMargin padding = aForFrame->GetUsedPadding();
aForFrame->ApplySkipSides(padding);
bgOriginArea.Deflate(padding);
NS_ASSERTION(aColor.mBackgroundOrigin == NS_STYLE_BG_ORIGIN_CONTENT,
"unknown background-origin value");
}
}
// Snap bgOriginArea to device pixel boundaries to avoid variations in
// tiling when the subpixel position of the element changes.
PixelSnapRectangle(ctx, dc, bgOriginArea);
// Based on the repeat setting, compute how many tiles we should
// lay down for each axis. The value computed is the maximum based
// on the dirty rect before accounting for the background-position.
nscoord tileWidth = imageSize.width;
nscoord tileHeight = imageSize.height;
PRBool needBackgroundColor = !(aColor.mBackgroundFlags &
NS_STYLE_BG_COLOR_TRANSPARENT);
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, aPadding, canDrawBackgroundColor);
}
if ((tileWidth == 0) || (tileHeight == 0) || dirtyRect.IsEmpty()) {
// Nothing left to paint
return;
}
nsPoint borderAreaOriginSnapped = aBorderArea.TopLeft();
PixelSnapPoint(ctx, dc, borderAreaOriginSnapped);
// Compute the anchor point.
//
// When tiling, the anchor coordinate values will be negative offsets
// from the background-origin area.
// relative to the origin of aForFrame
nsPoint 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 = topFrame->GetRect();
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, viewportArea, tileWidth, tileHeight, anchor);
// Convert the anchor point from viewport coordinates to aForFrame
// coordinates.
anchor -= aForFrame->GetOffsetTo(topFrame);
} else {
if (frameType == nsGkAtoms::canvasFrame) {
// If the frame is the canvas, the image is placed relative to
// the root element's (first) frame (see bug 46446)
nsRect firstRootElementFrameArea;
nsIFrame* firstRootElementFrame = aForFrame->GetFirstChild(nsnull);
NS_ASSERTION(firstRootElementFrame, "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|.");
// temporary null check -- see bug 97226
if (firstRootElementFrame) {
firstRootElementFrameArea = firstRootElementFrame->GetRect();
// Take the border out of the frame's rect
const nsStyleBorder* borderStyle = firstRootElementFrame->GetStyleBorder();
firstRootElementFrameArea.Deflate(borderStyle->GetActualBorder());
// Get the anchor point
ComputeBackgroundAnchorPoint(aColor, firstRootElementFrameArea +
aBorderArea.TopLeft(), bgClipArea, tileWidth, tileHeight, anchor);
} else {
ComputeBackgroundAnchorPoint(aColor, bgOriginArea, bgClipArea, tileWidth, tileHeight, anchor);
}
} else {
// Otherwise, it is the normal case, and the background is
// simply placed relative to the frame's background-clip area
ComputeBackgroundAnchorPoint(aColor, bgOriginArea, bgClipArea, tileWidth, tileHeight, anchor);
}
// For scrolling attachment, the anchor is within the 'background-clip'
anchor.x += bgClipArea.x - borderAreaOriginSnapped.x;
anchor.y += bgClipArea.y - borderAreaOriginSnapped.y;
}
// Pixel-snap the anchor point so that we don't end up with blurry
// images due to subpixel positions. But round 0.5 down rather than
// up, since that's what we've always done. (And do that by just
// snapping the negative of the point.)
anchor.x = -anchor.x; anchor.y = -anchor.y;
PixelSnapPoint(ctx, dc, anchor);
anchor.x = -anchor.x; anchor.y = -anchor.y;
ctx->Save();
nscoord appUnitsPerPixel = aPresContext->DevPixelsToAppUnits(1);
ctx->NewPath();
ctx->Rectangle(RectToGfxRect(dirtyRect, appUnitsPerPixel), PR_TRUE);
ctx->Clip();
nscoord borderRadii[4];
PRBool haveRadius = GetBorderRadiusTwips(aBorder.mBorderRadius, aForFrame->GetSize().width, borderRadii);
if (haveRadius) {
gfxCornerSizes radii;
ComputePixelRadii(borderRadii, bgClipArea, aBorder.GetActualBorder(),
aForFrame ? aForFrame->GetSkipSides() : 0,
appUnitsPerPixel, &radii);
gfxRect oRect(RectToGfxRect(bgClipArea, appUnitsPerPixel));
oRect.Round();
oRect.Condition();
ctx->NewPath();
ctx->RoundedRectangle(oRect, radii);
ctx->Clip();
}
// Compute the x and y starting points and limits for tiling
/* An Overview Of The Following Logic
A........ . . . . . . . . . . . . . .
: +---:-------.-------.-------.---- /|\
: | : . . . | nh
:.......: . . . x . . . . . . . . . . \|/
. | . . . .
. | . . ########### .
. . . . . . . . . .#. . . . .#. . . .
. | . . ########### . /|\
. | . . . . | h
. . | . . . . . . . . . . . . . z . . \|/
. | . . . .
|<-----nw------>| |<--w-->|
---- = the background clip area edge. The painting is done within
to this area. If the background is positioned relative to the
viewport ('fixed') then this is the viewport edge.
.... = the primary tile.
. . = the other tiles.
#### = the dirtyRect. This is the minimum region we want to cover.
A = The anchor point. This is the point at which the tile should
start. Always negative or zero.
x = x0 and y0 in the code. The point at which tiling must start
so that the fewest tiles are laid out while completely
covering the dirtyRect area.
z = x1 and y1 in the code. The point at which tiling must end so
that the fewest tiles are laid out while completely covering
the dirtyRect area.
w = the width of the tile (tileWidth).
h = the height of the tile (tileHeight).
n = the number of whole tiles that fit between 'A' and 'x'.
(the vertical n and the horizontal n are different)
Therefore,
x0 = bgClipArea.x + anchor.x + n * tileWidth;
...where n is an integer greater or equal to 0 fitting:
n * tileWidth <=
dirtyRect.x - (bgClipArea.x + anchor.x) <=
(n+1) * tileWidth
...i.e.,
n <= (dirtyRect.x - (bgClipArea.x + anchor.x)) / tileWidth < n + 1
...which, treating the division as an integer divide rounding down, gives:
n = (dirtyRect.x - (bgClipArea.x + anchor.x)) / tileWidth
Substituting into the original expression for x0:
x0 = bgClipArea.x + anchor.x +
((dirtyRect.x - (bgClipArea.x + anchor.x)) / tileWidth) *
tileWidth;
From this x1 is determined,
x1 = x0 + m * tileWidth;
...where m is an integer greater than 0 fitting:
(m - 1) * tileWidth <
dirtyRect.x + dirtyRect.width - x0 <=
m * tileWidth
...i.e.,
m - 1 < (dirtyRect.x + dirtyRect.width - x0) / tileWidth <= m
...which, treating the division as an integer divide, and making it
round up, gives:
m = (dirtyRect.x + dirtyRect.width - x0 + tileWidth - 1) / tileWidth
Substituting into the original expression for x1:
x1 = x0 + ((dirtyRect.x + dirtyRect.width - x0 + tileWidth - 1) /
tileWidth) * tileWidth
The vertical case is analogous. If the background is fixed, then
bgClipArea.x and bgClipArea.y are set to zero when finding the parent
viewport, above.
*/
// relative to aBorderArea.TopLeft()
// ... but pixel-snapped, so that it comes out correctly relative to
// all the other pixel-snapped things
nsRect tileRect(anchor, nsSize(tileWidth, tileHeight));
if (repeat & NS_STYLE_BG_REPEAT_X) {
// When tiling in the x direction, adjust the starting position of the
// tile to account for dirtyRect.x. When tiling in x, the anchor.x value
// will be a negative value used to adjust the starting coordinate.
nscoord x0 = FindTileStart(dirtyRect.x - borderAreaOriginSnapped.x, anchor.x, tileWidth);
nscoord x1 = FindTileEnd(dirtyRect.XMost() - borderAreaOriginSnapped.x, anchor.x, tileWidth);
tileRect.x = x0;
tileRect.width = x1 - x0;
}
if (repeat & NS_STYLE_BG_REPEAT_Y) {
// When tiling in the y direction, adjust the starting position of the
// tile to account for dirtyRect.y. When tiling in y, the anchor.y value
// will be a negative value used to adjust the starting coordinate.
nscoord y0 = FindTileStart(dirtyRect.y - borderAreaOriginSnapped.y, anchor.y, tileHeight);
nscoord y1 = FindTileEnd(dirtyRect.YMost() - borderAreaOriginSnapped.y, anchor.y, tileHeight);
tileRect.y = y0;
tileRect.height = y1 - y0;
}
// Take the intersection again to paint only the required area.
nsRect absTileRect = tileRect + borderAreaOriginSnapped;
nsRect drawRect;
if (drawRect.IntersectRect(absTileRect, dirtyRect)) {
// Note that due to the way FindTileStart works we're guaranteed
// that drawRect overlaps the top-left-most tile when repeating.
NS_ASSERTION(drawRect.x >= absTileRect.x && drawRect.y >= absTileRect.y,
"Bogus intersection");
NS_ASSERTION(drawRect.x < absTileRect.x + tileWidth,
"Bogus x coord for draw rect");
NS_ASSERTION(drawRect.y < absTileRect.y + tileHeight,
"Bogus y coord for draw rect");
// Figure out whether we can get away with not tiling at all.
nsRect sourceRect = drawRect - absTileRect.TopLeft();
// Compute the subimage rectangle that we expect to be sampled.
// This is the tile rectangle, clipped to the bgClipArea, and then
// passed in relative to the image top-left.
nsRect destRect; // The rectangle we would draw ignoring dirty-rect
destRect.IntersectRect(absTileRect, bgClipArea);
nsRect subimageRect = destRect - borderAreaOriginSnapped - tileRect.TopLeft();
if (sourceRect.XMost() <= tileWidth && sourceRect.YMost() <= tileHeight) {
// The entire drawRect is contained inside a single tile; just
// draw the corresponding part of the image once.
nsLayoutUtils::DrawImage(&aRenderingContext, image,
destRect, drawRect, &subimageRect);
} else {
// Note that the subimage is in tile space so it may cover
// multiple tiles of the image.
subimageRect.ScaleRoundOutInverse(nsIDeviceContext::AppUnitsPerCSSPixel());
aRenderingContext.DrawTile(image, absTileRect.x, absTileRect.y,
&drawRect, &subimageRect);
}
}
ctx->Restore();
}
void
nsCSSRendering::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);
thebesCtx->UserToDevicePixelSnapped(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();
}
void
nsCSSRendering::DrawBorderImageSide(gfxContext *aThebesContext,
nsIDeviceContext* aDeviceContext,
imgIContainer* aImage,
gfxRect& aDestRect,
gfxSize& aInterSize,
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
aThebesContext->UserToDevicePixelSnapped(aDestRect);
aThebesContext->UserToDevicePixelSnapped(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);
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();
}
void
nsCSSRendering::PaintBackgroundColor(nsPresContext* aPresContext,
nsIRenderingContext& aRenderingContext,
nsIFrame* aForFrame,
const nsRect& aBgClipArea,
const nsStyleBackground& aColor,
const nsStyleBorder& aBorder,
const nsStylePadding& aPadding,
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 ((aColor.mBackgroundFlags & NS_STYLE_BG_COLOR_TRANSPARENT) &&
(aCanPaintNonWhite || aColor.IsTransparent())) {
// nothing to paint
return;
}
nscoord borderRadii[4];
nsRect bgClipArea(aBgClipArea);
GetBorderRadiusTwips(aBorder.mBorderRadius, aForFrame->GetSize().width, borderRadii);
PRUint8 side = 0;
// Rounded version of the border
for (side = 0; side < 4; ++side) {
if (borderRadii[side] > 0) {
PaintRoundedBackground(aPresContext, aRenderingContext, aForFrame,
bgClipArea, aColor, aBorder, borderRadii,
aCanPaintNonWhite);
return;
}
}
nscolor color;
if (!aCanPaintNonWhite) {
color = NS_RGB(255, 255, 255);
} else {
color = aColor.mBackgroundColor;
}
aRenderingContext.SetColor(color);
aRenderingContext.FillRect(bgClipArea);
}
/** ---------------------------------------------------
* See documentation in nsCSSRendering.h
* @update 3/26/99 dwc
*/
void
nsCSSRendering::PaintRoundedBackground(nsPresContext* aPresContext,
nsIRenderingContext& aRenderingContext,
nsIFrame* aForFrame,
const nsRect& aBgClipArea,
const nsStyleBackground& aColor,
const nsStyleBorder& aBorder,
nscoord aTheRadius[4],
PRBool aCanPaintNonWhite)
{
gfxContext *ctx = aRenderingContext.ThebesContext();
// needed for our border thickness
nscoord appUnitsPerPixel = aPresContext->AppUnitsPerDevPixel();
nscolor color = aColor.mBackgroundColor;
if (!aCanPaintNonWhite) {
color = NS_RGB(255, 255, 255);
}
aRenderingContext.SetColor(color);
// Adjust for background-clip, if necessary
if (aColor.mBackgroundClip != NS_STYLE_BG_CLIP_BORDER) {
NS_ASSERTION(aColor.mBackgroundClip == NS_STYLE_BG_CLIP_PADDING, "unknown background-clip value");
// Get the radius to the outer edge of the padding.
// -moz-border-radius is the radius to the outer edge of the border.
NS_FOR_CSS_SIDES(side) {
aTheRadius[side] -= aBorder.GetActualBorderWidth(side);
aTheRadius[side] = PR_MAX(aTheRadius[side], 0);
}
}
// the bgClipArea is the outside
gfxRect oRect(RectToGfxRect(aBgClipArea, appUnitsPerPixel));
oRect.Round();
oRect.Condition();
if (oRect.IsEmpty())
return;
// convert the radii
gfxCornerSizes radii;
nsMargin border = aBorder.GetActualBorder();
ComputePixelRadii(aTheRadius, aBgClipArea, border,
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->SetColor(gfxRGBA(color));
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;
}
gfxRect
nsCSSRendering::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
// -----
void
nsContextBoxBlur::BoxBlurHorizontal(unsigned char* aInput,
unsigned char* aOutput,
PRUint32 aLeftLobe,
PRUint32 aRightLobe)
{
// Box blur involves looking at one pixel, and setting its value to the average of
// its neighbouring pixels. leftLobe is how many pixels to the left to include
// in the average, rightLobe is to the right.
// boxSize is how many pixels total will be averaged when looking at each pixel.
PRUint32 boxSize = aLeftLobe + aRightLobe + 1;
long stride = mImageSurface->Stride();
PRUint32 rows = mRect.Height();
for (PRUint32 y = 0; y < rows; y++) {
PRUint32 alphaSum = 0;
for (PRUint32 i = 0; i < boxSize; i++) {
PRInt32 pos = i - aLeftLobe;
pos = PR_MAX(pos, 0);
pos = PR_MIN(pos, stride - 1);
alphaSum += aInput[stride * y + pos];
}
for (PRInt32 x = 0; x < stride; x++) {
PRInt32 tmp = x - aLeftLobe;
PRInt32 last = PR_MAX(tmp, 0);
PRInt32 next = PR_MIN(tmp + boxSize, stride - 1);
aOutput[stride * y + x] = alphaSum/boxSize;
alphaSum += aInput[stride * y + next] -
aInput[stride * y + last];
}
}
}
void
nsContextBoxBlur::BoxBlurVertical(unsigned char* aInput,
unsigned char* aOutput,
PRUint32 aTopLobe,
PRUint32 aBottomLobe)
{
PRUint32 boxSize = aTopLobe + aBottomLobe + 1;
long stride = mImageSurface->Stride();
PRUint32 rows = mRect.Height();
for (PRInt32 x = 0; x < stride; x++) {
PRUint32 alphaSum = 0;
for (PRUint32 i = 0; i < boxSize; i++) {
PRInt32 pos = i - aTopLobe;
pos = PR_MAX(pos, 0);
pos = PR_MIN(pos, rows - 1);
alphaSum += aInput[stride * pos + x];
}
for (PRUint32 y = 0; y < rows; y++) {
PRInt32 tmp = y - aTopLobe;
PRInt32 last = PR_MAX(tmp, 0);
PRInt32 next = PR_MIN(tmp + boxSize, rows - 1);
aOutput[stride * y + x] = alphaSum/boxSize;
alphaSum += aInput[stride * next + x] -
aInput[stride * last + x];
}
}
}
gfxContext*
nsContextBoxBlur::Init(const gfxRect& aRect, nscoord aBlurRadius,
PRInt32 aAppUnitsPerDevPixel,
gfxContext* aDestinationCtx)
{
mBlurRadius = aBlurRadius / aAppUnitsPerDevPixel;
if (mBlurRadius <= 0) {
mContext = aDestinationCtx;
return mContext;
}
// Convert from app units to device pixels
mRect = aRect;
mRect.Outset(aBlurRadius);
mRect.ScaleInverse(aAppUnitsPerDevPixel);
mRect.RoundOut();
if (mRect.IsEmpty()) {
mBlurRadius = 0;
mContext = aDestinationCtx;
return mContext;
}
mDestinationCtx = aDestinationCtx;
// Make an alpha-only surface to draw on. We will play with the data after everything is drawn
// to create a blur effect.
mImageSurface = new gfxImageSurface(gfxIntSize(mRect.Width(), mRect.Height()),
gfxASurface::ImageFormatA8);
if (!mImageSurface || mImageSurface->CairoStatus())
return nsnull;
// Use a device offset so callers don't need to worry about translating coordinates,
// they can draw as if this was part of the destination context at the coordinates
// of mRect.
mImageSurface->SetDeviceOffset(-mRect.TopLeft());
mContext = new gfxContext(mImageSurface);
return mContext;
}
void
nsContextBoxBlur::DoPaint()
{
if (mBlurRadius <= 0)
return;
unsigned char* boxData = mImageSurface->Data();
// A blur radius of 1 achieves nothing (1/2 = 0 in int terms),
// but we still want a blur!
mBlurRadius = PR_MAX(mBlurRadius, 2);
nsTArray<unsigned char> tempAlphaDataBuf;
if (!tempAlphaDataBuf.SetLength(mImageSurface->GetDataSize()))
return; // OOM
// Here we do like what the SVG gaussian blur filter does in calculating
// the lobes.
if (mBlurRadius & 1) {
// blur radius is odd
BoxBlurHorizontal(boxData, tempAlphaDataBuf.Elements(), mBlurRadius/2, mBlurRadius/2);
BoxBlurHorizontal(tempAlphaDataBuf.Elements(), boxData, mBlurRadius/2, mBlurRadius/2);
BoxBlurHorizontal(boxData, tempAlphaDataBuf.Elements(), mBlurRadius/2, mBlurRadius/2);
BoxBlurVertical(tempAlphaDataBuf.Elements(), boxData, mBlurRadius/2, mBlurRadius/2);
BoxBlurVertical(boxData, tempAlphaDataBuf.Elements(), mBlurRadius/2, mBlurRadius/2);
BoxBlurVertical(tempAlphaDataBuf.Elements(), boxData, mBlurRadius/2, mBlurRadius/2);
} else {
// blur radius is even
BoxBlurHorizontal(boxData, tempAlphaDataBuf.Elements(), mBlurRadius/2, mBlurRadius/2 - 1);
BoxBlurHorizontal(tempAlphaDataBuf.Elements(), boxData, mBlurRadius/2 - 1, mBlurRadius/2);
BoxBlurHorizontal(boxData, tempAlphaDataBuf.Elements(), mBlurRadius/2, mBlurRadius/2);
BoxBlurVertical(tempAlphaDataBuf.Elements(), boxData, mBlurRadius/2, mBlurRadius/2 - 1);
BoxBlurVertical(boxData, tempAlphaDataBuf.Elements(), mBlurRadius/2 - 1, mBlurRadius/2);
BoxBlurVertical(tempAlphaDataBuf.Elements(), boxData, mBlurRadius/2, mBlurRadius/2);
}
mDestinationCtx->Mask(mImageSurface);
}
gfxContext*
nsContextBoxBlur::GetContext()
{
return mContext;
}