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Bug 768775. For linear gradients where the gradient line is parallel to an axis and runs from one edge of a background tile to the other, we can repeat the background by just repeating the gradient instead of drawing individual tiles. r=jrmuizel

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This commit is contained in:
Robert O'Callahan 2012-07-02 11:46:32 +12:00
parent 348b690758
commit 1af8a8fb76
1 changed files with 17 additions and 4 deletions
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21
layout/base/nsCSSRendering.cpp
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@ -2009,6 +2009,7 @@ nsCSSRendering::PaintGradient(nsPresContext* aPresContext,
// Create the gradient pattern.
nsRefPtr<gfxPattern> gradientPattern;
bool forceRepeatToCoverTiles = false;
if (aGradient->mShape == NS_STYLE_GRADIENT_SHAPE_LINEAR) {
// Compute the actual gradient line ends we need to pass to cairo after
// stops have been normalized.
@ -2027,6 +2028,16 @@ nsCSSRendering::PaintGradient(nsPresContext* aPresContext,
gradientPattern = new gfxPattern(gradientStart.x, gradientStart.y,
gradientEnd.x, gradientEnd.y);
// When the gradient line is parallel to the x axis from the left edge
// to the right edge of a tile, then we can repeat by just repeating the
// gradient.
if ((gradientStart.y == gradientEnd.y && gradientStart.x == 0 &&
gradientEnd.x == oneCellArea.width) ||
(gradientStart.x == gradientEnd.x && gradientStart.y == 0 &&
gradientEnd.y == oneCellArea.height)) {
forceRepeatToCoverTiles = true;
}
} else {
NS_ASSERTION(firstStop >= 0.0,
"Negative stops not allowed for radial gradients");
@ -2077,7 +2088,7 @@ nsCSSRendering::PaintGradient(nsPresContext* aPresContext,
}
// Set repeat mode. Default cairo extend mode is PAD.
if (aGradient->mRepeating) {
if (aGradient->mRepeating || forceRepeatToCoverTiles) {
gradientPattern->SetExtend(gfxPattern::EXTEND_REPEAT);
}
@ -2096,8 +2107,9 @@ nsCSSRendering::PaintGradient(nsPresContext* aPresContext,
// xStart/yStart are the top-left corner of the top-left tile.
nscoord xStart = FindTileStart(dirty.x, aOneCellArea.x, aOneCellArea.width);
nscoord yStart = FindTileStart(dirty.y, aOneCellArea.y, aOneCellArea.height);
nscoord xEnd = dirty.XMost();
nscoord yEnd = dirty.YMost();
nscoord xEnd = forceRepeatToCoverTiles ? xStart + aOneCellArea.width : dirty.XMost();
nscoord yEnd = forceRepeatToCoverTiles ? yStart + aOneCellArea.height : dirty.YMost();
// x and y are the top-left corner of the tile to draw
for (nscoord y = yStart; y < yEnd; y += aOneCellArea.height) {
for (nscoord x = xStart; x < xEnd; x += aOneCellArea.width) {
@ -2107,7 +2119,8 @@ nsCSSRendering::PaintGradient(nsPresContext* aPresContext,
appUnitsPerPixel);
// The actual area to fill with this tile is the intersection of this
// tile with the overall area we're supposed to be filling
gfxRect fillRect = tileRect.Intersect(areaToFill);
gfxRect fillRect =
forceRepeatToCoverTiles ? areaToFill : tileRect.Intersect(areaToFill);
ctx->NewPath();
ctx->Translate(tileRect.TopLeft());
ctx->SetPattern(gradientPattern);