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Bug 538909. Correctly calculate index of top-left tile. r=dbaron

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This commit is contained in:
Robert O'Callahan 2010-01-14 15:30:05 +13:00
parent 40c40a3d2c
commit c20b3a582f
3 changed files with 46 additions and 5 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

15
layout/base/nsCSSRendering.cpp
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@ -1782,6 +1782,14 @@ InterpolateColor(const gfxRGBA& aC1, const gfxRGBA& aC2, double aFrac)
aC2.a*aFrac + aC1.a*other); aC2.a*aFrac + aC1.a*other);
} }
static nscoord
FindTileStart(nscoord aDirtyCoord, nscoord aTilePos, nscoord aTileDim)
{
NS_ASSERTION(aTileDim > 0, "Non-positive tile dimension");
double multiples = NS_floor(double(aDirtyCoord - aTilePos)/aTileDim);
return NSToCoordRound(multiples*aTileDim + aTilePos);
}
void void
nsCSSRendering::PaintGradient(nsPresContext* aPresContext, nsCSSRendering::PaintGradient(nsPresContext* aPresContext,
nsIRenderingContext& aRenderingContext, nsIRenderingContext& aRenderingContext,
@ -2027,12 +2035,9 @@ nsCSSRendering::PaintGradient(nsPresContext* aPresContext,
gfxRect areaToFill = RectToGfxRect(aFillArea, appUnitsPerPixel); gfxRect areaToFill = RectToGfxRect(aFillArea, appUnitsPerPixel);
gfxMatrix ctm = ctx->CurrentMatrix(); gfxMatrix ctm = ctx->CurrentMatrix();
// Compute which tile is the top-left tile to be drawn.
PRInt32 firstTileX = (dirty.x - aOneCellArea.x)/aOneCellArea.width;
PRInt32 firstTileY = (dirty.y - aOneCellArea.y)/aOneCellArea.height;
// xStart/yStart are the top-left corner of the top-left tile. // xStart/yStart are the top-left corner of the top-left tile.
nscoord xStart = firstTileX*aOneCellArea.width + aOneCellArea.x; nscoord xStart = FindTileStart(dirty.x, aOneCellArea.x, aOneCellArea.width);
nscoord yStart = firstTileY*aOneCellArea.height + aOneCellArea.y; nscoord yStart = FindTileStart(dirty.y, aOneCellArea.y, aOneCellArea.height);
nscoord xEnd = dirty.XMost(); nscoord xEnd = dirty.XMost();
nscoord yEnd = dirty.YMost(); nscoord yEnd = dirty.YMost();
// x and y are the top-left corner of the tile to draw // x and y are the top-left corner of the tile to draw

19
layout/reftests/bugs/538909-1-ref.html Normal file
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@ -0,0 +1,19 @@
<!DOCTYPE HTML>
<html>
<head>
<style>
div {
width: 260px;
height: 260px;
-moz-background-size: 100px;
background-size: 100px;
background-position: -20px -20px;
background-image: -moz-linear-gradient(left top, yellow, blue);
background-image: linear-gradient(left top, yellow, blue);
}
</style>
</head>
<body>
<div></div>
</body>
</html>

17
layout/reftests/bugs/538909-1.html Normal file
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@ -0,0 +1,17 @@
<!DOCTYPE HTML>
<html>
<head>
<style>
div {
border: 80px solid transparent;
width: 100px;
height: 100px;
background-image: -moz-linear-gradient(left top, yellow, blue);
background-image: linear-gradient(left top, yellow, blue);
}
</style>
</head>
<body>
<div></div>
</body>
</html>