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Bug 1225977 - fix DrawTargetSkia::MaskSurface with non-zero offset. r=jmuizelaar

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This commit is contained in:
Lee Salzman 2015-11-19 10:25:15 -05:00
parent 6968aac9f3
commit b8d98433fb
1 changed files with 10 additions and 6 deletions
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16
gfx/2d/DrawTargetSkia.cpp
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@ -656,16 +656,20 @@ DrawTargetSkia::MaskSurface(const Pattern &aSource,
TempBitmap bitmap = GetBitmapForSurface(aMask);
if (bitmap.mBitmap.colorType() == kAlpha_8_SkColorType) {
if (aOffset != Point(0, 0)) {
SkMatrix transform;
transform.setTranslate(SkFloatToScalar(-aOffset.x), SkFloatToScalar(-aOffset.y));
SkShader* matrixShader = SkShader::CreateLocalMatrixShader(paint.mPaint.getShader(), transform);
SkSafeUnref(paint.mPaint.setShader(matrixShader));
}
mCanvas->drawBitmap(bitmap.mBitmap, aOffset.x, aOffset.y, &paint.mPaint);
} else {
SkPaint maskPaint;
TempBitmap tmpBitmap;
SetPaintPattern(maskPaint, SurfacePattern(aMask, ExtendMode::CLAMP), tmpBitmap);
SkMatrix transform = maskPaint.getShader()->getLocalMatrix();
transform.postTranslate(SkFloatToScalar(aOffset.x), SkFloatToScalar(aOffset.y));
SkShader* matrixShader = SkShader::CreateLocalMatrixShader(maskPaint.getShader(), transform);
SkSafeUnref(maskPaint.setShader(matrixShader));
SetPaintPattern(maskPaint,
SurfacePattern(aMask, ExtendMode::CLAMP, Matrix::Translation(aOffset)),
tmpBitmap);
SkLayerRasterizer::Builder builder;
builder.addLayer(maskPaint);