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Fix GPU-only snapping bug in mask blur rendering

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The existing mask effect code in Ganesh is subject to snapping issues (when the created mask is redrawn). This artifact can be seen by rendering the original geometry (w/o blurs) and comparing that result to a rendering of the unblurred masks. W/o this patch the results do not match up (they are arbitrarily shifted by a pixel).

This patch will require rebaselining and suppressions.

Chromium layout tests suppressions are here:
https://codereview.chromium.org/1342683003/ (Add layout test suppressions for upcoming Skia roll)

Review URL: https://codereview.chromium.org/1338183002
This commit is contained in:
robertphillips 2015-09-14 11:18:13 -07:00 committed by Commit bot
parent efd50daa28
commit 3833daaa66
1 changed files with 13 additions and 7 deletions
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20
src/gpu/GrBlurUtils.cpp
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@ -97,15 +97,20 @@ static bool draw_with_mask_filter(GrDrawContext* drawContext,
// Create a mask of 'devPath' and place the result in 'mask'.
static GrTexture* create_mask_GPU(GrContext* context,
const SkRect& maskRect,
SkRect* maskRect,
const SkPath& devPath,
const GrStrokeInfo& strokeInfo,
bool doAA,
int sampleCnt) {
// This mask will ultimately be drawn as a non-AA rect (see draw_mask).
// Non-AA rects have a bad habit of snapping arbitrarily. Integerize here
// so the mask draws in a reproducible manner.
*maskRect = SkRect::Make(maskRect->roundOut());
GrSurfaceDesc desc;
desc.fFlags = kRenderTarget_GrSurfaceFlag;
desc.fWidth = SkScalarCeilToInt(maskRect.width());
desc.fHeight = SkScalarCeilToInt(maskRect.height());
desc.fWidth = SkScalarCeilToInt(maskRect->width());
desc.fHeight = SkScalarCeilToInt(maskRect->height());
desc.fSampleCnt = doAA ? sampleCnt : 0;
// We actually only need A8, but it often isn't supported as a
// render target so default to RGBA_8888
@ -120,7 +125,7 @@ static GrTexture* create_mask_GPU(GrContext* context,
return nullptr;
}
SkRect clipRect = SkRect::MakeWH(maskRect.width(), maskRect.height());
SkRect clipRect = SkRect::MakeWH(maskRect->width(), maskRect->height());
SkAutoTUnref<GrDrawContext> drawContext(context->drawContext());
if (!drawContext) {
@ -136,9 +141,10 @@ static GrTexture* create_mask_GPU(GrContext* context,
// setup new clip
GrClip clip(clipRect);
// Draw the mask into maskTexture with the path's top-left at the origin using tempPaint.
// Draw the mask into maskTexture with the path's integerized top-left at
// the origin using tempPaint.
SkMatrix translate;
translate.setTranslate(-maskRect.fLeft, -maskRect.fTop);
translate.setTranslate(-maskRect->fLeft, -maskRect->fTop);
drawContext->drawPath(mask->asRenderTarget(), clip, tempPaint, translate, devPath, strokeInfo);
return mask;
}
@ -254,7 +260,7 @@ void GrBlurUtils::drawPathWithMaskFilter(GrContext* context,
}
SkAutoTUnref<GrTexture> mask(create_mask_GPU(context,
maskRect,
&maskRect,
*devPathPtr,
strokeInfo,
grPaint.isAntiAlias(),