diff options
author | 2015-02-13 09:05:47 -0800 | |
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committer | 2015-02-13 09:05:47 -0800 | |
commit | 5788faaa2ac4203827c68006b669e277d441e2e4 (patch) | |
tree | cdd8db5b902775e6ed9363b583195db6ab5d7cfc /src/effects/SkComposeImageFilter.cpp | |
parent | 95f192d19938b98a45dd1fa4112d965f60d10516 (diff) |
Fix SkComposeImageFilter's bounds computation and offset handling
This makes SkComposeImageFilter::computeFastBounds compose its
filters' bounds (rather than falling back to
SkImageFilter::computeFastBounds, which takes the union of the bounds).
This also makes SkComposeImageFilter::onFilterImage correctly handle
an offset produced when applying the inner filter; such offsets were
previously ignored.
BUG=chromium:453924
Review URL: https://codereview.chromium.org/908273002
Diffstat (limited to 'src/effects/SkComposeImageFilter.cpp')
-rw-r--r-- | src/effects/SkComposeImageFilter.cpp | 25 |
1 files changed, 23 insertions, 2 deletions
diff --git a/src/effects/SkComposeImageFilter.cpp b/src/effects/SkComposeImageFilter.cpp index 4a17e152de..2b1606a8a4 100644 --- a/src/effects/SkComposeImageFilter.cpp +++ b/src/effects/SkComposeImageFilter.cpp @@ -13,6 +13,15 @@ SkComposeImageFilter::~SkComposeImageFilter() { } +void SkComposeImageFilter::computeFastBounds(const SkRect& src, SkRect* dst) const { + SkImageFilter* outer = getInput(0); + SkImageFilter* inner = getInput(1); + + SkRect tmp; + inner->computeFastBounds(src, &tmp); + outer->computeFastBounds(tmp, dst); +} + bool SkComposeImageFilter::onFilterImage(Proxy* proxy, const SkBitmap& src, const Context& ctx, @@ -22,8 +31,20 @@ bool SkComposeImageFilter::onFilterImage(Proxy* proxy, SkImageFilter* inner = getInput(1); SkBitmap tmp; - return inner->filterImage(proxy, src, ctx, &tmp, offset) && - outer->filterImage(proxy, tmp, ctx, result, offset); + SkIPoint innerOffset = SkIPoint::Make(0, 0); + SkIPoint outerOffset = SkIPoint::Make(0, 0); + if (!inner->filterImage(proxy, src, ctx, &tmp, &innerOffset)) + return false; + + SkMatrix outerMatrix(ctx.ctm()); + outerMatrix.postTranslate(SkIntToScalar(-innerOffset.x()), SkIntToScalar(-innerOffset.y())); + Context outerContext(outerMatrix, ctx.clipBounds(), ctx.cache()); + if (!outer->filterImage(proxy, tmp, outerContext, result, &outerOffset)) { + return false; + } + + *offset = innerOffset + outerOffset; + return true; } bool SkComposeImageFilter::onFilterBounds(const SkIRect& src, |