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add test for copy-on-write optimization

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exercises a bug in the device-clip CL (hopefully to land soon)
BUG=skia:

Change-Id: I5a740280e1a3d6a4634338d04d9f1a1f9dc84dbb
Reviewed-on: https://skia-review.googlesource.com/9325
Reviewed-by: Florin Malita <fmalita@chromium.org>
Commit-Queue: Mike Reed <reed@google.com>
This commit is contained in:
Mike Reed 2017-03-06 16:37:07 -05:00 committed by Skia Commit-Bot
parent e9c99b8baa
commit d94abc5330
1 changed files with 23 additions and 0 deletions
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23
gm/surface.cpp
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@ -146,3 +146,26 @@ private:
typedef GM INHERITED;
};
DEF_GM( return new NewSurfaceGM )
///////////////////////////////////////////////////////////////////////////////////////////////////
DEF_SIMPLE_GM(copy_on_write_retain, canvas, 256, 256) {
const SkImageInfo info = SkImageInfo::MakeN32Premul(256, 256);
sk_sp<SkSurface> surf = canvas->makeSurface(info, nullptr);
if (!surf) {
surf = SkSurface::MakeRaster(info, nullptr);
}
surf->getCanvas()->clear(SK_ColorRED);
// its important that image survives longer than the next draw, so the surface will see
// an outstanding image, and have to decide if it should retain or discard those pixels
sk_sp<SkImage> image = surf->makeImageSnapshot();
// normally a clear+opaque should trigger the discard optimization, but since we have a clip
// it should not (we need the previous red pixels).
surf->getCanvas()->clipRect(SkRect::MakeWH(128, 256));
surf->getCanvas()->clear(SK_ColorBLUE);
// expect to see two rects: blue | red
canvas->drawImage(surf->makeImageSnapshot(), 0, 0, nullptr);
}