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Diffstat (limited to 'tests/skbug6653.cpp')
-rw-r--r-- | tests/skbug6653.cpp | 96 |
1 files changed, 96 insertions, 0 deletions
diff --git a/tests/skbug6653.cpp b/tests/skbug6653.cpp new file mode 100644 index 0000000000..eaf166c3e3 --- /dev/null +++ b/tests/skbug6653.cpp @@ -0,0 +1,96 @@ +/* + * Copyright 2017 Google Inc. + * + * Use of this source code is governed by a BSD-style license that can be + * found in the LICENSE file. + */ + +#include "SkTypes.h" + +#include "SkCanvas.h" +#include "SkSurface.h" + +#if SK_SUPPORT_GPU + +#include "GrContext.h" +#include "GrTest.h" +#include "Test.h" + +static SkBitmap read_pixels(sk_sp<SkSurface> surface) { + SkBitmap bmp; + bmp.allocN32Pixels(surface->width(), surface->height()); + if (!surface->getCanvas()->readPixels(bmp, 0, 0)) { + SkDebugf("readPixels failed\n"); + } + return bmp; +} + +static sk_sp<SkSurface> make_surface(GrContext* context) { + SkImageInfo info = SkImageInfo::Make(50, 50, kRGBA_8888_SkColorType, kPremul_SkAlphaType); + return SkSurface::MakeRenderTarget(context, SkBudgeted::kNo, info, 4, + kBottomLeft_GrSurfaceOrigin, nullptr); +} + +// Tests that readPixels returns up-to-date results. Demonstrates a bug on Galaxy S6 +// (Mali T760), in MSAA mode. +DEF_GPUTEST_FOR_RENDERING_CONTEXTS(skbug6653, reporter, ctxInfo) { + GrContext* ctx = ctxInfo.grContext(); + SkRect rect = SkRect::MakeWH(50, 50); + + SkPaint paint; + paint.setColor(SK_ColorWHITE); + paint.setStrokeWidth(5); + paint.setStyle(SkPaint::kStroke_Style); + + // The one device that fails this test (Galaxy S6) does so in a flaky fashion. Trying many + // times makes it more likely to fail. Also, interacting with the phone (eg swiping between + // different home screens) while the test is running makes it fail close to 100%. + static const int kNumIterations = 50; + + for (int i = 0; i < kNumIterations; ++i) { + auto s0 = make_surface(ctx); + + auto s1 = make_surface(ctx); + s1->getCanvas()->clear(SK_ColorBLACK); + s1->getCanvas()->drawOval(rect, paint); + SkBitmap b1 = read_pixels(s1); + s1 = nullptr; + + // The bug requires that all three of the following surfaces are cleared to the same color + auto s2 = make_surface(ctx); + s2->getCanvas()->clear(SK_ColorBLUE); + SkBitmap b2 = read_pixels(s2); + s2 = nullptr; + + auto s3 = make_surface(ctx); + s3->getCanvas()->clear(SK_ColorBLUE); + SkBitmap b3 = read_pixels(s3); + s0->getCanvas()->drawBitmap(b3, 0, 0); + s3 = nullptr; + + auto s4 = make_surface(ctx); + s4->getCanvas()->clear(SK_ColorBLUE); + s4->getCanvas()->drawOval(rect, paint); + + // When this fails, b4 will "succeed", but return an empty bitmap (containing just the + // clear color). Regardless, b5 will contain the oval that was just drawn, so diffing the + // two bitmaps tests for the failure case. + SkBitmap b4 = read_pixels(s4); + SkBitmap b5 = read_pixels(s4); + + bool match = true; + for (int y = 0; y < b4.height() && match; ++y) { + for (int x = 0; x < b4.width() && match; ++x) { + uint32_t pixelA = *b4.getAddr32(x, y); + uint32_t pixelB = *b5.getAddr32(x, y); + if (pixelA != pixelB) { + match = false; + } + } + } + + REPORTER_ASSERT(reporter, match); + } +} + +#endif |