1 /* 2 * Copyright 2017 Google Inc. 3 * 4 * Use of this source code is governed by a BSD-style license that can be 5 * found in the LICENSE file. 6 */ 7 8 #include "SkTypes.h" 9 10 #include "SkCanvas.h" 11 #include "SkSurface.h" 12 13 #if SK_SUPPORT_GPU 14 15 #include "GrContext.h" 16 #include "GrTest.h" 17 #include "Test.h" 18 19 static SkBitmap read_pixels(sk_sp<SkSurface> surface) { 20 SkBitmap bmp; 21 bmp.allocN32Pixels(surface->width(), surface->height()); 22 if (!surface->readPixels(bmp, 0, 0)) { 23 SkDebugf("readPixels failed\n"); 24 } 25 return bmp; 26 } 27 28 static sk_sp<SkSurface> make_surface(GrContext* context) { 29 SkImageInfo info = SkImageInfo::Make(50, 50, kRGBA_8888_SkColorType, kPremul_SkAlphaType); 30 return SkSurface::MakeRenderTarget(context, SkBudgeted::kNo, info, 4, 31 kBottomLeft_GrSurfaceOrigin, nullptr); 32 } 33 34 // Tests that readPixels returns up-to-date results. Demonstrates a bug on Galaxy S6 35 // (Mali T760), in MSAA mode. 36 DEF_GPUTEST_FOR_RENDERING_CONTEXTS(skbug6653, reporter, ctxInfo) { 37 GrContext* ctx = ctxInfo.grContext(); 38 SkRect rect = SkRect::MakeWH(50, 50); 39 40 SkPaint paint; 41 paint.setColor(SK_ColorWHITE); 42 paint.setStrokeWidth(5); 43 paint.setStyle(SkPaint::kStroke_Style); 44 45 // The one device that fails this test (Galaxy S6) does so in a flaky fashion. Trying many 46 // times makes it more likely to fail. Also, interacting with the phone (eg swiping between 47 // different home screens) while the test is running makes it fail close to 100%. 48 static const int kNumIterations = 50; 49 50 for (int i = 0; i < kNumIterations; ++i) { 51 auto s0 = make_surface(ctx); 52 if (!s0) { 53 // MSAA may not be supported 54 return; 55 } 56 57 auto s1 = make_surface(ctx); 58 s1->getCanvas()->clear(SK_ColorBLACK); 59 s1->getCanvas()->drawOval(rect, paint); 60 SkBitmap b1 = read_pixels(s1); 61 s1 = nullptr; 62 63 // The bug requires that all three of the following surfaces are cleared to the same color 64 auto s2 = make_surface(ctx); 65 s2->getCanvas()->clear(SK_ColorBLUE); 66 SkBitmap b2 = read_pixels(s2); 67 s2 = nullptr; 68 69 auto s3 = make_surface(ctx); 70 s3->getCanvas()->clear(SK_ColorBLUE); 71 SkBitmap b3 = read_pixels(s3); 72 s0->getCanvas()->drawBitmap(b3, 0, 0); 73 s3 = nullptr; 74 75 auto s4 = make_surface(ctx); 76 s4->getCanvas()->clear(SK_ColorBLUE); 77 s4->getCanvas()->drawOval(rect, paint); 78 79 // When this fails, b4 will "succeed", but return an empty bitmap (containing just the 80 // clear color). Regardless, b5 will contain the oval that was just drawn, so diffing the 81 // two bitmaps tests for the failure case. 82 SkBitmap b4 = read_pixels(s4); 83 SkBitmap b5 = read_pixels(s4); 84 85 bool match = true; 86 for (int y = 0; y < b4.height() && match; ++y) { 87 for (int x = 0; x < b4.width() && match; ++x) { 88 uint32_t pixelA = *b4.getAddr32(x, y); 89 uint32_t pixelB = *b5.getAddr32(x, y); 90 if (pixelA != pixelB) { 91 match = false; 92 } 93 } 94 } 95 96 REPORTER_ASSERT(reporter, match); 97 } 98 } 99 100 #endif 101
