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 "include/core/SkTypes.h"
9
10 #include "include/core/SkCanvas.h"
11 #include "include/core/SkSurface.h"
12
13 #include "include/gpu/GrContext.h"
14 #include "src/gpu/GrContextPriv.h"
15 #include "tests/Test.h"
16
read_pixels(sk_sp<SkSurface> surface,SkColor initColor)17 static SkBitmap read_pixels(sk_sp<SkSurface> surface, SkColor initColor) {
18 SkBitmap bmp;
19 bmp.allocN32Pixels(surface->width(), surface->height());
20 bmp.eraseColor(initColor);
21 if (!surface->readPixels(bmp, 0, 0)) {
22 SkDebugf("readPixels failed\n");
23 }
24 return bmp;
25 }
26
make_surface(GrContext * context)27 static sk_sp<SkSurface> make_surface(GrContext* context) {
28 SkImageInfo info = SkImageInfo::Make(50, 50, kRGBA_8888_SkColorType, kPremul_SkAlphaType);
29 return SkSurface::MakeRenderTarget(context, SkBudgeted::kNo, info, 4,
30 kBottomLeft_GrSurfaceOrigin, nullptr);
31 }
32
test_bug_6653(GrContext * ctx,skiatest::Reporter * reporter,const char * label)33 static void test_bug_6653(GrContext* ctx, skiatest::Reporter* reporter, const char* label) {
34 SkRect rect = SkRect::MakeWH(50, 50);
35
36 SkPaint paint;
37 paint.setColor(SK_ColorWHITE);
38 paint.setStrokeWidth(5);
39 paint.setStyle(SkPaint::kStroke_Style);
40
41 // The one device that fails this test (Galaxy S6) does so in a flaky fashion. Trying many
42 // times makes it more likely to fail. Also, interacting with the phone (eg swiping between
43 // different home screens) while the test is running makes it fail close to 100%.
44 static const int kNumIterations = 50;
45
46 for (int i = 0; i < kNumIterations; ++i) {
47 auto s0 = make_surface(ctx);
48 if (!s0) {
49 // MSAA may not be supported
50 return;
51 }
52
53 auto s1 = make_surface(ctx);
54 s1->getCanvas()->clear(SK_ColorBLACK);
55 s1->getCanvas()->drawOval(rect, paint);
56 SkBitmap b1 = read_pixels(s1, SK_ColorBLACK);
57 s1 = nullptr;
58
59 // The bug requires that all three of the following surfaces are cleared to the same color
60 auto s2 = make_surface(ctx);
61 s2->getCanvas()->clear(SK_ColorBLUE);
62 SkBitmap b2 = read_pixels(s2, SK_ColorBLACK);
63 s2 = nullptr;
64
65 auto s3 = make_surface(ctx);
66 s3->getCanvas()->clear(SK_ColorBLUE);
67 SkBitmap b3 = read_pixels(s3, SK_ColorBLACK);
68 s0->getCanvas()->drawBitmap(b3, 0, 0);
69 s3 = nullptr;
70
71 auto s4 = make_surface(ctx);
72 s4->getCanvas()->clear(SK_ColorBLUE);
73 s4->getCanvas()->drawOval(rect, paint);
74
75 // When this fails, b4 will "succeed", but return an empty bitmap (containing just the
76 // clear color). Regardless, b5 will contain the oval that was just drawn, so diffing the
77 // two bitmaps tests for the failure case. Initialize the bitmaps to different colors so
78 // that if the readPixels doesn't work, this test will always fail.
79 SkBitmap b4 = read_pixels(s4, SK_ColorRED);
80 SkBitmap b5 = read_pixels(s4, SK_ColorGREEN);
81
82 bool match = true;
83 for (int y = 0; y < b4.height() && match; ++y) {
84 for (int x = 0; x < b4.width() && match; ++x) {
85 uint32_t pixelA = *b4.getAddr32(x, y);
86 uint32_t pixelB = *b5.getAddr32(x, y);
87 if (pixelA != pixelB) {
88 match = false;
89 }
90 }
91 }
92
93 REPORTER_ASSERT(reporter, match, label);
94 }
95 }
96
97 // Tests that readPixels returns up-to-date results. This has failed on several GPUs,
98 // from multiple vendors, in MSAA mode.
DEF_GPUTEST_FOR_RENDERING_CONTEXTS(skbug6653,reporter,ctxInfo)99 DEF_GPUTEST_FOR_RENDERING_CONTEXTS(skbug6653, reporter, ctxInfo) {
100 GrContext* ctx = ctxInfo.grContext();
101 test_bug_6653(ctx, reporter, "Default");
102 }
103
104