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/SkBitmap.h"
9 #include "include/core/SkCanvas.h"
10 #include "include/core/SkSurface.h"
11 #include "include/core/SkTypes.h"
12 #include "include/gpu/GrDirectContext.h"
13 #include "src/gpu/GrDirectContextPriv.h"
14 #include "tests/Test.h"
15
read_pixels(sk_sp<SkSurface> surface,SkColor initColor)16 static SkBitmap read_pixels(sk_sp<SkSurface> surface, SkColor initColor) {
17 SkBitmap bmp;
18 bmp.allocN32Pixels(surface->width(), surface->height());
19 bmp.eraseColor(initColor);
20 if (!surface->readPixels(bmp, 0, 0)) {
21 SkDebugf("readPixels failed\n");
22 }
23 return bmp;
24 }
25
make_surface(GrRecordingContext * rContext)26 static sk_sp<SkSurface> make_surface(GrRecordingContext* rContext) {
27 SkImageInfo info = SkImageInfo::Make(50, 50, kRGBA_8888_SkColorType, kPremul_SkAlphaType);
28 return SkSurface::MakeRenderTarget(rContext, SkBudgeted::kNo, info, 4,
29 kBottomLeft_GrSurfaceOrigin, nullptr);
30 }
31
test_bug_6653(GrDirectContext * dContext,skiatest::Reporter * reporter,const char * label)32 static void test_bug_6653(GrDirectContext* dContext,
33 skiatest::Reporter* reporter,
34 const char* label) {
35 SkRect rect = SkRect::MakeWH(50, 50);
36
37 SkPaint paint;
38 paint.setColor(SK_ColorWHITE);
39 paint.setStrokeWidth(5);
40 paint.setStyle(SkPaint::kStroke_Style);
41
42 // The one device that fails this test (Galaxy S6) does so in a flaky fashion. Trying many
43 // times makes it more likely to fail. Also, interacting with the phone (eg swiping between
44 // different home screens) while the test is running makes it fail close to 100%.
45 static const int kNumIterations = 50;
46
47 for (int i = 0; i < kNumIterations; ++i) {
48 auto s0 = make_surface(dContext);
49 if (!s0) {
50 // MSAA may not be supported
51 return;
52 }
53
54 auto s1 = make_surface(dContext);
55 s1->getCanvas()->clear(SK_ColorBLACK);
56 s1->getCanvas()->drawOval(rect, paint);
57 SkBitmap b1 = read_pixels(s1, SK_ColorBLACK);
58 s1 = nullptr;
59
60 // The bug requires that all three of the following surfaces are cleared to the same color
61 auto s2 = make_surface(dContext);
62 s2->getCanvas()->clear(SK_ColorBLUE);
63 SkBitmap b2 = read_pixels(s2, SK_ColorBLACK);
64 s2 = nullptr;
65
66 auto s3 = make_surface(dContext);
67 s3->getCanvas()->clear(SK_ColorBLUE);
68 s0->getCanvas()->drawImage(read_pixels(s3, SK_ColorBLACK).asImage(), 0, 0);
69 s3 = nullptr;
70
71 auto s4 = make_surface(dContext);
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 auto ctx = ctxInfo.directContext();
101 test_bug_6653(ctx, reporter, "Default");
102 }
103
104