1 /*
2 * Copyright 2015 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/SkAlphaType.h"
9 #include "include/core/SkBitmap.h"
10 #include "include/core/SkBlendMode.h"
11 #include "include/core/SkCanvas.h"
12 #include "include/core/SkColor.h"
13 #include "include/core/SkColorType.h"
14 #include "include/core/SkImageInfo.h"
15 #include "include/core/SkPaint.h"
16 #include "include/core/SkPoint.h"
17 #include "include/core/SkRect.h"
18 #include "include/core/SkRefCnt.h"
19 #include "include/core/SkSize.h"
20 #include "include/core/SkSurface.h"
21 #include "include/core/SkTypes.h"
22 #include "include/gpu/GrTypes.h"
23 #include "include/private/base/SkTemplates.h"
24 #include "tests/CtsEnforcement.h"
25 #include "tests/Test.h"
26 #include "tools/gpu/BackendSurfaceFactory.h"
27
28 #include <initializer_list>
29 #include <vector>
30
31 struct GrContextOptions;
32 struct Results { int diffs, diffs_0x00, diffs_0xff, diffs_by_1; };
33
acceptable(const Results & r)34 static bool acceptable(const Results& r) {
35 #if 0
36 SkDebugf("%d diffs, %d at 0x00, %d at 0xff, %d off by 1, all out of 65536\n",
37 r.diffs, r.diffs_0x00, r.diffs_0xff, r.diffs_by_1);
38 #endif
39 return r.diffs_by_1 == r.diffs // never off by more than 1
40 && r.diffs_0x00 == 0 // transparent must stay transparent
41 && r.diffs_0xff == 0; // opaque must stay opaque
42 }
43
44 template <typename Fn>
test(Fn && multiply)45 static Results test(Fn&& multiply) {
46 Results r = { 0,0,0,0 };
47 for (int x = 0; x < 256; x++) {
48 for (int y = 0; y < 256; y++) {
49 int p = multiply(x, y),
50 ideal = (x*y+127)/255;
51 if (p != ideal) {
52 r.diffs++;
53 if (x == 0x00 || y == 0x00) { r.diffs_0x00++; }
54 if (x == 0xff || y == 0xff) { r.diffs_0xff++; }
55 if (SkTAbs(ideal - p) == 1) { r.diffs_by_1++; }
56 }
57 }}
58 return r;
59 }
60
DEF_TEST(Blend_byte_multiply,r)61 DEF_TEST(Blend_byte_multiply, r) {
62 // These are all temptingly close but fundamentally broken.
63 int (*broken[])(int, int) = {
64 [](int x, int y) { return (x*y)>>8; },
65 [](int x, int y) { return (x*y+128)>>8; },
66 [](int x, int y) { y += y>>7; return (x*y)>>8; },
67 };
68 for (auto multiply : broken) { REPORTER_ASSERT(r, !acceptable(test(multiply))); }
69
70 // These are fine to use, but not perfect.
71 int (*fine[])(int, int) = {
72 [](int x, int y) { return (x*y+x)>>8; },
73 [](int x, int y) { return (x*y+y)>>8; },
74 [](int x, int y) { return (x*y+255)>>8; },
75 [](int x, int y) { y += y>>7; return (x*y+128)>>8; },
76 };
77 for (auto multiply : fine) { REPORTER_ASSERT(r, acceptable(test(multiply))); }
78
79 // These are pefect.
80 int (*perfect[])(int, int) = {
81 [](int x, int y) { return (x*y+127)/255; }, // Duh.
82 [](int x, int y) { int p = (x*y+128); return (p+(p>>8))>>8; },
83 [](int x, int y) { return ((x*y+128)*257)>>16; },
84 };
85 for (auto multiply : perfect) { REPORTER_ASSERT(r, test(multiply).diffs == 0); }
86 }
87
88 // Tests blending to a surface with no texture available.
DEF_GANESH_TEST_FOR_GL_RENDERING_CONTEXTS(ES2BlendWithNoTexture,reporter,ctxInfo,CtsEnforcement::kApiLevel_T)89 DEF_GANESH_TEST_FOR_GL_RENDERING_CONTEXTS(ES2BlendWithNoTexture,
90 reporter,
91 ctxInfo,
92 CtsEnforcement::kApiLevel_T) {
93 auto context = ctxInfo.directContext();
94 static constexpr SkISize kDimensions{10, 10};
95 const SkColorType kColorType = kRGBA_8888_SkColorType;
96
97 // Build our test cases:
98 struct RectAndSamplePoint {
99 SkRect rect;
100 SkIPoint outPoint;
101 SkIPoint inPoint;
102 } allRectsAndPoints[3] = {
103 {SkRect::MakeXYWH(0, 0, 5, 5), SkIPoint::Make(7, 7), SkIPoint::Make(2, 2)},
104 {SkRect::MakeXYWH(2, 2, 5, 5), SkIPoint::Make(1, 1), SkIPoint::Make(4, 4)},
105 {SkRect::MakeXYWH(5, 5, 5, 5), SkIPoint::Make(2, 2), SkIPoint::Make(7, 7)},
106 };
107
108 struct TestCase {
109 RectAndSamplePoint fRectAndPoints;
110 SkRect fClip;
111 int fSampleCnt;
112 GrSurfaceOrigin fOrigin;
113 };
114 std::vector<TestCase> testCases;
115
116 for (auto origin : { kTopLeft_GrSurfaceOrigin, kBottomLeft_GrSurfaceOrigin}) {
117 for (int sampleCnt : {1, 4}) {
118 for (auto rectAndPoints : allRectsAndPoints) {
119 for (auto clip : {SkRect::MakeXYWH(0, 0, 10, 10), SkRect::MakeXYWH(1, 1, 8, 8)}) {
120 testCases.push_back({rectAndPoints, clip, sampleCnt, origin});
121 }
122 }
123 }
124 }
125
126 // Run each test case:
127 for (auto testCase : testCases) {
128 int sampleCnt = testCase.fSampleCnt;
129 SkRect paintRect = testCase.fRectAndPoints.rect;
130 SkIPoint outPoint = testCase.fRectAndPoints.outPoint;
131 SkIPoint inPoint = testCase.fRectAndPoints.inPoint;
132 GrSurfaceOrigin origin = testCase.fOrigin;
133
134 // BGRA forces a framebuffer blit on ES2.
135 sk_sp<SkSurface> surface = sk_gpu_test::MakeBackendRenderTargetSurface(context,
136 kDimensions,
137 origin,
138 sampleCnt,
139 kColorType);
140
141 if (!surface && sampleCnt > 1) {
142 // Some platforms don't support MSAA.
143 continue;
144 }
145 REPORTER_ASSERT(reporter, !!surface);
146
147 // Fill our canvas with 0xFFFF80
148 SkCanvas* canvas = surface->getCanvas();
149 canvas->clipRect(testCase.fClip, false);
150 SkPaint black_paint;
151 black_paint.setColor(SkColorSetRGB(0xFF, 0xFF, 0x80));
152 canvas->drawRect(SkRect::Make(kDimensions), black_paint);
153
154 // Blend 2x2 pixels at 5,5 with 0x80FFFF. Use multiply blend mode as this will trigger
155 // a copy of the destination.
156 SkPaint white_paint;
157 white_paint.setColor(SkColorSetRGB(0x80, 0xFF, 0xFF));
158 white_paint.setBlendMode(SkBlendMode::kMultiply);
159 canvas->drawRect(paintRect, white_paint);
160
161 // Read the result into a bitmap.
162 SkBitmap bitmap;
163 REPORTER_ASSERT(reporter, bitmap.tryAllocPixels(SkImageInfo::Make(kDimensions, kColorType,
164 kPremul_SkAlphaType)));
165 REPORTER_ASSERT(
166 reporter,
167 surface->readPixels(bitmap.info(), bitmap.getPixels(), bitmap.rowBytes(), 0, 0));
168
169 // Check the in/out pixels.
170 REPORTER_ASSERT(reporter, bitmap.getColor(outPoint.x(), outPoint.y()) ==
171 SkColorSetRGB(0xFF, 0xFF, 0x80));
172 REPORTER_ASSERT(reporter, bitmap.getColor(inPoint.x(), inPoint.y()) ==
173 SkColorSetRGB(0x80, 0xFF, 0x80));
174 }
175 }
176