1 /*
2 * Copyright 2011 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/SkColor.h"
11 #include "include/core/SkColorType.h"
12 #include "include/core/SkImageInfo.h"
13 #include "include/core/SkRefCnt.h"
14 #include "include/core/SkSurface.h"
15 #include "include/core/SkTypes.h"
16 #include "include/gpu/GpuTypes.h"
17 #include "include/gpu/GrDirectContext.h"
18 #include "include/private/base/SkDebug.h"
19 #include "src/core/SkConvertPixels.h"
20 #include "src/gpu/ganesh/GrDataUtils.h"
21 #include "src/gpu/ganesh/GrPixmap.h"
22 #include "tests/CtsEnforcement.h"
23 #include "tests/Test.h"
24
25 #include <array>
26 #include <cstddef>
27 #include <cstdint>
28
29 struct GrContextOptions;
30
pack_unpremul_rgba(SkColor c)31 static uint32_t pack_unpremul_rgba(SkColor c) {
32 uint32_t packed;
33 uint8_t* byte = reinterpret_cast<uint8_t*>(&packed);
34 byte[0] = SkColorGetR(c);
35 byte[1] = SkColorGetG(c);
36 byte[2] = SkColorGetB(c);
37 byte[3] = SkColorGetA(c);
38 return packed;
39 }
40
pack_unpremul_bgra(SkColor c)41 static uint32_t pack_unpremul_bgra(SkColor c) {
42 uint32_t packed;
43 uint8_t* byte = reinterpret_cast<uint8_t*>(&packed);
44 byte[0] = SkColorGetB(c);
45 byte[1] = SkColorGetG(c);
46 byte[2] = SkColorGetR(c);
47 byte[3] = SkColorGetA(c);
48 return packed;
49 }
50
51 typedef uint32_t (*PackUnpremulProc)(SkColor);
52
53 const struct {
54 SkColorType fColorType;
55 PackUnpremulProc fPackProc;
56 } gUnpremul[] = {
57 { kRGBA_8888_SkColorType, pack_unpremul_rgba },
58 { kBGRA_8888_SkColorType, pack_unpremul_bgra },
59 };
60
fill_surface(SkSurface * surf,SkColorType colorType,PackUnpremulProc proc)61 static void fill_surface(SkSurface* surf, SkColorType colorType, PackUnpremulProc proc) {
62 // Don't strictly need a bitmap, but its a handy way to allocate the pixels
63 SkBitmap bmp;
64 bmp.allocN32Pixels(256, 256);
65
66 for (int a = 0; a < 256; ++a) {
67 uint32_t* pixels = bmp.getAddr32(0, a);
68 for (int r = 0; r < 256; ++r) {
69 pixels[r] = proc(SkColorSetARGB(a, r, 0, 0));
70 }
71 }
72
73 const SkImageInfo info = SkImageInfo::Make(bmp.dimensions(), colorType, kUnpremul_SkAlphaType);
74 surf->writePixels({info, bmp.getPixels(), bmp.rowBytes()}, 0, 0);
75 }
76
test_premul_alpha_roundtrip(skiatest::Reporter * reporter,SkSurface * surf)77 static void test_premul_alpha_roundtrip(skiatest::Reporter* reporter, SkSurface* surf) {
78 for (size_t upmaIdx = 0; upmaIdx < std::size(gUnpremul); ++upmaIdx) {
79 fill_surface(surf, gUnpremul[upmaIdx].fColorType, gUnpremul[upmaIdx].fPackProc);
80
81 const SkImageInfo info = SkImageInfo::Make(256, 256, gUnpremul[upmaIdx].fColorType,
82 kUnpremul_SkAlphaType);
83 SkBitmap readBmp1;
84 readBmp1.allocPixels(info);
85 SkBitmap readBmp2;
86 readBmp2.allocPixels(info);
87
88 readBmp1.eraseColor(0);
89 readBmp2.eraseColor(0);
90
91 surf->readPixels(readBmp1, 0, 0);
92 surf->writePixels(readBmp1, 0, 0);
93 surf->readPixels(readBmp2, 0, 0);
94
95 bool success = true;
96 for (int y = 0; y < 256 && success; ++y) {
97 const uint32_t* pixels1 = readBmp1.getAddr32(0, y);
98 const uint32_t* pixels2 = readBmp2.getAddr32(0, y);
99 for (int x = 0; x < 256 && success; ++x) {
100 // We see sporadic failures here. May help to see where it goes wrong.
101 if (pixels1[x] != pixels2[x]) {
102 SkDebugf("%x != %x, x = %d, y = %d\n", pixels1[x], pixels2[x], x, y);
103 }
104 REPORTER_ASSERT(reporter, success = pixels1[x] == pixels2[x]);
105 }
106 }
107 }
108 }
109
DEF_TEST(PremulAlphaRoundTrip,reporter)110 DEF_TEST(PremulAlphaRoundTrip, reporter) {
111 const SkImageInfo info = SkImageInfo::MakeN32Premul(256, 256);
112
113 sk_sp<SkSurface> surf(SkSurface::MakeRaster(info));
114
115 test_premul_alpha_roundtrip(reporter, surf.get());
116 }
DEF_GANESH_TEST_FOR_RENDERING_CONTEXTS(PremulAlphaRoundTrip_Gpu,reporter,ctxInfo,CtsEnforcement::kApiLevel_T)117 DEF_GANESH_TEST_FOR_RENDERING_CONTEXTS(PremulAlphaRoundTrip_Gpu,
118 reporter,
119 ctxInfo,
120 CtsEnforcement::kApiLevel_T) {
121 const SkImageInfo info = SkImageInfo::MakeN32Premul(256, 256);
122
123 sk_sp<SkSurface> surf(
124 SkSurface::MakeRenderTarget(ctxInfo.directContext(), skgpu::Budgeted::kNo, info));
125 test_premul_alpha_roundtrip(reporter, surf.get());
126 }
127
DEF_TEST(PremulAlphaRoundTripGrConvertPixels,reporter)128 DEF_TEST(PremulAlphaRoundTripGrConvertPixels, reporter) {
129 // Code that does the same thing as above, but using GrConvertPixels. This simulates what
130 // happens if you run the above on a machine with a GPU that doesn't have a valid PM/UPM
131 // conversion pair of FPs.
132 const SkImageInfo upmInfo =
133 SkImageInfo::Make(256, 256, kRGBA_8888_SkColorType, kUnpremul_SkAlphaType);
134 const SkImageInfo pmInfo =
135 SkImageInfo::Make(256, 256, kRGBA_8888_SkColorType, kPremul_SkAlphaType);
136
137 GrPixmap src = GrPixmap::Allocate(upmInfo);
138 uint32_t* srcPixels = (uint32_t*)src.addr();
139 for (int y = 0; y < 256; ++y) {
140 for (int x = 0; x < 256; ++x) {
141 srcPixels[y * 256 + x] = pack_unpremul_rgba(SkColorSetARGB(y, x, x, x));
142 }
143 }
144
145 GrPixmap surf = GrPixmap::Allocate(pmInfo);
146 GrConvertPixels(surf, src);
147
148 GrPixmap read1 = GrPixmap::Allocate(upmInfo);
149 GrConvertPixels(read1, surf);
150
151 GrPixmap surf2 = GrPixmap::Allocate(pmInfo);
152 GrConvertPixels(surf2, read1);
153
154 GrPixmap read2 = GrPixmap::Allocate(upmInfo);
155 GrConvertPixels(read2, surf2);
156
157 auto get_pixel = [](const GrPixmap& pm, int x, int y) {
158 const uint32_t* addr = (const uint32_t*)pm.addr();
159 return addr[y * 256 + x];
160 };
161 auto dump_pixel_history = [&](int x, int y) {
162 SkDebugf("Pixel history for (%d, %d):\n", x, y);
163 SkDebugf("Src : %08x\n", get_pixel(src, x, y));
164 SkDebugf(" -> : %08x\n", get_pixel(surf, x, y));
165 SkDebugf(" <- : %08x\n", get_pixel(read1, x, y));
166 SkDebugf(" -> : %08x\n", get_pixel(surf2, x, y));
167 SkDebugf(" <- : %08x\n", get_pixel(read2, x, y));
168 };
169
170 bool success = true;
171 for (int y = 0; y < 256 && success; ++y) {
172 const uint32_t* pixels1 = (const uint32_t*) read1.addr();
173 const uint32_t* pixels2 = (const uint32_t*) read2.addr();
174 for (int x = 0; x < 256 && success; ++x) {
175 uint32_t c1 = pixels1[y * 256 + x],
176 c2 = pixels2[y * 256 + x];
177 // If this ever fails, it's helpful to see where it goes wrong.
178 if (c1 != c2) {
179 dump_pixel_history(x, y);
180 }
181 REPORTER_ASSERT(reporter, success = c1 == c2);
182 }
183 }
184 }
185
DEF_TEST(PremulAlphaRoundTripSkConvertPixels,reporter)186 DEF_TEST(PremulAlphaRoundTripSkConvertPixels, reporter) {
187 // ... and now using SkConvertPixels, just for completeness
188 const SkImageInfo upmInfo =
189 SkImageInfo::Make(256, 256, kRGBA_8888_SkColorType, kUnpremul_SkAlphaType);
190 const SkImageInfo pmInfo =
191 SkImageInfo::Make(256, 256, kRGBA_8888_SkColorType, kPremul_SkAlphaType);
192
193 SkBitmap src; src.allocPixels(upmInfo);
194 uint32_t* srcPixels = src.getAddr32(0, 0);
195 for (int y = 0; y < 256; ++y) {
196 for (int x = 0; x < 256; ++x) {
197 srcPixels[y * 256 + x] = pack_unpremul_rgba(SkColorSetARGB(y, x, x, x));
198 }
199 }
200
201 auto convert = [](const SkBitmap& dst, const SkBitmap& src){
202 SkAssertResult(SkConvertPixels(dst.info(), dst.getAddr(0, 0), dst.rowBytes(),
203 src.info(), src.getAddr(0, 0), src.rowBytes()));
204 };
205
206 SkBitmap surf; surf.allocPixels(pmInfo);
207 convert(surf, src);
208
209 SkBitmap read1; read1.allocPixels(upmInfo);
210 convert(read1, surf);
211
212 SkBitmap surf2; surf2.allocPixels(pmInfo);
213 convert(surf2, read1);
214
215 SkBitmap read2; read2.allocPixels(upmInfo);
216 convert(read2, surf2);
217
218 auto dump_pixel_history = [&](int x, int y) {
219 SkDebugf("Pixel history for (%d, %d):\n", x, y);
220 SkDebugf("Src : %08x\n", *src.getAddr32(x, y));
221 SkDebugf(" -> : %08x\n", *surf.getAddr32(x, y));
222 SkDebugf(" <- : %08x\n", *read1.getAddr32(x, y));
223 SkDebugf(" -> : %08x\n", *surf2.getAddr32(x, y));
224 SkDebugf(" <- : %08x\n", *read2.getAddr32(x, y));
225 };
226
227 bool success = true;
228 for (int y = 0; y < 256 && success; ++y) {
229 const uint32_t* pixels1 = read1.getAddr32(0, 0);
230 const uint32_t* pixels2 = read2.getAddr32(0, 0);
231 for (int x = 0; x < 256 && success; ++x) {
232 uint32_t c1 = pixels1[y * 256 + x],
233 c2 = pixels2[y * 256 + x];
234 // If this ever fails, it's helpful to see where it goes wrong.
235 if (c1 != c2) {
236 dump_pixel_history(x, y);
237 }
238 REPORTER_ASSERT(reporter, success = c1 == c2);
239 }
240 }
241 }
242