1/*
2 * Copyright 2014 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/private/SkColorData.h"
9#include "include/private/SkHalf.h"
10#include "include/private/SkImageInfoPriv.h"
11#include "src/core/SkColorSpacePriv.h"
12#include "src/core/SkColorSpaceXformSteps.h"
13#include "src/core/SkConvertPixels.h"
14#include "src/core/SkOpts.h"
15#include "src/core/SkRasterPipeline.h"
16
17static bool rect_memcpy(const SkImageInfo& dstInfo, void* dstPixels, size_t dstRB,
18 const SkImageInfo& srcInfo, const void* srcPixels, size_t srcRB,
19 const SkColorSpaceXformSteps& steps) {
20 // We can copy the pixels when no color type, alpha type, or color space changes.
21 if (dstInfo.colorType() != srcInfo.colorType()) {
22 return false;
23 }
24 if (dstInfo.colorType() != kAlpha_8_SkColorType
25 && steps.flags.mask() != 0b00000) {
26 return false;
27 }
28
29 SkRectMemcpy(dstPixels, dstRB,
30 srcPixels, srcRB, dstInfo.minRowBytes(), dstInfo.height());
31 return true;
32}
33
34static bool swizzle_or_premul(const SkImageInfo& dstInfo, void* dstPixels, size_t dstRB,
35 const SkImageInfo& srcInfo, const void* srcPixels, size_t srcRB,
36 const SkColorSpaceXformSteps& steps) {
37 auto is_8888 = [](SkColorType ct) {
38 return ct == kRGBA_8888_SkColorType || ct == kBGRA_8888_SkColorType;
39 };
40 if (!is_8888(dstInfo.colorType()) ||
41 !is_8888(srcInfo.colorType()) ||
42 steps.flags.linearize ||
43 steps.flags.gamut_transform ||
44 steps.flags.unpremul ||
45 steps.flags.encode) {
46 return false;
47 }
48
49 const bool swapRB = dstInfo.colorType() != srcInfo.colorType();
50
51 void (*fn)(uint32_t*, const uint32_t*, int) = nullptr;
52
53 if (steps.flags.premul) {
54 fn = swapRB ? SkOpts::RGBA_to_bgrA
55 : SkOpts::RGBA_to_rgbA;
56 } else {
57 // If we're not swizzling, we ought to have used rect_memcpy().
58 SkASSERT(swapRB);
59 fn = SkOpts::RGBA_to_BGRA;
60 }
61
62 for (int y = 0; y < dstInfo.height(); y++) {
63 fn((uint32_t*)dstPixels, (const uint32_t*)srcPixels, dstInfo.width());
64 dstPixels = SkTAddOffset<void>(dstPixels, dstRB);
65 srcPixels = SkTAddOffset<const void>(srcPixels, srcRB);
66 }
67 return true;
68}
69
70static bool convert_to_alpha8(const SkImageInfo& dstInfo, void* vdst, size_t dstRB,
71 const SkImageInfo& srcInfo, const void* src, size_t srcRB,
72 const SkColorSpaceXformSteps&) {
73 if (dstInfo.colorType() != kAlpha_8_SkColorType) {
74 return false;
75 }
76 auto dst = (uint8_t*)vdst;
77
78 switch (srcInfo.colorType()) {
79 case kUnknown_SkColorType:
80 case kAlpha_8_SkColorType: {
81 // Unknown should never happen.
82 // Alpha8 should have been handled by rect_memcpy().
83 SkASSERT(false);
84 return false;
85 }
86
87 case kA16_unorm_SkColorType: {
88 auto src16 = (const uint16_t*) src;
89 for (int y = 0; y < srcInfo.height(); y++) {
90 for (int x = 0; x < srcInfo.width(); x++) {
91 dst[x] = src16[x] >> 8;
92 }
93 dst = SkTAddOffset<uint8_t>(dst, dstRB);
94 src16 = SkTAddOffset<const uint16_t>(src16, srcRB);
95 }
96 return true;
97 }
98
99 case kGray_8_SkColorType:
100 case kRGB_565_SkColorType:
101 case kR8G8_unorm_SkColorType:
102 case kR16G16_unorm_SkColorType:
103 case kR16G16_float_SkColorType:
104 case kRGB_888x_SkColorType:
105 case kRGB_101010x_SkColorType:
106 case kBGR_101010x_SkColorType: {
107 for (int y = 0; y < srcInfo.height(); ++y) {
108 memset(dst, 0xFF, srcInfo.width());
109 dst = SkTAddOffset<uint8_t>(dst, dstRB);
110 }
111 return true;
112 }
113
114 case kARGB_4444_SkColorType: {
115 auto src16 = (const uint16_t*) src;
116 for (int y = 0; y < srcInfo.height(); y++) {
117 for (int x = 0; x < srcInfo.width(); x++) {
118 dst[x] = SkPacked4444ToA32(src16[x]);
119 }
120 dst = SkTAddOffset<uint8_t>(dst, dstRB);
121 src16 = SkTAddOffset<const uint16_t>(src16, srcRB);
122 }
123 return true;
124 }
125
126 case kBGRA_8888_SkColorType:
127 case kRGBA_8888_SkColorType: {
128 auto src32 = (const uint32_t*) src;
129 for (int y = 0; y < srcInfo.height(); y++) {
130 for (int x = 0; x < srcInfo.width(); x++) {
131 dst[x] = src32[x] >> 24;
132 }
133 dst = SkTAddOffset<uint8_t>(dst, dstRB);
134 src32 = SkTAddOffset<const uint32_t>(src32, srcRB);
135 }
136 return true;
137 }
138
139 case kRGBA_1010102_SkColorType:
140 case kBGRA_1010102_SkColorType: {
141 auto src32 = (const uint32_t*) src;
142 for (int y = 0; y < srcInfo.height(); y++) {
143 for (int x = 0; x < srcInfo.width(); x++) {
144 dst[x] = (src32[x] >> 30) * 0x55;
145 }
146 dst = SkTAddOffset<uint8_t>(dst, dstRB);
147 src32 = SkTAddOffset<const uint32_t>(src32, srcRB);
148 }
149 return true;
150 }
151
152 case kRGBA_F16Norm_SkColorType:
153 case kRGBA_F16_SkColorType: {
154 auto src64 = (const uint64_t*) src;
155 for (int y = 0; y < srcInfo.height(); y++) {
156 for (int x = 0; x < srcInfo.width(); x++) {
157 dst[x] = (uint8_t) (255.0f * SkHalfToFloat(src64[x] >> 48));
158 }
159 dst = SkTAddOffset<uint8_t>(dst, dstRB);
160 src64 = SkTAddOffset<const uint64_t>(src64, srcRB);
161 }
162 return true;
163 }
164
165 case kRGBA_F32_SkColorType: {
166 auto rgba = (const float*)src;
167 for (int y = 0; y < srcInfo.height(); y++) {
168 for (int x = 0; x < srcInfo.width(); x++) {
169 dst[x] = (uint8_t)(255.0f * rgba[4*x+3]);
170 }
171 dst = SkTAddOffset<uint8_t>(dst, dstRB);
172 rgba = SkTAddOffset<const float>(rgba, srcRB);
173 }
174 return true;
175 }
176
177 case kA16_float_SkColorType: {
178 auto srcF16 = (const uint16_t*) src;
179 for (int y = 0; y < srcInfo.height(); y++) {
180 for (int x = 0; x < srcInfo.width(); x++) {
181 dst[x] = (uint8_t) (255.0f * SkHalfToFloat(srcF16[x]));
182 }
183 dst = SkTAddOffset<uint8_t>(dst, dstRB);
184 srcF16 = SkTAddOffset<const uint16_t>(srcF16, srcRB);
185 }
186 return true;
187 }
188
189 case kR16G16B16A16_unorm_SkColorType: {
190 auto src64 = (const uint64_t*) src;
191 for (int y = 0; y < srcInfo.height(); y++) {
192 for (int x = 0; x < srcInfo.width(); x++) {
193 dst[x] = (src64[x] >> 48) >> 8;
194 }
195 dst = SkTAddOffset<uint8_t>(dst, dstRB);
196 src64 = SkTAddOffset<const uint64_t>(src64, srcRB);
197 }
198 return true;
199 }
200 }
201 return false;
202}
203
204// Default: Use the pipeline.
205static void convert_with_pipeline(const SkImageInfo& dstInfo, void* dstRow, size_t dstRB,
206 const SkImageInfo& srcInfo, const void* srcRow, size_t srcRB,
207 const SkColorSpaceXformSteps& steps) {
208
209 SkRasterPipeline_MemoryCtx src = { (void*)srcRow, (int)(srcRB / srcInfo.bytesPerPixel()) },
210 dst = { (void*)dstRow, (int)(dstRB / dstInfo.bytesPerPixel()) };
211
212 SkRasterPipeline_<256> pipeline;
213 pipeline.append_load(srcInfo.colorType(), &src);
214 steps.apply(&pipeline);
215
216 pipeline.append_gamut_clamp_if_normalized(dstInfo);
217
218 pipeline.append_store(dstInfo.colorType(), &dst);
219 pipeline.run(0,0, srcInfo.width(), srcInfo.height());
220}
221
222void SkConvertPixels(const SkImageInfo& dstInfo, void* dstPixels, size_t dstRB,
223 const SkImageInfo& srcInfo, const void* srcPixels, size_t srcRB) {
224 SkASSERT(dstInfo.dimensions() == srcInfo.dimensions());
225 SkASSERT(SkImageInfoValidConversion(dstInfo, srcInfo));
226
227 SkColorSpaceXformSteps steps{srcInfo.colorSpace(), srcInfo.alphaType(),
228 dstInfo.colorSpace(), dstInfo.alphaType()};
229
230 for (auto fn : {rect_memcpy, swizzle_or_premul, convert_to_alpha8}) {
231 if (fn(dstInfo, dstPixels, dstRB, srcInfo, srcPixels, srcRB, steps)) {
232 return;
233 }
234 }
235 convert_with_pipeline(dstInfo, dstPixels, dstRB, srcInfo, srcPixels, srcRB, steps);
236}
237