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
rect_memcpy(const SkImageInfo & dstInfo,void * dstPixels,size_t dstRB,const SkImageInfo & srcInfo,const void * srcPixels,size_t srcRB,const SkColorSpaceXformSteps & steps)17 static 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
swizzle_or_premul(const SkImageInfo & dstInfo,void * dstPixels,size_t dstRB,const SkImageInfo & srcInfo,const void * srcPixels,size_t srcRB,const SkColorSpaceXformSteps & steps)34 static 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
convert_to_alpha8(const SkImageInfo & dstInfo,void * vdst,size_t dstRB,const SkImageInfo & srcInfo,const void * src,size_t srcRB,const SkColorSpaceXformSteps &)70 static 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 for (int y = 0; y < srcInfo.height(); ++y) {
107 memset(dst, 0xFF, srcInfo.width());
108 dst = SkTAddOffset<uint8_t>(dst, dstRB);
109 }
110 return true;
111 }
112
113 case kARGB_4444_SkColorType: {
114 auto src16 = (const uint16_t*) src;
115 for (int y = 0; y < srcInfo.height(); y++) {
116 for (int x = 0; x < srcInfo.width(); x++) {
117 dst[x] = SkPacked4444ToA32(src16[x]);
118 }
119 dst = SkTAddOffset<uint8_t>(dst, dstRB);
120 src16 = SkTAddOffset<const uint16_t>(src16, srcRB);
121 }
122 return true;
123 }
124
125 case kBGRA_8888_SkColorType:
126 case kRGBA_8888_SkColorType: {
127 auto src32 = (const uint32_t*) src;
128 for (int y = 0; y < srcInfo.height(); y++) {
129 for (int x = 0; x < srcInfo.width(); x++) {
130 dst[x] = src32[x] >> 24;
131 }
132 dst = SkTAddOffset<uint8_t>(dst, dstRB);
133 src32 = SkTAddOffset<const uint32_t>(src32, srcRB);
134 }
135 return true;
136 }
137
138 case kRGBA_1010102_SkColorType: {
139 auto src32 = (const uint32_t*) src;
140 for (int y = 0; y < srcInfo.height(); y++) {
141 for (int x = 0; x < srcInfo.width(); x++) {
142 dst[x] = (src32[x] >> 30) * 0x55;
143 }
144 dst = SkTAddOffset<uint8_t>(dst, dstRB);
145 src32 = SkTAddOffset<const uint32_t>(src32, srcRB);
146 }
147 return true;
148 }
149
150 case kRGBA_F16Norm_SkColorType:
151 case kRGBA_F16_SkColorType: {
152 auto src64 = (const uint64_t*) src;
153 for (int y = 0; y < srcInfo.height(); y++) {
154 for (int x = 0; x < srcInfo.width(); x++) {
155 dst[x] = (uint8_t) (255.0f * SkHalfToFloat(src64[x] >> 48));
156 }
157 dst = SkTAddOffset<uint8_t>(dst, dstRB);
158 src64 = SkTAddOffset<const uint64_t>(src64, srcRB);
159 }
160 return true;
161 }
162
163 case kRGBA_F32_SkColorType: {
164 auto rgba = (const float*)src;
165 for (int y = 0; y < srcInfo.height(); y++) {
166 for (int x = 0; x < srcInfo.width(); x++) {
167 dst[x] = (uint8_t)(255.0f * rgba[4*x+3]);
168 }
169 dst = SkTAddOffset<uint8_t>(dst, dstRB);
170 rgba = SkTAddOffset<const float>(rgba, srcRB);
171 }
172 return true;
173 }
174
175 case kA16_float_SkColorType: {
176 auto srcF16 = (const uint16_t*) src;
177 for (int y = 0; y < srcInfo.height(); y++) {
178 for (int x = 0; x < srcInfo.width(); x++) {
179 dst[x] = (uint8_t) (255.0f * SkHalfToFloat(srcF16[x]));
180 }
181 dst = SkTAddOffset<uint8_t>(dst, dstRB);
182 srcF16 = SkTAddOffset<const uint16_t>(srcF16, srcRB);
183 }
184 return true;
185 }
186
187 case kR16G16B16A16_unorm_SkColorType: {
188 auto src64 = (const uint64_t*) src;
189 for (int y = 0; y < srcInfo.height(); y++) {
190 for (int x = 0; x < srcInfo.width(); x++) {
191 dst[x] = (src64[x] >> 48) >> 8;
192 }
193 dst = SkTAddOffset<uint8_t>(dst, dstRB);
194 src64 = SkTAddOffset<const uint64_t>(src64, srcRB);
195 }
196 return true;
197 }
198 }
199 return false;
200 }
201
202 // Default: Use the pipeline.
convert_with_pipeline(const SkImageInfo & dstInfo,void * dstRow,size_t dstRB,const SkImageInfo & srcInfo,const void * srcRow,size_t srcRB,const SkColorSpaceXformSteps & steps)203 static void convert_with_pipeline(const SkImageInfo& dstInfo, void* dstRow, size_t dstRB,
204 const SkImageInfo& srcInfo, const void* srcRow, size_t srcRB,
205 const SkColorSpaceXformSteps& steps) {
206
207 SkRasterPipeline_MemoryCtx src = { (void*)srcRow, (int)(srcRB / srcInfo.bytesPerPixel()) },
208 dst = { (void*)dstRow, (int)(dstRB / dstInfo.bytesPerPixel()) };
209
210 SkRasterPipeline_<256> pipeline;
211 pipeline.append_load(srcInfo.colorType(), &src);
212 steps.apply(&pipeline, srcInfo.colorType());
213
214 pipeline.append_gamut_clamp_if_normalized(dstInfo);
215
216 pipeline.append_store(dstInfo.colorType(), &dst);
217 pipeline.run(0,0, srcInfo.width(), srcInfo.height());
218 }
219
SkConvertPixels(const SkImageInfo & dstInfo,void * dstPixels,size_t dstRB,const SkImageInfo & srcInfo,const void * srcPixels,size_t srcRB)220 void SkConvertPixels(const SkImageInfo& dstInfo, void* dstPixels, size_t dstRB,
221 const SkImageInfo& srcInfo, const void* srcPixels, size_t srcRB) {
222 SkASSERT(dstInfo.dimensions() == srcInfo.dimensions());
223 SkASSERT(SkImageInfoValidConversion(dstInfo, srcInfo));
224
225 SkColorSpaceXformSteps steps{srcInfo.colorSpace(), srcInfo.alphaType(),
226 dstInfo.colorSpace(), dstInfo.alphaType()};
227
228 for (auto fn : {rect_memcpy, swizzle_or_premul, convert_to_alpha8}) {
229 if (fn(dstInfo, dstPixels, dstRB, srcInfo, srcPixels, srcRB, steps)) {
230 return;
231 }
232 }
233 convert_with_pipeline(dstInfo, dstPixels, dstRB, srcInfo, srcPixels, srcRB, steps);
234 }
235