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gerrit-public.fairphone.software / platform / external / skia / 4b163ed2c22facbe8891616874ae07ba7827d9c9 / . / src / core / SkConfig8888.cpp
blob: f889f20744fa3b3f3c20189ae9ea56f31ac96a78 [file] [log] [blame]
bsalomon@google.comfb0d7412012-02-22 21:25:34 +0000[diff] [blame]1#include "SkConfig8888.h"
reed@google.com4b163ed2012-08-07 21:35:13 +0000[diff] [blame^]2#include "SkMathPriv.h"
bsalomon@google.comfb0d7412012-02-22 21:25:34 +0000[diff] [blame]3
4namespace {
5
6template <int A_IDX, int R_IDX, int G_IDX, int B_IDX>
7inline uint32_t pack_config8888(uint32_t a, uint32_t r,
8 uint32_t g, uint32_t b) {
9#ifdef SK_CPU_LENDIAN
10 return (a << (A_IDX * 8)) | (r << (R_IDX * 8)) |
11 (g << (G_IDX * 8)) | (b << (B_IDX * 8));
12#else
13 return (a << ((3-A_IDX) * 8)) | (r << ((3-R_IDX) * 8)) |
14 (g << ((3-G_IDX) * 8)) | (b << ((3-B_IDX) * 8));
15#endif
16}
17
18template <int A_IDX, int R_IDX, int G_IDX, int B_IDX>
19inline void unpack_config8888(uint32_t color,
20 uint32_t* a, uint32_t* r,
21 uint32_t* g, uint32_t* b) {
22#ifdef SK_CPU_LENDIAN
23 *a = (color >> (A_IDX * 8)) & 0xff;
24 *r = (color >> (R_IDX * 8)) & 0xff;
25 *g = (color >> (G_IDX * 8)) & 0xff;
26 *b = (color >> (B_IDX * 8)) & 0xff;
27#else
28 *a = (color >> ((3 - A_IDX) * 8)) & 0xff;
29 *r = (color >> ((3 - R_IDX) * 8)) & 0xff;
30 *g = (color >> ((3 - G_IDX) * 8)) & 0xff;
31 *b = (color >> ((3 - B_IDX) * 8)) & 0xff;
32#endif
33}
34
35#ifdef SK_CPU_LENDIAN
36 static const int SK_NATIVE_A_IDX = SK_A32_SHIFT / 8;
37 static const int SK_NATIVE_R_IDX = SK_R32_SHIFT / 8;
38 static const int SK_NATIVE_G_IDX = SK_G32_SHIFT / 8;
39 static const int SK_NATIVE_B_IDX = SK_B32_SHIFT / 8;
40#else
41 static const int SK_NATIVE_A_IDX = 3 - (SK_A32_SHIFT / 8);
42 static const int SK_NATIVE_R_IDX = 3 - (SK_R32_SHIFT / 8);
43 static const int SK_NATIVE_G_IDX = 3 - (SK_G32_SHIFT / 8);
44 static const int SK_NATIVE_B_IDX = 3 - (SK_B32_SHIFT / 8);
45#endif
46
47/**
48 * convert_pixel<OUT_CFG, IN_CFG converts a pixel value from one Config8888 to
49 * another. It is implemented by first expanding OUT_CFG to r, g, b, a indices
50 * and an is_premul bool as params to another template function. Then IN_CFG is
51 * expanded via another function call.
52 */
53
54template <bool OUT_PM, int OUT_A_IDX, int OUT_R_IDX, int OUT_G_IDX, int OUT_B_IDX,
55 bool IN_PM, int IN_A_IDX, int IN_R_IDX, int IN_G_IDX, int IN_B_IDX>
56inline uint32_t convert_pixel(uint32_t pixel) {
57 uint32_t a, r, g, b;
58 unpack_config8888<IN_A_IDX, IN_R_IDX, IN_G_IDX, IN_B_IDX>(pixel, &a, &r, &g, &b);
59 if (IN_PM && !OUT_PM) {
60 // We're doing the explicit divide to match WebKit layout
61 // test expectations. We can modify and rebaseline if there
62 // it can be shown that there is a more performant way to
63 // unpremul.
64 if (a) {
65 r = r * 0xff / a;
66 g = g * 0xff / a;
67 b = b * 0xff / a;
68 } else {
69 return 0;
70 }
71 } else if (!IN_PM && OUT_PM) {
72 // This matches WebKit's conversion which we are replacing.
73 // We can consider alternative rounding rules for performance.
74 r = SkMulDiv255Ceiling(r, a);
75 g = SkMulDiv255Ceiling(g, a);
76 b = SkMulDiv255Ceiling(b, a);
77 }
78 return pack_config8888<OUT_A_IDX, OUT_R_IDX, OUT_G_IDX, OUT_B_IDX>(a, r, g, b);
79}
80
81template <bool OUT_PM, int OUT_A_IDX, int OUT_R_IDX, int OUT_G_IDX, int OUT_B_IDX, SkCanvas::Config8888 IN_CFG>
82inline uint32_t convert_pixel(uint32_t pixel) {
83 switch(IN_CFG) {
84 case SkCanvas::kNative_Premul_Config8888:
85 return convert_pixel<OUT_PM, OUT_A_IDX, OUT_R_IDX, OUT_G_IDX, OUT_B_IDX,
86 true, SK_NATIVE_A_IDX, SK_NATIVE_R_IDX, SK_NATIVE_G_IDX, SK_NATIVE_B_IDX>(pixel);
87 break;
88 case SkCanvas::kNative_Unpremul_Config8888:
89 return convert_pixel<OUT_PM, OUT_A_IDX, OUT_R_IDX, OUT_G_IDX, OUT_B_IDX,
90 false, SK_NATIVE_A_IDX, SK_NATIVE_R_IDX, SK_NATIVE_G_IDX, SK_NATIVE_B_IDX>(pixel);
91 break;
92 case SkCanvas::kBGRA_Premul_Config8888:
93 return convert_pixel<OUT_PM, OUT_A_IDX, OUT_R_IDX, OUT_G_IDX, OUT_B_IDX,
94 true, 3, 2, 1, 0>(pixel);
95 break;
96 case SkCanvas::kBGRA_Unpremul_Config8888:
97 return convert_pixel<OUT_PM, OUT_A_IDX, OUT_R_IDX, OUT_G_IDX, OUT_B_IDX,
98 false, 3, 2, 1, 0>(pixel);
99 break;
100 case SkCanvas::kRGBA_Premul_Config8888:
101 return convert_pixel<OUT_PM, OUT_A_IDX, OUT_R_IDX, OUT_G_IDX, OUT_B_IDX,
102 true, 3, 0, 1, 2>(pixel);
103 break;
104 case SkCanvas::kRGBA_Unpremul_Config8888:
105 return convert_pixel<OUT_PM, OUT_A_IDX, OUT_R_IDX, OUT_G_IDX, OUT_B_IDX,
106 false, 3, 0, 1, 2>(pixel);
107 break;
108 default:
109 SkDEBUGFAIL("Unexpected config8888");
110 return 0;
111 break;
112 }
113}
114
115template <SkCanvas::Config8888 OUT_CFG, SkCanvas::Config8888 IN_CFG>
116inline uint32_t convert_pixel(uint32_t pixel) {
117 switch(OUT_CFG) {
118 case SkCanvas::kNative_Premul_Config8888:
119 return convert_pixel<true, SK_NATIVE_A_IDX, SK_NATIVE_R_IDX, SK_NATIVE_G_IDX, SK_NATIVE_B_IDX, IN_CFG>(pixel);
120 break;
121 case SkCanvas::kNative_Unpremul_Config8888:
122 return convert_pixel<false, SK_NATIVE_A_IDX, SK_NATIVE_R_IDX, SK_NATIVE_G_IDX, SK_NATIVE_B_IDX, IN_CFG>(pixel);
123 break;
124 case SkCanvas::kBGRA_Premul_Config8888:
125 return convert_pixel<true, 3, 2, 1, 0, IN_CFG>(pixel);
126 break;
127 case SkCanvas::kBGRA_Unpremul_Config8888:
128 return convert_pixel<false, 3, 2, 1, 0, IN_CFG>(pixel);
129 break;
130 case SkCanvas::kRGBA_Premul_Config8888:
131 return convert_pixel<true, 3, 0, 1, 2, IN_CFG>(pixel);
132 break;
133 case SkCanvas::kRGBA_Unpremul_Config8888:
134 return convert_pixel<false, 3, 0, 1, 2, IN_CFG>(pixel);
135 break;
136 default:
137 SkDEBUGFAIL("Unexpected config8888");
138 return 0;
139 break;
140 }
141}
142
143/**
144 * SkConvertConfig8888Pixels has 6 * 6 possible combinations of src and dst
145 * configs. Each is implemented as an instantiation templated function. Two
146 * levels of switch statements are used to select the correct instantiation, one
147 * for the src config and one for the dst config.
148 */
149
150template <SkCanvas::Config8888 DST_CFG, SkCanvas::Config8888 SRC_CFG>
151inline void convert_config8888(uint32_t* dstPixels,
152 size_t dstRowBytes,
153 const uint32_t* srcPixels,
154 size_t srcRowBytes,
155 int width,
156 int height) {
157 intptr_t dstPix = reinterpret_cast<intptr_t>(dstPixels);
158 intptr_t srcPix = reinterpret_cast<intptr_t>(srcPixels);
159
160 for (int y = 0; y < height; ++y) {
161 srcPixels = reinterpret_cast<const uint32_t*>(srcPix);
162 dstPixels = reinterpret_cast<uint32_t*>(dstPix);
163 for (int x = 0; x < width; ++x) {
164 dstPixels[x] = convert_pixel<DST_CFG, SRC_CFG>(srcPixels[x]);
165 }
166 dstPix += dstRowBytes;
167 srcPix += srcRowBytes;
168 }
169}
170
171template <SkCanvas::Config8888 SRC_CFG>
172inline void convert_config8888(uint32_t* dstPixels,
173 size_t dstRowBytes,
174 SkCanvas::Config8888 dstConfig,
175 const uint32_t* srcPixels,
176 size_t srcRowBytes,
177 int width,
178 int height) {
179 switch(dstConfig) {
180 case SkCanvas::kNative_Premul_Config8888:
181 convert_config8888<SkCanvas::kNative_Premul_Config8888, SRC_CFG>(dstPixels, dstRowBytes, srcPixels, srcRowBytes, width, height);
182 break;
183 case SkCanvas::kNative_Unpremul_Config8888:
184 convert_config8888<SkCanvas::kNative_Unpremul_Config8888, SRC_CFG>(dstPixels, dstRowBytes, srcPixels, srcRowBytes, width, height);
185 break;
186 case SkCanvas::kBGRA_Premul_Config8888:
187 convert_config8888<SkCanvas::kBGRA_Premul_Config8888, SRC_CFG>(dstPixels, dstRowBytes, srcPixels, srcRowBytes, width, height);
188 break;
189 case SkCanvas::kBGRA_Unpremul_Config8888:
190 convert_config8888<SkCanvas::kBGRA_Unpremul_Config8888, SRC_CFG>(dstPixels, dstRowBytes, srcPixels, srcRowBytes, width, height);
191 break;
192 case SkCanvas::kRGBA_Premul_Config8888:
193 convert_config8888<SkCanvas::kRGBA_Premul_Config8888, SRC_CFG>(dstPixels, dstRowBytes, srcPixels, srcRowBytes, width, height);
194 break;
195 case SkCanvas::kRGBA_Unpremul_Config8888:
196 convert_config8888<SkCanvas::kRGBA_Unpremul_Config8888, SRC_CFG>(dstPixels, dstRowBytes, srcPixels, srcRowBytes, width, height);
197 break;
198 default:
199 SkDEBUGFAIL("Unexpected config8888");
200 break;
201 }
202}
203
204}
205
206void SkConvertConfig8888Pixels(uint32_t* dstPixels,
207 size_t dstRowBytes,
208 SkCanvas::Config8888 dstConfig,
209 const uint32_t* srcPixels,
210 size_t srcRowBytes,
211 SkCanvas::Config8888 srcConfig,
212 int width,
213 int height) {
214 if (srcConfig == dstConfig) {
215 if (srcPixels == dstPixels) {
216 return;
217 }
218 if (dstRowBytes == srcRowBytes &&
219 4U * width == srcRowBytes) {
220 memcpy(dstPixels, srcPixels, srcRowBytes * height);
221 return;
222 } else {
223 intptr_t srcPix = reinterpret_cast<intptr_t>(srcPixels);
224 intptr_t dstPix = reinterpret_cast<intptr_t>(dstPixels);
225 for (int y = 0; y < height; ++y) {
226 srcPixels = reinterpret_cast<const uint32_t*>(srcPix);
227 dstPixels = reinterpret_cast<uint32_t*>(dstPix);
228 memcpy(dstPixels, srcPixels, 4 * width);
229 srcPix += srcRowBytes;
230 dstPix += dstRowBytes;
231 }
232 return;
233 }
234 }
235 switch(srcConfig) {
236 case SkCanvas::kNative_Premul_Config8888:
237 convert_config8888<SkCanvas::kNative_Premul_Config8888>(dstPixels, dstRowBytes, dstConfig, srcPixels, srcRowBytes, width, height);
238 break;
239 case SkCanvas::kNative_Unpremul_Config8888:
240 convert_config8888<SkCanvas::kNative_Unpremul_Config8888>(dstPixels, dstRowBytes, dstConfig, srcPixels, srcRowBytes, width, height);
241 break;
242 case SkCanvas::kBGRA_Premul_Config8888:
243 convert_config8888<SkCanvas::kBGRA_Premul_Config8888>(dstPixels, dstRowBytes, dstConfig, srcPixels, srcRowBytes, width, height);
244 break;
245 case SkCanvas::kBGRA_Unpremul_Config8888:
246 convert_config8888<SkCanvas::kBGRA_Unpremul_Config8888>(dstPixels, dstRowBytes, dstConfig, srcPixels, srcRowBytes, width, height);
247 break;
248 case SkCanvas::kRGBA_Premul_Config8888:
249 convert_config8888<SkCanvas::kRGBA_Premul_Config8888>(dstPixels, dstRowBytes, dstConfig, srcPixels, srcRowBytes, width, height);
250 break;
251 case SkCanvas::kRGBA_Unpremul_Config8888:
252 convert_config8888<SkCanvas::kRGBA_Unpremul_Config8888>(dstPixels, dstRowBytes, dstConfig, srcPixels, srcRowBytes, width, height);
253 break;
254 default:
255 SkDEBUGFAIL("Unexpected config8888");
256 break;
257 }
258}
bsalomon@google.coma91e9232012-02-23 15:39:54 +0000[diff] [blame]259
260uint32_t SkPackConfig8888(SkCanvas::Config8888 config,
261 uint32_t a,
262 uint32_t r,
263 uint32_t g,
264 uint32_t b) {
265 switch (config) {
266 case SkCanvas::kNative_Premul_Config8888:
267 case SkCanvas::kNative_Unpremul_Config8888:
268 return pack_config8888<SK_NATIVE_A_IDX,
269 SK_NATIVE_R_IDX,
270 SK_NATIVE_G_IDX,
271 SK_NATIVE_B_IDX>(a, r, g, b);
272 case SkCanvas::kBGRA_Premul_Config8888:
273 case SkCanvas::kBGRA_Unpremul_Config8888:
274 return pack_config8888<3, 2, 1, 0>(a, r, g, b);
275 case SkCanvas::kRGBA_Premul_Config8888:
276 case SkCanvas::kRGBA_Unpremul_Config8888:
277 return pack_config8888<3, 0, 1, 2>(a, r, g, b);
278 default:
279 SkDEBUGFAIL("Unexpected config8888");
280 return 0;
281 }
282}