• Home
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
1 #include "SkConfig8888.h"
2 #include "SkMathPriv.h"
3 #include "SkUnPreMultiply.h"
4 
5 namespace {
6 
7 template <int A_IDX, int R_IDX, int G_IDX, int B_IDX>
pack_config8888(uint32_t a,uint32_t r,uint32_t g,uint32_t b)8 inline uint32_t pack_config8888(uint32_t a, uint32_t r,
9                                 uint32_t g, uint32_t b) {
10 #ifdef SK_CPU_LENDIAN
11     return (a << (A_IDX * 8)) | (r << (R_IDX * 8)) |
12            (g << (G_IDX * 8)) | (b << (B_IDX * 8));
13 #else
14     return (a << ((3-A_IDX) * 8)) | (r << ((3-R_IDX) * 8)) |
15            (g << ((3-G_IDX) * 8)) | (b << ((3-B_IDX) * 8));
16 #endif
17 }
18 
19 template <int A_IDX, int R_IDX, int G_IDX, int B_IDX>
unpack_config8888(uint32_t color,uint32_t * a,uint32_t * r,uint32_t * g,uint32_t * b)20 inline void unpack_config8888(uint32_t color,
21                               uint32_t* a, uint32_t* r,
22                               uint32_t* g, uint32_t* b) {
23 #ifdef SK_CPU_LENDIAN
24     *a = (color >> (A_IDX * 8)) & 0xff;
25     *r = (color >> (R_IDX * 8)) & 0xff;
26     *g = (color >> (G_IDX * 8)) & 0xff;
27     *b = (color >> (B_IDX * 8)) & 0xff;
28 #else
29     *a = (color >> ((3 - A_IDX) * 8)) & 0xff;
30     *r = (color >> ((3 - R_IDX) * 8)) & 0xff;
31     *g = (color >> ((3 - G_IDX) * 8)) & 0xff;
32     *b = (color >> ((3 - B_IDX) * 8)) & 0xff;
33 #endif
34 }
35 
36 #ifdef SK_CPU_LENDIAN
37     static const int SK_NATIVE_A_IDX = SK_A32_SHIFT / 8;
38     static const int SK_NATIVE_R_IDX = SK_R32_SHIFT / 8;
39     static const int SK_NATIVE_G_IDX = SK_G32_SHIFT / 8;
40     static const int SK_NATIVE_B_IDX = SK_B32_SHIFT / 8;
41 #else
42     static const int SK_NATIVE_A_IDX = 3 - (SK_A32_SHIFT / 8);
43     static const int SK_NATIVE_R_IDX = 3 - (SK_R32_SHIFT / 8);
44     static const int SK_NATIVE_G_IDX = 3 - (SK_G32_SHIFT / 8);
45     static const int SK_NATIVE_B_IDX = 3 - (SK_B32_SHIFT / 8);
46 #endif
47 
48 /**
49  * convert_pixel<OUT_CFG, IN_CFG converts a pixel value from one Config8888 to
50  * another. It is implemented by first expanding OUT_CFG to r, g, b, a indices
51  * and an is_premul bool as params to another template function. Then IN_CFG is
52  * expanded via another function call.
53  */
54 
55 template <bool OUT_PM, int OUT_A_IDX, int OUT_R_IDX, int OUT_G_IDX, int OUT_B_IDX,
56           bool IN_PM,  int IN_A_IDX,  int IN_R_IDX,  int IN_G_IDX,  int IN_B_IDX>
convert_pixel(uint32_t pixel)57 inline uint32_t convert_pixel(uint32_t pixel) {
58     uint32_t a, r, g, b;
59     unpack_config8888<IN_A_IDX, IN_R_IDX, IN_G_IDX, IN_B_IDX>(pixel, &a, &r, &g, &b);
60     if (IN_PM && !OUT_PM) {
61         // Using SkUnPreMultiply::ApplyScale is faster than (value * 0xff) / a.
62         if (a) {
63             SkUnPreMultiply::Scale scale = SkUnPreMultiply::GetScale(a);
64             r = SkUnPreMultiply::ApplyScale(scale, r);
65             g = SkUnPreMultiply::ApplyScale(scale, g);
66             b = SkUnPreMultiply::ApplyScale(scale, b);
67         } else {
68             return 0;
69         }
70     } else if (!IN_PM && OUT_PM) {
71         // This matches SkUnPreMultiply conversion which we are replacing.
72         r = SkMulDiv255Round(r, a);
73         g = SkMulDiv255Round(g, a);
74         b = SkMulDiv255Round(b, a);
75     }
76     return pack_config8888<OUT_A_IDX, OUT_R_IDX, OUT_G_IDX, OUT_B_IDX>(a, r, g, b);
77 }
78 
79 template <bool OUT_PM, int OUT_A_IDX, int OUT_R_IDX, int OUT_G_IDX, int OUT_B_IDX, SkCanvas::Config8888 IN_CFG>
convert_pixel(uint32_t pixel)80 inline uint32_t convert_pixel(uint32_t pixel) {
81     switch(IN_CFG) {
82         case SkCanvas::kNative_Premul_Config8888:
83             return convert_pixel<OUT_PM, OUT_A_IDX,       OUT_R_IDX,       OUT_G_IDX,       OUT_B_IDX,
84                                  true,  SK_NATIVE_A_IDX,  SK_NATIVE_R_IDX, SK_NATIVE_G_IDX, SK_NATIVE_B_IDX>(pixel);
85             break;
86         case SkCanvas::kNative_Unpremul_Config8888:
87             return convert_pixel<OUT_PM, OUT_A_IDX,       OUT_R_IDX,       OUT_G_IDX,       OUT_B_IDX,
88                                  false,  SK_NATIVE_A_IDX, SK_NATIVE_R_IDX, SK_NATIVE_G_IDX, SK_NATIVE_B_IDX>(pixel);
89             break;
90         case SkCanvas::kBGRA_Premul_Config8888:
91             return convert_pixel<OUT_PM, OUT_A_IDX, OUT_R_IDX, OUT_G_IDX, OUT_B_IDX,
92                                  true,  3,         2,         1,         0>(pixel);
93             break;
94         case SkCanvas::kBGRA_Unpremul_Config8888:
95             return convert_pixel<OUT_PM, OUT_A_IDX, OUT_R_IDX, OUT_G_IDX, OUT_B_IDX,
96                                  false,  3,         2,         1,         0>(pixel);
97             break;
98         case SkCanvas::kRGBA_Premul_Config8888:
99             return convert_pixel<OUT_PM, OUT_A_IDX, OUT_R_IDX, OUT_G_IDX, OUT_B_IDX,
100                                  true,  3,         0,         1,         2>(pixel);
101             break;
102         case SkCanvas::kRGBA_Unpremul_Config8888:
103             return convert_pixel<OUT_PM, OUT_A_IDX, OUT_R_IDX, OUT_G_IDX, OUT_B_IDX,
104                                  false,  3,         0,         1,         2>(pixel);
105             break;
106         default:
107             SkDEBUGFAIL("Unexpected config8888");
108             return 0;
109             break;
110     }
111 }
112 
113 template <SkCanvas::Config8888 OUT_CFG, SkCanvas::Config8888 IN_CFG>
convert_pixel(uint32_t pixel)114 inline uint32_t convert_pixel(uint32_t pixel) {
115     switch(OUT_CFG) {
116         case SkCanvas::kNative_Premul_Config8888:
117             return convert_pixel<true,  SK_NATIVE_A_IDX,  SK_NATIVE_R_IDX, SK_NATIVE_G_IDX, SK_NATIVE_B_IDX, IN_CFG>(pixel);
118             break;
119         case SkCanvas::kNative_Unpremul_Config8888:
120             return convert_pixel<false,  SK_NATIVE_A_IDX,  SK_NATIVE_R_IDX, SK_NATIVE_G_IDX, SK_NATIVE_B_IDX, IN_CFG>(pixel);
121             break;
122         case SkCanvas::kBGRA_Premul_Config8888:
123             return convert_pixel<true, 3, 2, 1, 0, IN_CFG>(pixel);
124             break;
125         case SkCanvas::kBGRA_Unpremul_Config8888:
126             return convert_pixel<false, 3, 2, 1, 0, IN_CFG>(pixel);
127             break;
128         case SkCanvas::kRGBA_Premul_Config8888:
129             return convert_pixel<true, 3, 0, 1, 2, IN_CFG>(pixel);
130             break;
131         case SkCanvas::kRGBA_Unpremul_Config8888:
132             return convert_pixel<false, 3, 0, 1, 2, IN_CFG>(pixel);
133             break;
134         default:
135             SkDEBUGFAIL("Unexpected config8888");
136             return 0;
137             break;
138     }
139 }
140 
141 /**
142  * SkConvertConfig8888Pixels has 6 * 6 possible combinations of src and dst
143  * configs. Each is implemented as an instantiation templated function. Two
144  * levels of switch statements are used to select the correct instantiation, one
145  * for the src config and one for the dst config.
146  */
147 
148 template <SkCanvas::Config8888 DST_CFG, SkCanvas::Config8888 SRC_CFG>
convert_config8888(uint32_t * dstPixels,size_t dstRowBytes,const uint32_t * srcPixels,size_t srcRowBytes,int width,int height)149 inline void convert_config8888(uint32_t* dstPixels,
150                                size_t dstRowBytes,
151                                const uint32_t* srcPixels,
152                                size_t srcRowBytes,
153                                int width,
154                                int height) {
155     intptr_t dstPix = reinterpret_cast<intptr_t>(dstPixels);
156     intptr_t srcPix = reinterpret_cast<intptr_t>(srcPixels);
157 
158     for (int y = 0; y < height; ++y) {
159         srcPixels = reinterpret_cast<const uint32_t*>(srcPix);
160         dstPixels = reinterpret_cast<uint32_t*>(dstPix);
161         for (int x = 0; x < width; ++x) {
162             dstPixels[x] = convert_pixel<DST_CFG, SRC_CFG>(srcPixels[x]);
163         }
164         dstPix += dstRowBytes;
165         srcPix += srcRowBytes;
166     }
167 }
168 
169 template <SkCanvas::Config8888 SRC_CFG>
convert_config8888(uint32_t * dstPixels,size_t dstRowBytes,SkCanvas::Config8888 dstConfig,const uint32_t * srcPixels,size_t srcRowBytes,int width,int height)170 inline void convert_config8888(uint32_t* dstPixels,
171                                size_t dstRowBytes,
172                                SkCanvas::Config8888 dstConfig,
173                                const uint32_t* srcPixels,
174                                size_t srcRowBytes,
175                                int width,
176                                int height) {
177     switch(dstConfig) {
178         case SkCanvas::kNative_Premul_Config8888:
179             convert_config8888<SkCanvas::kNative_Premul_Config8888, SRC_CFG>(dstPixels, dstRowBytes, srcPixels, srcRowBytes, width, height);
180             break;
181         case SkCanvas::kNative_Unpremul_Config8888:
182             convert_config8888<SkCanvas::kNative_Unpremul_Config8888, SRC_CFG>(dstPixels, dstRowBytes, srcPixels, srcRowBytes, width, height);
183             break;
184         case SkCanvas::kBGRA_Premul_Config8888:
185             convert_config8888<SkCanvas::kBGRA_Premul_Config8888, SRC_CFG>(dstPixels, dstRowBytes, srcPixels, srcRowBytes, width, height);
186             break;
187         case SkCanvas::kBGRA_Unpremul_Config8888:
188             convert_config8888<SkCanvas::kBGRA_Unpremul_Config8888, SRC_CFG>(dstPixels, dstRowBytes, srcPixels, srcRowBytes, width, height);
189             break;
190         case SkCanvas::kRGBA_Premul_Config8888:
191             convert_config8888<SkCanvas::kRGBA_Premul_Config8888, SRC_CFG>(dstPixels, dstRowBytes, srcPixels, srcRowBytes, width, height);
192             break;
193         case SkCanvas::kRGBA_Unpremul_Config8888:
194             convert_config8888<SkCanvas::kRGBA_Unpremul_Config8888, SRC_CFG>(dstPixels, dstRowBytes, srcPixels, srcRowBytes, width, height);
195             break;
196         default:
197             SkDEBUGFAIL("Unexpected config8888");
198             break;
199     }
200 }
201 
202 }
203 
SkConvertConfig8888Pixels(uint32_t * dstPixels,size_t dstRowBytes,SkCanvas::Config8888 dstConfig,const uint32_t * srcPixels,size_t srcRowBytes,SkCanvas::Config8888 srcConfig,int width,int height)204 void SkConvertConfig8888Pixels(uint32_t* dstPixels,
205                                size_t dstRowBytes,
206                                SkCanvas::Config8888 dstConfig,
207                                const uint32_t* srcPixels,
208                                size_t srcRowBytes,
209                                SkCanvas::Config8888 srcConfig,
210                                int width,
211                                int height) {
212     if (srcConfig == dstConfig) {
213         if (srcPixels == dstPixels) {
214             return;
215         }
216         if (dstRowBytes == srcRowBytes &&
217             4U * width == srcRowBytes) {
218             memcpy(dstPixels, srcPixels, srcRowBytes * height);
219             return;
220         } else {
221             intptr_t srcPix = reinterpret_cast<intptr_t>(srcPixels);
222             intptr_t dstPix = reinterpret_cast<intptr_t>(dstPixels);
223             for (int y = 0; y < height; ++y) {
224                 srcPixels = reinterpret_cast<const uint32_t*>(srcPix);
225                 dstPixels = reinterpret_cast<uint32_t*>(dstPix);
226                 memcpy(dstPixels, srcPixels, 4 * width);
227                 srcPix += srcRowBytes;
228                 dstPix += dstRowBytes;
229             }
230             return;
231         }
232     }
233     switch(srcConfig) {
234         case SkCanvas::kNative_Premul_Config8888:
235             convert_config8888<SkCanvas::kNative_Premul_Config8888>(dstPixels, dstRowBytes, dstConfig, srcPixels, srcRowBytes, width, height);
236             break;
237         case SkCanvas::kNative_Unpremul_Config8888:
238             convert_config8888<SkCanvas::kNative_Unpremul_Config8888>(dstPixels, dstRowBytes, dstConfig, srcPixels, srcRowBytes, width, height);
239             break;
240         case SkCanvas::kBGRA_Premul_Config8888:
241             convert_config8888<SkCanvas::kBGRA_Premul_Config8888>(dstPixels, dstRowBytes, dstConfig, srcPixels, srcRowBytes, width, height);
242             break;
243         case SkCanvas::kBGRA_Unpremul_Config8888:
244             convert_config8888<SkCanvas::kBGRA_Unpremul_Config8888>(dstPixels, dstRowBytes, dstConfig, srcPixels, srcRowBytes, width, height);
245             break;
246         case SkCanvas::kRGBA_Premul_Config8888:
247             convert_config8888<SkCanvas::kRGBA_Premul_Config8888>(dstPixels, dstRowBytes, dstConfig, srcPixels, srcRowBytes, width, height);
248             break;
249         case SkCanvas::kRGBA_Unpremul_Config8888:
250             convert_config8888<SkCanvas::kRGBA_Unpremul_Config8888>(dstPixels, dstRowBytes, dstConfig, srcPixels, srcRowBytes, width, height);
251             break;
252         default:
253             SkDEBUGFAIL("Unexpected config8888");
254             break;
255     }
256 }
257 
SkPackConfig8888(SkCanvas::Config8888 config,uint32_t a,uint32_t r,uint32_t g,uint32_t b)258 uint32_t SkPackConfig8888(SkCanvas::Config8888 config,
259                           uint32_t a,
260                           uint32_t r,
261                           uint32_t g,
262                           uint32_t b) {
263     switch (config) {
264         case SkCanvas::kNative_Premul_Config8888:
265         case SkCanvas::kNative_Unpremul_Config8888:
266             return pack_config8888<SK_NATIVE_A_IDX,
267                                    SK_NATIVE_R_IDX,
268                                    SK_NATIVE_G_IDX,
269                                    SK_NATIVE_B_IDX>(a, r, g, b);
270         case SkCanvas::kBGRA_Premul_Config8888:
271         case SkCanvas::kBGRA_Unpremul_Config8888:
272             return pack_config8888<3, 2, 1, 0>(a, r, g, b);
273         case SkCanvas::kRGBA_Premul_Config8888:
274         case SkCanvas::kRGBA_Unpremul_Config8888:
275             return pack_config8888<3, 0, 1, 2>(a, r, g, b);
276         default:
277             SkDEBUGFAIL("Unexpected config8888");
278             return 0;
279     }
280 }
281