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