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gerrit-public.fairphone.software / platform / external / skqp / 61c49f357a03f68c12c2650ac9915657298352a4 / . / src / core / SkConfig8888.cpp
blob: dd5cbc47240cb3379bc7796fbc37547a70394e40 [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"
commit-bot@chromium.org61c49f32013-06-14 13:38:56 +0000[diff] [blame^]3#include "SkUnPreMultiply.h"
bsalomon@google.comfb0d7412012-02-22 21:25:34 +0000[diff] [blame]4
5namespace {
6
7template <int A_IDX, int R_IDX, int G_IDX, int B_IDX>
8inline 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
19template <int A_IDX, int R_IDX, int G_IDX, int B_IDX>
20inline 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
55template <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>
57inline 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) {
commit-bot@chromium.org61c49f32013-06-14 13:38:56 +0000[diff] [blame^]61 // Using SkUnPreMultiply::ApplyScale is faster than (value * 0xff) / a.
bsalomon@google.comfb0d7412012-02-22 21:25:34 +0000[diff] [blame]62 if (a) {
commit-bot@chromium.org61c49f32013-06-14 13:38:56 +0000[diff] [blame^]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);
bsalomon@google.comfb0d7412012-02-22 21:25:34 +0000[diff] [blame]67 } else {
68 return 0;
69 }
70 } else if (!IN_PM && OUT_PM) {
commit-bot@chromium.org61c49f32013-06-14 13:38:56 +0000[diff] [blame^]71 // This matches SkUnPreMultiply conversion which we are replacing.
72 r = SkMulDiv255Round(r, a);
73 g = SkMulDiv255Round(g, a);
74 b = SkMulDiv255Round(b, a);
bsalomon@google.comfb0d7412012-02-22 21:25:34 +0000[diff] [blame]75 }
76 return pack_config8888<OUT_A_IDX, OUT_R_IDX, OUT_G_IDX, OUT_B_IDX>(a, r, g, b);
77}
78
79template <bool OUT_PM, int OUT_A_IDX, int OUT_R_IDX, int OUT_G_IDX, int OUT_B_IDX, SkCanvas::Config8888 IN_CFG>
80inline 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
113template <SkCanvas::Config8888 OUT_CFG, SkCanvas::Config8888 IN_CFG>
114inline 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
148template <SkCanvas::Config8888 DST_CFG, SkCanvas::Config8888 SRC_CFG>
149inline 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
169template <SkCanvas::Config8888 SRC_CFG>
170inline 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
204void 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}
bsalomon@google.coma91e9232012-02-23 15:39:54 +0000[diff] [blame]257
258uint32_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}