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1 #include "SkConfig8888.h" | 1 #include "SkConfig8888.h" |
| 2 #include "SkColorPriv.h" |
2 #include "SkMathPriv.h" | 3 #include "SkMathPriv.h" |
3 #include "SkUnPreMultiply.h" | 4 #include "SkUnPreMultiply.h" |
4 | 5 |
5 namespace { | 6 enum AlphaVerb { |
| 7 kNothing_AlphaVerb, |
| 8 kPremul_AlphaVerb, |
| 9 kUnpremul_AlphaVerb, |
| 10 }; |
6 | 11 |
7 template <int A_IDX, int R_IDX, int G_IDX, int B_IDX> | 12 template <bool doSwapRB, AlphaVerb doAlpha> uint32_t convert32(uint32_t c) { |
8 inline uint32_t pack_config8888(uint32_t a, uint32_t r, | 13 if (doSwapRB) { |
9 uint32_t g, uint32_t b) { | 14 c = SkSwizzle_RB(c); |
10 #ifdef SK_CPU_LENDIAN | 15 } |
11 return (a << (A_IDX * 8)) | (r << (R_IDX * 8)) | | 16 |
12 (g << (G_IDX * 8)) | (b << (B_IDX * 8)); | 17 // Lucky for us, in both RGBA and BGRA, the alpha component is always in the
same place, so |
13 #else | 18 // we can perform premul or unpremul the same way without knowing the swizzl
es for RGB. |
14 return (a << ((3-A_IDX) * 8)) | (r << ((3-R_IDX) * 8)) | | 19 switch (doAlpha) { |
15 (g << ((3-G_IDX) * 8)) | (b << ((3-B_IDX) * 8)); | 20 case kNothing_AlphaVerb: |
16 #endif | 21 // no change |
| 22 break; |
| 23 case kPremul_AlphaVerb: |
| 24 c = SkPreMultiplyARGB(SkGetPackedA32(c), SkGetPackedR32(c), |
| 25 SkGetPackedG32(c), SkGetPackedB32(c)); |
| 26 break; |
| 27 case kUnpremul_AlphaVerb: |
| 28 c = SkUnPreMultiply::UnPreMultiplyPreservingByteOrder(c); |
| 29 break; |
| 30 } |
| 31 return c; |
17 } | 32 } |
18 | 33 |
19 template <int A_IDX, int R_IDX, int G_IDX, int B_IDX> | 34 template <bool doSwapRB, AlphaVerb doAlpha> |
20 inline void unpack_config8888(uint32_t color, | 35 void convert32_row(uint32_t* dst, const uint32_t* src, int count) { |
21 uint32_t* a, uint32_t* r, | 36 // This has to be correct if src == dst (but not partial overlap) |
22 uint32_t* g, uint32_t* b) { | 37 for (int i = 0; i < count; ++i) { |
23 #ifdef SK_CPU_LENDIAN | 38 dst[i] = convert32<doSwapRB, doAlpha>(src[i]); |
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_ID
X, | |
56 bool IN_PM, int IN_A_IDX, int IN_R_IDX, int IN_G_IDX, int IN_B_IDX
> | |
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_ID
X, SkCanvas::Config8888 IN_CFG> | |
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_NA
TIVE_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_NA
TIVE_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>(pixe
l); | |
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>(pix
el); | |
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>(pixe
l); | |
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>(pix
el); | |
105 break; | |
106 default: | |
107 SkDEBUGFAIL("Unexpected config8888"); | |
108 return 0; | |
109 break; | |
110 } | 39 } |
111 } | 40 } |
112 | 41 |
113 template <SkCanvas::Config8888 OUT_CFG, SkCanvas::Config8888 IN_CFG> | 42 static bool is_32bit_colortype(SkColorType ct) { |
114 inline uint32_t convert_pixel(uint32_t pixel) { | 43 return kRGBA_8888_SkColorType == ct || kBGRA_8888_SkColorType == ct; |
115 switch(OUT_CFG) { | 44 } |
116 case SkCanvas::kNative_Premul_Config8888: | 45 |
117 return convert_pixel<true, SK_NATIVE_A_IDX, SK_NATIVE_R_IDX, SK_NA
TIVE_G_IDX, SK_NATIVE_B_IDX, IN_CFG>(pixel); | 46 static AlphaVerb compute_AlphaVerb(SkAlphaType src, SkAlphaType dst) { |
118 break; | 47 SkASSERT(kIgnore_SkAlphaType != src); |
119 case SkCanvas::kNative_Unpremul_Config8888: | 48 SkASSERT(kIgnore_SkAlphaType != dst); |
120 return convert_pixel<false, SK_NATIVE_A_IDX, SK_NATIVE_R_IDX, SK_N
ATIVE_G_IDX, SK_NATIVE_B_IDX, IN_CFG>(pixel); | 49 |
121 break; | 50 if (kOpaque_SkAlphaType == src || kOpaque_SkAlphaType == dst || src == dst)
{ |
122 case SkCanvas::kBGRA_Premul_Config8888: | 51 return kNothing_AlphaVerb; |
123 return convert_pixel<true, 3, 2, 1, 0, IN_CFG>(pixel); | 52 } |
124 break; | 53 if (kPremul_SkAlphaType == dst) { |
125 case SkCanvas::kBGRA_Unpremul_Config8888: | 54 SkASSERT(kUnpremul_SkAlphaType == src); |
126 return convert_pixel<false, 3, 2, 1, 0, IN_CFG>(pixel); | 55 return kPremul_AlphaVerb; |
127 break; | 56 } else { |
128 case SkCanvas::kRGBA_Premul_Config8888: | 57 SkASSERT(kPremul_SkAlphaType == src); |
129 return convert_pixel<true, 3, 0, 1, 2, IN_CFG>(pixel); | 58 SkASSERT(kUnpremul_SkAlphaType == dst); |
130 break; | 59 return kUnpremul_AlphaVerb; |
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 } | 60 } |
139 } | 61 } |
140 | 62 |
141 /** | 63 static void memcpy32_row(uint32_t* dst, const uint32_t* src, int count) { |
142 * SkConvertConfig8888Pixels has 6 * 6 possible combinations of src and dst | 64 memcpy(dst, src, count * 4); |
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> | |
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 } | 65 } |
168 | 66 |
169 template <SkCanvas::Config8888 SRC_CFG> | 67 bool SkSrcPixelInfo::convertPixelsTo(SkDstPixelInfo* dst, int width, int height)
const { |
170 inline void convert_config8888(uint32_t* dstPixels, | 68 if (width <= 0 || height <= 0) { |
171 size_t dstRowBytes, | 69 return false; |
172 SkCanvas::Config8888 dstConfig, | 70 } |
173 const uint32_t* srcPixels, | 71 |
174 size_t srcRowBytes, | 72 if (!is_32bit_colortype(fColorType) || !is_32bit_colortype(dst->fColorType))
{ |
175 int width, | 73 return false; |
176 int height) { | 74 } |
177 switch(dstConfig) { | 75 |
178 case SkCanvas::kNative_Premul_Config8888: | 76 void (*proc)(uint32_t* dst, const uint32_t* src, int count); |
179 convert_config8888<SkCanvas::kNative_Premul_Config8888, SRC_CFG>(dst
Pixels, dstRowBytes, srcPixels, srcRowBytes, width, height); | 77 AlphaVerb doAlpha = compute_AlphaVerb(fAlphaType, dst->fAlphaType); |
| 78 bool doSwapRB = fColorType != dst->fColorType; |
| 79 |
| 80 switch (doAlpha) { |
| 81 case kNothing_AlphaVerb: |
| 82 if (doSwapRB) { |
| 83 proc = convert32_row<true, kNothing_AlphaVerb>; |
| 84 } else { |
| 85 if (fPixels == dst->fPixels) { |
| 86 return true; |
| 87 } |
| 88 proc = memcpy32_row; |
| 89 } |
180 break; | 90 break; |
181 case SkCanvas::kNative_Unpremul_Config8888: | 91 case kPremul_AlphaVerb: |
182 convert_config8888<SkCanvas::kNative_Unpremul_Config8888, SRC_CFG>(d
stPixels, dstRowBytes, srcPixels, srcRowBytes, width, height); | 92 if (doSwapRB) { |
| 93 proc = convert32_row<true, kPremul_AlphaVerb>; |
| 94 } else { |
| 95 proc = convert32_row<false, kPremul_AlphaVerb>; |
| 96 } |
183 break; | 97 break; |
184 case SkCanvas::kBGRA_Premul_Config8888: | 98 case kUnpremul_AlphaVerb: |
185 convert_config8888<SkCanvas::kBGRA_Premul_Config8888, SRC_CFG>(dstPi
xels, dstRowBytes, srcPixels, srcRowBytes, width, height); | 99 if (doSwapRB) { |
186 break; | 100 proc = convert32_row<true, kUnpremul_AlphaVerb>; |
187 case SkCanvas::kBGRA_Unpremul_Config8888: | 101 } else { |
188 convert_config8888<SkCanvas::kBGRA_Unpremul_Config8888, SRC_CFG>(dst
Pixels, dstRowBytes, srcPixels, srcRowBytes, width, height); | 102 proc = convert32_row<false, kUnpremul_AlphaVerb>; |
189 break; | 103 } |
190 case SkCanvas::kRGBA_Premul_Config8888: | |
191 convert_config8888<SkCanvas::kRGBA_Premul_Config8888, SRC_CFG>(dstPi
xels, dstRowBytes, srcPixels, srcRowBytes, width, height); | |
192 break; | |
193 case SkCanvas::kRGBA_Unpremul_Config8888: | |
194 convert_config8888<SkCanvas::kRGBA_Unpremul_Config8888, SRC_CFG>(dst
Pixels, dstRowBytes, srcPixels, srcRowBytes, width, height); | |
195 break; | |
196 default: | |
197 SkDEBUGFAIL("Unexpected config8888"); | |
198 break; | 104 break; |
199 } | 105 } |
| 106 |
| 107 uint32_t* dstP = static_cast<uint32_t*>(dst->fPixels); |
| 108 const uint32_t* srcP = static_cast<const uint32_t*>(fPixels); |
| 109 size_t srcInc = fRowBytes >> 2; |
| 110 size_t dstInc = dst->fRowBytes >> 2; |
| 111 for (int y = 0; y < height; ++y) { |
| 112 proc(dstP, srcP, width); |
| 113 dstP += dstInc; |
| 114 srcP += srcInc; |
| 115 } |
| 116 return true; |
200 } | 117 } |
201 | |
202 } | |
203 | |
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, d
stRowBytes, 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, dst
RowBytes, dstConfig, srcPixels, srcRowBytes, width, height); | |
242 break; | |
243 case SkCanvas::kBGRA_Unpremul_Config8888: | |
244 convert_config8888<SkCanvas::kBGRA_Unpremul_Config8888>(dstPixels, d
stRowBytes, dstConfig, srcPixels, srcRowBytes, width, height); | |
245 break; | |
246 case SkCanvas::kRGBA_Premul_Config8888: | |
247 convert_config8888<SkCanvas::kRGBA_Premul_Config8888>(dstPixels, dst
RowBytes, dstConfig, srcPixels, srcRowBytes, width, height); | |
248 break; | |
249 case SkCanvas::kRGBA_Unpremul_Config8888: | |
250 convert_config8888<SkCanvas::kRGBA_Unpremul_Config8888>(dstPixels, d
stRowBytes, dstConfig, srcPixels, srcRowBytes, width, height); | |
251 break; | |
252 default: | |
253 SkDEBUGFAIL("Unexpected config8888"); | |
254 break; | |
255 } | |
256 } | |
257 | |
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 } | |
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