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1 /* | 1 /* |
2 * Copyright (C) 2006 Apple Computer, Inc. All rights reserved. | 2 * Copyright (C) 2006 Apple Computer, Inc. All rights reserved. |
3 * Copyright (C) Research In Motion Limited 2009-2010. All rights reserved. | 3 * Copyright (C) Research In Motion Limited 2009-2010. All rights reserved. |
4 * | 4 * |
5 * Redistribution and use in source and binary forms, with or without | 5 * Redistribution and use in source and binary forms, with or without |
6 * modification, are permitted provided that the following conditions | 6 * modification, are permitted provided that the following conditions |
7 * are met: | 7 * are met: |
8 * 1. Redistributions of source code must retain the above copyright | 8 * 1. Redistributions of source code must retain the above copyright |
9 * notice, this list of conditions and the following disclaimer. | 9 * notice, this list of conditions and the following disclaimer. |
10 * 2. Redistributions in binary form must reproduce the above copyright | 10 * 2. Redistributions in binary form must reproduce the above copyright |
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211 } | 211 } |
212 | 212 |
213 static inline void setRGBARaw(PixelData* dest, | 213 static inline void setRGBARaw(PixelData* dest, |
214 unsigned r, | 214 unsigned r, |
215 unsigned g, | 215 unsigned g, |
216 unsigned b, | 216 unsigned b, |
217 unsigned a) { | 217 unsigned a) { |
218 *dest = SkPackARGB32NoCheck(a, r, g, b); | 218 *dest = SkPackARGB32NoCheck(a, r, g, b); |
219 } | 219 } |
220 | 220 |
| 221 inline void overRGBAPremultiply(PixelData* dest, |
| 222 unsigned r, |
| 223 unsigned g, |
| 224 unsigned b, |
| 225 unsigned a) { |
| 226 enum FractionControl { RoundFractionControl = 257 * 128 }; |
| 227 |
| 228 if (!a) |
| 229 return; |
| 230 |
| 231 if (a < 255) { |
| 232 unsigned alpha = a * 257; |
| 233 r = (r * alpha + RoundFractionControl) >> 16; |
| 234 g = (g * alpha + RoundFractionControl) >> 16; |
| 235 b = (b * alpha + RoundFractionControl) >> 16; |
| 236 *dest = SkPMSrcOver(SkPackARGB32NoCheck(a, r, g, b), *dest); |
| 237 } else { |
| 238 *dest = SkPackARGB32NoCheck(a, r, g, b); |
| 239 } |
| 240 } |
| 241 |
| 242 inline void overRGBARaw(PixelData* dest, |
| 243 unsigned r, |
| 244 unsigned g, |
| 245 unsigned b, |
| 246 unsigned a) { |
| 247 if (!a) |
| 248 return; |
| 249 |
| 250 unsigned aDest = SkGetPackedA32(*dest); |
| 251 if (aDest && a < 255) { |
| 252 unsigned u = a * 255; |
| 253 unsigned v = (255 - a) * aDest; |
| 254 unsigned alpha = u + v; |
| 255 unsigned rDest = SkGetPackedR32(*dest); |
| 256 unsigned gDest = SkGetPackedG32(*dest); |
| 257 unsigned bDest = SkGetPackedB32(*dest); |
| 258 a = (alpha + (alpha >> 8) + 1) >> 8; |
| 259 r = (r * u + rDest * v) / alpha; |
| 260 g = (g * u + gDest * v) / alpha; |
| 261 b = (b * u + bDest * v) / alpha; |
| 262 } |
| 263 *dest = SkPackARGB32NoCheck(a, r, g, b); |
| 264 } |
| 265 |
221 // Blend the RGBA pixel provided by |r|, |g|, |b|, |a| over the pixel in | 266 // Blend the RGBA pixel provided by |r|, |g|, |b|, |a| over the pixel in |
222 // |dest|, without premultiplication, and overwrite |dest| with the result. | 267 // |dest|, without premultiplication, and overwrite |dest| with the result. |
223 static inline void blendRGBARaw(PixelData* dest, | 268 static inline void blendRGBARaw(PixelData* dest, |
224 unsigned r, | 269 unsigned r, |
225 unsigned g, | 270 unsigned g, |
226 unsigned b, | 271 unsigned b, |
227 unsigned a) { | 272 unsigned a) { |
228 blendSrcOverDstRaw(dest, SkPackARGB32NoCheck(a, r, g, b)); | 273 blendSrcOverDstRaw(dest, SkPackARGB32NoCheck(a, r, g, b)); |
229 } | 274 } |
230 | 275 |
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283 // The frame that must be decoded before this frame can be decoded. | 328 // The frame that must be decoded before this frame can be decoded. |
284 // WTF::kNotFound if this frame doesn't require any previous frame. | 329 // WTF::kNotFound if this frame doesn't require any previous frame. |
285 // This is used by ImageDecoder::clearCacheExceptFrame(), and will never | 330 // This is used by ImageDecoder::clearCacheExceptFrame(), and will never |
286 // be read for image formats that do not have multiple frames. | 331 // be read for image formats that do not have multiple frames. |
287 size_t m_requiredPreviousFrameIndex; | 332 size_t m_requiredPreviousFrameIndex; |
288 }; | 333 }; |
289 | 334 |
290 } // namespace blink | 335 } // namespace blink |
291 | 336 |
292 #endif | 337 #endif |
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