// Copyright 2013 Google Inc. All Rights Reserved. // // Use of this source code is governed by a BSD-style license // that can be found in the COPYING file in the root of the source // tree. An additional intellectual property rights grant can be found // in the file PATENTS. All contributing project authors may // be found in the AUTHORS file in the root of the source tree. // ----------------------------------------------------------------------------- // // Utilities for processing transparent channel. // // Author: Skal ([email protected]) #include <assert.h> #include "src/dsp/dsp.h" // Tables can be faster on some platform but incur some extra binary size (~2k). #if !defined(USE_TABLES_FOR_ALPHA_MULT) #define USE_TABLES_FOR_ALPHA_MULT … #endif // ----------------------------------------------------------------------------- #define MFIX … #define HALF … #define KINV_255 … static uint32_t Mult(uint8_t x, uint32_t mult) { … } #if (USE_TABLES_FOR_ALPHA_MULT == 1) static const uint32_t kMultTables[2][256] = { { // (255u << MFIX) / alpha 0x00000000, 0xff000000, 0x7f800000, 0x55000000, 0x3fc00000, 0x33000000, 0x2a800000, 0x246db6db, 0x1fe00000, 0x1c555555, 0x19800000, 0x172e8ba2, 0x15400000, 0x139d89d8, 0x1236db6d, 0x11000000, 0x0ff00000, 0x0f000000, 0x0e2aaaaa, 0x0d6bca1a, 0x0cc00000, 0x0c249249, 0x0b9745d1, 0x0b1642c8, 0x0aa00000, 0x0a333333, 0x09cec4ec, 0x0971c71c, 0x091b6db6, 0x08cb08d3, 0x08800000, 0x0839ce73, 0x07f80000, 0x07ba2e8b, 0x07800000, 0x07492492, 0x07155555, 0x06e45306, 0x06b5e50d, 0x0689d89d, 0x06600000, 0x063831f3, 0x06124924, 0x05ee23b8, 0x05cba2e8, 0x05aaaaaa, 0x058b2164, 0x056cefa8, 0x05500000, 0x05343eb1, 0x05199999, 0x05000000, 0x04e76276, 0x04cfb2b7, 0x04b8e38e, 0x04a2e8ba, 0x048db6db, 0x0479435e, 0x04658469, 0x045270d0, 0x04400000, 0x042e29f7, 0x041ce739, 0x040c30c3, 0x03fc0000, 0x03ec4ec4, 0x03dd1745, 0x03ce540f, 0x03c00000, 0x03b21642, 0x03a49249, 0x03976fc6, 0x038aaaaa, 0x037e3f1f, 0x03722983, 0x03666666, 0x035af286, 0x034fcace, 0x0344ec4e, 0x033a5440, 0x03300000, 0x0325ed09, 0x031c18f9, 0x0312818a, 0x03092492, 0x03000000, 0x02f711dc, 0x02ee5846, 0x02e5d174, 0x02dd7baf, 0x02d55555, 0x02cd5cd5, 0x02c590b2, 0x02bdef7b, 0x02b677d4, 0x02af286b, 0x02a80000, 0x02a0fd5c, 0x029a1f58, 0x029364d9, 0x028ccccc, 0x0286562d, 0x02800000, 0x0279c952, 0x0273b13b, 0x026db6db, 0x0267d95b, 0x026217ec, 0x025c71c7, 0x0256e62a, 0x0251745d, 0x024c1bac, 0x0246db6d, 0x0241b2f9, 0x023ca1af, 0x0237a6f4, 0x0232c234, 0x022df2df, 0x02293868, 0x02249249, 0x02200000, 0x021b810e, 0x021714fb, 0x0212bb51, 0x020e739c, 0x020a3d70, 0x02061861, 0x02020408, 0x01fe0000, 0x01fa0be8, 0x01f62762, 0x01f25213, 0x01ee8ba2, 0x01ead3ba, 0x01e72a07, 0x01e38e38, 0x01e00000, 0x01dc7f10, 0x01d90b21, 0x01d5a3e9, 0x01d24924, 0x01cefa8d, 0x01cbb7e3, 0x01c880e5, 0x01c55555, 0x01c234f7, 0x01bf1f8f, 0x01bc14e5, 0x01b914c1, 0x01b61eed, 0x01b33333, 0x01b05160, 0x01ad7943, 0x01aaaaaa, 0x01a7e567, 0x01a5294a, 0x01a27627, 0x019fcbd2, 0x019d2a20, 0x019a90e7, 0x01980000, 0x01957741, 0x0192f684, 0x01907da4, 0x018e0c7c, 0x018ba2e8, 0x018940c5, 0x0186e5f0, 0x01849249, 0x018245ae, 0x01800000, 0x017dc11f, 0x017b88ee, 0x0179574e, 0x01772c23, 0x01750750, 0x0172e8ba, 0x0170d045, 0x016ebdd7, 0x016cb157, 0x016aaaaa, 0x0168a9b9, 0x0166ae6a, 0x0164b8a7, 0x0162c859, 0x0160dd67, 0x015ef7bd, 0x015d1745, 0x015b3bea, 0x01596596, 0x01579435, 0x0155c7b4, 0x01540000, 0x01523d03, 0x01507eae, 0x014ec4ec, 0x014d0fac, 0x014b5edc, 0x0149b26c, 0x01480a4a, 0x01466666, 0x0144c6af, 0x01432b16, 0x0141938b, 0x01400000, 0x013e7063, 0x013ce4a9, 0x013b5cc0, 0x0139d89d, 0x01385830, 0x0136db6d, 0x01356246, 0x0133ecad, 0x01327a97, 0x01310bf6, 0x012fa0be, 0x012e38e3, 0x012cd459, 0x012b7315, 0x012a150a, 0x0128ba2e, 0x01276276, 0x01260dd6, 0x0124bc44, 0x01236db6, 0x01222222, 0x0120d97c, 0x011f93bc, 0x011e50d7, 0x011d10c4, 0x011bd37a, 0x011a98ef, 0x0119611a, 0x01182bf2, 0x0116f96f, 0x0115c988, 0x01149c34, 0x0113716a, 0x01124924, 0x01112358, 0x01100000, 0x010edf12, 0x010dc087, 0x010ca458, 0x010b8a7d, 0x010a72f0, 0x01095da8, 0x01084a9f, 0x010739ce, 0x01062b2e, 0x01051eb8, 0x01041465, 0x01030c30, 0x01020612, 0x01010204, 0x01000000 }, { // alpha * KINV_255 0x00000000, 0x00010101, 0x00020202, 0x00030303, 0x00040404, 0x00050505, 0x00060606, 0x00070707, 0x00080808, 0x00090909, 0x000a0a0a, 0x000b0b0b, 0x000c0c0c, 0x000d0d0d, 0x000e0e0e, 0x000f0f0f, 0x00101010, 0x00111111, 0x00121212, 0x00131313, 0x00141414, 0x00151515, 0x00161616, 0x00171717, 0x00181818, 0x00191919, 0x001a1a1a, 0x001b1b1b, 0x001c1c1c, 0x001d1d1d, 0x001e1e1e, 0x001f1f1f, 0x00202020, 0x00212121, 0x00222222, 0x00232323, 0x00242424, 0x00252525, 0x00262626, 0x00272727, 0x00282828, 0x00292929, 0x002a2a2a, 0x002b2b2b, 0x002c2c2c, 0x002d2d2d, 0x002e2e2e, 0x002f2f2f, 0x00303030, 0x00313131, 0x00323232, 0x00333333, 0x00343434, 0x00353535, 0x00363636, 0x00373737, 0x00383838, 0x00393939, 0x003a3a3a, 0x003b3b3b, 0x003c3c3c, 0x003d3d3d, 0x003e3e3e, 0x003f3f3f, 0x00404040, 0x00414141, 0x00424242, 0x00434343, 0x00444444, 0x00454545, 0x00464646, 0x00474747, 0x00484848, 0x00494949, 0x004a4a4a, 0x004b4b4b, 0x004c4c4c, 0x004d4d4d, 0x004e4e4e, 0x004f4f4f, 0x00505050, 0x00515151, 0x00525252, 0x00535353, 0x00545454, 0x00555555, 0x00565656, 0x00575757, 0x00585858, 0x00595959, 0x005a5a5a, 0x005b5b5b, 0x005c5c5c, 0x005d5d5d, 0x005e5e5e, 0x005f5f5f, 0x00606060, 0x00616161, 0x00626262, 0x00636363, 0x00646464, 0x00656565, 0x00666666, 0x00676767, 0x00686868, 0x00696969, 0x006a6a6a, 0x006b6b6b, 0x006c6c6c, 0x006d6d6d, 0x006e6e6e, 0x006f6f6f, 0x00707070, 0x00717171, 0x00727272, 0x00737373, 0x00747474, 0x00757575, 0x00767676, 0x00777777, 0x00787878, 0x00797979, 0x007a7a7a, 0x007b7b7b, 0x007c7c7c, 0x007d7d7d, 0x007e7e7e, 0x007f7f7f, 0x00808080, 0x00818181, 0x00828282, 0x00838383, 0x00848484, 0x00858585, 0x00868686, 0x00878787, 0x00888888, 0x00898989, 0x008a8a8a, 0x008b8b8b, 0x008c8c8c, 0x008d8d8d, 0x008e8e8e, 0x008f8f8f, 0x00909090, 0x00919191, 0x00929292, 0x00939393, 0x00949494, 0x00959595, 0x00969696, 0x00979797, 0x00989898, 0x00999999, 0x009a9a9a, 0x009b9b9b, 0x009c9c9c, 0x009d9d9d, 0x009e9e9e, 0x009f9f9f, 0x00a0a0a0, 0x00a1a1a1, 0x00a2a2a2, 0x00a3a3a3, 0x00a4a4a4, 0x00a5a5a5, 0x00a6a6a6, 0x00a7a7a7, 0x00a8a8a8, 0x00a9a9a9, 0x00aaaaaa, 0x00ababab, 0x00acacac, 0x00adadad, 0x00aeaeae, 0x00afafaf, 0x00b0b0b0, 0x00b1b1b1, 0x00b2b2b2, 0x00b3b3b3, 0x00b4b4b4, 0x00b5b5b5, 0x00b6b6b6, 0x00b7b7b7, 0x00b8b8b8, 0x00b9b9b9, 0x00bababa, 0x00bbbbbb, 0x00bcbcbc, 0x00bdbdbd, 0x00bebebe, 0x00bfbfbf, 0x00c0c0c0, 0x00c1c1c1, 0x00c2c2c2, 0x00c3c3c3, 0x00c4c4c4, 0x00c5c5c5, 0x00c6c6c6, 0x00c7c7c7, 0x00c8c8c8, 0x00c9c9c9, 0x00cacaca, 0x00cbcbcb, 0x00cccccc, 0x00cdcdcd, 0x00cecece, 0x00cfcfcf, 0x00d0d0d0, 0x00d1d1d1, 0x00d2d2d2, 0x00d3d3d3, 0x00d4d4d4, 0x00d5d5d5, 0x00d6d6d6, 0x00d7d7d7, 0x00d8d8d8, 0x00d9d9d9, 0x00dadada, 0x00dbdbdb, 0x00dcdcdc, 0x00dddddd, 0x00dedede, 0x00dfdfdf, 0x00e0e0e0, 0x00e1e1e1, 0x00e2e2e2, 0x00e3e3e3, 0x00e4e4e4, 0x00e5e5e5, 0x00e6e6e6, 0x00e7e7e7, 0x00e8e8e8, 0x00e9e9e9, 0x00eaeaea, 0x00ebebeb, 0x00ececec, 0x00ededed, 0x00eeeeee, 0x00efefef, 0x00f0f0f0, 0x00f1f1f1, 0x00f2f2f2, 0x00f3f3f3, 0x00f4f4f4, 0x00f5f5f5, 0x00f6f6f6, 0x00f7f7f7, 0x00f8f8f8, 0x00f9f9f9, 0x00fafafa, 0x00fbfbfb, 0x00fcfcfc, 0x00fdfdfd, 0x00fefefe, 0x00ffffff } }; static WEBP_INLINE uint32_t GetScale(uint32_t a, int inverse) { return kMultTables[!inverse][a]; } #else static WEBP_INLINE uint32_t GetScale(uint32_t a, int inverse) { … } #endif // USE_TABLES_FOR_ALPHA_MULT void WebPMultARGBRow_C(uint32_t* const ptr, int width, int inverse) { … } void WebPMultRow_C(uint8_t* WEBP_RESTRICT const ptr, const uint8_t* WEBP_RESTRICT const alpha, int width, int inverse) { … } #undef KINV_255 #undef HALF #undef MFIX void (*WebPMultARGBRow)(uint32_t* const ptr, int width, int inverse); void (*WebPMultRow)(uint8_t* WEBP_RESTRICT const ptr, const uint8_t* WEBP_RESTRICT const alpha, int width, int inverse); //------------------------------------------------------------------------------ // Generic per-plane calls void WebPMultARGBRows(uint8_t* ptr, int stride, int width, int num_rows, int inverse) { … } void WebPMultRows(uint8_t* WEBP_RESTRICT ptr, int stride, const uint8_t* WEBP_RESTRICT alpha, int alpha_stride, int width, int num_rows, int inverse) { … } //------------------------------------------------------------------------------ // Premultiplied modes // non dithered-modes // (x * a * 32897) >> 23 is bit-wise equivalent to (int)(x * a / 255.) // for all 8bit x or a. For bit-wise equivalence to (int)(x * a / 255. + .5), // one can use instead: (x * a * 65793 + (1 << 23)) >> 24 #if 1 // (int)(x * a / 255.) #define MULTIPLIER … #define PREMULTIPLY … #else // (int)(x * a / 255. + .5) #define MULTIPLIER … #define PREMULTIPLY … #endif #if !WEBP_NEON_OMIT_C_CODE static void ApplyAlphaMultiply_C(uint8_t* rgba, int alpha_first, int w, int h, int stride) { … } #endif // !WEBP_NEON_OMIT_C_CODE #undef MULTIPLIER #undef PREMULTIPLY // rgbA4444 #define MULTIPLIER … static WEBP_INLINE uint8_t dither_hi(uint8_t x) { … } static WEBP_INLINE uint8_t dither_lo(uint8_t x) { … } static WEBP_INLINE uint8_t multiply(uint8_t x, uint32_t m) { … } static WEBP_INLINE void ApplyAlphaMultiply4444_C(uint8_t* rgba4444, int w, int h, int stride, int rg_byte_pos /* 0 or 1 */) { … } #undef MULTIPLIER static void ApplyAlphaMultiply_16b_C(uint8_t* rgba4444, int w, int h, int stride) { … } #if !WEBP_NEON_OMIT_C_CODE static int DispatchAlpha_C(const uint8_t* WEBP_RESTRICT alpha, int alpha_stride, int width, int height, uint8_t* WEBP_RESTRICT dst, int dst_stride) { … } static void DispatchAlphaToGreen_C(const uint8_t* WEBP_RESTRICT alpha, int alpha_stride, int width, int height, uint32_t* WEBP_RESTRICT dst, int dst_stride) { … } static int ExtractAlpha_C(const uint8_t* WEBP_RESTRICT argb, int argb_stride, int width, int height, uint8_t* WEBP_RESTRICT alpha, int alpha_stride) { … } static void ExtractGreen_C(const uint32_t* WEBP_RESTRICT argb, uint8_t* WEBP_RESTRICT alpha, int size) { … } #endif // !WEBP_NEON_OMIT_C_CODE //------------------------------------------------------------------------------ static int HasAlpha8b_C(const uint8_t* src, int length) { … } static int HasAlpha32b_C(const uint8_t* src, int length) { … } static void AlphaReplace_C(uint32_t* src, int length, uint32_t color) { … } //------------------------------------------------------------------------------ // Simple channel manipulations. static WEBP_INLINE uint32_t MakeARGB32(int a, int r, int g, int b) { … } #ifdef WORDS_BIGENDIAN static void PackARGB_C(const uint8_t* WEBP_RESTRICT a, const uint8_t* WEBP_RESTRICT r, const uint8_t* WEBP_RESTRICT g, const uint8_t* WEBP_RESTRICT b, int len, uint32_t* WEBP_RESTRICT out) { int i; for (i = 0; i < len; ++i) { out[i] = MakeARGB32(a[4 * i], r[4 * i], g[4 * i], b[4 * i]); } } #endif static void PackRGB_C(const uint8_t* WEBP_RESTRICT r, const uint8_t* WEBP_RESTRICT g, const uint8_t* WEBP_RESTRICT b, int len, int step, uint32_t* WEBP_RESTRICT out) { … } void (*WebPApplyAlphaMultiply)(uint8_t*, int, int, int, int); void (*WebPApplyAlphaMultiply4444)(uint8_t*, int, int, int); int (*WebPDispatchAlpha)(const uint8_t* WEBP_RESTRICT, int, int, int, uint8_t* WEBP_RESTRICT, int); void (*WebPDispatchAlphaToGreen)(const uint8_t* WEBP_RESTRICT, int, int, int, uint32_t* WEBP_RESTRICT, int); int (*WebPExtractAlpha)(const uint8_t* WEBP_RESTRICT, int, int, int, uint8_t* WEBP_RESTRICT, int); void (*WebPExtractGreen)(const uint32_t* WEBP_RESTRICT argb, uint8_t* WEBP_RESTRICT alpha, int size); #ifdef WORDS_BIGENDIAN void (*WebPPackARGB)(const uint8_t* a, const uint8_t* r, const uint8_t* g, const uint8_t* b, int, uint32_t*); #endif void (*WebPPackRGB)(const uint8_t* WEBP_RESTRICT r, const uint8_t* WEBP_RESTRICT g, const uint8_t* WEBP_RESTRICT b, int len, int step, uint32_t* WEBP_RESTRICT out); int (*WebPHasAlpha8b)(const uint8_t* src, int length); int (*WebPHasAlpha32b)(const uint8_t* src, int length); void (*WebPAlphaReplace)(uint32_t* src, int length, uint32_t color); //------------------------------------------------------------------------------ // Init function extern VP8CPUInfo VP8GetCPUInfo; extern void WebPInitAlphaProcessingMIPSdspR2(void); extern void WebPInitAlphaProcessingSSE2(void); extern void WebPInitAlphaProcessingSSE41(void); extern void WebPInitAlphaProcessingNEON(void); WEBP_DSP_INIT_FUNC(WebPInitAlphaProcessing) { … }
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