// 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 (pascal.massimino@gmail.com)

#include <assert.h>

#include <stddef.h>

#include "src/dsp/cpu.h"

#include "src/dsp/dsp.h"

#include "src/webp/types.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 0  // ALTERNATE_CODE

#endif

// -----------------------------------------------------------------------------

#define MFIX 24  // 24bit fixed-point arithmetic

#define HALF ((1u << MFIX) >> 1)

#define KINV_255 ((1u << MFIX) / 255u)

static uint32_t Mult(uint8_t x, uint32_t mult) {

  const uint32_t v = (x * mult + HALF) >> MFIX;

  assert(v <= 255);  // <- 24bit precision is enough to ensure that.

  return v;

}

#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) {

  return inverse ? (255u << MFIX) / a : a * KINV_255;

}

#endif  // USE_TABLES_FOR_ALPHA_MULT

void WebPMultARGBRow_C(uint32_t* const ptr, int width, int inverse) {

  int x;

  for (x = 0; x < width; ++x) {

    const uint32_t argb = ptr[x];

    if (argb < 0xff000000u) {     // alpha < 255

      if (argb <= 0x00ffffffu) {  // alpha == 0

        ptr[x] = 0;

      } else {

        const uint32_t alpha = (argb >> 24) & 0xff;

        const uint32_t scale = GetScale(alpha, inverse);

        uint32_t out = argb & 0xff000000u;

        out |= Mult(argb >> 0, scale) << 0;

        out |= Mult(argb >> 8, scale) << 8;

        out |= Mult(argb >> 16, scale) << 16;

        ptr[x] = out;

      }

    }

  }

}

void WebPMultRow_C(uint8_t* WEBP_RESTRICT const ptr,

                   const uint8_t* WEBP_RESTRICT const alpha, int width,

                   int inverse) {

  int x;

  for (x = 0; x < width; ++x) {

    const uint32_t a = alpha[x];

    if (a != 255) {

      if (a == 0) {

        ptr[x] = 0;

      } else {

        const uint32_t scale = GetScale(a, inverse);

        ptr[x] = Mult(ptr[x], scale);

      }

    }

  }

}

#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) {

  int n;

  for (n = 0; n < num_rows; ++n) {

    WebPMultARGBRow((uint32_t*)ptr, width, inverse);

    ptr += stride;

  }

}

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) {

  int n;

  for (n = 0; n < num_rows; ++n) {

    WebPMultRow(ptr, alpha, width, inverse);

    ptr += stride;

    alpha += alpha_stride;

  }

}

//------------------------------------------------------------------------------

// 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(a) ((a) * 32897U)

#define PREMULTIPLY(x, m) (((x) * (m)) >> 23)

#else  // (int)(x * a / 255. + .5)

#define MULTIPLIER(a) ((a) * 65793U)

#define PREMULTIPLY(x, m) (((x) * (m) + (1U << 23)) >> 24)

#endif

#if !WEBP_NEON_OMIT_C_CODE

static void ApplyAlphaMultiply_C(uint8_t* rgba, int alpha_first, int w, int h,

                                 int stride) {

  while (h-- > 0) {

    uint8_t* const rgb = rgba + (alpha_first ? 1 : 0);

    const uint8_t* const alpha = rgba + (alpha_first ? 0 : 3);

    int i;

    for (i = 0; i < w; ++i) {

      const uint32_t a = alpha[4 * i];

      if (a != 0xff) {

        const uint32_t mult = MULTIPLIER(a);

        rgb[4 * i + 0] = PREMULTIPLY(rgb[4 * i + 0], mult);

        rgb[4 * i + 1] = PREMULTIPLY(rgb[4 * i + 1], mult);

        rgb[4 * i + 2] = PREMULTIPLY(rgb[4 * i + 2], mult);

      }

    }

    rgba += stride;

  }

}

#endif  // !WEBP_NEON_OMIT_C_CODE

#undef MULTIPLIER

#undef PREMULTIPLY

// rgbA4444

#define MULTIPLIER(a) ((a) * 0x1111)  // 0x1111 ~= (1 << 16) / 15

static WEBP_INLINE uint8_t dither_hi(uint8_t x) {

  return (x & 0xf0) | (x >> 4);

}

static WEBP_INLINE uint8_t dither_lo(uint8_t x) {

  return (x & 0x0f) | (x << 4);

}

static WEBP_INLINE uint8_t multiply(uint8_t x, uint32_t m) {

  return (x * m) >> 16;

}

static WEBP_INLINE void ApplyAlphaMultiply4444_C(uint8_t* rgba4444, int w,

                                                 int h, int stride,

                                                 int rg_byte_pos /* 0 or 1 */) {

  while (h-- > 0) {

    int i;

    for (i = 0; i < w; ++i) {

      const uint32_t rg = rgba4444[2 * i + rg_byte_pos];

      const uint32_t ba = rgba4444[2 * i + (rg_byte_pos ^ 1)];

      const uint8_t a = ba & 0x0f;

      const uint32_t mult = MULTIPLIER(a);

      const uint8_t r = multiply(dither_hi(rg), mult);

      const uint8_t g = multiply(dither_lo(rg), mult);

      const uint8_t b = multiply(dither_hi(ba), mult);

      rgba4444[2 * i + rg_byte_pos] = (r & 0xf0) | ((g >> 4) & 0x0f);

      rgba4444[2 * i + (rg_byte_pos ^ 1)] = (b & 0xf0) | a;

    }

    rgba4444 += stride;

  }

}

#undef MULTIPLIER

static void ApplyAlphaMultiply_16b_C(uint8_t* rgba4444, int w, int h,

                                     int stride) {

#if (WEBP_SWAP_16BIT_CSP == 1)

  ApplyAlphaMultiply4444_C(rgba4444, w, h, stride, 1);

#else

  ApplyAlphaMultiply4444_C(rgba4444, w, h, stride, 0);

#endif

}

#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) {

  uint32_t alpha_mask = 0xff;

  int i, j;

  for (j = 0; j < height; ++j) {

    for (i = 0; i < width; ++i) {

      const uint32_t alpha_value = alpha[i];

      dst[4 * i] = alpha_value;

      alpha_mask &= alpha_value;

    }

    alpha += alpha_stride;

    dst += dst_stride;

  }

  return (alpha_mask != 0xff);

}

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) {

  int i, j;

  for (j = 0; j < height; ++j) {

    for (i = 0; i < width; ++i) {

      dst[i] = alpha[i] << 8;  // leave A/R/B channels zero'd.

    }

    alpha += alpha_stride;

    dst += 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) {

  uint8_t alpha_mask = 0xff;

  int i, j;

  for (j = 0; j < height; ++j) {

    for (i = 0; i < width; ++i) {

      const uint8_t alpha_value = argb[4 * i];

      alpha[i] = alpha_value;

      alpha_mask &= alpha_value;

    }

    argb += argb_stride;

    alpha += alpha_stride;

  }

  return (alpha_mask == 0xff);

}

static void ExtractGreen_C(const uint32_t* WEBP_RESTRICT argb,

                           uint8_t* WEBP_RESTRICT alpha, int size) {

  int i;

  for (i = 0; i < size; ++i) alpha[i] = argb[i] >> 8;

}

#endif  // !WEBP_NEON_OMIT_C_CODE

//------------------------------------------------------------------------------

static int HasAlpha8b_C(const uint8_t* src, int length) {

  while (length-- > 0) {

    if (*src++ != 0xff) return 1;

  }

  return 0;

}

static int HasAlpha32b_C(const uint8_t* src, int length) {

  int x;

  for (x = 0; length-- > 0; x += 4) {

    if (src[x] != 0xff) return 1;

  }

  return 0;

}

static void AlphaReplace_C(uint32_t* src, int length, uint32_t color) {

  int x;

  for (x = 0; x < length; ++x) {

    if ((src[x] >> 24) == 0) src[x] = color;

  }

}

//------------------------------------------------------------------------------

// Simple channel manipulations.

static WEBP_INLINE uint32_t MakeARGB32(int a, int r, int g, int b) {

  return (((uint32_t)a << 24) | (r << 16) | (g << 8) | 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) {

  int i, offset = 0;

  for (i = 0; i < len; ++i) {

    out[i] = MakeARGB32(0xff, r[offset], g[offset], b[offset]);

    offset += step;

  }

}

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) {

  WebPMultARGBRow = WebPMultARGBRow_C;

  WebPMultRow = WebPMultRow_C;

  WebPApplyAlphaMultiply4444 = ApplyAlphaMultiply_16b_C;

#ifdef WORDS_BIGENDIAN

  WebPPackARGB = PackARGB_C;

#endif

  WebPPackRGB = PackRGB_C;

#if !WEBP_NEON_OMIT_C_CODE

  WebPApplyAlphaMultiply = ApplyAlphaMultiply_C;

  WebPDispatchAlpha = DispatchAlpha_C;

  WebPDispatchAlphaToGreen = DispatchAlphaToGreen_C;

  WebPExtractAlpha = ExtractAlpha_C;

  WebPExtractGreen = ExtractGreen_C;

#endif

  WebPHasAlpha8b = HasAlpha8b_C;

  WebPHasAlpha32b = HasAlpha32b_C;

  WebPAlphaReplace = AlphaReplace_C;

  // If defined, use CPUInfo() to overwrite some pointers with faster versions.

  if (VP8GetCPUInfo != NULL) {

#if defined(WEBP_HAVE_SSE2)

    if (VP8GetCPUInfo(kSSE2)) {

      WebPInitAlphaProcessingSSE2();

#if defined(WEBP_HAVE_SSE41)

      if (VP8GetCPUInfo(kSSE4_1)) {

        WebPInitAlphaProcessingSSE41();

      }

#endif

    }

#endif

#if defined(WEBP_USE_MIPS_DSP_R2)

    if (VP8GetCPUInfo(kMIPSdspR2)) {

      WebPInitAlphaProcessingMIPSdspR2();

    }

#endif

  }

#if defined(WEBP_HAVE_NEON)

  if (WEBP_NEON_OMIT_C_CODE ||

      (VP8GetCPUInfo != NULL && VP8GetCPUInfo(kNEON))) {

    WebPInitAlphaProcessingNEON();

  }

#endif

  assert(WebPMultARGBRow != NULL);

  assert(WebPMultRow != NULL);

  assert(WebPApplyAlphaMultiply != NULL);

  assert(WebPApplyAlphaMultiply4444 != NULL);

  assert(WebPDispatchAlpha != NULL);

  assert(WebPDispatchAlphaToGreen != NULL);

  assert(WebPExtractAlpha != NULL);

  assert(WebPExtractGreen != NULL);

#ifdef WORDS_BIGENDIAN

  assert(WebPPackARGB != NULL);

#endif

  assert(WebPPackRGB != NULL);

  assert(WebPHasAlpha8b != NULL);

  assert(WebPHasAlpha32b != NULL);

  assert(WebPAlphaReplace != NULL);

}