Quelle  yuv_mips32.c   Sprache: C

// Copyright 2014 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.
// -----------------------------------------------------------------------------
//
// MIPS version of YUV to RGB upsampling functions.
//
// Author(s):  Djordje Pesut    (djordje.pesut@imgtec.com)
//             Jovan Zelincevic (jovan.zelincevic@imgtec.com)

#include "src/dsp/dsp.h"

#if defined(WEBP_USE_MIPS32)

#include "src/dsp/yuv.h"

//------------------------------------------------------------------------------
// simple point-sampling

#define ROW_FUNC(FUNC_NAME, XSTEP, R, G, B, A)                                 \
static void FUNC_NAME(const uint8_t* WEBP_RESTRICT y,                          \
                      const uint8_t* WEBP_RESTRICT u,                          \
                      const uint8_t* WEBP_RESTRICT v,                          \
                      uint8_t* WEBP_RESTRICT dst, int len) {                   \
  int i, r, g, b;                                                              \
  int temp0, temp1, temp2, temp3, temp4;                                       \
  for (i = 0; i < (len >> 1); i++) {                                           \
    temp1 = MultHi(v[0], 26149);                                               \
    temp3 = MultHi(v[0], 13320);                                               \
    temp2 = MultHi(u[0], 6419);                                                \
    temp4 = MultHi(u[0], 33050);                                               \
    temp0 = MultHi(y[0], 19077);                                               \
    temp1 -= 14234;                                                            \
    temp3 -= 8708;                                                             \
    temp2 += temp3;                                                            \
    temp4 -= 17685;                                                            \
    r = VP8Clip8(temp0 + temp1);                                               \
    g = VP8Clip8(temp0 - temp2);                                               \
    b = VP8Clip8(temp0 + temp4);                                               \
    temp0 = MultHi(y[1], 19077);                                               \
    dst[R] = r;                                                                \
    dst[G] = g;                                                                \
    dst[B] = b;                                                                \
    if (A) dst[A] = 0xff;                                                      \
    r = VP8Clip8(temp0 + temp1);                                               \
    g = VP8Clip8(temp0 - temp2);                                               \
    b = VP8Clip8(temp0 + temp4);                                               \
    dst[R + XSTEP] = r;                                                        \
    dst[G + XSTEP] = g;                                                        \
    dst[B + XSTEP] = b;                                                        \
    if (A) dst[A + XSTEP] = 0xff;                                              \
    y += 2;                                                                    \
    ++u;                                                                       \
    ++v;                                                                       \
    dst += 2 * XSTEP;                                                          \
  }                                                                            \
  if (len & 1) {                                                               \
    temp1 = MultHi(v[0], 26149);                                               \
    temp3 = MultHi(v[0], 13320);                                               \
    temp2 = MultHi(u[0], 6419);                                                \
    temp4 = MultHi(u[0], 33050);                                               \
    temp0 = MultHi(y[0], 19077);                                               \
    temp1 -= 14234;                                                            \
    temp3 -= 8708;                                                             \
    temp2 += temp3;                                                            \
    temp4 -= 17685;                                                            \
    r = VP8Clip8(temp0 + temp1);                                               \
    g = VP8Clip8(temp0 - temp2);                                               \
    b = VP8Clip8(temp0 + temp4);                                               \
    dst[R] = r;                                                                \
    dst[G] = g;                                                                \
    dst[B] = b;                                                                \
    if (A) dst[A] = 0xff;                                                      \
  }                                                                            \
}

ROW_FUNC(YuvToRgbRow_MIPS32,      3, 0, 1, 2, 0)
ROW_FUNC(YuvToRgbaRow_MIPS32,     4, 0, 1, 2, 3)
ROW_FUNC(YuvToBgrRow_MIPS32,      3, 2, 1, 0, 0)
ROW_FUNC(YuvToBgraRow_MIPS32,     4, 2, 1, 0, 3)

#undef ROW_FUNC

//------------------------------------------------------------------------------
// Entry point

extern void WebPInitSamplersMIPS32(void);

WEBP_TSAN_IGNORE_FUNCTION void WebPInitSamplersMIPS32(void) {
  WebPSamplers[MODE_RGB]  = YuvToRgbRow_MIPS32;
  WebPSamplers[MODE_RGBA] = YuvToRgbaRow_MIPS32;
  WebPSamplers[MODE_BGR]  = YuvToBgrRow_MIPS32;
  WebPSamplers[MODE_BGRA] = YuvToBgraRow_MIPS32;
}

#else  // !WEBP_USE_MIPS32

WEBP_DSP_INIT_STUB(WebPInitSamplersMIPS32)

#endif  // WEBP_USE_MIPS32