// Copyright 2010 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.

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

//

// YUV->RGB conversion functions

//

// Author: Skal (pascal.massimino@gmail.com)

#include "src/dsp/yuv.h"

#include <assert.h>

#include <stdlib.h>

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

// Plain-C version

#define ROW_FUNC(FUNC_NAME, FUNC, XSTEP)                                       \

static void FUNC_NAME(const uint8_t* y,                                        \

                      const uint8_t* u, const uint8_t* v,                      \

                      uint8_t* dst, int len) {                                 \

  const uint8_t* const end = dst + (len & ~1) * (XSTEP);                       \

  while (dst != end) {                                                         \

    FUNC(y[0], u[0], v[0], dst);                                               \

    FUNC(y[1], u[0], v[0], dst + (XSTEP));                                     \

    y += 2;                                                                    \

    ++u;                                                                       \

    ++v;                                                                       \

    dst += 2 * (XSTEP);                                                        \

  }                                                                            \

  if (len & 1) {                                                               \

    FUNC(y[0], u[0], v[0], dst);                                               \

  }                                                                            \

}                                                                              \

Unexecuted instantiation: yuv.c:YuvToRgbRow

Unexecuted instantiation: yuv.c:YuvToRgbaRow

Unexecuted instantiation: yuv.c:YuvToBgrRow

Unexecuted instantiation: yuv.c:YuvToBgraRow

Unexecuted instantiation: yuv.c:YuvToArgbRow

Unexecuted instantiation: yuv.c:YuvToRgba4444Row

Unexecuted instantiation: yuv.c:YuvToRgb565Row

// All variants implemented.

ROW_FUNC(YuvToRgbRow,      VP8YuvToRgb,  3)

ROW_FUNC(YuvToBgrRow,      VP8YuvToBgr,  3)

ROW_FUNC(YuvToRgbaRow,     VP8YuvToRgba, 4)

ROW_FUNC(YuvToBgraRow,     VP8YuvToBgra, 4)

ROW_FUNC(YuvToArgbRow,     VP8YuvToArgb, 4)

ROW_FUNC(YuvToRgba4444Row, VP8YuvToRgba4444, 2)

ROW_FUNC(YuvToRgb565Row,   VP8YuvToRgb565, 2)

#undef ROW_FUNC

// Main call for processing a plane with a WebPSamplerRowFunc function:

void WebPSamplerProcessPlane(const uint8_t* y, int y_stride,

                             const uint8_t* u, const uint8_t* v, int uv_stride,

                             uint8_t* dst, int dst_stride,

                             int width, int height, WebPSamplerRowFunc func) {

  int j;

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

    func(y, u, v, dst, width);

    y += y_stride;

    if (j & 1) {

      u += uv_stride;

      v += uv_stride;

    }

    dst += dst_stride;

  }

}

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

// Main call

WebPSamplerRowFunc WebPSamplers[MODE_LAST];

extern VP8CPUInfo VP8GetCPUInfo;

extern void WebPInitSamplersSSE2(void);

extern void WebPInitSamplersSSE41(void);

extern void WebPInitSamplersMIPS32(void);

extern void WebPInitSamplersMIPSdspR2(void);

WEBP_DSP_INIT_FUNC(WebPInitSamplers) {

  WebPSamplers[MODE_RGB]       = YuvToRgbRow;

  WebPSamplers[MODE_RGBA]      = YuvToRgbaRow;

  WebPSamplers[MODE_BGR]       = YuvToBgrRow;

  WebPSamplers[MODE_BGRA]      = YuvToBgraRow;

  WebPSamplers[MODE_ARGB]      = YuvToArgbRow;

  WebPSamplers[MODE_RGBA_4444] = YuvToRgba4444Row;

  WebPSamplers[MODE_RGB_565]   = YuvToRgb565Row;

  WebPSamplers[MODE_rgbA]      = YuvToRgbaRow;

  WebPSamplers[MODE_bgrA]      = YuvToBgraRow;

  WebPSamplers[MODE_Argb]      = YuvToArgbRow;

  WebPSamplers[MODE_rgbA_4444] = YuvToRgba4444Row;

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

  if (VP8GetCPUInfo != NULL) {

#if defined(WEBP_HAVE_SSE2)

    if (VP8GetCPUInfo(kSSE2)) {

      WebPInitSamplersSSE2();

    }

#endif  // WEBP_HAVE_SSE2

#if defined(WEBP_HAVE_SSE41)

    if (VP8GetCPUInfo(kSSE4_1)) {

      WebPInitSamplersSSE41();

    }

#endif  // WEBP_HAVE_SSE41

#if defined(WEBP_USE_MIPS32)

    if (VP8GetCPUInfo(kMIPS32)) {

      WebPInitSamplersMIPS32();

    }

#endif  // WEBP_USE_MIPS32

#if defined(WEBP_USE_MIPS_DSP_R2)

    if (VP8GetCPUInfo(kMIPSdspR2)) {

      WebPInitSamplersMIPSdspR2();

    }

#endif  // WEBP_USE_MIPS_DSP_R2

  }

}

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

// ARGB -> YUV converters

static void ConvertARGBToY_C(const uint32_t* argb, uint8_t* y, int width) {

  int i;

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

    const uint32_t p = argb[i];

    y[i] = VP8RGBToY((p >> 16) & 0xff, (p >> 8) & 0xff, (p >>  0) & 0xff,

                     YUV_HALF);

  }

}

void WebPConvertARGBToUV_C(const uint32_t* argb, uint8_t* u, uint8_t* v,

                           int src_width, int do_store) {

  // No rounding. Last pixel is dealt with separately.

  const int uv_width = src_width >> 1;

  int i;

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

    const uint32_t v0 = argb[2 * i + 0];

    const uint32_t v1 = argb[2 * i + 1];

    // VP8RGBToU/V expects four accumulated pixels. Hence we need to

    // scale r/g/b value by a factor 2. We just shift v0/v1 one bit less.

    const int r = ((v0 >> 15) & 0x1fe) + ((v1 >> 15) & 0x1fe);

    const int g = ((v0 >>  7) & 0x1fe) + ((v1 >>  7) & 0x1fe);

    const int b = ((v0 <<  1) & 0x1fe) + ((v1 <<  1) & 0x1fe);

    const int tmp_u = VP8RGBToU(r, g, b, YUV_HALF << 2);

    const int tmp_v = VP8RGBToV(r, g, b, YUV_HALF << 2);

    if (do_store) {

      u[i] = tmp_u;

      v[i] = tmp_v;

    } else {

      // Approximated average-of-four. But it's an acceptable diff.

      u[i] = (u[i] + tmp_u + 1) >> 1;

      v[i] = (v[i] + tmp_v + 1) >> 1;

    }

  }

  if (src_width & 1) {       // last pixel

    const uint32_t v0 = argb[2 * i + 0];

    const int r = (v0 >> 14) & 0x3fc;

    const int g = (v0 >>  6) & 0x3fc;

    const int b = (v0 <<  2) & 0x3fc;

    const int tmp_u = VP8RGBToU(r, g, b, YUV_HALF << 2);

    const int tmp_v = VP8RGBToV(r, g, b, YUV_HALF << 2);

    if (do_store) {

      u[i] = tmp_u;

      v[i] = tmp_v;

    } else {

      u[i] = (u[i] + tmp_u + 1) >> 1;

      v[i] = (v[i] + tmp_v + 1) >> 1;

    }

  }

}

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

static void ConvertRGB24ToY_C(const uint8_t* rgb, uint8_t* y, int width) {

  int i;

  for (i = 0; i < width; ++i, rgb += 3) {

    y[i] = VP8RGBToY(rgb[0], rgb[1], rgb[2], YUV_HALF);

  }

}

static void ConvertBGR24ToY_C(const uint8_t* bgr, uint8_t* y, int width) {

  int i;

  for (i = 0; i < width; ++i, bgr += 3) {

    y[i] = VP8RGBToY(bgr[2], bgr[1], bgr[0], YUV_HALF);

  }

}

void WebPConvertRGBA32ToUV_C(const uint16_t* rgb,

                             uint8_t* u, uint8_t* v, int width) {

  int i;

  for (i = 0; i < width; i += 1, rgb += 4) {

    const int r = rgb[0], g = rgb[1], b = rgb[2];

    u[i] = VP8RGBToU(r, g, b, YUV_HALF << 2);

    v[i] = VP8RGBToV(r, g, b, YUV_HALF << 2);

  }

}

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

void (*WebPConvertRGB24ToY)(const uint8_t* rgb, uint8_t* y, int width);

void (*WebPConvertBGR24ToY)(const uint8_t* bgr, uint8_t* y, int width);

void (*WebPConvertRGBA32ToUV)(const uint16_t* rgb,

                              uint8_t* u, uint8_t* v, int width);

void (*WebPConvertARGBToY)(const uint32_t* argb, uint8_t* y, int width);

void (*WebPConvertARGBToUV)(const uint32_t* argb, uint8_t* u, uint8_t* v,

                            int src_width, int do_store);

extern void WebPInitConvertARGBToYUVSSE2(void);

extern void WebPInitConvertARGBToYUVSSE41(void);

extern void WebPInitConvertARGBToYUVNEON(void);

WEBP_DSP_INIT_FUNC(WebPInitConvertARGBToYUV) {

  WebPConvertARGBToY = ConvertARGBToY_C;

  WebPConvertARGBToUV = WebPConvertARGBToUV_C;

  WebPConvertRGB24ToY = ConvertRGB24ToY_C;

  WebPConvertBGR24ToY = ConvertBGR24ToY_C;

  WebPConvertRGBA32ToUV = WebPConvertRGBA32ToUV_C;

  if (VP8GetCPUInfo != NULL) {

#if defined(WEBP_HAVE_SSE2)

    if (VP8GetCPUInfo(kSSE2)) {

      WebPInitConvertARGBToYUVSSE2();

    }

#endif  // WEBP_HAVE_SSE2

#if defined(WEBP_HAVE_SSE41)

    if (VP8GetCPUInfo(kSSE4_1)) {

      WebPInitConvertARGBToYUVSSE41();

    }

#endif  // WEBP_HAVE_SSE41

  }

#if defined(WEBP_HAVE_NEON)

  if (WEBP_NEON_OMIT_C_CODE ||

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

    WebPInitConvertARGBToYUVNEON();

  }

#endif  // WEBP_HAVE_NEON

  assert(WebPConvertARGBToY != NULL);

  assert(WebPConvertARGBToUV != NULL);

  assert(WebPConvertRGB24ToY != NULL);

  assert(WebPConvertBGR24ToY != NULL);

  assert(WebPConvertRGBA32ToUV != NULL);

}