kc3-lang/angle/src/image_util/copyimage.cpp

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• Hash : 7619f8a0
  Author :
  Date : 2025-06-11T00:44:36
  

  Fast copy R8G8B8A8_UNORM / R8G8B8A8_UNORM_SRGB for readPixels
  
  Support FastCopyFunction on R8G8B8A8_UNORM and R8G8B8A8_UNORM_SRGB.
  Copying src pixels to dest directly is more performant than converting
  UNORM to GLfloat.
  
  Bug: b/429541195
  Tests: dEQP-GLES31.functional.srgb_texture_decode.skip_decode*
  Change-Id: If9a3d75dbf7b9fd286a61b144ed607144c833740
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/6704713
  Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>
  Reviewed-by: Geoff Lang <geofflang@chromium.org>
  Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>
  

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• src/image_util/copyimage.cpp

• //
  // Copyright 2013 The ANGLE Project Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  //
  
  #ifdef UNSAFE_BUFFERS_BUILD
  #    pragma allow_unsafe_buffers
  #endif
  
  // copyimage.cpp: Defines image copying functions
  
  #include "image_util/copyimage.h"
  
  namespace angle
  {
  
  namespace
  {
  inline uint32_t SwizzleBGRAToRGBA(uint32_t argb)
  {
      return ((argb & 0x000000FF) << 16) |  // Move BGRA blue to RGBA blue
             ((argb & 0x00FF0000) >> 16) |  // Move BGRA red to RGBA red
             ((argb & 0xFF00FF00));         // Keep alpha and green
  }
  
  void CopyBGRA8ToRGBA8Fast(const uint8_t *source,
                            int srcYAxisPitch,
                            uint8_t *dest,
                            int destYAxisPitch,
                            int destWidth,
                            int destHeight)
  {
      for (int y = 0; y < destHeight; ++y)
      {
          const uint32_t *src32 = reinterpret_cast<const uint32_t *>(source + y * srcYAxisPitch);
          uint32_t *dest32      = reinterpret_cast<uint32_t *>(dest + y * destYAxisPitch);
          const uint32_t *end32 = src32 + destWidth;
          while (src32 != end32)
          {
              *dest32++ = SwizzleBGRAToRGBA(*src32++);
          }
      }
  }
  
  void CopyRGBA8ToRGBA8Fast(const uint8_t *source,
                            int srcYAxisPitch,
                            uint8_t *dest,
                            int destYAxisPitch,
                            int destWidth,
                            int destHeight)
  {
      // If Y axis pitch is packed and the source is also packed and stored contiguously, copy the
      // whole source to the dest in a single memcpy operation.
      if (destYAxisPitch == destWidth * 4 && srcYAxisPitch == destWidth * 4)
      {
          size_t totalSize = destHeight * destWidth * 4;
          memcpy(dest, source, totalSize);
          return;
      }
  
      // If X axis pitch is 4 bytes but Y axis pitch is not packed, copy the source to dest line by
      // line.
      for (int y = 0; y < destHeight; ++y)
      {
          const uint8_t *src = source + y * srcYAxisPitch;
          uint8_t *dst       = dest + y * destYAxisPitch;
          memcpy(dst, src, destWidth * 4);
      }
  }
  }  // namespace
  
  void CopyBGRA8ToRGBA8(const uint8_t *source,
                        int srcXAxisPitch,
                        int srcYAxisPitch,
                        uint8_t *dest,
                        int destXAxisPitch,
                        int destYAxisPitch,
                        int destWidth,
                        int destHeight)
  {
      if (srcXAxisPitch == 4 && destXAxisPitch == 4)
      {
          CopyBGRA8ToRGBA8Fast(source, srcYAxisPitch, dest, destYAxisPitch, destWidth, destHeight);
          return;
      }
  
      for (int y = 0; y < destHeight; ++y)
      {
          uint8_t *dst       = dest + y * destYAxisPitch;
          const uint8_t *src = source + y * srcYAxisPitch;
          const uint8_t *end = src + destWidth * srcXAxisPitch;
  
          while (src != end)
          {
              *reinterpret_cast<uint32_t *>(dst) =
                  SwizzleBGRAToRGBA(*reinterpret_cast<const uint32_t *>(src));
              src += srcXAxisPitch;
              dst += destXAxisPitch;
          }
      }
  }
  
  void CopyRGBA8ToRGBA8(const uint8_t *source,
                        int srcXAxisPitch,
                        int srcYAxisPitch,
                        uint8_t *dest,
                        int destXAxisPitch,
                        int destYAxisPitch,
                        int destWidth,
                        int destHeight)
  {
      if (srcXAxisPitch == 4 && destXAxisPitch == 4)
      {
          CopyRGBA8ToRGBA8Fast(source, srcYAxisPitch, dest, destYAxisPitch, destWidth, destHeight);
          return;
      }
  
      for (int y = 0; y < destHeight; ++y)
      {
          uint8_t *dst       = dest + y * destYAxisPitch;
          const uint8_t *src = source + y * srcYAxisPitch;
          const uint8_t *end = src + destWidth * srcXAxisPitch;
  
          while (src != end)
          {
              *reinterpret_cast<uint32_t *>(dst) = *reinterpret_cast<const uint32_t *>(src);
              src += srcXAxisPitch;
              dst += destXAxisPitch;
          }
      }
  }
  
  }  // namespace angle
  

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