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

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• Hash : 985d4293
  Author :
  Date : 2022-04-08T11:47:34
  

  Metal:Speed up BGRA8 to RGBA8 copy for readPixels
  
  On a 2048x2048 texture on Intel this goes from 26-27ms to 17-18ms
  
  Bug: angleproject:7117
  Change-Id: I4f48521b64e54669d180f0d2d8fdda78f83f89b5
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3579510
  Reviewed-by: Jamie Madill <jmadill@chromium.org>
  Reviewed-by: Kenneth Russell <kbr@chromium.org>
  Commit-Queue: Gregg Tavares <gman@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.
  //
  
  // 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++);
          }
      }
  }
  }  // 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;
          }
      }
  }
  
  }  // namespace angle
  

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