kc3-lang/angle/src/image_util/loadimage.inc

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• Hash : 25390156
  Author :
  Date : 2025-08-21T00:13:19
  

  Suppress unsafe buffers on a file-by-file basis in src/ [1 of N]
  
  In this CL, we suppress many files but stop short of actually
  enabling the warning by not removing the line from the
  unsafe_buffers_paths.txt file. That will happen in a follow-on
  CL, along with resolving any stragglers missed here.
  
  This is mostly a manual change so as to familiarize myself with
  the kinds of issues faced by the Angle codebase when applying buffer
  safety warnings.
  
  -- Re-generate affected hashes.
  -- Clang-format applied to all changed files.
  -- Add a few missing .reserve() calls to vectors as noticed.
  -- Fix some mismatches between file names and header comments.
  -- Be more consistent with header comment format (blank lines and
     trailing //-only lines when a filename comment adjoins license
     boilerplate).
  
  Bug: b/436880895
  Change-Id: I3bde5cc2059acbe8345057289214f1a26f1c34aa
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/6869022
  Reviewed-by: Geoff Lang <geofflang@chromium.org>
  Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>
  Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>
  

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• src/image_util/loadimage.inc

• //
  // Copyright 2014 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
  
  #include "common/mathutil.h"
  
  #include <string.h>
  
  namespace angle
  {
  
  namespace priv
  {
  
  template <typename T>
  inline T *OffsetDataPointer(uint8_t *data, size_t y, size_t z, size_t rowPitch, size_t depthPitch)
  {
      return reinterpret_cast<T*>(data + (y * rowPitch) + (z * depthPitch));
  }
  
  template <typename T>
  inline const T *OffsetDataPointer(const uint8_t *data, size_t y, size_t z, size_t rowPitch, size_t depthPitch)
  {
      return reinterpret_cast<const T*>(data + (y * rowPitch) + (z * depthPitch));
  }
  
  }  // namespace priv
  
  template <typename type, size_t componentCount>
  inline void LoadToNative(const ImageLoadContext &context, size_t width, size_t height, size_t depth,
                           const uint8_t *input, size_t inputRowPitch, size_t inputDepthPitch,
                           uint8_t *output, size_t outputRowPitch, size_t outputDepthPitch)
  {
      const size_t rowSize = width * sizeof(type) * componentCount;
      const size_t layerSize = rowSize * height;
      const size_t imageSize = layerSize * depth;
  
      if (layerSize == inputDepthPitch && layerSize == outputDepthPitch)
      {
          ASSERT(rowSize == inputRowPitch && rowSize == outputRowPitch);
          memcpy(output, input, imageSize);
      }
      else if (rowSize == inputRowPitch && rowSize == outputRowPitch)
      {
          for (size_t z = 0; z < depth; z++)
          {
              const type *source = priv::OffsetDataPointer<type>(input, 0, z, inputRowPitch, inputDepthPitch);
              type *dest = priv::OffsetDataPointer<type>(output, 0, z, outputRowPitch, outputDepthPitch);
  
              memcpy(dest, source, layerSize);
          }
      }
      else
      {
          for (size_t z = 0; z < depth; z++)
          {
              for (size_t y = 0; y < height; y++)
              {
                  const type *source = priv::OffsetDataPointer<type>(input, y, z, inputRowPitch, inputDepthPitch);
                  type *dest = priv::OffsetDataPointer<type>(output, y, z, outputRowPitch, outputDepthPitch);
                  memcpy(dest, source, width * sizeof(type) * componentCount);
              }
          }
      }
  }
  
  template <typename type>
  inline void LoadToNative3To4Impl(const ImageLoadContext &context,
                                   const uint32_t fourthComponentBits,
                                   size_t width,
                                   size_t height,
                                   size_t depth,
                                   const uint8_t *input,
                                   size_t inputRowPitch,
                                   size_t inputDepthPitch,
                                   uint8_t *output,
                                   size_t outputRowPitch,
                                   size_t outputDepthPitch)
  {
      const type fourthValue = gl::bitCast<type>(fourthComponentBits);
  
      for (size_t z = 0; z < depth; z++)
      {
          for (size_t y = 0; y < height; y++)
          {
              const type *source =
                  priv::OffsetDataPointer<type>(input, y, z, inputRowPitch, inputDepthPitch);
              type *dest =
                  priv::OffsetDataPointer<type>(output, y, z, outputRowPitch, outputDepthPitch);
              for (size_t x = 0; x < width; x++)
              {
                  memcpy(&dest[x * 4], &source[x * 3], sizeof(type) * 3);
                  dest[x * 4 + 3] = fourthValue;
              }
          }
      }
  }
  
  template <typename type, uint32_t fourthComponentBits>
  inline void LoadToNative3To4(const ImageLoadContext &context,
                               size_t width,
                               size_t height,
                               size_t depth,
                               const uint8_t *input,
                               size_t inputRowPitch,
                               size_t inputDepthPitch,
                               uint8_t *output,
                               size_t outputRowPitch,
                               size_t outputDepthPitch)
  {
      LoadToNative3To4Impl<type>(context, fourthComponentBits, width, height, depth, input,
                                 inputRowPitch, inputDepthPitch, output, outputRowPitch,
                                 outputDepthPitch);
  }
  
  inline void LoadToNativeByte3To4Impl(const ImageLoadContext &context,
                                        const uint8_t fourthValue,
                                        size_t width,
                                        size_t height,
                                        size_t depth,
                                        const uint8_t *input,
                                        size_t inputRowPitch,
                                        size_t inputDepthPitch,
                                        uint8_t *output,
                                        size_t outputRowPitch,
                                        size_t outputDepthPitch)
  {
      // This function is used for both signed and unsigned byte copies.
      ASSERT(IsLittleEndian());
      uint32_t fourthValue32 = static_cast<uint32_t>(fourthValue) << 24;
  
      // To prevent undefined behavior, if the output address is not aligned by 4, the copy would be
      // done using the default function instead.
      if (reinterpret_cast<uintptr_t>(output) % 4 != 0)
      {
          LoadToNative3To4Impl<uint8_t>(context, fourthValue, width, height, depth, input,
                                        inputRowPitch, inputDepthPitch, output, outputRowPitch,
                                        outputDepthPitch);
          return;
      }
  
      for (size_t z = 0; z < depth; z++)
      {
          for (size_t y = 0; y < height; y++)
          {
              const uint8_t *source8 =
                  priv::OffsetDataPointer<uint8_t>(input, y, z, inputRowPitch, inputDepthPitch);
              uint8_t *dest8 =
                  priv::OffsetDataPointer<uint8_t>(output, y, z, outputRowPitch, outputDepthPitch);
  
              // If the uint8_t addresses are not aligned to 4 bytes, there may be undefined behavior
              // if they are used to copy 32-bit data. In that case, pixels are copied to the output
              // one at a time until 4-byte alignment has been achieved for the source.
              size_t pixelIndex = 0;
  
              uint32_t source4Mod = reinterpret_cast<uintptr_t>(source8) % 4;
              while (source4Mod != 0 && pixelIndex < width)
              {
                  dest8[0] = source8[0];
                  dest8[1] = source8[1];
                  dest8[2] = source8[2];
                  dest8[3] = fourthValue;
  
                  source8 += 3;
                  source4Mod = (source4Mod + 3) % 4;
                  dest8 += 4;
                  pixelIndex++;
              }
  
              if (pixelIndex == width)
              {
                  continue;
              }
  
              // In the following loop, 4 RGB pixels will be read in each iteration. If the remaining
              // pixels are not a multiple of 4, the rest at the end of the row will be copied one at
              // a time.
              const uint32_t *source32 = reinterpret_cast<const uint32_t *>(source8);
              uint32_t *dest32         = reinterpret_cast<uint32_t *>(dest8);
  
              size_t remainingWidth = width - pixelIndex;
              if (remainingWidth >= 4)
              {
                  size_t fourByteCopyThreshold = remainingWidth - 4;
                  for (; pixelIndex <= fourByteCopyThreshold; pixelIndex += 4)
                  {
                      // Three 32-bit values from the input contain 4 RGB pixels in total. This
                      // translates to four 32-bits on the output.
                      // (RGBR GBRG BRGB -> RGBA RGBA RGBA RGBA)
                      uint32_t newPixelData[3];
                      uint32_t rgbaPixelData[4];
                      memcpy(&newPixelData[0], &source32[0], sizeof(uint32_t) * 3);
  
                      rgbaPixelData[0] = (newPixelData[0] & 0x00FFFFFF) | fourthValue32;
                      rgbaPixelData[1] = (newPixelData[0] >> 24) |
                                         ((newPixelData[1] & 0x0000FFFF) << 8) | fourthValue32;
                      rgbaPixelData[2] = (newPixelData[1] >> 16) |
                                         ((newPixelData[2] & 0x000000FF) << 16) | fourthValue32;
                      rgbaPixelData[3] = (newPixelData[2] >> 8) | fourthValue32;
  
                      memcpy(&dest32[0], &rgbaPixelData[0], sizeof(uint32_t) * 4);
  
                      source32 += 3;
                      dest32 += 4;
                  }
              }
  
              // We should copy the remaining pixels at the end one by one.
              source8 = reinterpret_cast<const uint8_t *>(source32);
              dest8   = reinterpret_cast<uint8_t *>(dest32);
              for (; pixelIndex < width; pixelIndex++)
              {
                  dest8[0] = source8[0];
                  dest8[1] = source8[1];
                  dest8[2] = source8[2];
                  dest8[3] = fourthValue;
  
                  source8 += 3;
                  dest8 += 4;
              }
          }
      }
  }
  
  template <>
  inline void LoadToNative3To4<uint8_t, 0xFF>(const ImageLoadContext &context,
                                              size_t width,
                                              size_t height,
                                              size_t depth,
                                              const uint8_t *input,
                                              size_t inputRowPitch,
                                              size_t inputDepthPitch,
                                              uint8_t *output,
                                              size_t outputRowPitch,
                                              size_t outputDepthPitch)
  {
      LoadToNativeByte3To4Impl(context, 0xFF, width, height, depth, input, inputRowPitch,
                                inputDepthPitch, output, outputRowPitch, outputDepthPitch);
  }
  
  template <>
  inline void LoadToNative3To4<uint8_t, 0x01>(const ImageLoadContext &context,
                                              size_t width,
                                              size_t height,
                                              size_t depth,
                                              const uint8_t *input,
                                              size_t inputRowPitch,
                                              size_t inputDepthPitch,
                                              uint8_t *output,
                                              size_t outputRowPitch,
                                              size_t outputDepthPitch)
  {
      LoadToNativeByte3To4Impl(context, 0x01, width, height, depth, input, inputRowPitch,
                                inputDepthPitch, output, outputRowPitch, outputDepthPitch);
  }
  
  template <>
  inline void LoadToNative3To4<int8_t, 0x01>(const ImageLoadContext &context,
                                              size_t width,
                                              size_t height,
                                              size_t depth,
                                              const uint8_t *input,
                                              size_t inputRowPitch,
                                              size_t inputDepthPitch,
                                              uint8_t *output,
                                              size_t outputRowPitch,
                                              size_t outputDepthPitch)
  {
      LoadToNativeByte3To4Impl(context, 0x01, width, height, depth, input, inputRowPitch,
                                inputDepthPitch, output, outputRowPitch, outputDepthPitch);
  }
  
  template <>
  inline void LoadToNative3To4<int8_t, 0x7F>(const ImageLoadContext &context,
                                              size_t width,
                                              size_t height,
                                              size_t depth,
                                              const uint8_t *input,
                                              size_t inputRowPitch,
                                              size_t inputDepthPitch,
                                              uint8_t *output,
                                              size_t outputRowPitch,
                                              size_t outputDepthPitch)
  {
      LoadToNativeByte3To4Impl(context, 0x7F, width, height, depth, input, inputRowPitch,
                                inputDepthPitch, output, outputRowPitch, outputDepthPitch);
  }
  
  template <size_t componentCount>
  inline void Load32FTo16F(const ImageLoadContext &context, size_t width, size_t height, size_t depth,
                           const uint8_t *input, size_t inputRowPitch, size_t inputDepthPitch,
                           uint8_t *output, size_t outputRowPitch, size_t outputDepthPitch)
  {
      const size_t elementWidth = componentCount * width;
  
      for (size_t z = 0; z < depth; z++)
      {
          for (size_t y = 0; y < height; y++)
          {
              const float *source = priv::OffsetDataPointer<float>(input, y, z, inputRowPitch, inputDepthPitch);
              uint16_t *dest = priv::OffsetDataPointer<uint16_t>(output, y, z, outputRowPitch, outputDepthPitch);
  
              for (size_t x = 0; x < elementWidth; x++)
              {
                  dest[x] = gl::float32ToFloat16(source[x]);
              }
          }
      }
  }
  
  template <typename type,
            size_t inputComponentCount,
            size_t outputComponentCount,
            bool normalized>
  inline void LoadToFloat(const ImageLoadContext &context, size_t width, size_t height, size_t depth,
                           const uint8_t *input, size_t inputRowPitch, size_t inputDepthPitch,
                           uint8_t *output, size_t outputRowPitch, size_t outputDepthPitch) {
      typedef std::numeric_limits<type> NL;
  
      for (size_t z = 0; z < depth; z++)
      {
          for (size_t y = 0; y < height; y++)
          {
              const type *source_line = priv::OffsetDataPointer<type>(input, y, z, inputRowPitch, inputDepthPitch);
              float *dest_line = priv::OffsetDataPointer<float>(output, y, z, outputRowPitch, outputDepthPitch);
  
              for (size_t x = 0; x < width; x++)
              {
                  const type *source_pixel = source_line + x * inputComponentCount;
                  float *dest_pixel = dest_line + x * outputComponentCount;
  
                  for (size_t i = 0; i < inputComponentCount; i++)
                  {
                      float result = 0;
                      if (normalized)
                      {
                          if (NL::is_signed)
                          {
                              result = static_cast<float>(source_pixel[i]) / static_cast<float>(NL::max());
                              result = result >= -1.0f ? result : -1.0f;
                          }
                          else
                          {
                              result = static_cast<float>(source_pixel[i]) / static_cast<float>(NL::max());
                          }
                      }
                      else
                      {
                          result = static_cast<float>(source_pixel[i]);
                      }
                      dest_pixel[i] = result;
                  }
  
                  for (size_t j = inputComponentCount; j < outputComponentCount; j++)
                  {
                      dest_pixel[j] = j == 3 ? 1.0f : 0.0f;
                  }
              }
          }
      }
  }
  
  template <size_t blockWidth, size_t blockHeight, size_t blockDepth, size_t blockSize>
  inline void LoadCompressedToNative(const ImageLoadContext &context, size_t width, size_t height,
                                     size_t depth, const uint8_t *input, size_t inputRowPitch,
                                     size_t inputDepthPitch, uint8_t *output, size_t outputRowPitch,
                                     size_t outputDepthPitch)
  {
      const size_t columns = (width + (blockWidth - 1)) / blockWidth;
      const size_t rows = (height + (blockHeight - 1)) / blockHeight;
      const size_t layers = (depth + (blockDepth - 1)) / blockDepth;
  
      const size_t inputLayerSize = inputRowPitch * rows;
      const size_t inputImageSize = inputDepthPitch * layers;
  
      const size_t outputLayerSize = outputRowPitch * rows;
      const size_t outputImageSize = outputDepthPitch * layers;
  
      if (inputImageSize == outputImageSize)
      {
          ASSERT(inputRowPitch == outputRowPitch);
          ASSERT(inputLayerSize == outputLayerSize && inputLayerSize == inputDepthPitch && outputLayerSize == outputDepthPitch);
          memcpy(output, input, inputImageSize);
      }
      else
      {
          // Note: this path should technically never be hit, but it is with the d3d backend.  Once
          // the issue is fixed, this path should be removed.
          // http://anglebug.com/42266773
          for (size_t z = 0; z < layers; ++z)
          {
              for (size_t y = 0; y < rows; ++y)
              {
                  const uint8_t *source = priv::OffsetDataPointer<uint8_t>(input, y, z, inputRowPitch, inputDepthPitch);
                  uint8_t *dest = priv::OffsetDataPointer<uint8_t>(output, y, z, outputRowPitch, outputDepthPitch);
                  memcpy(dest, source, columns * blockSize);
              }
          }
      }
  }
  
  template <typename type, uint32_t firstBits, uint32_t secondBits, uint32_t thirdBits, uint32_t fourthBits>
  inline void Initialize4ComponentData(size_t width, size_t height, size_t depth,
                                       uint8_t *output, size_t outputRowPitch, size_t outputDepthPitch)
  {
      type writeValues[4] =
      {
          gl::bitCast<type>(firstBits),
          gl::bitCast<type>(secondBits),
          gl::bitCast<type>(thirdBits),
          gl::bitCast<type>(fourthBits),
      };
  
      for (size_t z = 0; z < depth; z++)
      {
          for (size_t y = 0; y < height; y++)
          {
              type *destRow = priv::OffsetDataPointer<type>(output, y, z, outputRowPitch, outputDepthPitch);
              for (size_t x = 0; x < width; x++)
              {
                  type* destPixel = destRow + x * 4;
  
                  // This could potentially be optimized by generating an entire row of initialization
                  // data and copying row by row instead of pixel by pixel.
                  memcpy(destPixel, writeValues, sizeof(type) * 4);
              }
          }
      }
  }
  
  template <size_t blockWidth, size_t blockHeight>
  inline void LoadASTCToRGBA8(const ImageLoadContext &context,
                              size_t width,
                              size_t height,
                              size_t depth,
                              const uint8_t *input,
                              size_t inputRowPitch,
                              size_t inputDepthPitch,
                              uint8_t *output,
                              size_t outputRowPitch,
                              size_t outputDepthPitch)
  {
      LoadASTCToRGBA8Inner(context, width, height, depth, blockWidth, blockHeight, input, inputRowPitch,
                           inputDepthPitch, output, outputRowPitch, outputDepthPitch);
  }
  
  template <uint32_t indexBits, uint32_t redBlueBits, uint32_t greenBits, uint32_t alphaBits>
  inline void LoadPalettedToRGBA8(const ImageLoadContext &context,
                                  size_t width,
                                  size_t height,
                                  size_t depth,
                                  const uint8_t *input,
                                  size_t inputRowPitch,
                                  size_t inputDepthPitch,
                                  uint8_t *output,
                                  size_t outputRowPitch,
                                  size_t outputDepthPitch)
  {
      static_assert(indexBits == 4 || indexBits == 8);
      static_assert(redBlueBits == 4 || redBlueBits == 5 || redBlueBits == 8);
      static_assert(greenBits == 4 || greenBits == 5 || greenBits == 6 || greenBits == 8);
      static_assert(alphaBits == 0 || alphaBits == 1 || alphaBits == 4 || alphaBits == 8);
      constexpr uint32_t colorBits = 2 * redBlueBits + greenBits + alphaBits;
      static_assert(colorBits == 16 || colorBits == 24 || colorBits == 32);
  
      LoadPalettedToRGBA8Impl(context, width, height, depth,
                              indexBits, redBlueBits, greenBits, alphaBits,
                              input, inputRowPitch, inputDepthPitch,
                              output, outputRowPitch, outputDepthPitch);
  }
  
  // Temporary overload functions; need to have no-context overloads of the following functions used
  // by Chromium.  A Chromium change will switch to the with-context overloads, and then these can be
  // removed.
  inline void LoadEACR11ToR8(size_t width,
                             size_t height,
                             size_t depth,
                             const uint8_t *input,
                             size_t inputRowPitch,
                             size_t inputDepthPitch,
                             uint8_t *output,
                             size_t outputRowPitch,
                             size_t outputDepthPitch)
  {
      LoadEACR11ToR8({}, width, height, depth, input, inputRowPitch, inputDepthPitch, output,
                     outputRowPitch, outputDepthPitch);
  }
  
  inline void LoadEACR11SToR8(size_t width,
                              size_t height,
                              size_t depth,
                              const uint8_t *input,
                              size_t inputRowPitch,
                              size_t inputDepthPitch,
                              uint8_t *output,
                              size_t outputRowPitch,
                              size_t outputDepthPitch)
  {
      LoadEACR11SToR8({}, width, height, depth, input, inputRowPitch, inputDepthPitch, output,
                      outputRowPitch, outputDepthPitch);
  }
  
  inline void LoadEACRG11ToRG8(size_t width,
                               size_t height,
                               size_t depth,
                               const uint8_t *input,
                               size_t inputRowPitch,
                               size_t inputDepthPitch,
                               uint8_t *output,
                               size_t outputRowPitch,
                               size_t outputDepthPitch)
  {
      LoadEACRG11ToRG8({}, width, height, depth, input, inputRowPitch, inputDepthPitch, output,
                       outputRowPitch, outputDepthPitch);
  }
  
  inline void LoadEACRG11SToRG8(size_t width,
                                size_t height,
                                size_t depth,
                                const uint8_t *input,
                                size_t inputRowPitch,
                                size_t inputDepthPitch,
                                uint8_t *output,
                                size_t outputRowPitch,
                                size_t outputDepthPitch)
  {
      LoadEACRG11SToRG8({}, width, height, depth, input, inputRowPitch, inputDepthPitch, output,
                        outputRowPitch, outputDepthPitch);
  }
  
  inline void LoadETC2RGB8ToRGBA8(size_t width,
                                  size_t height,
                                  size_t depth,
                                  const uint8_t *input,
                                  size_t inputRowPitch,
                                  size_t inputDepthPitch,
                                  uint8_t *output,
                                  size_t outputRowPitch,
                                  size_t outputDepthPitch)
  {
      LoadETC2RGB8ToRGBA8({}, width, height, depth, input, inputRowPitch, inputDepthPitch, output,
                          outputRowPitch, outputDepthPitch);
  }
  
  inline void LoadETC2SRGB8ToRGBA8(size_t width,
                                   size_t height,
                                   size_t depth,
                                   const uint8_t *input,
                                   size_t inputRowPitch,
                                   size_t inputDepthPitch,
                                   uint8_t *output,
                                   size_t outputRowPitch,
                                   size_t outputDepthPitch)
  {
      LoadETC2SRGB8ToRGBA8({}, width, height, depth, input, inputRowPitch, inputDepthPitch, output,
                           outputRowPitch, outputDepthPitch);
  }
  
  inline void LoadETC2RGBA8ToRGBA8(size_t width,
                                   size_t height,
                                   size_t depth,
                                   const uint8_t *input,
                                   size_t inputRowPitch,
                                   size_t inputDepthPitch,
                                   uint8_t *output,
                                   size_t outputRowPitch,
                                   size_t outputDepthPitch)
  {
      LoadETC2RGBA8ToRGBA8({}, width, height, depth, input, inputRowPitch, inputDepthPitch, output,
                           outputRowPitch, outputDepthPitch);
  }
  
  inline void LoadETC2RGB8A1ToRGBA8(size_t width,
                                    size_t height,
                                    size_t depth,
                                    const uint8_t *input,
                                    size_t inputRowPitch,
                                    size_t inputDepthPitch,
                                    uint8_t *output,
                                    size_t outputRowPitch,
                                    size_t outputDepthPitch)
  {
      LoadETC2RGB8A1ToRGBA8({}, width, height, depth, input, inputRowPitch, inputDepthPitch, output,
                            outputRowPitch, outputDepthPitch);
  }
  
  inline void LoadETC2SRGBA8ToSRGBA8(size_t width,
                                     size_t height,
                                     size_t depth,
                                     const uint8_t *input,
                                     size_t inputRowPitch,
                                     size_t inputDepthPitch,
                                     uint8_t *output,
                                     size_t outputRowPitch,
                                     size_t outputDepthPitch)
  {
      LoadETC2SRGBA8ToSRGBA8({}, width, height, depth, input, inputRowPitch, inputDepthPitch, output,
                             outputRowPitch, outputDepthPitch);
  }
  
  inline void LoadETC2SRGB8A1ToRGBA8(size_t width,
                                     size_t height,
                                     size_t depth,
                                     const uint8_t *input,
                                     size_t inputRowPitch,
                                     size_t inputDepthPitch,
                                     uint8_t *output,
                                     size_t outputRowPitch,
                                     size_t outputDepthPitch)
  {
      LoadETC2SRGB8A1ToRGBA8({}, width, height, depth, input, inputRowPitch, inputDepthPitch, output,
                             outputRowPitch, outputDepthPitch);
  }
  
  } // namespace angle
  

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