chromium/third_party/angle/src/image_util/loadimage_paletted.cpp

//
// Copyright 2022 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.
//

// loadimage_paletted.cpp: Decodes GL_PALETTE_* textures.

#include "image_util/loadimage.h"

#include <type_traits>
#include "common/mathutil.h"

#include "image_util/imageformats.h"

namespace angle
{

namespace
{

template <typename T>
R8G8B8A8 ReadColor(const T *src)
{ … }

size_t DecodeIndexIntoPalette(const uint8_t *row, size_t i, uint32_t indexBits)
{ … }

R8G8B8A8 DecodeColor(const uint8_t *src,
                     uint32_t redBlueBits,
                     uint32_t greenBits,
                     uint32_t alphaBits)
{ … }

}  // namespace

// See LoadPalettedToRGBA8.
void LoadPalettedToRGBA8Impl(const ImageLoadContext &context,
                             size_t width,
                             size_t height,
                             size_t depth,
                             uint32_t indexBits,
                             uint32_t redBlueBits,
                             uint32_t greenBits,
                             uint32_t alphaBits,
                             const uint8_t *input,
                             size_t inputRowPitch,
                             size_t inputDepthPitch,
                             uint8_t *output,
                             size_t outputRowPitch,
                             size_t outputDepthPitch)
{ … }

}  // namespace angle