webkit/support/webkit_support_gfx.h

// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef WEBKIT_SUPPORT_WEBKIT_SUPPORT_GFX_H_
#define WEBKIT_SUPPORT_WEBKIT_SUPPORT_GFX_H_

#include <string>
#include <vector>

#include "ui/gfx/codec/png_codec.h"
#include "ui/gfx/size.h"

namespace webkit_support {

// Decode a PNG into an RGBA pixel array.
inline bool DecodePNG(const unsigned char* input, size_t input_size,
                      std::vector<unsigned char>* output,
                      int* width, int* height) {
  return gfx::PNGCodec::Decode(input, input_size, gfx::PNGCodec::FORMAT_RGBA,
                               output, width, height);
}

// Encode an RGBA pixel array into a PNG.
inline bool EncodeRGBAPNG(const unsigned char* input,
                          int width,
                          int height,
                          int row_byte_width,
                          std::vector<unsigned char>* output) {
  return gfx::PNGCodec::Encode(input, gfx::PNGCodec::FORMAT_RGBA,
      gfx::Size(width, height), row_byte_width, false,
      std::vector<gfx::PNGCodec::Comment>(), output);
}

// Encode an BGRA pixel array into a PNG.
inline bool EncodeBGRAPNG(const unsigned char* input,
                          int width,
                          int height,
                          int row_byte_width,
                          bool discard_transparency,
                          std::vector<unsigned char>* output) {
  return gfx::PNGCodec::Encode(input, gfx::PNGCodec::FORMAT_BGRA,
      gfx::Size(width, height), row_byte_width, discard_transparency,
      std::vector<gfx::PNGCodec::Comment>(), output);
}

inline bool EncodeBGRAPNGWithChecksum(const unsigned char* input,
                          int width,
                          int height,
                          int row_byte_width,
                          bool discard_transparency,
                          const std::string& checksum,
                          std::vector<unsigned char>* output) {
  std::vector<gfx::PNGCodec::Comment> comments;
  comments.push_back(gfx::PNGCodec::Comment("checksum", checksum));
  return gfx::PNGCodec::Encode(input, gfx::PNGCodec::FORMAT_BGRA,
      gfx::Size(width, height), row_byte_width, discard_transparency,
      comments, output);
}

}  // namespace webkit_support

#endif  // WEBKIT_SUPPORT_WEBKIT_SUPPORT_GFX_H_