gif_square.h

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/*
 * Copyright 2014 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http:///www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */


#ifndef PAGESPEED_KERNEL_IMAGE_GIF_SQUARE_H_
#define PAGESPEED_KERNEL_IMAGE_GIF_SQUARE_H_

#include <cstddef>
#include <vector>

#include "pagespeed/kernel/base/string.h"
#include "pagespeed/kernel/image/image_util.h"

extern "C" {
#include "third_party/giflib/lib/gif_lib.h"
}

namespace net_instaweb {
class MessageHandler;
}

namespace pagespeed {
namespace image_compression {

class GifSquare {
 public:
  GifSquare(bool manual_gcb, net_instaweb::MessageHandler* handler);
  ~GifSquare();

  bool Open(const GoogleString& filename);

  bool PrepareScreen(bool gif89, size_px width, size_px height,
                     const GifColorType* color_map, int num_colors,
                     int bg_color_idx, size_t loop_count);

  bool PutImage(size_px left, size_px top, size_px width, size_px height,
                const GifColorType* colormap, int num_colors,
                int color_index, int transparent_idx,
                bool interlace, int delay_cs, int disposal_method);

  bool AnimateAllImages(int delay_cs, int transparent_idx,
                        int disposal_method);

  bool Close();

  static const size_t kNoLoopCountSpecified;
  static const GifColorType kGifWhite;
  static const GifColorType kGifBlack;
  static const GifColorType kGifGray;
  static const GifColorType kGifRed;
  static const GifColorType kGifGreen;
  static const GifColorType kGifBlue;
  static const GifColorType kGifYellow;

 private:
  bool manual_gcb_;
  net_instaweb::MessageHandler* handler_;
  bool success_;
  GifFileType* gif_file_;
  int num_images_;
  bool closed_;
  std::vector<ColorMapObject*> colormaps_;

  bool Log(bool success, const char* prefix);

  bool Fail(const char* prefix, const char* message);

  bool CanProceed() {
    return success_ && !closed_;
  }
};

}  
}  

#endif