pixel_format_optimizer.h

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/*
 * Copyright 2013 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_PIXEL_FORMAT_OPTIMIZER_H_
#define PAGESPEED_KERNEL_IMAGE_PIXEL_FORMAT_OPTIMIZER_H_

#include <cstddef>
#include "pagespeed/kernel/base/basictypes.h"
#include "pagespeed/kernel/base/message_handler.h"
#include "pagespeed/kernel/base/scoped_ptr.h"
#include "pagespeed/kernel/image/image_util.h"
#include "pagespeed/kernel/image/scanline_interface.h"
#include "pagespeed/kernel/image/scanline_status.h"

namespace pagespeed {

namespace image_compression {
class PixelFormatOptimizer : public ScanlineReaderInterface {
 public:
  explicit PixelFormatOptimizer(net_instaweb::MessageHandler* handler);
  virtual ~PixelFormatOptimizer();

  ScanlineStatus Initialize(ScanlineReaderInterface* reader);

  virtual ScanlineStatus ReadNextScanlineWithStatus(void** out_scanline_bytes);

  virtual bool Reset();

  virtual size_t GetBytesPerScanline() {
    return bytes_per_row_;
  }

  virtual bool HasMoreScanLines() {
    return (output_row_ < GetImageHeight());
  }

  virtual size_t GetImageHeight() {
    return reader_->GetImageHeight();
  }

  virtual size_t GetImageWidth() {
    return reader_->GetImageWidth();
  }

  virtual PixelFormat GetPixelFormat() {
    return pixel_format_;
  }

  virtual bool IsProgressive() {
    return reader_->IsProgressive();
  }

  virtual ScanlineStatus InitializeWithStatus(const void* image_buffer,
                                              size_t buffer_length);

 private:
  net_instaweb::scoped_ptr<ScanlineReaderInterface> reader_;
  size_t bytes_per_row_;
  PixelFormat pixel_format_;
  size_t output_row_;
  bool strip_alpha_;
  bool was_initialized_;

  net_instaweb::scoped_array<uint8_t> input_lines_;

  size_t input_row_;

  net_instaweb::scoped_array<uint8_t> output_line_;

  net_instaweb::MessageHandler* message_handler_;

  
};

}  

}  

#endif