[WIP] Move ImageDecoders to SkCodec

third_party/WebKit/Source/platform/image-decoders/bmp/BMPImageDecoder.h

-/*
- * Copyright (c) 2008, 2009, Google Inc. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are
- * met:
- *
- *     * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *     * Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following disclaimer
- * in the documentation and/or other materials provided with the
- * distribution.
- *     * Neither the name of Google Inc. nor the names of its
- * contributors may be used to endorse or promote products derived from
- * this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#ifndef BMPImageDecoder_h
-#define BMPImageDecoder_h
-
-#include "platform/image-decoders/bmp/BMPImageReader.h"
-#include <memory>
-
-namespace blink {
-
-// This class decodes the BMP image format.
-class PLATFORM_EXPORT BMPImageDecoder final : public ImageDecoder {
- public:
-  BMPImageDecoder(AlphaOption, const ColorBehavior&, size_t max_decoded_bytes);
-
-  // ImageDecoder:
-  String FilenameExtension() const override { return "bmp"; }
-  void OnSetData(SegmentReader*) override;
-  // CAUTION: SetFailed() deletes |reader_|.  Be careful to avoid
-  // accessing deleted memory, especially when calling this from inside
-  // BMPImageReader!
-  bool SetFailed() override;
-
- private:
-  // ImageDecoder:
-  void DecodeSize() override { Decode(true); }
-  void Decode(size_t) override { Decode(false); }
-
-  // Decodes the image.  If |only_size| is true, stops decoding after
-  // calculating the image size. If decoding fails but there is no more
-  // data coming, sets the "decode failure" flag.
-  void Decode(bool only_size);
-
-  // Decodes the image.  If |only_size| is true, stops decoding after
-  // calculating the image size. Returns whether decoding succeeded.
-  bool DecodeHelper(bool only_size);
-
-  // Processes the file header at the beginning of the data.  Sets
-  // |img_data_offset| based on the header contents. Returns true if the
-  // file header could be decoded.
-  bool ProcessFileHeader(size_t& img_data_offset);
-
-  // An index into |data_| representing how much we've already decoded.
-  // Note that this only tracks data _this_ class decodes; once the
-  // BMPImageReader takes over this will not be updated further.
-  size_t decoded_offset_;
-
-  // The reader used to do most of the BMP decoding.
-  std::unique_ptr<BMPImageReader> reader_;
-};
-
-}  // namespace blink
-
-#endif