| /* |
| * 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: |
| * |
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| * 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 |
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| */ |
| |
| #ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_IMAGE_DECODERS_BMP_BMP_IMAGE_DECODER_H_ |
| #define THIRD_PARTY_BLINK_RENDERER_PLATFORM_IMAGE_DECODERS_BMP_BMP_IMAGE_DECODER_H_ |
| |
| #include <memory> |
| #include "third_party/blink/renderer/platform/image-decoders/image_decoder.h" |
| |
| namespace blink { |
| |
| class BMPImageReader; |
| class FastSharedBufferReader; |
| |
| // This class decodes the BMP image format. |
| class PLATFORM_EXPORT BMPImageDecoder final : public ImageDecoder { |
| public: |
| BMPImageDecoder(AlphaOption, const ColorBehavior&, size_t max_decoded_bytes); |
| |
| ~BMPImageDecoder() override; |
| |
| // 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); |
| |
| // Uses |fast_reader| and |buffer| to read the file header into |file_header|. |
| // Computes |file_type| from the file header. Returns whether there was |
| // sufficient data available to read the header. |
| bool GetFileType(const FastSharedBufferReader& fast_reader, |
| char* buffer, |
| const char*& file_header, |
| uint16_t& file_type) const; |
| |
| // 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 |