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Diffstat (limited to 'image/codecs/codec.h')
-rw-r--r-- | image/codecs/codec.h | 103 |
1 files changed, 103 insertions, 0 deletions
diff --git a/image/codecs/codec.h b/image/codecs/codec.h new file mode 100644 index 0000000000..d87758e65e --- /dev/null +++ b/image/codecs/codec.h @@ -0,0 +1,103 @@ +/* ScummVM - Graphic Adventure Engine + * + * ScummVM is the legal property of its developers, whose names + * are too numerous to list here. Please refer to the COPYRIGHT + * file distributed with this source distribution. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + * + */ + +#ifndef IMAGE_CODECS_CODEC_H +#define IMAGE_CODECS_CODEC_H + +#include "graphics/surface.h" +#include "graphics/pixelformat.h" + +namespace Common { +class SeekableReadStream; +} + +namespace Image { + +/** + * An abstract representation of a image codec. + * + * Unlike ImageDecoder, the entire info for a frame may not be present + * within the stream. The codec may rely on the supporting container + * for parameters and can also rely on a previous (or future) frame. + * When decoding, the previous frame may not destroyed and could be + * maintained for use in the next one. + * + * An ImageDecoder can always be a Codec, but a Codec may not necessarily + * be able to be an ImageDecoder. + * + * Used in image: + * - BitmapDecoder + * - PICTDecoder + * + * Used in video: + * - AVIDecoder + * - QuickTimeDecoder + * - VMDDecoder + */ +class Codec { +public: + Codec() {} + virtual ~Codec() {} + + /** + * Decode the frame for the given data and return a pointer to a surface + * containing the decoded frame. + * + * @return a pointer to the decoded frame + */ + virtual const Graphics::Surface *decodeFrame(Common::SeekableReadStream &stream) = 0; + + /** + * Get the format that the surface returned from decodeImage() will + * be in. + */ + virtual Graphics::PixelFormat getPixelFormat() const = 0; + + /** + * Can this codec's frames contain a palette? + */ + virtual bool containsPalette() const { return false; } + + /** + * Get the palette last decoded from decodeImage + */ + virtual const byte *getPalette() { return 0; } + + /** + * Does the codec have a dirty palette? + */ + virtual bool hasDirtyPalette() const { return false; } +}; + +/** + * Create a codec given a bitmap/AVI compression tag. + */ +Codec *createBitmapCodec(uint32 tag, int width, int height, int bitsPerPixel); + +/** + * Create a codec given a QuickTime compression tag. + */ +Codec *createQuickTimeCodec(uint32 tag, int width, int height, int bitsPerPixel); + +} // End of namespace Image + +#endif |