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132 lines
3.4 KiB
C++
132 lines
3.4 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#ifndef IMAGE_CODECS_CODEC_H
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#define IMAGE_CODECS_CODEC_H
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#include "graphics/surface.h"
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#include "graphics/pixelformat.h"
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namespace Common {
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class SeekableReadStream;
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}
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namespace Image {
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/**
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* An abstract representation of a image codec.
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*
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* Unlike ImageDecoder, the entire info for a frame may not be present
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* within the stream. The codec may rely on the supporting container
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* for parameters and can also rely on a previous (or future) frame.
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* When decoding, the previous frame may not destroyed and could be
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* maintained for use in the next one.
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*
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* An ImageDecoder can always be a Codec, but a Codec may not necessarily
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* be able to be an ImageDecoder.
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*
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* Used in image:
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* - BitmapDecoder
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* - PICTDecoder
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*
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* Used in video:
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* - AVIDecoder
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* - QuickTimeDecoder
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* - VMDDecoder
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*/
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class Codec {
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public:
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Codec() {}
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virtual ~Codec() {}
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/**
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* A type of dithering.
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*/
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enum DitherType {
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/** Unknown */
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kDitherTypeUnknown,
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/** Video for Windows dithering */
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kDitherTypeVFW,
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/** QuickTime dithering */
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kDitherTypeQT
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};
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/**
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* Decode the frame for the given data and return a pointer to a surface
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* containing the decoded frame.
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*
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* @return a pointer to the decoded frame
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*/
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virtual const Graphics::Surface *decodeFrame(Common::SeekableReadStream &stream) = 0;
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/**
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* Get the format that the surface returned from decodeImage() will
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* be in.
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*/
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virtual Graphics::PixelFormat getPixelFormat() const = 0;
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/**
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* Can this codec's frames contain a palette?
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*/
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virtual bool containsPalette() const { return false; }
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/**
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* Get the palette last decoded from decodeImage
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*/
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virtual const byte *getPalette() { return 0; }
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/**
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* Does the codec have a dirty palette?
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*/
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virtual bool hasDirtyPalette() const { return false; }
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/**
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* Can the codec dither down to 8bpp?
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*/
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virtual bool canDither(DitherType type) const { return false; }
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/**
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* Activate dithering mode with a palette
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*/
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virtual void setDither(DitherType type, const byte *palette) {}
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/**
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* Create a dither table, as used by QuickTime codecs.
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*/
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static byte *createQuickTimeDitherTable(const byte *palette, uint colorCount);
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};
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/**
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* Create a codec given a bitmap/AVI compression tag and stream handler tag (can be 0)
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*/
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Codec *createBitmapCodec(uint32 tag, uint32 streamTag, int width, int height, int bitsPerPixel);
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/**
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* Create a codec given a QuickTime compression tag.
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*/
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Codec *createQuickTimeCodec(uint32 tag, int width, int height, int bitsPerPixel);
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} // End of namespace Image
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#endif
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