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102 lines
3.2 KiB
C++
102 lines
3.2 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
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (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, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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*/
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/* Based on code from eos https://github.com/DrMcCoy/xoreos/
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* relicensed under GPLv2+ with permission from DrMcCoy and clone2727
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*/
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/*
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* TGA decoder used in engines:
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* - titanic
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* - wintermute
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* - zvision
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*/
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#ifndef IMAGE_TGA_H
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#define IMAGE_TGA_H
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#include "graphics/surface.h"
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#include "image/image_decoder.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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/** TarGa image-decoder
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* The following variations of TGA are supported:
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* - Type 1 - Color-mapped images in 16/24/32 bpp with 8 bit indexes
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* - Type 2 - 16/24/32 bpp Top AND Bottom origined.
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* - Type 3 - Black/White images, 8bpp.
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* - Type 9 - RLE-encoded color-mapped images. (8 bit indexes only)
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* - Type 10 - RLE-encoded TrueColor, 24/32bpp.
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* - Type 11 - RLE-encoded Black/White, 8bpp.
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*
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* No images are returned with a palette, instead they are converted
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* to 16 bpp for Type 1, or 32 bpp for Black/White-images.
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*/
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class TGADecoder : public ImageDecoder {
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public:
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TGADecoder();
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virtual ~TGADecoder();
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virtual void destroy();
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virtual const Graphics::Surface *getSurface() const { return &_surface; }
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virtual const byte *getPalette() const { return _colorMap; }
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virtual uint16 getPaletteColorCount() const { return _colorMapLength; }
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virtual bool loadStream(Common::SeekableReadStream &stream);
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private:
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// Format-spec from:
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//http://www.ludorg.net/amnesia/TGA_File_Format_Spec.html
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enum {
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TYPE_CMAP = 1,
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TYPE_TRUECOLOR = 2,
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TYPE_BW = 3,
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TYPE_RLE_CMAP = 9,
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TYPE_RLE_TRUECOLOR = 10,
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TYPE_RLE_BW = 11
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};
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// Color-map:
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bool _colorMapSize;
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byte *_colorMap;
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int16 _colorMapOrigin;
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int16 _colorMapLength;
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byte _colorMapEntryLength;
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// Origin may be at the top, or bottom
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bool _originTop;
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Graphics::PixelFormat _format;
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Graphics::Surface _surface;
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// Loading helpers
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bool readHeader(Common::SeekableReadStream &tga, byte &imageType, byte &pixelDepth);
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bool readData(Common::SeekableReadStream &tga, byte imageType, byte pixelDepth);
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bool readDataColorMapped(Common::SeekableReadStream &tga, byte imageType, byte indexDepth);
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bool readDataRLE(Common::SeekableReadStream &tga, byte imageType, byte pixelDepth);
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bool readColorMap(Common::SeekableReadStream &tga, byte imageType, byte pixelDepth);
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};
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} // End of namespace Image
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#endif
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