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Diffstat (limited to 'graphics/decoders/tga.h')
| -rw-r--r-- | graphics/decoders/tga.h | 98 |
1 files changed, 98 insertions, 0 deletions
diff --git a/graphics/decoders/tga.h b/graphics/decoders/tga.h new file mode 100644 index 0000000000..dfdc5a4da9 --- /dev/null +++ b/graphics/decoders/tga.h @@ -0,0 +1,98 @@ +/* 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. + */ + +/* Based on code from eos https://github.com/DrMcCoy/xoreos/ + * relicensed under GPLv2+ with permission from DrMcCoy and clone2727 + */ + +/* + * TGA decoder used in engines: + * - none + */ + +#ifndef GRAPHICS_DECODERS_TGA_H +#define GRAPHICS_DECODERS_TGA_H + +#include "graphics/surface.h" +#include "graphics/decoders/image_decoder.h" + +namespace Common { +class SeekableReadStream; +} + +namespace Graphics { + +/** TarGa image-decoder + * The following variations of TGA are supported: + * - Type 1 - Color-mapped images in 16/24/32 bpp with 8 bit indexes + * - Type 2 - 16/24/32 bpp Top AND Bottom origined. + * - Type 3 - Black/White images, 8bpp. + * - Type 9 - RLE-encoded color-mapped images. (8 bit indexes only) + * - Type 10 - RLE-encoded TrueColor, 24/32bpp. + * - Type 11 - RLE-encoded Black/White, 8bpp. + * + * No images are returned with a palette, instead they are converted + * to 16 bpp for Type 1, or 32 bpp for Black/White-images. + */ +class TGADecoder : public ImageDecoder { +public: + TGADecoder(); + virtual ~TGADecoder(); + virtual void destroy(); + virtual const Surface *getSurface() const { return &_surface; } + virtual const byte *getPalette() const { return _colorMap; } + virtual uint16 getPaletteColorCount() const { return _colorMapLength; } + virtual bool loadStream(Common::SeekableReadStream &stream); +private: + // Format-spec from: + //http://www.ludorg.net/amnesia/TGA_File_Format_Spec.html + enum { + TYPE_CMAP = 1, + TYPE_TRUECOLOR = 2, + TYPE_BW = 3, + TYPE_RLE_CMAP = 9, + TYPE_RLE_TRUECOLOR = 10, + TYPE_RLE_BW = 11 + }; + + // Color-map: + bool _colorMapSize; + byte *_colorMap; + int16 _colorMapOrigin; + int16 _colorMapLength; + byte _colorMapEntryLength; + + // Origin may be at the top, or bottom + bool _originTop; + + PixelFormat _format; + Surface _surface; + // Loading helpers + bool readHeader(Common::SeekableReadStream &tga, byte &imageType, byte &pixelDepth); + bool readData(Common::SeekableReadStream &tga, byte imageType, byte pixelDepth); + bool readDataColorMapped(Common::SeekableReadStream &tga, byte imageType, byte indexDepth); + bool readDataRLE(Common::SeekableReadStream &tga, byte imageType, byte pixelDepth); + bool readColorMap(Common::SeekableReadStream &tga, byte imageType, byte pixelDepth); +}; + +} // End of namespace Graphics + +#endif // GRAPHICS_DECODERS_TGA_H |