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/**
* @file llimagetga.h
* @brief Image implementation to compresses and decompressed TGA files.
*
* $LicenseInfo:firstyear=2001&license=viewerlgpl$
* Second Life Viewer Source Code
* Copyright (C) 2010, Linden Research, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License only.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
* $/LicenseInfo$
*/
#ifndef LL_LLIMAGETGA_H
#define LL_LLIMAGETGA_H
#include "llimage.h"
// This class compresses and decompressed TGA (targa) files
class LLImageTGA : public LLImageFormatted
{
protected:
virtual ~LLImageTGA();
public:
LLImageTGA();
LLImageTGA(const std::string& file_name);
/*virtual*/ std::string getExtension() { return std::string("tga"); }
/*virtual*/ bool updateData();
/*virtual*/ bool decode(LLImageRaw* raw_image, F32 decode_time=0.0);
/*virtual*/ bool encode(const LLImageRaw* raw_image, F32 encode_time=0.0);
bool decodeAndProcess(LLImageRaw* raw_image, F32 domain, F32 weight);
private:
bool decodeTruecolor( LLImageRaw* raw_image, bool rle, bool flipped );
bool decodeTruecolorRle8( LLImageRaw* raw_image );
bool decodeTruecolorRle15( LLImageRaw* raw_image );
bool decodeTruecolorRle24( LLImageRaw* raw_image );
bool decodeTruecolorRle32( LLImageRaw* raw_image, bool &alpha_opaque );
void decodeTruecolorPixel15( U8* dst, const U8* src );
bool decodeTruecolorNonRle( LLImageRaw* raw_image, bool &alpha_opaque );
bool decodeColorMap( LLImageRaw* raw_image, bool rle, bool flipped );
void decodeColorMapPixel8(U8* dst, const U8* src);
void decodeColorMapPixel15(U8* dst, const U8* src);
void decodeColorMapPixel24(U8* dst, const U8* src);
void decodeColorMapPixel32(U8* dst, const U8* src);
bool loadFile(const std::string& file_name);
private:
// Class specific data
U32 mDataOffset; // Offset from start of data to the actual header.
// Data from header
U8 mIDLength; // Length of identifier string
U8 mColorMapType; // 0 = No Map
U8 mImageType; // Supported: 2 = Uncompressed true color, 3 = uncompressed monochrome without colormap
U8 mColorMapIndexLo; // First color map entry (low order byte)
U8 mColorMapIndexHi; // First color map entry (high order byte)
U8 mColorMapLengthLo; // Color map length (low order byte)
U8 mColorMapLengthHi; // Color map length (high order byte)
U8 mColorMapDepth; // Size of color map entry (15, 16, 24, or 32 bits)
U8 mXOffsetLo; // X offset of image (low order byte)
U8 mXOffsetHi; // X offset of image (hi order byte)
U8 mYOffsetLo; // Y offset of image (low order byte)
U8 mYOffsetHi; // Y offset of image (hi order byte)
U8 mWidthLo; // Width (low order byte)
U8 mWidthHi; // Width (hi order byte)
U8 mHeightLo; // Height (low order byte)
U8 mHeightHi; // Height (hi order byte)
U8 mPixelSize; // 8, 16, 24, 32 bits per pixel
U8 mAttributeBits; // 4 bits: number of attributes per pixel
U8 mOriginRightBit; // 1 bit: origin, 0 = left, 1 = right
U8 mOriginTopBit; // 1 bit: origin, 0 = bottom, 1 = top
U8 mInterleave; // 2 bits: interleaved flag, 0 = none, 1 = interleaved 2, 2 = interleaved 4
U8* mColorMap;
S32 mColorMapStart;
S32 mColorMapLength;
S32 mColorMapBytesPerEntry;
bool mIs15Bit;
static const U8 s5to8bits[32];
};
#endif
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