mirror of https://github.com/minetest/irrlicht.git
285 lines
7.9 KiB
C++
285 lines
7.9 KiB
C++
// Copyright (C) 2002-2012 Nikolaus Gebhardt
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// This file is part of the "Irrlicht Engine".
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// For conditions of distribution and use, see copyright notice in irrlicht.h
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#include "CImageLoaderTGA.h"
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#include "IReadFile.h"
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#include "os.h"
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#include "CColorConverter.h"
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#include "CImage.h"
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#include "irrString.h"
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#define MAX(x, y) (((x) > (y)) ? (x) : (y))
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namespace irr
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{
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namespace video
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{
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//! returns true if the file maybe is able to be loaded by this class
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//! based on the file extension (e.g. ".tga")
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bool CImageLoaderTGA::isALoadableFileExtension(const io::path& filename) const
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{
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return core::hasFileExtension ( filename, "tga" );
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}
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//! loads a compressed tga.
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u8 *CImageLoaderTGA::loadCompressedImage(io::IReadFile *file, const STGAHeader& header) const
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{
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// This was written and sent in by Jon Pry, thank you very much!
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// I only changed the formatting a little bit.
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const u32 bytesPerPixel = header.PixelDepth/8;
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const u32 imageSize = header.ImageHeight * header.ImageWidth * bytesPerPixel;
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u8* data = new u8[imageSize];
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u32 currentByte = 0;
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while(currentByte < imageSize)
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{
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u8 chunkheader = 0;
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file->read(&chunkheader, sizeof(u8)); // Read The Chunk's Header
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if(chunkheader < 128) // If The Chunk Is A 'RAW' Chunk
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{
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chunkheader++; // Add 1 To The Value To Get Total Number Of Raw Pixels
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const u32 bytesToRead = bytesPerPixel * chunkheader;
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if ( currentByte+bytesToRead <= imageSize )
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{
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file->read(&data[currentByte], bytesToRead);
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currentByte += bytesToRead;
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}
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else
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{
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os::Printer::log("Compressed TGA file RAW chunk tries writing beyond buffer", file->getFileName(), ELL_WARNING);
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break;
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}
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}
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else
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{
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// thnx to neojzs for some fixes with this code
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// If It's An RLE Header
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chunkheader -= 127; // Subtract 127 To Get Rid Of The ID Bit
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u32 dataOffset = currentByte;
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if ( dataOffset+bytesPerPixel < imageSize )
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{
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file->read(&data[dataOffset], bytesPerPixel);
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currentByte += bytesPerPixel;
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}
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else
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{
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os::Printer::log("Compressed TGA file RLE headertries writing beyond buffer", file->getFileName(), ELL_WARNING);
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break;
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}
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for(u32 counter = 1; counter < chunkheader; counter++)
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{
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if ( currentByte + bytesPerPixel <= imageSize )
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{
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for(u32 elementCounter=0; elementCounter < bytesPerPixel; elementCounter++)
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{
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data[currentByte + elementCounter] = data[dataOffset + elementCounter];
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}
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}
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currentByte += bytesPerPixel;
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}
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}
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}
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return data;
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}
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//! returns true if the file maybe is able to be loaded by this class
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bool CImageLoaderTGA::isALoadableFileFormat(io::IReadFile* file) const
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{
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if (!file)
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return false;
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STGAFooter footer;
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memset(&footer, 0, sizeof(STGAFooter));
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file->seek(file->getSize()-sizeof(STGAFooter));
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file->read(&footer, sizeof(STGAFooter));
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return (!strcmp(footer.Signature,"TRUEVISION-XFILE.")); // very old tgas are refused.
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}
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//! creates a surface from the file
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IImage* CImageLoaderTGA::loadImage(io::IReadFile* file) const
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{
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STGAHeader header;
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u32 *palette = 0;
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file->read(&header, sizeof(STGAHeader));
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#ifdef __BIG_ENDIAN__
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header.ColorMapLength = os::Byteswap::byteswap(header.ColorMapLength);
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header.ImageWidth = os::Byteswap::byteswap(header.ImageWidth);
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header.ImageHeight = os::Byteswap::byteswap(header.ImageHeight);
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#endif
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if (!checkImageDimensions(header.ImageWidth, header.ImageHeight))
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{
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os::Printer::log("Image dimensions too large in file", file->getFileName(), ELL_ERROR);
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return 0;
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}
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// skip image identification field
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if (header.IdLength)
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file->seek(header.IdLength, true);
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if (header.ColorMapType)
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{
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// Create 32 bit palette
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// `core::max_()` is not used here because it takes its inputs as references. Since `header` is packed, use the macro `MAX()` instead:
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const irr::u16 paletteSize = MAX((u16)256u, header.ColorMapLength); // ColorMapLength can lie, but so far we only use palette for 8-bit, so ensure it has 256 entries
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palette = new u32[paletteSize];
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if( paletteSize > header.ColorMapLength )
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{
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// To catch images using palette colors with invalid indices
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const irr::u32 errorCol = irr::video::SColor(255,255, 0, 205).color; // bright magenta
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for ( irr::u16 i = header.ColorMapLength; i< paletteSize; ++i )
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palette[i] = errorCol;
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}
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// read color map
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u8 * colorMap = new u8[header.ColorMapEntrySize/8 * header.ColorMapLength];
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file->read(colorMap,header.ColorMapEntrySize/8 * header.ColorMapLength);
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// convert to 32-bit palette
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switch ( header.ColorMapEntrySize )
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{
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case 16:
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CColorConverter::convert_A1R5G5B5toA8R8G8B8(colorMap, header.ColorMapLength, palette);
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break;
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case 24:
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CColorConverter::convert_B8G8R8toA8R8G8B8(colorMap, header.ColorMapLength, palette);
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break;
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case 32:
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CColorConverter::convert_B8G8R8A8toA8R8G8B8(colorMap, header.ColorMapLength, palette);
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break;
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}
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delete [] colorMap;
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}
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// read image
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u8* data = 0;
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if ( header.ImageType == 1 || // Uncompressed, color-mapped images.
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header.ImageType == 2 || // Uncompressed, RGB images
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header.ImageType == 3 // Uncompressed, black and white images
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)
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{
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const s32 imageSize = header.ImageHeight * header.ImageWidth * (header.PixelDepth/8);
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data = new u8[imageSize];
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file->read(data, imageSize);
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}
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else
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if(header.ImageType == 10)
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{
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// Runlength encoded RGB images
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data = loadCompressedImage(file, header);
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}
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else
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{
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os::Printer::log("Unsupported TGA file type", file->getFileName(), ELL_ERROR);
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delete [] palette;
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return 0;
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}
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IImage* image = 0;
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switch(header.PixelDepth)
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{
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case 8:
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{
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if (header.ImageType==3) // grey image
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{
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image = new CImage(ECF_R8G8B8,
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core::dimension2d<u32>(header.ImageWidth, header.ImageHeight));
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if (image)
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CColorConverter::convert8BitTo24Bit((u8*)data,
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(u8*)image->getData(),
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header.ImageWidth,header.ImageHeight,
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0, 0, (header.ImageDescriptor&0x20)==0);
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}
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else
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{
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switch ( header.ColorMapEntrySize )
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{
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case 16:
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image = new CImage(ECF_A1R5G5B5, core::dimension2d<u32>(header.ImageWidth, header.ImageHeight));
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if ( image )
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CColorConverter::convert8BitTo16Bit((u8*)data,
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(s16*)image->getData(),
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header.ImageWidth,header.ImageHeight,
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(s32*) palette, 0,
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(header.ImageDescriptor&0x20)==0);
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break;
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// Note: 24 bit with palette would need a 24 bit palette, too lazy doing that now (textures will prefer 32-bit later anyway)
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default:
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image = new CImage(ECF_A8R8G8B8, core::dimension2d<u32>(header.ImageWidth, header.ImageHeight));
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if ( image )
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CColorConverter::convert8BitTo32Bit((u8*)data,
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(u8*)image->getData(),
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header.ImageWidth,header.ImageHeight,
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(u8*) palette, 0,
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(header.ImageDescriptor&0x20)==0);
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break;
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}
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}
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}
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break;
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case 16:
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image = new CImage(ECF_A1R5G5B5,
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core::dimension2d<u32>(header.ImageWidth, header.ImageHeight));
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if (image)
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CColorConverter::convert16BitTo16Bit((s16*)data,
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(s16*)image->getData(), header.ImageWidth, header.ImageHeight, 0, (header.ImageDescriptor&0x20)==0);
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break;
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case 24:
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image = new CImage(ECF_R8G8B8,
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core::dimension2d<u32>(header.ImageWidth, header.ImageHeight));
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if (image)
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CColorConverter::convert24BitTo24Bit(
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(u8*)data, (u8*)image->getData(), header.ImageWidth, header.ImageHeight, 0, (header.ImageDescriptor&0x20)==0, true);
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break;
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case 32:
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image = new CImage(ECF_A8R8G8B8,
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core::dimension2d<u32>(header.ImageWidth, header.ImageHeight));
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if (image)
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CColorConverter::convert32BitTo32Bit((s32*)data,
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(s32*)image->getData(), header.ImageWidth, header.ImageHeight, 0, (header.ImageDescriptor&0x20)==0);
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break;
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default:
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os::Printer::log("Unsupported TGA format", file->getFileName(), ELL_ERROR);
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break;
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}
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delete [] data;
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delete [] palette;
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return image;
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}
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//! creates a loader which is able to load tgas
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IImageLoader* createImageLoaderTGA()
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{
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return new CImageLoaderTGA();
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}
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} // end namespace video
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} // end namespace irr
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