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10f0e39e46
Nothing good could come out of putting negative values into any of those functions. And they are used a lot in image loaders which often can be tricked into passing large enough values to make those functions be called with negative numbers. git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@6389 dfc29bdd-3216-0410-991c-e03cc46cb475
146 lines
4.1 KiB
C++
146 lines
4.1 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 "CImageWriterTGA.h"
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#ifdef _IRR_COMPILE_WITH_TGA_WRITER_
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#include "CImageLoaderTGA.h"
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#include "IWriteFile.h"
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#include "CColorConverter.h"
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#include "irrString.h"
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#include "os.h"
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namespace irr
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{
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namespace video
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{
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IImageWriter* createImageWriterTGA()
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{
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return new CImageWriterTGA;
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}
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CImageWriterTGA::CImageWriterTGA()
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{
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#ifdef _DEBUG
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setDebugName("CImageWriterTGA");
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#endif
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}
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bool CImageWriterTGA::isAWriteableFileExtension(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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bool CImageWriterTGA::writeImage(io::IWriteFile *file, IImage *image,u32 param) const
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{
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STGAHeader imageHeader;
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imageHeader.IdLength = 0;
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imageHeader.ColorMapType = 0;
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imageHeader.ImageType = 2;
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imageHeader.FirstEntryIndex[0] = 0;
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imageHeader.FirstEntryIndex[1] = 0;
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imageHeader.ColorMapLength = 0;
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imageHeader.ColorMapEntrySize = 0;
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imageHeader.XOrigin[0] = 0;
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imageHeader.XOrigin[1] = 0;
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imageHeader.YOrigin[0] = 0;
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imageHeader.YOrigin[1] = 0;
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imageHeader.ImageWidth = image->getDimension().Width;
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imageHeader.ImageHeight = image->getDimension().Height;
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// top left of image is the top. the image loader needs to
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// be fixed to only swap/flip
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imageHeader.ImageDescriptor = (1 << 5);
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// chances are good we'll need to swizzle data, so I'm going
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// to convert and write one scan line at a time. it's also
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// a bit cleaner this way
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void (*CColorConverter_convertFORMATtoFORMAT)(const void*, u32, void*) = 0;
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switch(image->getColorFormat())
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{
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case ECF_A8R8G8B8:
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CColorConverter_convertFORMATtoFORMAT
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= CColorConverter::convert_A8R8G8B8toA8R8G8B8;
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imageHeader.PixelDepth = 32;
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imageHeader.ImageDescriptor |= 8;
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break;
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case ECF_A1R5G5B5:
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CColorConverter_convertFORMATtoFORMAT
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= CColorConverter::convert_A1R5G5B5toA1R5G5B5;
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imageHeader.PixelDepth = 16;
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imageHeader.ImageDescriptor |= 1;
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break;
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case ECF_R5G6B5:
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CColorConverter_convertFORMATtoFORMAT
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= CColorConverter::convert_R5G6B5toA1R5G5B5;
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imageHeader.PixelDepth = 16;
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imageHeader.ImageDescriptor |= 1;
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break;
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case ECF_R8G8B8:
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CColorConverter_convertFORMATtoFORMAT
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= CColorConverter::convert_R8G8B8toR8G8B8;
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imageHeader.PixelDepth = 24;
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imageHeader.ImageDescriptor |= 0;
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break;
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default:
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os::Printer::log("CImageWriterTGA does not support image format", ColorFormatNames[image->getColorFormat()], ELL_WARNING);
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break;
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}
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// couldn't find a color converter
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if (!CColorConverter_convertFORMATtoFORMAT)
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return false;
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if (file->write(&imageHeader, sizeof(imageHeader)) != sizeof(imageHeader))
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return false;
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u8* scan_lines = (u8*)image->getData();
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if (!scan_lines)
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return false;
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// size of one pixel in bytes
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u32 pixel_size = image->getBytesPerPixel();
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// length of one row of the source image in bytes
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u32 row_stride = (pixel_size * imageHeader.ImageWidth);
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// length of one output row in bytes
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size_t row_size = ((imageHeader.PixelDepth / 8) * imageHeader.ImageWidth);
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// allocate a row do translate data into
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u8* row_pointer = new u8[row_size];
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u32 y;
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for (y = 0; y < imageHeader.ImageHeight; ++y)
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{
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// source, length [pixels], destination
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if (image->getColorFormat()==ECF_R8G8B8)
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CColorConverter::convert24BitTo24Bit(&scan_lines[y * row_stride], row_pointer, imageHeader.ImageWidth, 1, 0, 0, true);
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else
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CColorConverter_convertFORMATtoFORMAT(&scan_lines[y * row_stride], imageHeader.ImageWidth, row_pointer);
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if (file->write(row_pointer, row_size) != row_size)
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break;
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}
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delete [] row_pointer;
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STGAFooter imageFooter;
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imageFooter.ExtensionOffset = 0;
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imageFooter.DeveloperOffset = 0;
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strncpy(imageFooter.Signature, "TRUEVISION-XFILE.", 18);
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if (file->write(&imageFooter, sizeof(imageFooter)) < (s32)sizeof(imageFooter))
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return false;
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return imageHeader.ImageHeight <= y;
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}
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} // namespace video
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} // namespace irr
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#endif
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