//! creates a surface from the file
IImage* CImageLoaderTGA::loadImage(io::IReadFile* file) const
{
STGAHeader header;
u32 *palette = 0;
file->read(&header, sizeof(STGAHeader));
#ifdef __BIG_ENDIAN__
header.ColorMapLength = os::Byteswap::byteswap(header.ColorMapLength);
header.ImageWidth = os::Byteswap::byteswap(header.ImageWidth);
header.ImageHeight = os::Byteswap::byteswap(header.ImageHeight);
#endif
// skip image identification field
if (header.IdLength)
file->seek(header.IdLength, true);
if (header.ColorMapType)
{
// create 32 bit palette
palette = new u32[ header.ColorMapLength];
// read color map
u8 * colorMap = new u8[header.ColorMapEntrySize/8 * header.ColorMapLength];
file->read(colorMap,header.ColorMapEntrySize/8 * header.ColorMapLength);
// convert to 32-bit palette
switch ( header.ColorMapEntrySize )
{
case 16:
CColorConverter::convert_A1R5G5B5toA8R8G8B8(colorMap, header.ColorMapLength, palette);
break;
case 24:
CColorConverter::convert_B8G8R8toA8R8G8B8(colorMap, header.ColorMapLength, palette);
break;
case 32:
CColorConverter::convert_B8G8R8A8toA8R8G8B8(colorMap, header.ColorMapLength, palette);
break;
}
delete [] colorMap;
}
// read image
u8* data = 0;
if ( header.ImageType == 1 || // Uncompressed, color-mapped images.
header.ImageType == 2 || // Uncompressed, RGB images
header.ImageType == 3 // Uncompressed, black and white images
)
{
const s32 imageSize = header.ImageHeight * header.ImageWidth * header.PixelDepth/8;
data = new u8[imageSize];
file->read(data, imageSize);
}
else
if(header.ImageType == 10)
{
// Runlength encoded RGB images
data = loadCompressedImage(file, header);
}
else
{
os::Printer::log("Unsupported TGA file type", file->getFileName(), ELL_ERROR);
delete [] palette;
return 0;
}
IImage* image = 0;
switch(header.PixelDepth)
{
case 8:
{
if (header.ImageType==3) // grey image
{
image = new CImage(ECF_R8G8B8,
core::dimension2d<u32>(header.ImageWidth, header.ImageHeight));
if (image)
CColorConverter::convert8BitTo24Bit((u8*)data,
(u8*)image->getData(),
header.ImageWidth,header.ImageHeight,
0, 0, (header.ImageDescriptor&0x20)==0);
}
else
{
image = new CImage(ECF_A1R5G5B5,
core::dimension2d<u32>(header.ImageWidth, header.ImageHeight));
if (image)
CColorConverter::convert8BitTo16Bit((u8*)data,
(s16*)image->getData(),
header.ImageWidth,header.ImageHeight,
(s32*) palette, 0,
(header.ImageDescriptor&0x20)==0);
}
}
break;
case 16:
image = new CImage(ECF_A1R5G5B5,
core::dimension2d<u32>(header.ImageWidth, header.ImageHeight));
if (image)
CColorConverter::convert16BitTo16Bit((s16*)data,
(s16*)image->getData(), header.ImageWidth, header.ImageHeight, 0, (header.ImageDescriptor&0x20)==0);
break;
case 24:
image = new CImage(ECF_R8G8B8,
core::dimension2d<u32>(header.ImageWidth, header.ImageHeight));
if (image)
CColorConverter::convert24BitTo24Bit(
(u8*)data, (u8*)image->getData(), header.ImageWidth, header.ImageHeight, 0, (header.ImageDescriptor&0x20)==0, true);
break;
case 32:
image = new CImage(ECF_A8R8G8B8,
core::dimension2d<u32>(header.ImageWidth, header.ImageHeight));
if (image)
CColorConverter::convert32BitTo32Bit((s32*)data,
(s32*)image->getData(), header.ImageWidth, header.ImageHeight, 0, (header.ImageDescriptor&0x20)==0);
break;
default:
os::Printer::log("Unsupported TGA format", file->getFileName(), ELL_ERROR);
break;
}
delete [] data;
delete [] palette;
return image;
}
//! creates a surface from the file
IImage* CImageLoaderTGA::loadImage(irr::io::IReadFile* file)
{
STGAHeader header;
u8* colorMap = 0;
file->read(&header, sizeof(STGAHeader));
#ifdef __BIG_ENDIAN__
header.ColorMapLength = os::Byteswap::byteswap(header.ColorMapLength);
header.ImageWidth = os::Byteswap::byteswap(header.ImageWidth);
header.ImageHeight = os::Byteswap::byteswap(header.ImageHeight);
#endif
// skip image identification field
if (header.IdLength)
file->seek(header.IdLength, true);
if (header.ColorMapType)
{
// read color map
colorMap = new u8[header.ColorMapEntrySize/8 * header.ColorMapLength];
file->read(colorMap,header.ColorMapEntrySize/8 * header.ColorMapLength);
}
// read image
u8* data = 0;
if (header.ImageType == 2)
{
const s32 imageSize = header.ImageHeight * header.ImageWidth * header.PixelDepth/8;
data = new u8[imageSize];
file->read(data, imageSize);
}
else if(header.ImageType == 10)
data = loadCompressedImage(file, header);
else
{
os::Printer::log("Unsupported TGA file type", file->getFileName(), ELL_ERROR);
if (colorMap)
delete [] colorMap;
return 0;
}
IImage* image = 0;
switch(header.PixelDepth)
{
case 16:
{
image = new CImage(ECF_A1R5G5B5,
core::dimension2d<s32>(header.ImageWidth, header.ImageHeight));
if (image)
CColorConverter::convert16BitTo16Bit((s16*)data,
(s16*)image->lock(), header.ImageWidth, header.ImageHeight, 0, (header.ImageDescriptor&0x20)==0);
}
break;
case 24:
{
image = new CImage(ECF_R8G8B8,
core::dimension2d<s32>(header.ImageWidth, header.ImageHeight));
if (image)
CColorConverter::convert24BitTo24Bit(
(u8*)data, (u8*)image->lock(), header.ImageWidth, header.ImageHeight, 0, (header.ImageDescriptor&0x20)==0, true);
}
break;
case 32:
{
image = new CImage(ECF_A8R8G8B8,
core::dimension2d<s32>(header.ImageWidth, header.ImageHeight));
if (image)
CColorConverter::convert32BitTo32Bit((s32*)data,
(s32*)image->lock(), header.ImageWidth, header.ImageHeight, 0, (header.ImageDescriptor&0x20)==0);
}
break;
default:
os::Printer::log("Unsupported TGA format", file->getFileName(), ELL_ERROR);
break;
}
if (image)
image->unlock();
delete [] data;
if (colorMap)
delete [] colorMap;
return image;
}
