void filterOnlyImages(strings& files)
{
strings out; // O(N)
for (size_t u = 0; u < files.size(); u++)
{
if (isSupportedImageType(files[u]))
{
out.push_back(files[u]);
}
}
files = out;
}
void TGA::readHeader(Common::SeekableReadStream &tga, ImageType &imageType, byte &pixelDepth, byte &imageDesc) {
tga.seek(0);
// TGAs have an optional "id" string in the header
uint32 idLength = tga.readByte();
// Number of colors in the color map / palette
if (tga.readByte() != 0)
throw Common::Exception("Unsupported feature: Color map");
// Image type. 2 == unmapped RGB, 3 == Grayscale
imageType = (ImageType)tga.readByte();
if (!isSupportedImageType(imageType))
throw Common::Exception("Unsupported image type: %d", imageType);
// Color map specifications + X + Y
tga.skip(5 + 2 + 2);
_mipMaps.push_back(new MipMap);
// Image dimensions
_mipMaps[0]->width = tga.readUint16LE();
_mipMaps[0]->height = tga.readUint16LE();
// Bits per pixel
pixelDepth = tga.readByte();
if (imageType == kImageTypeTrueColor || imageType == kImageTypeRLETrueColor) {
if (pixelDepth == 24) {
_format = kPixelFormatB8G8R8;
} else if (pixelDepth == 16 || pixelDepth == 32) {
_format = kPixelFormatB8G8R8A8;
} else if (pixelDepth == 8) {
imageType = kImageTypeBW;
_format = kPixelFormatB8G8R8A8;
} else
throw Common::Exception("Unsupported pixel depth: %d, %d", imageType, pixelDepth);
} else if (imageType == kImageTypeBW) {
if (pixelDepth != 8)
throw Common::Exception("Unsupported pixel depth: %d, %d", imageType, pixelDepth);
_format = kPixelFormatB8G8R8A8;
}
// Image descriptor
imageDesc = tga.readByte();
// Skip the id string
tga.skip(idLength);
}
