//==============================================================================
static ANKI_USE_RESULT Error loadCompressedTga(
File& fs, U32& width, U32& height, U32& bpp, DArray<U8>& data,
GenericMemoryPoolAllocator<U8>& alloc)
{
Array<U8, 6> header6;
ANKI_CHECK(fs.read(reinterpret_cast<char*>(&header6[0]), sizeof(header6)));
width = header6[1] * 256 + header6[0];
height = header6[3] * 256 + header6[2];
bpp = header6[4];
if((width <= 0) || (height <= 0) || ((bpp != 24) && (bpp != 32)))
{
ANKI_LOGE("Invalid texture information");
return ErrorCode::USER_DATA;
}
I bytesPerPxl = (bpp / 8);
I imageSize = bytesPerPxl * width * height;
data.create(alloc, imageSize);
U pixelcount = height * width;
U currentpixel = 0;
U currentbyte = 0;
U8 colorbuffer[4];
do
{
U8 chunkheader = 0;
ANKI_CHECK(fs.read((char*)&chunkheader, sizeof(U8)));
if(chunkheader < 128)
{
chunkheader++;
for(int counter = 0; counter < chunkheader; counter++)
{
ANKI_CHECK(fs.read((char*)&colorbuffer[0], bytesPerPxl));
data[currentbyte] = colorbuffer[2];
data[currentbyte + 1] = colorbuffer[1];
data[currentbyte + 2] = colorbuffer[0];
if(bytesPerPxl == 4)
{
data[currentbyte + 3] = colorbuffer[3];
}
currentbyte += bytesPerPxl;
currentpixel++;
if(currentpixel > pixelcount)
{
ANKI_LOGE("Too many pixels read");
return ErrorCode::USER_DATA;
}
}
}
else
{
chunkheader -= 127;
ANKI_CHECK(fs.read((char*)&colorbuffer[0], bytesPerPxl));
for(int counter = 0; counter < chunkheader; counter++)
{
data[currentbyte] = colorbuffer[2];
data[currentbyte + 1] = colorbuffer[1];
data[currentbyte + 2] = colorbuffer[0];
if(bytesPerPxl == 4)
{
data[currentbyte + 3] = colorbuffer[3];
}
currentbyte += bytesPerPxl;
currentpixel++;
if(currentpixel > pixelcount)
{
ANKI_LOGE("Too many pixels read");
data.destroy(alloc);
return ErrorCode::USER_DATA;
}
}
}
} while(currentpixel < pixelcount);
return ErrorCode::NONE;
}
