static void copyRGB( Image& dst, const uint8_t* p, size_t pStride )
{
IMapScoped<uint8_t> map( dst );
size_t h = dst.height();
SIMD* simd = SIMD::instance();
size_t n = dst.width() * 3;
while( h-- ){
simd->Conv_XXXu8_to_XXXAu8( map.ptr(), p, n );
map++;
p += pStride;
}
}
/*
Supported combinations of depth and attribute-bits:
Depth Attribute-Bits
----------------------
48 0 TODO
32 8
32 0
24 0
16 1 TODO
16 0 TODO
15 0 TODO
*/
static void tga_decode_color( Image& img, FILE* file, TGAHeader* header, TGAExtension* ext )
{
uint8_t* dst;
uint8_t* pdst;
size_t stride;
size_t height;
ssize_t sstride;
size_t read;
size_t dataoffset;
IFormat format( IFormat::BGRA_UINT8 ); // Assume BGRA_UINT8
uint8_t alphabits = header->desc & TGA_ALPHABIT_MASK;
/*seek to data*/
dataoffset = TGA_HEADER_SIZE + header->idlength;
if( fseek( file, dataoffset, SEEK_SET ) < 0 )
throw CVTException( "Corrupted TGA file! " );
if( header->depth == 32 && ( alphabits == 8 || alphabits == 0 ) ) {
/* Extension area available */
if( ext ) {
if( ext->attributes == 3 || ext->attributes == 4 /* FIXME: premultiplied*/ )
format = IFormat::BGRA_UINT8;
else
throw CVTException( "Unsupported TGA file!" );
}
img.reallocate( header->width, header->height, format );
dst = img.map( &stride );
height = header->height;
sstride = stride;
pdst = ( uint8_t* ) tga_origin( header, dst, &sstride );
while( height-- ) {
if( ( read = fread( pdst, sizeof( uint32_t ), header->width, file ) ) != header->width )
throw CVTException( "Corrupted TGA file!" );
// FIXME: set arbitrary alpha to 1
/* if( !alphabits )
ziutil_xxxa_to_xxx1_ub( dst, dst, header->width );*/
pdst += sstride;
}
img.unmap( dst );
} else if( header->depth == 24 && alphabits == 0 ) {
img.reallocate( header->width, header->height, IFormat::BGRA_UINT8 );
dst = img.map( &stride );
height = header->height;
sstride = stride;
pdst = ( uint8_t* ) tga_origin( header, dst, &sstride );
//uint8_t* buffer = new uint8_t[ header->width * 3 ];
ScopedBuffer<uint8_t,true> buffer( header->width * 3 );
SIMD* simd = SIMD::instance();
while( height-- ) {
if( ( read = fread( buffer.ptr(), sizeof( uint8_t ), header->width * 3, file ) ) != ( size_t ) header->width * 3 )
throw CVTException( "Corrupted TGA file!" );
simd->Conv_XXXu8_to_XXXAu8( pdst, buffer.ptr(), header->width * 3 );
pdst += sstride;
}
img.unmap( dst );
} else {
throw CVTException( "Unsupported TGA file!" );
}
}