//-------------------------------------------------------------------------------------
// Decompression
//-------------------------------------------------------------------------------------
_Use_decl_annotations_
HRESULT Decompress( const Image& cImage, DXGI_FORMAT format, ScratchImage& image )
{
if ( !IsCompressed(cImage.format) || IsCompressed(format) )
return E_INVALIDARG;
if ( format == DXGI_FORMAT_UNKNOWN )
{
// Pick a default decompressed format based on BC input format
format = _DefaultDecompress( cImage.format );
if ( format == DXGI_FORMAT_UNKNOWN )
{
// Input is not a compressed format
return E_INVALIDARG;
}
}
else
{
if ( !IsValid(format) )
return E_INVALIDARG;
if ( IsTypeless(format) || IsPlanar(format) || IsPalettized(format) )
return HRESULT_FROM_WIN32( ERROR_NOT_SUPPORTED );
}
// Create decompressed image
HRESULT hr = image.Initialize2D( format, cImage.width, cImage.height, 1, 1 );
if ( FAILED(hr) )
return hr;
const Image *img = image.GetImage( 0, 0, 0 );
if ( !img )
{
image.Release();
return E_POINTER;
}
// Decompress single image
hr = _DecompressBC( cImage, *img );
if ( FAILED(hr) )
image.Release();
return hr;
}
HRESULT Decompress( const Image* cImages, size_t nimages, const TexMetadata& metadata,
DXGI_FORMAT format, ScratchImage& images )
{
if ( !cImages || !nimages )
return E_INVALIDARG;
if ( IsCompressed(format) || IsTypeless(format) )
return E_INVALIDARG;
if ( format == DXGI_FORMAT_UNKNOWN )
{
// Pick a default decompressed format based on BC input format
format = _DefaultDecompress( cImages[0].format );
if ( format == DXGI_FORMAT_UNKNOWN )
{
// Input is not a compressed format
return E_FAIL;
}
}
else if ( !IsValid(format) )
return E_INVALIDARG;
images.Release();
TexMetadata mdata2 = metadata;
mdata2.format = format;
HRESULT hr = images.Initialize( mdata2 );
if ( FAILED(hr) )
return hr;
if ( nimages != images.GetImageCount() )
{
images.Release();
return E_FAIL;
}
const Image* dest = images.GetImages();
if ( !dest )
{
images.Release();
return E_POINTER;
}
for( size_t index=0; index < nimages; ++index )
{
assert( dest[ index ].format == format );
const Image& src = cImages[ index ];
if ( !IsCompressed( src.format ) )
{
images.Release();
return E_FAIL;
}
if ( src.width != dest[ index ].width || src.height != dest[ index ].height )
{
images.Release();
return E_FAIL;
}
hr = _DecompressBC( src, dest[ index ] );
if ( FAILED(hr) )
{
images.Release();
return hr;
}
}
return S_OK;
}
