DeprecatedForks/crossxtex
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity
65de5a1f37
crossxtex/DirectXTex/DirectXTexCompress.cpp

780 lines
25 KiB
C++
Raw Blame History

//-------------------------------------------------------------------------------------
// DirectXTexCompress.cpp
//
// DirectX Texture Library - Texture compression
//
// THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF
// ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO
// THE IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A
// PARTICULAR PURPOSE.
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
// http://go.microsoft.com/fwlink/?LinkId=248926
//-------------------------------------------------------------------------------------
#include "directxtexp.h"
#ifdef _OPENMP
#include <omp.h>
#pragma warning(disable : 4616 6993)
#endif
#include "bc.h"
namespace DirectX
{
inline static DWORD _GetBCFlags( _In_ DWORD compress )
{
static_assert( TEX_COMPRESS_RGB_DITHER == BC_FLAGS_DITHER_RGB, "TEX_COMPRESS_* flags should match BC_FLAGS_*" );
static_assert( TEX_COMPRESS_A_DITHER == BC_FLAGS_DITHER_A, "TEX_COMPRESS_* flags should match BC_FLAGS_*" );
static_assert( TEX_COMPRESS_DITHER == (BC_FLAGS_DITHER_RGB | BC_FLAGS_DITHER_A), "TEX_COMPRESS_* flags should match BC_FLAGS_*" );
static_assert( TEX_COMPRESS_UNIFORM == BC_FLAGS_UNIFORM, "TEX_COMPRESS_* flags should match BC_FLAGS_*" );
return ( compress & (BC_FLAGS_DITHER_RGB|BC_FLAGS_DITHER_A|BC_FLAGS_UNIFORM) );
}
inline static bool _DetermineEncoderSettings( _In_ DXGI_FORMAT format, _Out_ BC_ENCODE& pfEncode, _Out_ size_t& blocksize, _Out_ DWORD& cflags )
{
switch(format)
{
case DXGI_FORMAT_BC1_UNORM:
case DXGI_FORMAT_BC1_UNORM_SRGB: pfEncode = nullptr; blocksize = 8; cflags = 0; break;
case DXGI_FORMAT_BC2_UNORM:
case DXGI_FORMAT_BC2_UNORM_SRGB: pfEncode = D3DXEncodeBC2; blocksize = 16; cflags = 0; break;
case DXGI_FORMAT_BC3_UNORM:
case DXGI_FORMAT_BC3_UNORM_SRGB: pfEncode = D3DXEncodeBC3; blocksize = 16; cflags = 0; break;
case DXGI_FORMAT_BC4_UNORM: pfEncode = D3DXEncodeBC4U; blocksize = 8; cflags = TEX_FILTER_RGB_COPY_RED; break;
case DXGI_FORMAT_BC4_SNORM: pfEncode = D3DXEncodeBC4S; blocksize = 8; cflags = TEX_FILTER_RGB_COPY_RED; break;
case DXGI_FORMAT_BC5_UNORM: pfEncode = D3DXEncodeBC5U; blocksize = 16; cflags = TEX_FILTER_RGB_COPY_RED | TEX_FILTER_RGB_COPY_GREEN; break;
case DXGI_FORMAT_BC5_SNORM: pfEncode = D3DXEncodeBC5S; blocksize = 16; cflags = TEX_FILTER_RGB_COPY_RED | TEX_FILTER_RGB_COPY_GREEN; break;
case DXGI_FORMAT_BC6H_UF16: pfEncode = D3DXEncodeBC6HU; blocksize = 16; cflags = 0; break;
case DXGI_FORMAT_BC6H_SF16: pfEncode = D3DXEncodeBC6HS; blocksize = 16; cflags = 0; break;
case DXGI_FORMAT_BC7_UNORM:
case DXGI_FORMAT_BC7_UNORM_SRGB: pfEncode = D3DXEncodeBC7; blocksize = 16; cflags = 0; break;
default: pfEncode = nullptr; blocksize = 0; cflags = 0; return false;
}
return true;
}
//-------------------------------------------------------------------------------------
static HRESULT _CompressBC( _In_ const Image& image, _In_ const Image& result, _In_ DWORD bcflags,
_In_ float alphaRef )
{
if ( !image.pixels || !result.pixels )
return E_POINTER;
assert( image.width == result.width );
assert( image.height == result.height );
const DXGI_FORMAT format = image.format;
size_t sbpp = BitsPerPixel( format );
if ( !sbpp )
return E_FAIL;
if ( sbpp < 8 )
{
// We don't support compressing from monochrome (DXGI_FORMAT_R1_UNORM)
return HRESULT_FROM_WIN32( ERROR_NOT_SUPPORTED );
}
// Round to bytes
sbpp = ( sbpp + 7 ) / 8;
uint8_t *pDest = result.pixels;
// Determine BC format encoder
BC_ENCODE pfEncode;
size_t blocksize;
DWORD cflags;
if ( !_DetermineEncoderSettings( result.format, pfEncode, blocksize, cflags ) )
return HRESULT_FROM_WIN32( ERROR_NOT_SUPPORTED );
XMVECTOR temp[16];
const uint8_t *pSrc = image.pixels;
const size_t rowPitch = image.rowPitch;
for( size_t h=0; h < image.height; h += 4 )
{
const uint8_t *sptr = pSrc;
uint8_t* dptr = pDest;
size_t ph = std::min<size_t>( 4, image.height - h );
size_t w = 0;
for( size_t count = 0; count < rowPitch; count += sbpp*4, w += 4 )
{
size_t pw = std::min<size_t>( 4, image.width - w );
assert( pw > 0 && ph > 0 );
if ( !_LoadScanline( &temp[0], pw, sptr, rowPitch, format ) )
return E_FAIL;
if ( ph > 1 )
{
if ( !_LoadScanline( &temp[4], pw, sptr + rowPitch, rowPitch, format ) )
return E_FAIL;
if ( ph > 2 )
{
if ( !_LoadScanline( &temp[8], pw, sptr + rowPitch*2, rowPitch, format ) )
return E_FAIL;
if ( ph > 3 )
{
if ( !_LoadScanline( &temp[12], pw, sptr + rowPitch*3, rowPitch, format ) )
return E_FAIL;
}
}
}
if ( pw != 4 || ph != 4 )
{
// Replicate pixels for partial block
static const size_t uSrc[] = { 0, 0, 0, 1 };
if ( pw < 4 )
{
for( size_t t = 0; t < ph && t < 4; ++t )
{
for( size_t s = pw; s < 4; ++s )
{
temp[ (t << 2) | s ] = temp[ (t << 2) | uSrc[s] ];
}
}
}
if ( ph < 4 )
{
for( size_t t = ph; t < 4; ++t )
{
for( size_t s = 0; s < 4; ++s )
{
temp[ (t << 2) | s ] = temp[ (uSrc[t] << 2) | s ];
}
}
}
}
_ConvertScanline( temp, 16, result.format, format, cflags );
if ( pfEncode )
pfEncode( dptr, temp, bcflags );
else
D3DXEncodeBC1( dptr, temp, alphaRef, bcflags );
sptr += sbpp*4;
dptr += blocksize;
}
pSrc += rowPitch*4;
pDest += result.rowPitch;
}
return S_OK;
}
//-------------------------------------------------------------------------------------
#ifdef _OPENMP
static HRESULT _CompressBC_Parallel( _In_ const Image& image, _In_ const Image& result, _In_ DWORD bcflags,
_In_ float alphaRef )
{
if ( !image.pixels || !result.pixels )
return E_POINTER;
assert( image.width == result.width );
assert( image.height == result.height );
const DXGI_FORMAT format = image.format;
size_t sbpp = BitsPerPixel( format );
if ( !sbpp )
return E_FAIL;
if ( sbpp < 8 )
{
// We don't support compressing from monochrome (DXGI_FORMAT_R1_UNORM)
return HRESULT_FROM_WIN32( ERROR_NOT_SUPPORTED );
}
// Round to bytes
sbpp = ( sbpp + 7 ) / 8;
// Determine BC format encoder
BC_ENCODE pfEncode;
size_t blocksize;
DWORD cflags;
if ( !_DetermineEncoderSettings( result.format, pfEncode, blocksize, cflags ) )
return HRESULT_FROM_WIN32( ERROR_NOT_SUPPORTED );
// Refactored version of loop to support parallel independance
const size_t nBlocks = std::max<size_t>(1, (image.width + 3) / 4 ) * std::max<size_t>(1, (image.height + 3) / 4 );
bool fail = false;
#pragma omp parallel for
for( int nb=0; nb < static_cast<int>( nBlocks ); ++nb )
{
const size_t nbWidth = std::max<size_t>(1, (image.width + 3) / 4 );
const size_t y = nb / nbWidth;
const size_t x = nb - (y*nbWidth);
assert( x < image.width && y < image.height );
size_t rowPitch = image.rowPitch;
const uint8_t *pSrc = image.pixels + (y*4*rowPitch) + (x*4*sbpp);
uint8_t *pDest = result.pixels + (nb*blocksize);
size_t ph = std::min<size_t>( 4, image.height - y );
size_t pw = std::min<size_t>( 4, image.width - x );
assert( pw > 0 && ph > 0 );
XMVECTOR temp[16];
if ( !_LoadScanline( &temp[0], pw, pSrc, rowPitch, format ) )
fail = true;
if ( ph > 1 )
{
if ( !_LoadScanline( &temp[4], pw, pSrc + rowPitch, rowPitch, format ) )
fail = true;
if ( ph > 2 )
{
if ( !_LoadScanline( &temp[8], pw, pSrc + rowPitch*2, rowPitch, format ) )
fail = true;
if ( ph > 3 )
{
if ( !_LoadScanline( &temp[12], pw, pSrc + rowPitch*3, rowPitch, format ) )
fail = true;
}
}
}
if ( pw != 4 || ph != 4 )
{
// Replicate pixels for partial block
static const size_t uSrc[] = { 0, 0, 0, 1 };
if ( pw < 4 )
{
for( size_t t = 0; t < ph && t < 4; ++t )
{
for( size_t s = pw; s < 4; ++s )
{
temp[ (t << 2) | s ] = temp[ (t << 2) | uSrc[s] ];
}
}
}
if ( ph < 4 )
{
for( size_t t = ph; t < 4; ++t )
{
for( size_t s = 0; s < 4; ++s )
{
temp[ (t << 2) | s ] = temp[ (uSrc[t] << 2) | s ];
}
}
}
}
_ConvertScanline( temp, 16, result.format, format, cflags );
if ( pfEncode )
pfEncode( pDest, temp, bcflags );
else
D3DXEncodeBC1( pDest, temp, alphaRef, bcflags );
}
return (fail) ? E_FAIL : S_OK;
}
#endif // _OPENMP
//-------------------------------------------------------------------------------------
static DXGI_FORMAT _DefaultDecompress( _In_ DXGI_FORMAT format )
{
switch( format )
{
case DXGI_FORMAT_BC1_TYPELESS:
case DXGI_FORMAT_BC1_UNORM:
case DXGI_FORMAT_BC2_TYPELESS:
case DXGI_FORMAT_BC2_UNORM:
case DXGI_FORMAT_BC3_TYPELESS:
case DXGI_FORMAT_BC3_UNORM:
case DXGI_FORMAT_BC7_TYPELESS:
case DXGI_FORMAT_BC7_UNORM:
return DXGI_FORMAT_R8G8B8A8_UNORM;
case DXGI_FORMAT_BC1_UNORM_SRGB:
case DXGI_FORMAT_BC2_UNORM_SRGB:
case DXGI_FORMAT_BC3_UNORM_SRGB:
case DXGI_FORMAT_BC7_UNORM_SRGB:
return DXGI_FORMAT_R8G8B8A8_UNORM_SRGB;
case DXGI_FORMAT_BC4_TYPELESS:
case DXGI_FORMAT_BC4_UNORM:
return DXGI_FORMAT_R8_UNORM;
case DXGI_FORMAT_BC4_SNORM:
return DXGI_FORMAT_R8_SNORM;
case DXGI_FORMAT_BC5_TYPELESS:
case DXGI_FORMAT_BC5_UNORM:
return DXGI_FORMAT_R8G8_UNORM;
case DXGI_FORMAT_BC5_SNORM:
return DXGI_FORMAT_R8G8_SNORM;
case DXGI_FORMAT_BC6H_TYPELESS:
case DXGI_FORMAT_BC6H_UF16:
case DXGI_FORMAT_BC6H_SF16:
// We could use DXGI_FORMAT_R32G32B32_FLOAT here since BC6H is always Alpha 1.0,
// but this format is more supported by viewers
return DXGI_FORMAT_R32G32B32A32_FLOAT;
default:
return DXGI_FORMAT_UNKNOWN;
}
}
//-------------------------------------------------------------------------------------
static HRESULT _DecompressBC( _In_ const Image& cImage, _In_ const Image& result )
{
if ( !cImage.pixels || !result.pixels )
return E_POINTER;
assert( cImage.width == result.width );
assert( cImage.height == result.height );
const DXGI_FORMAT format = result.format;
size_t dbpp = BitsPerPixel( format );
if ( !dbpp )
return E_FAIL;
if ( dbpp < 8 )
{
// We don't support decompressing to monochrome (DXGI_FORMAT_R1_UNORM)
return HRESULT_FROM_WIN32( ERROR_NOT_SUPPORTED );
}
// Round to bytes
dbpp = ( dbpp + 7 ) / 8;
uint8_t *pDest = result.pixels;
if ( !pDest )
return E_POINTER;
// Promote "typeless" BC formats
DXGI_FORMAT cformat;
switch( cImage.format )
{
case DXGI_FORMAT_BC1_TYPELESS: cformat = DXGI_FORMAT_BC1_UNORM; break;
case DXGI_FORMAT_BC2_TYPELESS: cformat = DXGI_FORMAT_BC2_UNORM; break;
case DXGI_FORMAT_BC3_TYPELESS: cformat = DXGI_FORMAT_BC3_UNORM; break;
case DXGI_FORMAT_BC4_TYPELESS: cformat = DXGI_FORMAT_BC4_UNORM; break;
case DXGI_FORMAT_BC5_TYPELESS: cformat = DXGI_FORMAT_BC5_UNORM; break;
case DXGI_FORMAT_BC6H_TYPELESS: cformat = DXGI_FORMAT_BC6H_UF16; break;
case DXGI_FORMAT_BC7_TYPELESS: cformat = DXGI_FORMAT_BC7_UNORM; break;
default: cformat = cImage.format; break;
}
// Determine BC format decoder
BC_DECODE pfDecode;
size_t sbpp;
switch(cformat)
{
case DXGI_FORMAT_BC1_UNORM:
case DXGI_FORMAT_BC1_UNORM_SRGB: pfDecode = D3DXDecodeBC1; sbpp = 8; break;
case DXGI_FORMAT_BC2_UNORM:
case DXGI_FORMAT_BC2_UNORM_SRGB: pfDecode = D3DXDecodeBC2; sbpp = 16; break;
case DXGI_FORMAT_BC3_UNORM:
case DXGI_FORMAT_BC3_UNORM_SRGB: pfDecode = D3DXDecodeBC3; sbpp = 16; break;
case DXGI_FORMAT_BC4_UNORM: pfDecode = D3DXDecodeBC4U; sbpp = 8; break;
case DXGI_FORMAT_BC4_SNORM: pfDecode = D3DXDecodeBC4S; sbpp = 8; break;
case DXGI_FORMAT_BC5_UNORM: pfDecode = D3DXDecodeBC5U; sbpp = 16; break;
case DXGI_FORMAT_BC5_SNORM: pfDecode = D3DXDecodeBC5S; sbpp = 16; break;
case DXGI_FORMAT_BC6H_UF16: pfDecode = D3DXDecodeBC6HU; sbpp = 16; break;
case DXGI_FORMAT_BC6H_SF16: pfDecode = D3DXDecodeBC6HS; sbpp = 16; break;
case DXGI_FORMAT_BC7_UNORM:
case DXGI_FORMAT_BC7_UNORM_SRGB: pfDecode = D3DXDecodeBC7; sbpp = 16; break;
default:
return HRESULT_FROM_WIN32( ERROR_NOT_SUPPORTED );
}
XMVECTOR temp[16];
const uint8_t *pSrc = cImage.pixels;
const size_t rowPitch = result.rowPitch;
for( size_t h=0; h < cImage.height; h += 4 )
{
const uint8_t *sptr = pSrc;
uint8_t* dptr = pDest;
size_t ph = std::min<size_t>( 4, cImage.height - h );
size_t w = 0;
for( size_t count = 0; count < cImage.rowPitch; count += sbpp, w += 4 )
{
pfDecode( temp, sptr );
_ConvertScanline( temp, 16, format, cformat, 0 );
size_t pw = std::min<size_t>( 4, cImage.width - w );
assert( pw > 0 && ph > 0 );
if ( !_StoreScanline( dptr, rowPitch, format, &temp[0], pw ) )
return E_FAIL;
if ( ph > 1 )
{
if ( !_StoreScanline( dptr + rowPitch, rowPitch, format, &temp[4], pw ) )
return E_FAIL;
if ( ph > 2 )
{
if ( !_StoreScanline( dptr + rowPitch*2, rowPitch, format, &temp[8], pw ) )
return E_FAIL;
if ( ph > 3 )
{
if ( !_StoreScanline( dptr + rowPitch*3, rowPitch, format, &temp[12], pw ) )
return E_FAIL;
}
}
}
sptr += sbpp;
dptr += dbpp*4;
}
pSrc += cImage.rowPitch;
pDest += rowPitch*4;
}
return S_OK;
}
//-------------------------------------------------------------------------------------
bool _IsAlphaAllOpaqueBC( _In_ const Image& cImage )
{
if ( !cImage.pixels )
return false;
// Promote "typeless" BC formats
DXGI_FORMAT cformat;
switch( cImage.format )
{
case DXGI_FORMAT_BC1_TYPELESS: cformat = DXGI_FORMAT_BC1_UNORM; break;
case DXGI_FORMAT_BC2_TYPELESS: cformat = DXGI_FORMAT_BC2_UNORM; break;
case DXGI_FORMAT_BC3_TYPELESS: cformat = DXGI_FORMAT_BC3_UNORM; break;
case DXGI_FORMAT_BC7_TYPELESS: cformat = DXGI_FORMAT_BC7_UNORM; break;
default: cformat = cImage.format; break;
}
// Determine BC format decoder
BC_DECODE pfDecode;
size_t sbpp;
switch(cformat)
{
case DXGI_FORMAT_BC1_UNORM:
case DXGI_FORMAT_BC1_UNORM_SRGB: pfDecode = D3DXDecodeBC1; sbpp = 8; break;
case DXGI_FORMAT_BC2_UNORM:
case DXGI_FORMAT_BC2_UNORM_SRGB: pfDecode = D3DXDecodeBC2; sbpp = 16; break;
case DXGI_FORMAT_BC3_UNORM:
case DXGI_FORMAT_BC3_UNORM_SRGB: pfDecode = D3DXDecodeBC3; sbpp = 16; break;
case DXGI_FORMAT_BC7_UNORM:
case DXGI_FORMAT_BC7_UNORM_SRGB: pfDecode = D3DXDecodeBC7; sbpp = 16; break;
default:
// BC4, BC5, and BC6 don't have alpha channels
return false;
}
// Scan blocks for non-opaque alpha
static const XMVECTORF32 threshold = { 0.99f, 0.99f, 0.99f, 0.99f };
XMVECTOR temp[16];
const uint8_t *pPixels = cImage.pixels;
for( size_t h = 0; h < cImage.height; h += 4 )
{
const uint8_t *ptr = pPixels;
size_t ph = std::min<size_t>( 4, cImage.height - h );
size_t w = 0;
for( size_t count = 0; count < cImage.rowPitch; count += sbpp, w += 4 )
{
pfDecode( temp, ptr );
size_t pw = std::min<size_t>( 4, cImage.width - w );
assert( pw > 0 && ph > 0 );
if ( pw == 4 && ph == 4 )
{
// Full blocks
for( size_t j = 0; j < 16; ++j )
{
XMVECTOR alpha = XMVectorSplatW( temp[j] );
if ( XMVector4Less( alpha, threshold ) )
return false;
}
}
else
{
// Handle partial blocks
for( size_t y = 0; y < ph; ++y )
{
for( size_t x = 0; x < pw; ++x )
{
XMVECTOR alpha = XMVectorSplatW( temp[ y * 4 + x ] );
if ( XMVector4Less( alpha, threshold ) )
return false;
}
}
}
ptr += sbpp;
}
pPixels += cImage.rowPitch;
}
return true;
}
//=====================================================================================
// Entry-points
//=====================================================================================
//-------------------------------------------------------------------------------------
// Compression
//-------------------------------------------------------------------------------------
_Use_decl_annotations_
HRESULT Compress( const Image& srcImage, DXGI_FORMAT format, DWORD compress, float alphaRef, ScratchImage& image )
{
if ( IsCompressed(srcImage.format) || !IsCompressed(format) || IsTypeless(format) )
return E_INVALIDARG;
// Create compressed image
HRESULT hr = image.Initialize2D( format, srcImage.width, srcImage.height, 1, 1 );
if ( FAILED(hr) )
return hr;
const Image *img = image.GetImage( 0, 0, 0 );
if ( !img )
{
image.Release();
return E_POINTER;
}
// Compress single image
if (compress & TEX_COMPRESS_PARALLEL)
{
#ifndef _OPENMP
return E_NOTIMPL;
#else
hr = _CompressBC_Parallel( srcImage, *img, _GetBCFlags( compress ), alphaRef );
#endif // _OPENMP
}
else
{
hr = _CompressBC( srcImage, *img, _GetBCFlags( compress ), alphaRef );
}
if ( FAILED(hr) )
image.Release();
return hr;
}
_Use_decl_annotations_
HRESULT Compress( const Image* srcImages, size_t nimages, const TexMetadata& metadata,
DXGI_FORMAT format, DWORD compress, float alphaRef, ScratchImage& cImages )
{
if ( !srcImages || !nimages )
return E_INVALIDARG;
if ( !IsCompressed(format) || IsTypeless(format) )
return E_INVALIDARG;
cImages.Release();
TexMetadata mdata2 = metadata;
mdata2.format = format;
HRESULT hr = cImages.Initialize( mdata2 );
if ( FAILED(hr) )
return hr;
if ( nimages != cImages.GetImageCount() )
{
cImages.Release();
return E_FAIL;
}
const Image* dest = cImages.GetImages();
if ( !dest )
{
cImages.Release();
return E_POINTER;
}
for( size_t index=0; index < nimages; ++index )
{
assert( dest[ index ].format == format );
const Image& src = srcImages[ index ];
if ( src.width != dest[ index ].width || src.height != dest[ index ].height )
{
cImages.Release();
return E_FAIL;
}
if ( (compress & TEX_COMPRESS_PARALLEL) )
{
#ifndef _OPENMP
return E_NOTIMPL;
#else
if ( compress & TEX_COMPRESS_PARALLEL )
{
hr = _CompressBC_Parallel( src, dest[ index ], _GetBCFlags( compress ), alphaRef );
if ( FAILED(hr) )
{
cImages.Release();
return hr;
}
}
#endif // _OPENMP
}
else
{
hr = _CompressBC( src, dest[ index ], _GetBCFlags( compress ), alphaRef );
if ( FAILED(hr) )
{
cImages.Release();
return hr;
}
}
}
return S_OK;
}
//-------------------------------------------------------------------------------------
// Decompression
//-------------------------------------------------------------------------------------
_Use_decl_annotations_
HRESULT Decompress( const Image& cImage, DXGI_FORMAT format, ScratchImage& image )
{
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( cImage.format );
if ( format == DXGI_FORMAT_UNKNOWN )
{
// Input is not a compressed format
return E_INVALIDARG;
}
}
else if ( !IsCompressed(cImage.format) || !IsValid(format) )
return E_INVALIDARG;
// 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;
}
_Use_decl_annotations_
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;
}
}; // namespace
Reference in New Issue View Git Blame Copy Permalink