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//-------------------------------------------------------------------------------------
// DirectXTexPMAlpha.cpp
//
// DirectX Texture Library - Premultiplied alpha operations
//
// 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"
namespace DirectX
{
static HRESULT _PremultiplyAlpha( _In_ const Image& srcImage, _In_ const Image& destImage )
{
assert( srcImage.width == destImage.width );
assert( srcImage.height == destImage.height );
ScopedAlignedArrayXMVECTOR scanline( reinterpret_cast<XMVECTOR*>( _aligned_malloc( (sizeof(XMVECTOR)*srcImage.width), 16 ) ) );
if ( !scanline )
return E_OUTOFMEMORY;
const uint8_t *pSrc = srcImage.pixels;
uint8_t *pDest = destImage.pixels;
if ( !pSrc || !pDest )
return E_POINTER;
for( size_t h = 0; h < srcImage.height; ++h )
{
if ( !_LoadScanline( scanline.get(), srcImage.width, pSrc, srcImage.rowPitch, srcImage.format ) )
return E_FAIL;
XMVECTOR* ptr = scanline.get();
for( size_t w = 0; w < srcImage.width; ++w )
{
XMVECTOR v = *ptr;
XMVECTOR alpha = XMVectorSplatW( *ptr );
alpha = XMVectorMultiply( v, alpha );
*(ptr++) = XMVectorSelect( v, alpha, g_XMSelect1110 );
}
if ( !_StoreScanline( pDest, destImage.rowPitch, destImage.format, scanline.get(), srcImage.width ) )
return E_FAIL;
pSrc += srcImage.rowPitch;
pDest += destImage.rowPitch;
}
return S_OK;
}
static HRESULT _PremultiplyAlphaLinear( _In_ const Image& srcImage, _In_ DWORD flags, _In_ const Image& destImage )
{
assert( srcImage.width == destImage.width );
assert( srcImage.height == destImage.height );
static_assert( TEX_PMALPHA_SRGB_IN == TEX_FILTER_SRGB_IN, "TEX_PMALHPA_SRGB* should match TEX_FILTER_SRGB*" );
static_assert( TEX_PMALPHA_SRGB_OUT == TEX_FILTER_SRGB_OUT, "TEX_PMALHPA_SRGB* should match TEX_FILTER_SRGB*" );
static_assert( TEX_PMALPHA_SRGB == TEX_FILTER_SRGB, "TEX_PMALHPA_SRGB* should match TEX_FILTER_SRGB*" );
flags &= TEX_PMALPHA_SRGB;
ScopedAlignedArrayXMVECTOR scanline( reinterpret_cast<XMVECTOR*>( _aligned_malloc( (sizeof(XMVECTOR)*srcImage.width), 16 ) ) );
if ( !scanline )
return E_OUTOFMEMORY;
const uint8_t *pSrc = srcImage.pixels;
uint8_t *pDest = destImage.pixels;
if ( !pSrc || !pDest )
return E_POINTER;
for( size_t h = 0; h < srcImage.height; ++h )
{
if ( !_LoadScanlineLinear( scanline.get(), srcImage.width, pSrc, srcImage.rowPitch, srcImage.format, flags ) )
return E_FAIL;
XMVECTOR* ptr = scanline.get();
for( size_t w = 0; w < srcImage.width; ++w )
{
XMVECTOR v = *ptr;
XMVECTOR alpha = XMVectorSplatW( *ptr );
alpha = XMVectorMultiply( v, alpha );
*(ptr++) = XMVectorSelect( v, alpha, g_XMSelect1110 );
}
if ( !_StoreScanlineLinear( pDest, destImage.rowPitch, destImage.format, scanline.get(), srcImage.width, flags ) )
return E_FAIL;
pSrc += srcImage.rowPitch;
pDest += destImage.rowPitch;
}
return S_OK;
}
//=====================================================================================
// Entry-points
//=====================================================================================
//-------------------------------------------------------------------------------------
// Converts to a premultiplied alpha version of the texture
//-------------------------------------------------------------------------------------
_Use_decl_annotations_
HRESULT PremultiplyAlpha( const Image& srcImage, DWORD flags, ScratchImage& image )
{
if ( !srcImage.pixels )
return E_POINTER;
if ( IsCompressed(srcImage.format)
|| IsPlanar(srcImage.format)
|| IsPalettized(srcImage.format)
|| IsTypeless(srcImage.format)
|| !HasAlpha(srcImage.format) )
return HRESULT_FROM_WIN32( ERROR_NOT_SUPPORTED );
#ifdef _M_X64
if ( (srcImage.width > 0xFFFFFFFF) || (srcImage.height > 0xFFFFFFFF) )
return E_INVALIDARG;
#endif
HRESULT hr = image.Initialize2D( srcImage.format, srcImage.width, srcImage.height, 1, 1 );
if ( FAILED(hr) )
return hr;
const Image *rimage = image.GetImage( 0, 0, 0 );
if ( !rimage )
{
image.Release();
return E_POINTER;
}
hr = ( flags & TEX_PMALPHA_IGNORE_SRGB ) ? _PremultiplyAlpha( srcImage, *rimage ) : _PremultiplyAlphaLinear( srcImage, flags, *rimage );
if ( FAILED(hr) )
{
image.Release();
return hr;
}
return S_OK;
}
//-------------------------------------------------------------------------------------
// Converts to a premultiplied alpha version of the texture (complex)
//-------------------------------------------------------------------------------------
_Use_decl_annotations_
HRESULT PremultiplyAlpha( const Image* srcImages, size_t nimages, const TexMetadata& metadata, DWORD flags, ScratchImage& result )
{
if ( !srcImages || !nimages )
return E_INVALIDARG;
if ( IsCompressed(metadata.format)
|| IsPlanar(metadata.format)
|| IsPalettized(metadata.format)
|| IsTypeless(metadata.format)
|| !HasAlpha(metadata.format) )
return HRESULT_FROM_WIN32( ERROR_NOT_SUPPORTED );
#ifdef _M_X64
if ( (metadata.width > 0xFFFFFFFF) || (metadata.height > 0xFFFFFFFF) )
return E_INVALIDARG;
#endif
if ( metadata.IsPMAlpha() )
{
// Already premultiplied
return E_FAIL;
}
TexMetadata mdata2 = metadata;
mdata2.SetAlphaMode(TEX_ALPHA_MODE_PREMULTIPLIED);
HRESULT hr = result.Initialize( mdata2 );
if ( FAILED(hr) )
return hr;
if ( nimages != result.GetImageCount() )
{
result.Release();
return E_FAIL;
}
const Image* dest = result.GetImages();
if ( !dest )
{
result.Release();
return E_POINTER;
}
for( size_t index=0; index < nimages; ++index )
{
const Image& src = srcImages[ index ];
if ( src.format != metadata.format )
{
result.Release();
return E_FAIL;
}
#ifdef _M_X64
if ( (src.width > 0xFFFFFFFF) || (src.height > 0xFFFFFFFF) )
return E_FAIL;
#endif
const Image& dst = dest[ index ];
assert( dst.format == metadata.format );
if ( src.width != dst.width || src.height != dst.height )
{
result.Release();
return E_FAIL;
}
hr = ( flags & TEX_PMALPHA_IGNORE_SRGB ) ? _PremultiplyAlpha( src, dst ) : _PremultiplyAlphaLinear( src, flags, dst );
if ( FAILED(hr) )
{
result.Release();
return hr;
}
}
return S_OK;
}
}; // namespace
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