//-------------------------------------------------------------------------------------
// Converts to a premultiplied alpha version of the texture (complex)
//-------------------------------------------------------------------------------------
_Use_decl_annotations_
HRESULT PremultiplyAlpha( const Image* srcImages, size_t nimages, const TexMetadata& metadata, ScratchImage& result )
{
if ( !srcImages || !nimages )
return E_INVALIDARG;
if ( IsCompressed(metadata.format)
|| IsVideo(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 = _PremultiplyAlpha( src, dst );
if ( FAILED(hr) )
{
result.Release();
return hr;
}
}
return S_OK;
}
//-------------------------------------------------------------------------------------
// Converts to/from a premultiplied alpha version of the texture (complex)
//-------------------------------------------------------------------------------------
_Use_decl_annotations_
HRESULT DirectX::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);
if ((metadata.width > UINT32_MAX) || (metadata.height > UINT32_MAX))
return E_INVALIDARG;
if (metadata.IsPMAlpha() != ((flags & TEX_PMALPHA_REVERSE) != 0))
return E_FAIL;
TexMetadata mdata2 = metadata;
mdata2.SetAlphaMode((flags & TEX_PMALPHA_REVERSE) ? TEX_ALPHA_MODE_STRAIGHT : 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;
}
if ((src.width > UINT32_MAX) || (src.height > UINT32_MAX))
return E_FAIL;
const Image& dst = dest[index];
assert(dst.format == metadata.format);
if (src.width != dst.width || src.height != dst.height)
{
result.Release();
return E_FAIL;
}
if (flags & TEX_PMALPHA_REVERSE)
{
hr = (flags & TEX_PMALPHA_IGNORE_SRGB) ? DemultiplyAlpha(src, dst) : DemultiplyAlphaLinear(src, flags, dst);
}
else
{
hr = (flags & TEX_PMALPHA_IGNORE_SRGB) ? PremultiplyAlpha_(src, dst) : PremultiplyAlphaLinear(src, flags, dst);
}
if (FAILED(hr))
{
result.Release();
return hr;
}
}
return S_OK;
}
//-------------------------------------------------------------------------------------
// Resize image (complex)
//-------------------------------------------------------------------------------------
_Use_decl_annotations_
HRESULT DirectX::Resize(
const Image* srcImages,
size_t nimages,
const TexMetadata& metadata,
size_t width,
size_t height,
DWORD filter,
ScratchImage& result)
{
if (!srcImages || !nimages || width == 0 || height == 0)
return E_INVALIDARG;
if ((width > UINT32_MAX) || (height > UINT32_MAX))
return E_INVALIDARG;
TexMetadata mdata2 = metadata;
mdata2.width = width;
mdata2.height = height;
mdata2.mipLevels = 1;
HRESULT hr = result.Initialize(mdata2);
if (FAILED(hr))
return hr;
bool usewic = !metadata.IsPMAlpha() && UseWICFiltering(metadata.format, filter);
WICPixelFormatGUID pfGUID = { 0 };
bool wicpf = (usewic) ? _DXGIToWIC(metadata.format, pfGUID, true) : false;
switch (metadata.dimension)
{
case TEX_DIMENSION_TEXTURE1D:
case TEX_DIMENSION_TEXTURE2D:
assert(metadata.depth == 1);
for (size_t item = 0; item < metadata.arraySize; ++item)
{
size_t srcIndex = metadata.ComputeIndex(0, item, 0);
if (srcIndex >= nimages)
{
result.Release();
return E_FAIL;
}
const Image* srcimg = &srcImages[srcIndex];
const Image* destimg = result.GetImage(0, item, 0);
if (!srcimg || !destimg)
{
result.Release();
return E_POINTER;
}
if (srcimg->format != metadata.format)
{
result.Release();
return E_FAIL;
}
if ((srcimg->width > UINT32_MAX) || (srcimg->height > UINT32_MAX))
{
result.Release();
return E_FAIL;
}
if (usewic)
{
if (wicpf)
{
// Case 1: Source format is supported by Windows Imaging Component
hr = PerformResizeUsingWIC(*srcimg, filter, pfGUID, *destimg);
}
else
{
// Case 2: Source format is not supported by WIC, so we have to convert, resize, and convert back
hr = PerformResizeViaF32(*srcimg, filter, *destimg);
}
}
else
{
// Case 3: not using WIC resizing
hr = PerformResizeUsingCustomFilters(*srcimg, filter, *destimg);
}
if (FAILED(hr))
{
result.Release();
return hr;
}
}
break;
case TEX_DIMENSION_TEXTURE3D:
assert(metadata.arraySize == 1);
for (size_t slice = 0; slice < metadata.depth; ++slice)
{
size_t srcIndex = metadata.ComputeIndex(0, 0, slice);
if (srcIndex >= nimages)
{
result.Release();
return E_FAIL;
}
const Image* srcimg = &srcImages[srcIndex];
const Image* destimg = result.GetImage(0, 0, slice);
if (!srcimg || !destimg)
{
result.Release();
return E_POINTER;
}
if (srcimg->format != metadata.format)
{
result.Release();
return E_FAIL;
}
if ((srcimg->width > UINT32_MAX) || (srcimg->height > UINT32_MAX))
{
result.Release();
return E_FAIL;
}
if (usewic)
{
if (wicpf)
{
// Case 1: Source format is supported by Windows Imaging Component
hr = PerformResizeUsingWIC(*srcimg, filter, pfGUID, *destimg);
}
else
{
// Case 2: Source format is not supported by WIC, so we have to convert, resize, and convert back
hr = PerformResizeViaF32(*srcimg, filter, *destimg);
}
}
else
{
// Case 3: not using WIC resizing
hr = PerformResizeUsingCustomFilters(*srcimg, filter, *destimg);
}
if (FAILED(hr))
{
result.Release();
return hr;
}
}
break;
default:
result.Release();
return E_FAIL;
}
return S_OK;
}
