mirror of
https://github.com/microsoft/DirectXTex
synced 2024-11-23 04:50:06 +00:00
325 lines
11 KiB
C++
325 lines
11 KiB
C++
//-------------------------------------------------------------------------------------
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// DirectXTexPMAlpha.cpp
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//
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// DirectX Texture Library - Premultiplied alpha operations
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//
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// Copyright (c) Microsoft Corporation. All rights reserved.
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// Licensed under the MIT License.
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//
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// http://go.microsoft.com/fwlink/?LinkId=248926
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//-------------------------------------------------------------------------------------
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#include "DirectXTexp.h"
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using namespace DirectX;
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namespace
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{
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//---------------------------------------------------------------------------------
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// NonPremultiplied alpha -> Premultiplied alpha
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HRESULT PremultiplyAlpha_(const Image& srcImage, const Image& destImage)
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{
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assert(srcImage.width == destImage.width);
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assert(srcImage.height == destImage.height);
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ScopedAlignedArrayXMVECTOR scanline(static_cast<XMVECTOR*>(_aligned_malloc((sizeof(XMVECTOR)*srcImage.width), 16)));
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if (!scanline)
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return E_OUTOFMEMORY;
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const uint8_t *pSrc = srcImage.pixels;
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uint8_t *pDest = destImage.pixels;
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if (!pSrc || !pDest)
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return E_POINTER;
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for (size_t h = 0; h < srcImage.height; ++h)
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{
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if (!_LoadScanline(scanline.get(), srcImage.width, pSrc, srcImage.rowPitch, srcImage.format))
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return E_FAIL;
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XMVECTOR* ptr = scanline.get();
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for (size_t w = 0; w < srcImage.width; ++w)
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{
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XMVECTOR v = *ptr;
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XMVECTOR alpha = XMVectorSplatW(*ptr);
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alpha = XMVectorMultiply(v, alpha);
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*(ptr++) = XMVectorSelect(v, alpha, g_XMSelect1110);
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}
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if (!_StoreScanline(pDest, destImage.rowPitch, destImage.format, scanline.get(), srcImage.width))
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return E_FAIL;
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pSrc += srcImage.rowPitch;
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pDest += destImage.rowPitch;
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}
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return S_OK;
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}
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HRESULT PremultiplyAlphaLinear(const Image& srcImage, DWORD flags, const Image& destImage)
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{
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assert(srcImage.width == destImage.width);
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assert(srcImage.height == destImage.height);
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static_assert(static_cast<int>(TEX_PMALPHA_SRGB_IN) == static_cast<int>(TEX_FILTER_SRGB_IN), "TEX_PMALHPA_SRGB* should match TEX_FILTER_SRGB*");
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static_assert(static_cast<int>(TEX_PMALPHA_SRGB_OUT) == static_cast<int>(TEX_FILTER_SRGB_OUT), "TEX_PMALHPA_SRGB* should match TEX_FILTER_SRGB*");
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static_assert(static_cast<int>(TEX_PMALPHA_SRGB) == static_cast<int>(TEX_FILTER_SRGB), "TEX_PMALHPA_SRGB* should match TEX_FILTER_SRGB*");
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flags &= TEX_PMALPHA_SRGB;
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ScopedAlignedArrayXMVECTOR scanline(static_cast<XMVECTOR*>(_aligned_malloc((sizeof(XMVECTOR)*srcImage.width), 16)));
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if (!scanline)
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return E_OUTOFMEMORY;
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const uint8_t *pSrc = srcImage.pixels;
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uint8_t *pDest = destImage.pixels;
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if (!pSrc || !pDest)
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return E_POINTER;
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for (size_t h = 0; h < srcImage.height; ++h)
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{
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if (!_LoadScanlineLinear(scanline.get(), srcImage.width, pSrc, srcImage.rowPitch, srcImage.format, flags))
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return E_FAIL;
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XMVECTOR* ptr = scanline.get();
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for (size_t w = 0; w < srcImage.width; ++w)
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{
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XMVECTOR v = *ptr;
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XMVECTOR alpha = XMVectorSplatW(*ptr);
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alpha = XMVectorMultiply(v, alpha);
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*(ptr++) = XMVectorSelect(v, alpha, g_XMSelect1110);
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}
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if (!_StoreScanlineLinear(pDest, destImage.rowPitch, destImage.format, scanline.get(), srcImage.width, flags))
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return E_FAIL;
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pSrc += srcImage.rowPitch;
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pDest += destImage.rowPitch;
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}
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return S_OK;
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}
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//---------------------------------------------------------------------------------
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// Premultiplied alpha -> NonPremultiplied alpha (a.k.a. Straight alpha)
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HRESULT DemultiplyAlpha(const Image& srcImage, const Image& destImage)
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{
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assert(srcImage.width == destImage.width);
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assert(srcImage.height == destImage.height);
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ScopedAlignedArrayXMVECTOR scanline(static_cast<XMVECTOR*>(_aligned_malloc((sizeof(XMVECTOR)*srcImage.width), 16)));
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if (!scanline)
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return E_OUTOFMEMORY;
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const uint8_t *pSrc = srcImage.pixels;
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uint8_t *pDest = destImage.pixels;
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if (!pSrc || !pDest)
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return E_POINTER;
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for (size_t h = 0; h < srcImage.height; ++h)
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{
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if (!_LoadScanline(scanline.get(), srcImage.width, pSrc, srcImage.rowPitch, srcImage.format))
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return E_FAIL;
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XMVECTOR* ptr = scanline.get();
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for (size_t w = 0; w < srcImage.width; ++w)
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{
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XMVECTOR v = *ptr;
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XMVECTOR alpha = XMVectorSplatW(*ptr);
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alpha = XMVectorDivide(v, alpha);
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*(ptr++) = XMVectorSelect(v, alpha, g_XMSelect1110);
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}
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if (!_StoreScanline(pDest, destImage.rowPitch, destImage.format, scanline.get(), srcImage.width))
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return E_FAIL;
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pSrc += srcImage.rowPitch;
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pDest += destImage.rowPitch;
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}
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return S_OK;
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}
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HRESULT DemultiplyAlphaLinear(const Image& srcImage, DWORD flags, const Image& destImage)
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{
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assert(srcImage.width == destImage.width);
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assert(srcImage.height == destImage.height);
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static_assert(static_cast<int>(TEX_PMALPHA_SRGB_IN) == static_cast<int>(TEX_FILTER_SRGB_IN), "TEX_PMALHPA_SRGB* should match TEX_FILTER_SRGB*");
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static_assert(static_cast<int>(TEX_PMALPHA_SRGB_OUT) == static_cast<int>(TEX_FILTER_SRGB_OUT), "TEX_PMALHPA_SRGB* should match TEX_FILTER_SRGB*");
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static_assert(static_cast<int>(TEX_PMALPHA_SRGB) == static_cast<int>(TEX_FILTER_SRGB), "TEX_PMALHPA_SRGB* should match TEX_FILTER_SRGB*");
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flags &= TEX_PMALPHA_SRGB;
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ScopedAlignedArrayXMVECTOR scanline(static_cast<XMVECTOR*>(_aligned_malloc((sizeof(XMVECTOR)*srcImage.width), 16)));
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if (!scanline)
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return E_OUTOFMEMORY;
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const uint8_t *pSrc = srcImage.pixels;
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uint8_t *pDest = destImage.pixels;
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if (!pSrc || !pDest)
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return E_POINTER;
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for (size_t h = 0; h < srcImage.height; ++h)
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{
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if (!_LoadScanlineLinear(scanline.get(), srcImage.width, pSrc, srcImage.rowPitch, srcImage.format, flags))
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return E_FAIL;
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XMVECTOR* ptr = scanline.get();
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for (size_t w = 0; w < srcImage.width; ++w)
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{
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XMVECTOR v = *ptr;
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XMVECTOR alpha = XMVectorSplatW(*ptr);
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alpha = XMVectorDivide(v, alpha);
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*(ptr++) = XMVectorSelect(v, alpha, g_XMSelect1110);
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}
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if (!_StoreScanlineLinear(pDest, destImage.rowPitch, destImage.format, scanline.get(), srcImage.width, flags))
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return E_FAIL;
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pSrc += srcImage.rowPitch;
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pDest += destImage.rowPitch;
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}
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return S_OK;
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}
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}
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//=====================================================================================
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// Entry-points
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//=====================================================================================
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//-------------------------------------------------------------------------------------
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// Converts to/from a premultiplied alpha version of the texture
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//-------------------------------------------------------------------------------------
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_Use_decl_annotations_
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HRESULT DirectX::PremultiplyAlpha(
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const Image& srcImage,
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DWORD flags,
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ScratchImage& image)
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{
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if (!srcImage.pixels)
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return E_POINTER;
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if (IsCompressed(srcImage.format)
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|| IsPlanar(srcImage.format)
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|| IsPalettized(srcImage.format)
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|| IsTypeless(srcImage.format)
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|| !HasAlpha(srcImage.format))
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return HRESULT_FROM_WIN32(ERROR_NOT_SUPPORTED);
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if ((srcImage.width > UINT32_MAX) || (srcImage.height > UINT32_MAX))
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return E_INVALIDARG;
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HRESULT hr = image.Initialize2D(srcImage.format, srcImage.width, srcImage.height, 1, 1);
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if (FAILED(hr))
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return hr;
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const Image *rimage = image.GetImage(0, 0, 0);
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if (!rimage)
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{
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image.Release();
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return E_POINTER;
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}
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if (flags & TEX_PMALPHA_REVERSE)
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{
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hr = (flags & TEX_PMALPHA_IGNORE_SRGB) ? DemultiplyAlpha(srcImage, *rimage) : DemultiplyAlphaLinear(srcImage, flags, *rimage);
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}
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else
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{
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hr = (flags & TEX_PMALPHA_IGNORE_SRGB) ? PremultiplyAlpha_(srcImage, *rimage) : PremultiplyAlphaLinear(srcImage, flags, *rimage);
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}
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if (FAILED(hr))
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{
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image.Release();
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return hr;
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}
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return S_OK;
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}
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//-------------------------------------------------------------------------------------
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// Converts to/from a premultiplied alpha version of the texture (complex)
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//-------------------------------------------------------------------------------------
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_Use_decl_annotations_
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HRESULT DirectX::PremultiplyAlpha(
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const Image* srcImages,
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size_t nimages,
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const TexMetadata& metadata,
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DWORD flags,
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ScratchImage& result)
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{
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if (!srcImages || !nimages)
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return E_INVALIDARG;
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if (IsCompressed(metadata.format)
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|| IsPlanar(metadata.format)
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|| IsPalettized(metadata.format)
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|| IsTypeless(metadata.format)
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|| !HasAlpha(metadata.format))
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return HRESULT_FROM_WIN32(ERROR_NOT_SUPPORTED);
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if ((metadata.width > UINT32_MAX) || (metadata.height > UINT32_MAX))
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return E_INVALIDARG;
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if (metadata.IsPMAlpha() != ((flags & TEX_PMALPHA_REVERSE) != 0))
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return E_FAIL;
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TexMetadata mdata2 = metadata;
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mdata2.SetAlphaMode((flags & TEX_PMALPHA_REVERSE) ? TEX_ALPHA_MODE_STRAIGHT : TEX_ALPHA_MODE_PREMULTIPLIED);
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HRESULT hr = result.Initialize(mdata2);
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if (FAILED(hr))
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return hr;
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if (nimages != result.GetImageCount())
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{
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result.Release();
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return E_FAIL;
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}
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const Image* dest = result.GetImages();
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if (!dest)
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{
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result.Release();
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return E_POINTER;
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}
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for (size_t index = 0; index < nimages; ++index)
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{
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const Image& src = srcImages[index];
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if (src.format != metadata.format)
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{
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result.Release();
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return E_FAIL;
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}
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if ((src.width > UINT32_MAX) || (src.height > UINT32_MAX))
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return E_FAIL;
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const Image& dst = dest[index];
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assert(dst.format == metadata.format);
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if (src.width != dst.width || src.height != dst.height)
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{
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result.Release();
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return E_FAIL;
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}
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if (flags & TEX_PMALPHA_REVERSE)
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{
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hr = (flags & TEX_PMALPHA_IGNORE_SRGB) ? DemultiplyAlpha(src, dst) : DemultiplyAlphaLinear(src, flags, dst);
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}
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else
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{
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hr = (flags & TEX_PMALPHA_IGNORE_SRGB) ? PremultiplyAlpha_(src, dst) : PremultiplyAlphaLinear(src, flags, dst);
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}
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if (FAILED(hr))
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{
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result.Release();
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return hr;
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}
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}
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return S_OK;
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}
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