src/ports/SkImageDecoder_WIC.cpp - platform/external/skia - Gitiles


 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */

 #include "SkTypes.h"

 // Workaround for:
 // http://connect.microsoft.com/VisualStudio/feedback/details/621653/
 // http://crbug.com/225822
 // In VS2010 both intsafe.h and stdint.h define the following without guards.
 // SkTypes brought in windows.h and stdint.h and the following defines are
 // not used by this file. However, they may be re-introduced by wincodec.h.
 #undef INT8_MIN
 #undef INT16_MIN
 #undef INT32_MIN
 #undef INT64_MIN
 #undef INT8_MAX
 #undef UINT8_MAX
 #undef INT16_MAX
 #undef UINT16_MAX
 #undef INT32_MAX
 #undef UINT32_MAX
 #undef INT64_MAX
 #undef UINT64_MAX

 #include <wincodec.h>
 #include "SkAutoCoInitialize.h"
 #include "SkImageDecoder.h"
 #include "SkImageEncoder.h"
 #include "SkIStream.h"
 #include "SkMovie.h"
 #include "SkStream.h"
 #include "SkTScopedComPtr.h"
 #include "SkUnPreMultiply.h"

 //All Windows SDKs back to XPSP2 export the CLSID_WICImagingFactory symbol.
 //In the Windows8 SDK the CLSID_WICImagingFactory symbol is still exported
 //but CLSID_WICImagingFactory is then #defined to CLSID_WICImagingFactory2.
 //Undo this #define if it has been done so that we link against the symbols
 //we intended to link against on all SDKs.
 #if defined(CLSID_WICImagingFactory)
 #undef CLSID_WICImagingFactory
 #endif

 class SkImageDecoder_WIC : public SkImageDecoder {
 public:
     // Decoding modes corresponding to SkImageDecoder::Mode, plus an extra mode for decoding
     // only the format.
     enum WICModes {
         kDecodeFormat_WICMode,
         kDecodeBounds_WICMode,
         kDecodePixels_WICMode,
     };

     /**
      *  Helper function to decode an SkStream.
      *  @param stream SkStream to decode. Must be at the beginning.
      *  @param bm   SkBitmap to decode into. Only used if wicMode is kDecodeBounds_WICMode or
      *      kDecodePixels_WICMode, in which case it must not be NULL.
      *  @param format Out parameter for the SkImageDecoder::Format of the SkStream. Only used if
      *      wicMode is kDecodeFormat_WICMode.
      */
     bool decodeStream(SkStream* stream, SkBitmap* bm, WICModes wicMode, Format* format) const;

 protected:
     Result onDecode(SkStream* stream, SkBitmap* bm, Mode mode) override;
 };

 struct FormatConversion {
     GUID                    fGuidFormat;
     SkImageDecoder::Format  fFormat;
 };

 static const FormatConversion gFormatConversions[] = {
     { GUID_ContainerFormatBmp, SkImageDecoder::kBMP_Format },
     { GUID_ContainerFormatGif, SkImageDecoder::kGIF_Format },
     { GUID_ContainerFormatIco, SkImageDecoder::kICO_Format },
     { GUID_ContainerFormatJpeg, SkImageDecoder::kJPEG_Format },
     { GUID_ContainerFormatPng, SkImageDecoder::kPNG_Format },
 };

 static SkImageDecoder::Format GuidContainerFormat_to_Format(REFGUID guid) {
     for (size_t i = 0; i < SK_ARRAY_COUNT(gFormatConversions); i++) {
         if (IsEqualGUID(guid, gFormatConversions[i].fGuidFormat)) {
             return gFormatConversions[i].fFormat;
         }
     }
     return SkImageDecoder::kUnknown_Format;
 }

 SkImageDecoder::Result SkImageDecoder_WIC::onDecode(SkStream* stream, SkBitmap* bm, Mode mode) {
     WICModes wicMode;
     switch (mode) {
         case SkImageDecoder::kDecodeBounds_Mode:
             wicMode = kDecodeBounds_WICMode;
             break;
         case SkImageDecoder::kDecodePixels_Mode:
             wicMode = kDecodePixels_WICMode;
             break;
     }
     return this->decodeStream(stream, bm, wicMode, NULL) ? kSuccess : kFailure;
 }

 bool SkImageDecoder_WIC::decodeStream(SkStream* stream, SkBitmap* bm, WICModes wicMode,
                                       Format* format) const {
     //Initialize COM.
     SkAutoCoInitialize scopedCo;
     if (!scopedCo.succeeded()) {
         return false;
     }

     HRESULT hr = S_OK;

     //Create Windows Imaging Component ImagingFactory.
     SkTScopedComPtr<IWICImagingFactory> piImagingFactory;
     if (SUCCEEDED(hr)) {
         hr = CoCreateInstance(
             CLSID_WICImagingFactory
             , NULL
             , CLSCTX_INPROC_SERVER
             , IID_PPV_ARGS(&piImagingFactory)
         );
     }

     //Convert SkStream to IStream.
     SkTScopedComPtr<IStream> piStream;
     if (SUCCEEDED(hr)) {
         hr = SkIStream::CreateFromSkStream(stream, false, &piStream);
     }

     //Make sure we're at the beginning of the stream.
     if (SUCCEEDED(hr)) {
         LARGE_INTEGER liBeginning = { 0 };
         hr = piStream->Seek(liBeginning, STREAM_SEEK_SET, NULL);
     }

     //Create the decoder from the stream content.
     SkTScopedComPtr<IWICBitmapDecoder> piBitmapDecoder;
     if (SUCCEEDED(hr)) {
         hr = piImagingFactory->CreateDecoderFromStream(
             piStream.get()                    //Image to be decoded
             , NULL                            //No particular vendor
             , WICDecodeMetadataCacheOnDemand  //Cache metadata when needed
             , &piBitmapDecoder                //Pointer to the decoder
         );
     }

     if (kDecodeFormat_WICMode == wicMode) {
         SkASSERT(format != NULL);
         //Get the format
         if (SUCCEEDED(hr)) {
             GUID guidFormat;
             hr = piBitmapDecoder->GetContainerFormat(&guidFormat);
             if (SUCCEEDED(hr)) {
                 *format = GuidContainerFormat_to_Format(guidFormat);
                 return true;
             }
         }
         return false;
     }

     //Get the first frame from the decoder.
     SkTScopedComPtr<IWICBitmapFrameDecode> piBitmapFrameDecode;
     if (SUCCEEDED(hr)) {
         hr = piBitmapDecoder->GetFrame(0, &piBitmapFrameDecode);
     }

     //Get the BitmapSource interface of the frame.
     SkTScopedComPtr<IWICBitmapSource> piBitmapSourceOriginal;
     if (SUCCEEDED(hr)) {
         hr = piBitmapFrameDecode->QueryInterface(
             IID_PPV_ARGS(&piBitmapSourceOriginal)
         );
     }

     //Get the size of the bitmap.
     UINT width;
     UINT height;
     if (SUCCEEDED(hr)) {
         hr = piBitmapSourceOriginal->GetSize(&width, &height);
     }

     //Exit early if we're only looking for the bitmap bounds.
     if (SUCCEEDED(hr)) {
         bm->setInfo(SkImageInfo::MakeN32Premul(width, height));
         if (kDecodeBounds_WICMode == wicMode) {
             return true;
         }
         if (!this->allocPixelRef(bm, NULL)) {
             return false;
         }
     }

     //Create a format converter.
     SkTScopedComPtr<IWICFormatConverter> piFormatConverter;
     if (SUCCEEDED(hr)) {
         hr = piImagingFactory->CreateFormatConverter(&piFormatConverter);
     }

     GUID destinationPixelFormat;
     if (this->getRequireUnpremultipliedColors()) {
         destinationPixelFormat = GUID_WICPixelFormat32bppBGRA;
     } else {
         destinationPixelFormat = GUID_WICPixelFormat32bppPBGRA;
     }

     if (SUCCEEDED(hr)) {
         hr = piFormatConverter->Initialize(
             piBitmapSourceOriginal.get()      //Input bitmap to convert
             , destinationPixelFormat          //Destination pixel format
             , WICBitmapDitherTypeNone         //Specified dither patterm
             , NULL                            //Specify a particular palette
             , 0.f                             //Alpha threshold
             , WICBitmapPaletteTypeCustom      //Palette translation type
         );
     }

     //Get the BitmapSource interface of the format converter.
     SkTScopedComPtr<IWICBitmapSource> piBitmapSourceConverted;
     if (SUCCEEDED(hr)) {
         hr = piFormatConverter->QueryInterface(
             IID_PPV_ARGS(&piBitmapSourceConverted)
         );
     }

     //Copy the pixels into the bitmap.
     if (SUCCEEDED(hr)) {
         SkAutoLockPixels alp(*bm);
         bm->eraseColor(SK_ColorTRANSPARENT);
         const UINT stride = (UINT) bm->rowBytes();
         hr = piBitmapSourceConverted->CopyPixels(
             NULL,                             //Get all the pixels
             stride,
             stride * height,
             reinterpret_cast<BYTE *>(bm->getPixels())
         );

         // Note: we don't need to premultiply here since we specified PBGRA
         if (SkBitmap::ComputeIsOpaque(*bm)) {
             bm->setAlphaType(kOpaque_SkAlphaType);
         }
     }

     return SUCCEEDED(hr);
 }

 /////////////////////////////////////////////////////////////////////////

 extern SkImageDecoder* image_decoder_from_stream(SkStreamRewindable*);

 SkImageDecoder* SkImageDecoder::Factory(SkStreamRewindable* stream) {
     SkImageDecoder* decoder = image_decoder_from_stream(stream);
     if (NULL == decoder) {
         // If no image decoder specific to the stream exists, use SkImageDecoder_WIC.
         return SkNEW(SkImageDecoder_WIC);
     } else {
         return decoder;
     }
 }

 /////////////////////////////////////////////////////////////////////////

 SkMovie* SkMovie::DecodeStream(SkStreamRewindable* stream) {
     return NULL;
 }

 /////////////////////////////////////////////////////////////////////////

 class SkImageEncoder_WIC : public SkImageEncoder {
 public:
     SkImageEncoder_WIC(Type t) : fType(t) {}

 protected:
     virtual bool onEncode(SkWStream* stream, const SkBitmap& bm, int quality);

 private:
     Type fType;
 };

 bool SkImageEncoder_WIC::onEncode(SkWStream* stream
                                 , const SkBitmap& bitmapOrig
                                 , int quality)
 {
     GUID type;
     switch (fType) {
         case kBMP_Type:
             type = GUID_ContainerFormatBmp;
             break;
         case kICO_Type:
             type = GUID_ContainerFormatIco;
             break;
         case kJPEG_Type:
             type = GUID_ContainerFormatJpeg;
             break;
         case kPNG_Type:
             type = GUID_ContainerFormatPng;
             break;
         default:
             return false;
     }

     //Convert to 8888 if needed.
     const SkBitmap* bitmap;
     SkBitmap bitmapCopy;
     if (kN32_SkColorType == bitmapOrig.colorType() && bitmapOrig.isOpaque()) {
         bitmap = &bitmapOrig;
     } else {
         if (!bitmapOrig.copyTo(&bitmapCopy, kN32_SkColorType)) {
             return false;
         }
         bitmap = &bitmapCopy;
     }

     // We cannot use PBGRA so we need to unpremultiply ourselves
     if (!bitmap->isOpaque()) {
         SkAutoLockPixels alp(*bitmap);

         uint8_t* pixels = reinterpret_cast<uint8_t*>(bitmap->getPixels());
         for (int y = 0; y < bitmap->height(); ++y) {
             for (int x = 0; x < bitmap->width(); ++x) {
                 uint8_t* bytes = pixels + y * bitmap->rowBytes() + x * bitmap->bytesPerPixel();

                 SkPMColor* src = reinterpret_cast<SkPMColor*>(bytes);
                 SkColor* dst = reinterpret_cast<SkColor*>(bytes);

                 *dst = SkUnPreMultiply::PMColorToColor(*src);
             }
         }
     }

     //Initialize COM.
     SkAutoCoInitialize scopedCo;
     if (!scopedCo.succeeded()) {
         return false;
     }

     HRESULT hr = S_OK;

     //Create Windows Imaging Component ImagingFactory.
     SkTScopedComPtr<IWICImagingFactory> piImagingFactory;
     if (SUCCEEDED(hr)) {
         hr = CoCreateInstance(
             CLSID_WICImagingFactory
             , NULL
             , CLSCTX_INPROC_SERVER
             , IID_PPV_ARGS(&piImagingFactory)
         );
     }

     //Convert the SkWStream to an IStream.
     SkTScopedComPtr<IStream> piStream;
     if (SUCCEEDED(hr)) {
         hr = SkWIStream::CreateFromSkWStream(stream, &piStream);
     }

     //Create an encode of the appropriate type.
     SkTScopedComPtr<IWICBitmapEncoder> piEncoder;
     if (SUCCEEDED(hr)) {
         hr = piImagingFactory->CreateEncoder(type, NULL, &piEncoder);
     }

     if (SUCCEEDED(hr)) {
         hr = piEncoder->Initialize(piStream.get(), WICBitmapEncoderNoCache);
     }

     //Create a the frame.
     SkTScopedComPtr<IWICBitmapFrameEncode> piBitmapFrameEncode;
     SkTScopedComPtr<IPropertyBag2> piPropertybag;
     if (SUCCEEDED(hr)) {
         hr = piEncoder->CreateNewFrame(&piBitmapFrameEncode, &piPropertybag);
     }

     if (SUCCEEDED(hr)) {
         PROPBAG2 name = { 0 };
         name.dwType = PROPBAG2_TYPE_DATA;
         name.vt = VT_R4;
         name.pstrName = L"ImageQuality";

         VARIANT value;
         VariantInit(&value);
         value.vt = VT_R4;
         value.fltVal = (FLOAT)(quality / 100.0);

         //Ignore result code.
         //  This returns E_FAIL if the named property is not in the bag.
         //TODO(bungeman) enumerate the properties,
         //  write and set hr iff property exists.
         piPropertybag->Write(1, &name, &value);
     }
     if (SUCCEEDED(hr)) {
         hr = piBitmapFrameEncode->Initialize(piPropertybag.get());
     }

     //Set the size of the frame.
     const UINT width = bitmap->width();
     const UINT height = bitmap->height();
     if (SUCCEEDED(hr)) {
         hr = piBitmapFrameEncode->SetSize(width, height);
     }

     //Set the pixel format of the frame.
     const WICPixelFormatGUID formatDesired = GUID_WICPixelFormat32bppBGRA;
     WICPixelFormatGUID formatGUID = formatDesired;
     if (SUCCEEDED(hr)) {
         hr = piBitmapFrameEncode->SetPixelFormat(&formatGUID);
     }
     if (SUCCEEDED(hr)) {
         //Be sure the image format is the one requested.
         hr = IsEqualGUID(formatGUID, formatDesired) ? S_OK : E_FAIL;
     }

     //Write the pixels into the frame.
     if (SUCCEEDED(hr)) {
         SkAutoLockPixels alp(*bitmap);
         const UINT stride = (UINT) bitmap->rowBytes();
         hr = piBitmapFrameEncode->WritePixels(
             height
             , stride
             , stride * height
             , reinterpret_cast<BYTE*>(bitmap->getPixels()));
     }

     if (SUCCEEDED(hr)) {
         hr = piBitmapFrameEncode->Commit();
     }

     if (SUCCEEDED(hr)) {
         hr = piEncoder->Commit();
     }

     return SUCCEEDED(hr);
 }

 ///////////////////////////////////////////////////////////////////////////////

 static SkImageEncoder* sk_imageencoder_wic_factory(SkImageEncoder::Type t) {
     switch (t) {
         case SkImageEncoder::kBMP_Type:
         case SkImageEncoder::kICO_Type:
         case SkImageEncoder::kJPEG_Type:
         case SkImageEncoder::kPNG_Type:
             break;
         default:
             return NULL;
     }
     return SkNEW_ARGS(SkImageEncoder_WIC, (t));
 }

 static SkImageEncoder_EncodeReg gEReg(sk_imageencoder_wic_factory);

 static SkImageDecoder::Format get_format_wic(SkStreamRewindable* stream) {
     SkImageDecoder::Format format;
     SkImageDecoder_WIC codec;
     if (!codec.decodeStream(stream, NULL, SkImageDecoder_WIC::kDecodeFormat_WICMode, &format)) {
         format = SkImageDecoder::kUnknown_Format;
     }
     return format;
 }

 static SkImageDecoder_FormatReg gFormatReg(get_format_wic);

	/*
	* Copyright 2011 Google Inc.
	*
	* Use of this source code is governed by a BSD-style license that can be
	* found in the LICENSE file.
	*/

	#include "SkTypes.h"

	// Workaround for:
	// http://connect.microsoft.com/VisualStudio/feedback/details/621653/
	// http://crbug.com/225822
	// In VS2010 both intsafe.h and stdint.h define the following without guards.
	// SkTypes brought in windows.h and stdint.h and the following defines are
	// not used by this file. However, they may be re-introduced by wincodec.h.
	#undef INT8_MIN
	#undef INT16_MIN
	#undef INT32_MIN
	#undef INT64_MIN
	#undef INT8_MAX
	#undef UINT8_MAX
	#undef INT16_MAX
	#undef UINT16_MAX
	#undef INT32_MAX
	#undef UINT32_MAX
	#undef INT64_MAX
	#undef UINT64_MAX

	#include <wincodec.h>
	#include "SkAutoCoInitialize.h"
	#include "SkImageDecoder.h"
	#include "SkImageEncoder.h"
	#include "SkIStream.h"
	#include "SkMovie.h"
	#include "SkStream.h"
	#include "SkTScopedComPtr.h"
	#include "SkUnPreMultiply.h"

	//All Windows SDKs back to XPSP2 export the CLSID_WICImagingFactory symbol.
	//In the Windows8 SDK the CLSID_WICImagingFactory symbol is still exported
	//but CLSID_WICImagingFactory is then #defined to CLSID_WICImagingFactory2.
	//Undo this #define if it has been done so that we link against the symbols
	//we intended to link against on all SDKs.
	#if defined(CLSID_WICImagingFactory)
	#undef CLSID_WICImagingFactory
	#endif

	class SkImageDecoder_WIC : public SkImageDecoder {
	public:
	// Decoding modes corresponding to SkImageDecoder::Mode, plus an extra mode for decoding
	// only the format.
	enum WICModes {
	kDecodeFormat_WICMode,
	kDecodeBounds_WICMode,
	kDecodePixels_WICMode,
	};

	/**
	* Helper function to decode an SkStream.
	* @param stream SkStream to decode. Must be at the beginning.
	* @param bm SkBitmap to decode into. Only used if wicMode is kDecodeBounds_WICMode or
	* kDecodePixels_WICMode, in which case it must not be NULL.
	* @param format Out parameter for the SkImageDecoder::Format of the SkStream. Only used if
	* wicMode is kDecodeFormat_WICMode.
	*/
	bool decodeStream(SkStream* stream, SkBitmap* bm, WICModes wicMode, Format* format) const;

	protected:
	Result onDecode(SkStream* stream, SkBitmap* bm, Mode mode) override;
	};

	struct FormatConversion {
	GUID fGuidFormat;
	SkImageDecoder::Format fFormat;
	};

	static const FormatConversion gFormatConversions[] = {
	{ GUID_ContainerFormatBmp, SkImageDecoder::kBMP_Format },
	{ GUID_ContainerFormatGif, SkImageDecoder::kGIF_Format },
	{ GUID_ContainerFormatIco, SkImageDecoder::kICO_Format },
	{ GUID_ContainerFormatJpeg, SkImageDecoder::kJPEG_Format },
	{ GUID_ContainerFormatPng, SkImageDecoder::kPNG_Format },
	};

	static SkImageDecoder::Format GuidContainerFormat_to_Format(REFGUID guid) {
	for (size_t i = 0; i < SK_ARRAY_COUNT(gFormatConversions); i++) {
	if (IsEqualGUID(guid, gFormatConversions[i].fGuidFormat)) {
	return gFormatConversions[i].fFormat;
	}
	}
	return SkImageDecoder::kUnknown_Format;
	}

	SkImageDecoder::Result SkImageDecoder_WIC::onDecode(SkStream* stream, SkBitmap* bm, Mode mode) {
	WICModes wicMode;
	switch (mode) {
	case SkImageDecoder::kDecodeBounds_Mode:
	wicMode = kDecodeBounds_WICMode;
	break;
	case SkImageDecoder::kDecodePixels_Mode:
	wicMode = kDecodePixels_WICMode;
	break;
	}
	return this->decodeStream(stream, bm, wicMode, NULL) ? kSuccess : kFailure;
	}

	bool SkImageDecoder_WIC::decodeStream(SkStream* stream, SkBitmap* bm, WICModes wicMode,
	Format* format) const {
	//Initialize COM.
	SkAutoCoInitialize scopedCo;
	if (!scopedCo.succeeded()) {
	return false;
	}

	HRESULT hr = S_OK;

	//Create Windows Imaging Component ImagingFactory.
	SkTScopedComPtr<IWICImagingFactory> piImagingFactory;
	if (SUCCEEDED(hr)) {
	hr = CoCreateInstance(
	CLSID_WICImagingFactory
	, NULL
	, CLSCTX_INPROC_SERVER
	, IID_PPV_ARGS(&piImagingFactory)
	);
	}

	//Convert SkStream to IStream.
	SkTScopedComPtr<IStream> piStream;
	if (SUCCEEDED(hr)) {
	hr = SkIStream::CreateFromSkStream(stream, false, &piStream);
	}

	//Make sure we're at the beginning of the stream.
	if (SUCCEEDED(hr)) {
	LARGE_INTEGER liBeginning = { 0 };
	hr = piStream->Seek(liBeginning, STREAM_SEEK_SET, NULL);
	}

	//Create the decoder from the stream content.
	SkTScopedComPtr<IWICBitmapDecoder> piBitmapDecoder;
	if (SUCCEEDED(hr)) {
	hr = piImagingFactory->CreateDecoderFromStream(
	piStream.get() //Image to be decoded
	, NULL //No particular vendor
	, WICDecodeMetadataCacheOnDemand //Cache metadata when needed
	, &piBitmapDecoder //Pointer to the decoder
	);
	}

	if (kDecodeFormat_WICMode == wicMode) {
	SkASSERT(format != NULL);
	//Get the format
	if (SUCCEEDED(hr)) {
	GUID guidFormat;
	hr = piBitmapDecoder->GetContainerFormat(&guidFormat);
	if (SUCCEEDED(hr)) {
	*format = GuidContainerFormat_to_Format(guidFormat);
	return true;
	}
	}
	return false;
	}

	//Get the first frame from the decoder.
	SkTScopedComPtr<IWICBitmapFrameDecode> piBitmapFrameDecode;
	if (SUCCEEDED(hr)) {
	hr = piBitmapDecoder->GetFrame(0, &piBitmapFrameDecode);
	}

	//Get the BitmapSource interface of the frame.
	SkTScopedComPtr<IWICBitmapSource> piBitmapSourceOriginal;
	if (SUCCEEDED(hr)) {
	hr = piBitmapFrameDecode->QueryInterface(
	IID_PPV_ARGS(&piBitmapSourceOriginal)
	);
	}

	//Get the size of the bitmap.
	UINT width;
	UINT height;
	if (SUCCEEDED(hr)) {
	hr = piBitmapSourceOriginal->GetSize(&width, &height);
	}

	//Exit early if we're only looking for the bitmap bounds.
	if (SUCCEEDED(hr)) {
	bm->setInfo(SkImageInfo::MakeN32Premul(width, height));
	if (kDecodeBounds_WICMode == wicMode) {
	return true;
	}
	if (!this->allocPixelRef(bm, NULL)) {
	return false;
	}
	}

	//Create a format converter.
	SkTScopedComPtr<IWICFormatConverter> piFormatConverter;
	if (SUCCEEDED(hr)) {
	hr = piImagingFactory->CreateFormatConverter(&piFormatConverter);
	}

	GUID destinationPixelFormat;
	if (this->getRequireUnpremultipliedColors()) {
	destinationPixelFormat = GUID_WICPixelFormat32bppBGRA;
	} else {
	destinationPixelFormat = GUID_WICPixelFormat32bppPBGRA;
	}

	if (SUCCEEDED(hr)) {
	hr = piFormatConverter->Initialize(
	piBitmapSourceOriginal.get() //Input bitmap to convert
	, destinationPixelFormat //Destination pixel format
	, WICBitmapDitherTypeNone //Specified dither patterm
	, NULL //Specify a particular palette
	, 0.f //Alpha threshold
	, WICBitmapPaletteTypeCustom //Palette translation type
	);
	}

	//Get the BitmapSource interface of the format converter.
	SkTScopedComPtr<IWICBitmapSource> piBitmapSourceConverted;
	if (SUCCEEDED(hr)) {
	hr = piFormatConverter->QueryInterface(
	IID_PPV_ARGS(&piBitmapSourceConverted)
	);
	}

	//Copy the pixels into the bitmap.
	if (SUCCEEDED(hr)) {
	SkAutoLockPixels alp(*bm);
	bm->eraseColor(SK_ColorTRANSPARENT);
	const UINT stride = (UINT) bm->rowBytes();
	hr = piBitmapSourceConverted->CopyPixels(
	NULL, //Get all the pixels
	stride,
	stride * height,
	reinterpret_cast<BYTE *>(bm->getPixels())
	);

	// Note: we don't need to premultiply here since we specified PBGRA
	if (SkBitmap::ComputeIsOpaque(*bm)) {
	bm->setAlphaType(kOpaque_SkAlphaType);
	}
	}

	return SUCCEEDED(hr);
	}

	/////////////////////////////////////////////////////////////////////////

	extern SkImageDecoder* image_decoder_from_stream(SkStreamRewindable*);

	SkImageDecoder* SkImageDecoder::Factory(SkStreamRewindable* stream) {
	SkImageDecoder* decoder = image_decoder_from_stream(stream);
	if (NULL == decoder) {
	// If no image decoder specific to the stream exists, use SkImageDecoder_WIC.
	return SkNEW(SkImageDecoder_WIC);
	} else {
	return decoder;
	}
	}

	/////////////////////////////////////////////////////////////////////////

	SkMovie* SkMovie::DecodeStream(SkStreamRewindable* stream) {
	return NULL;
	}

	/////////////////////////////////////////////////////////////////////////

	class SkImageEncoder_WIC : public SkImageEncoder {
	public:
	SkImageEncoder_WIC(Type t) : fType(t) {}

	protected:
	virtual bool onEncode(SkWStream* stream, const SkBitmap& bm, int quality);

	private:
	Type fType;
	};

	bool SkImageEncoder_WIC::onEncode(SkWStream* stream
	, const SkBitmap& bitmapOrig
	, int quality)
	{
	GUID type;
	switch (fType) {
	case kBMP_Type:
	type = GUID_ContainerFormatBmp;
	break;
	case kICO_Type:
	type = GUID_ContainerFormatIco;
	break;
	case kJPEG_Type:
	type = GUID_ContainerFormatJpeg;
	break;
	case kPNG_Type:
	type = GUID_ContainerFormatPng;
	break;
	default:
	return false;
	}

	//Convert to 8888 if needed.
	const SkBitmap* bitmap;
	SkBitmap bitmapCopy;
	if (kN32_SkColorType == bitmapOrig.colorType() && bitmapOrig.isOpaque()) {
	bitmap = &bitmapOrig;
	} else {
	if (!bitmapOrig.copyTo(&bitmapCopy, kN32_SkColorType)) {
	return false;
	}
	bitmap = &bitmapCopy;
	}

	// We cannot use PBGRA so we need to unpremultiply ourselves
	if (!bitmap->isOpaque()) {
	SkAutoLockPixels alp(*bitmap);

	uint8_t* pixels = reinterpret_cast<uint8_t*>(bitmap->getPixels());
	for (int y = 0; y < bitmap->height(); ++y) {
	for (int x = 0; x < bitmap->width(); ++x) {
	uint8_t* bytes = pixels + y * bitmap->rowBytes() + x * bitmap->bytesPerPixel();

	SkPMColor* src = reinterpret_cast<SkPMColor*>(bytes);
	SkColor* dst = reinterpret_cast<SkColor*>(bytes);

	dst = SkUnPreMultiply::PMColorToColor(src);
	}
	}
	}

	//Initialize COM.
	SkAutoCoInitialize scopedCo;
	if (!scopedCo.succeeded()) {
	return false;
	}

	HRESULT hr = S_OK;

	//Create Windows Imaging Component ImagingFactory.
	SkTScopedComPtr<IWICImagingFactory> piImagingFactory;
	if (SUCCEEDED(hr)) {
	hr = CoCreateInstance(
	CLSID_WICImagingFactory
	, NULL
	, CLSCTX_INPROC_SERVER
	, IID_PPV_ARGS(&piImagingFactory)
	);
	}

	//Convert the SkWStream to an IStream.
	SkTScopedComPtr<IStream> piStream;
	if (SUCCEEDED(hr)) {
	hr = SkWIStream::CreateFromSkWStream(stream, &piStream);
	}

	//Create an encode of the appropriate type.
	SkTScopedComPtr<IWICBitmapEncoder> piEncoder;
	if (SUCCEEDED(hr)) {
	hr = piImagingFactory->CreateEncoder(type, NULL, &piEncoder);
	}

	if (SUCCEEDED(hr)) {
	hr = piEncoder->Initialize(piStream.get(), WICBitmapEncoderNoCache);
	}

	//Create a the frame.
	SkTScopedComPtr<IWICBitmapFrameEncode> piBitmapFrameEncode;
	SkTScopedComPtr<IPropertyBag2> piPropertybag;
	if (SUCCEEDED(hr)) {
	hr = piEncoder->CreateNewFrame(&piBitmapFrameEncode, &piPropertybag);
	}

	if (SUCCEEDED(hr)) {
	PROPBAG2 name = { 0 };
	name.dwType = PROPBAG2_TYPE_DATA;
	name.vt = VT_R4;
	name.pstrName = L"ImageQuality";

	VARIANT value;
	VariantInit(&value);
	value.vt = VT_R4;
	value.fltVal = (FLOAT)(quality / 100.0);

	//Ignore result code.
	// This returns E_FAIL if the named property is not in the bag.
	//TODO(bungeman) enumerate the properties,
	// write and set hr iff property exists.
	piPropertybag->Write(1, &name, &value);
	}
	if (SUCCEEDED(hr)) {
	hr = piBitmapFrameEncode->Initialize(piPropertybag.get());
	}

	//Set the size of the frame.
	const UINT width = bitmap->width();
	const UINT height = bitmap->height();
	if (SUCCEEDED(hr)) {
	hr = piBitmapFrameEncode->SetSize(width, height);
	}

	//Set the pixel format of the frame.
	const WICPixelFormatGUID formatDesired = GUID_WICPixelFormat32bppBGRA;
	WICPixelFormatGUID formatGUID = formatDesired;
	if (SUCCEEDED(hr)) {
	hr = piBitmapFrameEncode->SetPixelFormat(&formatGUID);
	}
	if (SUCCEEDED(hr)) {
	//Be sure the image format is the one requested.
	hr = IsEqualGUID(formatGUID, formatDesired) ? S_OK : E_FAIL;
	}

	//Write the pixels into the frame.
	if (SUCCEEDED(hr)) {
	SkAutoLockPixels alp(*bitmap);
	const UINT stride = (UINT) bitmap->rowBytes();
	hr = piBitmapFrameEncode->WritePixels(
	height
	, stride
	, stride * height
	, reinterpret_cast<BYTE*>(bitmap->getPixels()));
	}

	if (SUCCEEDED(hr)) {
	hr = piBitmapFrameEncode->Commit();
	}

	if (SUCCEEDED(hr)) {
	hr = piEncoder->Commit();
	}

	return SUCCEEDED(hr);
	}

	///////////////////////////////////////////////////////////////////////////////

	static SkImageEncoder* sk_imageencoder_wic_factory(SkImageEncoder::Type t) {
	switch (t) {
	case SkImageEncoder::kBMP_Type:
	case SkImageEncoder::kICO_Type:
	case SkImageEncoder::kJPEG_Type:
	case SkImageEncoder::kPNG_Type:
	break;
	default:
	return NULL;
	}
	return SkNEW_ARGS(SkImageEncoder_WIC, (t));
	}

	static SkImageEncoder_EncodeReg gEReg(sk_imageencoder_wic_factory);

	static SkImageDecoder::Format get_format_wic(SkStreamRewindable* stream) {
	SkImageDecoder::Format format;
	SkImageDecoder_WIC codec;
	if (!codec.decodeStream(stream, NULL, SkImageDecoder_WIC::kDecodeFormat_WICMode, &format)) {
	format = SkImageDecoder::kUnknown_Format;
	}
	return format;
	}

	static SkImageDecoder_FormatReg gFormatReg(get_format_wic);