C++ SkTScopedComPtr::Initialize方法代码示例

bool SkImageGeneratorWIC::onGetPixels(const SkImageInfo& info, void* pixels, size_t rowBytes,
        SkPMColor ctable[], int* ctableCount) {
    if (kN32_SkColorType != info.colorType()) {
        return false;
    }

    // Create a format converter.
    SkTScopedComPtr<IWICFormatConverter> formatConverter;
    HRESULT hr = fImagingFactory->CreateFormatConverter(&formatConverter);
    if (FAILED(hr)) {
        return false;
    }

    GUID format = GUID_WICPixelFormat32bppPBGRA;
    if (kUnpremul_SkAlphaType == info.alphaType()) {
        format = GUID_WICPixelFormat32bppBGRA;
    }

    hr = formatConverter->Initialize(fImageSource.get(), format, WICBitmapDitherTypeNone, nullptr,
            0.0, WICBitmapPaletteTypeCustom);
    if (FAILED(hr)) {
        return false;
    }

    // Treat the format converter as an image source.
    SkTScopedComPtr<IWICBitmapSource> formatConverterSrc;
    hr = formatConverter->QueryInterface(IID_PPV_ARGS(&formatConverterSrc));
    if (FAILED(hr)) {
        return false;
    }

    // Set the destination pixels.
    hr = formatConverterSrc->CopyPixels(nullptr, (UINT) rowBytes, (UINT) rowBytes * info.height(),
            (BYTE*) pixels);

    return SUCCEEDED(hr);
}

bool SkImageDecoder_WIC::onDecode(SkStream* stream, SkBitmap* bm, Mode mode) {
    //Initialize COM.
    AutoCoInitialize scopedCo;
    HRESULT hr = scopedCo.getHR();
    
    //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
        );
    }
    
    //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->setConfig(SkBitmap::kARGB_8888_Config, width, height);
        if (SkImageDecoder::kDecodeBounds_Mode == mode) {
            return true;
        }
        if (!this->allocPixelRef(bm, NULL)) {
            return false;
        }
    }
    
    //Create a format converter.
    SkTScopedComPtr<IWICFormatConverter> piFormatConverter;
    if (SUCCEEDED(hr)) {
        hr = piImagingFactory->CreateFormatConverter(&piFormatConverter);
    }
    
    if (SUCCEEDED(hr)) {
        hr = piFormatConverter->Initialize(
            piBitmapSourceOriginal.get()      //Input bitmap to convert
            , GUID_WICPixelFormat32bppPBGRA   //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)) {
        bm->lockPixels();
        bm->eraseColor(0);
//.........这里部分代码省略.........

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

    //Initialize COM.
    AutoCoInitialize scopedCo;
    HRESULT hr = scopedCo.getHR();
    
    //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 = bm.width();
    const UINT height = bm.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)) {
        hr = piBitmapFrameEncode->WritePixels(
            height
            , bm.rowBytes()
            , bm.rowBytes()*height
            , reinterpret_cast<BYTE*>(bm.getPixels()));
//.........这里部分代码省略.........

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
            , nullptr
            , 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, nullptr, &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;
//.........这里部分代码省略.........

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
            , nullptr
            , 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, nullptr);
    }

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

    if (kDecodeFormat_WICMode == wicMode) {
        SkASSERT(format != nullptr);
        //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, nullptr)) {
            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 {
//.........这里部分代码省略.........