本文整理汇总了C++中SkTScopedComPtr::Seek方法的典型用法代码示例。如果您正苦于以下问题：C++ SkTScopedComPtr::Seek方法的具体用法？C++ SkTScopedComPtr::Seek怎么用？C++ SkTScopedComPtr::Seek使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类SkTScopedComPtr的用法示例。
在下文中一共展示了SkTScopedComPtr::Seek方法的2个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: onDecode
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.........
示例2: decodeStream
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.........