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      1 /*
      2  * Copyright 2016 Google Inc.
      3  *
      4  * Use of this source code is governed by a BSD-style license that can be
      5  * found in the LICENSE file.
      6  */
      7 
      8 #include "SkTypes.h"
      9 
     10 #if defined(SK_BUILD_FOR_WIN)
     11 
     12 #include "SkData.h"
     13 #include "SkImageGenerator.h"
     14 #include "SkTemplates.h"
     15 #include "SkTScopedComPtr.h"
     16 
     17 #include <wincodec.h>
     18 
     19 /*
     20  * Any Windows program that uses COM must initialize the COM library by calling
     21  * the CoInitializeEx function.  In addition, each thread that uses a COM
     22  * interface must make a separate call to this function.
     23  *
     24  * For every successful call to CoInitializeEx, the thread must call
     25  * CoUninitialize before it exits.
     26  *
     27  * SkImageGeneratorWIC requires the COM library and leaves it to the client to
     28  * initialize COM for their application.
     29  *
     30  * For more information on initializing COM, please see:
     31  * https://msdn.microsoft.com/en-us/library/windows/desktop/ff485844.aspx
     32  */
     33 class SkImageGeneratorWIC : public SkImageGenerator {
     34 public:
     35     /*
     36      * Refs the data if an image generator can be returned.  Otherwise does
     37      * not affect the data.
     38      */
     39     static SkImageGenerator* NewFromEncodedWIC(SkData* data);
     40 
     41 protected:
     42     SkData* onRefEncodedData() override;
     43 
     44     bool onGetPixels(const SkImageInfo& info, void* pixels, size_t rowBytes, const Options&)
     45     override;
     46 
     47 private:
     48     /*
     49      * Takes ownership of the imagingFactory
     50      * Takes ownership of the imageSource
     51      * Refs the data
     52      */
     53     SkImageGeneratorWIC(const SkImageInfo& info, IWICImagingFactory* imagingFactory,
     54             IWICBitmapSource* imageSource, SkData* data);
     55 
     56     SkTScopedComPtr<IWICImagingFactory> fImagingFactory;
     57     SkTScopedComPtr<IWICBitmapSource>   fImageSource;
     58     sk_sp<SkData>                       fData;
     59 
     60     typedef SkImageGenerator INHERITED;
     61 };
     62 
     63 #endif // SK_BUILD_FOR_WIN
     64