Add SkImageGeneratorWIC

src/ports/SkImageGeneratorWIC.cpp

+/*
+ * Copyright 2016 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "SkImageGeneratorWIC.h"
+#include "SkIStream.h"
+#include "SkStream.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
+
+SkImageGenerator* SkImageGeneratorWIC::NewFromEncodedWIC(SkData* data) {
+    // Create Windows Imaging Component ImagingFactory.
+    SkTScopedComPtr<IWICImagingFactory> imagingFactory;
+    HRESULT hr = CoCreateInstance(CLSID_WICImagingFactory, nullptr, CLSCTX_INPROC_SERVER,
+            IID_PPV_ARGS(&imagingFactory));
+    if (FAILED(hr)) {
+        return nullptr;
+    }
+
+    // Coreate an IStream.

[scroggo, 2016/03/11 19:10:48]

Create*

[msarett, 2016/03/11 19:20:14]

Done.

+    SkTScopedComPtr<IStream> iStream;
+    // Note that iStream will take ownership of the new memory stream because
+    // we set |deleteOnRelease| to true.
+    hr = SkIStream::CreateFromSkStream(new SkMemoryStream(data), true, &iStream);
+    if (FAILED(hr)) {
+        return nullptr;
+    }
+
+    // Create the decoder from the stream.
+    SkTScopedComPtr<IWICBitmapDecoder> decoder;
+    hr = imagingFactory->CreateDecoderFromStream(iStream.get(), nullptr,
+            WICDecodeMetadataCacheOnDemand, &decoder);
+    if (FAILED(hr)) {
+        return nullptr;
+    }
+
+    // Select the first frame from the decoder.
+    SkTScopedComPtr<IWICBitmapFrameDecode> imageFrame;
+    hr = decoder->GetFrame(0, &imageFrame);
+    if (FAILED(hr)) {
+        return nullptr;
+    }
+
+    // Treat the frame as an image source.
+    SkTScopedComPtr<IWICBitmapSource> imageSource;
+    hr = imageFrame->QueryInterface(IID_PPV_ARGS(&imageSource));
+    if (FAILED(hr)) {
+        return nullptr;
+    }
+
+    // Get the size of the image.
+    UINT width;
+    UINT height;
+    hr = imageSource->GetSize(&width, &height);
+    if (FAILED(hr)) {
+        return nullptr;
+    }
+
+    // Get the encoded pixel format.
+    WICPixelFormatGUID format;
+    hr = imageSource->GetPixelFormat(&format);
+    if (FAILED(hr)) {
+        return nullptr;
+    }
+
+    // Recommend kOpaque if the image is opaque and kPremul otherwise.
+    // FIXME: We are stuck recommending kPremul for all indexed formats
+    //        (Ex: GUID_WICPixelFormat8bppIndexed) because we don't have
+    //        a way to check if the image has alpha.
+    SkAlphaType alphaType = kPremul_SkAlphaType;
+
+    if (GUID_WICPixelFormat16bppBGR555 == format ||

[msarett, 2016/03/11 18:18:24]

This is annoying.

I could limit this to the opaque types that are actually outputted by images
that we decode, but it feels safer to just check all opaque types.

[scroggo, 2016/03/11 19:10:48]

Yeah, it would be nice if there was an easier way to determine opacity/alpha
type.

On another note, this really feels like a switch statement to me, though perhaps
that's just personal preference.

[msarett, 2016/03/11 19:20:14]

I actually tried to make it a switch.  For some reason, the compiler won't allow
me to treat WICPixelFormatGUID as if it's an int/enum.

+        GUID_WICPixelFormat16bppBGR565 == format ||
+        GUID_WICPixelFormat32bppBGR101010 == format ||
+        GUID_WICPixelFormatBlackWhite == format ||
+        GUID_WICPixelFormat2bppGray == format ||
+        GUID_WICPixelFormat4bppGray == format ||
+        GUID_WICPixelFormat8bppGray == format ||
+        GUID_WICPixelFormat16bppGray == format ||
+        GUID_WICPixelFormat16bppGrayFixedPoint == format ||
+        GUID_WICPixelFormat16bppGrayHalf == format ||
+        GUID_WICPixelFormat32bppGrayFloat == format ||
+        GUID_WICPixelFormat32bppGrayFixedPoint == format ||
+        GUID_WICPixelFormat32bppRGBE == format ||
+        GUID_WICPixelFormat24bppRGB == format ||
+        GUID_WICPixelFormat24bppBGR == format ||
+        GUID_WICPixelFormat32bppBGR == format ||
+        GUID_WICPixelFormat48bppRGB == format ||
+        GUID_WICPixelFormat48bppBGR == format ||
+        GUID_WICPixelFormat48bppRGBFixedPoint == format ||
+        GUID_WICPixelFormat48bppBGRFixedPoint == format ||
+        GUID_WICPixelFormat48bppRGBHalf == format ||
+        GUID_WICPixelFormat64bppRGBFixedPoint == format ||
+        GUID_WICPixelFormat64bppRGBHalf == format ||
+        GUID_WICPixelFormat96bppRGBFixedPoint == format ||
+        GUID_WICPixelFormat128bppRGBFloat == format ||
+        GUID_WICPixelFormat128bppRGBFixedPoint == format ||
+        GUID_WICPixelFormat32bppRGB == format ||
+        GUID_WICPixelFormat64bppRGB == format ||
+        GUID_WICPixelFormat96bppRGBFloat == format ||
+        GUID_WICPixelFormat32bppCMYK == format ||
+        GUID_WICPixelFormat64bppCMYK == format ||
+        GUID_WICPixelFormat8bppY == format ||
+        GUID_WICPixelFormat8bppCb == format ||
+        GUID_WICPixelFormat8bppCr == format ||
+        GUID_WICPixelFormat16bppCbCr == format)
+    {
+        alphaType = kOpaque_SkAlphaType;
+    }
+
+    // FIXME: If we change the implementation to handle swizzling ourselves,
+    //        we can support more output formats.
+    SkImageInfo info = SkImageInfo::MakeN32(width, height, alphaType);
+    return new SkImageGeneratorWIC(info, imagingFactory.release(), imageSource.release(), data);
+}
+
+SkImageGeneratorWIC::SkImageGeneratorWIC(const SkImageInfo& info,
+        IWICImagingFactory* imagingFactory, IWICBitmapSource* imageSource, SkData* data)
+    : INHERITED(info)
+    , fImagingFactory(imagingFactory)
+    , fImageSource(imageSource)
+    , fData(SkRef(data))
+{}
+
+SkData* SkImageGeneratorWIC::onRefEncodedData(SK_REFENCODEDDATA_CTXPARAM) {
+    return SkRef(fData.get());
+}
+
+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, rowBytes, rowBytes * info.height(),
+            (BYTE*) pixels);
+
+    return SUCCEEDED(hr);
+}