Direct2D Bitmap操作

加入位元影像操作需要引入WIC組件，過程將更複雜：

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#include "stdafx.h"D2D1_COLOR_F const COLOR_BLUE   = { 0.26f, 0.56f, 0.87f, 1.0f };D2D1_COLOR_F const COLOR_WHITE    = { 1.0f,  1.0f,  1.0f,  1.0f };D2D1_COLOR_F const COLOR_BLACK    = { 0.0f,  0.0f,  0.0f,  1.0f };D2D1_COLOR_F const COLOR_YELLOW = { 0.99f, 0.85f, 0.0f,  1.0f };D2D1_COLOR_F const COLOR_RED    = { 1.0f,  0.0f,  0.0f,  1.0f };struct ComInitialize{    ComInitialize()    {        HR(CoInitialize(nullptr));    }    ~ComInitialize()    {        CoUninitialize();    }};template <typename T>void CreateInstance(REFCLSID clsid, ComPtr<T>& ptr){    ASSERT(!ptr);    HR(CoCreateInstance(clsid, nullptr, CLSCTX_INPROC_SERVER,         __uuidof(T), reinterpret_cast<void **>(ptr.GetAddressOf())));}struct SampleWindow : DesktopWindow<SampleWindow>{    ComPtr<IWICFormatConverter> m_image;    ComPtr<ID2D1Bitmap> m_bitmap;    D2D1_RECT_F m_location;    void CreateDeviceIndependentResources()    {        ComPtr<IWICImagingFactory> imageFactory;        CreateInstance(CLSID_WICImagingFactory, imageFactory);        ComPtr<IWICBitmapDecoder> decoder;        HR(imageFactory->CreateDecoderFromFilename(L"C:\\Users\\Flysha\\Desktop\\cnblogs.gif",             nullptr, GENERIC_READ,             WICDecodeMetadataCacheOnLoad, decoder.GetAddressOf()));        ComPtr<IWICBitmapFrameDecode> frame;        HR(decoder->GetFrame(0, frame.GetAddressOf()));        ASSERT(!m_image);        HR(imageFactory->CreateFormatConverter(m_image.GetAddressOf()));        m_image->Initialize(frame.Get(), GUID_WICPixelFormat32bppPBGRA,             WICBitmapDitherTypeNone, nullptr, 0.0,             WICBitmapPaletteTypeCustom);    }    LRESULT MouseMoveHandler(UINT, WPARAM, LPARAM lparam, BOOL&)    {        WORD x = LOWORD(lparam);        WORD y = HIWORD(lparam);        D2D1_POINT_2U size;        m_image->GetSize(&size.x, &size.y);        m_location = RectF(x, y, x + size.x, y + size.y);        Invalidate();        return 0;    }    void CreateDeviceResources()    {        HR(m_target->CreateBitmapFromWicBitmap(m_image.Get(),             m_bitmap.ReleaseAndGetAddressOf()));    }    void Draw()    {        m_target->Clear(COLOR_BLUE);        m_target->DrawBitmap(m_bitmap.Get(), m_location, 1.0f, D2D1_BITMAP_INTERPOLATION_MODE_LINEAR);    }};int __stdcall wWinMain(HINSTANCE, HINSTANCE, PWSTR, int){    ComInitialize com;    SampleWindow window;    window.Run();}

樣本中加入了圖片隨滑鼠移動而移動的功能。

可能通過將WIC圖片（IWICFormatConverter）轉換為D2D圖片畫筆（ID2D1BitmapBrush），可以設定更多有意思的效果：

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#include "stdafx.h"D2D1_COLOR_F const COLOR_BLUE   = { 0.26f, 0.56f, 0.87f, 1.0f };D2D1_COLOR_F const COLOR_WHITE    = { 1.0f,  1.0f,  1.0f,  1.0f };D2D1_COLOR_F const COLOR_BLACK    = { 0.0f,  0.0f,  0.0f,  1.0f };D2D1_COLOR_F const COLOR_YELLOW = { 0.99f, 0.85f, 0.0f,  1.0f };D2D1_COLOR_F const COLOR_RED    = { 1.0f,  0.0f,  0.0f,  1.0f };struct ComInitialize{    ComInitialize()    {        HR(CoInitialize(nullptr));    }    ~ComInitialize()    {        CoUninitialize();    }};template <typename T>void CreateInstance(REFCLSID clsid, ComPtr<T>& ptr){    ASSERT(!ptr);    HR(CoCreateInstance(clsid, nullptr, CLSCTX_INPROC_SERVER,         __uuidof(T), reinterpret_cast<void **>(ptr.GetAddressOf())));}struct SampleWindow : DesktopWindow<SampleWindow>{    ComPtr<IWICFormatConverter> m_image;    ComPtr<ID2D1BitmapBrush> m_brush;    D2D1_RECT_F m_location;        void CreateDeviceIndependentResources()    {        ComPtr<IWICImagingFactory> imageFactory;        CreateInstance(CLSID_WICImagingFactory, imageFactory);        ComPtr<IWICBitmapDecoder> decoder;        HR(imageFactory->CreateDecoderFromFilename(L"C:\\Users\\Flysha\\Desktop\\cnblogs.gif",             nullptr, GENERIC_READ,             WICDecodeMetadataCacheOnLoad, decoder.GetAddressOf()));        ComPtr<IWICBitmapFrameDecode> frame;        HR(decoder->GetFrame(0, frame.GetAddressOf()));        HR(imageFactory->CreateFormatConverter(m_image.GetAddressOf()));        HR(m_image->Initialize(frame.Get(), GUID_WICPixelFormat32bppPBGRA,             WICBitmapDitherTypeNone, nullptr, 0.0,             WICBitmapPaletteTypeCustom));    }    LRESULT MouseMoveHandler(UINT, WPARAM, LPARAM lparam, BOOL&)    {        WORD x = LOWORD(lparam);        WORD y = HIWORD(lparam);        D2D1_POINT_2U size;        m_image->GetSize(&size.x, &size.y);        m_location = RectF(x, y, x + (FLOAT)size.x, y + (FLOAT)size.y);        Invalidate();        return 0;    }    void CreateDeviceResources()    {        ComPtr<ID2D1Bitmap> bitmap;        HR(m_target->CreateBitmapFromWicBitmap(m_image.Get(),             bitmap.GetAddressOf()));        m_target->CreateBitmapBrush(bitmap.Get(),             m_brush.ReleaseAndGetAddressOf());    }    void Draw()    {        m_target->Clear(COLOR_BLUE);        auto size = m_target->GetSize();        auto rect = RectF(0.0f, 0.0f, size.width, size.height);        m_brush->SetExtendModeX(D2D1_EXTEND_MODE_WRAP);        m_brush->SetExtendModeY(D2D1_EXTEND_MODE_MIRROR);        m_target->FillRectangle(rect, m_brush.Get());    }};int __stdcall wWinMain(HINSTANCE, HINSTANCE, PWSTR, int){    ComInitialize com;    SampleWindow window;    window.Run();}

除此之外，還可以直接將IWICBitmap儲存為圖形檔案：

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#include "stdafx.h"void SaveAs(ComPtr<IWICImagingFactory>& imageFactory,             ComPtr<IWICBitmap> & bitmap,             PWSTR filename){    ComPtr<IStream> file;    HR(SHCreateStreamOnFileEx(filename,         STGM_CREATE | STGM_WRITE | STGM_SHARE_EXCLUSIVE,         FILE_ATTRIBUTE_NORMAL,         TRUE,         nullptr,         file.GetAddressOf()));    ComPtr<IWICBitmapEncoder> encoder;    HR(imageFactory->CreateEncoder(GUID_ContainerFormatPng,         nullptr,         encoder.GetAddressOf()));    HR(encoder->Initialize(file.Get(), WICBitmapEncoderNoCache));    ComPtr<IWICBitmapFrameEncode> frame;    ComPtr<IPropertyBag2> props;    HR(encoder->CreateNewFrame(frame.GetAddressOf(), props.GetAddressOf()));    HR(frame->Initialize(props.Get()));    UINT width, height;    HR(bitmap->GetSize(&width, &height));    HR(frame->SetSize(width, height));    WICPixelFormatGUID pixelFormat;    HR(bitmap->GetPixelFormat(&pixelFormat));    HR(frame->SetPixelFormat(&pixelFormat));    HR(frame->WriteSource(bitmap.Get(), nullptr));    HR(frame->Commit());    HR(encoder->Commit());}int __stdcall wWinMain(HINSTANCE, HINSTANCE, PWSTR, int){    ComInitialize com;    ComPtr<IWICImagingFactory> imageFactory;    CreateInstance(CLSID_WICImagingFactory, imageFactory);    ComPtr<IWICBitmap> bitmap;    HR(imageFactory->CreateBitmap(600, 400,         GUID_WICPixelFormat32bppPBGRA,         WICBitmapCacheOnLoad,         bitmap.GetAddressOf()));    ComPtr<ID2D1Factory> factory;    HR(D2D1CreateFactory(D2D1_FACTORY_TYPE_SINGLE_THREADED, factory.GetAddressOf()));    ComPtr<ID2D1RenderTarget> target;    HR(factory->CreateWicBitmapRenderTarget(bitmap.Get(),         RenderTargetProperties(), target.GetAddressOf()));    ComPtr<ID2D1SolidColorBrush> brush;    HR(target->CreateSolidColorBrush(COLOR_BLUE, brush.GetAddressOf()));    target->BeginDraw();    target->Clear();    target->DrawEllipse(Ellipse(Point2F(300.0f, 200.0f), 100.0f, 180.0f), brush.Get(), 10.0f);    HR(target->EndDraw());        PWSTR filename = L"C:\\users\\flysha\\desktop\\cnblogs.png";    SaveAs(imageFactory, bitmap, filename);    ShellExecute(nullptr, nullptr, filename, nullptr, nullptr, SW_SHOWDEFAULT);}