Re: Here !

zodX — Thu, 25 Jun 2009 13:31:41 GMT

Hi, there !

I´ve tried the Bitmap Opacity Masking Example.

Get it from here:
http://msdn.microsoft.com/en-us/library/dd372307(VS.85).aspx

The >Bitmap-Opacity-Mask< is always opaque and not transparent, I see no checkerboard thru.
e.g. tried loading 8bit,32bit,straight,premueltiplied,tif,bmp for it.

Maybe you know how to fix this, it´s nearly the original sample.
Do I have to specially load any exotic-prepared bitmaps ? Or are any exotic parameters wrong ?
I couldn´t understand why this sample mustn´t work.

My Opacity Mask Sample I´ve changed this little bit:
Changed BitmaploadfromResource into BitmaploadfromFile (beneath identical).

// THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF
// ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO
// THE IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A
// PARTICULAR PURPOSE.
//
// Copyright (c) Microsoft Corporation. All rights reserved
//+-----------------------------------------------------------------------------
//
//
// $Description:
// Sample DirectWrite Application
//
// $ENDTAG
//
//------------------------------------------------------------------------------

#include "stdafx.h"

/******************************************************************
*                                                                 *
* WinMain                                                        *
*                                                                 *
* Application entrypoint                                         *
*                                                                 *
******************************************************************/

int WINAPI WinMain(
    HINSTANCE hInstance,
    HINSTANCE hPrevInstance,
    LPSTR lpCmdLine,
    int nCmdShow)
{
    HRESULT hr;
    if (SUCCEEDED(CoInitialize(NULL)))
    {
        {
            DemoApp app;

            if (SUCCEEDED(hr = app.Initialize()))
            {
                app.RunMessageLoop();
            }
        }
        CoUninitialize();
    }

return SUCCEEDED(hr) ? EXIT_SUCCESS : EXIT_FAILURE;
}

/******************************************************************
*                                                                 *
* DemoApp::DemoApp constructor                                   *
*                                                                 *
* Initialize member data                                         *
*                                                                 *
******************************************************************/

DemoApp::DemoApp() :
m_hwnd(NULL)
{
}

/******************************************************************
*                                                                 *
* DemoApp::~DemoApp destructor                                   *
*                                                                 *
* Tear down resources                                            *
*                                                                 *
******************************************************************/

DemoApp::~DemoApp()
{
}

/******************************************************************
*                                                                 *
* DemoApp::Initialize                                            *
*                                                                 *
* Create application window and device-independent resources     *
*                                                                 *
******************************************************************/
HRESULT DemoApp::Initialize()
{
WNDCLASSEX wcex;
    HRESULT hr;
    ATOM atom;

IFR(CreateDeviceIndependentResources());

    // Register window class
    wcex.cbSize        = sizeof(WNDCLASSEX);
    wcex.style         = CS_HREDRAW | CS_VREDRAW;
    wcex.lpfnWndProc   = DemoApp::WndProc;
    wcex.cbClsExtra    = 0;
    wcex.cbWndExtra    = sizeof(LONG_PTR);
    wcex.hInstance     = HINST_THISCOMPONENT;
    wcex.hbrBackground = NULL;
    wcex.lpszMenuName = NULL;
    wcex.hIcon         = LoadIcon(
        NULL,
        IDI_APPLICATION
        );
    wcex.hCursor       = LoadCursor(
        NULL,
        IDC_ARROW
        );
    wcex.lpszClassName = TEXT("D2DDemoApp");
    wcex.hIconSm       = LoadIcon(
        NULL,
        IDI_APPLICATION
        );

    atom = RegisterClassEx(
        &wcex
        );

IFR(atom ? S_OK : E_FAIL);

    //
    // Create Window takes its size in Pixels, so, to have a consistent DIP size, you
    // obtain the DPI and use it to scale the window size.
    FLOAT dpiX, dpiY;

    //
    // The factory returns the current system DPI. This is also the value it will use
    // to create its own windows.
    //
    m_spD2DFactory->GetDesktopDpi(&dpiX, &dpiY);

    // Create window
    m_hwnd = CreateWindow(
        TEXT("D2DDemoApp"),
        TEXT("Direct2D Demo App"),
        WS_OVERLAPPEDWINDOW,
        CW_USEDEFAULT,
        CW_USEDEFAULT,
        static_cast<UINT>(dpiX * 800.f / 96.f),
        static_cast<UINT>(dpiY * 800.f / 96.f),
        NULL,
        NULL,
        HINST_THISCOMPONENT,
        this
        );

IFR(m_hwnd ? S_OK : E_FAIL);

ShowWindow(m_hwnd, SW_SHOWNORMAL);

UpdateWindow(m_hwnd);

return hr;
}

/******************************************************************
*                                                                 *
* DemoApp::CreateDeviceIndependentResources                      *
*                                                                 *
* This method is used to create resources which are not bound    *
* to any device. Their lifetime effectively extends for the      *
* duration of the app.                                           *
*                                                                 *
******************************************************************/

HRESULT DemoApp::CreateDeviceIndependentResources()
{
    HRESULT hr = S_OK;

    // Create WIC factory
    IFR(CoCreateInstance(
        CLSID_WICImagingFactory,
        NULL,
        CLSCTX_INPROC_SERVER,
        IID_IWICImagingFactory,
        reinterpret_cast<void **>(&m_spWICFactory)
        ));

    // Create Direct2D factory
    IFR(D2D1CreateFactory(
        D2D1_FACTORY_TYPE_SINGLE_THREADED,
        &m_spD2DFactory
        ));

    // Create a shared DirectWrite factory
    IFR(DWriteCreateFactory(
        DWRITE_FACTORY_TYPE_SHARED,
        __uuidof(IDWriteFactory),
        reinterpret_cast<IUnknown**>(&m_spDWriteFactory)
        ));

    m_spD2DFactory->CreateRectangleGeometry(D2D1::RectF(0,5,200,195),&m_spRectGeo);

    m_wszOriginalBitmapText=L"Original Bitmap";
    m_wszBitmapBrushOpacityMaskText=L"Bitmap Opacity Mask";
    m_wszLinearGradientOpacityMaskText=L"Linear Gradient Opacity Mask";
    m_wszRadialGradientOpacityMaskText=L"Radial Gradient Opacity Mask";
    m_wszWithBitmapBrushOpacityMaskText=L"Bitmap With Bitmap Opacity Mask Applied";
    m_wszWithLinearGradientOpacityMaskText=L"Bitmap With Linear Gradient Opacity Mask Applied";
    m_wszWithRadialGradientOpacityMaskText=L"Bitmap With Radial Gradient Opacity Mask Applied";

    // Create a text format.
    IFR(m_spDWriteFactory->CreateTextFormat(
        L"Verdana", //font family name
        NULL, //font collection (NULL sets it to use the system font collection)
        DWRITE_FONT_WEIGHT_REGULAR,
        DWRITE_FONT_STYLE_NORMAL,
        DWRITE_FONT_STRETCH_NORMAL,
        12.0f,
        L"en-us",
        &m_spTextFormat
        ));

return hr;
}

/******************************************************************
*                                                                 *
* DemoApp::CreateDeviceResources                                 *
*                                                                 *
* This method creates resources which are bound to a particular *
* D3D device. It's all centralized here, in case the resources   *
* need to be recreated in case of D3D device loss (eg. display   *
* change, remoting, removal of video card, etc).                 *
*                                                                 *
******************************************************************/

HRESULT DemoApp::CreateDeviceResources()
{
HRESULT hr = S_OK;

if (!m_spRT)
{

RECT rc;
GetClientRect(m_hwnd, &rc);

        D2D1_SIZE_U size = D2D1::SizeU(
            rc.right - rc.left,
            rc.bottom - rc.top
        );

        // Create a Direct2D render target
        IFR(m_spD2DFactory->CreateHwndRenderTarget(
            D2D1::RenderTargetProperties(),
            D2D1::HwndRenderTargetProperties(
                m_hwnd,
                size
                ),
            &m_spRT
            ));

IFR(m_spRT->CreateSolidColorBrush(D2D1::ColorF(D2D1::ColorF::Black),&m_spBlackBrush));

//Create the bitmap to be used by the bitmap brush

   // Instead of loadingFromResource this is the only part I changed in this sample
   // But unlikely the official text-samples haven´t got the images with it
   LoadBitmapFromFile(m_spRT,
            m_spWICFactory,
            L"V:\\GRAPHIK space 4D\\Masking Test.bmp",
            0,
            0,
            &m_spBitmap
            );

   LoadBitmapFromFile(m_spRT,
            m_spWICFactory,
            L"V:\\GRAPHIK space 4D\\Masking Test2.bmp",
            0,
            0,
            &m_spBitmapMask
            );

D2D1_BITMAP_BRUSH_PROPERTIES propertiesXClampYClamp = { D2D1_EXTEND_MODE_CLAMP, D2D1_EXTEND_MODE_CLAMP,

D2D1_BITMAP_INTERPOLATION_MODE_NEAREST_NEIGHBOR };

  IFR(m_spRT->CreateBitmapBrush(
            m_spBitmap,
            propertiesXClampYClamp,
            &m_spOriginalBitmapBrush));

        IFR(m_spRT->CreateBitmapBrush(
            m_spBitmapMask,
            propertiesXClampYClamp,
            &m_spBitmapMaskBrush));


        //Create an array of gradient stops to put in the gradient stop collection which will be used in the linear

gradient brush

        D2D1_GRADIENT_STOP gradientStops[2];
        gradientStops[0].color = D2D1::ColorF(D2D1::ColorF::Black,1.0f);
        gradientStops[0].position = 0.0f;
        gradientStops[1].color = D2D1::ColorF(D2D1::ColorF::White,0.0f);
        gradientStops[1].position = 1.0f;

        //Create the ID2D1GradientStopCollection from a previously declared array of D2D1_GRADIENT_STOP structs
        IFR(m_spRT->CreateGradientStopCollection(gradientStops,
            2,
            D2D1_GAMMA_2_2,
            D2D1_EXTEND_MODE_CLAMP,
            &m_spGradientStopCollection));


        //The line that determines the direction of the gradient starts at the top left corner of the box to the

bottom right corner
IFR(m_spRT->CreateLinearGradientBrush(D2D1::LinearGradientBrushProperties(D2D1::Point2F(0,0),D2D1::Point2F

(200,200)),
            m_spGradientStopCollection,
            &m_spLinearGradientBrush));

        //The center of the gradient is in the center of the box. The gradient origin offset was set to zero(0,0) or

center in this case.
IFR(m_spRT->CreateRadialGradientBrush(D2D1::RadialGradientBrushProperties(D2D1::Point2F(100,100),

D2D1::Point2F(0,0), 100,100),
            m_spGradientStopCollection,
            &m_spRadialGradientBrush));


        // Create the compatible render target
        ID2D1BitmapRenderTargetPtr spCompatibleRenderTarget;
        IFR(m_spRT->CreateCompatibleRenderTarget(D2D1::SizeF(20.0f, 20.0f),
            &spCompatibleRenderTarget));

        // Create the pattern
        ID2D1SolidColorBrushPtr spWhiteBrush;
        IFR(spCompatibleRenderTarget->CreateSolidColorBrush(D2D1::ColorF(D2D1::ColorF::White),
            &spWhiteBrush));

        ID2D1SolidColorBrushPtr spGrayBrush;
        IFR(spCompatibleRenderTarget->CreateSolidColorBrush(D2D1::ColorF(D2D1::ColorF::LightGray),
            &spGrayBrush));

        //Draw filled rectangles onto the render target
        spCompatibleRenderTarget->BeginDraw();
        spCompatibleRenderTarget->FillRectangle(D2D1::RectF(0.0f, 0.0f, 10.0f, 10.0f), spGrayBrush);
        spCompatibleRenderTarget->FillRectangle(D2D1::RectF(10.0f, 0.0f, 20.0f, 10.0f), spWhiteBrush);
        spCompatibleRenderTarget->FillRectangle(D2D1::RectF(10.0f, 10.0f, 20.0f, 20.0f), spGrayBrush);
        spCompatibleRenderTarget->FillRectangle(D2D1::RectF(0.0f, 10.0f, 10.0f, 20.0f), spWhiteBrush);
        spCompatibleRenderTarget->EndDraw();

//Get the bitmap from the render target.
IFR(spCompatibleRenderTarget->GetBitmap(&m_spCheckeredBitmap));

//Choose the tiling mode for the bitmap brush
D2D1_BITMAP_BRUSH_PROPERTIES brushProperties = D2D1::BitmapBrushProperties(D2D1_EXTEND_MODE_WRAP,

D2D1_EXTEND_MODE_WRAP);

        //Create the bitmap brush
        IFR(m_spRT->CreateBitmapBrush(m_spCheckeredBitmap, brushProperties, &m_spCheckerPatternBitmapBrush));
    }

return hr;
}

/******************************************************************
*                                                                 *
* DemoApp::DiscardDeviceResources                                *
*                                                                 *
* Discard device-specific resources which need to be recreated   *
* when a D3D device is lost                                      *
*                                                                 *
******************************************************************/

void DemoApp::DiscardDeviceResources()
{
    m_spRT = NULL;
    m_spBlackBrush = NULL;
    m_spLinearGradientBrush = NULL;
    m_spRadialGradientBrush = NULL;
    m_spOriginalBitmapBrush = NULL;
    m_spGradientStopCollection = NULL;
    m_spCheckerPatternBitmapBrush = NULL;

}

/******************************************************************
*                                                                 *
* DemoApp::RunMessageLoop                                        *
*                                                                 *
* Main window message loop                                       *
*                                                                 *
******************************************************************/

void DemoApp::RunMessageLoop()
{
MSG msg;

    while (GetMessage(&msg, NULL, 0, 0)>0)
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }
}

/******************************************************************
*                                                                 *
* DemoApp::OnRender                                              *
*                                                                 *
* Called whenever the application needs to display the client    *
* window.                                                        *
*                                                                 *
* Note that this function will not render anything if the window *
* is occluded (eg. obscured by other windows or off monitor).    *
* Also, this function will automatically discard device-specific *
* resources if the D3D device disappears during execution, and   *
* will recreate the resources the next time it's invoked.        *
*                                                                 *
******************************************************************/

HRESULT DemoApp::OnRender(const PAINTSTRUCT &ps)
{
HRESULT hr;

IFR(DrawD2DContent(ps));

return hr;
}

/******************************************************************
*                                                                 *
* DemoApp::DrawD2DContent                                        *
*                                                                 *
* This method draws blocks demonstrating different opacity       *
* masks.                                                         *
*                                                                 *
*                                                                 *
* Note that this function will not render anything if the window *
* is occluded (eg. obscured by other windows or off monitor).    *
* Also, this function will automatically discard device-specific *
* resources if the D3D device disappears during execution, and   *
* will recreate the resources the next time it's invoked.        *
*                                                                 *
******************************************************************/

HRESULT DemoApp::DrawD2DContent(const PAINTSTRUCT &ps)
{
HRESULT hr = S_OK;

CreateDeviceResources();

    if (!(m_spRT->CheckWindowState() & D2D1_WINDOW_STATE_OCCLUDED))
    {
        m_spRT->BeginDraw();

        m_spRT->SetTransform(
            D2D1::Matrix3x2F::Identity()
            );
        //Rectangle that holds the shape of rectangles to be filled with brushes
        D2D1_RECT_F rcBrushRect = D2D1::RectF(0,5, 200, 195);

//Rectangle that holds the shape of rectangles where captions are drawn with DrawText
D2D1_RECT_F rcTextRect = D2D1::RectF(5,205,200,300);

        //Starting with a white background
        m_spRT->Clear(D2D1::ColorF(D2D1::ColorF::Blue));

        ////Original Bitmap
        m_spRT->SetTransform(D2D1::Matrix3x2F::Translation(D2D1::SizeF(5, 5)));
        m_spRT->FillRectangle(&rcBrushRect,m_spOriginalBitmapBrush);
        m_spRT->DrawRectangle(&rcBrushRect,m_spBlackBrush,1,NULL);

  //
//  m_spRT->DrawBitmap(m_spOpacityMask);
        //

  //Caption using a DirectWrite format from m_spDWriteFactory->CreateTextFormat
        m_spRT->DrawText(m_wszOriginalBitmapText,
            wcslen(m_wszOriginalBitmapText),
            m_spTextFormat,
            &rcTextRect,
            m_spBlackBrush);

        //Linear Gradient Opacity Mask
        m_spRT->SetTransform(D2D1::Matrix3x2F::Translation(D2D1::SizeF(255, 5)));
        m_spRT->FillRectangle(&rcBrushRect,m_spCheckerPatternBitmapBrush);
        m_spRT->FillRectangle(&rcBrushRect,m_spLinearGradientBrush);
        m_spRT->DrawRectangle(&rcBrushRect,m_spBlackBrush,1,NULL);

        //Caption using a DirectWrite format from m_spDWriteFactory->CreateTextFormat
        m_spRT->DrawText(m_wszLinearGradientOpacityMaskText,
            wcslen(m_wszLinearGradientOpacityMaskText),
            m_spTextFormat,
            &rcTextRect,
            m_spBlackBrush);

        //Radial Gradient Opacity Mask
        m_spRT->SetTransform(D2D1::Matrix3x2F::Translation(D2D1::SizeF(255, 255)));
        m_spRT->FillRectangle(&rcBrushRect,m_spCheckerPatternBitmapBrush);
        m_spRT->FillRectangle(&rcBrushRect,m_spRadialGradientBrush);
        m_spRT->DrawRectangle(&rcBrushRect,m_spBlackBrush,1,NULL);

        //Caption using a DirectWrite format from m_spDWriteFactory->CreateTextFormat
        m_spRT->DrawText(m_wszRadialGradientOpacityMaskText,
            wcslen(m_wszRadialGradientOpacityMaskText),
            m_spTextFormat,
            &rcTextRect,
            m_spBlackBrush);

        //Bitmap Opacity Mask
        m_spRT->SetTransform(D2D1::Matrix3x2F::Translation(D2D1::SizeF(255, 505)));
        m_spRT->FillRectangle(&rcBrushRect,m_spCheckerPatternBitmapBrush);
        m_spRT->FillRectangle(&rcBrushRect,m_spBitmapMaskBrush);
        m_spRT->DrawRectangle(&rcBrushRect,m_spBlackBrush,1,NULL);

        //Caption using a DirectWrite format from m_spDWriteFactory->CreateTextFormat
        m_spRT->DrawText(m_wszBitmapBrushOpacityMaskText,
            wcslen(m_wszBitmapBrushOpacityMaskText),
            m_spTextFormat,
            &rcTextRect,
            m_spBlackBrush);

        //Bitmap with Linear Gradient Opacity Brush
        m_spRT->SetTransform(D2D1::Matrix3x2F::Translation(D2D1::SizeF(505, 5)));
        m_spRT->FillGeometry(m_spRectGeo,m_spOriginalBitmapBrush,m_spLinearGradientBrush);
        m_spRT->DrawRectangle(&rcBrushRect,m_spBlackBrush,1,NULL);

        //Caption using a DirectWrite format from m_spDWriteFactory->CreateTextFormat
        m_spRT->DrawText(m_wszWithLinearGradientOpacityMaskText,
            wcslen(m_wszWithLinearGradientOpacityMaskText),
            m_spTextFormat,
            &rcTextRect,
            m_spBlackBrush);

        //Bitmap with Radial Gradient Opacity Brush
        m_spRT->SetTransform(D2D1::Matrix3x2F::Translation(D2D1::SizeF(505, 255)));
        m_spRT->FillGeometry(m_spRectGeo,m_spOriginalBitmapBrush,m_spRadialGradientBrush);
        m_spRT->DrawRectangle(&rcBrushRect,m_spBlackBrush,1,NULL);

        //Caption using a DirectWrite format from m_spDWriteFactory->CreateTextFormat
        m_spRT->DrawText(m_wszWithRadialGradientOpacityMaskText,
            wcslen(m_wszWithRadialGradientOpacityMaskText),
            m_spTextFormat,
            &rcTextRect,
            m_spBlackBrush);

//Bitmap with Bitmap Opacity Brush
m_spRT->SetTransform(D2D1::Matrix3x2F::Translation(D2D1::SizeF(505, 505)));

        //D2D1_ANTIALIAS_MODE_ALIASED must be set for FillOpacityMask to function properly
        m_spRT->SetAntialiasMode(D2D1_ANTIALIAS_MODE_ALIASED);

  m_spRT->FillOpacityMask(
   m_spBitmap,
            m_spBitmapMaskBrush,
   D2D1_OPACITY_MASK_CONTENT_GRAPHICS,
            0,
   0);

m_spRT->DrawRectangle(&rcBrushRect,m_spBlackBrush,1,NULL);

        //Caption using a DirectWrite format from m_spDWriteFactory->CreateTextFormat
        m_spRT->DrawText(m_wszWithBitmapBrushOpacityMaskText,
            wcslen(m_wszWithBitmapBrushOpacityMaskText),
            m_spTextFormat,
            &rcTextRect,
            m_spBlackBrush);

        hr = m_spRT->EndDraw();
    }

    if (hr == D2DERR_RECREATE_TARGET)
    {
        DiscardDeviceResources();
    }

return S_OK;
}

/******************************************************************
*                                                                 *
* DemoApp::OnResize                                              *
*                                                                 *
* If the application receives a WM_SIZE message, this method     *
* resize the render target appropriately.                        *
*                                                                 *
******************************************************************/

void DemoApp::OnResize(UINT width, UINT height)
{
    if (m_spRT)
    {
        D2D1_SIZE_U size;
        size.width = width;
        size.height = height;
        HRESULT hr = m_spRT->Resize(size);

        // If we couldn't resize, release it and we'll recreate it
        // during the next render pass.
        if (FAILED(hr))
        {
            DiscardDeviceResources();
            InvalidateRect(m_hwnd, NULL, FALSE);
        }
    }
}

/******************************************************************
*                                                                 *
* DemoApp::WndProc                                               *
*                                                                 *
* Window message handler                                         *
*                                                                 *
******************************************************************/

LRESULT CALLBACK DemoApp::WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    if (message == WM_CREATE)
    {
        LPCREATESTRUCT pcs = (LPCREATESTRUCT)lParam;
        DemoApp *pDemoApp = (DemoApp *)pcs->lpCreateParams;

        ::SetWindowLongPtrW(
            hwnd,
            GWLP_USERDATA,
            PtrToUlong(pDemoApp));

return 1;
}

DemoApp *pDemoApp = reinterpret_cast<DemoApp *>(static_cast<LONG_PTR>(
::GetWindowLongPtrW(hwnd, GWLP_USERDATA)));

    if (pDemoApp)
    {
        switch(message)
        {
        case WM_SIZE:
            {
                UINT width = LOWORD(lParam);
                UINT height = HIWORD(lParam);
                pDemoApp->OnResize(width, height);
                //InvalidateRect(hwnd, NULL, true);
            }
            return 0;

        case WM_PAINT:
        case WM_DISPLAYCHANGE:
            {
                Sleep(200);
    PAINTSTRUCT ps;
                BeginPaint(hwnd, &ps);
                pDemoApp->OnRender(ps);
                EndPaint(hwnd, &ps);
            }
            return 0;

        case WM_DESTROY:
            {
                PostQuitMessage(0);
            }
            return 1;
        }
    }
    return DefWindowProc(hwnd, message, wParam, lParam);
}

//
//
//
// Creates a Direct2D bitmap from the specified
// file name.
//
//
//
HRESULT DemoApp::LoadBitmapFromFile(
    ID2D1RenderTarget *pRenderTarget,
    IWICImagingFactory *pIWICFactory,
    PCWSTR uri,
    UINT destinationWidth,
    UINT destinationHeight,
    __deref_out ID2D1Bitmap **ppBitmap
    )
{
    HRESULT hr = S_OK;

    IWICBitmapDecoderPtr spDecoder;
    IWICBitmapFrameDecodePtr spSource;
    IWICStreamPtr spStream;
    IWICFormatConverterPtr spConverter;
    IWICBitmapScalerPtr spScaler;

    IFR(pIWICFactory->CreateDecoderFromFilename(
        uri, NULL, GENERIC_READ, WICDecodeMetadataCacheOnLoad, &spDecoder
        ));

    // Create the initial frame.
    IFR(spDecoder->GetFrame(0, &spSource));

// Convert the image format to 32bppPBGRA -- which Direct2D expects.
IFR(pIWICFactory->CreateFormatConverter(&spConverter));

    // If a new width or height was specified, create an
    // IWICBitmapScaler and use it to resize the image.
    if (destinationWidth != 0 || destinationHeight != 0){

UINT originalWidth, originalHeight;
spSource->GetSize(&originalWidth, &originalHeight);

        if (destinationWidth == 0){
            FLOAT scalar = static_cast<FLOAT>(destinationHeight) / static_cast<FLOAT>(originalHeight);
            destinationWidth = static_cast<UINT>(scalar * static_cast<FLOAT>(originalWidth));
        }
        else if (destinationHeight == 0) {
            FLOAT scalar = static_cast<FLOAT>(destinationWidth) / static_cast<FLOAT>(originalWidth);
            destinationHeight = static_cast<UINT>(scalar * static_cast<FLOAT>(originalHeight));
        }

        IFR(pIWICFactory->CreateBitmapScaler(&spScaler));
        IFR(spScaler->Initialize(
                spSource,
                destinationWidth,
                destinationHeight,
                WICBitmapInterpolationModeCubic
                ));

        IFR(spConverter->Initialize(
            spScaler,
            GUID_WICPixelFormat32bppPBGRA,
            WICBitmapDitherTypeNone,
            NULL,
            0.f,
            WICBitmapPaletteTypeMedianCut
            ));
    }
    else // Don't scale the image.
    {

        IFR(spConverter->Initialize(
            spSource,
            GUID_WICPixelFormat32bppPBGRA,
            WICBitmapDitherTypeNone,
            NULL,
            0.f,
            WICBitmapPaletteTypeMedianCut
            ));

}

    // Create a Direct2D bitmap from the WIC bitmap.
    IFR(pRenderTarget->CreateBitmapFromWicBitmap(
        spConverter,
        NULL,
        ppBitmap
        ));

return hr;
}

General

Re: Here !

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