Tag Archives: Direct2D

Codexpert – 2017 Articles Summary

Note

MFC (still) rulz!

MFC Support for Windows Animation

Let’s say we have to make a slide show presentation using Cross Fade effect. If the target system is Windows 10, that’s quite easy because Direct2D offers built-in Cross Fade effect.

Cross Fade effect example

void CAnimationWnd::Draw(CRenderTarget* pRenderTarget)
{
    // get ID2D1DeviceContext interface; note: must include 
    CComQIPtr<ID2D1DeviceContext> spDeviceContext = pRenderTarget->GetRenderTarget();

    // create cross-fade effect; note include  and link to dxguid.lib
    CComPtr<ID2D1Effect> spCrossFadeEffect;
    spDeviceContext->CreateEffect(CLSID_D2D1CrossFade, &spCrossFadeEffect);
    // ...
    // set source and destination bitmaps
    spCrossFadeEffect->SetInput(0, m_pBitmapSrc->Get());
    spCrossFadeEffect->SetInput(1, m_pBitmapDest->Get());

    // get "animated" value (uncomment the line below if use Windows Animation)
    // m_spAnimCrossFadeWeightValue->GetValue(m_dWeight);

    // set cross-fade effect weight
    // for a value of 0.0f the destination image is exclusively used
    // for a value of 1.0f the source image is exclusively used
    spCrossFadeEffect->SetValue(D2D1_CROSSFADE_PROP_WEIGHT, static_cast<FLOAT>(m_dWeight));

    // perform drawing
    spDeviceContext->DrawImage(spCrossFadeEffect);
}

void CAnimationWnd::Draw(CRenderTarget* pRenderTarget)

{

// get ID2D1DeviceContext interface; note: must include

CComQIPtr<ID2D1DeviceContext> spDeviceContext = pRenderTarget->GetRenderTarget();

// create cross-fade effect; note include and link to dxguid.lib

CComPtr<ID2D1Effect> spCrossFadeEffect;

spDeviceContext->CreateEffect(CLSID_D2D1CrossFade, &spCrossFadeEffect);

// ...

// set source and destination bitmaps

spCrossFadeEffect->SetInput(0, m_pBitmapSrc->Get());

spCrossFadeEffect->SetInput(1, m_pBitmapDest->Get());

// get "animated" value (uncomment the line below if use Windows Animation)

// m_spAnimCrossFadeWeightValue->GetValue(m_dWeight);

// set cross-fade effect weight

// for a value of 0.0f the destination image is exclusively used

// for a value of 1.0f the source image is exclusively used

spCrossFadeEffect->SetValue(D2D1_CROSSFADE_PROP_WEIGHT, static_cast<FLOAT>(m_dWeight));

// perform drawing

spDeviceContext->DrawImage(spCrossFadeEffect);

}

Further we can set a timer to periodically change m_dWeight value from 0.0f to 1.0f. So far, so good but a better solution is to use Windows Animation interfaces that allow to implement animations that are smooth, natural, and interactive. Moreover, MFC offers wrapper classes that can make programmer’s life much more easier than in case of direct using COM interfaces.

Using MFC support for animation

To use MFC support for animation do the following:

first of all we need an object of type CAnimationController which is the key class that manages animations;
call CAnimationController::SetRelatedWnd in order to establish a window that will receive WM_PAINT message when animation manager status has changed or animation timer has been updated;
call CAnimationController::EnableAnimationTimerEventHandler;
add an animation object, in our case of type CAnimationValue as long as we only need an “animated” FLOAT to set cross-fade weight property; here is a list of MFC animation object classes defined in afxanimationcontroller.h
- CAnimationValue
- CAnimationPoint
- CAnimationSize
- CAnimationColor
- CAnimationRect
add transition(s) to animation object; here is a list of transition MFC classes:
- CAccelerateDecelerateTransition
- CConstantTransition
- CCubicTransition
- CDiscreteTransition
- CInstantaneousTransition
- CLinearTransition
- CLinearTransitionFromSpeed
- CSmoothStopTransition
- CParabolicTransitionFromAcceleration
- CReversalTransition
- CSinusoidalTransitionFromRange
- CSinusoidalTransitionFromVelocity
- CSinusoidalTransitionFromVelocity
uncomment the line containing m_spAnimCrossFadeWeightValue->GetValue(m_dWeight) in the previous example;
finally, call CAnimationController::AnimateGroup.

Here is some sample code:

void CAnimationWnd::PreSubclassWindow()
{
    // ...

    // this window receive WM_PAINT when animation manager state has changed 
    // or timer post update event has occurred
    m_animController.SetRelatedWnd(this);
    // set a handler for timing events and handler for timing updates
    m_animController.EnableAnimationTimerEventHandler();

    m_spAnimCrossFadeWeightValue = std::make_unique<CAnimationValue>(DEMO_DEFAULT_CROSSFADE_WEIGHT_VALUE, DEMO_GROUP_ID);
    m_animController.AddAnimationObject(m_spAnimCrossFadeWeightValue.get());

    // ...
}

void CAnimationWnd::PreSubclassWindow()

{

// ...

// this window receive WM_PAINT when animation manager state has changed

// or timer post update event has occurred

m_animController.SetRelatedWnd(this);

// set a handler for timing events and handler for timing updates

m_animController.EnableAnimationTimerEventHandler();

m_spAnimCrossFadeWeightValue = std::make_unique<CAnimationValue>(DEMO_DEFAULT_CROSSFADE_WEIGHT_VALUE, DEMO_GROUP_ID);

m_animController.AddAnimationObject(m_spAnimCrossFadeWeightValue.get());

// ...

}

void CAnimationWnd::Animate()
{
    // ...

    // clear existing transitions
    m_spAnimCrossFadeWeightValue->ClearTransitions(TRUE);

    // set initial animation value (here is 1.0f)
    *m_spAnimCrossFadeWeightValue = DEMO_MAX_CROSSFADE_WEIGHT_VALUE;
    // add linear transition to minimum value (0.0f in our case)
    m_spAnimCrossFadeWeightValue->AddTransition(new CLinearTransition(DEMO_TRANSITION_DURATION,
        DEMO_MIN_CROSSFADE_WEIGHT_VALUE));

    // add constant transition; the value remains constant during given duration
    m_spAnimCrossFadeWeightValue->AddTransition(new CConstantTransition(DEMO_TRANSITION_DURATION));

    // add linear transition to maximum value (1.0f)
    m_spAnimCrossFadeWeightValue->AddTransition(new CLinearTransition(DEMO_TRANSITION_DURATION,
        DEMO_MAX_CROSSFADE_WEIGHT_VALUE));

    // run animation
    m_animController.AnimateGroup(DEMO_GROUP_ID);
}

void CAnimationWnd::Animate()

{

// ...

// clear existing transitions

m_spAnimCrossFadeWeightValue->ClearTransitions(TRUE);

// set initial animation value (here is 1.0f)

*m_spAnimCrossFadeWeightValue = DEMO_MAX_CROSSFADE_WEIGHT_VALUE;

// add linear transition to minimum value (0.0f in our case)

m_spAnimCrossFadeWeightValue->AddTransition(new CLinearTransition(DEMO_TRANSITION_DURATION,

DEMO_MIN_CROSSFADE_WEIGHT_VALUE));

// add constant transition; the value remains constant during given duration

m_spAnimCrossFadeWeightValue->AddTransition(new CConstantTransition(DEMO_TRANSITION_DURATION));

// add linear transition to maximum value (1.0f)

m_spAnimCrossFadeWeightValue->AddTransition(new CLinearTransition(DEMO_TRANSITION_DURATION,

DEMO_MAX_CROSSFADE_WEIGHT_VALUE));

// run animation

m_animController.AnimateGroup(DEMO_GROUP_ID);

}

More details can be found in the attached demo project.

Demo project

Download: MFC Support for Animation Demo.zip (220)

Cross Fade Effect with Animation 1

Cross Fade Effect with Animation 2

Cross Fade Effect with Animation 3

Resources and related articles

MSDN: CAnimationController Class
MSDN: CAnimationValue Class
MSDN: CLinearTransition Class
MSDN: Cross Fade effect
Marc Gregoire’s Blog: The New MFC Animation API
Codexpert blog: MFC Support for Direct2D – Part 6: Composite Effects

MFC Support for Direct2D – Part 7: Saving to files

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Once have enabled Direct2D support in an MFC application, there is no sweat to load an image from a file, by using one of CD2DBitmap constructors.
Unfortunately, we cannot find a CD2DBitmap method to save it into a image file (something similar to CImage::Save or Gdiplus::Image::Save).
No problem, we can try to do it ourselves. Here is an example:

Create and use a WIC bitmap render target

void CDemoView::SaveImageToFile(CD2DBitmap* pBitmap, const CString& strFilePath, GUID containerFormat)
{
    if (!pBitmap)
        AfxThrowOleException(E_FAIL);

    // Get global Direct2D and WIC factories
    _AFX_D2D_STATE* pD2DState = AfxGetD2DState();
    ID2D1Factory* pD2DFactory = pD2DState->GetDirect2dFactory();
    IWICImagingFactory* pWICFactory = pD2DState->GetWICFactory();
    if (!pD2DFactory || !pWICFactory)
        AfxThrowOleException(E_FAIL);

    // Create a WIC bitmap
    const CD2DSizeF size = pBitmap->GetSize();
    const UINT nWidth = static_cast<UINT>(size.width);
    const UINT nHeight = static_cast<UINT>(size.height);
    CComPtr<IWICBitmap> spWicBitmap;
    HRESULT hr = pWICFactory->CreateBitmap(nWidth, nHeight,
        GUID_WICPixelFormat32bppPBGRA, WICBitmapCacheOnLoad, &spWicBitmap);
    ATLENSURE_SUCCEEDED(hr);

    // Create a Direct2D render target that renders to a WIC bitmap
    ID2D1RenderTarget* pRenderTarget = NULL;
    hr = pD2DFactory->CreateWicBitmapRenderTarget(spWicBitmap,
        &D2D1::RenderTargetProperties(D2D1_RENDER_TARGET_TYPE_SOFTWARE,
            D2D1::PixelFormat(DXGI_FORMAT_B8G8R8A8_UNORM, D2D1_ALPHA_MODE_PREMULTIPLIED),
            0.f, 0.f, D2D1_RENDER_TARGET_USAGE_NONE),
        &pRenderTarget);
    ATLENSURE_SUCCEEDED(hr);

    // Draw the Direct2D bitmap into created WIC bitmap render target
    CRenderTarget renderTarget;
    renderTarget.Attach(pRenderTarget);
    renderTarget.BeginDraw();
    renderTarget.DrawBitmap(pBitmap, CD2DRectF(0, 0, size.width, size.height));
    hr = renderTarget.EndDraw();
    ATLENSURE_SUCCEEDED(hr);

    // Use WIC stuff to save the WIC bitmap into a file
    CComPtr<IWICStream> spStream;
    hr = pWICFactory->CreateStream(&spStream);
    ATLENSURE_SUCCEEDED(hr);

    hr = spStream->InitializeFromFilename(strFilePath, GENERIC_WRITE);
    ATLENSURE_SUCCEEDED(hr);

    CComPtr<IWICBitmapEncoder> spEncoder;
    hr = pWICFactory->CreateEncoder(containerFormat, NULL, &spEncoder.p);
    ATLENSURE_SUCCEEDED(hr);

    hr = spEncoder->Initialize(spStream, WICBitmapEncoderNoCache);
    ATLENSURE_SUCCEEDED(hr);
    CComPtr<IWICBitmapFrameEncode> spFrameEncode;

    hr = spEncoder->CreateNewFrame(&spFrameEncode, NULL);
    ATLENSURE_SUCCEEDED(hr);

    hr = spFrameEncode->Initialize(NULL);
    ATLENSURE_SUCCEEDED(hr);

    hr = spFrameEncode->SetSize(nWidth, nHeight);
    ATLENSURE_SUCCEEDED(hr);

    WICPixelFormatGUID pixelFormat = GUID_WICPixelFormatDontCare;
    hr = spFrameEncode->SetPixelFormat(&pixelFormat);
    ATLENSURE_SUCCEEDED(hr);

    hr = spFrameEncode->WriteSource(spWicBitmap, NULL);
    ATLENSURE_SUCCEEDED(hr);

    hr = spFrameEncode->Commit();
    ATLENSURE_SUCCEEDED(hr);

    hr = spEncoder->Commit();
    ATLENSURE_SUCCEEDED(hr);
}

void CDemoView::SaveImageToFile(CD2DBitmap* pBitmap, const CString& strFilePath, GUID containerFormat)

{

if (!pBitmap)

AfxThrowOleException(E_FAIL);

// Get global Direct2D and WIC factories

_AFX_D2D_STATE* pD2DState = AfxGetD2DState();

ID2D1Factory* pD2DFactory = pD2DState->GetDirect2dFactory();

IWICImagingFactory* pWICFactory = pD2DState->GetWICFactory();

if (!pD2DFactory || !pWICFactory)

AfxThrowOleException(E_FAIL);

// Create a WIC bitmap

const CD2DSizeF size = pBitmap->GetSize();

const UINT nWidth = static_cast<UINT>(size.width);

const UINT nHeight = static_cast<UINT>(size.height);

CComPtr<IWICBitmap> spWicBitmap;

HRESULT hr = pWICFactory->CreateBitmap(nWidth, nHeight,

GUID_WICPixelFormat32bppPBGRA, WICBitmapCacheOnLoad, &spWicBitmap);

ATLENSURE_SUCCEEDED(hr);

// Create a Direct2D render target that renders to a WIC bitmap

ID2D1RenderTarget* pRenderTarget = NULL;

hr = pD2DFactory->CreateWicBitmapRenderTarget(spWicBitmap,

&D2D1::RenderTargetProperties(D2D1_RENDER_TARGET_TYPE_SOFTWARE,

D2D1::PixelFormat(DXGI_FORMAT_B8G8R8A8_UNORM, D2D1_ALPHA_MODE_PREMULTIPLIED),

0.f, 0.f, D2D1_RENDER_TARGET_USAGE_NONE),

&pRenderTarget);

ATLENSURE_SUCCEEDED(hr);

// Draw the Direct2D bitmap into created WIC bitmap render target

CRenderTarget renderTarget;

renderTarget.Attach(pRenderTarget);

renderTarget.BeginDraw();

renderTarget.DrawBitmap(pBitmap, CD2DRectF(0, 0, size.width, size.height));

hr = renderTarget.EndDraw();

ATLENSURE_SUCCEEDED(hr);

// Use WIC stuff to save the WIC bitmap into a file

CComPtr<IWICStream> spStream;

hr = pWICFactory->CreateStream(&spStream);

ATLENSURE_SUCCEEDED(hr);

hr = spStream->InitializeFromFilename(strFilePath, GENERIC_WRITE);

ATLENSURE_SUCCEEDED(hr);

CComPtr<IWICBitmapEncoder> spEncoder;

hr = pWICFactory->CreateEncoder(containerFormat, NULL, &spEncoder.p);

ATLENSURE_SUCCEEDED(hr);

hr = spEncoder->Initialize(spStream, WICBitmapEncoderNoCache);

ATLENSURE_SUCCEEDED(hr);

CComPtr<IWICBitmapFrameEncode> spFrameEncode;

hr = spEncoder->CreateNewFrame(&spFrameEncode, NULL);

ATLENSURE_SUCCEEDED(hr);

hr = spFrameEncode->Initialize(NULL);

ATLENSURE_SUCCEEDED(hr);

hr = spFrameEncode->SetSize(nWidth, nHeight);

ATLENSURE_SUCCEEDED(hr);

WICPixelFormatGUID pixelFormat = GUID_WICPixelFormatDontCare;

hr = spFrameEncode->SetPixelFormat(&pixelFormat);

ATLENSURE_SUCCEEDED(hr);

hr = spFrameEncode->WriteSource(spWicBitmap, NULL);

ATLENSURE_SUCCEEDED(hr);

hr = spFrameEncode->Commit();

ATLENSURE_SUCCEEDED(hr);

hr = spEncoder->Commit();

ATLENSURE_SUCCEEDED(hr);

}

Looks good although it can be refactorized and/or can be improved for saving multiple frames, metadata and so on. However, it’s a problem: if the Direct2D bitmap (pBitmap) has been created in the window’s render target, EndDraw returns D2DERR_WRONG_RESOURCE_DOMAIN error (the resource was realized on the wrong render target). That is because CWnd::EnableD2DSupport creates a render target of type D2D1_RENDER_TARGET_TYPE_DEFAULT and as stated in the documentation, it cannot share its resources with another render targets. So, let’s replace EnableD2DSupport call with a call to another one (let’s say it EnableD2DSoftwareSupport).

Replace CWnd::EnableD2DSupport

int CDemoView::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
    if (__super::OnCreate(lpCreateStruct) == -1)
        return -1;

    try
    {
        // EnableD2DSupport(); // <-- TODO: remove this!
        EnableD2DSoftwareSupport();
    }
    catch (COleException* e)
    {
        e->ReportError();
        e->Delete();
        return -1;
    }
    return 0;
}

int CDemoView::OnCreate(LPCREATESTRUCT lpCreateStruct)

{

if (__super::OnCreate(lpCreateStruct) == -1)

return -1;

try

{

// EnableD2DSupport(); // <-- TODO: remove this!

EnableD2DSoftwareSupport();

}

catch (COleException* e)

{

e->ReportError();

e->Delete();

return -1;

}

return 0;

}

void CDemoView::EnableD2DSoftwareSupport()
{
    _AFX_D2D_STATE* pD2DState = AfxGetD2DState();
    if (pD2DState == NULL || !pD2DState->InitD2D())
        AfxThrowOleException(E_FAIL); // D2D is not supported by system

    if (IsD2DSupportEnabled())
        return; // Already enabled

    ID2D1Factory* pDirect2DFactory = AfxGetD2DState()->GetDirect2dFactory();
    ID2D1HwndRenderTarget* pHwndRenderTarget = NULL;
    D2D1_PIXEL_FORMAT pixelFormat = D2D1::PixelFormat(DXGI_FORMAT_B8G8R8A8_UNORM, D2D1_ALPHA_MODE_PREMULTIPLIED);
    D2D1_HWND_RENDER_TARGET_PROPERTIES hwndTargetProperties = D2D1::HwndRenderTargetProperties(m_hWnd);
    D2D1_RENDER_TARGET_PROPERTIES targetProperties = D2D1::RenderTargetProperties(D2D1_RENDER_TARGET_TYPE_SOFTWARE, pixelFormat);

    HRESULT hr = pDirect2DFactory->CreateHwndRenderTarget(
        targetProperties,
        hwndTargetProperties,
        &pHwndRenderTarget);
   
    ATLENSURE_SUCCEEDED(hr);

    // instantiate new CHwndRenderTarget and attach the GDI-compatible render target
    m_pRenderTarget = new CHwndRenderTarget;
    GetRenderTarget()->Attach(pHwndRenderTarget);
}

void CDemoView::EnableD2DSoftwareSupport()

{

_AFX_D2D_STATE* pD2DState = AfxGetD2DState();

if (pD2DState == NULL || !pD2DState->InitD2D())

AfxThrowOleException(E_FAIL); // D2D is not supported by system

if (IsD2DSupportEnabled())

return; // Already enabled

ID2D1Factory* pDirect2DFactory = AfxGetD2DState()->GetDirect2dFactory();

ID2D1HwndRenderTarget* pHwndRenderTarget = NULL;

D2D1_PIXEL_FORMAT pixelFormat = D2D1::PixelFormat(DXGI_FORMAT_B8G8R8A8_UNORM, D2D1_ALPHA_MODE_PREMULTIPLIED);

D2D1_HWND_RENDER_TARGET_PROPERTIES hwndTargetProperties = D2D1::HwndRenderTargetProperties(m_hWnd);

D2D1_RENDER_TARGET_PROPERTIES targetProperties = D2D1::RenderTargetProperties(D2D1_RENDER_TARGET_TYPE_SOFTWARE, pixelFormat);

HRESULT hr = pDirect2DFactory->CreateHwndRenderTarget(

targetProperties,

hwndTargetProperties,

&pHwndRenderTarget);

ATLENSURE_SUCCEEDED(hr);

// instantiate new CHwndRenderTarget and attach the GDI-compatible render target

m_pRenderTarget = new CHwndRenderTarget;

GetRenderTarget()->Attach(pHwndRenderTarget);

}

More details can be found in the demo application attached below. Just to note that forcing software rendering for window’s render target leads in performance penalty but generally, we can live with that until finding a better solution.

Demo application

The demo application is a simple image viewer using MFC support for Direct2D and WIC to load/save images from/into into files.
Download: Save Direct2D bitmap in a file - Demo.zip (275)

Resources and related articles

MSDN: Sharing Render Target Resources
MSDN: How to save Direct2D content to an image file
MSDN: Direct2D Error Codes
MSDN: ID2D1Factory::CreateWicBitmapRenderTarget method
Stackoverflow: Wrong render target ID2D1Bitmap
Codexpert: WIC topics
Codexpert: Direc2D topics

MFC Support for Direct2D – Part 6: Composite Effects

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We can combine two or more images and/or effects by using the composite effect. Here is an example.

Drawing shadows using Direct2D composite effects

void CD2DStaticCtrl::_DrawImageWithShadow(CHwndRenderTarget* pRenderTarget)
{
    ASSERT(pRenderTarget && pRenderTarget->IsValid());
    ASSERT(m_pBitmap && m_pBitmap->IsValid());

    // get ID2D1DeviceContext interface; note: must include <d2d1_1.h>
    CComQIPtr<ID2D1DeviceContext> spDeviceContext =
        pRenderTarget->GetRenderTarget();

    // create shadow effect and set the input image
    CComPtr<ID2D1Effect> spShadowEffect;
    spDeviceContext->CreateEffect(CLSID_D2D1Shadow, &spShadowEffect);
    spShadowEffect->SetInput(0, m_pBitmap->Get());
    spShadowEffect->SetValue(D2D1_SHADOW_PROP_BLUR_STANDARD_DEVIATION, m_fBlurStandardDeviation);
    spShadowEffect->SetValue(D2D1_SHADOW_PROP_COLOR, CRenderTarget::COLORREF_TO_D2DCOLOR(m_shadowColor));

    // create flood effect
    CComPtr<ID2D1Effect> spFloodEffect;
    spDeviceContext->CreateEffect(CLSID_D2D1Flood, &spFloodEffect);
    // Note: shadow will be composed in the top of a surface having the background color
    D2D1_COLOR_F color = CRenderTarget::COLORREF_TO_D2DCOLOR(m_backColor);
    spFloodEffect->SetValue(D2D1_FLOOD_PROP_COLOR, D2D1::Vector4F(color.r, color.g, color.b, color.a));

    // create 2D affine transform effect in order to translate the shadow
    CComPtr<ID2D1Effect> spAffineTransformEffect;
    spDeviceContext->CreateEffect(CLSID_D2D12DAffineTransform, &spAffineTransformEffect);
    spAffineTransformEffect->SetInputEffect(0, spShadowEffect);
    D2D1_MATRIX_3X2_F translation = D2D1::Matrix3x2F::Translation(m_fShadowDistance, m_fShadowDistance);
    spAffineTransformEffect->SetValue(D2D1_2DAFFINETRANSFORM_PROP_TRANSFORM_MATRIX, translation);
    
    // create the composite effect and combine the effects
    CComPtr<ID2D1Effect> spCompositeEffect;
    spDeviceContext->CreateEffect(CLSID_D2D1Composite, &spCompositeEffect);
    // set input effects
    spCompositeEffect->SetInputEffect(0, spFloodEffect);
    spCompositeEffect->SetInputEffect(1, spAffineTransformEffect);
    // set input image; because the default input count is 1, he have to set it to 3
    spCompositeEffect->SetInputCount(3);
    spCompositeEffect->SetInput(2, m_pBitmap->Get());

    // finally perform drawing
    spDeviceContext->DrawImage(spCompositeEffect);
}

void CD2DStaticCtrl::_DrawImageWithShadow(CHwndRenderTarget* pRenderTarget)

{

ASSERT(pRenderTarget && pRenderTarget->IsValid());

ASSERT(m_pBitmap && m_pBitmap->IsValid());

// get ID2D1DeviceContext interface; note: must include <d2d1_1.h>

CComQIPtr<ID2D1DeviceContext> spDeviceContext =

pRenderTarget->GetRenderTarget();

// create shadow effect and set the input image

CComPtr<ID2D1Effect> spShadowEffect;

spDeviceContext->CreateEffect(CLSID_D2D1Shadow, &spShadowEffect);

spShadowEffect->SetInput(0, m_pBitmap->Get());

spShadowEffect->SetValue(D2D1_SHADOW_PROP_BLUR_STANDARD_DEVIATION, m_fBlurStandardDeviation);

spShadowEffect->SetValue(D2D1_SHADOW_PROP_COLOR, CRenderTarget::COLORREF_TO_D2DCOLOR(m_shadowColor));

// create flood effect

CComPtr<ID2D1Effect> spFloodEffect;

spDeviceContext->CreateEffect(CLSID_D2D1Flood, &spFloodEffect);

// Note: shadow will be composed in the top of a surface having the background color

D2D1_COLOR_F color = CRenderTarget::COLORREF_TO_D2DCOLOR(m_backColor);

spFloodEffect->SetValue(D2D1_FLOOD_PROP_COLOR, D2D1::Vector4F(color.r, color.g, color.b, color.a));

// create 2D affine transform effect in order to translate the shadow

CComPtr<ID2D1Effect> spAffineTransformEffect;

spDeviceContext->CreateEffect(CLSID_D2D12DAffineTransform, &spAffineTransformEffect);

spAffineTransformEffect->SetInputEffect(0, spShadowEffect);

D2D1_MATRIX_3X2_F translation = D2D1::Matrix3x2F::Translation(m_fShadowDistance, m_fShadowDistance);

spAffineTransformEffect->SetValue(D2D1_2DAFFINETRANSFORM_PROP_TRANSFORM_MATRIX, translation);

// create the composite effect and combine the effects

CComPtr<ID2D1Effect> spCompositeEffect;

spDeviceContext->CreateEffect(CLSID_D2D1Composite, &spCompositeEffect);

// set input effects

spCompositeEffect->SetInputEffect(0, spFloodEffect);

spCompositeEffect->SetInputEffect(1, spAffineTransformEffect);

// set input image; because the default input count is 1, he have to set it to 3

spCompositeEffect->SetInputCount(3);

spCompositeEffect->SetInput(2, m_pBitmap->Get());

// finally perform drawing

spDeviceContext->DrawImage(spCompositeEffect);

}

Demo project

Download: Composite Effect Demo.zip (391)
You can set the amount of blur and the color as well as the distance of the shadow.

Composite Effect Demo

Resources and related articles

MSDN: Composite effect
MSDN: Shadow effect
Codexpert: MFC Support for Direct2D topics

MFC Support for DirectWrite – Part 11: About Trimming Again

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In a previous article, I showed how to trim a text which overflows the layout box. In the example presented there, the ellipsis is added at the end of truncated text. But if, let’s say, we have to show a long path and file name, it is not meaningful if the file name is not displayed. No problem, this can be easily resolved if have a look at DWRITE_TRIMMING structure which passed to IDWriteTextFormat::SetTrimming. The second parameter is a character code used as delimiter and the third one is the delimiter count. The text is preserved from the end until is found the delimiter which coresponds to delimiter count. For example, if the delimiter is backslash and the delimiter count is 2, a text like “e:\Articles\MFC Support for DirectWrite\DirectWrite Trimming Demo\D2DStaticCtrl.cpp” may be displayed as follows “e:\Articles…\DirectWrite Trimming Demo\D2DStaticCtrl.cpp”.

An example of trimming by using a delimiter

LRESULT CD2DStaticCtrl::OnAfxDraw2D(WPARAM wParam, LPARAM lParam)
{
    // ...

    // Set text trimming
    CComPtr<IDWriteInlineObject> spInlineObject;
    IDWriteFactory* pDirectWriteFactory = AfxGetD2DState()->GetWriteFactory();
    hr = pDirectWriteFactory->CreateEllipsisTrimmingSign(textFormat.Get(), 
        &spInlineObject);
    if (FAILED(hr))
        return FALSE;

    DWRITE_TRIMMING trimming = { DWRITE_TRIMMING_GRANULARITY_CHARACTER, '\\', 2 };

    hr = textFormat.Get()->SetTrimming(&trimming, spInlineObject);
    if (FAILED(hr))
        return FALSE;

    // ...

    return TRUE;
}

LRESULT CD2DStaticCtrl::OnAfxDraw2D(WPARAM wParam, LPARAM lParam)

{

// ...

// Set text trimming

CComPtr<IDWriteInlineObject> spInlineObject;

IDWriteFactory* pDirectWriteFactory = AfxGetD2DState()->GetWriteFactory();

hr = pDirectWriteFactory->CreateEllipsisTrimmingSign(textFormat.Get(),

&spInlineObject);

if (FAILED(hr))

return FALSE;

DWRITE_TRIMMING trimming = { DWRITE_TRIMMING_GRANULARITY_CHARACTER, '\\', 2 };

hr = textFormat.Get()->SetTrimming(&trimming, spInlineObject);

if (FAILED(hr))

return FALSE;

// ...

return TRUE;

}

Demo project

Download: DirectWrite Trimming Demo.zip (421)
The demo project is a simple MFC application which demonstrate how to trim text rendered with DirectWrite. You can choose the granularity, the delimiter and the delimiter count and see what is displayed.

DirectWrite Trimming Demo

Resources and related articles

MSDN: DWRITE_TRIMMING structure
Codexpert: MFC Support for DirectWrite – Part 8: Trimming

MFC Support for Direct2D – Part 5: Interoperability with GDI

3 Replies

There are two ways to combine Direct2D with Windows GDI API in the same application:

Drawing Direct2D content to a GDI device context
Drawing GDI content to a Direct2D GDI-compatible render target

Let’s see each one!

Drawing Direct2D content to a GDI device context

For this purpose, use ID2D1DCRenderTarget instead of ID2D1HwndRenderTarget interface. If using MFC shipped with Visual Studio 2015 or newer, then CDCRenderTarget wrapper class makes the programmer life easier. Here are the steps:

In the WM_CREATE message handler call CWnd::EnableD2DSupport passing TRUE as second parameter. This way, the MFC framework creates a CDCRenderTarget instead of a CHwndRenderTarget object.

int CChildView::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
    if (__super::OnCreate(lpCreateStruct) == -1)
        return -1;

    // Note: need Visual Studio 2015 or newer (_MFC_VER >= 0x0E00)
    BOOL bUseDCRenderTarget = TRUE;
    EnableD2DSupport(TRUE, bUseDCRenderTarget);

    if (!IsD2DSupportEnabled())
        return -1;

    return 0;
}

int CChildView::OnCreate(LPCREATESTRUCT lpCreateStruct)

{

if (__super::OnCreate(lpCreateStruct) == -1)

return -1;

// Note: need Visual Studio 2015 or newer (_MFC_VER >= 0x0E00)

BOOL bUseDCRenderTarget = TRUE;

EnableD2DSupport(TRUE, bUseDCRenderTarget);

if (!IsD2DSupportEnabled())

return -1;

return 0;

}

Map AFX_WM_DRAW2D registered messge.

C++

class CChildView : public CWnd { // ... afx_msg LRESULT OnAfxDraw2D(WPARAM wParam, LPARAM lParam); };

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class CChildView : public CWnd
{
    // ...
    afx_msg LRESULT OnAfxDraw2D(WPARAM wParam, LPARAM lParam);
};

C++

BEGIN_MESSAGE_MAP(CChildView, CWnd) // ... ON_REGISTERED_MESSAGE(AFX_WM_DRAW2D, &CChildView::OnAfxDraw2D) END_MESSAGE_MAP()

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BEGIN_MESSAGE_MAP(CChildView, CWnd)
    // ...
    ON_REGISTERED_MESSAGE(AFX_WM_DRAW2D, &CChildView::OnAfxDraw2D)
END_MESSAGE_MAP()

Finally, get the CDCRenderTarget* passed by MFC framework in LPARAM and enjoy.

LRESULT CChildView::OnAfxDraw2D(WPARAM wParam, LPARAM lParam)
{
    CDCRenderTarget* pDCRenderTarget = (CDCRenderTarget*)lParam;
    ASSERT_KINDOF(CDCRenderTarget, pDCRenderTarget);

    // Draw Direct2D content in GDI device context
    _DrawDirect2DContent(pDCRenderTarget);

    pDCRenderTarget->EndDraw();

    // Draw using GDI
    CWindowDC dc(this);
    _DrawGDIContent(&dc);

    return TRUE;
}

LRESULT CChildView::OnAfxDraw2D(WPARAM wParam, LPARAM lParam)

{

CDCRenderTarget* pDCRenderTarget = (CDCRenderTarget*)lParam;

ASSERT_KINDOF(CDCRenderTarget, pDCRenderTarget);

// Draw Direct2D content in GDI device context

_DrawDirect2DContent(pDCRenderTarget);

pDCRenderTarget->EndDraw();

// Draw using GDI

CWindowDC dc(this);

_DrawGDIContent(&dc);

return TRUE;

}

Drawing GDI content to a Direct2D GDI-compatible render target

So far, MFC has not a wrapper class for ID2D1GdiInteropRenderTarget interface. Also, CWnd::EnableD2DSupport creates a CHwndRenderTarget which is not GDI-compatible. So, we must do it ourselves. Here is the sample code:

class CChildView : public CWnd
{
    // ...
    CComQIPtr<ID2D1GdiInteropRenderTarget> m_spGdiInteropRenderTarget;
    // ...
    afx_msg LRESULT OnAfxDraw2D(WPARAM wParam, LPARAM lParam);
};

class CChildView : public CWnd

{

// ...

CComQIPtr<ID2D1GdiInteropRenderTarget> m_spGdiInteropRenderTarget;

// ...

afx_msg LRESULT OnAfxDraw2D(WPARAM wParam, LPARAM lParam);

};

int CChildView::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
    if (__super::OnCreate(lpCreateStruct) == -1)
        return -1;

    // get global Direct2D factory
    ID2D1Factory* pDirect2DFactory = AfxGetD2DState()->GetDirect2dFactory();

    // create GDI-compatible window render target
    D2D1_RENDER_TARGET_PROPERTIES rtProps = D2D1::RenderTargetProperties();
    rtProps.usage = D2D1_RENDER_TARGET_USAGE_GDI_COMPATIBLE;
    rtProps.pixelFormat.format = DXGI_FORMAT_B8G8R8A8_UNORM;
    rtProps.pixelFormat.alphaMode = D2D1_ALPHA_MODE_PREMULTIPLIED;

    ID2D1HwndRenderTarget* pHwndRenderTarget = NULL;
    HRESULT hr = pDirect2DFactory->CreateHwndRenderTarget(
        &rtProps,
        &D2D1::HwndRenderTargetProperties(m_hWnd, CD2DSizeU()),
        &pHwndRenderTarget);
    if (FAILED(hr))
        return -1;

    // instantiate new CHwndRenderTarget and attach the GDI-compatible render target
    m_pRenderTarget = new CHwndRenderTarget;
    GetRenderTarget()->Attach(pHwndRenderTarget);

    // create ID2D1GdiInteropRenderTarget instance
    m_spGdiInteropRenderTarget = pHwndRenderTarget;
    if (!m_spGdiInteropRenderTarget)
        return -1;

    return 0;
}

int CChildView::OnCreate(LPCREATESTRUCT lpCreateStruct)

{

if (__super::OnCreate(lpCreateStruct) == -1)

return -1;

// get global Direct2D factory

ID2D1Factory* pDirect2DFactory = AfxGetD2DState()->GetDirect2dFactory();

// create GDI-compatible window render target

D2D1_RENDER_TARGET_PROPERTIES rtProps = D2D1::RenderTargetProperties();

rtProps.usage = D2D1_RENDER_TARGET_USAGE_GDI_COMPATIBLE;

rtProps.pixelFormat.format = DXGI_FORMAT_B8G8R8A8_UNORM;

rtProps.pixelFormat.alphaMode = D2D1_ALPHA_MODE_PREMULTIPLIED;

ID2D1HwndRenderTarget* pHwndRenderTarget = NULL;

HRESULT hr = pDirect2DFactory->CreateHwndRenderTarget(

&rtProps,

&D2D1::HwndRenderTargetProperties(m_hWnd, CD2DSizeU()),

&pHwndRenderTarget);

if (FAILED(hr))

return -1;

// instantiate new CHwndRenderTarget and attach the GDI-compatible render target

m_pRenderTarget = new CHwndRenderTarget;

GetRenderTarget()->Attach(pHwndRenderTarget);

// create ID2D1GdiInteropRenderTarget instance

m_spGdiInteropRenderTarget = pHwndRenderTarget;

if (!m_spGdiInteropRenderTarget)

return -1;

return 0;

}

LRESULT CChildView::OnAfxDraw2D(WPARAM wParam, LPARAM lParam)
{
    CHwndRenderTarget* pHwndRenderTarget = (CHwndRenderTarget*)lParam;
    ASSERT_VALID(pHwndRenderTarget);

    // draw using Direct2D
    _DrawDirect2DContent(pHwndRenderTarget);

    HDC hDC = NULL;
    HRESULT hr = m_spGdiInteropRenderTarget->GetDC(
        D2D1_DC_INITIALIZE_MODE_COPY, &hDC);

    if (FAILED(hr) || (NULL == hDC))
        return FALSE;

    // draw GDI content in a GDI-compatible window render target
    _DrawGDIContent(CDC::FromHandle(hDC));

    CRect rcClient;
    GetClientRect(rcClient);
    hr = m_spGdiInteropRenderTarget->ReleaseDC(rcClient);
    if (FAILED(hr))
        return FALSE;

    return TRUE;
}

LRESULT CChildView::OnAfxDraw2D(WPARAM wParam, LPARAM lParam)

{

CHwndRenderTarget* pHwndRenderTarget = (CHwndRenderTarget*)lParam;

ASSERT_VALID(pHwndRenderTarget);

// draw using Direct2D

_DrawDirect2DContent(pHwndRenderTarget);

HDC hDC = NULL;

HRESULT hr = m_spGdiInteropRenderTarget->GetDC(

D2D1_DC_INITIALIZE_MODE_COPY, &hDC);

if (FAILED(hr) || (NULL == hDC))

return FALSE;

// draw GDI content in a GDI-compatible window render target

_DrawGDIContent(CDC::FromHandle(hDC));

CRect rcClient;

GetClientRect(rcClient);

hr = m_spGdiInteropRenderTarget->ReleaseDC(rcClient);

if (FAILED(hr))

return FALSE;

return TRUE;

}

Demo projects

Download: Direct2D and GDI Interop Demo.zip (539)

The Visual C++ solution attached here has two simple projects showing the both Direct2D and GDI interoperatibily methods listed above.

Direct2D and GDI Interop – Demo Application

Notes

can be observed that Direct2D drawing quality is higher than GDI drawing, because Direct2D is capable of rendering with antialiasing;
given the first note, my opinion is that GDI drawing has no much sense once using Direct2D but never know…

Resources and related articles

MSDN: Direct2D and GDI Interoperability Overview
MSDN: CDCRenderTarget Class
MSDN: ID2D1GdiInteropRenderTarget interface

MFC Support for Direct2D – Part 4: Built-in Effects

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Direct2D has built-in support for image processing like changing brightness or contrast, blurring, creating drop shadows, and so on. Basically, we can use for this purpose the CreateEffect and DrawImage methods of ID2D1DeviceContext interface. So far, there is no MFC wrapper class for ID2D1DeviceContext but that’s not so big issue. Once having a valid ID2D1RenderTarget instance (wrapped in CRenderTarget class) we can easily get the ID2D1DeviceContext interface by calling QueryInterface. No sweat!

Getting ID2D1DeviceContext interface in an MFC application

    CComPtr<ID2D1DeviceContext> spDeviceContext;
    pRenderTarget->GetRenderTarget()->QueryInterface(__uuidof(ID2D1DeviceContext), 
        reinterpret_cast<void**>(&spDeviceContext));
    // ...

CComPtr<ID2D1DeviceContext> spDeviceContext;

pRenderTarget->GetRenderTarget()->QueryInterface(__uuidof(ID2D1DeviceContext),

reinterpret_cast<void**>(&spDeviceContext));

// ...

Or, a little bit easier, use CComQIPtr which calls QueryInterface for you.

    CComQIPtr<ID2D1DeviceContext> spDeviceContext = pRenderTarget->GetRenderTarget();
    // ...

1 2	CComQIPtr<ID2D1DeviceContext> spDeviceContext = pRenderTarget->GetRenderTarget(); // ...

Drawing an image using the Gaussian Blur built-in effect

Here is an example:

void CChildView::_DrawBlurredImage(CRenderTarget* pRenderTarget)
{
    // ...
    // get ID2D1DeviceContext interface
    CComQIPtr<ID2D1DeviceContext> spDeviceContext = 
        pRenderTarget->GetRenderTarget();

    // create Gaussian Blur effect
    CComPtr<ID2D1Effect> spEffect;
    HRESULT hr = spDeviceContext->CreateEffect(CLSID_D2D1GaussianBlur, &spEffect);
    ATLASSERT(SUCCEEDED(hr));
    // ...

    // set the input image
    spEffect->SetInput(0, m_pBitmap->Get());

    // finally, call ID2D1DeviceContext::DrawImage
    spDeviceContext->DrawImage(spEffect);
    //
    // if it doesn't blew up until here, means that it works. :)
    // ...  
}

void CChildView::_DrawBlurredImage(CRenderTarget* pRenderTarget)

{

// ...

// get ID2D1DeviceContext interface

CComQIPtr<ID2D1DeviceContext> spDeviceContext =

pRenderTarget->GetRenderTarget();

// create Gaussian Blur effect

CComPtr<ID2D1Effect> spEffect;

HRESULT hr = spDeviceContext->CreateEffect(CLSID_D2D1GaussianBlur, &spEffect);

ATLASSERT(SUCCEEDED(hr));

// ...

// set the input image

spEffect->SetInput(0, m_pBitmap->Get());

// finally, call ID2D1DeviceContext::DrawImage

spDeviceContext->DrawImage(spEffect);

// if it doesn't blew up until here, means that it works. :)

// ...

}

Just note that you should additionally include d2d1_1.h header and link your project to dxguid.lib. More details can be found in the attached demo project.

The demo project

Download: Gaussian Blur Effect demo.zip (532)

Notes

Picture used in the demo application is taken from http://www.icondrawer.com/gift-icons.php
I have to apologize for blurring the little cute dog.

See also

Note

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Cross Fade effect example

Using MFC support for animation

Demo project

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Create and use a WIC bitmap render target

Replace CWnd::EnableD2DSupport

Demo application

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Drawing shadows using Direct2D composite effects

Demo project

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An example of trimming by using a delimiter

Demo project

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Drawing Direct2D content to a GDI device context

Drawing GDI content to a Direct2D GDI-compatible render target

Demo projects

Notes

Resources and related articles

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Like this:

Getting ID2D1DeviceContext interface in an MFC application

Drawing an image using the Gaussian Blur built-in effect

The demo project

Notes

Resources and related articles

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Like this: