287 lines
10 KiB
C++
287 lines
10 KiB
C++
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/************************************************************************
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*
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* File: GdiTextRenderer.cpp
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*
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* Description:
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*
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*
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* This file is part of the Microsoft Windows SDK Code Samples.
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*
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* Copyright (C) Microsoft Corporation. All rights reserved.
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*
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* This source code is intended only as a supplement to Microsoft
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* Development Tools and/or on-line documentation. See these other
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* materials for detailed information regarding Microsoft code samples.
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*
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* THIS CODE AND INFORMATION ARE PROVIDED AS IS WITHOUT WARRANTY OF ANY
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* KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A
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* PARTICULAR PURPOSE.
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*
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************************************************************************/
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#include "GdiInterop.h"
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/******************************************************************
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* *
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* GdiTextRenderer::GdiTextRenderer *
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* *
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* The constructor stores render target and the rendering params. *
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* *
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******************************************************************/
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GdiTextRenderer::GdiTextRenderer(
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IDWriteBitmapRenderTarget* bitmapRenderTarget,
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IDWriteRenderingParams* renderingParams
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)
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:
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cRefCount_(0),
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pRenderTarget_(bitmapRenderTarget),
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pRenderingParams_(renderingParams)
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{
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pRenderTarget_->AddRef();
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pRenderingParams_->AddRef();
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}
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/******************************************************************
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* *
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* GdiTextRenderer::GdiTextRenderer *
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* *
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* Destructor releases the interfaces passed when the class was *
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* created. *
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* *
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******************************************************************/
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GdiTextRenderer::~GdiTextRenderer()
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{
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SafeRelease(&pRenderTarget_);
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SafeRelease(&pRenderingParams_);
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}
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/******************************************************************
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* *
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* GdiTextRenderer::DrawGlyphRun *
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* *
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* Gets GlyphRun outlines via IDWriteFontFace::GetGlyphRunOutline *
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* and then draws and fills them using Direct2D path geometries *
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* *
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******************************************************************/
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STDMETHODIMP GdiTextRenderer::DrawGlyphRun(
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__maybenull void* clientDrawingContext,
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FLOAT baselineOriginX,
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FLOAT baselineOriginY,
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DWRITE_MEASURING_MODE measuringMode,
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__in DWRITE_GLYPH_RUN const* glyphRun,
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__in DWRITE_GLYPH_RUN_DESCRIPTION const* glyphRunDescription,
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IUnknown* clientDrawingEffect
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)
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{
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HRESULT hr = S_OK;
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// Pass on the drawing call to the render target to do the real work.
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RECT dirtyRect = {0};
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hr = pRenderTarget_->DrawGlyphRun(
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baselineOriginX,
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baselineOriginY,
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measuringMode,
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glyphRun,
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pRenderingParams_,
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RGB(0,200,255),
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&dirtyRect
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);
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return hr;
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}
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/******************************************************************
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* *
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* GdiTextRenderer::DrawUnderline *
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* *
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* This function is not implemented for the purposes of this *
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* sample. *
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* *
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******************************************************************/
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STDMETHODIMP GdiTextRenderer::DrawUnderline(
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__maybenull void* clientDrawingContext,
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FLOAT baselineOriginX,
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FLOAT baselineOriginY,
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__in DWRITE_UNDERLINE const* underline,
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IUnknown* clientDrawingEffect
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)
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{
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// Not implemented
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return E_NOTIMPL;
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}
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/******************************************************************
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* *
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* GdiTextRenderer::DrawStrikethrough *
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* *
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* This function is not implemented for the purposes of this *
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* sample. *
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* *
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******************************************************************/
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STDMETHODIMP GdiTextRenderer::DrawStrikethrough(
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__maybenull void* clientDrawingContext,
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FLOAT baselineOriginX,
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FLOAT baselineOriginY,
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__in DWRITE_STRIKETHROUGH const* strikethrough,
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IUnknown* clientDrawingEffect
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)
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{
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// Not implemented
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return E_NOTIMPL;
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}
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/******************************************************************
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* *
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* GdiTextRenderer::DrawInlineObject *
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* *
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* This function is not implemented for the purposes of this *
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* sample. *
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* *
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******************************************************************/
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STDMETHODIMP GdiTextRenderer::DrawInlineObject(
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__maybenull void* clientDrawingContext,
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FLOAT originX,
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FLOAT originY,
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IDWriteInlineObject* inlineObject,
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BOOL isSideways,
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BOOL isRightToLeft,
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IUnknown* clientDrawingEffect
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)
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{
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// Not implemented
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return E_NOTIMPL;
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}
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/******************************************************************
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* *
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* GdiTextRenderer::AddRef *
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* *
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* Increments the ref count *
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* *
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******************************************************************/
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STDMETHODIMP_(unsigned long) GdiTextRenderer::AddRef()
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{
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return InterlockedIncrement(&cRefCount_);
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}
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/******************************************************************
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* *
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* GdiTextRenderer::Release *
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* *
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* Decrements the ref count and deletes the instance if the ref *
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* count becomes 0 *
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* *
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******************************************************************/
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STDMETHODIMP_(unsigned long) GdiTextRenderer::Release()
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{
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long newCount = InterlockedDecrement(&cRefCount_);
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if (newCount == 0)
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{
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delete this;
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return 0;
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}
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return newCount;
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}
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/******************************************************************
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* *
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* GdiTextRenderer::IsPixelSnappingDisabled *
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* *
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* Determines whether pixel snapping is disabled. The recommended *
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* default is FALSE, unless doing animation that requires *
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* subpixel vertical placement. *
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* *
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******************************************************************/
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STDMETHODIMP GdiTextRenderer::IsPixelSnappingDisabled(
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__maybenull void* clientDrawingContext,
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__out BOOL* isDisabled
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)
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{
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*isDisabled = FALSE;
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return S_OK;
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}
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/******************************************************************
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* *
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* GdiTextRenderer::GetCurrentTransform *
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* *
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* Returns the current transform applied to the render target.. *
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* *
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******************************************************************/
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STDMETHODIMP GdiTextRenderer::GetCurrentTransform(
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__maybenull void* clientDrawingContext,
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__out DWRITE_MATRIX* transform
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)
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{
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//forward the render target's transform
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pRenderTarget_->GetCurrentTransform(transform);
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return S_OK;
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}
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/******************************************************************
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* *
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* GdiTextRenderer::GetPixelsPerDip *
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* *
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* This returns the number of pixels per DIP. *
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* *
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******************************************************************/
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STDMETHODIMP GdiTextRenderer::GetPixelsPerDip(
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__maybenull void* clientDrawingContext,
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__out FLOAT* pixelsPerDip
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)
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{
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*pixelsPerDip = pRenderTarget_->GetPixelsPerDip();
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return S_OK;
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}
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/******************************************************************
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* *
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* GdiTextRenderer::QueryInterface *
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* *
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* Query interface implementation *
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* *
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******************************************************************/
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STDMETHODIMP GdiTextRenderer::QueryInterface(
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IID const& riid,
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void** ppvObject
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)
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{
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if (__uuidof(IDWriteTextRenderer) == riid)
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{
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*ppvObject = this;
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}
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else if (__uuidof(IDWritePixelSnapping) == riid)
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{
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*ppvObject = this;
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}
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else if (__uuidof(IUnknown) == riid)
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{
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*ppvObject = this;
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}
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else
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{
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*ppvObject = NULL;
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return E_FAIL;
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}
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return S_OK;
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}
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