updated for version 7.4.393
Problem: Text drawing on newer MS-Windows systems is suboptimal. Some
multi-byte characters are not displayed, even though the same font
in Notepad can display them. (Srinath Avadhanula)
Solution: Add the 'renderoptions' option to enable Direct-X drawing. (Taro
Muraoka)
diff --git a/src/gui_dwrite.cpp b/src/gui_dwrite.cpp
new file mode 100644
index 0000000..cf83c05
--- /dev/null
+++ b/src/gui_dwrite.cpp
@@ -0,0 +1,901 @@
+/* vi:set ts=8 sts=4 sw=4 noet: */
+/*
+ * Author: MURAOKA Taro <koron.kaoriya@gmail.com>
+ *
+ * Contributors:
+ * - Ken Takata
+ *
+ * Copyright (C) 2013 MURAOKA Taro <koron.kaoriya@gmail.com>
+ * THIS FILE IS DISTRIBUTED UNDER THE VIM LICENSE.
+ */
+
+#define WIN32_LEAN_AND_MEAN
+
+#ifndef DYNAMIC_DIRECTX
+# if WINVER < 0x0600
+# error WINVER must be 0x0600 or above to use DirectWrite(DirectX)
+# endif
+#endif
+
+#include <windows.h>
+#include <crtdbg.h>
+#include <assert.h>
+#include <math.h>
+#include <d2d1.h>
+#include <d2d1helper.h>
+#include <dwrite.h>
+
+#include "gui_dwrite.h"
+
+#ifdef __MINGW32__
+# define __maybenull SAL__maybenull
+# define __in SAL__in
+# define __out SAL__out
+#endif
+
+#ifdef DYNAMIC_DIRECTX
+extern "C" HINSTANCE vimLoadLib(char *name);
+
+typedef int (WINAPI *PGETUSERDEFAULTLOCALENAME)(LPWSTR, int);
+typedef HRESULT (WINAPI *PD2D1CREATEFACTORY)(D2D1_FACTORY_TYPE,
+ REFIID, const D2D1_FACTORY_OPTIONS *, void **);
+typedef HRESULT (WINAPI *PDWRITECREATEFACTORY)(DWRITE_FACTORY_TYPE,
+ REFIID, IUnknown **);
+
+static HINSTANCE hD2D1DLL = NULL;
+static HINSTANCE hDWriteDLL = NULL;
+
+static PGETUSERDEFAULTLOCALENAME pGetUserDefaultLocaleName = NULL;
+static PD2D1CREATEFACTORY pD2D1CreateFactory = NULL;
+static PDWRITECREATEFACTORY pDWriteCreateFactory = NULL;
+
+#define GetUserDefaultLocaleName (*pGetUserDefaultLocaleName)
+#define D2D1CreateFactory (*pD2D1CreateFactory)
+#define DWriteCreateFactory (*pDWriteCreateFactory)
+
+ static void
+unload(HINSTANCE &hinst)
+{
+ if (hinst != NULL)
+ {
+ FreeLibrary(hinst);
+ hinst = NULL;
+ }
+}
+#endif // DYNAMIC_DIRECTX
+
+template <class T> inline void SafeRelease(T **ppT)
+{
+ if (*ppT)
+ {
+ (*ppT)->Release();
+ *ppT = NULL;
+ }
+}
+
+struct GdiTextRendererContext
+{
+ // const fields.
+ COLORREF color;
+ FLOAT cellWidth;
+
+ // working fields.
+ FLOAT offsetX;
+};
+
+ static DWRITE_PIXEL_GEOMETRY
+ToPixelGeometry(int value)
+{
+ switch (value)
+ {
+ default:
+ case 0:
+ return DWRITE_PIXEL_GEOMETRY_FLAT;
+ case 1:
+ return DWRITE_PIXEL_GEOMETRY_RGB;
+ case 2:
+ return DWRITE_PIXEL_GEOMETRY_BGR;
+ }
+}
+
+ static int
+ToInt(DWRITE_PIXEL_GEOMETRY value)
+{
+ switch (value)
+ {
+ case DWRITE_PIXEL_GEOMETRY_FLAT:
+ return 0;
+ case DWRITE_PIXEL_GEOMETRY_RGB:
+ return 1;
+ case DWRITE_PIXEL_GEOMETRY_BGR:
+ return 2;
+ default:
+ return -1;
+ }
+}
+
+ static DWRITE_RENDERING_MODE
+ToRenderingMode(int value)
+{
+ switch (value)
+ {
+ default:
+ case 0:
+ return DWRITE_RENDERING_MODE_DEFAULT;
+ case 1:
+ return DWRITE_RENDERING_MODE_ALIASED;
+ case 2:
+ return DWRITE_RENDERING_MODE_CLEARTYPE_GDI_CLASSIC;
+ case 3:
+ return DWRITE_RENDERING_MODE_CLEARTYPE_GDI_NATURAL;
+ case 4:
+ return DWRITE_RENDERING_MODE_CLEARTYPE_NATURAL;
+ case 5:
+ return DWRITE_RENDERING_MODE_CLEARTYPE_NATURAL_SYMMETRIC;
+ case 6:
+ return DWRITE_RENDERING_MODE_OUTLINE;
+ }
+}
+
+ static D2D1_TEXT_ANTIALIAS_MODE
+ToTextAntialiasMode(int value)
+{
+ switch (value)
+ {
+ default:
+ case 0:
+ return D2D1_TEXT_ANTIALIAS_MODE_DEFAULT;
+ case 1:
+ return D2D1_TEXT_ANTIALIAS_MODE_CLEARTYPE;
+ case 2:
+ return D2D1_TEXT_ANTIALIAS_MODE_GRAYSCALE;
+ case 3:
+ return D2D1_TEXT_ANTIALIAS_MODE_ALIASED;
+ }
+}
+
+ static int
+ToInt(DWRITE_RENDERING_MODE value)
+{
+ switch (value)
+ {
+ case DWRITE_RENDERING_MODE_DEFAULT:
+ return 0;
+ case DWRITE_RENDERING_MODE_ALIASED:
+ return 1;
+ case DWRITE_RENDERING_MODE_CLEARTYPE_GDI_CLASSIC:
+ return 2;
+ case DWRITE_RENDERING_MODE_CLEARTYPE_GDI_NATURAL:
+ return 3;
+ case DWRITE_RENDERING_MODE_CLEARTYPE_NATURAL:
+ return 4;
+ case DWRITE_RENDERING_MODE_CLEARTYPE_NATURAL_SYMMETRIC:
+ return 5;
+ case DWRITE_RENDERING_MODE_OUTLINE:
+ return 6;
+ default:
+ return -1;
+ }
+}
+
+class AdjustedGlyphRun : public DWRITE_GLYPH_RUN
+{
+private:
+ FLOAT mDelta;
+ FLOAT *mAdjustedAdvances;
+
+public:
+ AdjustedGlyphRun(
+ const DWRITE_GLYPH_RUN *glyphRun,
+ FLOAT cellWidth) :
+ DWRITE_GLYPH_RUN(*glyphRun),
+ mDelta(0.0f),
+ mAdjustedAdvances(new FLOAT[glyphRun->glyphCount])
+ {
+ assert(cellWidth != 0.0f);
+ for (UINT32 i = 0; i < glyphRun->glyphCount; ++i)
+ {
+ FLOAT orig = glyphRun->glyphAdvances[i];
+ FLOAT adjusted = adjustToCell(orig, cellWidth);
+ mAdjustedAdvances[i] = adjusted;
+ mDelta += adjusted - orig;
+ }
+ glyphAdvances = mAdjustedAdvances;
+ }
+
+ ~AdjustedGlyphRun(void)
+ {
+ delete[] mAdjustedAdvances;
+ }
+
+ FLOAT getDelta(void) const
+ {
+ return mDelta;
+ }
+
+ static FLOAT adjustToCell(FLOAT value, FLOAT cellWidth)
+ {
+ int cellCount = (int)floor(value / cellWidth + 0.5f);
+ if (cellCount < 1)
+ cellCount = 1;
+ return cellCount * cellWidth;
+ }
+};
+
+class GdiTextRenderer : public IDWriteTextRenderer
+{
+public:
+ GdiTextRenderer(
+ IDWriteBitmapRenderTarget* bitmapRenderTarget,
+ IDWriteRenderingParams* renderingParams) :
+ cRefCount_(0),
+ pRenderTarget_(bitmapRenderTarget),
+ pRenderingParams_(renderingParams)
+ {
+ pRenderTarget_->AddRef();
+ pRenderingParams_->AddRef();
+ AddRef();
+ }
+
+ ~GdiTextRenderer()
+ {
+ SafeRelease(&pRenderTarget_);
+ SafeRelease(&pRenderingParams_);
+ }
+
+ IFACEMETHOD(IsPixelSnappingDisabled)(
+ __maybenull void* clientDrawingContext,
+ __out BOOL* isDisabled)
+ {
+ *isDisabled = FALSE;
+ return S_OK;
+ }
+
+ IFACEMETHOD(GetCurrentTransform)(
+ __maybenull void* clientDrawingContext,
+ __out DWRITE_MATRIX* transform)
+ {
+ //forward the render target's transform
+ pRenderTarget_->GetCurrentTransform(transform);
+ return S_OK;
+ }
+
+ IFACEMETHOD(GetPixelsPerDip)(
+ __maybenull void* clientDrawingContext,
+ __out FLOAT* pixelsPerDip)
+ {
+ *pixelsPerDip = pRenderTarget_->GetPixelsPerDip();
+ return S_OK;
+ }
+
+ IFACEMETHOD(DrawGlyphRun)(
+ __maybenull void* clientDrawingContext,
+ FLOAT baselineOriginX,
+ FLOAT baselineOriginY,
+ DWRITE_MEASURING_MODE measuringMode,
+ __in DWRITE_GLYPH_RUN const* glyphRun,
+ __in DWRITE_GLYPH_RUN_DESCRIPTION const* glyphRunDescription,
+ IUnknown* clientDrawingEffect)
+ {
+ HRESULT hr = S_OK;
+
+ GdiTextRendererContext *context =
+ reinterpret_cast<GdiTextRendererContext*>(clientDrawingContext);
+
+ AdjustedGlyphRun adjustedGlyphRun(glyphRun, context->cellWidth);
+
+ // Pass on the drawing call to the render target to do the real work.
+ RECT dirtyRect = {0};
+
+ hr = pRenderTarget_->DrawGlyphRun(
+ baselineOriginX + context->offsetX,
+ baselineOriginY,
+ measuringMode,
+ &adjustedGlyphRun,
+ pRenderingParams_,
+ context->color,
+ &dirtyRect);
+
+ context->offsetX += adjustedGlyphRun.getDelta();
+
+ return hr;
+ }
+
+ IFACEMETHOD(DrawUnderline)(
+ __maybenull void* clientDrawingContext,
+ FLOAT baselineOriginX,
+ FLOAT baselineOriginY,
+ __in DWRITE_UNDERLINE const* underline,
+ IUnknown* clientDrawingEffect)
+ {
+ return E_NOTIMPL;
+ }
+
+ IFACEMETHOD(DrawStrikethrough)(
+ __maybenull void* clientDrawingContext,
+ FLOAT baselineOriginX,
+ FLOAT baselineOriginY,
+ __in DWRITE_STRIKETHROUGH const* strikethrough,
+ IUnknown* clientDrawingEffect)
+ {
+ return E_NOTIMPL;
+ }
+
+ IFACEMETHOD(DrawInlineObject)(
+ __maybenull void* clientDrawingContext,
+ FLOAT originX,
+ FLOAT originY,
+ IDWriteInlineObject* inlineObject,
+ BOOL isSideways,
+ BOOL isRightToLeft,
+ IUnknown* clientDrawingEffect)
+ {
+ return E_NOTIMPL;
+ }
+
+public:
+ IFACEMETHOD_(unsigned long, AddRef) ()
+ {
+ return InterlockedIncrement(&cRefCount_);
+ }
+
+ IFACEMETHOD_(unsigned long, Release) ()
+ {
+ long newCount = InterlockedDecrement(&cRefCount_);
+
+ if (newCount == 0)
+ {
+ delete this;
+ return 0;
+ }
+ return newCount;
+ }
+
+ IFACEMETHOD(QueryInterface)(
+ IID const& riid,
+ void** ppvObject)
+ {
+ if (__uuidof(IDWriteTextRenderer) == riid)
+ {
+ *ppvObject = this;
+ }
+ else if (__uuidof(IDWritePixelSnapping) == riid)
+ {
+ *ppvObject = this;
+ }
+ else if (__uuidof(IUnknown) == riid)
+ {
+ *ppvObject = this;
+ }
+ else
+ {
+ *ppvObject = NULL;
+ return E_FAIL;
+ }
+
+ return S_OK;
+ }
+
+private:
+ unsigned long cRefCount_;
+ IDWriteBitmapRenderTarget* pRenderTarget_;
+ IDWriteRenderingParams* pRenderingParams_;
+};
+
+struct DWriteContext {
+ FLOAT mDpiScaleX;
+ FLOAT mDpiScaleY;
+ bool mDrawing;
+
+ ID2D1Factory *mD2D1Factory;
+
+ ID2D1DCRenderTarget *mRT;
+ ID2D1SolidColorBrush *mBrush;
+
+ IDWriteFactory *mDWriteFactory;
+ IDWriteGdiInterop *mGdiInterop;
+ IDWriteRenderingParams *mRenderingParams;
+ IDWriteTextFormat *mTextFormat;
+
+ HFONT mLastHFont;
+ DWRITE_FONT_WEIGHT mFontWeight;
+ DWRITE_FONT_STYLE mFontStyle;
+
+ D2D1_TEXT_ANTIALIAS_MODE mTextAntialiasMode;
+
+ // METHODS
+
+ DWriteContext();
+
+ virtual ~DWriteContext();
+
+ HRESULT SetLOGFONT(const LOGFONTW &logFont, float fontSize);
+
+ void SetFont(HFONT hFont);
+
+ void SetFont(const LOGFONTW &logFont);
+
+ void DrawText(HDC hdc, const WCHAR* text, int len,
+ int x, int y, int w, int h, int cellWidth, COLORREF color);
+
+ float PixelsToDipsX(int x);
+
+ float PixelsToDipsY(int y);
+
+ void SetRenderingParams(
+ const DWriteRenderingParams *params);
+
+ DWriteRenderingParams *GetRenderingParams(
+ DWriteRenderingParams *params);
+};
+
+DWriteContext::DWriteContext() :
+ mDpiScaleX(1.f),
+ mDpiScaleY(1.f),
+ mDrawing(false),
+ mD2D1Factory(NULL),
+ mRT(NULL),
+ mBrush(NULL),
+ mDWriteFactory(NULL),
+ mGdiInterop(NULL),
+ mRenderingParams(NULL),
+ mTextFormat(NULL),
+ mLastHFont(NULL),
+ mFontWeight(DWRITE_FONT_WEIGHT_NORMAL),
+ mFontStyle(DWRITE_FONT_STYLE_NORMAL),
+ mTextAntialiasMode(D2D1_TEXT_ANTIALIAS_MODE_DEFAULT)
+{
+ HRESULT hr;
+
+ HDC screen = ::GetDC(0);
+ mDpiScaleX = ::GetDeviceCaps(screen, LOGPIXELSX) / 96.0f;
+ mDpiScaleY = ::GetDeviceCaps(screen, LOGPIXELSY) / 96.0f;
+ ::ReleaseDC(0, screen);
+
+ hr = D2D1CreateFactory(D2D1_FACTORY_TYPE_SINGLE_THREADED,
+ __uuidof(ID2D1Factory), NULL,
+ reinterpret_cast<void**>(&mD2D1Factory));
+ _RPT2(_CRT_WARN, "D2D1CreateFactory: hr=%p p=%p\n", hr, mD2D1Factory);
+
+ if (SUCCEEDED(hr))
+ {
+ D2D1_RENDER_TARGET_PROPERTIES props = {
+ D2D1_RENDER_TARGET_TYPE_DEFAULT,
+ { DXGI_FORMAT_B8G8R8A8_UNORM, D2D1_ALPHA_MODE_IGNORE },
+ 0, 0,
+ D2D1_RENDER_TARGET_USAGE_NONE,
+ D2D1_FEATURE_LEVEL_DEFAULT
+ };
+ hr = mD2D1Factory->CreateDCRenderTarget(&props, &mRT);
+ _RPT2(_CRT_WARN, "CreateDCRenderTarget: hr=%p p=%p\n", hr, mRT);
+ }
+
+ if (SUCCEEDED(hr))
+ {
+ hr = mRT->CreateSolidColorBrush(
+ D2D1::ColorF(D2D1::ColorF::Black),
+ &mBrush);
+ _RPT2(_CRT_WARN, "CreateSolidColorBrush: hr=%p p=%p\n", hr, mBrush);
+ }
+
+ if (SUCCEEDED(hr))
+ {
+ hr = DWriteCreateFactory(
+ DWRITE_FACTORY_TYPE_SHARED,
+ __uuidof(IDWriteFactory),
+ reinterpret_cast<IUnknown**>(&mDWriteFactory));
+ _RPT2(_CRT_WARN, "DWriteCreateFactory: hr=%p p=%p\n", hr,
+ mDWriteFactory);
+ }
+
+ if (SUCCEEDED(hr))
+ {
+ hr = mDWriteFactory->GetGdiInterop(&mGdiInterop);
+ _RPT2(_CRT_WARN, "GetGdiInterop: hr=%p p=%p\n", hr, mGdiInterop);
+ }
+
+ if (SUCCEEDED(hr))
+ {
+ hr = mDWriteFactory->CreateRenderingParams(&mRenderingParams);
+ _RPT2(_CRT_WARN, "CreateRenderingParams: hr=%p p=%p\n", hr,
+ mRenderingParams);
+ }
+}
+
+DWriteContext::~DWriteContext()
+{
+ SafeRelease(&mTextFormat);
+ SafeRelease(&mRenderingParams);
+ SafeRelease(&mGdiInterop);
+ SafeRelease(&mDWriteFactory);
+ SafeRelease(&mBrush);
+ SafeRelease(&mRT);
+ SafeRelease(&mD2D1Factory);
+}
+
+ HRESULT
+DWriteContext::SetLOGFONT(const LOGFONTW &logFont, float fontSize)
+{
+ // Most of this function is copy from: http://msdn.microsoft.com/en-us/library/windows/desktop/dd941783(v=vs.85).aspx
+ HRESULT hr = S_OK;
+
+ IDWriteFont *font = NULL;
+ IDWriteFontFamily *fontFamily = NULL;
+ IDWriteLocalizedStrings *localizedFamilyNames = NULL;
+
+ if (SUCCEEDED(hr))
+ {
+ hr = mGdiInterop->CreateFontFromLOGFONT(&logFont, &font);
+ }
+
+ // Get the font family to which this font belongs.
+ if (SUCCEEDED(hr))
+ {
+ hr = font->GetFontFamily(&fontFamily);
+ }
+
+ // Get the family names. This returns an object that encapsulates one or
+ // more names with the same meaning but in different languages.
+ if (SUCCEEDED(hr))
+ {
+ hr = fontFamily->GetFamilyNames(&localizedFamilyNames);
+ }
+
+ // Get the family name at index zero. If we were going to display the name
+ // we'd want to try to find one that matched the use locale, but for
+ // purposes of creating a text format object any language will do.
+
+ wchar_t familyName[100];
+ if (SUCCEEDED(hr))
+ {
+ hr = localizedFamilyNames->GetString(0, familyName,
+ ARRAYSIZE(familyName));
+ }
+
+ if (SUCCEEDED(hr))
+ {
+ // If no font size was passed in use the lfHeight of the LOGFONT.
+ if (fontSize == 0)
+ {
+ // Convert from pixels to DIPs.
+ fontSize = PixelsToDipsY(logFont.lfHeight);
+ if (fontSize < 0)
+ {
+ // Negative lfHeight represents the size of the em unit.
+ fontSize = -fontSize;
+ }
+ else
+ {
+ // Positive lfHeight represents the cell height (ascent +
+ // descent).
+ DWRITE_FONT_METRICS fontMetrics;
+ font->GetMetrics(&fontMetrics);
+
+ // Convert the cell height (ascent + descent) from design units
+ // to ems.
+ float cellHeight = static_cast<float>(
+ fontMetrics.ascent + fontMetrics.descent)
+ / fontMetrics.designUnitsPerEm;
+
+ // Divide the font size by the cell height to get the font em
+ // size.
+ fontSize /= cellHeight;
+ }
+ }
+ }
+
+ // The text format includes a locale name. Ideally, this would be the
+ // language of the text, which may or may not be the same as the primary
+ // language of the user. However, for our purposes the user locale will do.
+ wchar_t localeName[LOCALE_NAME_MAX_LENGTH];
+ if (SUCCEEDED(hr))
+ {
+ if (GetUserDefaultLocaleName(localeName, LOCALE_NAME_MAX_LENGTH) == 0)
+ hr = HRESULT_FROM_WIN32(GetLastError());
+ }
+
+ if (SUCCEEDED(hr))
+ {
+ // Create the text format object.
+ hr = mDWriteFactory->CreateTextFormat(
+ familyName,
+ NULL, // no custom font collection
+ font->GetWeight(),
+ font->GetStyle(),
+ font->GetStretch(),
+ fontSize,
+ localeName,
+ &mTextFormat);
+ }
+
+ if (SUCCEEDED(hr))
+ {
+ mFontWeight = static_cast<DWRITE_FONT_WEIGHT>(logFont.lfWeight);
+ mFontStyle = logFont.lfItalic ? DWRITE_FONT_STYLE_ITALIC
+ : DWRITE_FONT_STYLE_NORMAL;
+ }
+
+ SafeRelease(&localizedFamilyNames);
+ SafeRelease(&fontFamily);
+ SafeRelease(&font);
+
+ return hr;
+}
+
+ void
+DWriteContext::SetFont(HFONT hFont)
+{
+ if (mLastHFont != hFont)
+ {
+ LOGFONTW lf;
+ if (GetObjectW(hFont, sizeof(lf), &lf))
+ {
+ SetFont(lf);
+ mLastHFont = hFont;
+ }
+ }
+}
+
+ void
+DWriteContext::SetFont(const LOGFONTW &logFont)
+{
+ SafeRelease(&mTextFormat);
+ mLastHFont = NULL;
+
+ HRESULT hr = SetLOGFONT(logFont, 0.f);
+
+ if (SUCCEEDED(hr))
+ hr = mTextFormat->SetTextAlignment(DWRITE_TEXT_ALIGNMENT_LEADING);
+
+ if (SUCCEEDED(hr))
+ hr = mTextFormat->SetParagraphAlignment(
+ DWRITE_PARAGRAPH_ALIGNMENT_CENTER);
+
+ if (SUCCEEDED(hr))
+ hr = mTextFormat->SetWordWrapping(DWRITE_WORD_WRAPPING_NO_WRAP);
+}
+
+ void
+DWriteContext::DrawText(HDC hdc, const WCHAR* text, int len,
+ int x, int y, int w, int h, int cellWidth, COLORREF color)
+{
+ HRESULT hr = S_OK;
+ IDWriteBitmapRenderTarget *bmpRT = NULL;
+
+ // Skip when any fonts are not set.
+ if (mTextFormat == NULL)
+ return;
+
+ // Check possibility of zero divided error.
+ if (cellWidth == 0 || mDpiScaleX == 0.0f || mDpiScaleY == 0.0f)
+ return;
+
+ if (SUCCEEDED(hr))
+ hr = mGdiInterop->CreateBitmapRenderTarget(hdc, w, h, &bmpRT);
+
+ if (SUCCEEDED(hr))
+ {
+ IDWriteTextLayout *textLayout = NULL;
+
+ HDC memdc = bmpRT->GetMemoryDC();
+ BitBlt(memdc, 0, 0, w, h, hdc, x, y, SRCCOPY);
+
+ hr = mDWriteFactory->CreateGdiCompatibleTextLayout(
+ text, len, mTextFormat, PixelsToDipsX(w),
+ PixelsToDipsY(h), mDpiScaleX, NULL, TRUE, &textLayout);
+
+ if (SUCCEEDED(hr))
+ {
+ DWRITE_TEXT_RANGE textRange = { 0, len };
+ textLayout->SetFontWeight(mFontWeight, textRange);
+ textLayout->SetFontStyle(mFontStyle, textRange);
+ }
+
+ if (SUCCEEDED(hr))
+ {
+ GdiTextRenderer *renderer = new GdiTextRenderer(bmpRT,
+ mRenderingParams);
+ GdiTextRendererContext data = {
+ color,
+ PixelsToDipsX(cellWidth),
+ 0.0f
+ };
+ textLayout->Draw(&data, renderer, 0, 0);
+ SafeRelease(&renderer);
+ }
+
+ BitBlt(hdc, x, y, w, h, memdc, 0, 0, SRCCOPY);
+
+ SafeRelease(&textLayout);
+ }
+
+ SafeRelease(&bmpRT);
+}
+
+ float
+DWriteContext::PixelsToDipsX(int x)
+{
+ return x / mDpiScaleX;
+}
+
+ float
+DWriteContext::PixelsToDipsY(int y)
+{
+ return y / mDpiScaleY;
+}
+
+ void
+DWriteContext::SetRenderingParams(
+ const DWriteRenderingParams *params)
+{
+ if (mDWriteFactory == NULL)
+ return;
+
+ IDWriteRenderingParams *renderingParams = NULL;
+ D2D1_TEXT_ANTIALIAS_MODE textAntialiasMode =
+ D2D1_TEXT_ANTIALIAS_MODE_DEFAULT;
+ HRESULT hr;
+ if (params != NULL)
+ {
+ hr = mDWriteFactory->CreateCustomRenderingParams(params->gamma,
+ params->enhancedContrast, params->clearTypeLevel,
+ ToPixelGeometry(params->pixelGeometry),
+ ToRenderingMode(params->renderingMode), &renderingParams);
+ textAntialiasMode = ToTextAntialiasMode(params->textAntialiasMode);
+ }
+ else
+ hr = mDWriteFactory->CreateRenderingParams(&renderingParams);
+ if (SUCCEEDED(hr) && renderingParams != NULL)
+ {
+ SafeRelease(&mRenderingParams);
+ mRenderingParams = renderingParams;
+ mTextAntialiasMode = textAntialiasMode;
+ }
+}
+
+ DWriteRenderingParams *
+DWriteContext::GetRenderingParams(
+ DWriteRenderingParams *params)
+{
+ if (params != NULL && mRenderingParams != NULL)
+ {
+ params->gamma = mRenderingParams->GetGamma();
+ params->enhancedContrast = mRenderingParams->GetEnhancedContrast();
+ params->clearTypeLevel = mRenderingParams->GetClearTypeLevel();
+ params->pixelGeometry = ToInt(mRenderingParams->GetPixelGeometry());
+ params->renderingMode = ToInt(mRenderingParams->GetRenderingMode());
+ params->textAntialiasMode = mTextAntialiasMode;
+ }
+ return params;
+}
+
+////////////////////////////////////////////////////////////////////////////
+// PUBLIC C INTERFACES
+
+ void
+DWrite_Init(void)
+{
+#ifdef DYNAMIC_DIRECTX
+ // Load libraries.
+ hD2D1DLL = vimLoadLib(const_cast<char*>("d2d1.dll"));
+ hDWriteDLL = vimLoadLib(const_cast<char*>("dwrite.dll"));
+ if (hD2D1DLL == NULL || hDWriteDLL == NULL)
+ {
+ DWrite_Final();
+ return;
+ }
+ // Get address of procedures.
+ pGetUserDefaultLocaleName = (PGETUSERDEFAULTLOCALENAME)GetProcAddress(
+ GetModuleHandle("kernel32.dll"), "GetUserDefaultLocaleName");
+ pD2D1CreateFactory = (PD2D1CREATEFACTORY)GetProcAddress(hD2D1DLL,
+ "D2D1CreateFactory");
+ pDWriteCreateFactory = (PDWRITECREATEFACTORY)GetProcAddress(hDWriteDLL,
+ "DWriteCreateFactory");
+#endif
+}
+
+ void
+DWrite_Final(void)
+{
+#ifdef DYNAMIC_DIRECTX
+ pGetUserDefaultLocaleName = NULL;
+ pD2D1CreateFactory = NULL;
+ pDWriteCreateFactory = NULL;
+ unload(hDWriteDLL);
+ unload(hD2D1DLL);
+#endif
+}
+
+ DWriteContext *
+DWriteContext_Open(void)
+{
+#ifdef DYNAMIC_DIRECTX
+ if (pGetUserDefaultLocaleName == NULL || pD2D1CreateFactory == NULL
+ || pDWriteCreateFactory == NULL)
+ return NULL;
+#endif
+ return new DWriteContext();
+}
+
+ void
+DWriteContext_BeginDraw(DWriteContext *ctx)
+{
+ if (ctx != NULL && ctx->mRT != NULL)
+ {
+ ctx->mRT->BeginDraw();
+ ctx->mRT->SetTransform(D2D1::IdentityMatrix());
+ ctx->mDrawing = true;
+ }
+}
+
+ void
+DWriteContext_BindDC(DWriteContext *ctx, HDC hdc, RECT *rect)
+{
+ if (ctx != NULL && ctx->mRT != NULL)
+ {
+ ctx->mRT->BindDC(hdc, rect);
+ ctx->mRT->SetTextAntialiasMode(ctx->mTextAntialiasMode);
+ }
+}
+
+ void
+DWriteContext_SetFont(DWriteContext *ctx, HFONT hFont)
+{
+ if (ctx != NULL)
+ {
+ ctx->SetFont(hFont);
+ }
+}
+
+ void
+DWriteContext_DrawText(
+ DWriteContext *ctx,
+ HDC hdc,
+ const WCHAR* text,
+ int len,
+ int x,
+ int y,
+ int w,
+ int h,
+ int cellWidth,
+ COLORREF color)
+{
+ if (ctx != NULL)
+ ctx->DrawText(hdc, text, len, x, y, w, h, cellWidth, color);
+}
+
+ void
+DWriteContext_EndDraw(DWriteContext *ctx)
+{
+ if (ctx != NULL && ctx->mRT != NULL)
+ {
+ ctx->mRT->EndDraw();
+ ctx->mDrawing = false;
+ }
+}
+
+ void
+DWriteContext_Close(DWriteContext *ctx)
+{
+ delete ctx;
+}
+
+ void
+DWriteContext_SetRenderingParams(
+ DWriteContext *ctx,
+ const DWriteRenderingParams *params)
+{
+ if (ctx != NULL)
+ ctx->SetRenderingParams(params);
+}
+
+ DWriteRenderingParams *
+DWriteContext_GetRenderingParams(
+ DWriteContext *ctx,
+ DWriteRenderingParams *params)
+{
+ if (ctx != NULL)
+ return ctx->GetRenderingParams(params);
+ else
+ return NULL;
+}