vim/src/gui_dwrite.cpp at master · vim/vim · GitHub

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/* vi:set ts=8 sts=4 sw=4 noet: */

* Author: MURAOKA Taro <koron.kaoriya@gmail.com>

* Contributors:

* - Ken Takata

* - Yasuhiro Matsumoto

* 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>

// Disable these macros to compile with old VC and newer SDK (V8.1 or later).

#if defined(_MSC_VER) && (_MSC_VER < 1700)

# define _COM_Outptr_ __out

# define _In_reads_(s)

# define _In_reads_opt_(s)

# define _Maybenull_

# define _Out_writes_(s)

# define _Out_writes_opt_(s)

# define _Out_writes_to_(x, y)

# define _Out_writes_to_opt_(x, y)

# define _Outptr_

#endif

#ifdef FEAT_DIRECTX_COLOR_EMOJI

# include <dwrite_2.h>

#else

# include <dwrite.h>

#endif

#include "gui_dwrite.h"

#ifdef __MINGW32__

# define __maybenull SAL__maybenull

# define __in SAL__in

# define __out SAL__out

#endif

#ifdef __MINGW32__

# define UNUSED __attribute__((unused))

#else

# define UNUSED

#endif

#if (defined(_MSC_VER) && (_MSC_VER >= 1700)) || (__cplusplus >= 201103L)

# define FINAL final

#else

# define FINAL

#endif

#ifdef DYNAMIC_DIRECTX

extern "C" HINSTANCE vimLoadLib(const 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;

}

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 FontCache {

public:

struct Item {

HFONT hFont;

IDWriteTextFormat* pTextFormat;

DWRITE_FONT_WEIGHT fontWeight;

DWRITE_FONT_STYLE fontStyle;

FLOAT fontAscent;

Item() : hFont(NULL), pTextFormat(NULL), fontAscent(0.0f) {}

};

private:

int mSize;

Item *mItems;

public:

FontCache(int size = 2) :

mSize(size),

mItems(new Item[size])

{

}

~FontCache()

{

for (int i = 0; i < mSize; ++i)

SafeRelease(&mItems[i].pTextFormat);

delete[] mItems;

}

bool get(HFONT hFont, Item &item)

{

int n = find(hFont);

if (n < 0)

return false;

item = mItems[n];

slide(n);

return true;

}

void put(const Item& item)

{

int n = find(item.hFont);

if (n < 0)

n = mSize - 1;

if (mItems[n].pTextFormat != item.pTextFormat)

{

SafeRelease(&mItems[n].pTextFormat);

if (item.pTextFormat != NULL)

item.pTextFormat->AddRef();

}

mItems[n] = item;

slide(n);

}

private:

int find(HFONT hFont)

{

for (int i = 0; i < mSize; ++i)

{

if (mItems[i].hFont == hFont)

return i;

}

return -1;

}

void slide(int nextTop)

{

if (nextTop == 0)

return;

Item tmp = mItems[nextTop];

for (int i = nextTop - 1; i >= 0; --i)

mItems[i + 1] = mItems[i];

mItems[0] = tmp;

}

};

enum DrawingMode {

DM_GDI = 0,

DM_DIRECTX = 1,

DM_INTEROP = 2,

};

struct DWriteContext {

HDC mHDC;

RECT mBindRect;

DrawingMode mDMode;

HDC mInteropHDC;

bool mDrawing;

bool mFallbackDC;

ID2D1Factory *mD2D1Factory;

ID2D1DCRenderTarget *mRT;

ID2D1GdiInteropRenderTarget *mGDIRT;

ID2D1SolidColorBrush *mBrush;

ID2D1Bitmap *mBitmap;

IDWriteFactory *mDWriteFactory;

#ifdef FEAT_DIRECTX_COLOR_EMOJI

IDWriteFactory2 *mDWriteFactory2;

#endif

IDWriteGdiInterop *mGdiInterop;

IDWriteRenderingParams *mRenderingParams;

FontCache mFontCache;

IDWriteTextFormat *mTextFormat;

DWRITE_FONT_WEIGHT mFontWeight;

DWRITE_FONT_STYLE mFontStyle;

FLOAT mFontSize; // Font size in pixels (em height)

FLOAT mFontAscent; // Font ascent in pixels

D2D1_TEXT_ANTIALIAS_MODE mTextAntialiasMode;

DWriteFontFeature mFontFeatures[DWRITE_MAX_FONT_FEATURES];

int mFontFeatureCount;

// METHODS

DWriteContext();

virtual ~DWriteContext();

HRESULT CreateDeviceResources();

void DiscardDeviceResources();

HRESULT CreateTextFormatFromLOGFONT(const LOGFONTW &logFont,

IDWriteTextFormat **ppTextFormat, FLOAT *pFontAscent);

HRESULT SetFontByLOGFONT(const LOGFONTW &logFont);

void SetFont(HFONT hFont);

void Rebind();

void BindDC(HDC hdc, const RECT *rect);

HRESULT SetDrawingMode(DrawingMode mode);

ID2D1Brush* SolidBrush(COLORREF color);

void DrawText(const WCHAR *text, int len,

int x, int y, int w, int h, int cellWidth, COLORREF color,

UINT fuOptions, const RECT *lprc, const INT *lpDx);

void FillRect(const RECT *rc, COLORREF color);

void DrawLine(int x1, int y1, int x2, int y2, COLORREF color);

void SetPixel(int x, int y, COLORREF color);

void Scroll(int x, int y, const RECT *rc);

void Flush();

void SetRenderingParams(

const DWriteRenderingParams *params);

DWriteRenderingParams *GetRenderingParams(

DWriteRenderingParams *params);

void SetFontFeatures(const DWriteFontFeature *features, int count);

};

class AdjustedGlyphRun : public DWRITE_GLYPH_RUN

{

private:

FLOAT &mAccum;

FLOAT mDelta;

FLOAT *mAdjustedAdvances;

public:

AdjustedGlyphRun(

const DWRITE_GLYPH_RUN *glyphRun,

FLOAT cellWidth,

FLOAT &accum,

const INT *lpDx,

int *glyphIndex,

int cchText) :

DWRITE_GLYPH_RUN(*glyphRun),

mAccum(accum),

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;

if (*glyphIndex < cchText)

{

adjusted = FLOAT(lpDx[*glyphIndex]);

(*glyphIndex)++;

}

else

{

adjusted = adjustToCell(orig, cellWidth);

}

mAdjustedAdvances[i] = adjusted;

mDelta += adjusted - orig;

}

glyphAdvances = mAdjustedAdvances;

}

~AdjustedGlyphRun()

{

mAccum += mDelta;

delete[] mAdjustedAdvances;

}

static FLOAT adjustToCell(FLOAT value, FLOAT cellWidth)

{

int cellCount = int(floor(value / cellWidth + 0.5f));

if (cellCount < 1)

cellCount = 1;

return cellCount * cellWidth;

}

};

struct TextRendererContext {

// const fields.

COLORREF color;

FLOAT cellWidth;

const INT *lpDx;

int cchText;

FLOAT baselineY; // Fixed baseline Y coordinate

// working fields.

FLOAT offsetX;

int glyphIndex;

};

class TextRenderer FINAL : public IDWriteTextRenderer

{

public:

TextRenderer(

DWriteContext* pDWC) :

cRefCount_(0),

pDWC_(pDWC)

{

AddRef();

}

// add "virtual" to avoid a compiler warning

virtual ~TextRenderer()

{

}

IFACEMETHOD(IsPixelSnappingDisabled)(

__maybenull void* clientDrawingContext UNUSED,

__out BOOL* isDisabled)

{

*isDisabled = FALSE;

return S_OK;

}

IFACEMETHOD(GetCurrentTransform)(

__maybenull void* clientDrawingContext UNUSED,

__out DWRITE_MATRIX* transform)

{

// forward the render target's transform

pDWC_->mRT->GetTransform(

reinterpret_cast<D2D1_MATRIX_3X2_F*>(transform));

return S_OK;

}

IFACEMETHOD(GetPixelsPerDip)(

__maybenull void* clientDrawingContext UNUSED,

__out FLOAT* pixelsPerDip)

{

float dpiX, unused;

pDWC_->mRT->GetDpi(&dpiX, &unused);

*pixelsPerDip = dpiX / 96.0f;

return S_OK;

}

IFACEMETHOD(DrawUnderline)(

__maybenull void* clientDrawingContext UNUSED,

FLOAT baselineOriginX UNUSED,

FLOAT baselineOriginY UNUSED,

__in DWRITE_UNDERLINE const* underline UNUSED,

IUnknown* clientDrawingEffect UNUSED)

{

return E_NOTIMPL;

}

IFACEMETHOD(DrawStrikethrough)(

__maybenull void* clientDrawingContext UNUSED,

FLOAT baselineOriginX UNUSED,

FLOAT baselineOriginY UNUSED,

__in DWRITE_STRIKETHROUGH const* strikethrough UNUSED,

IUnknown* clientDrawingEffect UNUSED)

{

return E_NOTIMPL;

}

IFACEMETHOD(DrawInlineObject)(

__maybenull void* clientDrawingContext UNUSED,

FLOAT originX UNUSED,

FLOAT originY UNUSED,

IDWriteInlineObject* inlineObject UNUSED,

BOOL isSideways UNUSED,

BOOL isRightToLeft UNUSED,

IUnknown* clientDrawingEffect UNUSED)

{

return E_NOTIMPL;

}

IFACEMETHOD(DrawGlyphRun)(

__maybenull void* clientDrawingContext,

FLOAT baselineOriginX,

FLOAT baselineOriginY,

DWRITE_MEASURING_MODE measuringMode UNUSED,

__in DWRITE_GLYPH_RUN const* glyphRun,

__in DWRITE_GLYPH_RUN_DESCRIPTION const* glyphRunDescription UNUSED,

IUnknown* clientDrawingEffect UNUSED)

{

TextRendererContext *context =

reinterpret_cast<TextRendererContext*>(clientDrawingContext);

// Use fixed baseline Y from context instead of DirectWrite's

// baselineOriginY to prevent vertical shifts when font fallback

// occurs (e.g., for CJK characters).

FLOAT fixedBaselineY = context->baselineY;

AdjustedGlyphRun adjustedGlyphRun(glyphRun, context->cellWidth,

context->offsetX, context->lpDx, &context->glyphIndex,

context->cchText);

#ifdef FEAT_DIRECTX_COLOR_EMOJI

if (pDWC_->mDWriteFactory2 != NULL)

{

IDWriteColorGlyphRunEnumerator *enumerator = NULL;

HRESULT hr = pDWC_->mDWriteFactory2->TranslateColorGlyphRun(

baselineOriginX + context->offsetX,

baselineOriginY,

&adjustedGlyphRun,

NULL,

DWRITE_MEASURING_MODE_GDI_NATURAL,

NULL,

&enumerator);

if (SUCCEEDED(hr))

{

// Draw by IDWriteFactory2 for color emoji

BOOL hasRun = TRUE;

enumerator->MoveNext(&hasRun);

while (hasRun)

{

const DWRITE_COLOR_GLYPH_RUN* colorGlyphRun;

enumerator->GetCurrentRun(&colorGlyphRun);

pDWC_->mBrush->SetColor(colorGlyphRun->runColor);

pDWC_->mRT->DrawGlyphRun(

D2D1::Point2F(

colorGlyphRun->baselineOriginX,

fixedBaselineY),

&colorGlyphRun->glyphRun,

pDWC_->mBrush,

DWRITE_MEASURING_MODE_NATURAL);

enumerator->MoveNext(&hasRun);

}

SafeRelease(&enumerator);

return S_OK;

}

#endif

// Draw by IDWriteFactory (without color emoji)

pDWC_->mRT->DrawGlyphRun(

D2D1::Point2F(

baselineOriginX + context->offsetX,

fixedBaselineY),

&adjustedGlyphRun,

pDWC_->SolidBrush(context->color),

DWRITE_MEASURING_MODE_NATURAL);

return S_OK;

}

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:

long cRefCount_;

DWriteContext* pDWC_;

};

DWriteContext::DWriteContext() :

mHDC(NULL),

mBindRect(),

mDMode(DM_GDI),

mInteropHDC(NULL),

mDrawing(false),

mFallbackDC(false),

mD2D1Factory(NULL),

mRT(NULL),

mGDIRT(NULL),

mBrush(NULL),

mBitmap(NULL),

mDWriteFactory(NULL),

#ifdef FEAT_DIRECTX_COLOR_EMOJI

mDWriteFactory2(NULL),

#endif

mGdiInterop(NULL),

mRenderingParams(NULL),

mFontCache(8),

mTextFormat(NULL),

mFontWeight(DWRITE_FONT_WEIGHT_NORMAL),

mFontStyle(DWRITE_FONT_STYLE_NORMAL),

mFontSize(0.0f),

mFontAscent(0.0f),

mTextAntialiasMode(D2D1_TEXT_ANTIALIAS_MODE_DEFAULT),

mFontFeatureCount(0)

{

ZeroMemory(mFontFeatures, sizeof(mFontFeatures));

HRESULT hr;

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))

{

hr = DWriteCreateFactory(

DWRITE_FACTORY_TYPE_SHARED,

__uuidof(IDWriteFactory),

reinterpret_cast<IUnknown**>(&mDWriteFactory));

_RPT2(_CRT_WARN, "DWriteCreateFactory: hr=%p p=%p\n", hr,

mDWriteFactory);

}

#ifdef FEAT_DIRECTX_COLOR_EMOJI

if (SUCCEEDED(hr))

{

DWriteCreateFactory(

DWRITE_FACTORY_TYPE_SHARED,

__uuidof(IDWriteFactory2),

reinterpret_cast<IUnknown**>(&mDWriteFactory2));

_RPT1(_CRT_WARN, "IDWriteFactory2: %s\n", SUCCEEDED(hr) ? "available" : "not available");

}

#endif

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);

#ifdef FEAT_DIRECTX_COLOR_EMOJI

SafeRelease(&mDWriteFactory2);

#endif

SafeRelease(&mBitmap);

SafeRelease(&mBrush);

SafeRelease(&mGDIRT);

SafeRelease(&mRT);

SafeRelease(&mD2D1Factory);

}

HRESULT

DWriteContext::CreateDeviceResources()

{

HRESULT hr;

if (mRT != NULL)

return S_OK;

D2D1_RENDER_TARGET_PROPERTIES props = {

D2D1_RENDER_TARGET_TYPE_DEFAULT,

{ DXGI_FORMAT_B8G8R8A8_UNORM, D2D1_ALPHA_MODE_IGNORE },

0, 0,

D2D1_RENDER_TARGET_USAGE_GDI_COMPATIBLE,

D2D1_FEATURE_LEVEL_DEFAULT

};

hr = mD2D1Factory->CreateDCRenderTarget(&props, &mRT);

_RPT2(_CRT_WARN, "CreateDCRenderTarget: hr=%p p=%p\n", hr, mRT);

if (SUCCEEDED(hr))

{

// This always succeeds.

mRT->QueryInterface(

__uuidof(ID2D1GdiInteropRenderTarget),

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

_RPT1(_CRT_WARN, "GdiInteropRenderTarget: p=%p\n", mGDIRT);

}

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))

Rebind();

return hr;

}

void

DWriteContext::DiscardDeviceResources()

{

SafeRelease(&mBitmap);

SafeRelease(&mBrush);

SafeRelease(&mGDIRT);

SafeRelease(&mRT);

}

HRESULT

DWriteContext::CreateTextFormatFromLOGFONT(const LOGFONTW &logFont,

IDWriteTextFormat **ppTextFormat, FLOAT *pFontAscent)

{

// Most of this function is copied from: https://github.com/Microsoft/Windows-classic-samples/blob/master/Samples/Win7Samples/multimedia/DirectWrite/RenderTest/TextHelpers.cpp

HRESULT hr = S_OK;

IDWriteTextFormat *pTextFormat = NULL;

IDWriteFont *font = NULL;

IDWriteFontFamily *fontFamily = NULL;

IDWriteLocalizedStrings *localizedFamilyNames = NULL;

float fontSize = 0;

DWRITE_FONT_METRICS fontMetrics = {};

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))

{

// Use lfHeight of the LOGFONT as font size.

fontSize = float(logFont.lfHeight);

font->GetMetrics(&fontMetrics);

// Convert lfHeight to DirectWrite font size

if (fontSize < 0)

{

// Negative lfHeight represents the font's em height in pixels

fontSize = -fontSize;

}

else if (fontSize > 0)

{

// Positive lfHeight represents the font's cell height (ascent + descent)

// Convert to em height

fontSize = fontSize * float(fontMetrics.designUnitsPerEm)

/ float(fontMetrics.ascent + fontMetrics.descent + fontMetrics.lineGap);

}

// 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,

&pTextFormat);

}

if (SUCCEEDED(hr))

hr = pTextFormat->SetTextAlignment(DWRITE_TEXT_ALIGNMENT_LEADING);

if (SUCCEEDED(hr))

hr = pTextFormat->SetParagraphAlignment(

DWRITE_PARAGRAPH_ALIGNMENT_FAR);

if (SUCCEEDED(hr))

hr = pTextFormat->SetWordWrapping(DWRITE_WORD_WRAPPING_NO_WRAP);

SafeRelease(&localizedFamilyNames);

SafeRelease(&fontFamily);

SafeRelease(&font);

if (SUCCEEDED(hr))

{

*ppTextFormat = pTextFormat;

if (pFontAscent != NULL && fontMetrics.designUnitsPerEm != 0)

{

// Calculate ascent ratio (0.0 to 1.0) relative to total font height

FLOAT totalHeight = float(fontMetrics.ascent + fontMetrics.descent);

if (totalHeight != 0.0f)

*pFontAscent = float(fontMetrics.ascent) / totalHeight;

else

*pFontAscent = 0.83f; // fallback

}

else

SafeRelease(&pTextFormat);

return hr;

}

HRESULT

DWriteContext::SetFontByLOGFONT(const LOGFONTW &logFont)

{

HRESULT hr = S_OK;

IDWriteTextFormat *pTextFormat = NULL;

FLOAT fontAscent = 0.0f;

hr = CreateTextFormatFromLOGFONT(logFont, &pTextFormat, &fontAscent);

if (SUCCEEDED(hr))

{

SafeRelease(&mTextFormat);

mTextFormat = pTextFormat;

mFontWeight = static_cast<DWRITE_FONT_WEIGHT>(logFont.lfWeight);

mFontStyle = logFont.lfItalic ? DWRITE_FONT_STYLE_ITALIC

: DWRITE_FONT_STYLE_NORMAL;

mFontAscent = fontAscent;

}

return hr;

}

void

DWriteContext::SetFont(HFONT hFont)

{

FontCache::Item item;

if (mFontCache.get(hFont, item))

{

if (item.pTextFormat != NULL)

{

item.pTextFormat->AddRef();

SafeRelease(&mTextFormat);

mTextFormat = item.pTextFormat;

mFontWeight = item.fontWeight;

mFontStyle = item.fontStyle;

mFontAscent = item.fontAscent;

mFallbackDC = false;

}

else

mFallbackDC = true;

return;

}

HRESULT hr = E_FAIL;

LOGFONTW lf;

if (GetObjectW(hFont, sizeof(lf), &lf))

hr = SetFontByLOGFONT(lf);

item.hFont = hFont;

if (SUCCEEDED(hr))

{

item.pTextFormat = mTextFormat;

item.fontWeight = mFontWeight;

item.fontStyle = mFontStyle;

item.fontAscent = mFontAscent;

mFallbackDC = false;

}

else

mFallbackDC = true;

mFontCache.put(item);

}

void

DWriteContext::Rebind()

{

SafeRelease(&mBitmap);

mRT->BindDC(mHDC, &mBindRect);

mRT->SetTransform(D2D1::IdentityMatrix());

D2D1_BITMAP_PROPERTIES props = {

{DXGI_FORMAT_B8G8R8A8_UNORM, D2D1_ALPHA_MODE_IGNORE},

96.0f, 96.0f

};

mRT->CreateBitmap(

D2D1::SizeU(mBindRect.right - mBindRect.left,

mBindRect.bottom - mBindRect.top),

props, &mBitmap);

}

void

DWriteContext::BindDC(HDC hdc, const RECT *rect)

{

mHDC = hdc;

mBindRect = *rect;

if (mRT == NULL)

CreateDeviceResources();

else

{

Flush();

Rebind();

}

extern "C" void redraw_later_clear(void);

HRESULT

DWriteContext::SetDrawingMode(DrawingMode mode)

{

HRESULT hr = S_OK;

switch (mode)

{

default:

case DM_GDI:

if (mInteropHDC != NULL)

{

mGDIRT->ReleaseDC(NULL);

mInteropHDC = NULL;

}

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