Add initial directwrite to svg conversion.

src/fonts/directx/DirectWriteHelpers.h

@@ -0,0 +1,90 @@
+#pragma once
+
+#include "FontGlyph.h"
+
+#include <d2d1_1.h>
+#include <dwrite.h>
+
+#include <memory>
+
+static const IID IID_IGlyphOutlineGeometrySink = { 0xaaf6ab8d, 0xd6cf, 0x4a3b, { 0xa6, 0x7a, 0x12, 0xf1, 0x42, 0xe0, 0x6b, 0xb9 } };
+class IGlyphOutlineGeometrySink : public IDWriteGeometrySink
+{
+public:
+    virtual std::unique_ptr<GlyphRunOutlines> getGlypyRunOutline() = 0;
+};
+
+class GlyphOutlineGeometrySink :public IGlyphOutlineGeometrySink
+{
+public:
+    GlyphOutlineGeometrySink();
+
+    // IUnknown
+    virtual HRESULT __stdcall QueryInterface(const IID& iid, void** ppv);
+    virtual ULONG __stdcall AddRef();
+    virtual ULONG __stdcall Release();
+
+    static IUnknown* Create();
+
+    // IDWriteGeometrySink aka ID2D1SimplifiedGeometrySink
+    STDMETHOD_(void, SetFillMode)(D2D1_FILL_MODE fillMode);
+
+    STDMETHOD_(void, SetSegmentFlags)(D2D1_PATH_SEGMENT vertexFlags);
+
+    STDMETHOD_(void, BeginFigure)(D2D1_POINT_2F startPoint, D2D1_FIGURE_BEGIN figureBegin);
+
+    STDMETHOD_(void, AddLines)(_In_reads_(pointsCount) CONST D2D1_POINT_2F* points, UINT32 pointsCount);
+
+    STDMETHOD_(void, AddBeziers)(_In_reads_(beziersCount) CONST D2D1_BEZIER_SEGMENT* beziers, UINT32 beziersCount);
+
+    STDMETHOD_(void, EndFigure)(D2D1_FIGURE_END figureEnd);
+
+    STDMETHOD(Close)();
+
+    // IGlyphOutlineGeometrySink
+    std::unique_ptr<GlyphRunOutlines> getGlypyRunOutline() override;
+private:
+    std::unique_ptr<GlyphRunOutlines> mGlyphRunOutline;
+    long mRefCount{ 0 };
+};
+
+
+static const IID IID_IOffScreenTextRenderer = { 0xa43b0c49, 0x6080, 0x4731, { 0xa8, 0x72, 0x61, 0x50, 0x47, 0x3, 0x78, 0x10 } };
+class IOffScreenTextRenderer : public IDWriteTextRenderer
+{
+    virtual std::unique_ptr<GlyphRunOutlines> getGlypyRunOutline() = 0;
+};
+
+class OffScreenTextRenderer :public IOffScreenTextRenderer
+{
+public:
+    // IUnknown
+    virtual HRESULT __stdcall QueryInterface(const IID& iid, void** ppv);
+    virtual ULONG __stdcall AddRef();
+    virtual ULONG __stdcall Release();
+
+    static IUnknown* Create();
+
+    STDMETHOD(DrawGlyphRun)(_In_opt_ void* clientDrawingContext, FLOAT baselineOriginX, FLOAT baselineOriginY, DWRITE_MEASURING_MODE measuringMode,
+        _In_ DWRITE_GLYPH_RUN const* glyphRun, _In_ DWRITE_GLYPH_RUN_DESCRIPTION const* glyphRunDescription, _In_opt_ IUnknown* clientDrawingEffect);
+
+    STDMETHOD(DrawUnderline)(_In_opt_ void* clientDrawingContext, FLOAT baselineOriginX, FLOAT baselineOriginY, _In_ DWRITE_UNDERLINE const* underline, 
+        _In_opt_ IUnknown* clientDrawingEffect);
+
+    STDMETHOD(DrawStrikethrough)(_In_opt_ void* clientDrawingContext, FLOAT baselineOriginX, FLOAT baselineOriginY, _In_ DWRITE_STRIKETHROUGH const* strikethrough,
+        _In_opt_ IUnknown* clientDrawingEffect);
+
+    STDMETHOD(DrawInlineObject)(_In_opt_ void* clientDrawingContext, FLOAT originX, FLOAT originY, _In_ IDWriteInlineObject* inlineObject,
+        BOOL isSideways, BOOL isRightToLeft, _In_opt_ IUnknown* clientDrawingEffect);
+
+    STDMETHOD(IsPixelSnappingDisabled)(_In_opt_ void* clientDrawingContext, _Out_ BOOL* isDisabled);
+
+    STDMETHOD(GetCurrentTransform)(_In_opt_ void* clientDrawingContext, _Out_ DWRITE_MATRIX* transform);
+
+    STDMETHOD(GetPixelsPerDip)(_In_opt_ void* clientDrawingContext, _Out_ FLOAT* pixelsPerDip);
+
+    std::unique_ptr<GlyphRunOutlines> getGlypyRunOutline() override;
+private:
+    std::unique_ptr<GlyphRunOutlines> mGlyphRunOutline;
+    long mRefCount{ 0 };
+};