117 lines
3.6 KiB
C++
117 lines
3.6 KiB
C++
///// FastTextImager
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//
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// Handles common case string measurement and display
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const INT FAST_TEXT_PREALLOCATED_CHARACTERS = 64;
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typedef AutoBuffer<UINT16, FAST_TEXT_PREALLOCATED_CHARACTERS> Uint16StackBuffer;
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typedef AutoBuffer<INT, FAST_TEXT_PREALLOCATED_CHARACTERS> IntStackBuffer;
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class FastTextImager
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{
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public:
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GpStatus Initialize(
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GpGraphics *graphics,
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const WCHAR *string,
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INT length,
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const RectF &layoutRectangle,
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const GpFontFamily *family,
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INT style,
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REAL emSize, // Preconverted to world units
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const GpStringFormat *format,
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const GpBrush *brush
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);
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GpStatus MeasureString(
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RectF *boundingBox,
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INT *codepointsFitted,
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INT *linesFilled
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);
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GpStatus DrawString();
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private:
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GpStatus RemoveHotkeys();
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GpStatus FastLayoutString();
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GpStatus DrawFontStyleLine(
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const PointF *baselineOrigin, // base line origin in device unit
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REAL baselineLength, // base line length in device unit
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INT style // font styles
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);
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void FastAdjustGlyphPositionsProportional(
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IN const INT *hintedWidth, // 28.4 device
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OUT INT *x, // 28.4 device Initial x
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OUT IntStackBuffer &dx, // 32.0 device Glyph advances
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OUT const UINT16 **displayGlyphs, // First displayable glyph
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OUT INT *displayGlyphCount,
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OUT INT *leadingBlankCount
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);
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void GetWorldTextRectangleOrigin(
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PointF &origin
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);
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void GetDeviceBaselineOrigin(
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IN GpFaceRealization &faceRealization,
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OUT PointF &origin
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);
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GpStatus FastDrawGlyphsGridFit(
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GpFaceRealization &faceRealization
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);
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GpStatus FastDrawGlyphsNominal(
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GpFaceRealization &faceRealization
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);
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// Initialisation parameters
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GpGraphics *Graphics;
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const UINT16 *String;
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INT Length; // Measured, if necessary
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RectF LayoutRectangle;
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const GpFontFamily *Family;
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INT Style;
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REAL EmSize; // In world units
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const GpStringFormat *Format;
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const GpBrush *Brush;
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// Derived. All are set if Initialize succeeds
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INT FormatFlags;
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StringAlignment Alignment;
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GpFontFace *Face;
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GpMatrix WorldToDevice;
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REAL LeftMargin;
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REAL RightMargin;
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INT OverflowAvailable; // Available for advance width expansion 32.0
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REAL LeftOffset; // Allowance to reduce adjustment
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INT GlyphCount;
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REAL TotalWorldAdvance;
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GpMatrix FontTransform;
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REAL LineLengthLimit;
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REAL WorldToDeviceX;
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REAL WorldToDeviceY;
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UINT16 BlankGlyph;
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UINT16 DesignEmHeight;
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REAL CellHeight;
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INT NominalToBaselineScale; // 16.16
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TextRenderingHint TextRendering;
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INT HotkeyPosition;
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// Auto buffers common to drawing and measurement
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AutoBuffer<UINT16, FAST_TEXT_PREALLOCATED_CHARACTERS> Glyphs;
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AutoBuffer<UINT16, FAST_TEXT_PREALLOCATED_CHARACTERS> NominalWidths; // 16.0
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};
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