GLYPHDATA structure

The GLYPHDATA structure contains information about an individual glyph.

Syntax


typedef struct _GLYPHDATA {
  GLYPHDEF gdf;
  HGLYPH   hg;
  FIX      fxD;
  FIX      fxA;
  FIX      fxAB;
  FIX      fxInkTop;
  FIX      fxInkBottom;
  RECTL    rclInk;
  POINTQF  ptqD;
} GLYPHDATA;

Members

gdf

Specifies a GLYPHDEF union that contains a pointer to either a GLYPHBITS structure or a PATHOBJ structure, depending on whether, respectively, the glyph data is in the form of a bitmap or an outline.

hg

Handle to the glyph.

fxD

Specifies a FIX value containing the character increment amount, D = A + B + C. The character increment amount represents the sum of the prebearing, or left sidebearing amount (A), the width of the glyph (B), and the width of the right sidebearing amount (C). The two sidebearing amounts represent the (usually) empty space immediately to the left and right of the glyph. The value stored in fxD is the dot product of D and a unit vector along the baseline (in device coordinates), yielding the projection of D onto the baseline.

fxA

Specifies a FIX value containing the prebearing, or left sidebearing amount, A. The value stored in fxA is the dot product of A and a unit vector along the baseline (in device coordinates), yielding the projection of A onto the baseline.

fxAB

Specifies a FIX value containing the advancing edge of the character, A + B. The value stored in fxAB is the dot product of A + B and a unit vector along the baseline (in device coordinates), yielding the projection of A + B onto the baseline.

fxInkTop

Specifies a FIX value containing the distance between the baseline and the ink box top along a unit vector in the ascent direction (in device coordinates).

fxInkBottom

Specifies a FIX value containing the distance between the baseline and the ink box bottom along a unit vector in the ascent direction (in device coordinates).

rclInk

Specifies a RECTL structure that describes the ink box in which the glyph fits. The sides of the ink box are parallel to the x and y axes.

ptqD

Specifies a POINTQF structure that contains the character increment vector, D = A + B + C. The high-order WORDs of ptqD are 28.4 device coordinates. The low-order WORDs of this member provide additional precision. For a description of the POINTQF structure, see GDI Data Types.

Remarks

The quantities A, B, and C mentioned in the descriptions of GLYPHDATA members are simple tranforms of the notional space versions into 28.4 device coordinates. A is the left sidebearing amount, the width of the space to the left of the glyph, B is the width of the glyph, and C is the right sidebearing amount, the width of the space to the right of the glyph. For some glyphs, A and/or C can be negative, indicating that the glyph extends farther to the left and/or right than is usually the case.

For a description of the FIX data type, see GDI Data Types.

Requirements

Header

Winddi.h (include Winddi.h)

See also

GLYPHDEF
GLYPHBITS
PATHOBJ

 

 

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