The GetCharABCWidths function retrieves the widths, in logical units, of consecutive characters in a given range from the current TrueType font. This function succeeds only with TrueType fonts.
BOOL GetCharABCWidths(
HDC hdc, |
// handle of device context |
UINT uFirstChar, |
// first character in range to query |
UINT uLastChar, |
// last character in range to query |
LPABC lpabc |
// address of character-width structure |
); |
If the function succeeds, the return value is nonzero
If the function fails, the return value is zero. To get extended error information, call GetLastError.
The TrueType rasterizer provides ABC character spacing after a specific point size has been selected. “A” spacing is the distance added to the current position before placing the glyph. “B” spacing is the width of the black part of the glyph. “C” spacing is the distance added to the current position to provide white space to the right of the glyph. The total advanced width is given by A+B+C.
When the GetCharABCWidths function retrieves negative “A” or “C” widths for a character, that character includes underhangs or overhangs.
To convert the ABC widths to font design units, an application should use the value stored in the otmEMSquare member of a OUTLINETEXTMETRIC structure. This value can be retrieved by calling the GetOutlineTextMetrics function.
The ABC widths of the default character are used for characters outside the range of the currently selected font.
To retrieve the widths of characters in non-TrueType fonts, applications should use the GetCharWidth function.
GetCharWidth, GetOutlineTextMetrics, OUTLINETEXTMETRIC, ABC
See:
file: /Techref/os/win/api/win32/func/src/f27_16.htm, 4KB, , updated: 2001/6/26 11:28, local time: 2024/8/23 03:21,
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