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(PT_PER_INCH): New macro.

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(xlfd_point_size): Compute real point size from font's pixel size.
(pixel_point_size, build_scalable_font_name): Use PT_PER_INCH
instead of 72.
This commit is contained in:
Gerd Moellmann 2000-12-27 16:54:09 +00:00
parent 6a46357a1b
commit c660ce4ec4
1 changed files with 12 additions and 8 deletions
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20
src/xfaces.c
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@ -287,6 +287,10 @@ x_free_gc (f, gc)
#define abs(X) ((X) < 0 ? -(X) : (X))
#endif
/* Number of pt per inch (from the TeXbook). */
#define PT_PER_INCH 72.27
/* Non-zero if face attribute ATTR is unspecified. */
#define UNSPECIFIEDP(ATTR) EQ ((ATTR), Qunspecified)
@ -2105,14 +2109,13 @@ xlfd_point_size (f, font)
struct font_name *font;
{
double resy = FRAME_X_DISPLAY_INFO (f)->resy;
double font_resy = atoi (font->fields[XLFD_RESY]);
double font_pt = atoi (font->fields[XLFD_POINT_SIZE]);
double font_pixel = atoi (font->fields[XLFD_PIXEL_SIZE]);
int real_pt;
if (font_resy == 0 || font_pt == 0)
if (font_pixel == 0)
real_pt = 0;
else
real_pt = (font_resy / resy) * font_pt + 0.5;
real_pt = PT_PER_INCH * 10.0 * font_pixel / resy + 0.5;
return real_pt;
}
@ -2131,8 +2134,9 @@ pixel_point_size (f, pixel)
double real_pt;
int int_pt;
/* As one inch is 72 points, 72/RESY gives the point size of one dot. */
real_pt = pixel * 72 / resy;
/* As one inch is PT_PER_INCH points, PT_PER_INCH/RESY gives the
point size of one dot. */
real_pt = pixel * PT_PER_INCH / resy;
int_pt = real_pt + 0.5;
return int_pt;
@ -5774,12 +5778,12 @@ build_scalable_font_name (f, font, specified_pt)
if (font->numeric[XLFD_RESY] != 0)
{
pt = resy / font->numeric[XLFD_RESY] * specified_pt + 0.5;
pixel_value = font->numeric[XLFD_RESY] / 720.0 * pt;
pixel_value = font->numeric[XLFD_RESY] / (PT_PER_INCH * 10.0) * pt;
}
else
{
pt = specified_pt;
pixel_value = resy / 720.0 * pt;
pixel_value = resy / (PT_PER_INCH * 10.0) * pt;
}
/* Set point size of the font. */