[Git][freetype/freetype-demos][master] * src/ftgrid.c (event_grid_zoom): Limit relative zooming.

[Alexei Podtelezhnikov (@apodtele)]

Alexei Podtelezhnikov pushed to branch master at FreeType / FreeType Demo Programs

Commits:

• 03047ba3
  by Alexei Podtelezhnikov (Алексей Подтележников) at 2024-12-14T21:20:05-05:00

   * src/ftgrid.c (event_grid_zoom): Limit relative zooming.
  

1 changed file:

• src/ftgrid.c

Changes:

src/ftgrid.c

---

...	...	@@ -1074,16 +1074,21 @@
1074	1074	{
1075	1075	int frc, exp;
1076	1076
1077		- /* The floating scale is reversibly adjusted after decomposing it into */
1078		- /* fraction and exponent. Direct bit manipulation is less portable. */
	1077	+
	1078	+ if ( ( step > 0 && status.scale > 8.0f * status.scale_0 ) ||
	1079	+ ( step < 0 && status.scale * 8.0f < status.scale_0 ) )
	1080	+ return;
	1081	+
	1082	+ /* The floating scale is reversibly adjusted after decomposing it */
	1083	+ /* into fraction and exponent, meanwhile truncating the fraction. */
	1084	+ /* Direct bit manipulation in floats is less portable. */
1079	1085	frc = (int)( 8.0f * frexpf( status.scale, &exp ) );
1080	1086
1081	1087	frc += step;
1082	1088	exp += ( frc >> 2 ) - 1;
1083	1089	frc = ( frc & 3 ) | 4;
1084	1090
1085		- if ( -8 < exp && exp <= 8 )
1086		- status.scale = ldexpf( 0.125f * frc, exp );
	1091	+ status.scale = ldexpf( 0.125f * frc, exp );
1087	1092	}
1088	1093
1089	1094

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