[Git][freetype/freetype-demos][master] [ftsdf] Fix segmentation fault.

[Anuj Verma (@anujv)]

Anuj Verma pushed to branch master at FreeType / FreeType Demo Programs

Commits:

• 134db7bb
  by Anuj Verma at 2022-03-24T09:53:53+05:30

  [ftsdf] Fix segmentation fault.
  
  * src/ftsdf.c (draw): Use integer to avoid overflow while reverse
  looping `j`.
  

1 changed file:

• src/ftsdf.c

Changes:

src/ftsdf.c

---

...	...	@@ -523,24 +523,24 @@
523	523
524	524	/* Finally loop over all pixels inside the draw region */
525	525	/* and copy pixels from the sample region to the draw region. */
526		- for ( FT_UInt j = (FT_UInt)( draw_region.yMax - 1 ),
527		- y = (FT_UInt)sample_region.yMin;
	526	+ for ( FT_Int j = (FT_UInt)( draw_region.yMax - 1 ),
	527	+ y = (FT_UInt)sample_region.yMin;
528	528	j >= draw_region.yMin;
529	529	j--, y++ )
530	530	{
531		- for ( FT_UInt i = (FT_UInt)draw_region.xMin,
532		- x = (FT_UInt)sample_region.xMin;
	531	+ for ( FT_Int i = (FT_UInt)draw_region.xMin,
	532	+ x = (FT_UInt)sample_region.xMin;
533	533	i < draw_region.xMax;
534	534	i++, x++ )
535	535	{
536		- FT_UInt display_index = j * (FT_UInt)display->bitmap->width + i;
537		- float min_dist;
	536	+ FT_Int display_index = j * (FT_UInt)display->bitmap->width + i;
	537	+ float min_dist;
538	538
539	539
540	540	if ( status.nearest_filtering )
541	541	{
542		- FT_UInt bitmap_index = ( y / status.scale ) * bitmap->width +
543		- x / status.scale;
	542	+ FT_Int bitmap_index = ( y / status.scale ) * bitmap->width +
	543	+ x / status.scale;
544	544	FT_Byte pixel_value = buffer[bitmap_index];
545	545
546	546

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