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[paint-extents] Comments

This commit is contained in:
Behdad Esfahbod 2022-12-24 10:15:47 -07:00
parent 988ca459f3
commit aba2063c22
1 changed files with 7 additions and 0 deletions
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7
src/hb-paint-extents.hh
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@ -29,6 +29,12 @@
#include "hb-paint.hh" #include "hb-paint.hh"
#include "hb-draw.h" #include "hb-draw.h"
/*
* This file implements bounds-extraction as well as boundedness
* computation of COLRv1 fonts as described in:
*
* https://learn.microsoft.com/en-us/typography/opentype/spec/colr#glyph-metrics-and-boundedness
*/
typedef struct hb_extents_t typedef struct hb_extents_t
{ {
@ -240,6 +246,7 @@ struct hb_paint_extents_context_t {
const hb_bounds_t src_bounds = groups.pop (); const hb_bounds_t src_bounds = groups.pop ();
hb_bounds_t &backdrop_bounds = groups.tail (); hb_bounds_t &backdrop_bounds = groups.tail ();
// https://learn.microsoft.com/en-us/typography/opentype/spec/colr#format-32-paintcomposite
switch ((int) mode) switch ((int) mode)
{ {
case HB_PAINT_COMPOSITE_MODE_CLEAR: case HB_PAINT_COMPOSITE_MODE_CLEAR: