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[ft-paint] Implement FT_COLR_PAINTFORMAT_SKEW

This commit is contained in:
Behdad Esfahbod 2022-12-22 17:58:36 -07:00
parent 64cf17ec8b
commit cfdc34b44d
1 changed files with 20 additions and 1 deletions
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21
src/hb-ft-colr.hh
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@ -207,7 +207,26 @@ _hb_ft_paint (FT_OpaquePaint opaque_paint,
paint_funcs->pop_transform (paint_data); paint_funcs->pop_transform (paint_data);
paint_funcs->pop_transform (paint_data); paint_funcs->pop_transform (paint_data);
} }
case FT_COLR_PAINTFORMAT_SKEW: break; break;
case FT_COLR_PAINTFORMAT_SKEW:
{
float x = +tanf (paint.u.skew.x_skew_angle / 65536.f * (float) M_PI);
float y = -tanf (paint.u.skew.y_skew_angle / 65536.f * (float) M_PI);
paint_funcs->push_transform (paint_data,
1.f, 0.f, 0.f, 1.f,
+paint.u.skew.center_x / 65536.f,
+paint.u.skew.center_y / 65536.f);
paint_funcs->push_transform (paint_data, 1., y, x, 1., 0., 0.);
paint_funcs->push_transform (paint_data,
1.f, 0.f, 0.f, 1.f,
-paint.u.skew.center_x / 65536.f,
-paint.u.skew.center_y / 65536.f);
paint_recurse (paint.u.skew.paint);
paint_funcs->pop_transform (paint_data);
paint_funcs->pop_transform (paint_data);
paint_funcs->pop_transform (paint_data);
}
break;
case FT_COLR_PAINTFORMAT_COMPOSITE: case FT_COLR_PAINTFORMAT_COMPOSITE:
{ {
paint_funcs->push_group (paint_data); paint_funcs->push_group (paint_data);