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[paint] Add internal push_rotate/pop_rotate API

This commit is contained in:
Behdad Esfahbod 2022-12-31 11:35:39 -07:00
parent ce7835124a
commit 46adf31b4c
3 changed files with 23 additions and 12 deletions
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6
src/hb-ft-colr.hh
View File

@ -361,14 +361,12 @@ _hb_ft_paint (hb_ft_paint_context_t *c,
float dx = paint.u.rotate.center_x / 65536.f;
float dy = paint.u.rotate.center_y / 65536.f;
float a = paint.u.rotate.angle / 65536.f;
float cc = cosf (a * (float) M_PI);
float ss = sinf (a * (float) M_PI);
c->funcs->push_translate (c->data, +dx, +dy);
c->funcs->push_transform (c->data, cc, ss, -ss, cc, 0., 0.);
c->funcs->push_rotate (c->data, a);
c->funcs->push_translate (c->data, -dx, -dy);
c->recurse (paint.u.rotate.paint);
c->funcs->pop_translate (c->data, -dx, -dy);
c->funcs->pop_transform (c->data);
c->funcs->pop_rotate (c->data, a);
c->funcs->pop_translate (c->data, +dx, +dy);
}
break;

12
src/hb-ot-color-colr-table.hh
View File

@ -1078,11 +1078,9 @@ struct PaintRotate
void paint_glyph (hb_paint_context_t *c, uint32_t varIdxBase) const
{
float a = angle.to_float (c->instancer (varIdxBase, 0));
float cc = cosf (a * (float) M_PI);
float ss = sinf (a * (float) M_PI);
c->funcs->push_transform (c->data, cc, ss, -ss, cc, 0., 0.);
c->funcs->push_rotate (c->data, a);
c->recurse (this+src);
c->funcs->pop_transform (c->data);
c->funcs->pop_rotate (c->data, a);
}
HBUINT8 format; /* format = 24 (noVar) or 25(Var) */
@ -1114,16 +1112,14 @@ struct PaintRotateAroundCenter
void paint_glyph (hb_paint_context_t *c, uint32_t varIdxBase) const
{
float a = angle.to_float (c->instancer (varIdxBase, 0));
float cc = cosf (a * (float) M_PI);
float ss = sinf (a * (float) M_PI);
float tCenterX = centerX + c->instancer (varIdxBase, 1);
float tCenterY = centerY + c->instancer (varIdxBase, 2);
c->funcs->push_translate (c->data, +tCenterX, +tCenterY);
c->funcs->push_transform (c->data, cc, ss, -ss, cc, 0., 0.);
c->funcs->push_rotate (c->data, a);
c->funcs->push_translate (c->data, -tCenterX, -tCenterY);
c->recurse (this+src);
c->funcs->pop_translate (c->data, -tCenterX, -tCenterY);
c->funcs->pop_transform (c->data);
c->funcs->pop_rotate (c->data, a);
c->funcs->pop_translate (c->data, +tCenterX, +tCenterY);
}

17
src/hb-paint.hh
View File

@ -201,6 +201,23 @@ struct hb_paint_funcs_t
if (sx != 1.f || sy != 1.f)
pop_transform (paint_data);
}
void push_rotate (void *paint_data,
float a)
{
if (a)
{
float cc = cosf (a * (float) M_PI);
float ss = sinf (a * (float) M_PI);
push_transform (paint_data, cc, ss, -ss, cc, 0.f, 0.f);
}
}
void pop_rotate (void *paint_data,
float a)
{
if (a)
pop_transform (paint_data);
}
};
DECLARE_NULL_INSTANCE (hb_paint_funcs_t);