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[font] Centralize glyph-extents scaling 

Needs more testing...

Some rounding was removed, namely in cff1 and cff2.
This commit is contained in:
Behdad Esfahbod 2022-12-22 07:26:14 -07:00
parent 4622be7f84
commit b0abbfd868
7 changed files with 40 additions and 32 deletions
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11
src/OT/glyf/glyf.hh
View File

@ -247,19 +247,14 @@ struct glyf_accelerator_t
extents->y_bearing = 0;
return;
}
if (scaled)
{
extents->x_bearing = font->em_scalef_x (min_x);
extents->width = font->em_scalef_x (max_x) - extents->x_bearing;
extents->y_bearing = font->em_scalef_y (max_y);
extents->height = font->em_scalef_y (min_y) - extents->y_bearing;
}
else
{
extents->x_bearing = roundf (min_x);
extents->width = roundf (max_x - extents->x_bearing);
extents->y_bearing = roundf (max_y);
extents->height = roundf (min_y - extents->y_bearing);
if (scaled)
font->scale_glyph_extents (extents);
}
}

8
src/hb-font.hh
View File

@ -179,6 +179,14 @@ struct hb_font_t
*y = parent_scale_y_position (*y);
}
void scale_glyph_extents (hb_glyph_extents_t *extents)
{
extents->x_bearing = em_scale_x (extents->x_bearing);
extents->y_bearing = em_scale_x (extents->y_bearing);
extents->width = em_scale_x (extents->width);
extents->height = em_scale_x (extents->height);
}
/* Public getters */

10
src/hb-ot-cff1-table.cc
View File

@ -422,8 +422,8 @@ bool OT::cff1::accelerator_t::get_extents (hb_font_t *font, hb_codepoint_t glyph
}
else
{
extents->x_bearing = font->em_scalef_x (bounds.min.x.to_real ());
extents->width = font->em_scalef_x (bounds.max.x.to_real ()) - extents->x_bearing;
extents->x_bearing = bounds.min.x.to_int ();
extents->width = bounds.max.x.to_int () - extents->x_bearing;
}
if (bounds.min.y >= bounds.max.y)
{
@ -432,10 +432,12 @@ bool OT::cff1::accelerator_t::get_extents (hb_font_t *font, hb_codepoint_t glyph
}
else
{
extents->y_bearing = font->em_scalef_y (bounds.max.y.to_real ());
extents->height = font->em_scalef_y (bounds.min.y.to_real ()) - extents->y_bearing;
extents->y_bearing = bounds.max.y.to_int ();
extents->height = bounds.min.y.to_int () - extents->y_bearing;
}
font->scale_glyph_extents (extents);
return true;
}

10
src/hb-ot-cff2-table.cc
View File

@ -124,8 +124,8 @@ bool OT::cff2::accelerator_t::get_extents (hb_font_t *font,
}
else
{
extents->x_bearing = font->em_scalef_x (param.min_x.to_real ());
extents->width = font->em_scalef_x (param.max_x.to_real ()) - extents->x_bearing;
extents->x_bearing = param.min_x.to_int ();
extents->width = param.max_x.to_int () - extents->x_bearing;
}
if (param.min_y >= param.max_y)
{
@ -134,10 +134,12 @@ bool OT::cff2::accelerator_t::get_extents (hb_font_t *font,
}
else
{
extents->y_bearing = font->em_scalef_y (param.max_y.to_real ());
extents->height = font->em_scalef_y (param.min_y.to_real ()) - extents->y_bearing;
extents->y_bearing = param.max_y.to_int ();
extents->height = param.min_y.to_int () - extents->y_bearing;
}
font->scale_glyph_extents (extents);
return true;
}

10
src/hb-ot-color-cbdt-table.hh
View File

@ -82,10 +82,12 @@ struct SmallGlyphMetrics
void get_extents (hb_font_t *font, hb_glyph_extents_t *extents) const
{
extents->x_bearing = font->em_scale_x (bearingX);
extents->y_bearing = font->em_scale_y (bearingY);
extents->width = font->em_scale_x (width);
extents->height = font->em_scale_y (-static_cast<int>(height));
extents->x_bearing = bearingX;
extents->y_bearing = bearingY;
extents->width = width;
extents->height = -static_cast<int> (height);
font->scale_glyph_extents (extents);
}
HBUINT8 height;

5
src/hb-ot-color-colr-table.hh
View File

@ -1603,10 +1603,7 @@ struct COLR
extents,
instancer))
{
extents->x_bearing = font->em_scale_x (extents->x_bearing);
extents->y_bearing = font->em_scale_x (extents->y_bearing);
extents->width = font->em_scale_x (extents->width);
extents->height = font->em_scale_x (extents->height);
font->scale_glyph_extents (extents);
return true;
}

18
src/hb-ot-color-sbix-table.hh
View File

@ -313,19 +313,21 @@ struct sbix
if (strike_ppem)
{
float scale = font->face->get_upem () / (float) strike_ppem;
extents->x_bearing = font->em_scalef_x (extents->x_bearing * scale);
extents->y_bearing = font->em_scalef_y (extents->y_bearing * scale);
extents->width = font->em_scalef_x (extents->width * scale);
extents->height = font->em_scalef_y (extents->height * scale);
extents->x_bearing = roundf (extents->x_bearing * scale);
extents->y_bearing = roundf (extents->y_bearing * scale);
extents->width = roundf (extents->width * scale);
extents->height = roundf (extents->height * scale);
}
else
{
extents->x_bearing = font->em_scale_x (extents->x_bearing);
extents->y_bearing = font->em_scale_y (extents->y_bearing);
extents->width = font->em_scale_x (extents->width);
extents->height = font->em_scale_y (extents->height);
extents->x_bearing = extents->x_bearing;
extents->y_bearing = extents->y_bearing;
extents->width = extents->width;
extents->height = extents->height;
}
font->scale_glyph_extents (extents);
hb_blob_destroy (blob);
return strike_ppem;