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[var] Hook up variations to FreeType face 

hb-view correctly renders variations with ft font-funcs now.
hb-ot-font needs HVAR implementation.
This commit is contained in:
Behdad Esfahbod 2017-01-21 18:10:08 -08:00
parent 111f3e5517
commit 47ee34e847
2 changed files with 25 additions and 1 deletions
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10
src/hb-ft.cc
View File

@ -736,6 +736,16 @@ hb_ft_font_set_funcs (hb_font_t *font)
FT_Set_Transform (ft_face, &matrix, NULL);
}
unsigned int num_coords;
int *coords = hb_font_get_var_coords_normalized (font, &num_coords);
if (num_coords)
{
FT_Fixed ft_coords[num_coords];
for (unsigned int i = 0; i < num_coords; i++)
ft_coords[i] = coords[i] << 2;
FT_Set_Var_Blend_Coordinates (ft_face, num_coords, ft_coords);
}
ft_face->generic.data = blob;
ft_face->generic.finalizer = (FT_Generic_Finalizer) _release_blob;

16
util/helper-cairo.cc
View File

@ -28,6 +28,7 @@
#include <cairo-ft.h>
#include <hb-ft.h>
#include FT_MULTIPLE_MASTERS_H
#include "helper-cairo-ansi.hh"
#ifdef CAIRO_HAS_SVG_SURFACE
@ -76,7 +77,8 @@ helper_cairo_create_scaled_font (const font_options_t *font_opts)
cairo_font_face_t *cairo_face;
/* We cannot use the FT_Face from hb_font_t, as doing so will confuse hb_font_t because
* cairo will reset the face size. As such, create new face... */
* cairo will reset the face size. As such, create new face...
* TODO Perhaps add API to hb-ft to encapsulate this code. */
FT_Face ft_face = NULL;//hb_ft_font_get_face (font);
if (!ft_face)
{
@ -100,7 +102,19 @@ helper_cairo_create_scaled_font (const font_options_t *font_opts)
CAIRO_FONT_WEIGHT_NORMAL);
}
else
{
unsigned int num_coords;
int *coords = hb_font_get_var_coords_normalized (font, &num_coords);
if (num_coords)
{
FT_Fixed ft_coords[num_coords];
for (unsigned int i = 0; i < num_coords; i++)
ft_coords[i] = coords[i] << 2;
FT_Set_Var_Blend_Coordinates (ft_face, num_coords, ft_coords);
}
cairo_face = cairo_ft_font_face_create_for_ft_face (ft_face, 0);
}
cairo_matrix_t ctm, font_matrix;
cairo_font_options_t *font_options;