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Apply root transform 

This commit applies scale, slant is still missing.
This commit is contained in:
Matthias Clasen 2022-12-16 12:04:17 -05:00 committed by Behdad Esfahbod
parent 5afca91ff2
commit 5c6329555e
2 changed files with 26 additions and 11 deletions
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15
src/hb-ot-color-colr-table.hh
View File

@ -1954,9 +1954,20 @@ struct COLR
if (paint)
{
// TODO root transform
// TODO apply clipbox clip
int xscale, yscale;
unsigned int upem;
hb_font_get_scale (font, &xscale, &yscale);
upem = hb_face_get_upem (hb_font_get_face (font));
// FIXME handle slant
funcs->push_transform (data, xscale/(float)upem, 0,
0, yscale/(float)upem,
0, 0);
paint_glyph_dispatch (paint, &c);
funcs->pop_transform (data);
}
else
{

22
util/hb-test.c
View File

@ -25,6 +25,7 @@ typedef struct {
int level;
cairo_t *cr;
hb_font_t *font;
hb_font_t *unscaled_font;
hb_color_t *colors;
unsigned int num_colors;
hb_color_t foreground_color;
@ -223,8 +224,10 @@ push_clip_glyph (hb_paint_funcs_t *funcs,
hb_draw_funcs_set_close_path_func (dfuncs, close_path, data, NULL);
cairo_new_path (data->cr);
hb_font_get_glyph_shape (data->font, glyph, dfuncs, data);
/* Note: we need to use a upem-scaled, unslanted copy of the font here,
* since hb has already applied the root transform.
*/
hb_font_get_glyph_shape (data->unscaled_font, glyph, dfuncs, data);
cairo_close_path (data->cr);
cairo_clip (data->cr);
@ -929,6 +932,7 @@ int main (int argc, char *argv[])
hb_blob_t *blob = hb_blob_create_from_file (argv[1]);
hb_face_t *face = hb_face_create (blob, 0);
hb_font_t *font = hb_font_create (face);
hb_font_t *unscaled_font;
hb_font_set_scale (font, 20, 20);
hb_codepoint_t gid = atoi (argv[2]);
hb_glyph_extents_t extents;
@ -936,13 +940,17 @@ int main (int argc, char *argv[])
cairo_pattern_t *pattern;
cairo_matrix_t m;
float xmin, ymin, xmax, ymax;
unsigned int upem;
float size = 120.;
int upem = hb_face_get_upem (hb_font_get_face (font));
hb_font_set_scale (font, size, size);
hb_font_get_glyph_extents (font, gid, &extents);
hb_font_set_scale (font, upem, upem);
unscaled_font = hb_font_create (face);
upem = hb_face_get_upem (face);
hb_font_set_scale (unscaled_font, upem, upem);
hb_font_set_synthetic_slant (unscaled_font, 0.);
xmin = extents.x_bearing;
xmax = xmin + extents.width;
@ -962,6 +970,7 @@ int main (int argc, char *argv[])
cairo_push_group (data.cr);
data.font = font;
data.unscaled_font = unscaled_font;
data.foreground_color = HB_COLOR (0, 0, 0, 255);
data.num_colors = hb_ot_color_palette_get_colors (hb_font_get_face (font),
@ -983,13 +992,8 @@ int main (int argc, char *argv[])
hb_paint_funcs_set_radial_gradient_func (funcs, radial_gradient, &data, NULL);
hb_paint_funcs_set_sweep_gradient_func (funcs, sweep_gradient, &data, NULL);
cairo_save (data.cr);
cairo_scale (data.cr, size/upem, size/upem); // root transform
hb_font_paint_glyph (font, gid, funcs, NULL);
cairo_restore (data.cr);
pattern = cairo_pop_group (data.cr);
cairo_matrix_init_scale (&m, 1, -1);