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[cairo] Implement (untested) text_to_glyphs callback

This commit is contained in:
Behdad Esfahbod 2022-12-26 16:13:57 -07:00
parent c38abcb3fb
commit 48cb25dd36
1 changed files with 41 additions and 0 deletions
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41
src/hb-cairo.cc
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@ -425,6 +425,46 @@ hb_cairo_init_scaled_font (cairo_scaled_font_t *scaled_font,
return CAIRO_STATUS_SUCCESS;
}
static cairo_status_t
hb_cairo_text_to_glyphs (cairo_scaled_font_t *scaled_font,
const char *utf8,
int utf8_len,
cairo_glyph_t **glyphs,
int *num_glyphs,
cairo_text_cluster_t **clusters,
int *num_clusters,
cairo_text_cluster_flags_t *cluster_flags)
{
hb_font_t *font = (hb_font_t *) cairo_scaled_font_get_user_data (scaled_font,
&hb_cairo_font_user_data_key);
hb_buffer_t *buffer = hb_buffer_create ();
hb_buffer_add_utf8 (buffer, utf8, utf8_len, 0, utf8_len);
hb_buffer_guess_segment_properties (buffer);
hb_shape (font, buffer, nullptr, 0);
double scale_factor = hb_cairo_font_face_get_scale_factor (cairo_scaled_font_get_font_face (scaled_font));
if (!scale_factor)
{
cairo_matrix_t font_matrix;
cairo_scaled_font_get_scale_matrix (scaled_font, &font_matrix);
scale_factor = font->x_scale / font_matrix.xx;
}
hb_cairo_glyphs_from_buffer (buffer,
false,
scale_factor,
0., 0.,
utf8, utf8_len,
glyphs, (unsigned *) num_glyphs,
clusters, (unsigned *) num_clusters,
cluster_flags);
hb_buffer_destroy (buffer);
return CAIRO_STATUS_SUCCESS;
}
static cairo_status_t
hb_cairo_render_glyph (cairo_scaled_font_t *scaled_font,
unsigned long glyph,
@ -491,6 +531,7 @@ user_font_face_create (hb_face_t *face)
cairo_face = cairo_user_font_face_create ();
cairo_user_font_face_set_init_func (cairo_face, hb_cairo_init_scaled_font);
cairo_user_font_face_set_text_to_glyphs_func (cairo_face, hb_cairo_text_to_glyphs);
cairo_user_font_face_set_render_glyph_func (cairo_face, hb_cairo_render_glyph);
#ifdef HAVE_CAIRO_USER_FONT_FACE_SET_RENDER_COLOR_GLYPH_FUNC
if (hb_ot_color_has_png (face) || hb_ot_color_has_layers (face) || hb_ot_color_has_paint (face))