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[util/draw] Render color glyphs if cairo API available

This commit is contained in:
Behdad Esfahbod 2022-02-05 13:31:05 -06:00
parent 542f8269cb
commit cfc06c24d5
3 changed files with 92 additions and 1 deletions
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4
configure.ac
View File

@ -194,6 +194,10 @@ AC_ARG_WITH(cairo,
have_cairo=false
if test "x$with_cairo" = "xyes" -o "x$with_cairo" = "xauto"; then
PKG_CHECK_MODULES(CAIRO, cairo >= 1.8.0, have_cairo=true, :)
save_libs=$LIBS
LIBS="$LIBS $CAIRO_LIBS"
AC_CHECK_FUNCS(cairo_user_font_face_set_render_color_glyph_func)
LIBS=$save_libs
fi
if test "x$with_cairo" = "xyes" -a "x$have_cairo" != "xtrue"; then
AC_MSG_ERROR([cairo support requested but not found])

1
meson.build
View File

@ -186,6 +186,7 @@ endif
if cairo_dep.found()
conf.set('HAVE_CAIRO', 1)
check_funcs += [['cairo_user_font_face_set_render_color_glyph_func', {'deps': cairo_dep}]]
endif
if cairo_ft_dep.found()

88
util/helper-cairo-user.hh
View File

@ -32,6 +32,8 @@
#include <cairo.h>
#include <hb.h>
#include "hb-blob.hh"
static void
move_to (hb_draw_funcs_t *dfuncs,
cairo_t *cr,
@ -112,15 +114,99 @@ render_glyph (cairo_scaled_font_t *scaled_font,
return CAIRO_STATUS_SUCCESS;
}
#ifdef HAVE_CAIRO_USER_FONT_FACE_SET_RENDER_COLOR_GLYPH_FUNC
static cairo_status_t
_hb_bytes_read_func (hb_bytes_t *src,
char *data,
unsigned length)
{
if (unlikely (src->length < length))
return CAIRO_STATUS_READ_ERROR;
memcpy (data, src->arrayZ, length);
*src += length;
return CAIRO_STATUS_SUCCESS;
}
static cairo_status_t
render_color_glyph (cairo_scaled_font_t *scaled_font,
unsigned long glyph,
cairo_t *cr,
cairo_text_extents_t *extents)
{
hb_font_t *font = (hb_font_t *) (cairo_font_face_get_user_data (cairo_scaled_font_get_font_face (scaled_font),
&_hb_font_cairo_user_data_key));
hb_blob_t *blob = hb_ot_color_glyph_reference_png (font, glyph);
if (blob == hb_blob_get_empty ())
return CAIRO_STATUS_USER_FONT_NOT_IMPLEMENTED;
hb_position_t x_scale, y_scale;
hb_font_get_scale (font, &x_scale, &y_scale);
cairo_scale (cr, +1./x_scale, -1./y_scale);
#ifdef CAIRO_HAS_PNG_FUNCTIONS
/* Draw PNG. */
hb_bytes_t bytes = blob->as_bytes ();
cairo_surface_t *surface = cairo_image_surface_create_from_png_stream ((cairo_read_func_t) _hb_bytes_read_func,
std::addressof (bytes));
hb_blob_destroy (blob);
if (unlikely (cairo_surface_status (surface)) != CAIRO_STATUS_SUCCESS)
{
cairo_surface_destroy (surface);
return CAIRO_STATUS_USER_FONT_NOT_IMPLEMENTED;
}
int width = cairo_image_surface_get_width (surface);
int height = cairo_image_surface_get_width (surface);
hb_glyph_extents_t hb_extents;
if (unlikely (!hb_font_get_glyph_extents (font, glyph, &hb_extents)))
{
cairo_surface_destroy (surface);
return CAIRO_STATUS_USER_FONT_NOT_IMPLEMENTED;
}
cairo_pattern_t *pattern = cairo_pattern_create_for_surface (surface);
cairo_pattern_set_extend (pattern, CAIRO_EXTEND_PAD);
cairo_matrix_t matrix = {(double) width, 0, 0, (double) height, 0, 0};
cairo_pattern_set_matrix (pattern, &matrix);
cairo_translate (cr, hb_extents.x_bearing, hb_extents.y_bearing);
cairo_scale (cr, hb_extents.width, hb_extents.height);
cairo_set_source (cr, pattern);
cairo_rectangle (cr, 0, 0, 1, 1);
cairo_fill (cr);
cairo_pattern_destroy (pattern);
cairo_surface_destroy (surface);
return CAIRO_STATUS_SUCCESS;
#endif
return CAIRO_STATUS_USER_FONT_NOT_IMPLEMENTED;
}
#endif
static inline cairo_font_face_t *
helper_cairo_create_user_font_face (const font_options_t *font_opts)
{
cairo_font_face_t *cairo_face = cairo_user_font_face_create ();
cairo_user_font_face_set_render_glyph_func (cairo_face, render_glyph);
cairo_font_face_set_user_data (cairo_face,
&_hb_font_cairo_user_data_key,
hb_font_reference (font_opts->font),
(cairo_destroy_func_t) hb_font_destroy);
cairo_user_font_face_set_render_glyph_func (cairo_face, render_glyph);
#ifdef HAVE_CAIRO_USER_FONT_FACE_SET_RENDER_COLOR_GLYPH_FUNC
if (hb_ot_color_has_png (hb_font_get_face (font_opts->font)))
cairo_user_font_face_set_render_color_glyph_func (cairo_face, render_color_glyph);
#endif
return cairo_face;
}