1 files changed, 123 insertions, 0 deletions
diff --git a/pango2/pangocairo-user-font.c b/pango2/pangocairo-user-font.c
new file mode 100644
index 00000000..edf49457
--- /dev/null
+++ b/pango2/pangocairo-user-font.c
@@ -0,0 +1,123 @@
+/*
+ * pangocairo-user-font.c: User font handling
+ *
+ * Copyright (C) 2022 Red Hat, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#include "config.h"
+
+#include "pango-features.h"
+#include "pangocairo-private.h"
+#include "pango-userfont-private.h"
+#include "pango-userface-private.h"
+
+#include <hb-ot.h>
+
+static cairo_user_data_key_t cairo_user_data;
+
+static cairo_status_t
+render_func (cairo_scaled_font_t  *scaled_font,
+             unsigned long         glyph,
+             cairo_t              *cr,
+             cairo_text_extents_t *extents)
+{
+  cairo_font_face_t *font_face;
+  Pango2Font *font;
+  Pango2UserFace *face;
+  hb_glyph_extents_t glyph_extents;
+  hb_position_t h_advance;
+  hb_position_t v_advance;
+  gboolean is_color;
+
+  font_face = cairo_scaled_font_get_font_face (scaled_font);
+  font = cairo_font_face_get_user_data (font_face, &cairo_user_data);
+  face = PANGO2_USER_FACE (font->face);
+
+  extents->x_bearing = 0;
+  extents->y_bearing = 0;
+  extents->width = 0;
+  extents->height = 0;
+  extents->x_advance = 0;
+  extents->y_advance = 0;
+
+  if (!face->glyph_info_func (face, 1024,
+                              (hb_codepoint_t)glyph,
+                              &glyph_extents,
+                              &h_advance, &v_advance,
+                              &is_color,
+                              face->user_data))
+    {
+      return CAIRO_STATUS_USER_FONT_ERROR;
+    }
+
+  extents->x_bearing = glyph_extents.x_bearing / 1024.;
+  extents->y_bearing = - glyph_extents.y_bearing / 1024.;
+  extents->width = glyph_extents.width / 1024.;
+  extents->height = - glyph_extents.height / 1024.;
+  extents->x_advance = h_advance / 1024.;
+  extents->y_advance = v_advance / 1024.;
+
+  if (!face->render_func (face, font->size,
+                          (hb_codepoint_t)glyph,
+                          face->user_data,
+                          "cairo",
+                          cr))
+    {
+      return CAIRO_STATUS_USER_FONT_ERROR;
+    }
+
+  return CAIRO_STATUS_SUCCESS;
+}
+
+static cairo_status_t
+init_func (cairo_scaled_font_t  *scaled_font,
+           cairo_t              *cr,
+           cairo_font_extents_t *extents)
+{
+  cairo_font_face_t *cairo_face;
+  Pango2Font *font;
+  Pango2UserFace *face;
+  hb_font_extents_t font_extents;
+
+  cairo_face = cairo_scaled_font_get_font_face (scaled_font);
+  font = cairo_font_face_get_user_data (cairo_face, &cairo_user_data);
+  face = (Pango2UserFace *) pango2_font_get_face (font);
+
+  face->font_info_func (face,
+                        pango2_font_get_size (font),
+                        &font_extents,
+                        face->user_data);
+
+  extents->ascent = font_extents.ascender / (font_extents.ascender + font_extents.descender);
+  extents->descent = font_extents.descender / (font_extents.ascender + font_extents.descender);
+
+  return CAIRO_STATUS_SUCCESS;
+}
+
+cairo_font_face_t *
+create_cairo_user_font_face (Pango2Font *font)
+{
+  cairo_font_face_t *cairo_face;
+
+  cairo_face = cairo_user_font_face_create ();
+  cairo_font_face_set_user_data (cairo_face, &cairo_user_data, font, NULL);
+  cairo_user_font_face_set_init_func (cairo_face, init_func);
+  cairo_user_font_face_set_render_color_glyph_func (cairo_face, render_func);
+
+  return cairo_face;
+}