add cairo

1 files changed, 831 insertions, 0 deletions

diff --git a/libs/cairo-1.16.0/src/cairo-user-font.c b/libs/cairo-1.16.0/src/cairo-user-font.c
new file mode 100644
index 0000000..a26fb57
--- /dev/null
+++ b/libs/cairo-1.16.0/src/cairo-user-font.c
@@ -0,0 +1,831 @@
+/* cairo - a vector graphics library with display and print output
+ *
+ * Copyright © 2006, 2008 Red Hat, Inc
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it either under the terms of the GNU Lesser General Public
+ * License version 2.1 as published by the Free Software Foundation
+ * (the "LGPL") or, at your option, under the terms of the Mozilla
+ * Public License Version 1.1 (the "MPL"). If you do not alter this
+ * notice, a recipient may use your version of this file under either
+ * the MPL or the LGPL.
+ *
+ * You should have received a copy of the LGPL along with this library
+ * in the file COPYING-LGPL-2.1; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA
+ * You should have received a copy of the MPL along with this library
+ * in the file COPYING-MPL-1.1
+ *
+ * The contents of this file are subject to the Mozilla Public License
+ * Version 1.1 (the "License"); you may not use this file except in
+ * compliance with the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
+ * OF ANY KIND, either express or implied. See the LGPL or the MPL for
+ * the specific language governing rights and limitations.
+ *
+ * The Original Code is the cairo graphics library.
+ *
+ * The Initial Developer of the Original Code is Red Hat, Inc.
+ *
+ * Contributor(s):
+ *      Kristian Høgsberg <krh@redhat.com>
+ *      Behdad Esfahbod <behdad@behdad.org>
+ */
+
+#include "cairoint.h"
+#include "cairo-user-font-private.h"
+#include "cairo-recording-surface-private.h"
+#include "cairo-analysis-surface-private.h"
+#include "cairo-error-private.h"
+
+/**
+ * SECTION:cairo-user-fonts
+ * @Title:User Fonts
+ * @Short_Description: Font support with font data provided by the user
+ * 
+ * The user-font feature allows the cairo user to provide drawings for glyphs
+ * in a font.  This is most useful in implementing fonts in non-standard
+ * formats, like SVG fonts and Flash fonts, but can also be used by games and
+ * other application to draw "funky" fonts.
+ **/
+
+/**
+ * CAIRO_HAS_USER_FONT:
+ *
+ * Defined if the user font backend is available.
+ * This macro can be used to conditionally compile backend-specific code.
+ * The user font backend is always built in versions of cairo that support
+ * this feature (1.8 and later).
+ *
+ * Since: 1.8
+ **/
+
+typedef struct _cairo_user_scaled_font_methods {
+    cairo_user_scaled_font_init_func_t			init;
+    cairo_user_scaled_font_render_glyph_func_t		render_glyph;
+    cairo_user_scaled_font_unicode_to_glyph_func_t	unicode_to_glyph;
+    cairo_user_scaled_font_text_to_glyphs_func_t	text_to_glyphs;
+} cairo_user_scaled_font_methods_t;
+
+typedef struct _cairo_user_font_face {
+    cairo_font_face_t	             base;
+
+    /* Set to true after first scaled font is created.  At that point,
+     * the scaled_font_methods cannot change anymore. */
+    cairo_bool_t		     immutable;
+
+    cairo_user_scaled_font_methods_t scaled_font_methods;
+} cairo_user_font_face_t;
+
+typedef struct _cairo_user_scaled_font {
+    cairo_scaled_font_t  base;
+
+    cairo_text_extents_t default_glyph_extents;
+
+    /* space to compute extents in, and factors to convert back to user space */
+    cairo_matrix_t extent_scale;
+    double extent_x_scale;
+    double extent_y_scale;
+
+    /* multiplier for metrics hinting */
+    double snap_x_scale;
+    double snap_y_scale;
+
+} cairo_user_scaled_font_t;
+
+/* #cairo_user_scaled_font_t */
+
+static cairo_surface_t *
+_cairo_user_scaled_font_create_recording_surface (const cairo_user_scaled_font_t *scaled_font)
+{
+    cairo_content_t content;
+
+    content = scaled_font->base.options.antialias == CAIRO_ANTIALIAS_SUBPIXEL ?
+						     CAIRO_CONTENT_COLOR_ALPHA :
+						     CAIRO_CONTENT_ALPHA;
+
+    return cairo_recording_surface_create (content, NULL);
+}
+
+
+static cairo_t *
+_cairo_user_scaled_font_create_recording_context (const cairo_user_scaled_font_t *scaled_font,
+						  cairo_surface_t                *recording_surface)
+{
+    cairo_t *cr;
+
+    cr = cairo_create (recording_surface);
+
+    if (!_cairo_matrix_is_scale_0 (&scaled_font->base.scale)) {
+        cairo_matrix_t scale;
+	scale = scaled_font->base.scale;
+	scale.x0 = scale.y0 = 0.;
+	cairo_set_matrix (cr, &scale);
+    }
+
+    cairo_set_font_size (cr, 1.0);
+    cairo_set_font_options (cr, &scaled_font->base.options);
+    cairo_set_source_rgb (cr, 1., 1., 1.);
+
+    return cr;
+}
+
+static cairo_int_status_t
+_cairo_user_scaled_glyph_init (void			 *abstract_font,
+			       cairo_scaled_glyph_t	 *scaled_glyph,
+			       cairo_scaled_glyph_info_t  info)
+{
+    cairo_int_status_t status = CAIRO_STATUS_SUCCESS;
+    cairo_user_scaled_font_t *scaled_font = abstract_font;
+    cairo_surface_t *recording_surface = scaled_glyph->recording_surface;
+
+    if (!scaled_glyph->recording_surface) {
+	cairo_user_font_face_t *face =
+	    (cairo_user_font_face_t *) scaled_font->base.font_face;
+	cairo_text_extents_t extents = scaled_font->default_glyph_extents;
+	cairo_t *cr;
+
+	if (!face->scaled_font_methods.render_glyph)
+	    return CAIRO_STATUS_USER_FONT_NOT_IMPLEMENTED;
+
+	recording_surface = _cairo_user_scaled_font_create_recording_surface (scaled_font);
+
+	/* special case for 0 rank matrix (as in _cairo_scaled_font_init): empty surface */
+        if (!_cairo_matrix_is_scale_0 (&scaled_font->base.scale)) {
+	    cr = _cairo_user_scaled_font_create_recording_context (scaled_font, recording_surface);
+	    status = face->scaled_font_methods.render_glyph ((cairo_scaled_font_t *)scaled_font,
+							     _cairo_scaled_glyph_index(scaled_glyph),
+							     cr, &extents);
+	    if (status == CAIRO_INT_STATUS_SUCCESS)
+	        status = cairo_status (cr);
+
+	    cairo_destroy (cr);
+
+	    if (unlikely (status)) {
+	        cairo_surface_destroy (recording_surface);
+	        return status;
+	    }
+	}
+
+	_cairo_scaled_glyph_set_recording_surface (scaled_glyph,
+						   &scaled_font->base,
+						   recording_surface);
+
+
+	/* set metrics */
+
+	if (extents.width == 0.) {
+	    cairo_box_t bbox;
+	    double x1, y1, x2, y2;
+	    double x_scale, y_scale;
+
+	    /* Compute extents.x/y/width/height from recording_surface,
+	     * in font space.
+	     */
+	    status = _cairo_recording_surface_get_bbox ((cairo_recording_surface_t *) recording_surface,
+							&bbox,
+							&scaled_font->extent_scale);
+	    if (unlikely (status))
+		return status;
+
+	    _cairo_box_to_doubles (&bbox, &x1, &y1, &x2, &y2);
+
+	    x_scale = scaled_font->extent_x_scale;
+	    y_scale = scaled_font->extent_y_scale;
+	    extents.x_bearing = x1 * x_scale;
+	    extents.y_bearing = y1 * y_scale;
+	    extents.width     = (x2 - x1) * x_scale;
+	    extents.height    = (y2 - y1) * y_scale;
+	}
+
+	if (scaled_font->base.options.hint_metrics != CAIRO_HINT_METRICS_OFF) {
+	    extents.x_advance = _cairo_lround (extents.x_advance / scaled_font->snap_x_scale) * scaled_font->snap_x_scale;
+	    extents.y_advance = _cairo_lround (extents.y_advance / scaled_font->snap_y_scale) * scaled_font->snap_y_scale;
+	}
+
+	_cairo_scaled_glyph_set_metrics (scaled_glyph,
+					 &scaled_font->base,
+					 &extents);
+    }
+
+    if (info & CAIRO_SCALED_GLYPH_INFO_SURFACE) {
+	cairo_surface_t	*surface;
+	cairo_format_t format;
+	int width, height;
+
+	/* TODO
+	 * extend the glyph cache to support argb glyphs.
+	 * need to figure out the semantics and interaction with subpixel
+	 * rendering first.
+	 */
+
+	width = _cairo_fixed_integer_ceil (scaled_glyph->bbox.p2.x) -
+	  _cairo_fixed_integer_floor (scaled_glyph->bbox.p1.x);
+	height = _cairo_fixed_integer_ceil (scaled_glyph->bbox.p2.y) -
+	  _cairo_fixed_integer_floor (scaled_glyph->bbox.p1.y);
+
+	switch (scaled_font->base.options.antialias) {
+	default:
+	case CAIRO_ANTIALIAS_DEFAULT:
+	case CAIRO_ANTIALIAS_FAST:
+	case CAIRO_ANTIALIAS_GOOD:
+	case CAIRO_ANTIALIAS_GRAY:	format = CAIRO_FORMAT_A8;	break;
+	case CAIRO_ANTIALIAS_NONE:	format = CAIRO_FORMAT_A1;	break;
+	case CAIRO_ANTIALIAS_BEST:
+	case CAIRO_ANTIALIAS_SUBPIXEL:	format = CAIRO_FORMAT_ARGB32;	break;
+	}
+	surface = cairo_image_surface_create (format, width, height);
+
+	cairo_surface_set_device_offset (surface,
+	                                 - _cairo_fixed_integer_floor (scaled_glyph->bbox.p1.x),
+	                                 - _cairo_fixed_integer_floor (scaled_glyph->bbox.p1.y));
+	status = _cairo_recording_surface_replay (recording_surface, surface);
+
+	if (unlikely (status)) {
+	    cairo_surface_destroy(surface);
+	    return status;
+	}
+
+	_cairo_scaled_glyph_set_surface (scaled_glyph,
+					 &scaled_font->base,
+					 (cairo_image_surface_t *) surface);
+    }
+
+    if (info & CAIRO_SCALED_GLYPH_INFO_PATH) {
+	cairo_path_fixed_t *path = _cairo_path_fixed_create ();
+	if (!path)
+	    return _cairo_error (CAIRO_STATUS_NO_MEMORY);
+
+	status = _cairo_recording_surface_get_path (recording_surface, path);
+	if (unlikely (status)) {
+	    _cairo_path_fixed_destroy (path);
+	    return status;
+	}
+
+	_cairo_scaled_glyph_set_path (scaled_glyph,
+				      &scaled_font->base,
+				      path);
+    }
+
+    return status;
+}
+
+static unsigned long
+_cairo_user_ucs4_to_index (void	    *abstract_font,
+			   uint32_t  ucs4)
+{
+    cairo_user_scaled_font_t *scaled_font = abstract_font;
+    cairo_user_font_face_t *face =
+	(cairo_user_font_face_t *) scaled_font->base.font_face;
+    unsigned long glyph = 0;
+
+    if (face->scaled_font_methods.unicode_to_glyph) {
+	cairo_status_t status;
+
+	status = face->scaled_font_methods.unicode_to_glyph (&scaled_font->base,
+							     ucs4, &glyph);
+
+	if (status == CAIRO_STATUS_USER_FONT_NOT_IMPLEMENTED)
+	    goto not_implemented;
+
+	if (status != CAIRO_STATUS_SUCCESS) {
+	    status = _cairo_scaled_font_set_error (&scaled_font->base, status);
+	    glyph = 0;
+	}
+
+    } else {
+not_implemented:
+	glyph = ucs4;
+    }
+
+    return glyph;
+}
+
+static cairo_int_status_t
+_cairo_user_text_to_glyphs (void		      *abstract_font,
+			    double		       x,
+			    double		       y,
+			    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)
+{
+    cairo_int_status_t status = CAIRO_INT_STATUS_UNSUPPORTED;
+
+    cairo_user_scaled_font_t *scaled_font = abstract_font;
+    cairo_user_font_face_t *face =
+	(cairo_user_font_face_t *) scaled_font->base.font_face;
+
+    if (face->scaled_font_methods.text_to_glyphs) {
+	int i;
+	cairo_glyph_t *orig_glyphs = *glyphs;
+	int orig_num_glyphs = *num_glyphs;
+
+	status = face->scaled_font_methods.text_to_glyphs (&scaled_font->base,
+							   utf8, utf8_len,
+							   glyphs, num_glyphs,
+							   clusters, num_clusters, cluster_flags);
+
+	if (status != CAIRO_INT_STATUS_SUCCESS &&
+	    status != CAIRO_INT_STATUS_USER_FONT_NOT_IMPLEMENTED)
+	    return status;
+
+	if (status == CAIRO_INT_STATUS_USER_FONT_NOT_IMPLEMENTED ||
+	    *num_glyphs < 0) {
+	    if (orig_glyphs != *glyphs) {
+		cairo_glyph_free (*glyphs);
+		*glyphs = orig_glyphs;
+	    }
+	    *num_glyphs = orig_num_glyphs;
+	    return CAIRO_INT_STATUS_UNSUPPORTED;
+	}
+
+	/* Convert from font space to user space and add x,y */
+	for (i = 0; i < *num_glyphs; i++) {
+	    double gx = (*glyphs)[i].x;
+	    double gy = (*glyphs)[i].y;
+
+	    cairo_matrix_transform_point (&scaled_font->base.font_matrix,
+					  &gx, &gy);
+
+	    (*glyphs)[i].x = gx + x;
+	    (*glyphs)[i].y = gy + y;
+	}
+    }
+
+    return status;
+}
+
+static cairo_status_t
+_cairo_user_font_face_scaled_font_create (void                        *abstract_face,
+					  const cairo_matrix_t        *font_matrix,
+					  const cairo_matrix_t        *ctm,
+					  const cairo_font_options_t  *options,
+					  cairo_scaled_font_t        **scaled_font);
+
+static cairo_status_t
+_cairo_user_font_face_create_for_toy (cairo_toy_font_face_t   *toy_face,
+				      cairo_font_face_t      **font_face)
+{
+    return _cairo_font_face_twin_create_for_toy (toy_face, font_face);
+}
+
+static const cairo_scaled_font_backend_t _cairo_user_scaled_font_backend = {
+    CAIRO_FONT_TYPE_USER,
+    NULL,	/* scaled_font_fini */
+    _cairo_user_scaled_glyph_init,
+    _cairo_user_text_to_glyphs,
+    _cairo_user_ucs4_to_index,
+    NULL,	/* show_glyphs */
+    NULL,	/* load_truetype_table */
+    NULL	/* index_to_ucs4 */
+};
+
+/* #cairo_user_font_face_t */
+
+static cairo_status_t
+_cairo_user_font_face_scaled_font_create (void                        *abstract_face,
+					  const cairo_matrix_t        *font_matrix,
+					  const cairo_matrix_t        *ctm,
+					  const cairo_font_options_t  *options,
+					  cairo_scaled_font_t        **scaled_font)
+{
+    cairo_status_t status = CAIRO_STATUS_SUCCESS;
+    cairo_user_font_face_t *font_face = abstract_face;
+    cairo_user_scaled_font_t *user_scaled_font = NULL;
+    cairo_font_extents_t font_extents = {1., 0., 1., 1., 0.};
+
+    font_face->immutable = TRUE;
+
+    user_scaled_font = _cairo_malloc (sizeof (cairo_user_scaled_font_t));
+    if (unlikely (user_scaled_font == NULL))
+	return _cairo_error (CAIRO_STATUS_NO_MEMORY);
+
+    status = _cairo_scaled_font_init (&user_scaled_font->base,
+				      &font_face->base,
+				      font_matrix, ctm, options,
+				      &_cairo_user_scaled_font_backend);
+
+    if (unlikely (status)) {
+	free (user_scaled_font);
+	return status;
+    }
+
+    /* XXX metrics hinting? */
+
+    /* compute a normalized version of font scale matrix to compute
+     * extents in.  This is to minimize error caused by the cairo_fixed_t
+     * representation. */
+    {
+	double fixed_scale, x_scale, y_scale;
+
+	user_scaled_font->extent_scale = user_scaled_font->base.scale_inverse;
+	status = _cairo_matrix_compute_basis_scale_factors (&user_scaled_font->extent_scale,
+						      &x_scale, &y_scale,
+						      1);
+	if (status == CAIRO_STATUS_SUCCESS) {
+
+	    if (x_scale == 0) x_scale = 1.;
+	    if (y_scale == 0) y_scale = 1.;
+
+	    user_scaled_font->snap_x_scale = x_scale;
+	    user_scaled_font->snap_y_scale = y_scale;
+
+	    /* since glyphs are pretty much 1.0x1.0, we can reduce error by
+	     * scaling to a larger square.  say, 1024.x1024. */
+	    fixed_scale = 1024.;
+	    x_scale /= fixed_scale;
+	    y_scale /= fixed_scale;
+
+	    cairo_matrix_scale (&user_scaled_font->extent_scale, 1. / x_scale, 1. / y_scale);
+
+	    user_scaled_font->extent_x_scale = x_scale;
+	    user_scaled_font->extent_y_scale = y_scale;
+	}
+    }
+
+    if (status == CAIRO_STATUS_SUCCESS &&
+	font_face->scaled_font_methods.init != NULL)
+    {
+	/* Lock the scaled_font mutex such that user doesn't accidentally try
+         * to use it just yet. */
+	CAIRO_MUTEX_LOCK (user_scaled_font->base.mutex);
+
+	/* Give away fontmap lock such that user-font can use other fonts */
+	status = _cairo_scaled_font_register_placeholder_and_unlock_font_map (&user_scaled_font->base);
+	if (status == CAIRO_STATUS_SUCCESS) {
+	    cairo_surface_t *recording_surface;
+	    cairo_t *cr;
+
+	    recording_surface = _cairo_user_scaled_font_create_recording_surface (user_scaled_font);
+	    cr = _cairo_user_scaled_font_create_recording_context (user_scaled_font, recording_surface);
+	    cairo_surface_destroy (recording_surface);
+
+	    status = font_face->scaled_font_methods.init (&user_scaled_font->base,
+							  cr,
+							  &font_extents);
+
+	    if (status == CAIRO_STATUS_USER_FONT_NOT_IMPLEMENTED)
+		status = CAIRO_STATUS_SUCCESS;
+
+	    if (status == CAIRO_STATUS_SUCCESS)
+		status = cairo_status (cr);
+
+	    cairo_destroy (cr);
+
+	    _cairo_scaled_font_unregister_placeholder_and_lock_font_map (&user_scaled_font->base);
+	}
+
+	CAIRO_MUTEX_UNLOCK (user_scaled_font->base.mutex);
+    }
+
+    if (status == CAIRO_STATUS_SUCCESS)
+	status = _cairo_scaled_font_set_metrics (&user_scaled_font->base, &font_extents);
+
+    if (status != CAIRO_STATUS_SUCCESS) {
+        _cairo_scaled_font_fini (&user_scaled_font->base);
+	free (user_scaled_font);
+    } else {
+        user_scaled_font->default_glyph_extents.x_bearing = 0.;
+        user_scaled_font->default_glyph_extents.y_bearing = -font_extents.ascent;
+        user_scaled_font->default_glyph_extents.width = 0.;
+        user_scaled_font->default_glyph_extents.height = font_extents.ascent + font_extents.descent;
+        user_scaled_font->default_glyph_extents.x_advance = font_extents.max_x_advance;
+        user_scaled_font->default_glyph_extents.y_advance = 0.;
+
+	*scaled_font = &user_scaled_font->base;
+    }
+
+    return status;
+}
+
+const cairo_font_face_backend_t _cairo_user_font_face_backend = {
+    CAIRO_FONT_TYPE_USER,
+    _cairo_user_font_face_create_for_toy,
+    _cairo_font_face_destroy,
+    _cairo_user_font_face_scaled_font_create
+};
+
+
+cairo_bool_t
+_cairo_font_face_is_user (cairo_font_face_t *font_face)
+{
+    return font_face->backend == &_cairo_user_font_face_backend;
+}
+
+/* Implement the public interface */
+
+/**
+ * cairo_user_font_face_create:
+ *
+ * Creates a new user font-face.
+ *
+ * Use the setter functions to associate callbacks with the returned
+ * user font.  The only mandatory callback is render_glyph.
+ *
+ * After the font-face is created, the user can attach arbitrary data
+ * (the actual font data) to it using cairo_font_face_set_user_data()
+ * and access it from the user-font callbacks by using
+ * cairo_scaled_font_get_font_face() followed by
+ * cairo_font_face_get_user_data().
+ *
+ * Return value: a newly created #cairo_font_face_t. Free with
+ *  cairo_font_face_destroy() when you are done using it.
+ *
+ * Since: 1.8
+ **/
+cairo_font_face_t *
+cairo_user_font_face_create (void)
+{
+    cairo_user_font_face_t *font_face;
+
+    font_face = _cairo_malloc (sizeof (cairo_user_font_face_t));
+    if (!font_face) {
+	_cairo_error_throw (CAIRO_STATUS_NO_MEMORY);
+	return (cairo_font_face_t *)&_cairo_font_face_nil;
+    }
+
+    _cairo_font_face_init (&font_face->base, &_cairo_user_font_face_backend);
+
+    font_face->immutable = FALSE;
+    memset (&font_face->scaled_font_methods, 0, sizeof (font_face->scaled_font_methods));
+
+    return &font_face->base;
+}
+slim_hidden_def(cairo_user_font_face_create);
+
+/* User-font method setters */
+
+
+/**
+ * cairo_user_font_face_set_init_func:
+ * @font_face: A user font face
+ * @init_func: The init callback, or %NULL
+ *
+ * Sets the scaled-font initialization function of a user-font.
+ * See #cairo_user_scaled_font_init_func_t for details of how the callback
+ * works.
+ *
+ * The font-face should not be immutable or a %CAIRO_STATUS_USER_FONT_IMMUTABLE
+ * error will occur.  A user font-face is immutable as soon as a scaled-font
+ * is created from it.
+ *
+ * Since: 1.8
+ **/
+void
+cairo_user_font_face_set_init_func (cairo_font_face_t                  *font_face,
+				    cairo_user_scaled_font_init_func_t  init_func)
+{
+    cairo_user_font_face_t *user_font_face;
+
+    if (font_face->status)
+	return;
+
+    if (! _cairo_font_face_is_user (font_face)) {
+	if (_cairo_font_face_set_error (font_face, CAIRO_STATUS_FONT_TYPE_MISMATCH))
+	    return;
+    }
+
+    user_font_face = (cairo_user_font_face_t *) font_face;
+    if (user_font_face->immutable) {
+	if (_cairo_font_face_set_error (font_face, CAIRO_STATUS_USER_FONT_IMMUTABLE))
+	    return;
+    }
+    user_font_face->scaled_font_methods.init = init_func;
+}
+slim_hidden_def(cairo_user_font_face_set_init_func);
+
+/**
+ * cairo_user_font_face_set_render_glyph_func:
+ * @font_face: A user font face
+ * @render_glyph_func: The render_glyph callback, or %NULL
+ *
+ * Sets the glyph rendering function of a user-font.
+ * See #cairo_user_scaled_font_render_glyph_func_t for details of how the callback
+ * works.
+ *
+ * The font-face should not be immutable or a %CAIRO_STATUS_USER_FONT_IMMUTABLE
+ * error will occur.  A user font-face is immutable as soon as a scaled-font
+ * is created from it.
+ *
+ * The render_glyph callback is the only mandatory callback of a user-font.
+ * If the callback is %NULL and a glyph is tried to be rendered using
+ * @font_face, a %CAIRO_STATUS_USER_FONT_ERROR will occur.
+ *
+ * Since: 1.8
+ **/
+void
+cairo_user_font_face_set_render_glyph_func (cairo_font_face_t                          *font_face,
+					    cairo_user_scaled_font_render_glyph_func_t  render_glyph_func)
+{
+    cairo_user_font_face_t *user_font_face;
+
+    if (font_face->status)
+	return;
+
+    if (! _cairo_font_face_is_user (font_face)) {
+	if (_cairo_font_face_set_error (font_face, CAIRO_STATUS_FONT_TYPE_MISMATCH))
+	    return;
+    }
+
+    user_font_face = (cairo_user_font_face_t *) font_face;
+    if (user_font_face->immutable) {
+	if (_cairo_font_face_set_error (font_face, CAIRO_STATUS_USER_FONT_IMMUTABLE))
+	    return;
+    }
+    user_font_face->scaled_font_methods.render_glyph = render_glyph_func;
+}
+slim_hidden_def(cairo_user_font_face_set_render_glyph_func);
+
+/**
+ * cairo_user_font_face_set_text_to_glyphs_func:
+ * @font_face: A user font face
+ * @text_to_glyphs_func: The text_to_glyphs callback, or %NULL
+ *
+ * Sets th text-to-glyphs conversion function of a user-font.
+ * See #cairo_user_scaled_font_text_to_glyphs_func_t for details of how the callback
+ * works.
+ *
+ * The font-face should not be immutable or a %CAIRO_STATUS_USER_FONT_IMMUTABLE
+ * error will occur.  A user font-face is immutable as soon as a scaled-font
+ * is created from it.
+ *
+ * Since: 1.8
+ **/
+void
+cairo_user_font_face_set_text_to_glyphs_func (cairo_font_face_t                            *font_face,
+					      cairo_user_scaled_font_text_to_glyphs_func_t  text_to_glyphs_func)
+{
+    cairo_user_font_face_t *user_font_face;
+
+    if (font_face->status)
+	return;
+
+    if (! _cairo_font_face_is_user (font_face)) {
+	if (_cairo_font_face_set_error (font_face, CAIRO_STATUS_FONT_TYPE_MISMATCH))
+	    return;
+    }
+
+    user_font_face = (cairo_user_font_face_t *) font_face;
+    if (user_font_face->immutable) {
+	if (_cairo_font_face_set_error (font_face, CAIRO_STATUS_USER_FONT_IMMUTABLE))
+	    return;
+    }
+    user_font_face->scaled_font_methods.text_to_glyphs = text_to_glyphs_func;
+}
+
+/**
+ * cairo_user_font_face_set_unicode_to_glyph_func:
+ * @font_face: A user font face
+ * @unicode_to_glyph_func: The unicode_to_glyph callback, or %NULL
+ *
+ * Sets the unicode-to-glyph conversion function of a user-font.
+ * See #cairo_user_scaled_font_unicode_to_glyph_func_t for details of how the callback
+ * works.
+ *
+ * The font-face should not be immutable or a %CAIRO_STATUS_USER_FONT_IMMUTABLE
+ * error will occur.  A user font-face is immutable as soon as a scaled-font
+ * is created from it.
+ *
+ * Since: 1.8
+ **/
+void
+cairo_user_font_face_set_unicode_to_glyph_func (cairo_font_face_t                              *font_face,
+						cairo_user_scaled_font_unicode_to_glyph_func_t  unicode_to_glyph_func)
+{
+    cairo_user_font_face_t *user_font_face;
+    if (font_face->status)
+	return;
+
+    if (! _cairo_font_face_is_user (font_face)) {
+	if (_cairo_font_face_set_error (font_face, CAIRO_STATUS_FONT_TYPE_MISMATCH))
+	    return;
+    }
+
+    user_font_face = (cairo_user_font_face_t *) font_face;
+    if (user_font_face->immutable) {
+	if (_cairo_font_face_set_error (font_face, CAIRO_STATUS_USER_FONT_IMMUTABLE))
+	    return;
+    }
+    user_font_face->scaled_font_methods.unicode_to_glyph = unicode_to_glyph_func;
+}
+slim_hidden_def(cairo_user_font_face_set_unicode_to_glyph_func);
+
+/* User-font method getters */
+
+/**
+ * cairo_user_font_face_get_init_func:
+ * @font_face: A user font face
+ *
+ * Gets the scaled-font initialization function of a user-font.
+ *
+ * Return value: The init callback of @font_face
+ * or %NULL if none set or an error has occurred.
+ *
+ * Since: 1.8
+ **/
+cairo_user_scaled_font_init_func_t
+cairo_user_font_face_get_init_func (cairo_font_face_t *font_face)
+{
+    cairo_user_font_face_t *user_font_face;
+
+    if (font_face->status)
+	return NULL;
+
+    if (! _cairo_font_face_is_user (font_face)) {
+	if (_cairo_font_face_set_error (font_face, CAIRO_STATUS_FONT_TYPE_MISMATCH))
+	    return NULL;
+    }
+
+    user_font_face = (cairo_user_font_face_t *) font_face;
+    return user_font_face->scaled_font_methods.init;
+}
+
+/**
+ * cairo_user_font_face_get_render_glyph_func:
+ * @font_face: A user font face
+ *
+ * Gets the glyph rendering function of a user-font.
+ *
+ * Return value: The render_glyph callback of @font_face
+ * or %NULL if none set or an error has occurred.
+ *
+ * Since: 1.8
+ **/
+cairo_user_scaled_font_render_glyph_func_t
+cairo_user_font_face_get_render_glyph_func (cairo_font_face_t *font_face)
+{
+    cairo_user_font_face_t *user_font_face;
+
+    if (font_face->status)
+	return NULL;
+
+    if (! _cairo_font_face_is_user (font_face)) {
+	if (_cairo_font_face_set_error (font_face, CAIRO_STATUS_FONT_TYPE_MISMATCH))
+	    return NULL;
+    }
+
+    user_font_face = (cairo_user_font_face_t *) font_face;
+    return user_font_face->scaled_font_methods.render_glyph;
+}
+
+/**
+ * cairo_user_font_face_get_text_to_glyphs_func:
+ * @font_face: A user font face
+ *
+ * Gets the text-to-glyphs conversion function of a user-font.
+ *
+ * Return value: The text_to_glyphs callback of @font_face
+ * or %NULL if none set or an error occurred.
+ *
+ * Since: 1.8
+ **/
+cairo_user_scaled_font_text_to_glyphs_func_t
+cairo_user_font_face_get_text_to_glyphs_func (cairo_font_face_t *font_face)
+{
+    cairo_user_font_face_t *user_font_face;
+
+    if (font_face->status)
+	return NULL;
+
+    if (! _cairo_font_face_is_user (font_face)) {
+	if (_cairo_font_face_set_error (font_face, CAIRO_STATUS_FONT_TYPE_MISMATCH))
+	    return NULL;
+    }
+
+    user_font_face = (cairo_user_font_face_t *) font_face;
+    return user_font_face->scaled_font_methods.text_to_glyphs;
+}
+
+/**
+ * cairo_user_font_face_get_unicode_to_glyph_func:
+ * @font_face: A user font face
+ *
+ * Gets the unicode-to-glyph conversion function of a user-font.
+ *
+ * Return value: The unicode_to_glyph callback of @font_face
+ * or %NULL if none set or an error occurred.
+ *
+ * Since: 1.8
+ **/
+cairo_user_scaled_font_unicode_to_glyph_func_t
+cairo_user_font_face_get_unicode_to_glyph_func (cairo_font_face_t *font_face)
+{
+    cairo_user_font_face_t *user_font_face;
+
+    if (font_face->status)
+	return NULL;
+
+    if (! _cairo_font_face_is_user (font_face)) {
+	if (_cairo_font_face_set_error (font_face, CAIRO_STATUS_FONT_TYPE_MISMATCH))
+	    return NULL;
+    }
+
+    user_font_face = (cairo_user_font_face_t *) font_face;
+    return user_font_face->scaled_font_methods.unicode_to_glyph;
+}