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+/* 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 = 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,
+ NULL, /* 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 = 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;
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-23 19:47:52 +0000