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-rw-r--r--gfx/cairo/cairo/src/cairo-user-font.c583
1 files changed, 479 insertions, 104 deletions
diff --git a/gfx/cairo/cairo/src/cairo-user-font.c b/gfx/cairo/cairo/src/cairo-user-font.c
index a26fb57ee1..37642cd1c1 100644
--- a/gfx/cairo/cairo/src/cairo-user-font.c
+++ b/gfx/cairo/cairo/src/cairo-user-font.c
@@ -1,3 +1,4 @@
+/* -*- Mode: c; tab-width: 8; c-basic-offset: 4; indent-tabs-mode: t; -*- */
/* cairo - a vector graphics library with display and print output
*
* Copyright © 2006, 2008 Red Hat, Inc
@@ -44,7 +45,7 @@
* 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
@@ -64,6 +65,7 @@
typedef struct _cairo_user_scaled_font_methods {
cairo_user_scaled_font_init_func_t init;
+ cairo_user_scaled_font_render_glyph_func_t render_color_glyph;
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;
@@ -75,7 +77,7 @@ typedef struct _cairo_user_font_face {
/* Set to true after first scaled font is created. At that point,
* the scaled_font_methods cannot change anymore. */
cairo_bool_t immutable;
-
+ cairo_bool_t has_color;
cairo_user_scaled_font_methods_t scaled_font_methods;
} cairo_user_font_face_t;
@@ -93,26 +95,48 @@ typedef struct _cairo_user_scaled_font {
double snap_x_scale;
double snap_y_scale;
+ cairo_pattern_t *foreground_marker;
+ cairo_pattern_t *foreground_pattern;
+ cairo_bool_t foreground_marker_used;
+ cairo_bool_t foreground_colors_used;
+
} 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_user_scaled_font_create_recording_surface (cairo_user_scaled_font_t *scaled_font,
+ cairo_bool_t color,
+ const cairo_color_t *foreground_color)
{
cairo_content_t content;
- content = scaled_font->base.options.antialias == CAIRO_ANTIALIAS_SUBPIXEL ?
- CAIRO_CONTENT_COLOR_ALPHA :
- CAIRO_CONTENT_ALPHA;
+ if (color) {
+ content = CAIRO_CONTENT_COLOR_ALPHA;
+ } else {
+ content = scaled_font->base.options.antialias == CAIRO_ANTIALIAS_SUBPIXEL ?
+ CAIRO_CONTENT_COLOR_ALPHA :
+ CAIRO_CONTENT_ALPHA;
+ }
+
+ if (scaled_font->foreground_pattern)
+ cairo_pattern_destroy (scaled_font->foreground_pattern);
+
+ scaled_font->foreground_marker_used = FALSE;
+ scaled_font->foreground_colors_used = FALSE;
+ if (foreground_color) {
+ scaled_font->foreground_pattern = _cairo_pattern_create_solid (foreground_color);
+ } else {
+ scaled_font->foreground_pattern = cairo_pattern_create_rgb (0, 0, 0);
+ }
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_surface_t *recording_surface,
+ cairo_bool_t color)
{
cairo_t *cr;
@@ -127,130 +151,264 @@ _cairo_user_scaled_font_create_recording_context (const cairo_user_scaled_font_t
cairo_set_font_size (cr, 1.0);
cairo_set_font_options (cr, &scaled_font->base.options);
- cairo_set_source_rgb (cr, 1., 1., 1.);
+ if (!color)
+ 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_user_scaled_glyph_init_record_glyph (cairo_user_scaled_font_t *scaled_font,
+ cairo_scaled_glyph_t *scaled_glyph,
+ const cairo_color_t *foreground_color)
{
+ 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_surface_t *recording_surface = NULL;
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;
+ cairo_t *cr;
+ cairo_bool_t foreground_used = FALSE;
+
+ if (!face->scaled_font_methods.render_color_glyph && !face->scaled_font_methods.render_glyph)
+ return CAIRO_STATUS_USER_FONT_NOT_IMPLEMENTED;
+
+ /* special case for 0 rank matrix (as in _cairo_scaled_font_init): empty surface */
+ if (_cairo_matrix_is_scale_0 (&scaled_font->base.scale)) {
+ recording_surface = _cairo_user_scaled_font_create_recording_surface (scaled_font, FALSE, foreground_color);
+ _cairo_scaled_glyph_set_recording_surface (scaled_glyph,
+ &scaled_font->base,
+ recording_surface,
+ NULL);
+ } else {
+ status = CAIRO_STATUS_USER_FONT_NOT_IMPLEMENTED;
+
+ if (face->scaled_font_methods.render_color_glyph &&
+ scaled_font->base.options.color_mode != CAIRO_COLOR_MODE_NO_COLOR)
+ {
+ recording_surface = _cairo_user_scaled_font_create_recording_surface (scaled_font, TRUE, foreground_color);
+
+ cr = _cairo_user_scaled_font_create_recording_context (scaled_font, recording_surface, TRUE);
+ status = face->scaled_font_methods.render_color_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);
+ scaled_glyph->color_glyph = TRUE;
+ scaled_glyph->color_glyph_set = TRUE;
+ }
- 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;
+ cairo_destroy (cr);
+ foreground_used = scaled_font->foreground_marker_used || scaled_font->foreground_colors_used;
+ }
- if (!face->scaled_font_methods.render_glyph)
- return CAIRO_STATUS_USER_FONT_NOT_IMPLEMENTED;
+ if (status == (cairo_int_status_t)CAIRO_STATUS_USER_FONT_NOT_IMPLEMENTED &&
+ face->scaled_font_methods.render_glyph) {
+ if (recording_surface)
+ cairo_surface_destroy (recording_surface);
+ recording_surface = _cairo_user_scaled_font_create_recording_surface (scaled_font, FALSE, foreground_color);
+ recording_surface->device_transform.x0 = .25 * _cairo_scaled_glyph_xphase (scaled_glyph);
+ recording_surface->device_transform.y0 = .25 * _cairo_scaled_glyph_yphase (scaled_glyph);
- recording_surface = _cairo_user_scaled_font_create_recording_surface (scaled_font);
+ cr = _cairo_user_scaled_font_create_recording_context (scaled_font, recording_surface, FALSE);
- /* 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);
+ if (status == CAIRO_INT_STATUS_SUCCESS) {
+ status = cairo_status (cr);
+ scaled_glyph->color_glyph = FALSE;
+ scaled_glyph->color_glyph_set = TRUE;
+ }
cairo_destroy (cr);
+ foreground_used = FALSE;
+ }
- if (unlikely (status)) {
- cairo_surface_destroy (recording_surface);
- return status;
- }
+ if (status != CAIRO_INT_STATUS_SUCCESS) {
+ if (recording_surface)
+ cairo_surface_destroy (recording_surface);
+ return status;
}
_cairo_scaled_glyph_set_recording_surface (scaled_glyph,
&scaled_font->base,
- recording_surface);
+ recording_surface,
+ foreground_used ? foreground_color : NULL);
+ }
+ /* set metrics */
- /* set metrics */
+ if (extents.width == 0.) {
+ cairo_box_t bbox;
+ double x1, y1, x2, y2;
+ double x_scale, y_scale;
- 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;
- /* 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);
- _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;
+ }
- 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;
+ }
- 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);
- _cairo_scaled_glyph_set_metrics (scaled_glyph,
- &scaled_font->base,
- &extents);
- }
+ return status;
+}
- 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.
- */
+static cairo_int_status_t
+_cairo_user_scaled_glyph_init_surface (cairo_user_scaled_font_t *scaled_font,
+ cairo_scaled_glyph_t *scaled_glyph,
+ cairo_scaled_glyph_info_t info,
+ const cairo_color_t *foreground_color)
+{
+ cairo_surface_t *surface;
+ cairo_format_t format;
+ int width, height;
+ cairo_int_status_t status = CAIRO_STATUS_SUCCESS;
+ cairo_bool_t foreground_used;
- 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);
+ /* TODO
+ * extend the glyph cache to support argb glyphs.
+ * need to figure out the semantics and interaction with subpixel
+ * rendering first.
+ */
- 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);
+ /* Only one info type at a time handled in this function */
+ assert (info == CAIRO_SCALED_GLYPH_INFO_COLOR_SURFACE || info == CAIRO_SCALED_GLYPH_INFO_SURFACE);
- 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);
+ 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);
- if (unlikely (status)) {
- cairo_surface_destroy(surface);
- return status;
+ if (info == CAIRO_SCALED_GLYPH_INFO_COLOR_SURFACE) {
+ format = CAIRO_FORMAT_ARGB32;
+ } else {
+ 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));
+
+ if (info == CAIRO_SCALED_GLYPH_INFO_COLOR_SURFACE) {
+ status = _cairo_recording_surface_replay_with_foreground_color (scaled_glyph->recording_surface,
+ surface,
+ foreground_color,
+ &foreground_used);
+
+ } else {
+ status = _cairo_recording_surface_replay (scaled_glyph->recording_surface, surface);
+ foreground_used = FALSE;
+ }
+ if (unlikely (status)) {
+ cairo_surface_destroy(surface);
+ return status;
+ }
+ foreground_used = foreground_used || scaled_glyph->recording_uses_foreground_color;
+
+ if (info == CAIRO_SCALED_GLYPH_INFO_COLOR_SURFACE) {
+ _cairo_scaled_glyph_set_color_surface (scaled_glyph,
+ &scaled_font->base,
+ (cairo_image_surface_t *)surface,
+ foreground_used ? foreground_color : NULL);
+ surface = NULL;
+ } else {
_cairo_scaled_glyph_set_surface (scaled_glyph,
&scaled_font->base,
(cairo_image_surface_t *) surface);
+ surface = NULL;
+ }
+
+ if (surface)
+ cairo_surface_destroy (surface);
+
+ return status;
+}
+
+static void
+_cairo_user_scaled_glyph_fini (void *abstract_font)
+{
+ cairo_user_scaled_font_t *scaled_font = abstract_font;
+
+ if (scaled_font->foreground_pattern)
+ cairo_pattern_destroy (scaled_font->foreground_pattern);
+
+ if (scaled_font->foreground_marker)
+ cairo_pattern_destroy (scaled_font->foreground_marker);
+}
+
+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,
+ const cairo_color_t *foreground_color)
+{
+ cairo_int_status_t status = CAIRO_STATUS_SUCCESS;
+ cairo_user_scaled_font_t *scaled_font = abstract_font;
+
+ if (!scaled_glyph->recording_surface || (info & CAIRO_SCALED_GLYPH_INFO_RECORDING_SURFACE)) {
+ status = _cairo_user_scaled_glyph_init_record_glyph (scaled_font, scaled_glyph, foreground_color);
+ if (status)
+ return status;
+ }
+
+ if (info & CAIRO_SCALED_GLYPH_INFO_COLOR_SURFACE) {
+ if (!scaled_glyph->color_glyph )
+ return CAIRO_INT_STATUS_UNSUPPORTED;
+
+ status = _cairo_user_scaled_glyph_init_surface (scaled_font,
+ scaled_glyph,
+ CAIRO_SCALED_GLYPH_INFO_COLOR_SURFACE,
+ foreground_color);
+ if (status)
+ return status;
+ }
+
+ if (info & CAIRO_SCALED_GLYPH_INFO_SURFACE) {
+ status = _cairo_user_scaled_glyph_init_surface (scaled_font,
+ scaled_glyph,
+ CAIRO_SCALED_GLYPH_INFO_SURFACE,
+ NULL);
+ if (status)
+ return status;
}
if (info & CAIRO_SCALED_GLYPH_INFO_PATH) {
@@ -258,7 +416,7 @@ _cairo_user_scaled_glyph_init (void *abstract_font,
if (!path)
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
- status = _cairo_recording_surface_get_path (recording_surface, path);
+ status = _cairo_recording_surface_get_path (scaled_glyph->recording_surface, path);
if (unlikely (status)) {
_cairo_path_fixed_destroy (path);
return status;
@@ -303,6 +461,16 @@ not_implemented:
return glyph;
}
+static cairo_bool_t
+_cairo_user_has_color_glyphs (void *abstract_font)
+{
+ 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;
+
+ return face->has_color;
+}
+
static cairo_int_status_t
_cairo_user_text_to_glyphs (void *abstract_font,
double x,
@@ -377,13 +545,16 @@ _cairo_user_font_face_create_for_toy (cairo_toy_font_face_t *toy_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_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 */
+ NULL, /* index_to_ucs4 */
+ NULL, /* is_synthetic */
+ NULL, /* index_to_glyph_name */
+ NULL, /* load_type1_data */
+ _cairo_user_has_color_glyphs,
};
/* #cairo_user_font_face_t */
@@ -416,6 +587,9 @@ _cairo_user_font_face_scaled_font_create (void *abstract_
return status;
}
+ user_scaled_font->foreground_pattern = NULL;
+ user_scaled_font->foreground_marker = _cairo_pattern_create_foreground_marker ();
+
/* XXX metrics hinting? */
/* compute a normalized version of font scale matrix to compute
@@ -424,6 +598,8 @@ _cairo_user_font_face_scaled_font_create (void *abstract_
{
double fixed_scale, x_scale, y_scale;
+ user_scaled_font->snap_x_scale = 1.0;
+ user_scaled_font->snap_y_scale = 1.0;
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,
@@ -462,8 +638,8 @@ _cairo_user_font_face_scaled_font_create (void *abstract_
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);
+ recording_surface = _cairo_user_scaled_font_create_recording_surface (user_scaled_font, FALSE, NULL);
+ cr = _cairo_user_scaled_font_create_recording_context (user_scaled_font, recording_surface, FALSE);
cairo_surface_destroy (recording_surface);
status = font_face->scaled_font_methods.init (&user_scaled_font->base,
@@ -553,11 +729,11 @@ cairo_user_font_face_create (void)
_cairo_font_face_init (&font_face->base, &_cairo_user_font_face_backend);
font_face->immutable = FALSE;
+ font_face->has_color = 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 */
@@ -598,7 +774,56 @@ cairo_user_font_face_set_init_func (cairo_font_face_t *font_fac
}
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_color_glyph_func:
+ * @font_face: A user font face
+ * @render_glyph_func: The render_glyph callback, or %NULL
+ *
+ * Sets the color 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. At least one of
+ * cairo_user_font_face_set_render_color_glyph_func() or
+ * cairo_user_font_face_set_render_glyph_func() must be called to set
+ * a render callback. If both callbacks are set, the color glyph
+ * render callback is invoked first. If the color glyph render
+ * callback returns %CAIRO_STATUS_USER_FONT_NOT_IMPLEMENTED, the
+ * non-color version of the callback is invoked.
+ *
+ * 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: 1.18
+ **/
+void
+cairo_user_font_face_set_render_color_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_color_glyph = render_glyph_func;
+ user_font_face->has_color = render_glyph_func ? TRUE : FALSE;
+}
/**
* cairo_user_font_face_set_render_glyph_func:
@@ -613,7 +838,15 @@ slim_hidden_def(cairo_user_font_face_set_init_func);
* 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.
+ * The render_glyph callback is the only mandatory callback of a
+ * user-font. At least one of
+ * cairo_user_font_face_set_render_color_glyph_func() or
+ * cairo_user_font_face_set_render_glyph_func() must be called to set
+ * a render callback. If both callbacks are set, the color glyph
+ * render callback is invoked first. If the color glyph render
+ * callback returns %CAIRO_STATUS_USER_FONT_NOT_IMPLEMENTED, the
+ * non-color version of the callback is invoked.
+ *
* If the callback is %NULL and a glyph is tried to be rendered using
* @font_face, a %CAIRO_STATUS_USER_FONT_ERROR will occur.
*
@@ -640,7 +873,6 @@ cairo_user_font_face_set_render_glyph_func (cairo_font_face_t
}
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:
@@ -714,7 +946,6 @@ cairo_user_font_face_set_unicode_to_glyph_func (cairo_font_face_t
}
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 */
@@ -747,6 +978,34 @@ cairo_user_font_face_get_init_func (cairo_font_face_t *font_face)
}
/**
+ * cairo_user_font_face_get_render_color_glyph_func:
+ * @font_face: A user font face
+ *
+ * Gets the color 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: 1.18
+ **/
+cairo_user_scaled_font_render_glyph_func_t
+cairo_user_font_face_get_render_color_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_color_glyph;
+}
+
+/**
* cairo_user_font_face_get_render_glyph_func:
* @font_face: A user font face
*
@@ -829,3 +1088,119 @@ cairo_user_font_face_get_unicode_to_glyph_func (cairo_font_face_t *font_face)
user_font_face = (cairo_user_font_face_t *) font_face;
return user_font_face->scaled_font_methods.unicode_to_glyph;
}
+
+/**
+ * cairo_user_scaled_font_get_foreground_marker:
+ * @scaled_font: A user scaled font
+ *
+ * Gets the foreground pattern of the glyph currently being
+ * rendered. A #cairo_user_scaled_font_render_glyph_func_t function
+ * that has been set with
+ * cairo_user_font_face_set_render_color_glyph_func() may call this
+ * function to retrieve the current foreground pattern for the glyph
+ * being rendered. The function should not be called outside of a
+ * cairo_user_font_face_set_render_color_glyph_func() callback.
+ *
+ * The foreground marker pattern contains an internal marker to
+ * indicate that it is to be substituted with the current source when
+ * rendered to a surface. Querying the foreground marker will reveal a
+ * solid black color, however this is not representative of the color
+ * that will actually be used. Similarly, setting a solid black color
+ * will render black, not the foreground pattern when the glyph is
+ * painted to a surface. Using the foreground marker as the source
+ * instead of cairo_user_scaled_font_get_foreground_source() in a
+ * color render callback has the following benefits:
+ *
+ * 1. Cairo only needs to call the render callback once as it can
+ * cache the recording. Cairo will substitute the actual foreground
+ * color when rendering the recording.
+ *
+ * 2. On backends that have the concept of a foreground color in fonts such as
+ * PDF, PostScript, and SVG, cairo can generate more optimal
+ * output. The glyph can be included in an embedded font.
+ *
+ * The one drawback of the using foreground marker is the render
+ * callback can not access the color components of the pattern as the
+ * actual foreground pattern is not available at the time the render
+ * callback is invoked. If the render callback needs to query the
+ * foreground pattern, use
+ * cairo_user_scaled_font_get_foreground_source().
+ *
+ * If the render callback simply wants to call cairo_set_source() with
+ * the foreground pattern,
+ * cairo_user_scaled_font_get_foreground_marker() is the preferred
+ * function to use as it results in better performance than
+ * cairo_user_scaled_font_get_foreground_source().
+ *
+ * Return value: the current foreground source marker pattern. This
+ * object is owned by cairo. This object must not be modified or used
+ * outside of a color render callback. To keep a reference to it,
+ * you must call cairo_pattern_reference().
+ *
+ * Since: 1.18
+ **/
+cairo_pattern_t *
+cairo_user_scaled_font_get_foreground_marker (cairo_scaled_font_t *scaled_font)
+{
+ cairo_user_scaled_font_t *user_scaled_font;
+
+ if (scaled_font->backend != &_cairo_user_scaled_font_backend)
+ return _cairo_pattern_create_in_error (CAIRO_STATUS_FONT_TYPE_MISMATCH);
+
+ user_scaled_font = (cairo_user_scaled_font_t *)scaled_font;
+ return user_scaled_font->foreground_marker;
+}
+
+/**
+ * cairo_user_scaled_font_get_foreground_source:
+ * @scaled_font: A user scaled font
+ *
+ * Gets the foreground pattern of the glyph currently being
+ * rendered. A #cairo_user_scaled_font_render_glyph_func_t function
+ * that has been set with
+ * cairo_user_font_face_set_render_color_glyph_func() may call this
+ * function to retrieve the current foreground pattern for the glyph
+ * being rendered. The function should not be called outside of a
+ * cairo_user_font_face_set_render_color_glyph_func() callback.
+ *
+ * This function returns the current source at the time the glyph is
+ * rendered. Compared with
+ * cairo_user_scaled_font_get_foreground_marker(), this function
+ * returns the actual source pattern that will be used to render the
+ * glyph. The render callback is free to query the pattern and
+ * extract color components or other pattern data. For example if the
+ * render callback wants to create a gradient stop based on colors in
+ * the foreground source pattern, it will need to use this function in
+ * order to be able to query the colors in the foreground pattern.
+ *
+ * While this function does not have the restrictions on using the
+ * pattern that cairo_user_scaled_font_get_foreground_marker() has, it
+ * does incur a performance penalty. If a render callback calls this
+ * function:
+ *
+ * 1. Cairo will call the render callback whenever the current pattern
+ * of the context in which the glyph is rendered changes.
+ *
+ * 2. On backends that support font embedding (PDF, PostScript, and
+ * SVG), cairo can not embed this glyph in a font. Instead the glyph
+ * will be emitted as an image or sequence of drawing operations each
+ * time it is used.
+ *
+ * Return value: the current foreground source pattern. This object is
+ * owned by cairo. To keep a reference to it, you must call
+ * cairo_pattern_reference().
+ *
+ * Since: 1.18
+ **/
+cairo_pattern_t *
+cairo_user_scaled_font_get_foreground_source (cairo_scaled_font_t *scaled_font)
+{
+ cairo_user_scaled_font_t *user_scaled_font;
+
+ if (scaled_font->backend != &_cairo_user_scaled_font_backend)
+ return _cairo_pattern_create_in_error (CAIRO_STATUS_FONT_TYPE_MISMATCH);
+
+ user_scaled_font = (cairo_user_scaled_font_t *)scaled_font;
+ user_scaled_font->foreground_colors_used = TRUE;
+ return user_scaled_font->foreground_pattern;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-09-10 11:03:07 +0000