static const gchar *
get_sample_string (FT_Face face)
{
const gchar *text;
text = pango_language_get_sample_string (NULL);
if (!check_font_contain_text (face, text)) {
text = pango_language_get_sample_string (pango_language_from_string ("en_US"));
}
return text;
}
static PangoFontMetrics *
create_metrics_for_context (PangoFont *font,
PangoContext *context)
{
PangoCairoWin32Font *cwfont = PANGO_CAIRO_WIN32_FONT (font);
PangoFontMetrics *metrics;
PangoFontDescription *font_desc;
PangoLayout *layout;
PangoRectangle extents;
PangoLanguage *language = pango_context_get_language (context);
const char *sample_str = pango_language_get_sample_string (language);
cairo_scaled_font_t *scaled_font;
cairo_font_extents_t font_extents;
double height;
metrics = pango_font_metrics_new ();
scaled_font = pango_cairo_win32_font_get_scaled_font (PANGO_CAIRO_FONT (cwfont));
cairo_scaled_font_extents (scaled_font, &font_extents);
cairo_win32_scaled_font_done_font (scaled_font);
metrics->ascent = font_extents.ascent * PANGO_SCALE;
metrics->descent = font_extents.descent * PANGO_SCALE;
/* FIXME: Should get the real settings for these from the TrueType
* font file.
*/
height = metrics->ascent + metrics->descent;
metrics->underline_thickness = height / 14;
metrics->underline_position = - metrics->underline_thickness;
metrics->strikethrough_thickness = metrics->underline_thickness;
metrics->strikethrough_position = height / 4;
pango_quantize_line_geometry (&metrics->underline_thickness,
&metrics->underline_position);
pango_quantize_line_geometry (&metrics->strikethrough_thickness,
&metrics->strikethrough_position);
layout = pango_layout_new (context);
font_desc = pango_font_describe_with_absolute_size (font);
pango_layout_set_font_description (layout, font_desc);
pango_layout_set_text (layout, sample_str, -1);
pango_layout_get_extents (layout, NULL, &extents);
metrics->approximate_char_width = extents.width / g_utf8_strlen (sample_str, -1);
pango_layout_set_text (layout, "0123456789", -1);
metrics->approximate_digit_width = max_glyph_width (layout);
pango_font_description_free (font_desc);
g_object_unref (layout);
return metrics;
}
static gboolean
set_pango_sample_string (SushiFontWidget *self)
{
const gchar *sample_string;
gboolean retval = FALSE;
sample_string = pango_language_get_sample_string (pango_language_from_string (NULL));
if (check_font_contain_text (self->priv->face, sample_string))
retval = TRUE;
if (!retval) {
sample_string = pango_language_get_sample_string (pango_language_from_string ("C"));
if (check_font_contain_text (self->priv->face, sample_string))
retval = TRUE;
}
if (retval) {
g_free (self->priv->sample_string);
self->priv->sample_string = g_strdup (sample_string);
}
return retval;
}
static PangoFontMetrics *
pango_cairo_win32_font_get_metrics (PangoFont *font,
PangoLanguage *language)
{
PangoWin32Font *win32font = PANGO_WIN32_FONT (font);
PangoCairoWin32Font *cwfont = PANGO_CAIRO_WIN32_FONT (font);
PangoWin32MetricsInfo *info = NULL; /* Quiet gcc */
GSList *tmp_list;
const char *sample_str = pango_language_get_sample_string (language);
tmp_list = cwfont->metrics_by_lang;
while (tmp_list)
{
info = tmp_list->data;
if (info->sample_str == sample_str) /* We _don't_ need strcmp */
break;
tmp_list = tmp_list->next;
}
if (!tmp_list)
{
PangoContext *context;
if (!win32font->fontmap)
return pango_font_metrics_new ();
info = g_slice_new0 (PangoWin32MetricsInfo);
cwfont->metrics_by_lang = g_slist_prepend (cwfont->metrics_by_lang,
info);
info->sample_str = sample_str;
context = pango_context_new ();
pango_context_set_font_map (context, win32font->fontmap);
pango_context_set_language (context, language);
pango_cairo_context_set_font_options (context, cwfont->options);
info->metrics = create_metrics_for_context (font, context);
g_object_unref (context);
}
return pango_font_metrics_ref (info->metrics);
}
static PangoFontMetrics *
pango_cairo_core_text_font_create_base_metrics_for_context (PangoCairoFont *font,
PangoContext *context)
{
PangoCoreTextFont *cfont = (PangoCoreTextFont *) font;
PangoFontMetrics *metrics;
PangoFontDescription *font_desc;
PangoLayout *layout;
PangoRectangle extents;
PangoLanguage *language = pango_context_get_language (context);
const char *sample_str = pango_language_get_sample_string (language);
CTFontRef ctfont;
metrics = pango_font_metrics_new ();
ctfont = pango_core_text_font_get_ctfont (cfont);
metrics->ascent = CTFontGetAscent (ctfont) * PANGO_SCALE;
metrics->descent = CTFontGetDescent (ctfont) * PANGO_SCALE;
metrics->underline_position = CTFontGetUnderlinePosition (ctfont) * PANGO_SCALE;
metrics->underline_thickness = CTFontGetUnderlineThickness (ctfont) * PANGO_SCALE;
metrics->strikethrough_position = metrics->ascent / 3;
metrics->strikethrough_thickness = CTFontGetUnderlineThickness (ctfont) * PANGO_SCALE;
layout = pango_layout_new (context);
font_desc = pango_font_describe_with_absolute_size ((PangoFont *) font);
pango_layout_set_font_description (layout, font_desc);
pango_layout_set_text (layout, sample_str, -1);
pango_layout_get_extents (layout, NULL, &extents);
metrics->approximate_char_width = extents.width / pango_utf8_strwidth (sample_str);
pango_layout_set_text (layout, "0123456789", -1);
metrics->approximate_digit_width = max_glyph_width (layout);
pango_font_description_free (font_desc);
g_object_unref (layout);
return metrics;
}
static void
gtk_font_chooser_default_init (GtkFontChooserInterface *iface)
{
/**
* GtkFontChooser:font:
*
* The font description as a string, e.g. "Sans Italic 12".
*/
g_object_interface_install_property
(iface,
g_param_spec_string ("font",
P_("Font"),
P_("Font description as a string, e.g. \"Sans Italic 12\""),
GTK_FONT_CHOOSER_DEFAULT_FONT_NAME,
GTK_PARAM_READWRITE));
/**
* GtkFontChooser:font-desc:
*
* The font description as a #PangoFontDescription.
*/
g_object_interface_install_property
(iface,
g_param_spec_boxed ("font-desc",
P_("Font description"),
P_("Font description as a PangoFontDescription struct"),
PANGO_TYPE_FONT_DESCRIPTION,
GTK_PARAM_READWRITE));
/**
* GtkFontChooser:preview-text:
*
* The string with which to preview the font.
*/
g_object_interface_install_property
(iface,
g_param_spec_string ("preview-text",
P_("Preview text"),
P_("The text to display in order to demonstrate the selected font"),
pango_language_get_sample_string (NULL),
GTK_PARAM_READWRITE));
/**
* GtkFontChooser:show-preview-entry:
*
* Whether to show an entry to change the preview text.
*/
g_object_interface_install_property
(iface,
g_param_spec_boolean ("show-preview-entry",
P_("Show preview text entry"),
P_("Whether the preview text entry is shown or not"),
TRUE,
GTK_PARAM_READWRITE));
/**
* GtkFontChooser::font-activated:
* @self: the object which received the signal
* @fontname: the font name
*
* Emitted when a font is activated.
* This usually happens when the user double clicks an item,
* or an item is selected and the user presses one of the keys
* Space, Shift+Space, Return or Enter.
*/
chooser_signals[SIGNAL_FONT_ACTIVATED] =
g_signal_new ("font-activated",
GTK_TYPE_FONT_CHOOSER,
G_SIGNAL_RUN_FIRST,
G_STRUCT_OFFSET (GtkFontChooserIface, font_activated),
NULL, NULL,
NULL,
G_TYPE_NONE,
1, G_TYPE_STRING);
}
static GdkPixmap *
create_text_pixmap(GtkWidget *drawing_area, FT_Face face)
{
gint i, pixmap_width, pixmap_height, pos_y, textlen;
GdkPixmap *pixmap = NULL;
const gchar *text;
Display *xdisplay;
Drawable xdrawable;
Visual *xvisual;
Colormap xcolormap;
XftDraw *draw;
XftColor colour;
XGlyphInfo extents;
XftFont *font;
gint *sizes = NULL, n_sizes, alpha_size;
FcCharSet *charset = NULL;
cairo_t *cr;
GdkWindow *window = gtk_widget_get_window (drawing_area);
text = pango_language_get_sample_string(NULL);
if (! check_font_contain_text (face, text))
{
pango_language_get_sample_string (pango_language_from_string ("en_US"));
}
textlen = strlen(text);
/* create the XftDraw */
xdisplay = GDK_PIXMAP_XDISPLAY(window);
#if GTK_CHECK_VERSION(3, 0, 0)
xvisual = GDK_VISUAL_XVISUAL(gdk_window_get_visual(window));
#else
xvisual = GDK_VISUAL_XVISUAL(gdk_drawable_get_visual(window));
#endif
xcolormap = GDK_COLORMAP_XCOLORMAP(gdk_drawable_get_colormap(window));
XftColorAllocName(xdisplay, xvisual, xcolormap, "black", &colour);
/* work out what sizes to render */
if (FT_IS_SCALABLE(face)) {
n_sizes = 8;
sizes = g_new(gint, n_sizes);
sizes[0] = 8;
sizes[1] = 10;
sizes[2] = 12;
sizes[3] = 18;
sizes[4] = 24;
sizes[5] = 36;
sizes[6] = 48;
sizes[7] = 72;
alpha_size = 24;
} else {
/* use fixed sizes */
n_sizes = face->num_fixed_sizes;
sizes = g_new(gint, n_sizes);
alpha_size = 0;
for (i = 0; i < face->num_fixed_sizes; i++) {
sizes[i] = face->available_sizes[i].height;
/* work out which font size to render */
if (face->available_sizes[i].height <= 24)
alpha_size = face->available_sizes[i].height;
}
}
/* calculate size of pixmap to use (with 4 pixels padding) ... */
pixmap_width = 8;
pixmap_height = 8;
font = get_font(xdisplay, face, alpha_size, charset);
charset = FcCharSetCopy (font->charset);
XftTextExtentsUtf8(xdisplay, font,
(guchar *)lowercase_text, strlen(lowercase_text), &extents);
pixmap_height += extents.height + 4;
pixmap_width = MAX(pixmap_width, 8 + extents.width);
XftTextExtentsUtf8(xdisplay, font,
(guchar *)uppercase_text, strlen(uppercase_text), &extents);
pixmap_height += extents.height + 4;
pixmap_width = MAX(pixmap_width, 8 + extents.width);
XftTextExtentsUtf8(xdisplay, font,
(guchar *)punctuation_text, strlen(punctuation_text), &extents);
pixmap_height += extents.height + 4;
pixmap_width = MAX(pixmap_width, 8 + extents.width);
XftFontClose(xdisplay, font);
pixmap_height += 8;
for (i = 0; i < n_sizes; i++) {
font = get_font(xdisplay, face, sizes[i], charset);
if (!font) continue;
XftTextExtentsUtf8(xdisplay, font, (guchar *)text, textlen, &extents);
pixmap_height += extents.height + 4;
pixmap_width = MAX(pixmap_width, 8 + extents.width);
XftFontClose(xdisplay, font);
}
/* create pixmap */
gtk_widget_set_size_request(drawing_area, pixmap_width, pixmap_height);
pixmap = gdk_pixmap_new(window,
pixmap_width, pixmap_height, -1);
if (!pixmap)
goto end;
cr = gdk_cairo_create (pixmap);
cairo_set_source_rgb (cr, 1, 1, 1);
cairo_paint (cr);
cairo_destroy (cr);
xdrawable = GDK_DRAWABLE_XID(pixmap);
draw = XftDrawCreate(xdisplay, xdrawable, xvisual, xcolormap);
/* draw text */
pos_y = 4;
font = get_font(xdisplay, face, alpha_size, charset);
draw_string(xdisplay, draw, font, &colour, lowercase_text, &pos_y);
draw_string(xdisplay, draw, font, &colour, uppercase_text, &pos_y);
draw_string(xdisplay, draw, font, &colour, punctuation_text, &pos_y);
XftFontClose(xdisplay, font);
pos_y += 8;
for (i = 0; i < n_sizes; i++) {
font = get_font(xdisplay, face, sizes[i], charset);
if (!font) continue;
draw_string(xdisplay, draw, font, &colour, text, &pos_y);
XftFontClose(xdisplay, font);
}
g_signal_connect(drawing_area, "expose-event", G_CALLBACK(expose_event),
pixmap);
end:
g_free(sizes);
FcCharSetDestroy (charset);
return pixmap;
}
PangoFontMetrics *
_pango_cairo_font_get_metrics (PangoFont *font,
PangoLanguage *language)
{
PangoCairoFont *cfont = (PangoCairoFont *) font;
PangoCairoFontPrivate *cf_priv = PANGO_CAIRO_FONT_PRIVATE (font);
PangoCairoFontMetricsInfo *info = NULL; /* Quiet gcc */
GSList *tmp_list;
const char *sample_str = pango_language_get_sample_string (language);
tmp_list = cf_priv->metrics_by_lang;
while (tmp_list)
{
info = tmp_list->data;
if (info->sample_str == sample_str) /* We _don't_ need strcmp */
break;
tmp_list = tmp_list->next;
}
if (!tmp_list)
{
PangoFontMap *fontmap;
PangoContext *context;
cairo_font_options_t *font_options;
int height, shift;
/* XXX this is racy. need a ref'ing getter... */
fontmap = pango_font_get_font_map (font);
if (!fontmap)
return pango_font_metrics_new ();
fontmap = g_object_ref (fontmap);
info = g_slice_new0 (PangoCairoFontMetricsInfo);
cf_priv->metrics_by_lang = g_slist_prepend (cf_priv->metrics_by_lang, info);
info->sample_str = sample_str;
context = pango_font_map_create_context (fontmap);
pango_context_set_language (context, language);
font_options = cairo_font_options_create ();
cairo_scaled_font_get_font_options (_pango_cairo_font_private_get_scaled_font (cf_priv), font_options);
pango_cairo_context_set_font_options (context, font_options);
cairo_font_options_destroy (font_options);
info->metrics = (* PANGO_CAIRO_FONT_GET_IFACE (font)->create_metrics_for_context) (cfont, context);
/* We may actually reuse ascent/descent we got from cairo here. that's
* in cf_priv->font_extents.
*/
height = info->metrics->ascent + info->metrics->descent;
switch (cf_priv->gravity)
{
default:
case PANGO_GRAVITY_AUTO:
case PANGO_GRAVITY_SOUTH:
break;
case PANGO_GRAVITY_NORTH:
info->metrics->ascent = info->metrics->descent;
break;
case PANGO_GRAVITY_EAST:
case PANGO_GRAVITY_WEST:
{
int ascent = height / 2;
if (cf_priv->is_hinted)
ascent = PANGO_UNITS_ROUND (ascent);
info->metrics->ascent = ascent;
}
}
shift = (height - info->metrics->ascent) - info->metrics->descent;
info->metrics->descent += shift;
info->metrics->underline_position -= shift;
info->metrics->strikethrough_position -= shift;
info->metrics->ascent = height - info->metrics->descent;
g_object_unref (context);
g_object_unref (fontmap);
}
return pango_font_metrics_ref (info->metrics);
}
PangoFontMetrics *
_pango_cairo_font_get_metrics (PangoFont *font,
PangoLanguage *language)
{
PangoCairoFont *cfont = (PangoCairoFont *) font;
PangoCairoFontPrivate *cf_priv = PANGO_CAIRO_FONT_PRIVATE (font);
PangoCairoFontMetricsInfo *info = NULL; /* Quiet gcc */
GSList *tmp_list;
const char *sample_str = pango_language_get_sample_string (language);
tmp_list = cf_priv->metrics_by_lang;
while (tmp_list)
{
info = tmp_list->data;
if (info->sample_str == sample_str) /* We _don't_ need strcmp */
break;
tmp_list = tmp_list->next;
}
if (!tmp_list)
{
PangoFontMap *fontmap;
PangoContext *context;
cairo_font_options_t *font_options;
PangoLayout *layout;
PangoRectangle extents;
PangoFontDescription *desc;
cairo_scaled_font_t *scaled_font;
cairo_matrix_t cairo_matrix;
PangoMatrix pango_matrix;
PangoMatrix identity = PANGO_MATRIX_INIT;
int height, shift;
/* XXX this is racy. need a ref'ing getter... */
fontmap = pango_font_get_font_map (font);
if (!fontmap)
return pango_font_metrics_new ();
fontmap = g_object_ref (fontmap);
info = g_slice_new0 (PangoCairoFontMetricsInfo);
cf_priv->metrics_by_lang = g_slist_prepend (cf_priv->metrics_by_lang, info);
info->sample_str = sample_str;
scaled_font = _pango_cairo_font_private_get_scaled_font (cf_priv);
context = pango_font_map_create_context (fontmap);
pango_context_set_language (context, language);
font_options = cairo_font_options_create ();
cairo_scaled_font_get_font_options (scaled_font, font_options);
pango_cairo_context_set_font_options (context, font_options);
cairo_font_options_destroy (font_options);
info->metrics = (* PANGO_CAIRO_FONT_GET_IFACE (font)->create_base_metrics_for_context) (cfont, context);
/* We now need to adjust the base metrics for ctm */
cairo_scaled_font_get_ctm (scaled_font, &cairo_matrix);
pango_matrix.xx = cairo_matrix.xx;
pango_matrix.yx = cairo_matrix.yx;
pango_matrix.xy = cairo_matrix.xy;
pango_matrix.yy = cairo_matrix.yy;
pango_matrix.x0 = 0;
pango_matrix.y0 = 0;
if (G_UNLIKELY (0 != memcmp (&identity, &pango_matrix, 4 * sizeof (double))))
{
double xscale = pango_matrix_get_font_scale_factor (&pango_matrix);
if (xscale) xscale = 1 / xscale;
info->metrics->ascent *= xscale;
info->metrics->descent *= xscale;
info->metrics->underline_position *= xscale;
info->metrics->underline_thickness *= xscale;
info->metrics->strikethrough_position *= xscale;
info->metrics->strikethrough_thickness *= xscale;
}
/* Set the matrix on the context so we don't have to adjust the derived
* metrics. */
pango_context_set_matrix (context, &pango_matrix);
/* Update approximate_*_width now */
layout = pango_layout_new (context);
desc = pango_font_describe_with_absolute_size (font);
pango_layout_set_font_description (layout, desc);
pango_font_description_free (desc);
pango_layout_set_text (layout, sample_str, -1);
pango_layout_get_extents (layout, NULL, &extents);
info->metrics->approximate_char_width = extents.width / pango_utf8_strwidth (sample_str);
pango_layout_set_text (layout, "0123456789", -1);
info->metrics->approximate_digit_width = max_glyph_width (layout);
g_object_unref (layout);
/* We may actually reuse ascent/descent we got from cairo here. that's
* in cf_priv->font_extents.
*/
height = info->metrics->ascent + info->metrics->descent;
switch (cf_priv->gravity)
{
default:
case PANGO_GRAVITY_AUTO:
case PANGO_GRAVITY_SOUTH:
break;
case PANGO_GRAVITY_NORTH:
info->metrics->ascent = info->metrics->descent;
break;
case PANGO_GRAVITY_EAST:
case PANGO_GRAVITY_WEST:
{
int ascent = height / 2;
if (cf_priv->is_hinted)
ascent = PANGO_UNITS_ROUND (ascent);
info->metrics->ascent = ascent;
}
}
shift = (height - info->metrics->ascent) - info->metrics->descent;
info->metrics->descent += shift;
info->metrics->underline_position -= shift;
info->metrics->strikethrough_position -= shift;
info->metrics->ascent = height - info->metrics->descent;
g_object_unref (context);
g_object_unref (fontmap);
}
return pango_font_metrics_ref (info->metrics);
}