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gtk-demo: Improve the font rendering demo

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Add a toggle for antialiasing, and make the metrics
hinting turn on rounding of positions, to match what
we do with settings now.
This commit is contained in:
Matthias Clasen 2021-09-03 00:19:17 -04:00
parent 44fea33c5d
commit f3ccf62463
2 changed files with 20 additions and 0 deletions
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11
demos/gtk-demo/fontrendering.c
View File

@ -10,6 +10,7 @@ static GtkWidget *font_button = NULL;
static GtkWidget *entry = NULL;
static GtkWidget *image = NULL;
static GtkWidget *hinting = NULL;
static GtkWidget *anti_alias = NULL;
static GtkWidget *hint_metrics = NULL;
static GtkWidget *up_button = NULL;
static GtkWidget *down_button = NULL;
@ -37,6 +38,7 @@ update_image (void)
cairo_font_options_t *fopt;
cairo_hint_style_t hintstyle;
cairo_hint_metrics_t hintmetrics;
cairo_antialias_t antialias;
if (!context)
context = gtk_widget_create_pango_context (image);
@ -65,6 +67,13 @@ update_image (void)
hintmetrics = CAIRO_HINT_METRICS_OFF;
cairo_font_options_set_hint_metrics (fopt, hintmetrics);
if (gtk_check_button_get_active (GTK_CHECK_BUTTON (anti_alias)))
antialias = CAIRO_ANTIALIAS_GRAY;
else
antialias = CAIRO_ANTIALIAS_NONE;
cairo_font_options_set_antialias (fopt, antialias);
pango_context_set_round_glyph_positions (context, hintmetrics == CAIRO_HINT_METRICS_ON);
pango_cairo_context_set_font_options (context, fopt);
cairo_font_options_destroy (fopt);
pango_context_changed (context);
@ -252,6 +261,7 @@ do_fontrendering (GtkWidget *do_widget)
entry = GTK_WIDGET (gtk_builder_get_object (builder, "entry"));
image = GTK_WIDGET (gtk_builder_get_object (builder, "image"));
hinting = GTK_WIDGET (gtk_builder_get_object (builder, "hinting"));
anti_alias = GTK_WIDGET (gtk_builder_get_object (builder, "antialias"));
hint_metrics = GTK_WIDGET (gtk_builder_get_object (builder, "hint_metrics"));
text_radio = GTK_WIDGET (gtk_builder_get_object (builder, "text_radio"));
show_grid = GTK_WIDGET (gtk_builder_get_object (builder, "show_grid"));
@ -262,6 +272,7 @@ do_fontrendering (GtkWidget *do_widget)
g_signal_connect (entry, "notify::text", G_CALLBACK (update_image), NULL);
g_signal_connect (font_button, "notify::font-desc", G_CALLBACK (update_image), NULL);
g_signal_connect (hinting, "notify::active", G_CALLBACK (update_image), NULL);
g_signal_connect (anti_alias, "notify::active", G_CALLBACK (update_image), NULL);
g_signal_connect (hint_metrics, "notify::active", G_CALLBACK (update_image), NULL);
g_signal_connect (text_radio, "notify::active", G_CALLBACK (update_image), NULL);
g_signal_connect (show_grid, "notify::active", G_CALLBACK (update_image), NULL);

9
demos/gtk-demo/fontrendering.ui
View File

@ -98,6 +98,15 @@
</layout>
</object>
</child>
<child>
<object class="GtkCheckButton" id="antialias">
<property name="label">Antialias</property>
<layout>
<property name="column">3</property>
<property name="row">1</property>
</layout>
</object>
</child>
<child>
<object class="GtkComboBoxText" id="hinting">
<property name="active">0</property>