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Sync with improvements in the gtk3 version

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Add a grid which shows subpixel phases.
This commit is contained in:
Matthias Clasen
2018-07-28 11:34:28 -04:00
parent 40b90a16ab
commit e781f986f7
2 changed files with 101 additions and 19 deletions
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91
demos/gtk-demo/fontrendering.c
View File

@@ -1,4 +1,4 @@
/* Pango/Font rendering
/* Pango/Font Rendering
*
* Demonstrates variations in font rendering.
*/
@@ -13,10 +13,11 @@ static GtkWidget *hinting = NULL;
static GtkWidget *hint_metrics = NULL;
static GtkWidget *up_button = NULL;
static GtkWidget *down_button = NULL;
static GtkWidget *text_radio = NULL;
static PangoContext *context;
static int scale = 1;
static int scale = 10;
static void
on_destroy (gpointer data)
@@ -70,25 +71,79 @@ update_image (void)
pango_cairo_context_set_font_options (context, fopt);
cairo_font_options_destroy (fopt);
layout = pango_layout_new (context);
pango_layout_set_text (layout, text, -1);
pango_layout_set_font_description (layout, desc);
pango_layout_get_extents (layout, &ink, &logical);
if (gtk_toggle_button_get_active (GTK_TOGGLE_BUTTON (text_radio)))
{
layout = pango_layout_new (context);
pango_layout_set_font_description (layout, desc);
pango_layout_set_text (layout, text, -1);
pango_layout_get_extents (layout, &ink, &logical);
pango_extents_to_pixels (&logical, NULL);
pango_extents_to_pixels (&logical, NULL);
surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, logical.width, logical.height);
cr = cairo_create (surface);
cairo_set_source_rgb (cr, 1, 1, 1);
cairo_paint (cr);
surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
MAX(1,logical.width),
MAX(1,logical.height));
cr = cairo_create (surface);
cairo_set_source_rgb (cr, 1, 1, 1);
cairo_paint (cr);
cairo_set_source_rgb (cr, 0, 0, 0);
pango_cairo_show_layout (cr, layout);
cairo_set_source_rgb (cr, 0, 0, 0);
pango_cairo_show_layout (cr, layout);
cairo_destroy (cr);
cairo_destroy (cr);
g_object_unref (layout);
}
else
{
PangoLayoutIter *iter;
PangoGlyphItem *run;
PangoGlyphInfo *g;
int i, j;
layout = pango_layout_new (context);
pango_layout_set_font_description (layout, desc);
pango_layout_set_text (layout, "aaaa", -1);
pango_layout_get_extents (layout, &ink, &logical);
pango_extents_to_pixels (&logical, NULL);
iter = pango_layout_get_iter (layout);
run = pango_layout_iter_get_run (iter);
surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
MAX(1, logical.width) * 3 / 2,
MAX(1, logical.height) * 4);
cr = cairo_create (surface);
cairo_set_source_rgb (cr, 1, 1, 1);
cairo_paint (cr);
cairo_set_source_rgb (cr, 0, 0, 0);
for (i = 0; i < 4; i++)
{
g = &(run->glyphs->glyphs[i]);
g->geometry.width = PANGO_UNITS_ROUND (g->geometry.width * 3 / 2);
}
for (j = 0; j < 4; j++)
{
for (i = 0; i < 4; i++)
{
g = &(run->glyphs->glyphs[i]);
g->geometry.x_offset = i * (PANGO_SCALE / 4);
g->geometry.y_offset = j * (PANGO_SCALE / 4);
}
cairo_move_to (cr, 0, j * logical.height);
pango_cairo_show_layout (cr, layout);
}
cairo_destroy (cr);
pango_layout_iter_free (iter);
g_object_unref (layout);
}
pixbuf = gdk_pixbuf_get_from_surface (surface, 0, 0, cairo_image_surface_get_width (surface), cairo_image_surface_get_height (surface));
pixbuf2 = gdk_pixbuf_scale_simple (pixbuf, gdk_pixbuf_get_width (pixbuf) * scale, gdk_pixbuf_get_height (pixbuf) * scale, GDK_INTERP_NEAREST);
pixbuf = gdk_pixbuf_get_from_surface (surface, 0, 0, logical.width, logical.height);
pixbuf2 = gdk_pixbuf_scale_simple (pixbuf, logical.width * scale, logical.height * scale, GDK_INTERP_NEAREST);
gtk_picture_set_pixbuf (GTK_PICTURE (image), pixbuf2);
g_object_unref (pixbuf);
@@ -96,8 +151,6 @@ update_image (void)
cairo_surface_destroy (surface);
pango_font_description_free (desc);
}
static void
@@ -145,6 +198,7 @@ do_fontrendering (GtkWidget *do_widget)
image = GTK_WIDGET (gtk_builder_get_object (builder, "image"));
hinting = GTK_WIDGET (gtk_builder_get_object (builder, "hinting"));
hint_metrics = GTK_WIDGET (gtk_builder_get_object (builder, "hint_metrics"));
text_radio = GTK_WIDGET (gtk_builder_get_object (builder, "text_radio"));
g_signal_connect (up_button, "clicked", G_CALLBACK (scale_up), NULL);
g_signal_connect (down_button, "clicked", G_CALLBACK (scale_down), NULL);
@@ -152,6 +206,7 @@ do_fontrendering (GtkWidget *do_widget)
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 (hint_metrics, "notify::active", G_CALLBACK (update_image), NULL);
g_signal_connect (text_radio, "notify::active", G_CALLBACK (update_image), NULL);
update_image ();
}

29
demos/gtk-demo/fontrendering.ui
View File

@@ -130,11 +130,38 @@
<property name="top-attach">0</property>
</packing>
</child>
<child>
<object class="GtkBox">
<property name="orientation">horizontal</property>
<property name="halign">center</property>
<property name="valign">center</property>
<style><class name="linked"/></style>
<child>
<object class="GtkRadioButton" id="text_radio">
<property name="draw-indicator">0</property>
<property name="label">Text</property>
</object>
</child>
<child>
<object class="GtkRadioButton" id="grid_radio">
<property name="draw-indicator">0</property>
<property name="label">Grid</property>
<property name="group">text_radio</property>
</object>
</child>
</object>
<packing>
<property name="left-attach">0</property>
<property name="top-attach">3</property>
<property name="width">7</property>
</packing>
</child>
<child>
<object class="GtkScrolledWindow">
<property name="hscrollbar-policy">automatic</property>
<property name="vscrollbar-policy">automatic</property>
<property name="propagate-natural-height">1</property>
<property name="shadow-type">in</property>
<property name="hexpand">1</property>
<property name="vexpand">1</property>
<child>
@@ -148,7 +175,7 @@
</object>
<packing>
<property name="left-attach">0</property>
<property name="top-attach">3</property>
<property name="top-attach">4</property>
<property name="width">7</property>
</packing>
</child>