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Make devicepixels center its image

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Also, add a fullscreen toggle action.
This commit is contained in:
Matthias Clasen 2024-02-08 15:31:38 -05:00
parent 6c6577dd6b
commit da024cfc90
1 changed files with 43 additions and 10 deletions
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53
tests/devicepixels.c
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@ -66,31 +66,41 @@ demo_image_snapshot (GtkWidget *widget,
double x, y, width, height;
g_print ("snapshot\n");
scale = gdk_surface_get_scale (gtk_native_get_surface (native));
g_print ("scale %f\n", scale);
/* width and height that give us 1-1 mapping to device pixels */
width = gdk_texture_get_width (demo->texture) / scale;
height = gdk_texture_get_height (demo->texture) / scale;
gtk_native_get_surface_transform (native, &ox, &oy);
g_print ("surface transform %f %f\n", ox, oy);
if (!gtk_widget_compute_point (widget, GTK_WIDGET (native), &GRAPHENE_POINT_INIT (0, 0), &point))
x = (gtk_widget_get_width (widget) - width) / 2;
y = (gtk_widget_get_height (widget) - height) / 2;
g_print ("texture origin in widget coordinates: %f %f\n", x, y);
if (!gtk_widget_compute_point (widget, GTK_WIDGET (native), &GRAPHENE_POINT_INIT (x, y), &point))
return;
x = point.x;
y = point.y;
g_print ("window (app) coordinates: %f %f\n", x, y);
g_print ("in window (app) coordinates: %f %f\n", x, y);
x += ox;
y += oy;
g_print ("surface (app) coordinates: %f %f\n", x, y);
g_print ("in surface (app) coordinates: %f %f\n", x, y);
x *= scale;
y *= scale;
g_print ("surface (device) coordinates: %f %f\n", x, y);
g_print ("in surface (device) coordinates: %f %f\n", x, y);
/* Now x, y are the surface (device) coordinates of the widget's origin */
@ -109,14 +119,12 @@ demo_image_snapshot (GtkWidget *widget,
x -= ox;
y -= oy;
if (!gtk_widget_compute_point (widget, GTK_WIDGET (native), &GRAPHENE_POINT_INIT (0, 0), &point))
return;
x -= point.x;
y -= point.y;
/* width and height that give us 1-1 mapping to device pixels */
width = gdk_texture_get_width (demo->texture) / scale;
height = gdk_texture_get_height (demo->texture) / scale;
g_print ("bounds: %f %f %f %f\n", x, y, width, height);
gtk_snapshot_append_texture (snapshot, demo->texture,
@ -225,12 +233,31 @@ make_checkerboard_texture (int width, int height)
return texture;
}
static gboolean
toggle_fullscreen (GtkWidget *widget,
GVariant *args,
gpointer data)
{
GtkWindow *window = GTK_WINDOW (widget);
if (gtk_window_is_fullscreen (window))
gtk_window_unfullscreen (window);
else
gtk_window_fullscreen (window);
return TRUE;
}
int
main (int argc, char *argv[])
{
GtkWidget *window;
GdkTexture *texture;
GError *error = NULL;
GtkEventController *controller;
GtkShortcutTrigger *trigger;
GtkShortcutAction *action;
GtkShortcut *shortcut;
gtk_init ();
@ -246,7 +273,13 @@ main (int argc, char *argv[])
}
window = gtk_window_new ();
gtk_window_set_default_size (GTK_WINDOW (window), 797, 601);
controller = gtk_shortcut_controller_new ();
trigger = gtk_keyval_trigger_new (GDK_KEY_F11, GDK_NO_MODIFIER_MASK);
action = gtk_callback_action_new (toggle_fullscreen, NULL, NULL);
shortcut = gtk_shortcut_new (trigger, action);
gtk_shortcut_controller_add_shortcut (GTK_SHORTCUT_CONTROLLER (controller), shortcut);
gtk_widget_add_controller (window, controller);
gtk_window_set_child (GTK_WINDOW (window), demo_image_new (texture));