[gtk+/wip/ebassi/gsk: 7/11] tests: Add a GSK example

[Emmanuele Bassi <ebassi src gnome org>]

commit d9a2598229a3de17ea0baa642cf9f92a9a242a08
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Mon Mar 16 18:50:22 2015 +0000

    tests: Add a GSK example
    
    To check that the basic API is actually working.

 tests/Makefile.am |    4 ++
 tests/testscene.c |  117 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 121 insertions(+), 0 deletions(-)
---
diff --git a/tests/Makefile.am b/tests/Makefile.am
index 95ac80f..0b66736 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -7,6 +7,8 @@ AM_CPPFLAGS =                           \
        -I$(top_srcdir)                 \
        -I$(top_builddir)/gdk           \
        -I$(top_srcdir)/gdk             \
+       -I$(top_builddir)/gsk           \
+       -I$(top_srcdir)/gsk             \
        $(GTK_DEBUG_FLAGS)              \
        $(GTK_DEP_CFLAGS)               \
        $(GDK_DEP_CFLAGS)
@@ -16,6 +18,7 @@ DEPS = \
 
 LDADD = \
        $(top_builddir)/gtk/libgtk-3.la \
+       $(top_builddir)/gsk/libgsk-3.la \
        $(top_builddir)/gdk/libgdk-3.la \
        $(GTK_DEP_LIBS)                 \
        $(GDK_DEP_LIBS)                 \
@@ -110,6 +113,7 @@ noinst_PROGRAMS =  $(TEST_PROGS)    \
        testrecentchoosermenu           \
        testrichtext                    \
        testscale                       \
+       testscene                       \
        testselection                   \
        testselectionmode               \
        $(testsocket_programs)          \
diff --git a/tests/testscene.c b/tests/testscene.c
new file mode 100644
index 0000000..3fa69a1
--- /dev/null
+++ b/tests/testscene.c
@@ -0,0 +1,117 @@
+#include <math.h>
+#include <stdlib.h>
+#include <gtk/gtk.h>
+
+enum { RED, GREEN, BLUE, N_COLORS };
+
+static GdkRGBA layer_colors[N_COLORS] = {
+  { 1.0, 0.0, 0.0, 1.0 },
+  { 0.0, 1.0, 0.0, 1.0 },
+  { 0.0, 0.0, 1.0, 1.0 },
+};
+
+static void
+update_scene (GskLayer *root)
+{
+  GskLayerIter iter;
+  GskLayer *child;
+  graphene_rect_t bounds;
+  float offsets[] = { 0.25, 0.5, 0.75 };
+  int i = 0;
+
+  gsk_layer_get_bounds (root, &bounds);
+
+  gsk_layer_iter_init (&iter, root);
+  while (gsk_layer_iter_next (&iter, &child))
+    {
+      graphene_point_t pos;
+
+      graphene_point_init (&pos,
+                           bounds.size.width * offsets[i],
+                           bounds.size.height * offsets[i]);
+
+      gsk_layer_set_position (child, &pos);
+
+      i += 1;
+    }
+}
+
+static void
+build_scene (GskLayer *root)
+{
+  graphene_rect_t bounds = GRAPHENE_RECT_INIT (0, 0, 100, 100);
+  graphene_rect_t root_bounds;
+  float offsets[] = { 0.25, 0.5, 0.75 };
+  int i;
+
+  gsk_layer_set_opacity (root, 0.5);
+
+  g_signal_connect (root, "layout-children", G_CALLBACK (update_scene), NULL);
+
+  gsk_layer_get_bounds (root, &root_bounds);
+
+  for (i = 0; i < N_COLORS; i++)
+    {
+      float x = root_bounds.size.width * offsets[i];
+      float y = root_bounds.size.height * offsets[i];
+      graphene_euler_t rot;
+      graphene_point_t tmp;
+      GskLayer *layer;
+
+      graphene_euler_init (&rot, 0, 0, -g_random_double_range (0, 360));
+
+      layer = gsk_layer_new ();
+      gsk_layer_set_background_color (layer, &layer_colors[i]);
+      gsk_layer_set_opacity (layer, offsets[i]);
+      gsk_layer_set_bounds (layer, &bounds);
+      gsk_layer_set_position (layer, graphene_point_init (&tmp, x, y));
+      gsk_layer_set_scale (layer, offsets[i], offsets[i]);
+      gsk_layer_set_rotation (layer, &rot);
+
+      gsk_layer_add_child (root, layer);
+    }
+}
+
+int
+main (int argc, char *argv[])
+{
+  GtkWidget *window, *box, *area, *button;
+
+  gtk_init (&argc, &argv);
+
+  /* create a new pixel format; we use this to configure the
+   * GL context, and to check for features
+   */
+
+  window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
+  gtk_window_set_title (GTK_WINDOW (window), "GSK");
+  gtk_window_set_default_size (GTK_WINDOW (window), 400, 600);
+  gtk_container_set_border_width (GTK_CONTAINER (window), 12);
+  g_signal_connect (window, "destroy", G_CALLBACK (gtk_main_quit), NULL);
+
+  box = gtk_box_new (GTK_ORIENTATION_VERTICAL, FALSE);
+  gtk_box_set_spacing (GTK_BOX (box), 6);
+  gtk_container_add (GTK_CONTAINER (window), box);
+  gtk_widget_show (box);
+
+  area = gtk_drawing_area_new ();
+  gtk_widget_set_hexpand (area, TRUE);
+  gtk_widget_set_vexpand (area, TRUE);
+  gtk_widget_set_has_layer (area, TRUE);
+  gtk_container_add (GTK_CONTAINER (box), area);
+  gtk_widget_show (area);
+
+  build_scene (gtk_widget_get_layer (area));
+
+  button = gtk_button_new_with_mnemonic ("_Quit");
+  gtk_widget_set_hexpand (button, TRUE);
+  gtk_container_add (GTK_CONTAINER (box), button);
+  g_signal_connect_swapped (button, "clicked", G_CALLBACK (gtk_widget_destroy), window);
+  gtk_widget_show (button);
+
+  gtk_widget_show (window);
+
+  gtk_main ();
+
+  return EXIT_SUCCESS;
+}