[pyclutter] examples: Add image content example

[Emmanuele Bassi <ebassi src gnome org>]

commit 84fabff130ac1574e8e16088dc02c39b415b9583
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Thu Apr 16 11:48:38 2015 +0100

    examples: Add image content example

 examples/Makefile.am      |    4 ++-
 examples/image-content.py |   76 +++++++++++++++++++++++++++++++++++++++++++++
 examples/redhand.png      |  Bin 0 -> 8250 bytes
 3 files changed, 79 insertions(+), 1 deletions(-)
---
diff --git a/examples/Makefile.am b/examples/Makefile.am
index 0bffc87..33c761f 100644
--- a/examples/Makefile.am
+++ b/examples/Makefile.am
@@ -2,6 +2,8 @@ EXTRA_DIST = \
        basic-actor.py \
        canvas.py \
        constraints.py \
+       image-content.py \
        layout-manager.py \
        rounded-rectangle.py \
-       scroll-actor.py
+       scroll-actor.py \
+       redhand.png
diff --git a/examples/image-content.py b/examples/image-content.py
new file mode 100644
index 0000000..2698ad2
--- /dev/null
+++ b/examples/image-content.py
@@ -0,0 +1,76 @@
+# Clutter depends on Cogl 1.0 for public API, but Cogl ships with
+# introspection data for both 1.0 and 2.0; pygobject will prefer
+# the latter, so we need to explicitly version the Cogl module
+# before loading it
+import gi
+gi.require_version('Cogl', '1.0')
+
+from gi.repository import Cogl
+from gi.repository import Clutter
+from gi.repository import GdkPixbuf
+
+gravities = [
+    ( Clutter.ContentGravity.TOP_LEFT, 'Top Left' ),
+    ( Clutter.ContentGravity.TOP, 'Top' ),
+    ( Clutter.ContentGravity.TOP_RIGHT, 'Top Right' ),
+
+    ( Clutter.ContentGravity.LEFT, 'Left' ),
+    ( Clutter.ContentGravity.CENTER, 'Center' ),
+    ( Clutter.ContentGravity.RIGHT, 'Right' ),
+
+    ( Clutter.ContentGravity.BOTTOM_LEFT, 'Bottom Left' ),
+    ( Clutter.ContentGravity.BOTTOM, 'Bottom' ),
+    ( Clutter.ContentGravity.BOTTOM_RIGHT, 'Bottom Right' ),
+
+    ( Clutter.ContentGravity.RESIZE_FILL, 'Resize Fill' ),
+    ( Clutter.ContentGravity.RESIZE_ASPECT, 'Resize Aspect' )
+]
+
+current_gravity = 0
+
+def on_tap(action, actor, text):
+    global gravities, current_gravity
+
+    with actor.easing_state():
+        actor.set_content_gravity(gravities[current_gravity][0])
+
+    text.props.text = 'Content Gravity: ' + gravities[current_gravity][1]
+
+    current_gravity += 1
+    if current_gravity >= len(gravities):
+        current_gravity = 0
+
+if __name__ == '__main__':
+    stage = Clutter.Stage(title='Content Box', user_resizable=True)
+    stage.set_margin(Clutter.Margin(12))
+    stage.connect('destroy', Clutter.main_quit)
+    stage.show()
+
+    pixbuf = GdkPixbuf.Pixbuf.new_from_file('redhand.png')
+
+    pixel_format = Cogl.PixelFormat.RGB_888
+    if pixbuf.get_has_alpha():
+        pixel_format = Cogl.PixelFormat.RGBA_8888
+
+    width = pixbuf.get_width()
+    height = pixbuf.get_height()
+    stride = pixbuf.get_rowstride()
+
+    image = Clutter.Image()
+    image.set_bytes(pixbuf.read_pixel_bytes(), pixel_format, width, height, stride)
+
+    stage.set_content_gravity(Clutter.ContentGravity.RESIZE_ASPECT)
+    stage.set_content_scaling_filters(Clutter.ScalingFilter.TRILINEAR,
+                                      Clutter.ScalingFilter.LINEAR)
+    stage.set_content(image)
+
+    label = 'Content Gravity: Resize Aspect'
+    text = Clutter.Text(text=label)
+    text.add_constraint(Clutter.AlignConstraint(source=stage, align_axis=Clutter.AlignAxis.BOTH, factor=0.5))
+    stage.add_child(text)
+
+    action = Clutter.TapAction()
+    action.connect('tap', on_tap, text)
+    stage.add_action(action)
+
+    Clutter.main()
diff --git a/examples/redhand.png b/examples/redhand.png
new file mode 100644
index 0000000..c07d8ac
Binary files /dev/null and b/examples/redhand.png differ