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cookbook: Fix the text-shadow recipe

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Fill out the recipe and add more comments to the example code.
This commit is contained in:
Emmanuele Bassi
2010-08-05 11:41:25 +01:00
parent ea3af7bf33
commit 8668a019a0
2 changed files with 78 additions and 3 deletions
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10
doc/cookbook/examples/text-shadow.c
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@ -11,22 +11,26 @@ _text_paint_cb (ClutterActor *actor)
{
ClutterText *text = CLUTTER_TEXT (actor);
ClutterActorBox alloc = { 0, };
clutter_actor_get_allocation_box (actor, &alloc);
/* Get the PangoLayout that the Text actor is going to paint */
PangoLayout *layout;
layout = clutter_text_get_layout (text);
/* Get the color of the text, to extract the alpha component */
ClutterColor text_color = { 0, };
clutter_text_get_color (text, &text_color);
/* Composite the opacity so that the shadow is correctly blended */
guint8 real_opacity;
real_opacity = clutter_actor_get_paint_opacity (actor)
* text_color.alpha
/ 255;
/* Create a #ccc color and premultiply it */
CoglColor color;
cogl_color_set_from_4ub (&color, 0xcc, 0xcc, 0xcc, real_opacity);
cogl_color_premultiply (&color);
/* Finally, render the Text layout at a given offset using the color */
cogl_pango_render_layout (layout, SHADOW_X_OFFSET, SHADOW_Y_OFFSET, &color, 0);
}