aece642adb
Make sure users get the idea that clutter_init()
has a return value that needs to be checked.
These were fixed via sed magic:
sed -i -s -e "s/clutter_init (.*)/\
if (& != CLUTTER_INIT_SUCCESS)\n return 1/"\
doc/*/*/*.{c,xml} doc/*/*.xml
http://bugzilla.clutter-project.org/show_bug.cgi?id=2574
62 lines
2.2 KiB
C
62 lines
2.2 KiB
C
#include <clutter/clutter.h>
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int
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main (int argc, char **argv)
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{
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ClutterActor *stage, *image, *sub_image;
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CoglHandle texture, sub_texture;
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gfloat image_width, image_height;
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/* Initialize Clutter */
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if (clutter_init (NULL, NULL) != CLUTTER_INIT_SUCCESS)
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return 1;
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/* Get the default stage */
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stage = clutter_stage_get_default ();
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clutter_stage_set_title (CLUTTER_STAGE (stage), "Sub-texture");
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/* Create a new ClutterTexture that shows smiley.png */
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image = clutter_texture_new_from_file ("smiley.png", NULL);
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clutter_actor_get_size (image, &image_width, &image_height);
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clutter_actor_set_size (stage,
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image_width * 3 / 2 + 30,
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image_height + 20);
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/* Grab the CoglHandle of the underlying Cogl texture */
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texture = clutter_texture_get_cogl_texture (CLUTTER_TEXTURE (image));
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/* Create a new Cogl texture from the handle above. That new texture is a
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* rectangular region from image, more precisely the north ouest corner
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* of the image */
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sub_texture = cogl_texture_new_from_sub_texture (texture,
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0, 0,
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image_width / 2,
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image_height / 2);
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/* Finally, use the newly created Cogl texture to feed a new ClutterTexture
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* and thus create a new actor that displays sub_texture */
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sub_image = clutter_texture_new ();
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clutter_texture_set_cogl_texture (CLUTTER_TEXTURE (sub_image), sub_texture);
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/*
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* You could have used the more straightforward g_object_new() function that
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* can create an object and set some properties on it at the same time:
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* sub_image = g_object_new (CLUTTER_TYPE_TEXTURE,
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* "cogl-texture", sub_texture,
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* NULL);
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*/
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/* Put the original image at (10,10) and the new sub image next to it */
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clutter_actor_set_position (image, 10, 10);
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clutter_actor_set_position (sub_image, 20 + image_width, 10);
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/* Add both ClutterTexture to the stage */
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clutter_container_add (CLUTTER_CONTAINER (stage), image, sub_image, NULL);
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clutter_actor_show_all (stage);
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clutter_main ();
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return 0;
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}
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