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mutter/tests/conform/texture.c

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[texture] Support picking textures according to their alpha channel This adds a boolean "pick-with-alpha" property to ClutterTexture and when true, it will use the textures alpha channel to define the actors shape when picking. Users should be aware that it's a bit more expensive to pick textures like this (so probably best not to blindly enable it on *all* your textures) since it implies rasterizing the texture during picking whereas we would otherwise just send a solid filled quad to the GPU. It will also interrupt the internal batching of geometry for pick renders which can otherwise often be done in a single draw call.
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#include <glib.h>
#include <clutter/clutter.h>
#include <string.h>
#include "test-conform-common.h"
static CoglHandle
make_texture (void)
{
guint32 *data = g_malloc (100 * 100 * 4);
int x;
int y;
for (y = 0; y < 100; y ++)
for (x = 0; x < 100; x++)
{
if (x < 50 && y < 50)
data[y * 100 + x] = 0xff00ff00;
else
data[y * 100 + x] = 0xff00ffff;
}
return cogl_texture_new_from_data (100,
100,
COGL_TEXTURE_NONE,
COGL_PIXEL_FORMAT_ARGB_8888,
COGL_PIXEL_FORMAT_ARGB_8888,
400,
(guchar *)data);
}
void
conform: Clean up test names Drop the 'test-' prefix: it's the conformance test suite, we know it's full of tests.
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texture_pick_with_alpha (TestConformSimpleFixture *fixture,
gconstpointer data)
[texture] Support picking textures according to their alpha channel This adds a boolean "pick-with-alpha" property to ClutterTexture and when true, it will use the textures alpha channel to define the actors shape when picking. Users should be aware that it's a bit more expensive to pick textures like this (so probably best not to blindly enable it on *all* your textures) since it implies rasterizing the texture during picking whereas we would otherwise just send a solid filled quad to the GPU. It will also interrupt the internal batching of geometry for pick renders which can otherwise often be done in a single draw call.
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{
ClutterTexture *tex = CLUTTER_TEXTURE (clutter_texture_new ());
conform/*: Do not use clutter_stage_get_default() Use the correct stage creation/destruction API.
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ClutterStage *stage = CLUTTER_STAGE (clutter_stage_new ());
[texture] Support picking textures according to their alpha channel This adds a boolean "pick-with-alpha" property to ClutterTexture and when true, it will use the textures alpha channel to define the actors shape when picking. Users should be aware that it's a bit more expensive to pick textures like this (so probably best not to blindly enable it on *all* your textures) since it implies rasterizing the texture during picking whereas we would otherwise just send a solid filled quad to the GPU. It will also interrupt the internal batching of geometry for pick renders which can otherwise often be done in a single draw call.
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ClutterActor *actor;
clutter_texture_set_cogl_texture (tex, make_texture ());
clutter_container_add_actor (CLUTTER_CONTAINER (stage), CLUTTER_ACTOR (tex));
clutter_actor_show (CLUTTER_ACTOR (stage));
if (g_test_verbose ())
{
g_print ("\nstage = %p\n", stage);
g_print ("texture = %p\n\n", tex);
}
clutter_texture_set_pick_with_alpha (tex, TRUE);
if (g_test_verbose ())
g_print ("Testing with pick-with-alpha enabled:\n");
/* This should fall through and hit the stage: */
actor = clutter_stage_get_actor_at_pos (stage, CLUTTER_PICK_ALL, 10, 10);
if (g_test_verbose ())
g_print ("actor @ (10, 10) = %p\n", actor);
g_assert (actor == CLUTTER_ACTOR (stage));
/* The rest should hit the texture */
actor = clutter_stage_get_actor_at_pos (stage, CLUTTER_PICK_ALL, 90, 10);
if (g_test_verbose ())
g_print ("actor @ (90, 10) = %p\n", actor);
g_assert (actor == CLUTTER_ACTOR (tex));
actor = clutter_stage_get_actor_at_pos (stage, CLUTTER_PICK_ALL, 90, 90);
if (g_test_verbose ())
g_print ("actor @ (90, 90) = %p\n", actor);
g_assert (actor == CLUTTER_ACTOR (tex));
actor = clutter_stage_get_actor_at_pos (stage, CLUTTER_PICK_ALL, 10, 90);
if (g_test_verbose ())
g_print ("actor @ (10, 90) = %p\n", actor);
g_assert (actor == CLUTTER_ACTOR (tex));
clutter_texture_set_pick_with_alpha (tex, FALSE);
if (g_test_verbose ())
g_print ("Testing with pick-with-alpha disabled:\n");
actor = clutter_stage_get_actor_at_pos (stage, CLUTTER_PICK_ALL, 10, 10);
if (g_test_verbose ())
g_print ("actor @ (10, 10) = %p\n", actor);
g_assert (actor == CLUTTER_ACTOR (tex));
conform/*: Do not use clutter_stage_get_default() Use the correct stage creation/destruction API.
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clutter_actor_destroy (CLUTTER_ACTOR (stage));
[texture] Support picking textures according to their alpha channel This adds a boolean "pick-with-alpha" property to ClutterTexture and when true, it will use the textures alpha channel to define the actors shape when picking. Users should be aware that it's a bit more expensive to pick textures like this (so probably best not to blindly enable it on *all* your textures) since it implies rasterizing the texture during picking whereas we would otherwise just send a solid filled quad to the GPU. It will also interrupt the internal batching of geometry for pick renders which can otherwise often be done in a single draw call.
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if (g_test_verbose ())
g_print ("OK\n");
}
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