mutter/tests/conform/test-cogl-texture-get-set-data.c
Neil Roberts 1fdd82fcf1 test-cogl-texture-get-set-data: Test the alpha component
Previously the alpha component of the test texture data was always set
to 255 and the data was read back as RGB so that the alpha component
is ignored. Now the alpha component is set to a generated value and
the data is read back a second time as RGBA to verify that Cogl is not
doing any premult conversions when the internal texture and target
data is the same.

http://bugzilla.clutter-project.org/show_bug.cgi?id=2414
2010-11-24 15:56:35 +00:00

167 lines
4.8 KiB
C

#include <clutter/clutter.h>
#include <glib.h>
#include <string.h>
#include "test-conform-common.h"
static void
check_texture (int width, int height, CoglTextureFlags flags)
{
CoglHandle tex;
guint8 *data, *p;
int y, x;
p = data = g_malloc (width * height * 4);
for (y = 0; y < height; y++)
for (x = 0; x < width; x++)
{
*(p++) = x;
*(p++) = y;
*(p++) = 128;
*(p++) = (x ^ y);
}
tex = cogl_texture_new_from_data (width, height,
flags,
COGL_PIXEL_FORMAT_RGBA_8888,
COGL_PIXEL_FORMAT_RGBA_8888,
width * 4,
data);
/* Replace the bottom right quarter of the data with negated data to
test set_region */
p = data + (height + 1) * width * 2;
for (y = 0; y < height / 2; y++)
{
for (x = 0; x < width / 2; x++)
{
p[0] = ~p[0];
p[1] = ~p[1];
p[2] = ~p[2];
p[3] = ~p[3];
p += 4;
}
p += width * 2;
}
cogl_texture_set_region (tex,
width / 2, /* src_x */
height / 2, /* src_y */
width / 2, /* dst_x */
height / 2, /* dst_y */
width / 2, /* dst_width */
height / 2, /* dst_height */
width,
height,
COGL_PIXEL_FORMAT_RGBA_8888,
width * 4, /* rowstride */
data);
/* Check passing a NULL pointer and a zero rowstride. The texture
should calculate the needed data size and return it */
g_assert_cmpint (cogl_texture_get_data (tex, COGL_PIXEL_FORMAT_ANY, 0, NULL),
==,
width * height * 4);
/* Try first receiving the data as RGB. This should cause a
* conversion */
memset (data, 0, width * height * 4);
cogl_texture_get_data (tex, COGL_PIXEL_FORMAT_RGB_888,
width * 3, data);
p = data;
for (y = 0; y < height; y++)
for (x = 0; x < width; x++)
{
if (x >= width / 2 && y >= height / 2)
{
g_assert_cmpint (p[0], ==, ~x & 0xff);
g_assert_cmpint (p[1], ==, ~y & 0xff);
g_assert_cmpint (p[2], ==, ~128 & 0xff);
}
else
{
g_assert_cmpint (p[0], ==, x & 0xff);
g_assert_cmpint (p[1], ==, y & 0xff);
g_assert_cmpint (p[2], ==, 128);
}
p += 3;
}
/* Now try receiving the data as RGBA. This should not cause a
* conversion and no unpremultiplication because we explicitly set
* the internal format when we created the texture */
memset (data, 0, width * height * 4);
cogl_texture_get_data (tex, COGL_PIXEL_FORMAT_RGBA_8888,
width * 4, data);
p = data;
for (y = 0; y < height; y++)
for (x = 0; x < width; x++)
{
if (x >= width / 2 && y >= height / 2)
{
g_assert_cmpint (p[0], ==, ~x & 0xff);
g_assert_cmpint (p[1], ==, ~y & 0xff);
g_assert_cmpint (p[2], ==, ~128 & 0xff);
g_assert_cmpint (p[3], ==, ~(x ^ y) & 0xff);
}
else
{
g_assert_cmpint (p[0], ==, x & 0xff);
g_assert_cmpint (p[1], ==, y & 0xff);
g_assert_cmpint (p[2], ==, 128);
g_assert_cmpint (p[3], ==, (x ^ y) & 0xff);
}
p += 4;
}
cogl_handle_unref (tex);
g_free (data);
}
static void
paint_cb (void)
{
/* First try without atlasing */
check_texture (256, 256, COGL_TEXTURE_NO_ATLAS);
/* Try again with atlasing. This should end up testing the atlas
backend and the sub texture backend */
check_texture (256, 256, 0);
/* Try with a really big texture in the hope that it will end up
sliced. */
check_texture (4, 5128, COGL_TEXTURE_NO_ATLAS);
/* And in the other direction. */
check_texture (5128, 4, COGL_TEXTURE_NO_ATLAS);
clutter_main_quit ();
}
void
test_cogl_texture_get_set_data (TestConformSimpleFixture *fixture,
gconstpointer data)
{
ClutterActor *stage;
guint paint_handler;
/* We create a stage even though we don't usually need it so that if
the draw-and-read texture fallback is needed then it will have
something to draw to */
stage = clutter_stage_get_default ();
paint_handler = g_signal_connect_after (stage, "paint",
G_CALLBACK (paint_cb), NULL);
clutter_actor_show (stage);
clutter_main ();
g_signal_handler_disconnect (stage, paint_handler);
if (g_test_verbose ())
g_print ("OK\n");
}