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test-cogl-texture-get-set-data: Test the alpha component

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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
This commit is contained in:
Neil Roberts 2010-11-17 17:31:23 +00:00
parent 8b4034cd06
commit 1fdd82fcf1
1 changed files with 36 additions and 3 deletions
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39
tests/conform/test-cogl-texture-get-set-data.c
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@ -18,7 +18,7 @@ check_texture (int width, int height, CoglTextureFlags flags)
*(p++) = x;
*(p++) = y;
*(p++) = 128;
*(p++) = 255;
*(p++) = (x ^ y);
}
tex = cogl_texture_new_from_data (width, height,
@ -38,6 +38,7 @@ check_texture (int width, int height, CoglTextureFlags flags)
p[0] = ~p[0];
p[1] = ~p[1];
p[2] = ~p[2];
p[3] = ~p[3];
p += 4;
}
p += width * 2;
@ -55,14 +56,16 @@ check_texture (int width, int height, CoglTextureFlags flags)
width * 4, /* rowstride */
data);
memset (data, 0, width * height * 4);
/* 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);
@ -86,6 +89,36 @@ check_texture (int width, int height, CoglTextureFlags flags)
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);
}