mutter/tests/conform/test-cogl-readpixels.c

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#include <clutter/clutter.h>
#include <cogl/cogl.h>
#include "test-conform-common.h"
#define RED 0
#define GREEN 1
#define BLUE 2
#define DRAW_BUFFER_WIDTH 640
#define DRAW_BUFFER_HEIGHT 480
static const ClutterColor stage_color = { 0x0, 0x0, 0x0, 0xff };
static void
on_paint (ClutterActor *actor, void *state)
{
float saved_viewport[4];
CoglMatrix saved_projection;
CoglMatrix projection;
CoglMatrix modelview;
guchar *data;
CoglHandle tex;
CoglHandle offscreen;
guint32 *pixels;
/* Save the Clutter viewport/matrices and load identity matrices */
cogl_get_viewport (saved_viewport);
cogl_get_projection_matrix (&saved_projection);
cogl_push_matrix ();
cogl_matrix_init_identity (&projection);
cogl_matrix_init_identity (&modelview);
cogl_set_projection_matrix (&projection);
cogl_set_modelview_matrix (&modelview);
/* All offscreen rendering is done upside down so the first thing we
* verify is reading back grid of colors from a CoglOffscreen draw buffer
*/
data = g_malloc (DRAW_BUFFER_WIDTH * 4 * DRAW_BUFFER_HEIGHT);
tex = cogl_texture_new_from_data (DRAW_BUFFER_WIDTH, DRAW_BUFFER_HEIGHT,
COGL_TEXTURE_NO_SLICING,
COGL_PIXEL_FORMAT_RGBA_8888, /* data fmt */
COGL_PIXEL_FORMAT_ANY, /* internal fmt */
DRAW_BUFFER_WIDTH * 4, /* rowstride */
data);
g_free (data);
offscreen = cogl_offscreen_new_to_texture (tex);
cogl_push_draw_buffer ();
cogl_set_draw_buffer (0 /* unused */, offscreen);
/* red, top left */
cogl_set_source_color4ub (0xff, 0x00, 0x00, 0xff);
cogl_rectangle (-1, 1, 0, 0);
/* green, top right */
cogl_set_source_color4ub (0x00, 0xff, 0x00, 0xff);
cogl_rectangle (0, 1, 1, 0);
/* blue, bottom left */
cogl_set_source_color4ub (0x00, 0x00, 0xff, 0xff);
cogl_rectangle (-1, 0, 0, -1);
/* white, bottom right */
cogl_set_source_color4ub (0xff, 0xff, 0xff, 0xff);
cogl_rectangle (0, 0, 1, -1);
pixels = g_malloc0 (DRAW_BUFFER_WIDTH * 4 * DRAW_BUFFER_HEIGHT);
cogl_read_pixels (0, 0, DRAW_BUFFER_WIDTH, DRAW_BUFFER_HEIGHT,
COGL_READ_PIXELS_COLOR_BUFFER,
COGL_PIXEL_FORMAT_RGBA_8888,
(guchar *)pixels);
g_assert (pixels[0] == 0xff0000ff);
g_assert (pixels[DRAW_BUFFER_WIDTH - 1] == 0xff00ff00);
g_assert (pixels[(DRAW_BUFFER_HEIGHT - 1) * DRAW_BUFFER_WIDTH] == 0xffff0000);
g_assert (pixels[(DRAW_BUFFER_HEIGHT - 1) * DRAW_BUFFER_WIDTH +
DRAW_BUFFER_WIDTH - 1] == 0xffffffff);
g_free (pixels);
cogl_pop_draw_buffer ();
cogl_handle_unref (offscreen);
/* Now verify reading back from an onscreen draw buffer...
*/
cogl_set_source_texture (tex);
cogl_rectangle (-1, 1, 1, -1);
pixels = g_malloc0 (DRAW_BUFFER_WIDTH * 4 * DRAW_BUFFER_HEIGHT);
cogl_read_pixels (0, 0, DRAW_BUFFER_WIDTH, DRAW_BUFFER_HEIGHT,
COGL_READ_PIXELS_COLOR_BUFFER,
COGL_PIXEL_FORMAT_RGBA_8888,
(guchar *)pixels);
g_assert (pixels[0] == 0xff0000ff);
g_assert (pixels[DRAW_BUFFER_WIDTH - 1] == 0xff00ff00);
g_assert (pixels[(DRAW_BUFFER_HEIGHT - 1) * DRAW_BUFFER_WIDTH] == 0xffff0000);
g_assert (pixels[(DRAW_BUFFER_HEIGHT - 1) * DRAW_BUFFER_WIDTH +
DRAW_BUFFER_WIDTH - 1] == 0xffffffff);
g_free (pixels);
cogl_handle_unref (tex);
/* Comment this out if you want visual feedback of what this test
* paints.
*/
clutter_main_quit ();
}
static gboolean
queue_redraw (gpointer stage)
{
clutter_actor_queue_redraw (CLUTTER_ACTOR (stage));
return TRUE;
}
void
test_cogl_readpixels (TestConformSimpleFixture *fixture,
gconstpointer data)
{
guint idle_source;
ClutterActor *stage;
stage = clutter_stage_get_default ();
clutter_stage_set_color (CLUTTER_STAGE (stage), &stage_color);
clutter_actor_set_size (stage, DRAW_BUFFER_WIDTH, DRAW_BUFFER_HEIGHT);
/* We force continuous redrawing of the stage, since we need to skip
* the first few frames, and we wont be doing anything else that
* will trigger redrawing. */
idle_source = g_idle_add (queue_redraw, stage);
g_signal_connect_after (stage, "paint", G_CALLBACK (on_paint), NULL);
clutter_actor_show (stage);
clutter_main ();
g_source_remove (idle_source);
/* Remove all of the actors from the stage */
clutter_container_foreach (CLUTTER_CONTAINER (stage),
(ClutterCallback) clutter_actor_destroy,
NULL);
if (g_test_verbose ())
g_print ("OK\n");
}