Add a conformance test for cogl_texture_{get_data,set_region}

This verifies that calling cogl_texture_get_data returns the same data
uploaded to the texture. The bottom quarter of the texture is replaced
using cogl_texture_set_region. It tries creating the texture with
different sizes and flags in the hope that it will hit different
texture backends.

tests/conform/Makefile.am

@@ -28,6 +28,7 @@ test_conformance_SOURCES = 		\
 	test-cogl-texture-mipmaps.c     \
 	test-cogl-texture-rectangle.c   \
 	test-cogl-texture-pixmap-x11.c  \
+	test-cogl-texture-get-set-data.c \
 	test-cogl-wrap-modes.c          \
 	test-cogl-pixel-buffer.c	\
 	test-cogl-path.c		\

tests/conform/test-cogl-texture-get-set-data.c

@@ -0,0 +1,131 @@
+#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++) = 255;
+      }
+
+  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 += 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);
+
+  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);
+
+  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;
+      }
+
+  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);
+
+  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");
+}

tests/conform/test-conform-main.c

@@ -208,6 +208,7 @@ main (int argc, char **argv)
   TEST_CONFORM_SIMPLE ("/cogl/texture", test_cogl_texture_rectangle);
   TEST_CONFORM_SIMPLE ("/cogl/texture", test_cogl_wrap_modes);
   TEST_CONFORM_SIMPLE ("/cogl/texture", test_cogl_texture_pixmap_x11);
+  TEST_CONFORM_SIMPLE ("/cogl/texture", test_cogl_texture_get_set_data);
 
   TEST_CONFORM_SIMPLE ("/cogl/vertex-buffer", test_cogl_vertex_buffer_contiguous);
   TEST_CONFORM_SIMPLE ("/cogl/vertex-buffer", test_cogl_vertex_buffer_interleved);