tests/cogl: Migrate texture get/set data test

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2555>

src/tests/cogl/conform/meson.build

@@ -30,6 +30,7 @@ cogl_tests = [
   [ 'test-map-buffer-range', [] ],
   [ 'test-npot-texture', [] ],
   [ 'test-alpha-textures', [] ],
+  [ 'test-texture-get-set-data', [] ],
 ]
 
 cogl_test_conformance_includes = [

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

@@ -0,0 +1,148 @@
+#include <cogl/cogl.h>
+
+#include <string.h>
+
+#include "tests/cogl-test-utils.h"
+
+static void
+check_texture (int width, int height, TestUtilsTextureFlags flags)
+{
+  CoglTexture *tex;
+  uint8_t *data, *p;
+  int y, x;
+  int rowstride;
+  CoglBitmap *bmp;
+
+  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);
+      }
+
+  bmp = cogl_bitmap_new_for_data (test_ctx,
+                                  width, height,
+                                  COGL_PIXEL_FORMAT_RGBA_8888,
+                                  width * 4,
+                                  data);
+
+  tex = test_utils_texture_new_from_bitmap (bmp, flags,
+                                            FALSE);
+
+  /* Replace the bottom right quarter of the data with negated data to
+     test set_region */
+  rowstride = width * 4;
+  p = data + (height / 2) * rowstride + rowstride / 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,
+                           height / 2,
+                           width / 2, /* dest x */
+                           height / 2, /* dest y */
+                           width / 2, /* region width */
+                           height / 2, /* region height */
+                           width, /* src width */
+                           height, /* src height */
+                           COGL_PIXEL_FORMAT_RGBA_8888,
+                           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_object_unref (tex);
+  g_free (data);
+}
+
+static void
+test_texture_get_set_data (void)
+{
+  /* First try without atlasing */
+  check_texture (256, 256, TEST_UTILS_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, TEST_UTILS_TEXTURE_NO_ATLAS);
+  /* And in the other direction. */
+  check_texture (5128, 4, TEST_UTILS_TEXTURE_NO_ATLAS);
+}
+
+COGL_TEST_SUITE (
+  g_test_add_func ("/texture/get-set-data", test_texture_get_set_data);
+)