[cogl] Add test that Cogl doesn't crash when freeing unallocated texture

[Neil Roberts <nroberts src gnome org>]

commit bfada22d9a7f60baad5ae5615e45f10327e23e36
Author: Neil Roberts <neil linux intel com>
Date:   Tue Jun 11 15:57:37 2013 +0100

    Add test that Cogl doesn't crash when freeing unallocated texture
    
    It looks like Cogl doesn't currently clean up an unallocated atlas
    texture properly so if it fails to allocate it. It will then crash
    when it is freed. This adds a conformance test to verify that all of
    the various texture types can be freed without allocating them.
    
    Reviewed-by: Robert Bragg <robert linux intel com>

 tests/conform/Makefile.am                |    1 +
 tests/conform/test-conform-main.c        |    2 +
 tests/conform/test-texture-no-allocate.c |   85 ++++++++++++++++++++++++++++++
 3 files changed, 88 insertions(+), 0 deletions(-)
---
diff --git a/tests/conform/Makefile.am b/tests/conform/Makefile.am
index 46d58dc..33913c5 100644
--- a/tests/conform/Makefile.am
+++ b/tests/conform/Makefile.am
@@ -64,6 +64,7 @@ test_sources = \
        test-primitive-and-journal.c \
        test-copy-replace-texture.c \
        test-pipeline-cache-unrefs-texture.c \
+       test-texture-no-allocate.c \
        $(NULL)
 
 if !USING_EMSCRIPTEN
diff --git a/tests/conform/test-conform-main.c b/tests/conform/test-conform-main.c
index 78ce81f..4d86c08 100644
--- a/tests/conform/test-conform-main.c
+++ b/tests/conform/test-conform-main.c
@@ -143,6 +143,8 @@ main (int argc, char **argv)
 
   ADD_TEST (test_fence, TEST_REQUIREMENT_FENCE, 0);
 
+  ADD_TEST (test_texture_no_allocate, 0, TEST_KNOWN_FAILURE);
+
   g_printerr ("Unknown test name \"%s\"\n", argv[1]);
 
   return 1;
diff --git a/tests/conform/test-texture-no-allocate.c b/tests/conform/test-texture-no-allocate.c
new file mode 100644
index 0000000..56cca44
--- /dev/null
+++ b/tests/conform/test-texture-no-allocate.c
@@ -0,0 +1,85 @@
+#include <cogl/cogl.h>
+
+#include "test-utils.h"
+
+/* Tests that the various texture types can be freed without being
+ * allocated */
+
+/* Texture size that is probably to big to fit within the texture
+ * limits */
+#define BIG_TEX_WIDTH 16384
+#define BIG_TEX_HEIGHT 128
+
+void
+test_texture_no_allocate (void)
+{
+  uint8_t *tex_data;
+  CoglTexture *texture;
+  CoglTexture2D *texture_2d;
+  CoglError *error = NULL;
+
+  tex_data = g_malloc (BIG_TEX_WIDTH * BIG_TEX_HEIGHT * 4);
+
+  /* NB: if we make the atlas and sliced texture APIs public then this
+   * could changed to explicitly use that instead of the magic texture
+   * API */
+
+  /* Try to create an atlas texture that is too big so it will
+   * internally be freed without allocating */
+  texture = cogl_texture_new_from_data (test_ctx,
+                                        BIG_TEX_WIDTH,
+                                        BIG_TEX_HEIGHT,
+                                        COGL_TEXTURE_NONE, /* flags */
+                                        /* format */
+                                        COGL_PIXEL_FORMAT_RGBA_8888_PRE,
+                                        /* internal format */
+                                        COGL_PIXEL_FORMAT_ANY,
+                                        /* rowstride */
+                                        BIG_TEX_WIDTH * 4,
+                                        tex_data,
+                                        &error);
+
+  g_free (tex_data);
+
+  /* It's ok if this causes an error, we just don't want it to
+   * crash */
+
+  if (texture == NULL)
+    cogl_error_free (error);
+  else
+    cogl_object_unref (texture);
+
+  /* Try to create a sliced texture without allocating it */
+  texture = cogl_texture_new_with_size (test_ctx,
+                                        BIG_TEX_WIDTH,
+                                        BIG_TEX_HEIGHT,
+                                        COGL_TEXTURE_NO_ATLAS,
+                                        COGL_PIXEL_FORMAT_RGBA_8888_PRE);
+  cogl_object_unref (texture);
+
+  /* 2D texture */
+  texture_2d = cogl_texture_2d_new_with_size (test_ctx,
+                                              64, 64,
+                                              COGL_PIXEL_FORMAT_RGBA_8888_PRE);
+  cogl_object_unref (texture_2d);
+
+  /* 3D texture */
+  if (cogl_has_feature (test_ctx, COGL_FEATURE_ID_TEXTURE_3D))
+    {
+      CoglTexture3D *texture_3d =
+        cogl_texture_3d_new_with_size (test_ctx,
+                                       64, 64, 64,
+                                       COGL_PIXEL_FORMAT_RGBA_8888_PRE);
+      cogl_object_unref (texture_3d);
+    }
+
+  /* Rectangle texture */
+  if (cogl_has_feature (test_ctx, COGL_FEATURE_ID_TEXTURE_RECTANGLE))
+    {
+      CoglTextureRectangle *texture_rect =
+        cogl_texture_rectangle_new_with_size (test_ctx,
+                                              64, 64,
+                                              COGL_PIXEL_FORMAT_RGBA_8888_PRE);
+      cogl_object_unref (texture_rect);
+    }
+}