cogl/texture: Type check introspected calls

CoglTexture can be used by e.g. Javascript, and the convention is to be
more forgiving regarding passed input so that invalid Javascript calls
doesn't cause actual SIGSEGV/SIGABRT. As elsewhere, do this by
sprinkeling g_return(_val)_if_fail() on introspected functions.

Related: https://bugzilla.redhat.com/show_bug.cgi?id=2124322
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2616>

cogl/cogl/cogl-texture.c

@@ -197,12 +197,16 @@ cogl_texture_is_get_data_supported (CoglTexture *texture)
 unsigned int
 cogl_texture_get_width (CoglTexture *texture)
 {
+  g_return_val_if_fail (cogl_is_texture (texture), 0);
+
   return texture->width;
 }
 
 unsigned int
 cogl_texture_get_height (CoglTexture *texture)
 {
+  g_return_val_if_fail (cogl_is_texture (texture), 0);
+
   return texture->height;
 }
 
@@ -217,6 +221,8 @@ _cogl_texture_get_format (CoglTexture *texture)
 int
 cogl_texture_get_max_waste (CoglTexture *texture)
 {
+  g_return_val_if_fail (cogl_is_texture (texture), 0);
+
   return texture->vtable->get_max_waste (texture);
 }
 
@@ -272,6 +278,8 @@ _cogl_texture_get_level_size (CoglTexture *texture,
 gboolean
 cogl_texture_is_sliced (CoglTexture *texture)
 {
+  g_return_val_if_fail (cogl_is_texture (texture), FALSE);
+
   if (!texture->allocated)
     cogl_texture_allocate (texture, NULL);
   return texture->vtable->is_sliced (texture);
@@ -312,6 +320,8 @@ cogl_texture_get_gl_texture (CoglTexture *texture,
 			     GLuint *out_gl_handle,
 			     GLenum *out_gl_target)
 {
+  g_return_val_if_fail (cogl_is_texture (texture), FALSE);
+
   if (!texture->allocated)
     cogl_texture_allocate (texture, NULL);
 
@@ -393,8 +403,11 @@ cogl_texture_set_region_from_bitmap (CoglTexture *texture,
                                      CoglBitmap *bitmap)
 {
   GError *ignore_error = NULL;
-  gboolean status =
-    _cogl_texture_set_region_from_bitmap (texture,
+  gboolean status;
+
+  g_return_val_if_fail (cogl_is_texture (texture), FALSE);
+
+  status = _cogl_texture_set_region_from_bitmap (texture,
                                                  src_x, src_y,
                                                  dst_width, dst_height,
                                                  bitmap,
@@ -468,6 +481,7 @@ cogl_texture_set_region (CoglTexture *texture,
   int bytes_per_pixel;
   gboolean status;
 
+  g_return_val_if_fail (cogl_is_texture (texture), FALSE);
   g_return_val_if_fail (format != COGL_PIXEL_FORMAT_ANY, FALSE);
   g_return_val_if_fail (cogl_pixel_format_get_n_planes (format) == 1, FALSE);
 
@@ -503,6 +517,8 @@ cogl_texture_set_data (CoglTexture *texture,
   int level_width;
   int level_height;
 
+  g_return_val_if_fail (cogl_is_texture (texture), FALSE);
+
   _cogl_texture_get_level_size (texture,
                                 level,
                                 &level_width,
@@ -723,7 +739,7 @@ cogl_texture_get_data (CoglTexture *texture,
 		       unsigned int rowstride,
 		       uint8_t *data)
 {
-  CoglContext *ctx = texture->context;
+  CoglContext *ctx;
   int bpp;
   int byte_size;
   CoglPixelFormat closest_format;
@@ -734,9 +750,10 @@ cogl_texture_get_data (CoglTexture *texture,
   int tex_height;
   CoglPixelFormat texture_format;
   GError *ignore_error = NULL;
-
   CoglTextureGetData tg_data;
 
+  g_return_val_if_fail (cogl_is_texture (texture), 0);
+
   texture_format = _cogl_texture_get_format (texture);
 
   /* Default to internal format if none specified */
@@ -759,6 +776,7 @@ cogl_texture_get_data (CoglTexture *texture,
   if (data == NULL)
     return byte_size;
 
+  ctx = texture->context;
   closest_format =
     ctx->texture_driver->find_best_gl_get_data_format (ctx,
                                                        format,
@@ -1063,6 +1081,8 @@ gboolean
 cogl_texture_allocate (CoglTexture *texture,
                        GError **error)
 {
+  g_return_val_if_fail (cogl_is_texture (texture), FALSE);
+
   if (texture->allocated)
     return TRUE;
 
@@ -1176,6 +1196,7 @@ void
 cogl_texture_set_components (CoglTexture *texture,
                              CoglTextureComponents components)
 {
+  g_return_if_fail (cogl_is_texture (texture));
   g_return_if_fail (!texture->allocated);
 
   if (texture->components == components)
@@ -1187,6 +1208,8 @@ cogl_texture_set_components (CoglTexture *texture,
 CoglTextureComponents
 cogl_texture_get_components (CoglTexture *texture)
 {
+  g_return_val_if_fail (cogl_is_texture (texture), 0);
+
   return texture->components;
 }
 
@@ -1194,6 +1217,7 @@ void
 cogl_texture_set_premultiplied (CoglTexture *texture,
                                 gboolean premultiplied)
 {
+  g_return_if_fail (cogl_is_texture (texture));
   g_return_if_fail (!texture->allocated);
 
   premultiplied = !!premultiplied;
@@ -1207,6 +1231,8 @@ cogl_texture_set_premultiplied (CoglTexture *texture,
 gboolean
 cogl_texture_get_premultiplied (CoglTexture *texture)
 {
+  g_return_val_if_fail (cogl_is_texture (texture), FALSE);
+
   return texture->premultiplied;
 }