/* we replicate the process function from GeglOperationComposer to be * able to bail out earlier for some common processing time pitfalls */ static gboolean gegl_operation_composer_process2 (GeglOperation *operation, GeglOperationContext *context, const gchar *output_prop, const GeglRectangle *result) { GeglOperationComposerClass *klass = GEGL_OPERATION_COMPOSER_GET_CLASS (operation); GeglBuffer *input; GeglBuffer *aux; GeglBuffer *output; gboolean success = FALSE; if (strcmp (output_prop, "output")) { g_warning ("requested processing of %s pad on a composer", output_prop); return FALSE; } input = gegl_operation_context_get_source (context, "input"); aux = gegl_operation_context_get_source (context, "aux"); if (gegl_can_do_inplace_processing (operation, input, result)) { output = g_object_ref (input); gegl_operation_context_take_object (context, "output", G_OBJECT (output)); } else output = gegl_operation_context_get_target (context, "output"); { gboolean done = FALSE; if (result->width == 0 || result->height == 0) done = TRUE; success = done; if (!done) { success = klass->process (operation, input, aux, output, result); if (output == GEGL_BUFFER (operation->node->cache)) gegl_cache_computed (operation->node->cache, result); } if (input) g_object_unref (input); if (aux) g_object_unref (aux); } return success; }
static gboolean gegl_operation_composer_process (GeglOperation *operation, GeglOperationContext *context, const gchar *output_prop, const GeglRectangle *result, gint level) { GeglOperationComposerClass *klass = GEGL_OPERATION_COMPOSER_GET_CLASS (operation); GeglBuffer *input; GeglBuffer *aux; GeglBuffer *output; gboolean success = FALSE; if (strcmp (output_prop, "output")) { g_warning ("requested processing of %s pad on a composer", output_prop); return FALSE; } input = gegl_operation_context_get_source (context, "input"); aux = gegl_operation_context_get_source (context, "aux"); output = gegl_operation_context_get_target (context, "output"); /* A composer with a NULL aux, can still be valid, the * subclass has to handle it. */ if (input != NULL || aux != NULL) { success = klass->process (operation, input, aux, output, result, level); if (output == GEGL_BUFFER (operation->node->cache)) gegl_cache_computed (operation->node->cache, result); if (input) g_object_unref (input); if (aux) g_object_unref (aux); } else { g_warning ("%s received NULL input and aux", gegl_node_get_debug_name (operation->node)); } return success; }