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cogl-pipeline: Fix reference counting on promoting weak parents
When a copy is made of a weak pipeline it tries to promote the weak parent by taking a reference on that weak pipeline's parent. However promote_weak_ancestors was instead always taking a reference on the first parent, regardless of whether it was weak. The corresponding revert_weak_ancestors function which is supposed to undo the effect of promote_weak_ancestors only unref'd the parent if was weak. This meant that any non-weak pipeline copy would end up leaking a reference on its parent. This patch changes both functions to have a similar loop. It loops through all of the parents of the pipeline until it finds one that is not weak and refs or unrefs the *parent* of that pipeline instead of the pipeline itself. Signed-off-by: Robert Bragg <robert@linux.intel.com>
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@ -375,37 +375,40 @@ _cogl_pipeline_promote_weak_ancestors (CoglPipeline *strong)
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g_return_if_fail (!strong->is_weak);
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for (n = COGL_PIPELINE_NODE (strong)->parent; n; n = n->parent)
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{
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CoglPipeline *pipeline = COGL_PIPELINE (n);
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/* If the parent of strong is weak, then we want to promote it by
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taking a reference on strong's grandparent. We don't need to take
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a reference on strong's direct parent */
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cogl_object_ref (pipeline);
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if (COGL_PIPELINE_NODE (strong)->parent == NULL)
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return;
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if (!pipeline->is_weak)
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return;
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}
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for (n = COGL_PIPELINE_NODE (strong)->parent;
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/* We can assume that all weak pipelines have a parent */
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COGL_PIPELINE (n)->is_weak;
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n = n->parent)
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/* 'n' is weak so we take a reference on its parent */
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cogl_object_ref (n->parent);
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}
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static void
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_cogl_pipeline_revert_weak_ancestors (CoglPipeline *strong)
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{
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CoglPipeline *parent = _cogl_pipeline_get_parent (strong);
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CoglPipelineNode *n;
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g_return_if_fail (!strong->is_weak);
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if (!parent || !parent->is_weak)
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/* This reverts the effect of calling
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_cogl_pipeline_promote_weak_ancestors */
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if (COGL_PIPELINE_NODE (strong)->parent == NULL)
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return;
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for (n = COGL_PIPELINE_NODE (strong)->parent; n; n = n->parent)
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{
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CoglPipeline *pipeline = COGL_PIPELINE (n);
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cogl_object_unref (pipeline);
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if (!pipeline->is_weak)
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return;
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}
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for (n = COGL_PIPELINE_NODE (strong)->parent;
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/* We can assume that all weak pipelines have a parent */
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COGL_PIPELINE (n)->is_weak;
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n = n->parent)
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/* 'n' is weak so we unref its parent */
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cogl_object_unref (n->parent);
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}
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/* XXX: Always have an eye out for opportunities to lower the cost of
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