Fix some issues with the case where we need to expand gamma to linear, but not compre...
authorSteinar H. Gunderson <sgunderson@bigfoot.com>
Fri, 12 Oct 2012 17:45:37 +0000 (19:45 +0200)
committerSteinar H. Gunderson <sgunderson@bigfoot.com>
Fri, 12 Oct 2012 17:45:37 +0000 (19:45 +0200)
effect_chain.cpp

index b8361fe..b5d136b 100644 (file)
@@ -707,6 +707,21 @@ bool EffectChain::node_needs_gamma_fix(Node *node)
        if (node->disabled) {
                return false;
        }
+
+       // Small hack since the output is not an explicit node:
+       // If we are the last node and our output is in the wrong
+       // space compared to EffectChain's output, we need to fix it.
+       // This will only take us to linear, but fix_output_gamma()
+       // will come and take us to the desired output gamma
+       // if it is needed.
+       //
+       // This needs to be before everything else, since it could
+       // even apply to inputs (if they are the only effect).
+       if (node->outgoing_links.empty() &&
+           node->output_gamma_curve != output_format.gamma_curve) {
+               return true;
+       }
+
        if (node->effect->num_inputs() == 0) {
                return false;
        }
@@ -721,6 +736,7 @@ bool EffectChain::node_needs_gamma_fix(Node *node)
                assert(node->incoming_links.size() == 1);
                return node->incoming_links[0]->output_gamma_curve != GAMMA_LINEAR;
        }
+
        return (node->effect->needs_linear_light() && node->output_gamma_curve != GAMMA_LINEAR);
 }
 
@@ -788,8 +804,21 @@ void EffectChain::fix_internal_gamma_by_inserting_nodes(unsigned step)
                                continue;
                        }
 
-                       // Go through each input that is not linear gamma, and insert
-                       // a gamma conversion before it.
+                       // Special case: We could be an input and still be asked to
+                       // fix our gamma; if so, we should be the only node
+                       // (as node_needs_gamma_fix() would only return true in
+                       // for an input in that case). That means we should insert
+                       // a conversion node _after_ ourselves.
+                       if (node->incoming_links.empty()) {
+                               assert(node->outgoing_links.empty());
+                               Node *conversion = add_node(new GammaExpansionEffect());
+                               conversion->effect->set_int("source_curve", node->output_gamma_curve);
+                               conversion->output_gamma_curve = GAMMA_LINEAR;
+                               connect_nodes(node, conversion);
+                       }
+
+                       // If not, go through each input that is not linear gamma,
+                       // and insert a gamma conversion before it.
                        for (unsigned j = 0; j < node->incoming_links.size(); ++j) {
                                Node *input = node->incoming_links[j];
                                assert(input->output_gamma_curve != GAMMA_INVALID);