Fix: File output uses incorrect resolution when first socket unused.

File output node always received the resolution from the first socket.
When that socket didn't had a link it would use a resolution of 0,0.
What lead to not saving the file at all.

This only effected Multi layer OpenEXR files.
This change would go over all the links to find the first valid
resolution.

1 files changed, 16 insertions, 2 deletions

diff --git a/source/blender/compositor/intern/COM_NodeOperation.cc b/source/blender/compositor/intern/COM_NodeOperation.cc
index 35e7f1adc7d..0bb8e0ef674 100644
--- a/source/blender/compositor/intern/COM_NodeOperation.cc
+++ b/source/blender/compositor/intern/COM_NodeOperation.cc
@@ -62,15 +62,29 @@ void NodeOperation::addOutputSocket(DataType datatype)
 void NodeOperation::determineResolution(unsigned int resolution[2],
                                         unsigned int preferredResolution[2])
 {
-  if (m_resolutionInputSocketIndex < m_inputs.size()) {
+  unsigned int used_resolution_index = 0;
+  if (m_resolutionInputSocketIndex == RESOLUTION_INPUT_ANY) {
+    for (NodeOperationInput &input : m_inputs) {
+      unsigned int any_resolution[2] = {0, 0};
+      input.determineResolution(any_resolution, preferredResolution);
+      if (any_resolution[0] * any_resolution[1] > 0) {
+        resolution[0] = any_resolution[0];
+        resolution[1] = any_resolution[1];
+        break;
+      }
+      used_resolution_index += 1;
+    }
+  }
+  else if (m_resolutionInputSocketIndex < m_inputs.size()) {
     NodeOperationInput &input = m_inputs[m_resolutionInputSocketIndex];
     input.determineResolution(resolution, preferredResolution);
+    used_resolution_index = m_resolutionInputSocketIndex;
   }
   unsigned int temp2[2] = {resolution[0], resolution[1]};
 
   unsigned int temp[2];
   for (unsigned int index = 0; index < m_inputs.size(); index++) {
-    if (index == this->m_resolutionInputSocketIndex) {
+    if (index == used_resolution_index) {
       continue;
     }
     NodeOperationInput &input = m_inputs[index];