void ExportFrameToExr()

in unity/Assets/PostProcessingV2/Editor/PostProcessLayerEditor.cs [336:400]
47 lines of code
6 McCabe index (conditional complexity)

        void ExportFrameToExr(ExportMode mode)
        {
            string path = EditorUtility.SaveFilePanel("Export EXR...", "", "Frame", "exr");

            if (string.IsNullOrEmpty(path))
                return;

            EditorUtility.DisplayProgressBar("Export EXR", "Rendering...", 0f);

            var camera = m_Target.GetComponent<Camera>();
            var w = camera.pixelWidth;
            var h = camera.pixelHeight;

            var texOut = new Texture2D(w, h, TextureFormat.RGBAFloat, false, true);
            var target = RenderTexture.GetTemporary(w, h, 24, RenderTextureFormat.ARGBFloat, RenderTextureReadWrite.Linear);

            var lastActive = RenderTexture.active;
            var lastTargetSet = camera.targetTexture;
            var lastPostFXState = m_Target.enabled;
            var lastBreakColorGradingState = m_Target.breakBeforeColorGrading;

            if (mode == ExportMode.DisablePost)
                m_Target.enabled = false;
            else if (mode == ExportMode.BreakBeforeColorGradingLinear || mode == ExportMode.BreakBeforeColorGradingLog)
                m_Target.breakBeforeColorGrading = true;

            camera.targetTexture = target;
            camera.Render();
            camera.targetTexture = lastTargetSet;

            EditorUtility.DisplayProgressBar("Export EXR", "Reading...", 0.25f);

            m_Target.enabled = lastPostFXState;
            m_Target.breakBeforeColorGrading = lastBreakColorGradingState;

            if (mode == ExportMode.BreakBeforeColorGradingLog)
            {
                // Convert to log
                var material = new Material(Shader.Find("Hidden/PostProcessing/Editor/ConvertToLog"));
                var newTarget = RenderTexture.GetTemporary(w, h, 0, RenderTextureFormat.ARGBFloat, RenderTextureReadWrite.Linear);
                Graphics.Blit(target, newTarget, material, 0);
                RenderTexture.ReleaseTemporary(target);
                DestroyImmediate(material);
                target = newTarget;
            }

            RenderTexture.active = target;
            texOut.ReadPixels(new Rect(0, 0, w, h), 0, 0);
            texOut.Apply();
            RenderTexture.active = lastActive;

            EditorUtility.DisplayProgressBar("Export EXR", "Encoding...", 0.5f);

            var bytes = texOut.EncodeToEXR(EXRFlags.OutputAsFloat | EXRFlags.CompressZIP);

            EditorUtility.DisplayProgressBar("Export EXR", "Saving...", 0.75f);

            File.WriteAllBytes(path, bytes);

            EditorUtility.ClearProgressBar();
            AssetDatabase.Refresh();

            RenderTexture.ReleaseTemporary(target);
            DestroyImmediate(texOut);
        }