From eb54b67caa9f48fcbaf58dd2f71774bb4b9e66c9 Mon Sep 17 00:00:00 2001
From: Bruno <bruno.herbelin@gmail.com>
Date: Thu, 22 Apr 2021 23:38:00 +0200
Subject: [PATCH] New function to get thumbnail of render view

---
 RenderView.cpp | 22 ++++++++++++++++++++++
 RenderView.h   |  2 ++
 defines.h      |  1 +
 3 files changed, 25 insertions(+)

diff --git a/RenderView.cpp b/RenderView.cpp
index 19428c1..631549e 100644
--- a/RenderView.cpp
+++ b/RenderView.cpp
@@ -82,3 +82,25 @@ void RenderView::draw()
         frame_buffer_->end();
     }
 }
+
+
+FrameBufferImage *RenderView::thumbnail () const
+{
+    FrameBufferImage *thumbnail = nullptr;
+
+    if (frame_buffer_) {
+        FrameBufferSurface *thumb = new FrameBufferSurface(frame_buffer_);
+        FrameBuffer *frame_thumbnail = new FrameBuffer( glm::vec3(SESSION_THUMBNAIL_HEIGHT * frame_buffer_->aspectRatio(), SESSION_THUMBNAIL_HEIGHT, 1.f) );
+
+        frame_thumbnail->begin();
+        thumb->draw(glm::identity<glm::mat4>(), frame_thumbnail->projection());
+        frame_thumbnail->end();
+
+        thumbnail = frame_thumbnail->image();
+
+        delete thumb;
+        delete frame_thumbnail;
+    }
+
+    return thumbnail;
+}
diff --git a/RenderView.h b/RenderView.h
index 987a9a7..d235482 100644
--- a/RenderView.h
+++ b/RenderView.h
@@ -22,6 +22,8 @@ public:
     float fading() const;
 
     inline FrameBuffer *frame () const { return frame_buffer_; }
+
+    FrameBufferImage *thumbnail () const;
 };
 
 #endif // RENDERVIEW_H
diff --git a/defines.h b/defines.h
index 0ca07d0..46db170 100644
--- a/defines.h
+++ b/defines.h
@@ -59,6 +59,7 @@
 #define TRANSITION_MIN_DURATION 0.2f
 #define TRANSITION_MAX_DURATION 10.f
 #define ARROWS_MOVEMENT_FACTOR 4.f
+#define SESSION_THUMBNAIL_HEIGHT 120.f
 
 #define IMGUI_TITLE_MAINWINDOW ICON_FA_CIRCLE_NOTCH "  vimix"
 #define IMGUI_TITLE_MEDIAPLAYER ICON_FA_FILM "  Player"