From 1bc5ce3e07b46ec1d0f46dfe6e3443dccd11fa5e Mon Sep 17 00:00:00 2001
From: dec05eba <dec05eba@protonmail.com>
Date: Sat, 15 May 2021 02:17:46 +0200
Subject: Write images to file immediately to not kill ram

---
 src/main.cpp | 39 +++++++++++++++++++++++++++++++++------
 1 file changed, 33 insertions(+), 6 deletions(-)

diff --git a/src/main.cpp b/src/main.cpp
index 5876efc..5f31427 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -1,4 +1,7 @@
 #include <SFML/Graphics.hpp>
+#include <thread>
+#include <mutex>
+#include <deque>
 
 int main() {
     sf::Texture texture;
@@ -32,9 +35,33 @@ int main() {
     int flag_width = texture.getSize().x*0.6;
     int flag_height = texture.getSize().y*0.6;
 
+    system("rm -rf frames/*; mkdir frames");
+
+    std::deque<sf::Image> pending_frames;
+    std::mutex images_lock;
+
+    bool running = true;
+    std::thread work_thread([&images_lock, &running, &pending_frames]() mutable {
+        size_t frame_index = 0;
+        while(true) {
+            images_lock.lock();
+            if(!pending_frames.empty()) {
+                sf::Image image = std::move(pending_frames.front());
+                pending_frames.pop_front();
+                images_lock.unlock();
+                image.saveToFile("frames/" + std::to_string(frame_index) + ".png");
+                ++frame_index;
+            } else {
+                bool is_kill = !running;
+                images_lock.unlock();
+                if(is_kill)
+                    break;
+            }
+        }
+    });
+
     sf::Image output_image;
     output_image.create(flag_width, flag_height, sf::Color::Transparent);
-    std::vector<sf::Image> frames;
 
     sf::Clock timer;
     while (window.isOpen()) {
@@ -51,14 +78,14 @@ int main() {
 
         texture_output.update(window);
         sf::Image image = texture_output.copyToImage();
+
         output_image.copy(image, 0, 0, sf::IntRect(flag_start_x, flag_start_y, flag_width, flag_height), false);
-        frames.push_back(std::move(output_image));
+        std::lock_guard<std::mutex> lock(images_lock);
+        pending_frames.push_back(output_image);
     }
 
-    system("rm -rf frames/*; mkdir frames");
-    for(size_t i = 0; i < frames.size(); ++i) {
-        frames[i].saveToFile("frames/" + std::to_string(i) + ".png");
-    }
+    running = false;
+    work_thread.join();
     system("ffmpeg -i \"frames/%d.png\" -framerate 24 -filter_complex \"fps=24,split=2[palette_in][gif];[palette_in]palettegen[palette_out];[gif]fifo[gif_fifo]; [gif_fifo][palette_out]paletteuse\" -y frames/output.gif");
 
     return 0;
-- 
cgit v1.2.3