Added argument to freeze for setting the end frame, speed is now aware of variable framerates

binding.gyp

@@ -4,6 +4,7 @@
       "target_name": "image",
       "sources": [ "<!@(node -p \"require('fs').readdirSync('./natives').map(f=>'natives/'+f).join(' ')\")" ],
       "cflags!": [ "-fno-exceptions", "<!(pkg-config --cflags Magick++)" ],
+      "cflags_cc": [ "-std=c++17" ],
       "cflags_cc!": [ "-fno-exceptions", "<!(pkg-config --cflags Magick++)" ],
       "include_dirs": [
         "<!@(node -p \"require('node-addon-api').include\")",

commands/image-editing/freeze.js

@@ -1,12 +1,17 @@
 const ImageCommand = require("../../classes/imageCommand.js");
 
 class FreezeCommand extends ImageCommand {
-  params = {
+  params(args) {
-    loop: false
+    const frameCount = parseInt(args[0]);
-  };
+    return {
+      loop: false,
+      frame: isNaN(frameCount) ? -1 : frameCount
+    };
+  }
 
   static description = "Makes an image sequence only play once";
   static aliases = ["noloop", "once"];
+  static arguments = ["{end frame number}"];
 
   static requiresGIF = true;
   static noImage = "you need to provide an image to freeze!";

natives/freeze.cc

@@ -7,14 +7,19 @@ using namespace Magick;
 
 class FreezeWorker : public Napi::AsyncWorker {
  public:
-  FreezeWorker(Napi::Function& callback, string in_path, bool loop, string type, int delay)
+  FreezeWorker(Napi::Function& callback, string in_path, bool loop, int frame, string type, int delay)
-      : Napi::AsyncWorker(callback), in_path(in_path), loop(loop), type(type), delay(delay) {}
+      : Napi::AsyncWorker(callback), in_path(in_path), loop(loop), frame(frame), type(type), delay(delay) {}
   ~FreezeWorker() {}
 
   void Execute() {
     list <Image> frames;
     readImages(&frames, in_path);
 
+    if (frame >= 0 && !loop) {
+      size_t frameSize = frames.size();
+      int framePos = clamp(frame, 0, (int)frameSize);
+      frames.resize(framePos + 1);
+    }
     for_each(frames.begin(), frames.end(), animationIterationsImage(loop ? 0 : 1));
     for_each(frames.begin(), frames.end(), magickImage(type));
 
@@ -28,7 +33,7 @@ class FreezeWorker : public Napi::AsyncWorker {
 
  private:
   string in_path, type;
-  int delay;
+  int frame, delay;
   Blob blob;
   bool loop;
 };
@@ -43,8 +48,9 @@ Napi::Value Freeze(const Napi::CallbackInfo &info)
   bool loop = obj.Has("loop") ? obj.Get("loop").As<Napi::Boolean>().Value() : false;
   string type = obj.Get("type").As<Napi::String>().Utf8Value();
   int delay = obj.Has("delay") ? obj.Get("delay").As<Napi::Number>().Int32Value() : 0;
+  int frame = obj.Has("frame") ? obj.Get("frame").As<Napi::Number>().Int32Value() : -1;
 
-  FreezeWorker* blurWorker = new FreezeWorker(cb, path, loop, type, delay);
+  FreezeWorker* freezeWorker = new FreezeWorker(cb, path, loop, frame, type, delay);
-  blurWorker->Queue();
+  freezeWorker->Queue();
   return env.Undefined();
 }

natives/speed.cc

@@ -15,26 +15,28 @@ class SpeedWorker : public Napi::AsyncWorker {
     list <Image> frames;
     readImages(&frames, in_path);
 
-    int old_delay = 0;
     // if passed a delay, use that. otherwise use the average frame delay.
-    // GIFs can have a variable framerate, and the frameskipping logic here doesn't handle that.
-    // TODO: revisit?
     if (delay == 0) {
       for (Image &image : frames) {
-        old_delay += image.animationDelay();
+        int old_delay = image.animationDelay();
+        int new_delay = slow ? old_delay * 2 : old_delay / 2;
+        if (!slow && new_delay <= 1) {
+          new_delay = delay;
+          auto it = frames.begin();
+          while(it != frames.end() && ++it != frames.end()) it = frames.erase(it);
+        } else {
+          image.animationDelay(new_delay);
+        }
       }
-      old_delay /= frames.size();
     } else {
-      old_delay = delay;
+      int new_delay = slow ? delay * 2 : delay / 2;
-    }
+      if (!slow && new_delay <= 1) {
-
+        new_delay = delay;
-    int new_delay = slow ? old_delay * 2 : old_delay / 2;
+        auto it = frames.begin();
-    if (!slow && new_delay <= 1) {
+        while(it != frames.end() && ++it != frames.end()) it = frames.erase(it);
-      new_delay = old_delay;
+      } else {
-      auto it = frames.begin();
+        for_each(frames.begin(), frames.end(), animationDelayImage(new_delay));
-      while(it != frames.end() && ++it != frames.end()) it = frames.erase(it);
+      }
-    } else {
-      for_each(frames.begin(), frames.end(), animationDelayImage(new_delay));
     }
 
     for_each(frames.begin(), frames.end(), magickImage(type));

utils/imagedetect.js

@@ -35,6 +35,9 @@ const getImage = async (image, image2, video, gifv = false) => {
     if (gifv) {
       const host = new URL(image2).host;
       if (tenorURLs.includes(host)) {
+        // Tenor doesn't let us access a raw GIF without going through their API,
+        // so we use that if there's a key in the config and fall back to using the MP4 if there isn't
+        // Note that MP4 conversion requires an ImageMagick build that supports MPEG decoding
         if (process.env.TENOR !== "") {
           const data = await fetch(`https://api.tenor.com/v1/gifs?ids=${image2.split("-").pop()}&key=${process.env.TENOR}`);
           const json = await data.json();
@@ -44,10 +47,13 @@ const getImage = async (image, image2, video, gifv = false) => {
           payload.delay = (100 / delay.split("/")[0]) * delay.split("/")[1];
         }
       } else if (giphyURLs.includes(host)) {
+        // Can result in an HTML page instead of a GIF
         payload.path = `https://media0.giphy.com/media/${image2.split("-").pop()}/giphy.gif`;
       } else if (imgurURLs.includes(host)) {
+        // Seems that Tenor has a possibility of making GIFs static
         payload.path = image.replace(".mp4", ".gif");
       } else if (gfycatURLs.includes(host)) {
+        // iirc Gfycat also seems to sometimes make GIFs static
         payload.path = `https://thumbs.gfycat.com/${image.split("/").pop().split(".mp4")[0]}-size_restricted.gif`;
       }
       payload.type = "image/gif";