Add Pixmap Recorder module

[0xEAB]

I’m positively surprised how simple it is to create actual video files from frame data. Let’s make it easy as well.

[0xEAB]

I’ve also ported over the “stars” demo from This Week in D issue 2023-12-25.

Code here.

```d import arsd.pixmaprecorder; import arsd.pixmappaint; int main() { // Instantiate a recorder. auto recorder = new PixmapRecorder( 120, "stars.mkv", ); // We will use this framebuffer later on to provide image data // to the encoder. auto frame = Pixmap(640, 400); Color emptyColor = Color.black; frame.data[] = emptyColor; static struct Star { float x; float y; float z; void reset() { import std.random; this.x = uniform(-1.0, 1.0); this.y = uniform(-1.0, 1.0); this.z = uniform(0.1, 1.0); if (this.x == 0) this.x = 0.1; if (this.y == 0) this.y = 0.1; } } Star[] stars; stars.length = 164; // pick a number! foreach (ref star; stars) { star.reset(); } enum max_distance = 0.5; // anything > 0 and <= 1.0 foreach (_foo; 0 .. 6000) { foreach (ref star; stars) { auto drawX = cast(int)((star.x * (1.0 - star.z * max_distance) + 1.0) / 2 * frame.width); auto drawY = cast(int)((star.y * (1.0 - star.z * max_distance) + 1.0) / 2 * frame.height); // erase the old position... unless you're accumulating snow frame.data[drawY * frame.width + drawX] = emptyColor; // for flying through space, adjust z star.z -= 0.005; if (star.z <= 0) star.reset(); if (star.y >= 1 || star.z < 0) star.reset(); drawX = cast(int)((star.x * (1.0 - star.z * max_distance) + 1.0) / 2 * frame.width); drawY = cast(int)((star.y * (1.0 - star.z * max_distance) + 1.0) / 2 * frame.height); // draw the new position frame.data[drawY * frame.width + drawX] = rgb(0xFF, 0xFF, 0xFF); } recorder.put(frame); } // End and finalize the recording process. return recorder.stopRecording(); } ```

[adamdruppe]

nice, yeah, ive been thinking about adding some kind of ffmpeg module eventually