public override void Draw()
{
if (video == null)
{
return;
}
if (!stopped && !paused)
{
var nextFrame = 0;
if (video.HasAudio && !Game.Sound.DummyEngine)
{
nextFrame = (int)float2.Lerp(0, video.Frames, Game.Sound.VideoSeekPosition * invLength);
}
else
{
nextFrame = video.CurrentFrame + 1;
}
// Without the 2nd check the sound playback sometimes ends before the final frame is displayed which causes the player to be stuck on the first frame
if (nextFrame > video.Frames || nextFrame < video.CurrentFrame)
{
Stop();
return;
}
var skippedFrames = 0;
while (nextFrame > video.CurrentFrame)
{
video.AdvanceFrame();
videoSprite.Sheet.GetTexture().SetData(video.FrameData);
skippedFrames++;
}
if (skippedFrames > 1)
{
Log.Write("perf", "VqaPlayer : {0} skipped {1} frames at position {2}", cachedVideo, skippedFrames, video.CurrentFrame);
}
}
WidgetUtils.DrawSprite(videoSprite, videoOrigin, videoSize);
if (DrawOverlay)
{
// Create the scan line grid to render over the video
// To avoid aliasing, this must be an integer number of screen pixels.
// A few complications to be aware of:
// - The video may have a different aspect ratio to the widget RenderBounds
// - The RenderBounds coordinates may be a non-integer scale of the screen pixel size
// - The screen pixel size may change while the video is playing back
// (user moves a window between displays with different DPI on macOS)
var scale = Game.Renderer.WindowScale;
if (overlaySheet == null || overlayScale != scale)
{
overlaySheet?.Dispose();
// Calculate the scan line height by converting the video scale (copied from Open()) to screen
// pixels, halving it (scan lines cover half the pixel height), and rounding to the nearest integer.
var videoScale = Math.Min((float)RenderBounds.Width / video.Width, RenderBounds.Height / (video.Height * AspectRatio));
var halfRowHeight = (int)(videoScale * scale / 2 + 0.5f);
// The overlay can be minimally stored in a 1px column which is stretched to cover the full screen
var overlayHeight = (int)(RenderBounds.Height * scale / halfRowHeight);
var overlaySheetSize = new Size(1, Exts.NextPowerOf2(overlayHeight));
var overlay = new byte[4 * Exts.NextPowerOf2(overlayHeight)];
overlaySheet = new Sheet(SheetType.BGRA, overlaySheetSize);
// Every second pixel is the scan line - set alpha to 128 to make the lines less harsh
for (var i = 3; i < 4 * overlayHeight; i += 8)
{
overlay[i] = 128;
}
overlaySheet.GetTexture().SetData(overlay, overlaySheetSize.Width, overlaySheetSize.Height);
overlaySprite = new Sprite(overlaySheet, new Rectangle(0, 0, 1, overlayHeight), TextureChannel.RGBA);
// Overlay origin must be rounded to the nearest screen pixel to prevent aliasing
overlayOrigin = new float2((int)(RenderBounds.X * scale + 0.5f), (int)(RenderBounds.Y * scale + 0.5f)) / scale;
overlaySize = new float2(RenderBounds.Width, overlayHeight * halfRowHeight / scale);
overlayScale = scale;
}
WidgetUtils.DrawSprite(overlaySprite, overlayOrigin, overlaySize);
}
}
