86 lines
3.5 KiB
C#
86 lines
3.5 KiB
C#
using ErsatzTV.Core.Domain;
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using ErsatzTV.Core.Interfaces.Streaming;
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using ErsatzTV.FFmpeg.State;
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using SkiaSharp;
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namespace ErsatzTV.Infrastructure.Streaming.Graphics;
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public abstract class GraphicsElement : IGraphicsElement
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{
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public abstract int ZIndex { get; }
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public abstract string DebugKey { get; }
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public bool IsFinished { get; set; }
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public abstract Task InitializeAsync(GraphicsEngineContext context, CancellationToken cancellationToken);
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public abstract ValueTask<Option<PreparedElementImage>> PrepareImage(
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TimeSpan timeOfDay,
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TimeSpan contentTime,
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TimeSpan contentTotalTime,
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TimeSpan channelTime,
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CancellationToken cancellationToken);
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protected static SKPointI CalculatePosition(
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WatermarkLocation location,
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int frameWidth,
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int frameHeight,
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int imageWidth,
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int imageHeight,
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int horizontalMargin,
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int verticalMargin) =>
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location switch
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{
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WatermarkLocation.BottomLeft => new SKPointI(horizontalMargin, frameHeight - imageHeight - verticalMargin),
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WatermarkLocation.TopLeft => new SKPointI(horizontalMargin, verticalMargin),
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WatermarkLocation.TopRight => new SKPointI(frameWidth - imageWidth - horizontalMargin, verticalMargin),
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WatermarkLocation.TopMiddle => new SKPointI((frameWidth - imageWidth) / 2, verticalMargin),
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WatermarkLocation.RightMiddle => new SKPointI(
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frameWidth - imageWidth - horizontalMargin,
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(frameHeight - imageHeight) / 2),
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WatermarkLocation.BottomMiddle => new SKPointI(
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(frameWidth - imageWidth) / 2,
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frameHeight - imageHeight - verticalMargin),
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WatermarkLocation.LeftMiddle => new SKPointI(horizontalMargin, (frameHeight - imageHeight) / 2),
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WatermarkLocation.MiddleCenter => new SKPointI(
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(frameWidth - imageWidth) / 2 + horizontalMargin,
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(frameHeight - imageHeight) / 2 + verticalMargin),
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_ => new SKPointI(
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frameWidth - imageWidth - horizontalMargin,
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frameHeight - imageHeight - verticalMargin)
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};
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protected static WatermarkMargins NormalMargins(
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Resolution frameSize,
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double horizontalMarginPercent,
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double verticalMarginPercent)
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{
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double horizontalMargin = Math.Round(horizontalMarginPercent / 100.0 * frameSize.Width);
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double verticalMargin = Math.Round(verticalMarginPercent / 100.0 * frameSize.Height);
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return new WatermarkMargins((int)Math.Round(horizontalMargin), (int)Math.Round(verticalMargin));
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}
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protected static WatermarkMargins SourceContentMargins(
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Resolution squarePixelFrameSize,
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Resolution frameSize,
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double horizontalMarginPercent,
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double verticalMarginPercent)
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{
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int horizontalPadding = frameSize.Width - squarePixelFrameSize.Width;
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int verticalPadding = frameSize.Height - squarePixelFrameSize.Height;
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double horizontalMargin = Math.Round(
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horizontalMarginPercent / 100.0 * squarePixelFrameSize.Width
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+ horizontalPadding / 2.0);
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double verticalMargin = Math.Round(
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verticalMarginPercent / 100.0 * squarePixelFrameSize.Height
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+ verticalPadding / 2.0);
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return new WatermarkMargins((int)Math.Round(horizontalMargin), (int)Math.Round(verticalMargin));
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}
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protected sealed record WatermarkMargins(int HorizontalMargin, int VerticalMargin);
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}
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