wehub-resource-sync
106 lines
4.4 KiB
C#
106 lines
4.4 KiB
C#
#nullable enable
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using System.IO;
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using SharpDX;
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using SharpDX.Direct3D11;
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using SharpDX.WIC;
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using T3.Core.Resource;
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namespace T3.Editor.Gui.Help;
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/// <summary>
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/// Loads referenced video thumbnails (<c>.help/references/thumbs/<id>.jpg</c> covers and
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/// <c><id>_<sec>.jpg</c> per-reference moment frames) into GPU textures for the help resource tooltips,
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/// caching the shader-resource view per key for the session. Decoding happens on first request (a few ms); a
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/// missing or unreadable file is remembered so it isn't retried.
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/// </summary>
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internal static class VideoThumbnails
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{
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/// <summary>Resolves the ImGui texture handle for the video's cover thumbnail, or false when none is available.</summary>
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internal static bool TryGetTexture(string videoId, out IntPtr textureId, out float aspectRatio)
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{
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if (!_cache.TryGetValue(videoId, out var entry))
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{
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entry = Load(Path.Combine(ShippedContent.ResolveDirectory(".help", "references", "thumbs"),
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videoId + ".jpg"));
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_cache[videoId] = entry;
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}
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textureId = entry.TextureId;
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aspectRatio = entry.AspectRatio;
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return entry.TextureId != IntPtr.Zero;
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}
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/// <summary>Resolves a per-reference preview frame (the moment the reference points at); false when none exists.</summary>
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internal static bool TryGetMoment(string videoId, int startSecond, out IntPtr textureId, out float aspectRatio)
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{
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var key = videoId + "_" + startSecond;
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if (!_clipCache.TryGetValue(key, out var entry))
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{
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entry = Load(Path.Combine(ShippedContent.ResolveDirectory(".help", "references", "thumbs"),
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key + ".jpg"));
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_clipCache[key] = entry;
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}
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textureId = entry.TextureId;
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aspectRatio = entry.AspectRatio;
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return entry.TextureId != IntPtr.Zero;
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}
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private static Entry Load(string path)
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{
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if (!File.Exists(path))
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return Entry.Missing;
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try
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{
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using var factory = new ImagingFactory();
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using var decoder = new BitmapDecoder(factory, path, DecodeOptions.CacheOnDemand);
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using var frame = decoder.GetFrame(0);
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using var converter = new FormatConverter(factory);
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converter.Initialize(frame, PixelFormat.Format32bppRGBA);
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var width = converter.Size.Width;
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var height = converter.Size.Height;
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var stride = width * 4;
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using var buffer = new DataStream(height * stride, true, true);
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converter.CopyPixels(stride, buffer);
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// Texture and SRV are held for the session: the native pointer must stay valid while ImGui draws it.
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var texture = new Texture2D(ResourceManager.Device,
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new Texture2DDescription
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{
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Width = width,
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Height = height,
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ArraySize = 1,
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BindFlags = BindFlags.ShaderResource,
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Usage = ResourceUsage.Immutable,
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Format = SharpDX.DXGI.Format.R8G8B8A8_UNorm,
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MipLevels = 1,
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SampleDescription = new SharpDX.DXGI.SampleDescription(1, 0),
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},
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new DataRectangle(buffer.DataPointer, stride));
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var srv = SrvManager.GetSrvForTexture(texture);
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if (srv == null)
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return Entry.Missing;
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return new Entry(srv.NativePointer, height == 0 ? DefaultAspect : (float)width / height, texture);
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}
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catch (Exception e)
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{
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Log.Debug($"Could not load video thumbnail '{path}': {e.Message}");
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return Entry.Missing;
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}
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}
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private const float DefaultAspect = 16f / 9f;
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private readonly record struct Entry(IntPtr TextureId, float AspectRatio, Texture2D? Texture)
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{
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internal static readonly Entry Missing = new(IntPtr.Zero, DefaultAspect, null);
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}
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private static readonly Dictionary<string, Entry> _cache = new();
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private static readonly Dictionary<string, Entry> _clipCache = new();
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}
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