gramps
ab29ec801d
- FindContentBounds already trimmed the bitmap; the grid/box still rendered at the uncropped user size, so Fill stretched the tight widget into a bigger frame = dead-between-content-and-border. - ContentCanvasSize maps the crop rect to canvas units (1920/pixW per axis, DPI-correct) and the preview event now carries (bitmap, canvasW, canvasH). - OnWebView2PreviewBitmapChanged sets the element Width/Height to that size; the grid and the SelectionOverlay (both bound to the element's Width/Height) now equal the widget exactly. - IsPreviewDragging (set in MainWindow drag/resize) suppresses auto-fit mid-gesture. - Tests 10/10 (alpha bounds, canvas-size mapping incl. DPI, control size); 0 warnings.
275 lines
9.7 KiB
C#
275 lines
9.7 KiB
C#
using System;
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using System.Drawing;
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using System.IO;
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using System.Text.Json;
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using System.Windows;
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using System.Windows.Controls;
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using System.Windows.Media;
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using System.Windows.Media.Imaging;
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using System.Windows.Threading;
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using Microsoft.Web.WebView2.Core;
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using Microsoft.Web.WebView2.Wpf;
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using ytLive.Helpers;
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using ytLive.Models;
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namespace ytLive.Services;
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public sealed class WebView2Manager : IDisposable
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{
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private readonly Panel _hostPanel;
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private readonly Dispatcher _dispatcher;
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private readonly Dictionary<string, WebSourceSession> _sessions = new();
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public event Action<string, WriteableBitmap, double, double>? PreviewBitmapChanged;
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private sealed class WebSourceSession
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{
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public required WebView2 Control { get; init; }
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public required DispatcherTimer CaptureTimer { get; init; }
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public VideoFrame? LatestFrame;
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public bool Disposed;
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public bool Initialized;
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}
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public WebView2Manager(Panel hostPanel, Dispatcher dispatcher)
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{
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_hostPanel = hostPanel;
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_dispatcher = dispatcher;
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}
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public void Register(Source source)
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{
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if (_sessions.ContainsKey(source.Id)) return;
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// OBS model: the page renders at the MASTER CANVAS size (1920×1080),
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// stable, never tracked. Full-bleed widgets (designed for the canvas)
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// render fully instead of being clipped to a small box-sized viewport;
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// dragging the box never reflows the page. The capture is tightly
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// cropped to the widget's ALPHA bounding box (FindContentBounds) and
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// the display (Stretch=Fill) maps it flush under the box, anchored at
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// (0,0) — no DOM query, so no timing fragility; worst case is the
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// full frame, which is the confirmed-good rendering.
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var webView = new WebView2
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{
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Width = 1920,
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Height = 1080,
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DefaultBackgroundColor = System.Drawing.Color.Transparent,
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Visibility = System.Windows.Visibility.Visible,
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};
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Canvas.SetLeft(webView, -5000);
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Canvas.SetTop(webView, -5000);
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_hostPanel.Children.Add(webView);
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var timer = new DispatcherTimer
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{
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Interval = TimeSpan.FromMilliseconds(100),
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};
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var session = new WebSourceSession
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{
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Control = webView,
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CaptureTimer = timer,
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};
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_sessions[source.Id] = session;
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timer.Tick += (_, _) =>
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{
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if (!session.Disposed && session.Initialized)
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_ = CaptureFrame(source.Id);
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};
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_ = InitializeAsync(source, session);
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}
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public void Unregister(string sourceId) => RemoveSession(sourceId);
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public void OnWebUriChanged(Source source)
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{
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if (!_sessions.TryGetValue(source.Id, out var session)) return;
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if (session.Disposed || !session.Initialized) return;
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if (string.IsNullOrEmpty(source.WebUri))
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{
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session.LatestFrame = null;
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session.Control.CoreWebView2?.NavigateToString(
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"<html><body style='background:transparent;margin:0'></body></html>");
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return;
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}
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Navigate(source.WebUri, session);
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}
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public VideoFrame? GetLatestFrame(string sourceId)
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{
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return _sessions.TryGetValue(sourceId, out var session) ? session.LatestFrame : null;
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}
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private async Task InitializeAsync(Source source, WebSourceSession session)
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{
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try
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{
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await session.Control.EnsureCoreWebView2Async();
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var cws = session.Control.CoreWebView2!;
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cws.NavigationStarting += (_, _) =>
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{
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_ = cws.ExecuteScriptAsync(
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"document.documentElement.style.background='transparent';" +
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"document.documentElement.style.overflow='hidden';" +
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"document.body.style.background='transparent';" +
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"document.body.style.overflow='hidden';");
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};
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cws.NavigationCompleted += (_, _) =>
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{
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_ = cws.ExecuteScriptAsync(
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"document.documentElement.style.background='transparent';" +
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"document.documentElement.style.overflow='hidden';" +
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"document.body.style.background='transparent';" +
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"document.body.style.overflow='hidden';");
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_ = CaptureFrame(source.Id);
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};
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session.Initialized = true;
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session.Control.CoreWebView2.NavigateToString(
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"<html><body style='background:transparent;margin:0'></body></html>");
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if (!string.IsNullOrEmpty(source.WebUri))
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Navigate(source.WebUri, session);
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session.CaptureTimer.Start();
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}
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catch (Exception ex)
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{
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AppLog.Write($"WebView2Manager: init failed for '{source.Name}': {ex.Message}");
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RemoveSession(source.Id);
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}
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}
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private void Navigate(string url, WebSourceSession session)
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{
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try { session.Control.CoreWebView2?.Navigate(url); }
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catch (Exception ex) { AppLog.Write($"WebView2Manager: navigate failed: {ex.Message}"); }
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}
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// The widget's extent is measured from the captured frame itself: the
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// bounding box of non-transparent pixels (the background is injected
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// transparent, so the alpha channel IS the widget). This is immune to
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// DOM timing (fonts/images/animations), needs no JS round-trip, and
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// CANNOT break rendering: if the widget fills the canvas the box equals
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// the full frame (identical to the confirmed-good uncropped display); if
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// it floats in transparent margin, the crop maps it flush under the box.
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internal static (int X, int Y, int W, int H) FindContentBounds(byte[] pixels, int pixW, int pixH, int stride)
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{
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int minX = pixW, minY = pixH, maxX = -1, maxY = -1;
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for (var y = 0; y < pixH; y++)
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{
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var row = y * stride;
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for (var x = 0; x < pixW; x++)
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{
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if (pixels[row + x * 4 + 3] == 0) continue;
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if (x < minX) minX = x;
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if (x > maxX) maxX = x;
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if (y < minY) minY = y;
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if (y > maxY) maxY = y;
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}
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}
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if (maxX < minX || maxY < minY) return (0, 0, pixW, pixH);
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return (minX, minY, maxX - minX + 1, maxY - minY + 1);
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}
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// The cropped pixel extent, expressed in MASTER CANVAS units (the WebView2 is
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// 1920×1080 DIPs and captures at its physical size, so 1920/pixW maps capture
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// pixels back to canvas units). The element grid + selection box are sized to
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// this, so the container matches the content exactly instead of Fill-stretching
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// a cropped bitmap into a larger frame.
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internal static (double W, double H) ContentCanvasSize(int cropW, int cropH, int pixW, int pixH)
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=> (cropW * (1920.0 / pixW), cropH * (1080.0 / pixH));
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private async Task CaptureFrame(string sourceId)
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{
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if (!_sessions.TryGetValue(sourceId, out var session) || session.Disposed) return;
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try
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{
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var webView = session.Control;
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if (webView.CoreWebView2 == null) return;
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using var ms = new MemoryStream();
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await webView.CoreWebView2.CapturePreviewAsync(
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CoreWebView2CapturePreviewImageFormat.Png, ms);
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ms.Position = 0;
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var bitmap = new BitmapImage();
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bitmap.BeginInit();
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bitmap.StreamSource = ms;
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bitmap.CacheOption = BitmapCacheOption.OnLoad;
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bitmap.EndInit();
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bitmap.Freeze();
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var formatted = new FormatConvertedBitmap(bitmap,
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PixelFormats.Bgra32, null, 0);
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var pixW = formatted.PixelWidth;
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var pixH = formatted.PixelHeight;
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if (pixW < 1 || pixH < 1) return;
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var pixels = new byte[pixW * pixH * 4];
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formatted.CopyPixels(pixels, pixW * 4, 0);
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var stride = pixW * 4;
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var (cropX, cropY, cropW, cropH) = FindContentBounds(pixels, pixW, pixH, stride);
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var outPixels = pixels;
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if (cropW != pixW || cropH != pixH || cropX != 0 || cropY != 0)
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{
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var dstStride = cropW * 4;
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outPixels = new byte[dstStride * cropH];
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for (var r = 0; r < cropH; r++)
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Buffer.BlockCopy(pixels, (cropY + r) * stride + cropX * 4, outPixels, r * dstStride, dstStride);
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}
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var wb = new WriteableBitmap(cropW, cropH, 96, 96, PixelFormats.Bgra32, null);
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wb.WritePixels(new Int32Rect(0, 0, cropW, cropH), outPixels, cropW * 4, 0);
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wb.Freeze();
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var (canvasW, canvasH) = ContentCanvasSize(cropW, cropH, pixW, pixH);
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session.LatestFrame = new VideoFrame(cropW, cropH, outPixels);
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_ = _dispatcher.BeginInvoke(() =>
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{
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PreviewBitmapChanged?.Invoke(sourceId, wb, canvasW, canvasH);
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});
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}
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catch (ObjectDisposedException) { }
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catch (InvalidOperationException) { }
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catch (Exception ex)
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{
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AppLog.Write($"WebView2Manager: capture failed for '{sourceId}': {ex.Message}");
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}
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}
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private void RemoveSession(string sourceId)
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{
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if (!_sessions.TryGetValue(sourceId, out var session)) return;
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session.Disposed = true;
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session.CaptureTimer.Stop();
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_hostPanel.Children.Remove(session.Control);
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try { session.Control.Dispose(); } catch { }
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_sessions.Remove(sourceId);
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}
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public void Dispose()
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{
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foreach (var id in _sessions.Keys.ToList())
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RemoveSession(id);
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}
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}
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