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Fix #342: better async thumbnail loading

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Paddy Xu
2018-09-07 21:33:49 +03:00
parent 89f1bb46b6
commit 08ccedece4
10 changed files with 287 additions and 84 deletions
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38
QuickLook.Plugin/QuickLook.Plugin.PDFViewer/PdfPageExtension.cs
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@@ -26,27 +26,45 @@ namespace QuickLook.Plugin.PDFViewer
{
internal static class PdfPageExtension
{
public static BitmapSource RenderThumbnail(this PdfDocument doc, int page)
private static int _renderCount;
private static readonly object LockObj = new object();
public static BitmapSource RenderThumbnail(this PdfDocumentWrapper doc, int page)
{
var size = doc.PageSizes[page];
var factorX = 130d / size.Width;
var factorY = 210d / size.Height;
lock (LockObj)
{
if (_renderCount++ == 50)
{
doc.Refresh();
_renderCount = 0;
}
}
var size = doc.PdfDocument.PageSizes[page];
var factorX = 60d / size.Width;
var factorY = 120d / size.Height;
return doc.Render(page, Math.Min(factorX, factorY), false);
}
public static BitmapSource Render(this PdfDocument doc, int page, double factor, bool fixDpi = true)
public static BitmapSource Render(this PdfDocumentWrapper doc, int page, double factor, bool fixDpi = true)
{
var size = doc.PageSizes[page];
var scale = DpiHelper.GetCurrentScaleFactor();
var dpiX = fixDpi ? scale.Horizontal * DpiHelper.DefaultDpi : 96;
var dpiY = fixDpi ? scale.Vertical * DpiHelper.DefaultDpi : 96;
var realWidth = (int) Math.Round(size.Width * scale.Horizontal * factor);
var realHeight = (int) Math.Round(size.Height * scale.Vertical * factor);
Bitmap bitmap;
var bitmap = doc.Render(page, realWidth, realHeight, dpiX, dpiY,
PdfRenderFlags.LimitImageCacheSize | PdfRenderFlags.LcdText | PdfRenderFlags.Annotations|PdfRenderFlags.ForPrinting) as Bitmap;
lock (LockObj)
{
var size = doc.PdfDocument.PageSizes[page];
var realWidth = (int) Math.Round(size.Width * scale.Horizontal * factor);
var realHeight = (int) Math.Round(size.Height * scale.Vertical * factor);
bitmap = doc.PdfDocument.Render(page, realWidth, realHeight, dpiX, dpiY,
PdfRenderFlags.LimitImageCacheSize | PdfRenderFlags.LcdText | PdfRenderFlags.Annotations |
PdfRenderFlags.ForPrinting) as Bitmap;
}
var bs = bitmap?.ToBitmapSource();
bitmap?.Dispose();