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Parallel PDF rendering

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This commit is contained in:
Paddy Xu
2017-12-09 15:55:24 +02:00
parent 82994b69bc
commit 6cd837b423
1 changed files with 35 additions and 15 deletions
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50
QuickLook.Plugin/QuickLook.Plugin.PDFViewer/LibMuPdf.cs
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@@ -19,6 +19,7 @@ using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.Runtime.InteropServices;
using System.Threading.Tasks;
using QuickLook.Helpers;
namespace QuickLook.Plugin.PDFViewer
@@ -64,10 +65,10 @@ namespace QuickLook.Plugin.PDFViewer
NativeMethods.ClearPixmap_32(context, pix, 0xFF);
// creates a drawing device
if (App.Is64Bit)
dev = NativeMethods.NewDrawDevice_64(context, pix);
else
dev = NativeMethods.NewDrawDevice_32(context, pix);
dev = App.Is64Bit
? NativeMethods.NewDrawDevice_64(context, pix)
: NativeMethods.NewDrawDevice_32(context, pix);
// draws the page on the device created from the pixmap
if (App.Is64Bit)
NativeMethods.RunPage_64(document, page, dev, ref ctm, IntPtr.Zero);
@@ -87,21 +88,40 @@ namespace QuickLook.Plugin.PDFViewer
unsafe
{
// converts the pixmap data to Bitmap data
byte* ptrSrc;
byte* ptrSrcOrigin;
if (App.Is64Bit)
ptrSrc =
ptrSrcOrigin =
(byte*) NativeMethods.GetSamples_64(context, pix); // gets the rendered data from the pixmap
else
ptrSrc = (byte*) NativeMethods
ptrSrcOrigin = (byte*) NativeMethods
.GetSamples_32(context, pix); // gets the rendered data from the pixmap
var ptrDest = (byte*) imageData.Scan0;
for (var y = 0; y < height; y++)
var ptrDestOrigin = (byte*) imageData.Scan0;
Parallel.For(0, height, y =>
{
var pl = ptrDest;
var sl = ptrSrc;
var ptrDest = ptrDestOrigin + imageData.Stride * y;
var ptrSrc = ptrSrcOrigin + width * 4 * y;
Parallel.For(0, width, x =>
{
var pl = ptrDest + 3 * x;
var sl = ptrSrc + 4 * x;
//Swap these here instead of in MuPDF because most pdf images will be rgb or cmyk.
//Since we are going through the pixels one by one anyway swap here to save a conversion from rgb to bgr.
pl[2] = sl[0]; //b-r
pl[1] = sl[1]; //g-g
pl[0] = sl[2]; //r-b
//sl[3] is the alpha channel, we will skip it here
});
});
/*for (var y = 0; y < height; y++)
{
var pl = ptrDestOrigin;
var sl = ptrSrcOrigin;
for (var x = 0; x < width; x++)
{
//Swap these here instead of in MuPDF because most pdf images will be rgb or cmyk.
//S these here instead of in MuPDF because most pdf images will be rgb or cmyk.
//Since we are going through the pixels one by one anyway swap here to save a conversion from rgb to bgr.
pl[2] = sl[0]; //b-r
pl[1] = sl[1]; //g-g
@@ -110,9 +130,9 @@ namespace QuickLook.Plugin.PDFViewer
pl += 3;
sl += 4;
}
ptrDest += imageData.Stride;
ptrSrc += width * 4;
}
ptrDestOrigin += imageData.Stride;
ptrSrcOrigin += width * 4;
}*/
}
bmp.UnlockBits(imageData);
if (App.Is64Bit)