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Resize PDF images too (Docnet rendering)

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This commit is contained in:
Michael Babienco
2026-03-12 21:09:34 +09:00
parent aed85c7555
commit f34a7092e4
1 changed files with 39 additions and 7 deletions
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src/ViewModels/MainViewModel.cs
+39 -7
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@@ -834,6 +834,14 @@ class MainViewModel : BaseViewModel, IFontResolver, ICanCheckShutdown
var info = new FileInfo(file.FilePath); var info = new FileInfo(file.FilePath);
uint loadedImageWidth = 0; uint loadedImageWidth = 0;
uint loadedImageHeight = 0; uint loadedImageHeight = 0;
// get max pixel height remaining for items on this page
// (For multi-page PDFs, showing page 2 and on will have more height since they have no title,
// but to keep things consistent we will use the same height for all PDF pages.)
// render up to now on this page and get height remaining in inches
var currPageCount = pdfRenderer.DocumentRenderer.FormattedDocument?.PageCount;
var heightForExistingItemsOnPage = GetExistingPageItemHeight(pdfRenderer, footerParagraphHeight);
var remainingHeightInches = pageHeight - (2 * margin) - heightForExistingItemsOnPage;
var remainingHeightPixels = (remainingHeightInches * imageResolution) - imageInsertMarginPixels;
if (!isPDF) if (!isPDF)
{ {
using var mImage = new MagickImage(info.FullName); using var mImage = new MagickImage(info.FullName);
@@ -875,12 +883,6 @@ class MainViewModel : BaseViewModel, IFontResolver, ICanCheckShutdown
filePath = convertedOutputPath; filePath = convertedOutputPath;
LogInfo(string.Format("Saved adjusted image to JPEG; file path is now {0}", filePath)); LogInfo(string.Format("Saved adjusted image to JPEG; file path is now {0}", filePath));
} }
// do some calculations...
// render up to now on this page and get height remaining in inches
var currPageCount = pdfRenderer.DocumentRenderer.FormattedDocument?.PageCount;
var heightForExistingItemsOnPage = GetExistingPageItemHeight(pdfRenderer, footerParagraphHeight);
var remainingHeightInches = pageHeight - (2 * margin) - heightForExistingItemsOnPage;
var remainingHeightPixels = (remainingHeightInches * imageResolution) - imageInsertMarginPixels;
// write to PDF // write to PDF
var paragraph = section.AddParagraph(); var paragraph = section.AddParagraph();
paragraph.Format.Alignment = ParagraphAlignment.Center; paragraph.Format.Alignment = ParagraphAlignment.Center;
@@ -940,10 +942,23 @@ class MainViewModel : BaseViewModel, IFontResolver, ICanCheckShutdown
pgCount == 1 ? "" : "s")); pgCount == 1 ? "" : "s"));
var paragraph = section.AddParagraph(); var paragraph = section.AddParagraph();
paragraph.Format.Alignment = ParagraphAlignment.Center; paragraph.Format.Alignment = ParagraphAlignment.Center;
// get image height/width off of disk so we can resize down if needed
var image = paragraph.AddImage(convertedPdfImagePath); var image = paragraph.AddImage(convertedPdfImagePath);
image.Width = maxImageWidth;
image.LockAspectRatio = true; image.LockAspectRatio = true;
image.LineFormat = imageLineFormat.Clone(); image.LineFormat = imageLineFormat.Clone();
using (var firstPdfPageImage = new MagickImage(convertedPdfImagePath))
{
var pdfPageImageWidth = firstPdfPageImage.Width;
var pdfPageImageHeight = firstPdfPageImage.Height;
// resize down until it will fit on the page
while (pdfPageImageHeight > remainingHeightPixels || pdfPageImageWidth > maxItemPxWidth)
{
pdfPageImageHeight = (uint)Math.Floor(pdfPageImageHeight * 0.95);
pdfPageImageWidth = (uint)Math.Floor(pdfPageImageWidth * 0.95);
}
image.Height = pdfPageImageHeight;
image.Width = pdfPageImageWidth;
}
for (var j = 1; j < pgCount; j++) for (var j = 1; j < pgCount; j++)
{ {
section.AddPageBreak(); section.AddPageBreak();
@@ -954,11 +969,28 @@ class MainViewModel : BaseViewModel, IFontResolver, ICanCheckShutdown
image.LockAspectRatio = true; image.LockAspectRatio = true;
image.Width = maxImageWidth; image.Width = maxImageWidth;
image.LineFormat = imageLineFormat.Clone(); image.LineFormat = imageLineFormat.Clone();
using (var otherPdfPageImage = new MagickImage(convertedPdfImagePath))
{
var pdfPageImageWidth = otherPdfPageImage.Width;
var pdfPageImageHeight = otherPdfPageImage.Height;
// resize down until it will fit on the page
while (pdfPageImageHeight > remainingHeightPixels || pdfPageImageWidth > maxItemPxWidth)
{
pdfPageImageHeight = (uint)Math.Floor(pdfPageImageHeight * 0.95);
pdfPageImageWidth = (uint)Math.Floor(pdfPageImageWidth * 0.95);
}
image.Height = pdfPageImageHeight;
image.Width = pdfPageImageWidth;
}
} }
} }
} }
else else
{ {
// use older, not-docnet rendering method.
// uses MigraDoc rendering. Does not work with annotations, and since Migradoc
// doesn't let us know how big the image is, we can't do the image resizing, so
// we just do our best.
// render first page (eventually need to improve code to just do everything in a loop) // render first page (eventually need to improve code to just do everything in a loop)
var paragraph = section.AddParagraph(); var paragraph = section.AddParagraph();
paragraph.Format.Alignment = ParagraphAlignment.Center; paragraph.Format.Alignment = ParagraphAlignment.Center;