Branch: refs/heads/main
Home: https://github.com/WebKit/WebKit
Commit: 7754d9bf5ef54b9c4c58bdace2e3cd25da11df2c
https://github.com/WebKit/WebKit/commit/7754d9bf5ef54b9c4c58bdace2e3cd25da11df2c
Author: Simon Fraser <[email protected]>
Date: 2024-05-04 (Sat, 04 May 2024)
Changed paths:
M Source/WebKit/WebProcess/Plugins/PDF/UnifiedPDF/AsyncPDFRenderer.mm
Log Message:
-----------
[UnifiedPDF] Text jiggles between the low-res page snapshots and
high-resolution tiles
https://bugs.webkit.org/show_bug.cgi?id=273727
rdar://127523619
Reviewed by Tim Horton.
Fix two issues that caused text and other content to not be perfectly aligned
between
page previews and high-resolution tiles.
First, the scale are always non-integral, so there was some slight scaling of
the
page preview buffers in `AsyncPDFRenderer::paintPagePreview()` since the image
buffer size
is an expanded integral value, and when painting without a sourceRect, it
scales the whole
buffer to fit the destination rect. We can use the same rect for source and
destination
to avoid this.
Second, turn off CG font subpixel quantization and positioning, both of which
can cause
glyphs to snap when drawing into the scaled-down context used for page previews.
* Source/WebKit/WebProcess/Plugins/PDF/UnifiedPDF/AsyncPDFRenderer.mm:
(WebKit::AsyncPDFRenderer::paintPDFPageIntoBuffer):
(WebKit::AsyncPDFRenderer::paintPagePreview):
Canonical link: https://commits.webkit.org/278378@main
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