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Vertical text alignment and positioning fix#670
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PreferLinux wants to merge 4 commits intomono:mainfrom
Open
Vertical text alignment and positioning fix#670PreferLinux wants to merge 4 commits intomono:mainfrom
PreferLinux wants to merge 4 commits intomono:mainfrom
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Add basic MeasureString alignment tests for combining Vertical and RightToLeft. Also run the alignment tests with a zero-size rectangle to check correct alignment in that situation. Add GraphicsPath test for Vertical strings.
In pango_DrawString, the StringFormat can be null. I didn't handle that correctly.
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Nice, a test failure in CI that I don't get on my machine. Will have to add some debugging to that test, and then revert it... |
Contributor
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Actually, didn't need to. It is simply that the Linux testing uses Cairo text rendering (due to an old Pango version), and that can't handle the tests I added. Those tests have now been made conditional. |
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Before fix:
The vertical text is being drawn off-screen. Note the boxes (from measuring the string) for vertical left-to-right are correct, hence no test failures.
GdipAddPathString()has much the same issue, so I've added a test there that has vertical text to detect the incorrect drawing location (fails without fix). I've also added tests for alignment when drawing at a point instead of in a box, and drawing with both vertical and right-to-left (which fail without the fix).Here's a screenshot with only the changes to
pango_DrawStringapplied, fixing the drawing location:On vertical text the alignment is opposite what it should be, and on right-to-left it is also significantly offset horizontally. Hence there are also changes dealing with alignment.
With all changes:
.Net / Windows 8.1 as a comparison:
Test application: text-align.txt
Compiles with
mcs -r:System.Windows.Forms,System.Drawing text-align.txt -unsafeFurthermore, as
gdip_pango_setup_layouttransforms the Cairo context on vertical text,GdipAddPathString()wasn't getting the correct path points. I've changed it to save and later restore the context to fix this.