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CairoSDPR: Make PixelSnap better aligned

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Change-Id: I64ca3e6bd0690ea14e95f3ed0969c320a45f30d6
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/172043
Tested-by: Jenkins
Reviewed-by: Armin Le Grand <Armin.Le.Grand@me.com>
This commit is contained in:
Armin Le Grand (Collabora) 2024-08-19 17:38:52 +02:00 committed by Armin Le Grand
parent fe27013495
commit 19cea16244
1 changed files with 4 additions and 4 deletions
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8
drawinglayer/source/processor2d/cairopixelprocessor2d.cxx
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@ -329,12 +329,12 @@ void checkAndDoPixelSnap(cairo_t* pRT,
// transform to discrete pixels
cairo_user_to_device(pRT, pX, pY);
// round them, also subtract 0.5 which will be as transform in
// round them, also add 0.5 which will be as transform in
// the paint method to move to 'inside' pixels when AA used.
// remember: this is only done when AA is active (see bPixelSnap
// above)
*pX = basegfx::fround(*pX) - 0.5;
*pY = basegfx::fround(*pY) - 0.5;
// above) and moves the hairline to full-pixel position
*pX = trunc(*pX) + 0.5;
*pY = trunc(*pY) + 0.5;
// transform back to former transformed state
cairo_device_to_user(pRT, pX, pY);