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[Gnash-commit] [bug #32629] cairo pixel snapping is broken
From: |
Bastiaan Jacques |
Subject: |
[Gnash-commit] [bug #32629] cairo pixel snapping is broken |
Date: |
Mon, 28 Feb 2011 21:23:27 +0000 |
User-agent: |
Mozilla/5.0 (X11; Linux i686; rv:2.0b11) Gecko/20110209 Firefox/4.0b11 |
URL:
<http://savannah.gnu.org/bugs/?32629>
Summary: cairo pixel snapping is broken
Project: Gnash - The GNU Flash player
Submitted by: bjacques
Submitted on: Mon 28 Feb 2011 10:23:27 PM CET
Category: render-cairo
Severity: 3 - Normal
Release: master
Status: None
Privacy: Public
Assigned to: bjacques
Open/Closed: Open
Discussion Lock: Any
_______________________________________________________
Details:
The Cairo renderer presently implements pixel snapping in a way which converts
any given set of coordinates to pixels, rounds them, and then converts them
back to TWIPS (multiplied by whatever the Character provides).
Pixel snapping is used to provide shapes with sharp edges. Cairo renders
rounded pixel coordinates a lot faster.
When Cairo is finally called upon to render the shape, rounding errors are
introduced (for example, coordinate 83.0000001 by 199.0000001 are actually
used). This slows down drawing a lot, because Cairo is designed to rendering
coordinates exactly as provided.
Instead, the Cairo renderer should do what the AGG renderer does, which is to
convert all the coordinates to pixel coordinates by itself, and then feed them
to the graphics library.
_______________________________________________________
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