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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Subpixel rendering: pixel snapping rounds to wrong position."
href="https://bugs.webkit.org/show_bug.cgi?id=146273">146273</a>
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<th>Summary</th>
<td>Subpixel rendering: pixel snapping rounds to wrong position.
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr>
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<th>Product</th>
<td>WebKit
</td>
</tr>
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<th>Version</th>
<td>528+ (Nightly build)
</td>
</tr>
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<th>Hardware</th>
<td>Unspecified
</td>
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<th>OS</th>
<td>Unspecified
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>Normal
</td>
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<th>Priority</th>
<td>P2
</td>
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<th>Component</th>
<td>Layout and Rendering
</td>
</tr>
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<th>Assignee</th>
<td>webkit-unassigned@lists.webkit.org
</td>
</tr>
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<th>Reporter</th>
<td>zalan@apple.com
</td>
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<p>
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<pre>RenderLayer::paintForegroundForFragmentsWithPhase() gets a fragment with a foregroundRect of, say:
(WebCore::LayoutRect) $23 = (m_location = { x = -96452px (-6172928), y = 0px (0) }, m_size = { width = 146px (9344), height = 310px (19840) })
where -96452 is the left edge of the layer (negative, because we're in vertical-rl content).
snapRectToDevicePixels() is converting that to:
(const WebCore::FloatRect) $24 = {
m_location = (m_x = -96451.5, m_y = 0)
m_size = (m_width = 146, m_height = 310)
}</pre>
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