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26 lines
1.1 KiB
Diff
26 lines
1.1 KiB
Diff
From bf0e0b71360cfbc690a29f4abe15d7b9b61b8479 Mon Sep 17 00:00:00 2001
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From: Tom Hughes <tom@compton.nu>
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Date: Sat, 22 Jun 2013 12:11:54 +0100
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Subject: [PATCH 12/15] Avoid pixel artifacts when compositing
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Change src_over alpha to avoid pixel artifacts by reordering computations.
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---
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include/agg_pixfmt_rgba.h | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/include/agg_pixfmt_rgba.h b/include/agg_pixfmt_rgba.h
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index 5d6b511..bb255cd 100644
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--- a/include/agg_pixfmt_rgba.h
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+++ b/include/agg_pixfmt_rgba.h
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@@ -346,7 +346,7 @@ namespace agg
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p[Order::R] = (value_type)(sr + ((p[Order::R] * s1a + base_mask) >> base_shift));
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p[Order::G] = (value_type)(sg + ((p[Order::G] * s1a + base_mask) >> base_shift));
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p[Order::B] = (value_type)(sb + ((p[Order::B] * s1a + base_mask) >> base_shift));
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- p[Order::A] = (value_type)(sa + p[Order::A] - ((sa * p[Order::A] + base_mask) >> base_shift));
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+ p[Order::A] = (value_type)(sa + ((p[Order::A] * s1a + base_mask) >> base_shift));
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}
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};
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--
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1.8.1.4
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