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From d716e636231c8d636bf2139896d817b66fe6d510 Mon Sep 17 00:00:00 2001
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From: Marek Kasik <mkasik@redhat.com>
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Date: Thu, 21 Mar 2019 13:15:37 +0100
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Subject: [PATCH 1/2] cairo: Compute correct coverage values for box filter
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Use double precision for computation of coverage
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of the left most pixel in the box filter.
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Issue #736
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---
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poppler/CairoRescaleBox.cc | 9 +++++----
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1 file changed, 5 insertions(+), 4 deletions(-)
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diff --git a/poppler/CairoRescaleBox.cc b/poppler/CairoRescaleBox.cc
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index b8371a5b..d7615010 100644
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--- a/poppler/CairoRescaleBox.cc
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+++ b/poppler/CairoRescaleBox.cc
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@@ -226,10 +227,10 @@ static int compute_coverage (int coverage[], int src_length, int dest_length)
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/* I have a proof of this, which this margin is too narrow to contain */
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for (i=0; i
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{
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- float left_side = i*scale;
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- float right_side = (i+1)*scale;
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- float right_fract = right_side - floor (right_side);
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- float left_fract = ceil (left_side) - left_side;
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+ double left_side = i*scale;
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+ double right_side = (i+1)*scale;
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+ double right_fract = right_side - floor (right_side);
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+ double left_fract = ceil (left_side) - left_side;
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int overage;
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/* find out how many source pixels will be used to fill the box */
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int count = floor (right_side) - ceil (left_side);
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--
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2.20.1
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