|
 |
3587f3 |
From d716e636231c8d636bf2139896d817b66fe6d510 Mon Sep 17 00:00:00 2001
|
|
|
3587f3 |
From: Marek Kasik <mkasik@redhat.com>
|
|
|
3587f3 |
Date: Thu, 21 Mar 2019 13:15:37 +0100
|
|
|
3587f3 |
Subject: [PATCH 1/2] cairo: Compute correct coverage values for box filter
|
|
|
3587f3 |
|
|
|
3587f3 |
Use double precision for computation of coverage
|
|
|
3587f3 |
of the left most pixel in the box filter.
|
|
|
3587f3 |
|
|
|
3587f3 |
Issue #736
|
|
|
3587f3 |
---
|
|
|
3587f3 |
poppler/CairoRescaleBox.cc | 9 +++++----
|
|
|
3587f3 |
1 file changed, 5 insertions(+), 4 deletions(-)
|
|
|
3587f3 |
|
|
|
3587f3 |
diff --git a/poppler/CairoRescaleBox.cc b/poppler/CairoRescaleBox.cc
|
|
|
3587f3 |
index b8371a5b..d7615010 100644
|
|
|
3587f3 |
--- a/poppler/CairoRescaleBox.cc
|
|
|
3587f3 |
+++ b/poppler/CairoRescaleBox.cc
|
|
|
3587f3 |
@@ -226,10 +227,10 @@ static int compute_coverage (int coverage[], int src_length, int dest_length)
|
|
|
3587f3 |
/* I have a proof of this, which this margin is too narrow to contain */
|
|
|
3587f3 |
for (i=0; i
|
|
|
3587f3 |
{
|
|
|
3587f3 |
- float left_side = i*scale;
|
|
|
3587f3 |
- float right_side = (i+1)*scale;
|
|
|
3587f3 |
- float right_fract = right_side - floor (right_side);
|
|
|
3587f3 |
- float left_fract = ceil (left_side) - left_side;
|
|
|
3587f3 |
+ double left_side = i*scale;
|
|
|
3587f3 |
+ double right_side = (i+1)*scale;
|
|
|
3587f3 |
+ double right_fract = right_side - floor (right_side);
|
|
|
3587f3 |
+ double left_fract = ceil (left_side) - left_side;
|
|
|
3587f3 |
int overage;
|
|
|
3587f3 |
/* find out how many source pixels will be used to fill the box */
|
|
|
3587f3 |
int count = floor (right_side) - ceil (left_side);
|
|
|
3587f3 |
--
|
|
|
3587f3 |
2.20.1
|
|
|
3587f3 |
|