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# --- SDE-COPYRIGHT-NOTE-BEGIN ---
# This copyright note is auto-generated by ./scripts/Create-CopyPatch.
#
# Filename: package/.../libtiff/thumbnail-fixup.patch
# Copyright (C) 2004 - 2006 The T2 SDE Project
#
# More information can be found in the files COPYING and README.
#
# This patch file is dual-licensed. It is available under the license the
# patched project is licensed under, as long as it is an OpenSource license
# as defined at http://www.opensource.org/ (e.g. BSD, X11) or under the terms
# of the GNU General Public License as published by the Free Software
# Foundation; either version 2 of the License, or (at your option) any later
# version.
# --- SDE-COPYRIGHT-NOTE-END ---
The box filter bit masking is broken in several ways - I wonder it ever worked
for anyone ...
Marked clamp inline, just in case.
- Rene Rebe <rene@exactcode.de> for Archivista GmbH Zürich
--- tiff-3.7.3/tools/thumbnail.c 2005-07-05 18:38:16.000000000 +0200
+++ tiff-3.7.3-hackery/tools/thumbnail.c 2005-09-30 20:36:44.000000000 +0200
@@ -369,7 +369,7 @@
}
}
-static int clamp(float v, int low, int high)
+static int inline clamp(float v, int low, int high)
{ return (v < low ? low : v > high ? high : (int)v); }
#ifndef M_E
@@ -453,13 +453,15 @@
}
rowoff[x] = sx0 >> 3;
fw = sx - sx0; /* width */
+ if (fw == 0) fw = 1;
+
+ src1[x] = fw;
b = (fw < 8) ? 0xff<<(8-fw) : 0xff;
src0[x] = b >> (sx0&7);
fw -= 8 - (sx0&7);
if (fw < 0)
fw = 0;
- src1[x] = fw >> 3;
- fw -= (fw>>3)<<3;
+ fw %= 8;
src2[x] = 0xff << (8-fw);
}
stepSrcWidth = sw;
@@ -471,20 +473,20 @@
setrow(uint8* row, uint32 nrows, const uint8* rows[])
{
uint32 x;
- uint32 area = nrows * filterWidth;
for (x = 0; x < tnw; x++) {
uint32 mask0 = src0[x];
uint32 fw = src1[x];
- uint32 mask1 = src1[x];
+ uint32 mask1 = src2[x];
uint32 off = rowoff[x];
uint32 acc = 0;
uint32 y, i;
for (y = 0; y < nrows; y++) {
const uint8* src = rows[y] + off;
+ uint32 _fw = fw - bits[mask0] - bits[mask1];
acc += bits[*src++ & mask0];
- switch (fw) {
+ switch (_fw) {
default:
- for (i = fw; i > 8; i--)
+ for (i = _fw; i > 8; i--)
acc += bits[*src++];
/* fall thru... */
case 8: acc += bits[*src++];
@@ -499,8 +507,9 @@
}
acc += bits[*src & mask1];
}
+ uint32 area = nrows * fw;
*row++ = cmap[(255*acc)/area];
}
}
/*