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