From ed53573c4611d24e345477f8af457417c61759b0 Mon Sep 17 00:00:00 2001
From: Tor Andersson <tor@ghostscript.com>
Date: Wed, 8 Apr 2009 13:16:43 +0200
Subject: Use a slower but correct division in image bit depth
scaling/clamping.
---
mupdf/pdf_image.c | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)
diff --git a/mupdf/pdf_image.c b/mupdf/pdf_image.c
index 71f14e39..15984551 100644
--- a/mupdf/pdf_image.c
+++ b/mupdf/pdf_image.c
@@ -541,7 +541,7 @@ pdf_loadtile(fz_image *img, fz_pixmap *tile)
{
fz_pixmap *tmp;
int x, y, k, i;
- int invbpcfact = 1<<16;
+ int bpcfact = 1<<16;
error = fz_newpixmap(&tmp, tile->x, tile->y, tile->w, tile->h, 1);
if (error)
@@ -549,10 +549,10 @@ pdf_loadtile(fz_image *img, fz_pixmap *tile)
switch (src->bpc)
{
- case 1: invbpcfact = (1<<16) / 255; break;
- case 2: invbpcfact = (1<<16) / 85; break;
- case 4: invbpcfact = (1<<16) / 17; break;
- case 8: invbpcfact = (1<<16) / 1; break;
+ case 1: bpcfact = 255; break;
+ case 2: bpcfact = 85; break;
+ case 4: bpcfact = 17; break;
+ case 8: bpcfact = 1; break;
}
tilefunc(src->samples->rp + (tile->y * src->stride), src->stride,
@@ -570,7 +570,7 @@ pdf_loadtile(fz_image *img, fz_pixmap *tile)
for (x = 0; x < tile->w; x++)
{
dst[x * dn] = 255; /* alpha */
- i = st[x] * invbpcfact >> 16;
+ i = st[x] / bpcfact;
i = CLAMP(i, 0, high);
for (k = 0; k < sn; k++)
{
--
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