Revision: 56487
http://sourceforge.net/p/brlcad/code/56487
Author: mohitdaga
Date: 2013-08-02 18:12:06 +0000 (Fri, 02 Aug 2013)
Log Message:
-----------
Improve Box Average method in shrink function
Modified Paths:
--------------
brlcad/trunk/src/util/pixshrink.c
Modified: brlcad/trunk/src/util/pixshrink.c
===================================================================
--- brlcad/trunk/src/util/pixshrink.c 2013-08-02 18:04:18 UTC (rev 56486)
+++ brlcad/trunk/src/util/pixshrink.c 2013-08-02 18:12:06 UTC (rev 56487)
@@ -99,13 +99,14 @@
void
shrink_image(int scanlen, int Width, int Height, unsigned char *buffer, int
Factor)
{
- UCHAR *pixelp, *finalpixel;
+ UCHAR *pixelp, *out_buf;
unsigned int p[3];
int facsq, x, y, px, py;
facsq = Factor * Factor;
- finalpixel = buffer;
+ out_buf = buffer;
+
for (y=0; y < Height; y += Factor)
for (x=0; x < Width; x += Factor) {
@@ -117,8 +118,8 @@
for (py = 0; py < Factor; py++) {
/* get first pixel in scanline */
- pixelp = &buffer[y*scanlen+x*3];
-
+ pixelp = &buffer[(y+py)*scanlen+x*3];
+
/* add pixels from scanline to average */
for (px = 0; px < Factor; px++) {
p[0] += *pixelp++;
@@ -128,8 +129,9 @@
}
/* store resultant pixel back in buffer */
- for (py = 0; py < 3; ++py)
- *finalpixel++ = p[py] / facsq;
+ for (py = 0; py < 3; ++py)
+ *out_buf++ = p[py] / facsq;
+
}
}
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