From 76e823c5cd0ff172cb3649655b468b920a861f06 Mon Sep 17 00:00:00 2001
From: Cyril Hrubis <metan@ucw.cz>
Date: Sun, 17 Jun 2012 19:54:12 +0200
Subject: [PATCH] filters: resize NN, fix off-by-one in coordinates mapping.

---
 libs/filters/GP_ResizeNN.gen.c.t | 15 +++++++--------
 1 file changed, 7 insertions(+), 8 deletions(-)

diff --git a/libs/filters/GP_ResizeNN.gen.c.t b/libs/filters/GP_ResizeNN.gen.c.t
index 7719efb9..7c7bd512 100644
--- a/libs/filters/GP_ResizeNN.gen.c.t
+++ b/libs/filters/GP_ResizeNN.gen.c.t
@@ -27,15 +27,14 @@ static int GP_FilterResizeNN_{{ pt.name }}_Raw(const GP_Context *src,
 		    1.00 * dst->w / src->w, 1.00 * dst->h / src->h);
 
 	/* Pre-compute mapping for interpolation */
-	uint32_t xstep = (src->w << 16) / dst->w;
-
-	for (i = 0; i < dst->w + 1; i++)
-		xmap[i] = ((i * xstep) + (1<<15)) >> 16;
-	
-	uint32_t ystep = (src->h << 16) / dst->h;
+	for (i = 0; i < dst->w; i++) {
+		xmap[i] = ((((i * (src->w - 1))<<8) + (dst->w - 1)/2) / (dst->w - 1) + (1<<7))>>8;
+		printf("%i-%i ", i, xmap[i]);
+	}
+	printf("\n%i -> %i\n", src->w, dst->w);
 
-	for (i = 0; i < dst->h + 1; i++)
-		ymap[i] = ((i * ystep) + (1<<15)) >> 16;
+	for (i = 0; i < dst->h; i++)
+		ymap[i] = ((((i * (src->h - 1))<<8) + (dst->h - 1)/2) / (dst->h - 1) + (1<<7))>>8;
 
 	/* Interpolate */
 	for (y = 0; y < (GP_Coord)dst->h; y++) {
-- 
2.11.4.GIT