first Horizontal Blur for 32

libImaging/BoxBlur.c

@@ -2,7 +2,53 @@
 #include "Imaging.h"
 
 
-Imaging ImagingBoxBlur(Imaging im, Imaging imOut, int radius)
+Imaging
+HorizontalBoxBlur32(Imaging im, Imaging imOut, int radius)
 {
+    ImagingSectionCookie cookie;
+
+    int x, y, pix, offset;
+    int acc[4];
+
+    typedef UINT8 pixel[4];
+    pixel *line;
+
+    int window = radius * 2 + 1;
+
+    ImagingSectionEnter(&cookie);
+
+    for (y = 0; y < im->ysize; y++) {
+        line = (pixel *) im->image32[y];
+        for (x = 0; x < im->xsize; x++) {
+            acc[0] = acc[1] = acc[2] = acc[3] = 0;
+            for (pix = x - radius; pix <= x + radius; pix++) {
+                offset = pix;
+                if (pix < 0) {
+                    offset = 0;
+                } else if (pix >= im->xsize) {
+                    offset = im->xsize - 1;
+                }
+                acc[0] += line[offset][0];
+                acc[1] += line[offset][1];
+                acc[2] += line[offset][2];
+                acc[3] += line[offset][3];
+            }
+
+            imOut->image32[y][x] =
+                (UINT8)(acc[0] / window) | (UINT8)(acc[1] / window) << 8 |
+                (UINT8)(acc[2] / window) << 16 | (UINT8)(acc[3] / window) << 24;
+        }
+    }
+
+    ImagingSectionLeave(&cookie);
+
+    return imOut;
+}
+
+
+Imaging
+ImagingBoxBlur(Imaging im, Imaging imOut, int radius)
+{
+    HorizontalBoxBlur32(im, imOut, radius);
     return imOut;
 }