X-Git-Url: http://git.mutantstargoat.com/user/nuclear/?a=blobdiff_plain;f=src%2Fgfxutil.c;h=b82a612089960b8fbb5fa3fec3ebca5c2183af6f;hb=8cee0ffb00cce3d81487f1161286ac299db7d044;hp=0257f79be2009350d97689f3b64bad0947c63b49;hpb=757e7697c9a4434df6f3fdf3234de504bb4636bc;p=dosdemo

diff --git a/src/gfxutil.c b/src/gfxutil.c
index 0257f79..b82a612 100644
--- a/src/gfxutil.c
+++ b/src/gfxutil.c
@@ -142,3 +142,63 @@ void draw_line(int x0, int y0, int x1, int y1, unsigned short color)
 		}
 	}
 }
+
+
+#define BLUR(w, h, pstep, sstep) \
+	for(i=0; i<h; i++) { \
+		int sum = sptr[0] * (rad + 1); \
+		int count = (rad * 2 + 1) << 8; \
+		int midsize = w - rad * 2; \
+		int firstpix = sptr[0]; \
+		int lastpix = sptr[pstep * (w - 1)]; \
+		/* add up the contributions for the -1 pixel */ \
+		for(j=0; j<rad; j++) { \
+			sum += sptr[pstep * j]; \
+		} \
+		/* first part adding sptr[rad] and subtracting sptr[0] */ \
+		for(j=0; j<=rad; j++) { \
+			sum += (int)sptr[pstep * rad] - firstpix; \
+			sptr += pstep; \
+			*dptr = scale * sum / count; \
+			dptr += pstep; \
+		} \
+		/* middle part adding sptr[rad] and subtracting sptr[-(rad+1)] */ \
+		for(j=1; j<midsize; j++) { \
+			sum += (int)sptr[pstep * rad] - (int)sptr[-(rad + 1) * pstep]; \
+			sptr += pstep; \
+			*dptr = scale * sum / count; \
+			dptr += pstep; \
+		} \
+		/* last part adding lastpix and subtracting sptr[-(rad+1)] */ \
+		for(j=0; j<rad; j++) { \
+			sum += lastpix - (int)sptr[-(rad + 1) * pstep]; \
+			sptr += pstep; \
+			*dptr = scale * sum / count; \
+			dptr += pstep; \
+		} \
+		sptr += sstep; \
+		dptr += sstep; \
+	}
+
+/* TODO bound blur rad to image size to avoid inner loop conditionals */
+/* TODO make version with pow2 (rad*2+1) to avoid div with count everywhere */
+void blur_grey_horiz(uint16_t *dest, uint16_t *src, int xsz, int ysz, int rad, int scale)
+{
+	int i, j;
+	unsigned char *dptr = (unsigned char*)dest;
+	unsigned char *sptr = (unsigned char*)src;
+
+	BLUR(xsz, ysz, 2, 0);
+}
+
+
+void blur_grey_vert(uint16_t *dest, uint16_t *src, int xsz, int ysz, int rad, int scale)
+{
+	int i, j;
+	unsigned char *dptr = (unsigned char*)dest;
+	unsigned char *sptr = (unsigned char*)src;
+	int pixel_step = xsz * 2;
+	int scanline_step = 2 - ysz * pixel_step;
+
+	BLUR(ysz, xsz, pixel_step, scanline_step);
+}