X-Git-Url: https://git.gag.com/?p=fw%2Faltos;a=blobdiff_plain;f=src%2Fdraw%2Fao_pattern.c;fp=src%2Fdraw%2Fao_pattern.c;h=0d1dc7652b719893d627f26cdb8df0a86187123f;hp=0000000000000000000000000000000000000000;hb=1301d576d9bface4cc625e4a4187401f93f54444;hpb=a487d2fcba57141f6b083d5612c76bac5ad1ac7c

diff --git a/src/draw/ao_pattern.c b/src/draw/ao_pattern.c
new file mode 100644
index 00000000..0d1dc765
--- /dev/null
+++ b/src/draw/ao_pattern.c
@@ -0,0 +1,80 @@
+/*
+ * Copyright © 2016 Keith Packard <keithp@keithp.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ */
+
+#include "ao.h"
+#include "ao_draw.h"
+#include "ao_draw_int.h"
+
+static inline uint32_t
+ao_pattern_expand(uint8_t v, uint8_t rot)
+{
+	uint32_t	r;
+
+	if (rot)
+		v = ao_left(v, 8-rot) | ao_right(v, rot);
+	r = v;
+	return (r << 24) | (r << 16) | (r << 8) | (r);
+}
+
+static inline int
+min(int a, int b) {
+	return a < b ? a : b;
+}
+
+void
+ao_pattern(const struct ao_bitmap	*dst,
+	   int16_t			x,
+	   int16_t			y,
+	   int16_t			width,
+	   int16_t			height,
+	   const struct ao_pattern	*pattern,
+	   int16_t			pat_x,
+	   int16_t			pat_y,
+	   uint8_t			rop)
+{
+	uint32_t	pat[8];
+
+	int16_t	x2 = x + width;
+	int16_t y2 = y + height;
+
+	ao_clip(x, 0, dst->width);
+	ao_clip(x2, 0, dst->width);
+	ao_clip(y, 0, dst->height);
+	ao_clip(y2, 0, dst->height);
+
+	if (x < x2 && y < y2) {
+		int	xrot = (x - pat_x) & 7;
+		int	yrot = (y - pat_y) & 7;
+		int	i;
+		int16_t	dst_x, dst_y;
+
+		for (i = 0; i < 8; i++)
+			pat[(i + yrot) & 7] = ao_pattern_expand(pattern->pattern[i], xrot);
+		for (dst_y = y; dst_y < y2; dst_y += 8) {
+			int	h = min(y2 - dst_y, 8);
+			for (dst_x = x; dst_x < x2; dst_x += 8) {
+				int	w = min(x2 - dst_x, 8);
+
+				ao_blt(pat, 1, 0,
+				       dst->base + dst_y * dst->stride,
+				       dst->stride,
+				       dst_x,
+				       w, h,
+				       rop,
+				       0, 0);
+			}
+		}
+	}
+}
+