yaft ( http://uobikiemukot.github.io/yaft/ ) on OpenBSD/luna88k, sixel drawing diff.

yaft-luna88k-8bpp-sixel-20140812.diff

diff --git a/draw.h b/draw.h
index 9871ba3..ad594f8 100644
--- a/draw.h
+++ b/draw.h
@@ -3,29 +3,68 @@ static inline void draw_sixel(struct framebuffer *fb, int line, int col, uint8_t
 {
 	int h, w, src_offset, dst_offset;
 	uint32_t pixel, color = 0;
+	int x, y, i;
+	uint32_t *p0, *p;
 
 	for (h = 0; h < CELL_HEIGHT; h++) {
 		for (w = 0; w < CELL_WIDTH; w++) {
 			src_offset = BYTES_PER_PIXEL * (h * CELL_WIDTH + w);
 			memcpy(&color, bitmap + src_offset, BYTES_PER_PIXEL);
 
+#if 0
 			dst_offset = (line * CELL_HEIGHT + h) * fb->line_length + (col * CELL_WIDTH + w) * fb->bytes_per_pixel;
 			pixel = color2pixel(&fb->vinfo, color);
 			memcpy(fb->buf + dst_offset, &pixel, fb->bytes_per_pixel);
+#else
+			pixel = color2pixel(&fb->vinfo, color);
+
+			x = CELL_WIDTH * col + w;
+			y = CELL_HEIGHT * line + h;
+			p0 = (uint32_t *)((uint8_t *)fb->buf
+				+ y * fb->line_length + ((x / 32) * 4));
+			x %= 32;
+
+			for (i = 0; i < DEPTH; i++) {
+				p = (uint32_t *)((uint8_t *)p0 + 0x40000 * i);
+				if (pixel & (0x01 << i))
+					/* set */
+					*p |= (0x00000001 << (31 - x));
+				else
+					/* reset */
+					*p &= ~(0x00000001 << (31 - x));
+			}
+#endif
 		}
 	}
 }