From 13bd5c97b9ea5174563499e6d58bd6f77dcc8edb Mon Sep 17 00:00:00 2001
From: gbeauche <>
Date: Fri, 22 Sep 2000 17:15:27 +0000
Subject: [PATCH] - blit functions

---
 BasiliskII/src/Unix/video_blit.h | 100 +++++++++++++++++++++++++++++++
 1 file changed, 100 insertions(+)
 create mode 100644 BasiliskII/src/Unix/video_blit.h

diff --git a/BasiliskII/src/Unix/video_blit.h b/BasiliskII/src/Unix/video_blit.h
new file mode 100644
index 00000000..e9126edd
--- /dev/null
+++ b/BasiliskII/src/Unix/video_blit.h
@@ -0,0 +1,100 @@
+/*
+ *  video_blit.h - Video/graphics emulation, blitters
+ *
+ *  Basilisk II (C) 1997-2000 Christian Bauer
+ *
+ *  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.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#ifndef FB_BLIT_1
+# error "Undefined 16-bit word blit function"
+#endif
+
+#ifndef FB_BLIT_2
+# error "Undefined 32-bit word blit function"
+#endif
+
+#ifndef FB_DEPTH
+# error "Undefined screen depth"
+#endif
+
+static void FB_FUNC_NAME(uint8 * dest, const uint8 * source, uint32 length)
+{
+#if FB_DEPTH <= 8
+	// Align source and dest to 16-bit word boundaries
+	if (FB_DEPTH <= 8 && ((unsigned long) source) & 1) {
+		*dest++ = *source++;
+		length -= 1;
+	}
+#endif
+	
+	// source and dest are mutually aligned
+	uint16 * swp = ((uint16 *)source);
+	uint16 * dwp = ((uint16 *) dest );
+	
+#if FB_DEPTH <= 16
+	// Align source and dest to 32-bit word boundaries
+	if (((unsigned long) source) & 2) {
+		const uint16 val = *swp++;
+		FB_BLIT_1(*dwp++, val);
+		length -= 2;
+	}
+#endif
+	
+	// Blit 4-byte words
+	if (length >= 4) {
+		const int remainder = (length / 4) % 8;
+		uint32 * slp = (uint32 *)swp + remainder;
+		uint32 * dlp = (uint32 *)dwp + remainder;
+		
+		int n = ((length / 4) + 7) / 8;
+		switch (remainder) {
+		case 0:	do {
+				slp += 8; dlp += 8;
+				FB_BLIT_2(dlp[-8], slp[-8]);
+		case 7: FB_BLIT_2(dlp[-7], slp[-7]);
+		case 6: FB_BLIT_2(dlp[-6], slp[-6]);
+		case 5: FB_BLIT_2(dlp[-5], slp[-5]);
+		case 4: FB_BLIT_2(dlp[-4], slp[-4]);
+		case 3: FB_BLIT_2(dlp[-3], slp[-3]);
+		case 2: FB_BLIT_2(dlp[-2], slp[-2]);
+		case 1: FB_BLIT_2(dlp[-1], slp[-1]);
+				} while (--n > 0);
+		}
+	}
+	
+#if FB_DEPTH <= 16
+	// There might remain one word to blit
+	if (length & 2) {
+		uint16 * const s = (uint16 *)(((uint8 *)swp) + length - 2);
+		uint16 * const d = (uint16 *)(((uint8 *)dwp) + length - 2);
+		FB_BLIT_1(*d, *s);
+	}
+#endif
+}
+
+#undef FB_FUNC_NAME
+
+#ifdef FB_BLIT_1
+#undef FB_BLIT_1
+#endif
+
+#ifdef FB_BLIT_2
+#undef FB_BLIT_2
+#endif
+
+#ifdef FB_DEPTH
+#undef FB_DEPTH
+#endif