Moved engines to the new engines/ directory

svn-id: r20582

1 files changed, 95 insertions, 0 deletions

diff --git a/engines/scumm/usage_bits.cpp b/engines/scumm/usage_bits.cpp
new file mode 100644
index 0000000000..3fd90311fd
--- /dev/null
+++ b/engines/scumm/usage_bits.cpp
@@ -0,0 +1,95 @@
+/* ScummVM - Scumm Interpreter
+ * Copyright (C) 2002-2006 The ScummVM project
+ *
+ * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * $URL$
+ * $Id$
+ *
+ */
+
+#include "common/stdafx.h"
+#include "scumm/scumm.h"
+#include "scumm/usage_bits.h"
+
+namespace Scumm {
+
+void ScummEngine::upgradeGfxUsageBits() {
+	int i;
+
+	for (i = 409; i >= 0; i--) {
+		bool dirty_bit = ((gfxUsageBits[i] & 0x80000000) != 0);
+		bool restored_bit = ((gfxUsageBits[i] & 0x40000000) != 0);
+
+		gfxUsageBits[3 * i] = gfxUsageBits[i] & 0x3FFFFFFF;
+		if (dirty_bit)
+			setGfxUsageBit(i, USAGE_BIT_DIRTY);
+		if (restored_bit)
+			setGfxUsageBit(i, USAGE_BIT_RESTORED);
+	}
+}
+
+void ScummEngine::setGfxUsageBit(int strip, int bit) {
+	assert(strip >= 0 && strip < ARRAYSIZE(gfxUsageBits) / 3);
+	assert(1 <= bit && bit <= 96);
+	bit--;
+	gfxUsageBits[3 * strip + bit / 32] |= (1 << (bit % 32));
+}
+
+void ScummEngine::clearGfxUsageBit(int strip, int bit) {
+	assert(strip >= 0 && strip < ARRAYSIZE(gfxUsageBits) / 3);
+	assert(1 <= bit && bit <= 96);
+	bit--;
+	gfxUsageBits[3 * strip + bit / 32] &= ~(1 << (bit % 32));
+}
+
+bool ScummEngine::testGfxUsageBit(int strip, int bit) {
+	assert(strip >= 0 && strip < ARRAYSIZE(gfxUsageBits) / 3);
+	assert(1 <= bit && bit <= 96);
+	bit--;
+	return (gfxUsageBits[3 * strip + bit / 32] & (1 << (bit % 32))) != 0;
+}
+
+bool ScummEngine::testGfxAnyUsageBits(int strip) {
+	// Exclude the DIRTY and RESTORED bits from the test
+	uint32 bitmask[3] = { 0xFFFFFFFF, 0xFFFFFFFF, 0x3FFFFFFF };
+	int i;
+
+	assert(strip >= 0 && strip < ARRAYSIZE(gfxUsageBits) / 3);
+	for (i = 0; i < 3; i++)
+		if (gfxUsageBits[3 * strip + i] & bitmask[i])
+			return true;
+
+	return false;
+}
+
+bool ScummEngine::testGfxOtherUsageBits(int strip, int bit) {
+	// Don't exclude the DIRTY and RESTORED bits from the test
+	uint32 bitmask[3] = { 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF };
+	int i;
+
+	assert(strip >= 0 && strip < ARRAYSIZE(gfxUsageBits) / 3);
+	assert(1 <= bit && bit <= 96);
+	bit--;
+	bitmask[bit / 32] &= ~(1 << (bit % 32));
+
+	for (i = 0; i < 3; i++)
+		if (gfxUsageBits[3 * strip + i] & bitmask[i])
+			return true;
+
+	return false;
+}
+
+} // End of namespace Scumm