mirror of
https://github.com/libretro/scummvm.git
synced 2024-12-27 04:07:05 +00:00
90 lines
2.4 KiB
C++
90 lines
2.4 KiB
C++
/* ScummVM - Scumm Interpreter
|
|
* Copyright (C) 2002-2004 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
|
|
*
|
|
* $Header$
|
|
*
|
|
*/
|
|
|
|
#include "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(1 <= bit && bit <= 96);
|
|
bit--;
|
|
gfxUsageBits[3 * strip + bit / 32] |= (1 << (bit % 32));
|
|
}
|
|
|
|
void ScummEngine::clearGfxUsageBit(int strip, int bit) {
|
|
assert(1 <= bit && bit <= 96);
|
|
bit--;
|
|
gfxUsageBits[3 * strip + bit / 32] &= ~(1 << (bit % 32));
|
|
}
|
|
|
|
bool ScummEngine::testGfxUsageBit(int strip, int bit) {
|
|
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;
|
|
|
|
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(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
|