mirror of
https://github.com/libretro/scummvm.git
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90 lines
2.4 KiB
C++
90 lines
2.4 KiB
C++
/* ScummVM - Scumm Interpreter
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* Copyright (C) 2002-2005 The ScummVM project
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* $Header$
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*
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*/
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#include "stdafx.h"
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#include "scumm/scumm.h"
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#include "scumm/usage_bits.h"
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namespace Scumm {
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void ScummEngine::upgradeGfxUsageBits() {
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int i;
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for (i = 409; i >= 0; i--) {
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bool dirty_bit = ((gfxUsageBits[i] & 0x80000000) != 0);
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bool restored_bit = ((gfxUsageBits[i] & 0x40000000) != 0);
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gfxUsageBits[3 * i] = gfxUsageBits[i] & 0x3FFFFFFF;
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if (dirty_bit)
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setGfxUsageBit(i, USAGE_BIT_DIRTY);
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if (restored_bit)
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setGfxUsageBit(i, USAGE_BIT_RESTORED);
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}
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}
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void ScummEngine::setGfxUsageBit(int strip, int bit) {
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assert(1 <= bit && bit <= 96);
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bit--;
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gfxUsageBits[3 * strip + bit / 32] |= (1 << (bit % 32));
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}
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void ScummEngine::clearGfxUsageBit(int strip, int bit) {
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assert(1 <= bit && bit <= 96);
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bit--;
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gfxUsageBits[3 * strip + bit / 32] &= ~(1 << (bit % 32));
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}
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bool ScummEngine::testGfxUsageBit(int strip, int bit) {
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assert(1 <= bit && bit <= 96);
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bit--;
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return (gfxUsageBits[3 * strip + bit / 32] & (1 << (bit % 32))) != 0;
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}
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bool ScummEngine::testGfxAnyUsageBits(int strip) {
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// Exclude the DIRTY and RESTORED bits from the test
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uint32 bitmask[3] = { 0xFFFFFFFF, 0xFFFFFFFF, 0x3FFFFFFF };
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int i;
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for (i = 0; i < 3; i++)
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if (gfxUsageBits[3 * strip + i] & bitmask[i])
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return true;
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return false;
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}
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bool ScummEngine::testGfxOtherUsageBits(int strip, int bit) {
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// Don't exclude the DIRTY and RESTORED bits from the test
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uint32 bitmask[3] = { 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF };
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int i;
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assert(1 <= bit && bit <= 96);
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bit--;
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bitmask[bit / 32] &= ~(1 << (bit % 32));
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for (i = 0; i < 3; i++)
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if (gfxUsageBits[3 * strip + i] & bitmask[i])
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return true;
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return false;
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}
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} // End of namespace Scumm
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