mirror of
https://github.com/dborth/vbagx.git
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151 lines
4.1 KiB
C++
151 lines
4.1 KiB
C++
// VisualBoyAdvance - Nintendo Gameboy/GameboyAdvance (TM) emulator.
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// Copyright (C) 1999-2003 Forgotten
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// Copyright (C) 2004 Forgotten and the VBA development team
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2, or(at your option)
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// 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 Foundation,
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// Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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#include "System.h"
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extern int RGB_LOW_BITS_MASK;
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void Pixelate(u8 *srcPtr, u32 srcPitch, u8 *deltaPtr,
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u8 *dstPtr, u32 dstPitch, int width, int height)
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{
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u8 *nextLine, *finish;
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u32 colorMask = ~(RGB_LOW_BITS_MASK | (RGB_LOW_BITS_MASK << 16));
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nextLine = dstPtr + dstPitch;
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do {
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u32 *bP = (u32 *) srcPtr;
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u32 *xP = (u32 *) deltaPtr;
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u32 *dP = (u32 *) dstPtr;
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u32 *nL = (u32 *) nextLine;
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u32 currentPixel;
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u32 nextPixel;
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u32 currentDelta;
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u32 nextDelta;
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finish = (u8 *) bP + ((width+2) << 1);
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nextPixel = *bP++;
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nextDelta = *xP++;
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do {
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currentPixel = nextPixel;
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currentDelta = nextDelta;
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nextPixel = *bP++;
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nextDelta = *xP++;
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if ((nextPixel != nextDelta) || (currentPixel != currentDelta)) {
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u32 colorA, colorB, product;
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*(xP - 2) = currentPixel;
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#ifdef WORDS_BIGENDIAN
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colorA = currentPixel >> 16;
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colorB = currentPixel & 0xffff;
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#else
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colorA = currentPixel & 0xffff;
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colorB = currentPixel >> 16;
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#endif
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product = (((colorA & colorMask) >> 1) & colorMask) >> 1;
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#ifdef WORDS_BIGENDIAN
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*(nL) = (product << 16) | (product);
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*(dP) = (colorA << 16) | product;
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#else
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*(nL) = product | (product << 16);
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*(dP) = colorA | (product << 16);
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#endif
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#ifdef WORDS_BIGENDIAN
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colorA = nextPixel >> 16;
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#else
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colorA = nextPixel & 0xffff;
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#endif
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product = (((colorB & colorMask) >> 1) & colorMask) >> 1;
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#ifdef WORDS_BIGENDIAN
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*(nL + 1) = (product << 16) | (product);
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*(dP + 1) = (colorB << 16) | (product);
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#else
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*(nL + 1) = (product) | (product << 16);
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*(dP + 1) = (colorB) | (product << 16);
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#endif
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}
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dP += 2;
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nL += 2;
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} while ((u8 *) bP < finish);
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deltaPtr += srcPitch;
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srcPtr += srcPitch;
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dstPtr += dstPitch << 1;
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nextLine += dstPitch << 1;
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}
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while (--height);
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}
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void Pixelate32(u8 *srcPtr, u32 srcPitch, u8 * /* deltaPtr */,
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u8 *dstPtr, u32 dstPitch, int width, int height)
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{
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u8 *nextLine, *finish;
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u32 colorMask = ~RGB_LOW_BITS_MASK;
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nextLine = dstPtr + dstPitch;
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do {
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u32 *bP = (u32 *) srcPtr;
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// u32 *xP = (u32 *) deltaPtr;
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u32 *dP = (u32 *) dstPtr;
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u32 *nL = (u32 *) nextLine;
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u32 currentPixel;
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u32 nextPixel;
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finish = (u8 *) bP + ((width+1) << 2);
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nextPixel = *bP++;
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do {
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currentPixel = nextPixel;
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nextPixel = *bP++;
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u32 colorA, colorB, product;
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colorA = currentPixel;
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colorB = nextPixel;
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product = (((colorA & colorMask) >> 1) & colorMask) >> 1;
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*(nL) = product;
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*(nL+1) = product;
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*(dP) = colorA;
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*(dP+1) = product;
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nextPixel = *bP++;
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colorA = nextPixel;
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product = (((colorB & colorMask) >> 1) & colorMask) >> 1;
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*(nL + 2) = product;
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*(nL + 3) = product;
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*(dP + 2) = colorB;
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*(dP + 3) = product;
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dP += 4;
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nL += 4;
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} while ((u8 *) bP < finish);
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srcPtr += srcPitch;
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dstPtr += dstPitch << 1;
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nextLine += dstPitch << 1;
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}
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while (--height);
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}
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