scaler.cpp

/* REminiscence - Flashback interpreter
 * Copyright (C) 2005-2007 Gregory Montoir
 *
 * 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.
 */

#include "scaler.h"


const Scaler _scalers[] = {
	{ "point1x", &point1x, 1 },
	{ "point2x", &point2x, 2 },
	{ "scale2x", &scale2x, 2 },
	{ "point3x", &point3x, 3 },
	{ "scale3x", &scale3x, 3 }
};

void point1x(uint16 *dst, uint16 dstPitch, const uint16 *src, uint16 srcPitch, uint16 w, uint16 h) {
	dstPitch >>= 1;
	while (h--) {
		memcpy(dst, src, w * 2);
		dst += dstPitch;
		src += srcPitch;
	}
}
/*
// Scaler function which scales by 0.5
void Scaleo5x(const uint8 *srcPtr, uint32 srcPitch, uint8 *dstPtr, uint32 dstPitch, int width, int height) {
      dstPitch >>= 1; srcPitch >>= 1;
      const int tgtHeight = height >> 1;
      const int tgtWidth = width >> 1;
      uint16 dstColor;
      for(int i=0;i<tgtHeight; i++) {
              uint16 *srcRow = (uint16*)srcPtr + (i << 1)*srcPitch;
              uint16 *srcRow2 = (uint16*)srcPtr + ((i << 1)+1)*srcPitch;
              uint16 *dstRow = (uint16*)dstPtr + i*dstPitch;
              for(int j=0;j<tgtWidth; j++) {
                      int srcx = j << 1;
                      dstColor = (*(srcRow + srcx) & 0xE79C) >> 2;
                      dstColor += (*(srcRow + srcx+1) & 0xE79C) >> 2;
                      dstColor += (*(srcRow2 + srcx) & 0xE79C) >> 2;
                      dstColor += (*(srcRow + srcx+1) & 0xE79C) >> 2;
                      *(dstRow + j) = dstColor;
              }
      }
}
*/
void point2x(uint16 *dst, uint16 dstPitch, const uint16 *src, uint16 srcPitch, uint16 w, uint16 h) {
	dstPitch >>= 1;
	while (h--) {
		uint16 *p = dst;
		for (int i = 0; i < w; ++i, p += 2) {
			uint16 c = *(src + i);
			*(p) = c;
			*(p + 1) = c;
			*(p + dstPitch) = c;
			*(p + dstPitch + 1) = c;
		}
		dst += dstPitch * 2;
		src += srcPitch;
	}
}

void point3x(uint16 *dst, uint16 dstPitch, const uint16 *src, uint16 srcPitch, uint16 w, uint16 h) {
	dstPitch >>= 1;
	while (h--) {
		uint16 *p = dst;
		for (int i = 0; i < w; ++i, p += 3) {
			uint16 c = *(src + i);
			*(p) = c;
			*(p + 1) = c;
			*(p + 2) = c;
			*(p + dstPitch) = c;
			*(p + dstPitch + 1) = c;
			*(p + dstPitch + 2) = c;
			*(p + 2 * dstPitch) = c;
			*(p + 2 * dstPitch + 1) = c;
			*(p + 2 * dstPitch + 2) = c;
		}
		dst += dstPitch * 3;
		src += srcPitch;
	}
}

void scale2x(uint16 *dst, uint16 dstPitch, const uint16 *src, uint16 srcPitch, uint16 w, uint16 h) {
	dstPitch >>= 1;
	while (h--) {
		uint16 *p = dst;
		for (int i = 0; i < w; ++i, p += 2) {
			uint16 B = *(src + i - srcPitch);
			uint16 D = *(src + i - 1);
			uint16 E = *(src + i);
			uint16 F = *(src + i + 1);
			uint16 H = *(src + i + srcPitch);
			if (B != H && D != F) {
				*(p) = D == B ? D : E;
				*(p + 1) = B == F ? F : E;
				*(p + dstPitch) = D == H ? D : E;
				*(p + dstPitch + 1) = H == F ? F : E;
			} else {
				*(p) = E;
				*(p + 1) = E;
				*(p + dstPitch) = E;
				*(p + dstPitch + 1) = E;
			}
		}
		dst += dstPitch * 2;
		src += srcPitch;
	}
}

void scale3x(uint16 *dst, uint16 dstPitch, const uint16 *src, uint16 srcPitch, uint16 w, uint16 h) {
	dstPitch >>= 1;
	while (h--) {
		uint16 *p = dst;
		for (int i = 0; i < w; ++i, p += 3) {
			uint16 A = *(src + i - srcPitch - 1);
			uint16 B = *(src + i - srcPitch);
			uint16 C = *(src + i - srcPitch + 1);
			uint16 D = *(src + i - 1);
			uint16 E = *(src + i);
			uint16 F = *(src + i + 1);
			uint16 G = *(src + i + srcPitch - 1);
			uint16 H = *(src + i + srcPitch);
			uint16 I = *(src + i + srcPitch + 1);
			if (B != H && D != F) {
				*(p) = D == B ? D : E;
				*(p + 1) = (D == B && E != C) || (B == F && E != A) ? B : E;
				*(p + 2) = B == F ? F : E;
				*(p + dstPitch) = (D == B && E != G) || (D == B && E != A) ? D : E;
				*(p + dstPitch + 1) = E;
				*(p + dstPitch + 2) = (B == F && E != I) || (H == F && E != C) ? F : E;
				*(p + 2 * dstPitch) = D == H ? D : E;
				*(p + 2 * dstPitch + 1) = (D == H && E != I) || (H == F && E != G) ? H : E;
				*(p + 2 * dstPitch + 2) = H == F ? F : E;
			} else {
				*(p) = E;
				*(p + 1) = E;
				*(p + 2) = E;
				*(p + dstPitch) = E;
				*(p + dstPitch + 1) = E;
				*(p + dstPitch + 2) = E;
				*(p + 2 * dstPitch) = E;
				*(p + 2 * dstPitch + 1) = E;
				*(p + 2 * dstPitch + 2) = E;
			}
		}
		dst += dstPitch * 3;
		src += srcPitch;
	}
}