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2xsai.cpp

/* ScummVM - Scumm Interpreter
 * Copyright (C) 2001  Ludvig Strigeus
 * Copyright (C) 2001-2004 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: /cvsroot/scummvm/scummvm/common/scaler/2xsai.cpp,v 1.7 2004/03/13 15:45:39 fingolfin Exp $
 *
 */

#include "common/scaler/intern.h"



static inline int GetResult(uint32 A, uint32 B, uint32 C, uint32 D) { 
      const bool ac = (A==C);
      const bool bc = (B==C);
      const int x1 = ac;
      const int y1 = (bc & !ac);
      const bool ad = (A==D);
      const bool bd = (B==D);
      const int x2 = ad;
      const int y2 = (bd & !ad);
      const int x = x1+x2;
      const int y = y1+y2;
      static const int rmap[3][3] = {
                  {0, 0, -1},
                  {0, 0, -1},
                  {1, 1,  0}
            };
      return rmap[y][x];
}

#define INTERPOLATE           INTERPOLATE<bitFormat>
#define Q_INTERPOLATE   Q_INTERPOLATE<bitFormat>

template<int bitFormat>
void Super2xSaITemplate(const uint8 *srcPtr, uint32 srcPitch, uint8 *dstPtr, uint32 dstPitch, int width, int height) {
      const uint16 *bP;
      uint16 *dP;
      const uint32 nextlineSrc = srcPitch >> 1;
      
      while (height--) {
            bP = (const uint16 *)srcPtr;
            dP = (uint16 *)dstPtr;

            for (int i = 0; i < width; ++i) {
                  uint32 color4, color5, color6;
                  uint32 color1, color2, color3;
                  uint32 colorA0, colorA1, colorA2, colorA3;
                  uint32 colorB0, colorB1, colorB2, colorB3;
                  uint32 colorS1, colorS2;
                  uint32 product1a, product1b, product2a, product2b;

//---------------------------------------    B1 B2
//                                         4  5  6 S2
//                                         1  2  3 S1
//                                           A1 A2

                  colorB0 = *(bP - nextlineSrc - 1);
                  colorB1 = *(bP - nextlineSrc);
                  colorB2 = *(bP - nextlineSrc + 1);
                  colorB3 = *(bP - nextlineSrc + 2);

                  color4 = *(bP - 1);
                  color5 = *(bP);
                  color6 = *(bP + 1);
                  colorS2 = *(bP + 2);

                  color1 = *(bP + nextlineSrc - 1);
                  color2 = *(bP + nextlineSrc);
                  color3 = *(bP + nextlineSrc + 1);
                  colorS1 = *(bP + nextlineSrc + 2);

                  colorA0 = *(bP + 2 * nextlineSrc - 1);
                  colorA1 = *(bP + 2 * nextlineSrc);
                  colorA2 = *(bP + 2 * nextlineSrc + 1);
                  colorA3 = *(bP + 2 * nextlineSrc + 2);

//--------------------------------------
                  if (color2 == color6 && color5 != color3) {
                        product2b = product1b = color2;
                  } else if (color5 == color3 && color2 != color6) {
                        product2b = product1b = color5;
                  } else if (color5 == color3 && color2 == color6) {
                        register int r = 0;

                        r += GetResult(color6, color5, color1, colorA1);
                        r += GetResult(color6, color5, color4, colorB1);
                        r += GetResult(color6, color5, colorA2, colorS1);
                        r += GetResult(color6, color5, colorB2, colorS2);

                        if (r > 0)
                              product2b = product1b = color6;
                        else if (r < 0)
                              product2b = product1b = color5;
                        else {
                              product2b = product1b = INTERPOLATE(color5, color6);
                        }
                  } else {
                        if (color6 == color3 && color3 == colorA1 && color2 != colorA2 && color3 != colorA0)
                              product2b = Q_INTERPOLATE(color3, color3, color3, color2);
                        else if (color5 == color2 && color2 == colorA2 && colorA1 != color3 && color2 != colorA3)
                              product2b = Q_INTERPOLATE(color2, color2, color2, color3);
                        else
                              product2b = INTERPOLATE(color2, color3);

                        if (color6 == color3 && color6 == colorB1 && color5 != colorB2 && color6 != colorB0)
                              product1b = Q_INTERPOLATE(color6, color6, color6, color5);
                        else if (color5 == color2 && color5 == colorB2 && colorB1 != color6 && color5 != colorB3)
                              product1b = Q_INTERPOLATE(color6, color5, color5, color5);
                        else
                              product1b = INTERPOLATE(color5, color6);
                  }

                  if (color5 == color3 && color2 != color6 && color4 == color5 && color5 != colorA2)
                        product2a = INTERPOLATE(color2, color5);
                  else if (color5 == color1 && color6 == color5 && color4 != color2 && color5 != colorA0)
                        product2a = INTERPOLATE(color2, color5);
                  else
                        product2a = color2;

                  if (color2 == color6 && color5 != color3 && color1 == color2 && color2 != colorB2)
                        product1a = INTERPOLATE(color2, color5);
                  else if (color4 == color2 && color3 == color2 && color1 != color5 && color2 != colorB0)
                        product1a = INTERPOLATE(color2, color5);
                  else
                        product1a = color5;

                  *(dP + 0) = (uint16) product1a;
                  *(dP + 1) = (uint16) product1b;
                  *(dP + dstPitch/2 + 0) = (uint16) product2a;
                  *(dP + dstPitch/2 + 1) = (uint16) product2b;

                  bP += 1;
                  dP += 2;
            }

            srcPtr += srcPitch;
            dstPtr += dstPitch * 2;
      }
}

MAKE_WRAPPER(Super2xSaI)

template<int bitFormat>
void SuperEagleTemplate(const uint8 *srcPtr, uint32 srcPitch, uint8 *dstPtr, uint32 dstPitch, int width, int height) {
      const uint16 *bP;
      uint16 *dP;
      const uint32 nextlineSrc = srcPitch >> 1;

      while (height--) {
            bP = (const uint16 *)srcPtr;
            dP = (uint16 *)dstPtr;
            for (int i = 0; i < width; ++i) {
                  uint32 color4, color5, color6;
                  uint32 color1, color2, color3;
                  uint32 colorA1, colorA2, colorB1, colorB2, colorS1, colorS2;
                  uint32 product1a, product1b, product2a, product2b;

                  colorB1 = *(bP - nextlineSrc);
                  colorB2 = *(bP - nextlineSrc + 1);

                  color4 = *(bP - 1);
                  color5 = *(bP);
                  color6 = *(bP + 1);
                  colorS2 = *(bP + 2);

                  color1 = *(bP + nextlineSrc - 1);
                  color2 = *(bP + nextlineSrc);
                  color3 = *(bP + nextlineSrc + 1);
                  colorS1 = *(bP + nextlineSrc + 2);

                  colorA1 = *(bP + 2 * nextlineSrc);
                  colorA2 = *(bP + 2 * nextlineSrc + 1);

                  // --------------------------------------
                  if (color5 != color3) {
                        if (color2 == color6) {
                              product1b = product2a = color2;
                              if ((color1 == color2) || (color6 == colorB2)) {
                                    product1a = INTERPOLATE(color2, color5);
                                    product1a = INTERPOLATE(color2, product1a);
                              } else {
                                    product1a = INTERPOLATE(color5, color6);
                              }

                              if ((color6 == colorS2) || (color2 == colorA1)) {
                                    product2b = INTERPOLATE(color2, color3);
                                    product2b = INTERPOLATE(color2, product2b);
                              } else {
                                    product2b = INTERPOLATE(color2, color3);
                              }
                        } else {
                              product2b = product1a = INTERPOLATE(color2, color6);
                              product2b = Q_INTERPOLATE(color3, color3, color3, product2b);
                              product1a = Q_INTERPOLATE(color5, color5, color5, product1a);

                              product2a = product1b = INTERPOLATE(color5, color3);
                              product2a = Q_INTERPOLATE(color2, color2, color2, product2a);
                              product1b = Q_INTERPOLATE(color6, color6, color6, product1b);
                        }
                  } else {
                        if (color2 != color6) {
                              product2b = product1a = color5;

                              if ((colorB1 == color5) || (color3 == colorS1)) {
                                    product1b = INTERPOLATE(color5, color6);
                                    product1b = INTERPOLATE(color5, product1b);
                              } else {
                                    product1b = INTERPOLATE(color5, color6);
                              }

                              if ((color3 == colorA2) || (color4 == color5)) {
                                    product2a = INTERPOLATE(color5, color2);
                                    product2a = INTERPOLATE(color5, product2a);
                              } else {
                                    product2a = INTERPOLATE(color2, color3);
                              }
                        } else {
                              register int r = 0;

                              r += GetResult(color6, color5, color1, colorA1);
                              r += GetResult(color6, color5, color4, colorB1);
                              r += GetResult(color6, color5, colorA2, colorS1);
                              r += GetResult(color6, color5, colorB2, colorS2);

                              if (r > 0) {
                                    product1b = product2a = color2;
                                    product1a = product2b = INTERPOLATE(color5, color6);
                              } else if (r < 0) {
                                    product2b = product1a = color5;
                                    product1b = product2a = INTERPOLATE(color5, color6);
                              } else {
                                    product2b = product1a = color5;
                                    product1b = product2a = color2;
                              }
                        }
                  }

                  *(dP + 0) = (uint16) product1a;
                  *(dP + 1) = (uint16) product1b;
                  *(dP + dstPitch/2 + 0) = (uint16) product2a;
                  *(dP + dstPitch/2 + 1) = (uint16) product2b;

                  bP += 1;
                  dP += 2;
            }

            srcPtr += srcPitch;
            dstPtr += dstPitch * 2;
      }
}

MAKE_WRAPPER(SuperEagle)

template<int bitFormat>
void _2xSaITemplate(const uint8 *srcPtr, uint32 srcPitch, uint8 *dstPtr, uint32 dstPitch, int width, int height) {
      const uint16 *bP;
      uint16 *dP;
      const uint32 nextlineSrc = srcPitch >> 1;

      while (height--) {
            bP = (const uint16 *)srcPtr;
            dP = (uint16 *)dstPtr;

            for (int i = 0; i < width; ++i) {

                  register uint32 colorA, colorB;
                  uint32 colorC, colorD,
                        colorE, colorF, colorG, colorH, colorI, colorJ, colorK, colorL, colorM, colorN, colorO, colorP;
                  uint32 product, product1, product2;

//---------------------------------------
// Map of the pixels:                    I|E F|J
//                                       G|A B|K
//                                       H|C D|L
//                                       M|N O|P
                  colorI = *(bP - nextlineSrc - 1);
                  colorE = *(bP - nextlineSrc);
                  colorF = *(bP - nextlineSrc + 1);
                  colorJ = *(bP - nextlineSrc + 2);

                  colorG = *(bP - 1);
                  colorA = *(bP);
                  colorB = *(bP + 1);
                  colorK = *(bP + 2);

                  colorH = *(bP + nextlineSrc - 1);
                  colorC = *(bP + nextlineSrc);
                  colorD = *(bP + nextlineSrc + 1);
                  colorL = *(bP + nextlineSrc + 2);

                  colorM = *(bP + 2 * nextlineSrc - 1);
                  colorN = *(bP + 2 * nextlineSrc);
                  colorO = *(bP + 2 * nextlineSrc + 1);
                  colorP = *(bP + 2 * nextlineSrc + 2);

                  if ((colorA == colorD) && (colorB != colorC)) {
                        if (((colorA == colorE) && (colorB == colorL)) ||
                              ((colorA == colorC) && (colorA == colorF) && (colorB != colorE) && (colorB == colorJ))) {
                              product = colorA;
                        } else {
                              product = INTERPOLATE(colorA, colorB);
                        }

                        if (((colorA == colorG) && (colorC == colorO)) ||
                              ((colorA == colorB) && (colorA == colorH) && (colorG != colorC)  && (colorC == colorM))) {
                              product1 = colorA;
                        } else {
                              product1 = INTERPOLATE(colorA, colorC);
                        }
                        product2 = colorA;
                  } else if ((colorB == colorC) && (colorA != colorD)) {
                        if (((colorB == colorF) && (colorA == colorH)) ||
                              ((colorB == colorE) && (colorB == colorD) && (colorA != colorF) && (colorA == colorI))) {
                              product = colorB;
                        } else {
                              product = INTERPOLATE(colorA, colorB);
                        }

                        if (((colorC == colorH) && (colorA == colorF)) ||
                              ((colorC == colorG) && (colorC == colorD) && (colorA != colorH) && (colorA == colorI))) {
                              product1 = colorC;
                        } else {
                              product1 = INTERPOLATE(colorA, colorC);
                        }
                        product2 = colorB;
                  } else if ((colorA == colorD) && (colorB == colorC)) {
                        if (colorA == colorB) {
                              product = colorA;
                              product1 = colorA;
                              product2 = colorA;
                        } else {
                              register int r = 0;

                              product1 = INTERPOLATE(colorA, colorC);
                              product = INTERPOLATE(colorA, colorB);

                              r += GetResult(colorA, colorB, colorG, colorE);
                              r -= GetResult(colorB, colorA, colorK, colorF);
                              r -= GetResult(colorB, colorA, colorH, colorN);
                              r += GetResult(colorA, colorB, colorL, colorO);

                              if (r > 0)
                                    product2 = colorA;
                              else if (r < 0)
                                    product2 = colorB;
                              else {
                                    product2 = Q_INTERPOLATE(colorA, colorB, colorC, colorD);
                              }
                        }
                  } else {
                        product2 = Q_INTERPOLATE(colorA, colorB, colorC, colorD);

                        if ((colorA == colorC) && (colorA == colorF)
                                    && (colorB != colorE) && (colorB == colorJ)) {
                              product = colorA;
                        } else if ((colorB == colorE) && (colorB == colorD)
                                                       && (colorA != colorF) && (colorA == colorI)) {
                              product = colorB;
                        } else {
                              product = INTERPOLATE(colorA, colorB);
                        }

                        if ((colorA == colorB) && (colorA == colorH)
                                    && (colorG != colorC) && (colorC == colorM)) {
                              product1 = colorA;
                        } else if ((colorC == colorG) && (colorC == colorD)
                                                       && (colorA != colorH) && (colorA == colorI)) {
                              product1 = colorC;
                        } else {
                              product1 = INTERPOLATE(colorA, colorC);
                        }
                  }

                  *(dP + 0) = (uint16) colorA;
                  *(dP + 1) = (uint16) product;
                  *(dP + dstPitch/2 + 0) = (uint16) product1;
                  *(dP + dstPitch/2 + 1) = (uint16) product2;

                  bP += 1;
                  dP += 2;
            }

            srcPtr += srcPitch;
            dstPtr += dstPitch * 2;
      }
}

MAKE_WRAPPER(_2xSaI)

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