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CEScaler.cpp

/* ScummVM - Scumm Interpreter
 * Copyright (C) 2001-2005 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * $Header: /cvsroot/scummvm/scummvm/backends/wince/CEScaler.cpp,v 1.11.2.1 2005/10/18 02:11:17 sev Exp $
 *
 */
#include "common/scaler/intern.h"
#include "common/stdafx.h"
#include "CEScaler.h"

int redblueMasks[] = { 0x7C1F, 0xF81F };
int greenMasks[] = { 0x03E0, 0x07E0 };

static int maskUsed;

void initCEScaler(void) {
      if (gBitFormat == 555)
            maskUsed = 0;
      else
            maskUsed = 1;
}

static inline uint16 CEinterpolate16_4(uint16 p1, uint16 p2, uint16 p3, uint16 p4)
{
        return ((((p1 & redblueMasks[maskUsed]) + (p2 & redblueMasks[maskUsed]) + (p3 & redblueMasks[maskUsed]) + (p4 & redblueMasks[maskUsed])) / 4) & redblueMasks[maskUsed]) |
               ((((p1 & greenMasks[maskUsed]) + (p2 & greenMasks[maskUsed]) + (p3 & greenMasks[maskUsed]) + (p4 & greenMasks[maskUsed])) / 4) & greenMasks[maskUsed]);
}

static inline uint16 CEinterpolate16_2(uint16 p1, int w1, uint16 p2, int w2) {
        return ((((p1 & redblueMasks[maskUsed]) * w1 + (p2 & redblueMasks[maskUsed]) * w2) / (w1 + w2)) & redblueMasks[maskUsed]) |
               ((((p1 & greenMasks[maskUsed]) * w1 + (p2 & greenMasks[maskUsed]) * w2) / (w1 + w2)) & greenMasks[maskUsed]);
}

void PocketPCPortrait(const uint8 *srcPtr, uint32 srcPitch, uint8 *dstPtr, uint32 dstPitch, int width, int height) {
      uint8 *work;
      int i;

      while (height--) {
            i = 0;
            work = dstPtr;

            for (int i=0; i<width; i+=4) {
                  // Work with 4 pixels
                  uint16 color1 = *(((const uint16 *)srcPtr) + i);
                  uint16 color2 = *(((const uint16 *)srcPtr) + (i + 1));
                  uint16 color3 = *(((const uint16 *)srcPtr) + (i + 2));
                  uint16 color4 = *(((const uint16 *)srcPtr) + (i + 3));

                  *(((uint16 *)work) + 0) = CEinterpolate16_2(color1, 3, color2, 1);
                  *(((uint16 *)work) + 1) = CEinterpolate16_2(color2, 1, color3, 1);
                  *(((uint16 *)work) + 2) = CEinterpolate16_2(color3, 1, color4, 3);

                  work += 3 * sizeof(uint16);
            }
            srcPtr += srcPitch;
            dstPtr += dstPitch;
      }
}

void PocketPCHalf(const uint8 *srcPtr, uint32 srcPitch, uint8 *dstPtr, uint32 dstPitch, int width, int height) {
      uint8 *work;
      int i;
      uint16 srcPitch16 = (uint16)(srcPitch / sizeof(uint16));

      while ((height-=2) >= 0) {
            i = 0;
            work = dstPtr;

            for (int i=0; i<width; i+=2) {
                  // Another lame filter attempt :)
                  uint16 color1 = *(((const uint16 *)srcPtr) + i);
                  uint16 color2 = *(((const uint16 *)srcPtr) + (i + 1));
                  uint16 color3 = *(((const uint16 *)srcPtr) + (i + srcPitch16));
                  uint16 color4 = *(((const uint16 *)srcPtr) + (i + srcPitch16 + 1));
                  *(((uint16 *)work) + 0) = CEinterpolate16_4(color1, color2, color3, color4);

                  work += sizeof(uint16);
            }
            srcPtr += 2 * srcPitch;
            dstPtr += dstPitch;
      }
}


void PocketPCHalfZoom(const uint8 *srcPtr, uint32 srcPitch, uint8 *dstPtr, uint32 dstPitch, int width, int height) {
      uint8 *work;
      int i;
      uint16 srcPitch16 = (uint16)(srcPitch / sizeof(uint16));

      if (!height)
            return;

      while (height--) {
            i = 0;
            work = dstPtr;

            for (int i=0; i<width; i+=2) {
                  uint16 color1 = *(((const uint16 *)srcPtr) + i);
                  uint16 color2 = *(((const uint16 *)srcPtr) + (i + 1));
                  *(((uint16 *)work) + 0) = CEinterpolate16_2(color1, 1, color2, 1);

                  work += sizeof(uint16);
            }
            srcPtr += srcPitch;
            dstPtr += dstPitch;
      }
}

//#ifdef WIN32_PLATFORM_WFSP
void SmartphoneLandscape(const uint8 *srcPtr, uint32 srcPitch, uint8 *dstPtr, uint32 dstPitch, int width, int height) {
      uint8 *work;
      int i;
      int line = 0;

      while (height--) {
            i = 0;
            work = dstPtr;

            for (int i=0; i<width; i+=3) {
                  // Filter 2/3
                  uint16 color1 = *(((const uint16 *)srcPtr) + i);
                  uint16 color2 = *(((const uint16 *)srcPtr) + (i + 1));
                  uint16 color3 = *(((const uint16 *)srcPtr) + (i + 2));

                  *(((uint16 *)work) + 0) = CEinterpolate16_2(color1, 3, color2, 1);
                  *(((uint16 *)work) + 1) = CEinterpolate16_2(color2, 1, color3, 1);

                  work += 2 * sizeof(uint16);
            }
            srcPtr += srcPitch;
            dstPtr += dstPitch;
            line++;
            if (line == 7) {
                  line = 0;
                  srcPtr += srcPitch;
                  height--;
            }
      }
}
//#endif


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