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CEScaler.cpp

/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * 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.
 *
 * $URL: https://scummvm.svn.sourceforge.net/svnroot/scummvm/scummvm/tags/release-0-13-0/backends/platform/wince/CEScaler.cpp $
 * $Id: CEScaler.cpp 36339 2009-02-14 19:43:17Z knakos $
 *
 */
#include "graphics/scaler/intern.h"
#include "CEScaler.h"

template<int bitFormat>
void PocketPCPortraitTemplate(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) = interpolate32_3_1<bitFormat>(color1, color2);
                  *(((uint16 *)work) + 1) = interpolate32_1_1<bitFormat>(color2, color3);
                  *(((uint16 *)work) + 2) = interpolate32_3_1<bitFormat>(color4, color3);

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

// Our version of an aspect scaler. Main difference is the out-of-place
// operation, omitting a straight blit step the sdl backend does. Also,
// tests show unaligned access errors with the stock aspect scaler.
void PocketPCLandscapeAspect(const uint8 *srcPtr, uint32 srcPitch, uint8 *dstPtr, uint32 dstPitch, int width, int height) {

      const int redblueMasks[] = { 0x7C1F, 0xF81F };
      const int greenMasks[] = { 0x03E0, 0x07E0 };
      const int RBM = redblueMasks[gBitFormat == 565];
      const int GM = greenMasks[gBitFormat == 565];

      int i,j;
      unsigned int p1, p2;
      uint8 *inbuf, *outbuf, *instart, *outstart;

#define RB(x) ((x & RBM)<<8)
#define G(x)  ((x & GM)<<3)

#define P20(x) (((x)>>2)-((x)>>4))
#define P40(x) (((x)>>1)-((x)>>3))
#define P60(x) (((x)>>1)+((x)>>3))
#define P80(x) (((x)>>1)+((x)>>2)+((x)>>4))

#define MAKEPIXEL(rb,g) ((((rb)>>8) & RBM | ((g)>>3) & GM))

      inbuf = (uint8 *)srcPtr;
      outbuf = (uint8 *)dstPtr;
      height /= 5;

      for (i = 0; i < height; i++) {
            instart = inbuf;
            outstart = outbuf;
            for (j=0; j < width; j++) {

                  p1 = *(uint16*)inbuf; inbuf += srcPitch;
                  *(uint16*)outbuf = p1; outbuf += dstPitch;

                  p2 = *(uint16*)inbuf; inbuf += srcPitch;
                  *(uint16*)outbuf = MAKEPIXEL(P20(RB(p1))+P80(RB(p2)),P20(G(p1))+P80(G(p2)));  outbuf += dstPitch;

                  p1 = p2;
                  p2 = *(uint16*)inbuf; inbuf += srcPitch;
                  *(uint16*)outbuf = MAKEPIXEL(P40(RB(p1))+P60(RB(p2)),P40(G(p1))+P60(G(p2)));  outbuf += dstPitch;

                  p1 = p2;
                  p2 = *(uint16*)inbuf; inbuf += srcPitch;
                  *(uint16*)outbuf = MAKEPIXEL(P60(RB(p1))+P40(RB(p2)),P60(G(p1))+P40(G(p2)));  outbuf += dstPitch;

                  p1 = p2;
                  p2 = *(uint16*)inbuf;
                  *(uint16*)outbuf = MAKEPIXEL(P80(RB(p1))+P20(RB(p2)),P80(G(p1))+P20(G(p2)));  outbuf += dstPitch;

                  *(uint16*)outbuf = p2;

                  inbuf = inbuf - srcPitch*4 + sizeof(uint16);
                  outbuf = outbuf - dstPitch*5 + sizeof(uint16);
            }
            inbuf = instart + srcPitch*5;
            outbuf = outstart + dstPitch*6;
      }
}

#ifdef ARM
extern "C" {
      void PocketPCHalfARM(const uint8 *srcPtr, uint32 srcPitch, uint8 *dstPtr, uint32 dstPitch, int width, int height, int mask, int round);
      // Rounding constants and masks used for different pixel formats
      int roundingconstants[] = { 0x00200802, 0x00201002 };
      int redbluegreenMasks[] = { 0x03E07C1F, 0x07E0F81F };
}
#endif

template<int bitFormat>
void PocketPCHalfTemplate(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) = interpolate32_1_1_1_1<bitFormat>(color1, color2, color3, color4);

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

void PocketPCHalf(const uint8 *srcPtr, uint32 srcPitch, uint8 *dstPtr, uint32 dstPitch, int width, int height) {
#ifdef ARM
      int maskUsed = (gBitFormat == 565);
      PocketPCHalfARM(srcPtr, srcPitch, dstPtr, dstPitch, width, height, redbluegreenMasks[maskUsed],roundingconstants[maskUsed]);
#else
      if (gBitFormat == 565)
            PocketPCHalfTemplate<565>(srcPtr, srcPitch, dstPtr, dstPitch, width, height);
      else
            PocketPCHalfTemplate<565>(srcPtr, srcPitch, dstPtr, dstPitch, width, height);
#endif
}

template<int bitFormat>
void PocketPCHalfZoomTemplate(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) = interpolate32_1_1<bitFormat>(color1, color2);

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

template<int bitFormat>
void SmartphoneLandscapeTemplate(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) = interpolate32_3_1<bitFormat>(color1, color2);
                  *(((uint16 *)work) + 1) = interpolate32_3_1<bitFormat>(color3, color2);

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

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