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driver_vga.cpp

/* ScummVM - Scumm Interpreter
 * Copyright (C) 2004 Ivan Dubrov
 * Copyright (C) 2004-2005 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/gob/driver_vga.cpp,v 1.11.2.1 2005/10/18 02:11:18 sev Exp $
 *
 */
#include "gob/driver_vga.h"
#include "graphics/primitives.h"

#if defined  (_MSC_VER) || defined (__WINS__)
#define STUB_FUNC printf("STUB:")
#else
#define STUB_FUNC printf("STUB: %s\n", __PRETTY_FUNCTION__)
#endif

namespace Gob {

void VGAVideoDriver::drawSprite(SurfaceDesc *source, SurfaceDesc *dest, int16 left, int16 top, int16 right, int16 bottom, int16 x, int16 y, int16 transp) {
      if (x >= 0 && x < dest->width && y >= 0 && y < dest->height) {
            int16 width = (right - left) + 1;
            int16 height = (bottom - top) + 1;

            byte *srcPos = source->vidPtr + (top * source->width) + left;
            byte *destPos = dest->vidPtr + (y * dest->width) + x;
            while (height--) {
                  if (transp) {
                        for (int16 i = 0; i < width; ++i) {
                              if (srcPos[i])
                                    destPos[i] = srcPos[i];
                        }
                  } else {
                        for (int16 i = 0; i < width; ++i)
                              destPos[i] = srcPos[i];
                  }

                  srcPos += source->width; //width ?
                  destPos += dest->width;
            }
      }
}

void VGAVideoDriver::fillRect(SurfaceDesc *dest, int16 left, int16 top, int16 right, int16 bottom, byte color) {
      if (left < dest->width && right < dest->width && top < dest->height && bottom < dest->height) {
            byte *pos = dest->vidPtr + (top * dest->width) + left;
            int16 width = (right - left) + 1;
            int16 height = (bottom - top) + 1;
            while (height--) {
                  for (int16 i = 0; i < width; ++i) {
                        pos[i] = color;
                  }

                  pos += dest->width;
            }
      }
}

void VGAVideoDriver::putPixel(int16 x, int16 y, byte color, SurfaceDesc *dest) {
      if (x >= 0 && x < dest->width && y >= 0 && y < dest->height)
            dest->vidPtr[(y * dest->width) + x] = color;
}

void VGAVideoDriver::drawLetter(unsigned char item, int16 x, int16 y, FontDesc *fontDesc, byte color1, byte color2, byte transp, SurfaceDesc *dest) {
      byte *src, *dst;
      uint16 data;
      int i, j;

      src = (byte *)fontDesc->dataPtr + (item - fontDesc->startItem) * (fontDesc->itemSize & 0xff);
      dst = dest->vidPtr + x + dest->width * y;

      for (i = 0; i < fontDesc->itemHeight; i++) {
            data = READ_BE_UINT16(src);
            src += 2;
            if (fontDesc->itemSize <= 8)
                  src--;

            for (j = 0; j < fontDesc->itemWidth; j++) {
                  if (data & 0x8000) {
                        *dst = color2;
                  } else {
                        if (color1 == 0)
                              *dst = transp;
                  }
                  dst++;
                  data <<= 1;
            }
            dst += dest->width - fontDesc->itemWidth;
      }
}

static void plotPixel(int x, int y, int color, void *data) {
      SurfaceDesc *dest = (SurfaceDesc *)data;
      if (x >= 0 && x < dest->width && y >= 0 && y < dest->height)
            dest->vidPtr[(y * dest->width) + x] = color;
}

void VGAVideoDriver::drawLine(SurfaceDesc *dest, int16 x0, int16 y0, int16 x1, int16 y1, byte color) {
      Graphics::drawLine(x0, y0, x1, y1, color, &plotPixel, dest);
}

void VGAVideoDriver::drawPackedSprite(byte *sprBuf, int16 width, int16 height, int16 x, int16 y, byte transp, SurfaceDesc *dest) {
      int destRight = x + width;
      int destBottom = y + height;

      byte* dst = dest->vidPtr + x + dest->width * y;

      int curx = x;
      int cury = y;

      while (1) {
            uint8 val = *sprBuf++;
            unsigned int repeat = val & 7;
            val &= 0xF8;
            if (!(val & 8)) {
                  repeat <<= 8;
                  repeat |= *sprBuf++;
            }
            repeat++;
            val >>= 4;

            for (unsigned int i = 0; i < repeat; ++i) {
                  if (curx < dest->width && cury < dest->height)
                        if (!transp || val)
                              *dst = val;

                  dst++;
                  curx++;
                  if (curx == destRight) {
                        dst += dest->width + x - curx;
                        curx = x;
                        cury++;
                        if (cury == destBottom)
                              return;
                  }
            }
      }

}

}


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