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driver_vga.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-0-11-1/engines/gob/driver_vga.cpp $
 * $Id: driver_vga.cpp 30944 2008-02-23 22:50:18Z sev $
 *
 */


#include "common/endian.h"
#include "graphics/primitives.h"

#include "gob/driver_vga.h"

namespace Gob {

static void plotPixel(int x, int y, int color, void *data) {
      SurfaceDesc *dest = (SurfaceDesc *)data;

      if ((x >= 0) && (x < dest->getWidth()) &&
          (y >= 0) && (y < dest->getHeight()))
            dest->getVidMem()[(y * dest->getWidth()) + x] = color;
}

void VGAVideoDriver::putPixel(int16 x, int16 y, byte color, SurfaceDesc *dest) {
      if ((x >= 0) && (x < dest->getWidth()) &&
          (y >= 0) && (y < dest->getHeight()))
            dest->getVidMem()[(y * dest->getWidth()) + 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::fillRect(SurfaceDesc *dest, int16 left, int16 top,
            int16 right, int16 bottom, byte color) {

      if ((left >= dest->getWidth()) || (right >= dest->getWidth()) ||
          (top >= dest->getHeight()) || (bottom >= dest->getHeight()))
            return;

      byte *pos = dest->getVidMem() + (top * dest->getWidth()) + 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->getWidth();
      }
}

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

      src = fontDesc->dataPtr +
            (item - fontDesc->startItem) * (fontDesc->itemSize & 0xFF);
      dst = dest->getVidMem() + x + dest->getWidth() * y;

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

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

                  dst++;
                  data <<= 1;
            }
            dst += dest->getWidth() - fontDesc->itemWidth;
      }
}

void VGAVideoDriver::drawSprite(SurfaceDesc *source, SurfaceDesc *dest,
            int16 left, int16 top, int16 right, int16 bottom,
            int16 x, int16 y, int16 transp) {

      if ((x >= dest->getWidth()) || (x < 0) ||
          (y >= dest->getHeight()) || (y < 0))
            return;

      int16 width = MIN((right - left) + 1, (int) dest->getWidth());
      int16 height = MIN((bottom - top) + 1, (int) dest->getHeight());

      byte *srcPos = source->getVidMem() + (top * source->getWidth()) + left;
      byte *destPos = dest->getVidMem() + (y * dest->getWidth()) + x;

      if (transp) {
            while (height--) {
                  for (int16 i = 0; i < width; ++i) {
                        if (srcPos[i])
                              destPos[i] = srcPos[i];
                  }

                  srcPos += source->getWidth();
                  destPos += dest->getWidth();
            }
      } else {
            while (height--) {
                  memcpy(destPos, srcPos, width);

                  srcPos += source->getWidth();
                  destPos += dest->getWidth();
            }
      }
}

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->getVidMem() + x + dest->getWidth() * 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->getWidth() && cury < dest->getHeight())
                        if (!transp || val)
                              *dst = val;

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

      }

}

}


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