Logo Search packages:      
Sourcecode: scummvm version File versions  Download package

nut_renderer.cpp

/* ScummVM - Scumm Interpreter
 * Copyright (C) 2002-2005 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/scumm/nut_renderer.cpp,v 1.65.2.1 2005/10/18 02:11:21 sev Exp $
 */

#include "common/stdafx.h"
#include "scumm/scumm.h"
#include "scumm/nut_renderer.h"
#include "scumm/util.h"

namespace Scumm {

NutRenderer::NutRenderer(ScummEngine *vm) :
      _vm(vm),
      _loaded(false),
      _numChars(0) {
      memset(_chars, 0, sizeof(_chars));
}

NutRenderer::~NutRenderer() {
      for (int i = 0; i < _numChars; i++) {
            delete []_chars[i].src;
      }
}

void smush_decode_codec1(byte *dst, const byte *src, int left, int top, int width, int height, int pitch);

static void smush_decode_codec21(byte *dst, const byte *src, int width, int height, int pitch) {
      while (height--) {
            uint8 *dstPtrNext = dst + pitch;
            const uint8 *srcPtrNext = src + 2 + READ_LE_UINT16(src); src += 2;
            int len = width;
            do {
                  int offs = READ_LE_UINT16(src); src += 2;
                  dst += offs;
                  len -= offs;
                  if (len <= 0) {
                        break;
                  }
                  int w = READ_LE_UINT16(src) + 1; src += 2;
                  len -= w;
                  if (len < 0) {
                        w += len;
                  }
                  // the original codec44 handles this part slightly differently (this is the only difference with codec21) :
                  //  src bytes equal to 255 are replaced by 0 in dst
                  //  src bytes equal to 1 are replaced by a color passed as an argument in the original function
                  //  other src bytes values are copied as-is
                  memcpy(dst, src, w); dst += w; src += w;
            } while (len > 0);
            dst = dstPtrNext;
            src = srcPtrNext;
      }
}

bool NutRenderer::loadFont(const char *filename) {
      if (_loaded) {
            debug(0, "NutRenderer::loadFont() Font already loaded, ok, loading...");
      }

      ScummFile file;
      _vm->openFile(file, filename);
      if (!file.isOpen()) {
            error("NutRenderer::loadFont() Can't open font file: %s", filename);
            return false;
      }

      uint32 tag = file.readUint32BE();
      if (tag != 'ANIM') {
            error("NutRenderer::loadFont() there is no ANIM chunk in font header");
            return false;
      }

      uint32 length = file.readUint32BE();
      byte *dataSrc = (byte *)malloc(length);
      file.read(dataSrc, length);
      file.close();

      if (READ_BE_UINT32(dataSrc) != 'AHDR') {
            error("NutRenderer::loadFont() there is no AHDR chunk in font header");
            free(dataSrc);
            return false;
      }

      _numChars = READ_LE_UINT16(dataSrc + 10);
      assert(_numChars <= ARRAYSIZE(_chars));
      uint32 offset = 0;
      for (int l = 0; l < _numChars; l++) {
            offset += READ_BE_UINT32(dataSrc + offset + 4) + 8;
            if (READ_BE_UINT32(dataSrc + offset) != 'FRME') {
                  error("NutRenderer::loadFont(%s) there is no FRME chunk %d (offset %x)", filename, l, offset);
                  break;
            }
            offset += 8;
            if (READ_BE_UINT32(dataSrc + offset) != 'FOBJ') {
                  error("NutRenderer::loadFont(%s) there is no FOBJ chunk in FRME chunk %d (offset %x)", filename, l, offset);
                  break;
            }
            int codec = READ_LE_UINT16(dataSrc + offset + 8);
            _chars[l].xoffs = READ_LE_UINT16(dataSrc + offset + 10);
            _chars[l].yoffs = READ_LE_UINT16(dataSrc + offset + 12);
            _chars[l].width = READ_LE_UINT16(dataSrc + offset + 14);
            _chars[l].height = READ_LE_UINT16(dataSrc + offset + 16);
            const int srcSize = _chars[l].width * _chars[l].height;
            _chars[l].src = new byte[srcSize];
            // If characters have transparency, then bytes just get skipped and
            // so there may appear some garbage. That's why we have to fill it
            // with zeroes first.
            memset(_chars[l].src, 0, srcSize);

            const uint8 *fobjptr = dataSrc + offset + 22;
            switch (codec) {
            case 1:
                  smush_decode_codec1(_chars[l].src, fobjptr, 0, 0, _chars[l].width, _chars[l].height, _chars[l].width);
                  break;
            case 21:
            case 44:
                  smush_decode_codec21(_chars[l].src, fobjptr, _chars[l].width, _chars[l].height, _chars[l].width);
                  break;
            default:
                  error("NutRenderer::loadFont: unknown codec: %d", codec);
            }
      }

      free(dataSrc);
      _loaded = true;
      return true;
}

int NutRenderer::getCharWidth(byte c) const {
      if (!_loaded) {
            error("NutRenderer::getCharWidth() Font is not loaded");
            return 0;
      }

      if (c >= 0x80 && _vm->_useCJKMode)
            return _vm->_2byteWidth / 2;

      if (c >= _numChars)
            error("invalid character in NutRenderer::getCharWidth : %d (%d)", c, _numChars);

      return _chars[c].width;
}

int NutRenderer::getCharHeight(byte c) const {
      if (!_loaded) {
            error("NutRenderer::getCharHeight() Font is not loaded");
            return 0;
      }

      if (c >= 0x80 && _vm->_useCJKMode)
            return _vm->_2byteHeight;

      if (c >= _numChars)
            error("invalid character in NutRenderer::getCharHeight : %d (%d)", c, _numChars);

      return _chars[c].height;
}

void NutRenderer::drawShadowChar(const Graphics::Surface &s, int c, int x, int y, byte color, bool showShadow) {
      if (!_loaded) {
            error("NutRenderer::drawShadowChar() Font is not loaded");
            return;
      }

      // HACK: we draw the character a total of 7 times: 6 times shifted
      // and in black for the shadow, and once in the right color and position.
      // This way we achieve the exact look as the original CMI had. However,
      // the question remains whether they did it this way, too, or if there is
      // some "font shadow" resource we don't know yet.

      static const int offsetX[7] = { -1,  0, 1, 0, 1, 2, 0 };
      static const int offsetY[7] = {  0, -1, 0, 1, 2, 1, 0 };
      const int cTable[7] = { 0, 0, 0, 0, 0, 0, color };
      int i = 0;

      if (!showShadow)
            i = 6;

      for (; i < 7; i++) {
            x += offsetX[i];
            y += offsetY[i];
            color = cTable[i];

            if (c >= 256 && _vm->_useCJKMode)
                  draw2byte(s, c, x, y, color);
            else
                  drawChar(s, (byte)c, x, y, color);

            x -= offsetX[i];
            y -= offsetY[i];
      }
}

void NutRenderer::drawFrame(byte *dst, int c, int x, int y) {
      const int width = MIN(_chars[c].width, _vm->_screenWidth - x);
      const int height = MIN(_chars[c].height, _vm->_screenHeight - y);
      const byte *src = _chars[c].src;
      const int srcPitch = _chars[c].width;
      byte bits = 0;

      const int minX = x < 0 ? -x : 0;
      const int minY = y < 0 ? -y : 0;

      if (height <= 0 || width <= 0) {
            return;
      }

      dst += _vm->_screenWidth * y + x;
      if (minY) {
            src += minY * srcPitch;
            dst += minY * _vm->_screenWidth;
      }

      for (int ty = minY; ty < height; ty++) {
            for (int tx = minX; tx < width; tx++) {
                  bits = src[tx];
                  if (bits != 231 && bits) {
                        dst[tx] = bits;
                  }
            }
            src += srcPitch;
            dst += _vm->_screenWidth;
      }
}

void NutRenderer::drawChar(const Graphics::Surface &s, byte c, int x, int y, byte color) {
      byte *dst = (byte *)s.pixels + y * s.pitch + x;
      const int width = MIN(_chars[c].width, s.w - x);
      const int height = MIN(_chars[c].height, s.h - y);
      const byte *src = _chars[c].src;
      const int srcPitch = _chars[c].width;

      const int minX = x < 0 ? -x : 0;
      const int minY = y < 0 ? -y : 0;

      if (height <= 0 || width <= 0) {
            return;
      }

      if (minY) {
            src += minY * srcPitch;
            dst += minY * s.pitch;
      }

      for (int ty = minY; ty < height; ty++) {
            for (int tx = minX; tx < width; tx++) {
                  if (src[tx] != 0) {
                        dst[tx] = color;
                  }
            }
            src += srcPitch;
            dst += s.pitch;
      }
}

void NutRenderer::draw2byte(const Graphics::Surface &s, int c, int x, int y, byte color) {
      if (!_loaded) {
            error("NutRenderer::draw2byte() Font is not loaded");
            return;
      }

      byte *dst = (byte *)s.pixels + y * s.pitch + x;
      const int width = _vm->_2byteWidth;
      const int height = MIN(_vm->_2byteHeight, s.h - y);
      const byte *src = _vm->get2byteCharPtr(c);
      byte bits = 0;

      if (height <= 0 || width <= 0) {
            return;
      }

      for (int ty = 0; ty < height; ty++) {
            for (int tx = 0; tx < width; tx++) {
                  if ((tx & 7) == 0)
                        bits = *src++;
                  if (x + tx < 0 || x + tx >= s.w || y + ty < 0)
                        continue;
                  if (bits & revBitMask(tx % 8)) {
                        dst[tx] = color;
                  }
            }
            dst += s.pitch;
      }
}

} // End of namespace Scumm

Generated by  Doxygen 1.6.0   Back to index