sprImage.cpp

   1 /*
   2  *  sprImage.cpp
   3  *  openc2e
   4  *
   5  *  Created by Alyssa Milburn on Sun Nov 19 2006.
   6  *  Copyright (c) 2006 Alyssa Milburn. All rights reserved.
   7  *
   8  *  This library is free software; you can redistribute it and/or
   9  *  modify it under the terms of the GNU Lesser General Public
  10  *  License as published by the Free Software Foundation; either
  11  *  version 2 of the License, or (at your option) any later version.
  12  *
  13  *  This library is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  *  Lesser General Public License for more details.
  17  *
  18  */
  19
  20 #include "openc2e.h"
  21 #include "sprImage.h"
  22 #include <iostream>
  23
  24 sprImage::sprImage(mmapifstream *in, std::string n) : creaturesImage(n) {
  25         stream = in;
  26         imgformat = if_paletted;
  27
  28         uint16 spritecount;
  29         in->read((char *)&spritecount, 2); m_numframes = swapEndianShort(spritecount);
  30
  31         widths = new uint16[m_numframes];
  32         heights = new uint16[m_numframes];
  33         offsets = new uint32[m_numframes];
  34         buffers = new void *[m_numframes];
  35
  36         for (unsigned int i = 0; i < m_numframes; i++) {
  37                 in->read((char *)&offsets[i], 4); offsets[i] = swapEndianLong(offsets[i]);
  38                 in->read((char *)&widths[i], 2); widths[i] = swapEndianShort(widths[i]);
  39                 in->read((char *)&heights[i], 2); heights[i] = swapEndianShort(heights[i]);
  40                 buffers[i] = in->map + offsets[i];
  41         }
  42 }
  43
  44 /*
  45  * Hacky fix for corrupt offset tables in SPR files.
  46  * Only works if the file has 'normal' offsets we can predict, but this will only be called
  47  * on known files anyway.
  48  */
  49 void sprImage::fixBufferOffsets() {
  50         // we can do this safely because we only have an mmapifstream constructor
  51         mmapifstream *in = (mmapifstream *)stream;
  52
  53         unsigned int currpos = 2 + (8 * m_numframes);
  54         for (unsigned int i = 0; i < m_numframes; i++) {
  55                 buffers[i] = in->map + currpos;
  56                 currpos += widths[i] * heights[i];
  57         }
  58 }
  59
  60 sprImage::~sprImage() {
  61         delete[] widths;
  62         delete[] heights;
  63         delete[] buffers;
  64         delete[] offsets;
  65 }
  66
  67 bool sprImage::transparentAt(unsigned int frame, unsigned int x, unsigned int y) {
  68         unsigned int offset = (y * widths[frame]) + x;
  69         unsigned char *buffer = (unsigned char *)buffers[frame];
  70         return (buffer[offset] == 0);
  71 }
  72
  73 /* vim: set noet: */