text: /*
   * Copyright (C) 2010 Cameron Zemek ( grom@zeminvaders.net)
   *
   * This program is free software; you can redistribute it and/or
   * modify it under the terms of the GNU Lesser General Public
   * License as published by the Free Software Foundation; either
   * version 2.1 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
   * Lesser General Public License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with this program; if not, write to the Free Software
   * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
   */
  
  #include <unistd.h>
  #include <stdint.h>
  #include <stdlib.h>
  #include <hqx.h>
  #include <IL/il.h>
  
  static inline uint32_t swapByteOrder(uint32_t ui)
  {
      return (ui >> 24) | ((ui << 8) & 0x00FF0000) | ((ui >> 8) & 0x0000FF00) | (ui << 24);
  }
  
  int main(int argc, char *argv[])
  {
      int opt;
      int scaleBy = 4;
      while ((opt = getopt(argc, argv, "s:")) != -1) {
          switch (opt) {
          case 's':
              scaleBy = atoi(optarg);
              if (scaleBy != 2 && scaleBy != 3 && scaleBy != 4) {
                  fprintf(stderr, "Only scale factors of 2, 3, and 4 are supported.");
                  return 1;
              }
              break;
          default:
              goto error_usage;
          }
      }
  
      if (optind + 2 > argc) {
  error_usage:
          fprintf(stderr, "Usage: %s [-s scaleBy] input output\n", argv[0]);
          return 1;
      }
  
  	ILuint handle, width, height;
  
      char *szFilenameIn = argv[optind];
      char *szFilenameOut = argv[optind + 1];
  
  	ilInit();
  	ilEnable(IL_ORIGIN_SET);
  	ilGenImages(1, &handle);
  	ilBindImage(handle);
  
  	// Load image
  	ILboolean loaded = ilLoadImage(szFilenameIn);
      if (loaded == IL_FALSE) {
          fprintf(stderr, "ERROR: can't load '%s'\n", szFilenameIn);
          return 1;
      }
  	width = ilGetInteger(IL_IMAGE_WIDTH);
  	height = ilGetInteger(IL_IMAGE_HEIGHT);
  
  	// Allocate memory for image data
  	size_t srcSize = width * height * sizeof(uint32_t);
  	uint8_t *srcData = (uint8_t *) malloc(srcSize);
  	size_t destSize = width * scaleBy * height * scaleBy * sizeof(uint32_t);
  	uint8_t *destData = (uint8_t *) malloc(destSize);
  
  	// Init srcData from loaded image
      // We want the pixels in BGRA format so that when converting to uint32_t
      // we get a RGB value due to little-endianness.
  	ilCopyPixels(0, 0, 0, width, height, 1, IL_BGRA, IL_UNSIGNED_BYTE, srcData);
  
      // Discard the alpha byte since the RGBtoYUV conversion
      // expects the most significant byte to be empty
      size_t i;
      for (i = 3; i < srcSize; i += 4) {
          srcData[i] = 0;
      }
  
      uint32_t *sp = (uint32_t *) srcData;
      uint32_t *dp = (uint32_t *) destData;
  
      // If big endian we have to swap the byte order to get RGB values
      #ifdef WORDS_BIGENDIAN
      uint32_t *spTemp = sp;
      for (i = 0; i < srcSize >> 2; i++) {
          spTemp[i] = swapByteOrder(spTemp[i]);
      }
      #endif
  
      hqxInit();
      switch (scaleBy) {
      case 2:
          hq2x_32(sp, dp, width, height);
          break;
      case 3:
          hq3x_32(sp, dp, width, height);
          break;
      case 4:
      default:
          hq4x_32(sp, dp, width, height);
          break;
      }
  
      // If big endian we have to swap byte order of destData to get BGRA format
      #ifdef WORDS_BIGENDIAN
      uint32_t *dpTemp = dp;
      for (i = 0; i < destSize >> 2; i++) {
          dpTemp[i] = swapByteOrder(dpTemp[i]);
      }
      #endif
  
  	// Copy destData into image
  	ilTexImage(width * scaleBy, height * scaleBy, 0, 4, IL_BGRA, IL_UNSIGNED_BYTE, destData);
  
      // Free image data
      free(srcData);
      free(destData);
  
      // Save image
  	ilConvertImage(IL_BGR, IL_UNSIGNED_BYTE); // No alpha channel
  	ilHint(IL_COMPRESSION_HINT, IL_USE_COMPRESSION);
      ilEnable(IL_FILE_OVERWRITE);
  	ILboolean saved = ilSaveImage(szFilenameOut);
  
      ilDeleteImages(1, &handle);
  
      if (saved == IL_FALSE) {
          fprintf(stderr, "ERROR: can't save '%s'\n", szFilenameOut);
          return 1;
      }
  
      return 0;
  }
  