Function bm_pcx_24bit_alloc_file

bitmap/pcx.cpp:180–316

load a 24bit pcx image

// load a 24bit pcx image
int bm_pcx_24bit_alloc_file(CFILE *infile) {
  int xmin, ymin, xmax, ymax;
  int width, height;
  int total, run = 0;
  int i, t;
  int src_bm;
  uint8_t buf;
  uint8_t temp[128];

  cf_ReadBytes(temp, 4, infile);

  if (temp[1] < 5) {
    // need at least version 5.0f
    mprintf(0, "PCXLoad: PCX Not version 5.0 or greater\n");
    return -1;
  }

  if (temp[3] != 8) {
    // need 8 bits per pixel
    mprintf(0, "PCXLoad: PCX Not 8 bpp\n");
    return -1; // nope...bail
  }

  xmin = cf_ReadShort(infile);
  ymin = cf_ReadShort(infile);
  xmax = cf_ReadShort(infile);
  ymax = cf_ReadShort(infile);

  cf_ReadBytes(temp, 116, infile);

#define PCXHEADER_OFFSET 12

  if (temp[65 - PCXHEADER_OFFSET] != 3) {
    // Must have 3 planes
    mprintf(0, "PCXLoad: PCX Not 3 Planes for 24bit encoding\n");
    return -1;
  }

  width = 1 + xmax - xmin;
  height = 1 + ymax - ymin;

  // Determine BytesPerLine
  cfseek(infile, 66, SEEK_SET);
  int BytesPerLine = cf_ReadShort(infile);
  cfseek(infile, 128, SEEK_SET);

  // scanline length
  total = 3 * BytesPerLine;

  uint8_t *rawdata = (uint8_t *)mem_malloc(total * height);
  if (!rawdata) {
    mprintf(0, "PCXLoad: Out of memory\n");
    return -1; // no memory!
  }

  // Load in the data
  // the data is divided into scanlines
  // the first scanline is line 0's red