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src/Source/LibJPEG/rdtarga.c  view on Meta::CPAN

    source->block_count = source->dup_pixel_count = 0;
    subtype -= 8;
  } else {
    /* Non-RLE file */
    source->read_pixel = read_non_rle_pixel;
  }

  /* Now should have subtype 1, 2, or 3 */
  components = 3;		/* until proven different */
  cinfo->in_color_space = JCS_RGB;

  switch (subtype) {
  case 1:			/* Colormapped image */
    if (source->pixel_size == 1 && cmaptype == 1)
      source->get_pixel_rows = get_8bit_row;
    else
      ERREXIT(cinfo, JERR_TGA_BADPARMS);
    TRACEMS2(cinfo, 1, JTRC_TGA_MAPPED, width, height);
    break;
  case 2:			/* RGB image */
    switch (source->pixel_size) {
    case 2:
      source->get_pixel_rows = get_16bit_row;
      break;
    case 3:
      source->get_pixel_rows = get_24bit_row;
      break;
    case 4:
      source->get_pixel_rows = get_32bit_row;
      break;
    default:
      ERREXIT(cinfo, JERR_TGA_BADPARMS);
      break;
    }
    TRACEMS2(cinfo, 1, JTRC_TGA, width, height);
    break;
  case 3:			/* Grayscale image */
    components = 1;
    cinfo->in_color_space = JCS_GRAYSCALE;
    if (source->pixel_size == 1)
      source->get_pixel_rows = get_8bit_gray_row;
    else
      ERREXIT(cinfo, JERR_TGA_BADPARMS);
    TRACEMS2(cinfo, 1, JTRC_TGA_GRAY, width, height);
    break;
  default:
    ERREXIT(cinfo, JERR_TGA_BADPARMS);
    break;
  }

  if (is_bottom_up) {
    /* Create a virtual array to buffer the upside-down image. */
    source->whole_image = (*cinfo->mem->request_virt_sarray)
      ((j_common_ptr) cinfo, JPOOL_IMAGE, FALSE,
       (JDIMENSION) width * components, (JDIMENSION) height, (JDIMENSION) 1);
    if (cinfo->progress != NULL) {
      cd_progress_ptr progress = (cd_progress_ptr) cinfo->progress;
      progress->total_extra_passes++; /* count file input as separate pass */
    }
    /* source->pub.buffer will point to the virtual array. */
    source->pub.buffer_height = 1; /* in case anyone looks at it */
    source->pub.get_pixel_rows = preload_image;
  } else {
    /* Don't need a virtual array, but do need a one-row input buffer. */
    source->whole_image = NULL;
    source->pub.buffer = (*cinfo->mem->alloc_sarray)
      ((j_common_ptr) cinfo, JPOOL_IMAGE,
       (JDIMENSION) width * components, (JDIMENSION) 1);
    source->pub.buffer_height = 1;
    source->pub.get_pixel_rows = source->get_pixel_rows;
  }
  
  while (idlen--)		/* Throw away ID field */
    (void) read_byte(source);

  if (maplen > 0) {
    if (maplen > 256 || GET_2B(3) != 0)
      ERREXIT(cinfo, JERR_TGA_BADCMAP);
    /* Allocate space to store the colormap */
    source->colormap = (*cinfo->mem->alloc_sarray)
      ((j_common_ptr) cinfo, JPOOL_IMAGE, (JDIMENSION) maplen, (JDIMENSION) 3);
    /* and read it from the file */
    read_colormap(source, (int) maplen, UCH(targaheader[7]));
  } else {
    if (cmaptype)		/* but you promised a cmap! */
      ERREXIT(cinfo, JERR_TGA_BADPARMS);
    source->colormap = NULL;
  }

  cinfo->input_components = components;
  cinfo->data_precision = 8;
  cinfo->image_width = width;
  cinfo->image_height = height;
}


/*
 * Finish up at the end of the file.
 */

METHODDEF(void)
finish_input_tga (j_compress_ptr cinfo, cjpeg_source_ptr sinfo)
{
  /* no work */
}


/*
 * The module selection routine for Targa format input.
 */

GLOBAL(cjpeg_source_ptr)
jinit_read_targa (j_compress_ptr cinfo)
{
  tga_source_ptr source;

  /* Create module interface object */
  source = (tga_source_ptr)
      (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
				  SIZEOF(tga_source_struct));
  source->cinfo = cinfo;	/* make back link for subroutines */