C++ refimport_t::FS_FreeFile方法代码示例

//.........这里部分代码省略.........
   */

  /* Step 4: set parameters for decompression */

  /*
   * Make sure it always converts images to RGB color space. This will
   * automatically convert 8-bit greyscale images to RGB as well.
   */
  cinfo.out_color_space = JCS_RGB;

  /* Step 5: Start decompressor */

  (void) jpeg_start_decompress(&cinfo);
  /* We can ignore the return value since suspension is not possible
   * with the stdio data source.
   */

  /* We may need to do some setup of our own at this point before reading
   * the data.  After jpeg_start_decompress() we have the correct scaled
   * output image dimensions available, as well as the output colormap
   * if we asked for color quantization.
   * In this example, we need to make an output work buffer of the right size.
   */ 
  /* JSAMPLEs per row in output buffer */

  pixelcount = cinfo.output_width * cinfo.output_height;

  if(!cinfo.output_width || !cinfo.output_height
      || ((pixelcount * 4) / cinfo.output_width) / 4 != cinfo.output_height
      || pixelcount > 0x1FFFFFFF || cinfo.output_components != 3
    )
  {
    // Free the memory to make sure we don't leak memory
    ri.FS_FreeFile (fbuffer.v);
    jpeg_destroy_decompress(&cinfo);
  
    ri.Error(ERR_DROP, "LoadJPG: %s has an invalid image format: %dx%d*4=%d, components: %d", filename,
		    cinfo.output_width, cinfo.output_height, pixelcount * 4, cinfo.output_components);
  }

  memcount = pixelcount * 4;
  row_stride = cinfo.output_width * cinfo.output_components;

  out = ri.Malloc(memcount);

  *width = cinfo.output_width;
  *height = cinfo.output_height;

  /* Step 6: while (scan lines remain to be read) */
  /*           jpeg_read_scanlines(...); */

  /* Here we use the library's state variable cinfo.output_scanline as the
   * loop counter, so that we don't have to keep track ourselves.
   */
  while (cinfo.output_scanline < cinfo.output_height) {
    /* jpeg_read_scanlines expects an array of pointers to scanlines.
     * Here the array is only one element long, but you could ask for
     * more than one scanline at a time if that's more convenient.
     */
	buf = ((out+(row_stride*cinfo.output_scanline)));
	buffer = &buf;
    (void) jpeg_read_scanlines(&cinfo, buffer, 1);
  }
  
  buf = out;

void R_LoadPCX ( const char *filename, byte **pic, int *width, int *height)
{
	union {
		byte *b;
		void *v;
	} raw;
	byte	*end;
	pcx_t	*pcx;
	int		len;
	unsigned char	dataByte = 0, runLength = 0;
	byte	*out, *pix;
	unsigned short w, h;
	byte	*pic8;
	byte	*palette;
	int	i;
	unsigned size = 0;

	if (width)
		*width = 0;
	if (height)
		*height = 0;
	*pic = NULL;

	//
	// load the file
	//
	len = ri.FS_ReadFile( ( char * ) filename, &raw.v);
	if (!raw.b || len < 0) {
		return;
	}

	if((unsigned)len < sizeof(pcx_t))
	{
		ri.Printf (PRINT_ALL, "PCX truncated: %s\n", filename);
		ri.FS_FreeFile (raw.v);
		return;
	}

	//
	// parse the PCX file
	//
	pcx = (pcx_t *)raw.b;
	end = raw.b+len;

	w = LittleShort(pcx->xmax)+1;
	h = LittleShort(pcx->ymax)+1;
	size = w*h;

	if (pcx->manufacturer != 0x0a
		|| pcx->version != 5
		|| pcx->encoding != 1
		|| pcx->color_planes != 1
		|| pcx->bits_per_pixel != 8
		|| w >= 1024
		|| h >= 1024)
	{
		ri.Printf (PRINT_ALL, "Bad or unsupported pcx file %s (%dx%[email protected]%d)\n", filename, w, h, pcx->bits_per_pixel);
		return;
	}

	pix = pic8 = ri.Malloc ( size );

	raw.b = pcx->data;
	// FIXME: should use bytes_per_line but original q3 didn't do that either
	while(pix < pic8+size)
	{
		if(runLength > 0) {
			*pix++ = dataByte;
			--runLength;
			continue;
		}

		if(raw.b+1 > end)
			break;
		dataByte = *raw.b++;

		if((dataByte & 0xC0) == 0xC0)
		{
			if(raw.b+1 > end)
				break;
			runLength = dataByte & 0x3F;
			dataByte = *raw.b++;
		}
		else
			runLength = 1;
	}

	if(pix < pic8+size)
	{
		ri.Printf (PRINT_ALL, "PCX file truncated: %s\n", filename);
		ri.FS_FreeFile (pcx);
		ri.Free (pic8);
	}

	if (raw.b-(byte*)pcx >= end - (byte*)769 || end[-769] != 0x0c)
	{
		ri.Printf (PRINT_ALL, "PCX missing palette: %s\n", filename);
		ri.FS_FreeFile (pcx);
		ri.Free (pic8);
		return;
//.........这里部分代码省略.........

//.........这里部分代码省略.........
								alphabyte = *buf_p++;
								break;
						default:
							ri.Error( ERR_DROP, "LoadTGA: illegal pixel_size '%d' in file '%s'", targa_header.pixel_size, name );
							break;
					}
	
					for(j=0;j<packetSize;j++) {
						*pixbuf++=red;
						*pixbuf++=green;
						*pixbuf++=blue;
						*pixbuf++=alphabyte;
						column++;
						if (column==columns) { // run spans across rows
							column=0;
							if (row>0)
								row--;
							else
								goto breakOut;
							pixbuf = targa_rgba + row*columns*4;
						}
					}
				}
				else {                            // non run-length packet

					if(buf_p + targa_header.pixel_size/8*packetSize > end)
						ri.Error (ERR_DROP, "LoadTGA: file truncated (%s)", name);
					for(j=0;j<packetSize;j++) {
						switch (targa_header.pixel_size) {
							case 24:
									blue = *buf_p++;
									green = *buf_p++;
									red = *buf_p++;
									*pixbuf++ = red;
									*pixbuf++ = green;
									*pixbuf++ = blue;
									*pixbuf++ = 255;
									break;
							case 32:
									blue = *buf_p++;
									green = *buf_p++;
									red = *buf_p++;
									alphabyte = *buf_p++;
									*pixbuf++ = red;
									*pixbuf++ = green;
									*pixbuf++ = blue;
									*pixbuf++ = alphabyte;
									break;
							default:
								ri.Error( ERR_DROP, "LoadTGA: illegal pixel_size '%d' in file '%s'", targa_header.pixel_size, name );
								break;
						}
						column++;
						if (column==columns) { // pixel packet run spans across rows
							column=0;
							if (row>0)
								row--;
							else
								goto breakOut;
							pixbuf = targa_rgba + row*columns*4;
						}						
					}
				}
			}
			breakOut:;
		}
	}

#if 0 
  // TTimo: this is the chunk of code to ensure a behavior that meets TGA specs 
  // bit 5 set => top-down
  if (targa_header.attributes & 0x20) {
    unsigned char *flip = (unsigned char*)malloc (columns*4);
    unsigned char *src, *dst;

    for (row = 0; row < rows/2; row++) {
      src = targa_rgba + row * 4 * columns;
      dst = targa_rgba + (rows - row - 1) * 4 * columns;

      memcpy (flip, src, columns*4);
      memcpy (src, dst, columns*4);
      memcpy (dst, flip, columns*4);
    }
    free (flip);
  }
#endif
  // instead we just print a warning
  if (targa_header.attributes & 0x20) {
    ri.Printf( PRINT_WARNING, "WARNING: '%s' TGA file header declares top-down image, ignoring\n", name);
  }

  if (width)
	  *width = columns;
  if (height)
	  *height = rows;

  *pic = targa_rgba;

  ri.FS_FreeFile (buffer.v);
}