C++ refimport_t::Malloc方法代码示例

//.........这里部分代码省略.........
   * 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;

  // Expand from RGB to RGBA
  sindex = pixelcount * cinfo.output_components;
  dindex = memcount;

  do
  {	
    buf[--dindex] = 255;
    buf[--dindex] = buf[--sindex];
    buf[--dindex] = buf[--sindex];
    buf[--dindex] = buf[--sindex];
  } while(sindex);

  *pic = out;

  /* Step 7: Finish decompression */

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

  /* Step 8: Release JPEG decompression object */

  /* This is an important step since it will release a good deal of memory. */
  jpeg_destroy_decompress(&cinfo);

  /* After finish_decompress, we can close the input file.
   * Here we postpone it until after no more JPEG errors are possible,
   * so as to simplify the setjmp error logic above.  (Actually, I don't
   * think that jpeg_destroy can do an error exit, but why assume anything...)
   */
  ri.FS_FreeFile (fbuffer.v);

  /* At this point you may want to check to see whether any corrupt-data
   * warnings occurred (test whether jerr.pub.num_warnings is nonzero).
   */

  /* And we're done! */
}

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.........

void R_LoadTGA ( const char *name, byte **pic, int *width, int *height)
{
	unsigned	columns, rows, numPixels;
	byte	*pixbuf;
	int		row, column;
	byte	*buf_p;
	byte	*end;
	union {
		byte *b;
		void *v;
	} buffer;
	TargaHeader	targa_header;
	byte		*targa_rgba;
	int length;

	*pic = NULL;

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

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

	if(length < 18)
	{
		ri.Error( ERR_DROP, "LoadTGA: header too short (%s)", name );
	}

	buf_p = buffer.b;
	end = buffer.b + length;

	targa_header.id_length = buf_p[0];
	targa_header.colormap_type = buf_p[1];
	targa_header.image_type = buf_p[2];
	
	memcpy(&targa_header.colormap_index, &buf_p[3], 2);
	memcpy(&targa_header.colormap_length, &buf_p[5], 2);
	targa_header.colormap_size = buf_p[7];
	memcpy(&targa_header.x_origin, &buf_p[8], 2);
	memcpy(&targa_header.y_origin, &buf_p[10], 2);
	memcpy(&targa_header.width, &buf_p[12], 2);
	memcpy(&targa_header.height, &buf_p[14], 2);
	targa_header.pixel_size = buf_p[16];
	targa_header.attributes = buf_p[17];

	targa_header.colormap_index = LittleShort(targa_header.colormap_index);
	targa_header.colormap_length = LittleShort(targa_header.colormap_length);
	targa_header.x_origin = LittleShort(targa_header.x_origin);
	targa_header.y_origin = LittleShort(targa_header.y_origin);
	targa_header.width = LittleShort(targa_header.width);
	targa_header.height = LittleShort(targa_header.height);

	buf_p += 18;

	if (targa_header.image_type!=2 
		&& targa_header.image_type!=10
		&& targa_header.image_type != 3 ) 
	{
		ri.Error (ERR_DROP, "LoadTGA: Only type 2 (RGB), 3 (gray), and 10 (RGB) TGA images supported");
	}

	if ( targa_header.colormap_type != 0 )
	{
		ri.Error( ERR_DROP, "LoadTGA: colormaps not supported" );
	}

	if ( ( targa_header.pixel_size != 32 && targa_header.pixel_size != 24 ) && targa_header.image_type != 3 )
	{
		ri.Error (ERR_DROP, "LoadTGA: Only 32 or 24 bit images supported (no colormaps)");
	}

	columns = targa_header.width;
	rows = targa_header.height;
	numPixels = columns * rows * 4;

	if(!columns || !rows || numPixels > 0x7FFFFFFF || numPixels / columns / 4 != rows)
	{
		ri.Error (ERR_DROP, "LoadTGA: %s has an invalid image size", name);
	}


	targa_rgba = ri.Malloc (numPixels);

	if (targa_header.id_length != 0)
	{
		if (buf_p + targa_header.id_length > end)
			ri.Error( ERR_DROP, "LoadTGA: header too short (%s)", name );

		buf_p += targa_header.id_length;  // skip TARGA image comment
	}
	
	if ( targa_header.image_type==2 || targa_header.image_type == 3 )
	{ 
//.........这里部分代码省略.........