Image2D (object)¶

The Image2D is a base class for image types. The Image2D provides services for sampling images.

参考

Members¶

String	name	The name of the image.
Size	width	the width of the image
Size	height	the height of the image
UInt32	version	the current version number of the image
UInt32	flags	A set of binary flags for the image.
StatisticsAutoRegisterMember	autoStats	A statistics collection member used to track memory usage throughout an application.

/*
** Example: Image2D
*/

require OpenImageIO;
require FileIO;
require Images;

function Boolean loadRGBAImageData(
  String filePath,
  io Image2DRGBA image
) {

  OpenImageInput oiimage = OpenImageInput();
  oiimage.open(filePath);
  if(oiimage.valid()) {
    OpenImageTypeDesc desc = OpenImageTypeDesc(OpenImage_BASETYPE_UINT8, OpenImage_AGGREGATE_SCALAR, OpenImage_VECSEMANTICS_NOXFORM);

    OpenImageSpec spec = oiimage.spec();
    image.resize(spec.get_full_width(), spec.get_full_height());
    Boolean success = false;
    if(spec.get_nchannels() == 4) {
      Data data = image.pixels.data();
      success = oiimage.read_image(desc, data, 0, 0, 0);
    } else if(spec.get_nchannels() == 3) {
      image.resize(image.width, image.height);
      Byte bytes[];
      bytes.resize(image.width * image.height * spec.get_nchannels());
      Data data = bytes.data();
      success = oiimage.read_image(desc, data, 0, 0, 0);
      if(success) {
        Size offset = 0;
        for(Size i=0;i< image.pixels.size();i++) {
          image.pixels[i].r = bytes[offset++];
          image.pixels[i].g = bytes[offset++];
          image.pixels[i].b = bytes[offset++];
          image.pixels[i].a = 255;
        }
      }
    }
    if(!success) {
      setError("Image2D '"+filePath+"' could not be converted to RGBA.");
    }
  }
  else {
    setError("Image2D '"+filePath+"' could not be opened!");
    return false;
  }
  return true;
}

operator entry() {

  FilePath inputPath = FilePath('${FABRIC_SCENE_GRAPH_DIR}/Python/Apps/Resources/Images/logo.png').expandEnvVars();

  Image2DRGBA image();
  loadRGBAImageData(inputPath.string(), image);

  // report some pixel
  for(Size i=1;i<5;i++)
    for(Size j=1;j<5;j++)
      report(image.sample(Scalar(i)/5.0, Scalar(j)/5.0));
}

/*
** Output:

{r:0,g:0,b:0,a:0}
{r:39,g:168,b:223,a:255}
{r:39,g:168,b:223,a:255}
{r:0,g:0,b:0,a:0}
{r:39,g:168,b:223,a:255}
{r:39,g:168,b:223,a:255}
{r:39,g:168,b:223,a:255}
{r:39,g:168,b:223,a:255}
{r:39,g:168,b:223,a:255}
{r:0,g:0,b:0,a:0}
{r:39,g:168,b:223,a:255}
{r:39,g:168,b:223,a:255}
{r:0,g:0,b:0,a:0}
{r:39,g:168,b:223,a:255}
{r:39,g:168,b:223,a:255}
{r:0,g:0,b:0,a:0}

*/