Class: Depth64Image

• Inheritance
• Description
• Class protocol
  • queries
• Instance protocol
  • accessing-pixels
  • initialization
  • queries

Inheritance:

   Object
   |
   +--Image
      |
      +--Depth64Image

Package:

stx:libview

Category:

Graphics-Images

Version:

rev: 1.14 date: 2021/08/26 18:13:02

user: cg

file: Depth64Image.st directory: libview

module: stx stc-classLibrary: libview

Description:

this class represents 64 bit images as possibly provided by png 4x16bit rgba images.
Such images are normally not used in real world applications, as humans cannot differentiate 
more than roughly 200 distinct color tone values. However, in image processing (false-color) applications,
such a fine grain image makes sense and is sometimes used.

For now, the rest of the system (for example, the image editor) cannot really deal with
such images. So some work may be required in the future.

copyright
COPYRIGHT (c) 2009 by eXept Software AG
             All Rights Reserved

This software is furnished under a license and may be used
only in accordance with the terms of that license and with the
inclusion of the above copyright notice.   This software may not
be provided or otherwise made available to, or used by, any
other person.  No title to or ownership of the software is
hereby transferred.

Class protocol:

 defaultPhotometric

return the default photometric pixel interpretation

 imageDepth

return the depth of images represented by instances of
this class - here we return 64

Instance protocol:

 pixelAtX: x y: y

retrieve a pixel at x/y; return a pixelValue.
The interpretation of the returned value depends on the photometric
and the colormap. See also Image>>atX:y:)
Pixels start at x=0 , y=0 for upper left pixel, end at
x = width-1, y=height-1 for lower right pixel.
The pixel value contains r/g/b/a in msb order (i.e. r at high, a at low bits)

 pixelAtX: x y: y put: aPixelValue

set the pixel at x/y to aPixelValue.
The interpretation of the pixelValue depends on the photometric
and the colormap. (see also: Image>>atX:y:put:)
Pixels start at x=0 , y=0 for upper left pixel, end at
x = width-1, y=height-1 for lower right pixel

 initialize

 bitsPerPixel

return the number of bits per pixel

 bitsPerRow

return the number of bits in one scanline of the image

 bytesPerRow

return the number of bytes in one scanline of the image

 hasAlphaChannel