Class: TargaReader

• Inheritance
• Description
• Related information
• Class protocol
  • initialization
  • testing
• Instance protocol
  • private-reading
  • reading

Inheritance:

   Object
   |
   +--ImageReader
      |
      +--TargaReader

Package:

stx:libview2

Category:

Graphics-Images-Readers

Version:

rev: 1.25 date: 2003-11-19 15:38:53

user: cg

file: TargaReader.st directory: libview2

module: stx stc-classLibrary: libview2

Description:

this class provides methods for loading targa-file (tga) images.

Limitations: 
    not fully tested (I only had a few targa files to check things)
    only supports 8,24 and 32 bits/pixel formats; alpha channel is ignored
    Image saving not supported

I had two tga files to test this code with - it may not work with
other targa files (it certainly does not work with 1/16 bit images).

Suggestions: adapt & use the pbmplus library here.

Related information:

    Image
    Form
    Icon
    BlitImageReader
    FaceReader
    GIFReader
    JPEGReader
    PBMReader
    PCXReader
    ST80FormReader
    SunRasterReader
    TIFFReader
    WindowsIconReader
    XBMReader
    XPMReader
    XWDReader

Class protocol:

 initialize

tell Image-class, that a new fileReader is present
for the '.tga' extension.

 isValidImageFile: aFileName

return true, if aFileName contains a targa-file image

Instance protocol:

 handleImageOrientation

 read24

read a 24 bit/pixel targa-image

 read24RLE

read an 8 bit/pixel rle encoded targa-image

 read32

read a 32 bit/pixel targa-image; skip alpha channel (for now)

 read32RLE

read a 32 bit/pixel rle encoded targa-image; skip alpha channel (for now)

 read8

read an 8 bit/pixel targa-image

 read8RLE

read an 8 bit/pixel rle encoded targa-image

 readColorMap: cmapLength

 readImage

read a targa-image from aFileName. return the receiver (with all
relevant instance variables set for the image) or nil on error