Method Image.GIF._render_block()
- Method _render_block
string _render_block(int x, int y, int xsize, int ysize, int bpp, string indices, 0|string colortable, int interlace)
- Description
-
Advanced (!) method for writing renderblocks for placement in a GIF file. This method only applies LZW encoding on the indices and makes the correct headers.
- Parameter x
- Parameter y
-
Position of this image.
- Parameter xsize
- Parameter ysize
-
Size of the image. Length if the indices string must be xsize*ysize.
- Parameter bpp
-
Bits per pixels in the indices. Valid range 1..8.
- Parameter indices
-
The image indices as an 8bit indices.
- Parameter colortable
-
Colortable with colors to write as palette. If this argument is zero, no local colortable is written. Colortable string len must be 1<<bpp.
- Parameter interlace
-
Interlace index data and set interlace bit. The given string should _not_ be pre-interlaced.
- Note
-
This is in the very advanced sector of the GIF support; please read about how GIF files works.
- See also