[GRASS-dev] Re: [GRASS GIS] #937: cairo driver: d.legend colors all
broken
GRASS GIS
trac at osgeo.org
Tue Feb 16 05:17:33 EST 2010
#937: cairo driver: d.legend colors all broken
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Reporter: hamish | Owner: grass-dev at lists.osgeo.org
Type: defect | Status: closed
Priority: major | Milestone: 7.0.0
Component: Display | Version: svn-trunk
Resolution: fixed | Keywords: cairo, d.legend
Platform: Linux | Cpu: x86-64
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Comment (by glynn):
Replying to [comment:5 hamish]:
> just out of curiosity, how do the .bmp, .ppm, and SGi's .rgb differ, in
that IIUC they are all just raw binary dumps of width height r1g1b1 r2g2b2
r3g3b3 ...
PPM has a variable length header (where the header length is determined by
parsing), followed by 24-bpp RGB data. BMP has a variable-length header
(where the length is stored in the header) followed by data in a variety
of possible formats. RGB has a fixed-size (512 byte) header followed by
data in a variety of possible formats.
PPM was ruled out because it doesn't support 32-bpp data. BMP was the next
candidate due to having the documentation immediately to hand. Any format
which supports raw 32-bpp RGBA data (with suitable alignment) would work.
--
Ticket URL: <https://trac.osgeo.org/grass/ticket/937#comment:6>
GRASS GIS <http://grass.osgeo.org>
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