Hi Hazen: The original 'mem' driver plotted into an unsigned char array with size 3 x height x width (thus no alpha channel). The cairo drivers plot into 32 bit RGB arrays (with an alpha channel). For the memcairo driver (as a first cut), I just copied in the 24 bits of RGB info into the 32 bit RGB/alpha words, leaving the alpha channel 0. When cairo is done with its magic, the 32bit RGB/alpha words are copied back into a 24 bit RGB array.
I'd like to figure out how to get my graphics package to work with an alpha channel and add an option to pass in 32 bit RGB/alpha words. Regards, Doug [EMAIL PROTECTED] Software Engineer III UCAR - COSMIC, Tel. (303) 497-2611 On Wed, 12 Mar 2008, Hazen Babcock wrote: > > On Mar 12, 2008, at 11:34 AM, Doug Hunt wrote: > >> Hi again, Hazen, all: I just noticed that the patch I sent contains a bug. >> I used malloc where I ought to have used calloc in one place. >> >> Would it be possible for me to get SVN access so I can just fix this >> myself? I'd also like to look into the possibility of adding optional >> alpha channel support for the memcairo driver in the future. > > memcairo doesn't already have alpha channel support? All the other cairo > drivers do since they use shared drawing functions. > > I'll defer your question re SVN access to one of the project administrators, > though I suspect that it won't be a problem. > > -Hazen ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ Plplot-devel mailing list Plplot-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/plplot-devel
