[SDL] Displaying data array

[Ed Keith]

256 colors will be fine. the image is two colors fully
saturates. So each pixel will be in one of 4 states;
red, blue, magenta, or black.

I'll give this a try.

thanks,

   -EdK


--- Ken Rogoway <Ken at HomebrewSoftware.com> wrote:

> 
> You can create a surface (texture) that has a 24 bit
> format (RGB) and then
> lock it.  You can then write the data 3 bytes at a
> time (each triple
> representing an RGB value).  You will need to
> account for the actual byte
> width of the surface when advancing to the next row
> since there can be pad
> bytes at the end of a row.
> 
> Once you have done this you can unlock the surface,
> then blit it to the
> screen or save it to file.  This is about as fast as
> you will get.  The only
> other thing you can do is if your data doesn't need
> 24 bits of color to
> represent it and you can display it with 256 colors
> you can do the same
> thing as above, but write out a byte at a type to
> represent a single pixel.
> In that case you would create a 8 bit (paletted)
> surface.
> 
> Ken Rogoway
> Homebrew Software
> http://www.homebrewsoftware.com/
>  
> 
> -----Original Message-----
> From: sdl-bounces at lists.libsdl.org
> [mailto:sdl-bounces at lists.libsdl.org] On
> Behalf Of Ed Keith
> Sent: Friday, March 21, 2008 11:26 AM
> To: sdl at lists.libsdl.org
> Subject: [SDL] Displaying data array
> 
> I have an array of data in memory that I want to
> display as an image. I can
> think of two ways of doing this, but do not like
> either one.
> 
> I could write the array to the screen pixel by
> pixel.
> I suspect this will be very slow.
> 
> I could write the data to a bit map file and read
> the file into the display.
> I do not like all this unnecessary disk access.
> 
> Can anyone suggest a better way?
> 
> thank you,
> 
>    -EdK
> 
> Ed Keith
> e_d_k at yahoo.com
> 
> Blog: edkeith.blogspot.com
> 
> 
>  
>
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Ed Keith
e_d_k at yahoo.com

Blog: edkeith.blogspot.com


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