From: Damian Yerrick <Bullcr_pd_yerrick AT hotmail DOT comRemoveBullcr_p>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: WHAT'S GOING ON!!??!?!!
Organization: Pin Eight Software  http://pineight.8m.com/
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NNTP-Posting-Date: Fri, 25 Aug 2000 07:42:20 GMT
Distribution: world
Date: Fri, 25 Aug 2000 07:42:20 GMT
To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp
Reply-To: djgpp AT delorie DOT com

On Wed, 23 Aug 2000 23:02:50 -0700 (PDT), Chris Amos
<homie_dont_play_dat AT yahoo DOT com> wrote:

>> >  set_gfx_mode(GFX_AUTODETECT,640, 480,0,0);
>> >  set_color_depth(16);
>> >  bmp = load_bitmap("Tile1.bmp", pal);
>> >  draw_sprite(screen, bmp, 0, 0);
>>
>> You get weird colored garbage because you're not drawing with the
>> right palette.  Also, if you're putting multiple images on one
>> 256-color screen, make sure they have the same palette.
>
>What are you talking about? There are no Palettes in 16 bit mode.

But you're not running in 16-bit mode.  Because you set the color
depth after you set the graphics mode, you're running in the default
8-bit mode.

>The pics are 24 bit, so shouldnt the Allegro routines
>automaticly convert the pic to 16 bits per pixel?

It's automatically converting to 8 bits per pixel in a "332" (8 levels
red, 8 levels green, 4 levels blue) palette.  Because you're in 8-bit
mode and have not set the palette to the 332 palette returned by
load_bitmap(), you're getting funky colors.

To solve the problem, move set_color_depth() above set_gfx_mode.  And
make sure the output from set_gfx_mode() is non-negative; if it's
negative, Allegro couldn't find a suitable graphics mode, the display
is still in text mode, and any attempts to draw to `screen' will cause
a SIGSEGV.

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