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backport r24377 and r24378

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mandelbrot color fixes for greyscale targets


git-svn-id: svn://svn.rockbox.org/rockbox/branches/v3_5@24379 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Rafaël Carré 2010-01-30 08:39:02 +00:00
parent 984c17bee9
commit 5cda26f9fb
1 changed files with 5 additions and 3 deletions
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8
apps/plugins/fractals/mandelbrot_set.c
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@ -31,14 +31,16 @@ static unsigned char imgbuffer[LCD_HEIGHT];
static fb_data imgbuffer[LCD_HEIGHT];
#endif
#define NUM_COLORS ((unsigned)(1 << LCD_DEPTH))
#ifdef USEGSLIB
#define LCOLOR(iter) ((iter ^ 7) << 5)
#else
/*
* Spread iter's colors over color range.
* 345 (=15*26-45) is max_iter maximal value
* This implementation ignores pixel format, thus it is not uniformly spread
*/
#define LCOLOR(iter) ((iter * NUM_COLORS) / 345)
#define LCOLOR(iter) ((iter << LCD_DEPTH) / 345)
#endif
#ifdef HAVE_LCD_COLOR
#define COLOR(iter) (fb_data)LCOLOR(iter)