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screen_savers/Nebula: Rename variable in DrawStars.c.

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Lots of cleanup here still needed, but it's OK for now.
This commit is contained in:
Augustin Cavalier 2015-07-07 20:06:29 -04:00
parent d3a89219a7
commit 35c984142e
1 changed files with 17 additions and 22 deletions
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39
src/add-ons/screen_savers/nebula/DrawStars.c
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@ -1,68 +1,63 @@
// Hand-translated from x86 assembly.
/* this function needs a definition from outside (the width of the bitmap) */
// #define STAR_WIDTH 320
// #define STAR_FUNCTION draw_stars320
/* draw a star (5 pixels) */
void draw_stars(int STAR_WIDTH, char* dstParam, char incParam)
void draw_stars(int star_width, char* dstParam, char incParam)
{
unsigned char* dst;
unsigned char inc;
dst = (unsigned char*)dstParam;
inc = (unsigned char)incParam;
dst[STAR_WIDTH] += inc;
if (dst[STAR_WIDTH] < inc) {
dst[star_width] += inc;
if (dst[star_width] < inc) {
// Overflowed.
dst[STAR_WIDTH] = 255;
dst[star_width] = 255;
}
inc >>= 1;
unsigned char al;
al = *dst;
unsigned char cl;
cl = dst[STAR_WIDTH - 1];
cl = dst[star_width - 1];
al += inc;
if (al >= inc) {
cl += inc;
if (cl < inc) {
*dst = 255;
dst[STAR_WIDTH - 1] = 255;
dst[star_width - 1] = 255;
} else {
*dst = al;
dst[STAR_WIDTH - 1] = cl;
dst[star_width - 1] = cl;
}
} else {
cl += inc;
if (cl < inc) {
*dst = 255;
dst[STAR_WIDTH - 1] = 255;
dst[star_width - 1] = 255;
} else {
*dst = 255;
dst[STAR_WIDTH - 1] = cl;
dst[star_width - 1] = cl;
}
}
al = dst[STAR_WIDTH * 2];
cl = dst[STAR_WIDTH + 1];
al = dst[star_width * 2];
cl = dst[star_width + 1];
al += inc;
if (al < inc) {
cl += inc;
if (cl >= inc) {
dst[STAR_WIDTH * 2] = 255;
dst[STAR_WIDTH + 1] = cl;
dst[star_width * 2] = 255;
dst[star_width + 1] = cl;
return;
}
} else {
cl += inc;
if (cl >= inc) {
dst[STAR_WIDTH * 2] = al;
dst[STAR_WIDTH + 1] = cl;
dst[star_width * 2] = al;
dst[star_width + 1] = cl;
return;
}
}
dst[STAR_WIDTH * 2] = 255;
dst[STAR_WIDTH + 1] = 255;
dst[star_width * 2] = 255;
dst[star_width + 1] = 255;
}