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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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src/add-ons/screen_savers/nebula/DrawStars.c
+17 -22
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@@ -1,68 +1,63 @@
// Hand-translated from x86 assembly. // 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) */ /* 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* dst;
unsigned char inc; unsigned char inc;
dst = (unsigned char*)dstParam; dst = (unsigned char*)dstParam;
inc = (unsigned char)incParam; inc = (unsigned char)incParam;
dst[STAR_WIDTH] += inc; dst[star_width] += inc;
if (dst[STAR_WIDTH] < inc) { if (dst[star_width] < inc) {
// Overflowed. // Overflowed.
dst[STAR_WIDTH] = 255; dst[star_width] = 255;
} }
inc >>= 1; inc >>= 1;
unsigned char al; unsigned char al;
al = *dst; al = *dst;
unsigned char cl; unsigned char cl;
cl = dst[STAR_WIDTH - 1]; cl = dst[star_width - 1];
al += inc; al += inc;
if (al >= inc) { if (al >= inc) {
cl += inc; cl += inc;
if (cl < inc) { if (cl < inc) {
*dst = 255; *dst = 255;
dst[STAR_WIDTH - 1] = 255; dst[star_width - 1] = 255;
} else { } else {
*dst = al; *dst = al;
dst[STAR_WIDTH - 1] = cl; dst[star_width - 1] = cl;
} }
} else { } else {
cl += inc; cl += inc;
if (cl < inc) { if (cl < inc) {
*dst = 255; *dst = 255;
dst[STAR_WIDTH - 1] = 255; dst[star_width - 1] = 255;
} else { } else {
*dst = 255; *dst = 255;
dst[STAR_WIDTH - 1] = cl; dst[star_width - 1] = cl;
} }
} }
al = dst[STAR_WIDTH * 2]; al = dst[star_width * 2];
cl = dst[STAR_WIDTH + 1]; cl = dst[star_width + 1];
al += inc; al += inc;
if (al < inc) { if (al < inc) {
cl += inc; cl += inc;
if (cl >= inc) { if (cl >= inc) {
dst[STAR_WIDTH * 2] = 255; dst[star_width * 2] = 255;
dst[STAR_WIDTH + 1] = cl; dst[star_width + 1] = cl;
return; return;
} }
} else { } else {
cl += inc; cl += inc;
if (cl >= inc) { if (cl >= inc) {
dst[STAR_WIDTH * 2] = al; dst[star_width * 2] = al;
dst[STAR_WIDTH + 1] = cl; dst[star_width + 1] = cl;
return; return;
} }
} }
dst[STAR_WIDTH * 2] = 255; dst[star_width * 2] = 255;
dst[STAR_WIDTH + 1] = 255; dst[star_width + 1] = 255;
} }