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scrollbar(): Code size optimisation; fixed overflow with large parameters (fixes seek position display in video.rock with large files).

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@5566 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Jens Arnold 2005-01-16 00:14:55 +00:00
parent 4666f7e0d9
commit 166f7a2fe0
1 changed files with 29 additions and 32 deletions
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53
apps/recorder/widgets.c
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@ -17,6 +17,7 @@
*
****************************************************************************/
#include <lcd.h>
#include <limits.h>
#include "widgets.h"
@ -42,6 +43,7 @@ void scrollbar(int x, int y, int width, int height, int items, int min_shown,
{
int min;
int max;
int inner_len;
int start;
int size;
@ -82,43 +84,38 @@ void scrollbar(int x, int y, int width, int height, int items, int min_shown,
if(max > items)
max = items;
/* calc start and end of the knob */
if(items > 0 && items > (max - min)) {
if(orientation == VERTICAL) {
size = (height - 2) * (max - min) / items;
start = (height - 2 - size) * min / (items - (max - min));
}
else {
size = (width - 2) * (max - min) / items;
start = (width - 2 - size) * min / (items - (max - min));
}
}
else { /* if null draw a full bar */
start = 0;
if (orientation == VERTICAL)
size = (height - 2);
inner_len = height - 2;
else
size = (width - 2);
inner_len = width - 2;
/* avoid overflows */
while (items > (INT_MAX / inner_len)) {
items >>= 1;
min >>= 1;
max >>= 1;
}
/* calc start and end of the knob */
if(items > 0 && items > (max - min)) {
size = inner_len * (max - min) / items;
start = (inner_len - size) * min / (items - (max - min));
}
else { /* if null draw a full bar */
size = inner_len;
start = 0;
}
/* width of knob is null */
if(size == 0) {
start = (inner_len - 1) * min / items;
size = 1;
}
/* knob has a width */
if(size != 0) {
if(orientation == VERTICAL)
lcd_fillrect(x + 1, y + start + 1, width - 2, size);
else
lcd_fillrect(x + start + 1, y + 1, size, height - 2);
}
else { /* width of knob is null */
if(orientation == VERTICAL) {
start = (height - 2 - 1) * min / items;
lcd_fillrect(x + 1, y + start + 1, width - 2, 1);
}
else {
start = (width - 2 - 1) * min / items;
lcd_fillrect(x + start + 1, y + 1, 1, height - 2);
}
}
}
/*
* Print a checkbox