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fbsplash: limit progress bar flicker

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Progress bar updates flicker quite a bit on slow hw / high resolutions
as the background is completely cleared before the new progress bar
position is drawn on top.

Improve it by first drawing the progress bar and then only fill the
remaining rows with the background.

function                                             old     new   delta
fb_drawprogressbar                                   444     429     -15

Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Peter Korsgaard
2011-10-17 04:35:23 +02:00
committed by Denys Vlasenko
parent 4c77ad75b1
commit e4fa7b7965
1 changed files with 19 additions and 11 deletions
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30
miscutils/fbsplash.c
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@@ -213,14 +213,15 @@ static void fb_drawfullrectangle(int nx1pos, int ny1pos, int nx2pos, int ny2pos,
*/
static void fb_drawprogressbar(unsigned percent)
{
int i, left_x, top_y, width, height;
int left_x, top_y, pos_x;
unsigned width, height;
// outer box
left_x = G.nbar_posx;
top_y = G.nbar_posy;
width = G.nbar_width - 1;
height = G.nbar_height - 1;
if ((height | width) < 0)
if ((int)(height | width) < 0)
return;
// NB: "width" of 1 actually makes rect with width of 2!
fb_drawrectangle();
@@ -230,30 +231,37 @@ static void fb_drawprogressbar(unsigned percent)
top_y++;
width -= 2;
height -= 2;
if ((height | width) < 0)
if ((int)(height | width) < 0)
return;
fb_drawfullrectangle(
left_x, top_y,
left_x + width, top_y + height,
G.nbar_colr, G.nbar_colg, G.nbar_colb);
pos_x = left_x;
if (percent > 0) {
int y;
unsigned i;
// actual progress bar
width = width * percent / 100;
pos_x += (unsigned)(width * percent) / 100;
y = top_y;
i = height;
if (height == 0)
height++; // divide by 0 is bad
while (i >= 0) {
// draw one-line thick "rectangle"
// top line will have gray lvl 200, bottom one 100
unsigned gray_level = 100 + i*100/height;
unsigned gray_level = 100 + i*100 / height;
fb_drawfullrectangle(
left_x, top_y, left_x + width, top_y,
left_x, y, pos_x, y,
gray_level, gray_level, gray_level);
top_y++;
y++;
i--;
}
}
fb_drawfullrectangle(
pos_x, top_y,
left_x + width, top_y + height,
G.nbar_colr, G.nbar_colg, G.nbar_colb);
}