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fix FS#9140 by changing stop_scroll so it stops scrolling lines which would overlap the current viewport. This shouldnt cause any problems because when this happens the vp owning the line should redraw when the new vp's screen is exited.

Browse source 
Also fix a potential bug where only one scrolling line in a viewport was stopped


git-svn-id: svn://svn.rockbox.org/rockbox/trunk@17913 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Jonathan Gordon 2008-07-02 09:42:36 +00:00
parent f48cf62558
commit 88055b2f2e
1 changed files with 30 additions and 8 deletions
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34
firmware/scroll_engine.c
View file

@ -84,6 +84,18 @@ void lcd_stop_scroll(void)
lcd_scroll_info.lines = 0;
}
/* returns true if the 'line' in 'lines_vp' would scroll into 'othervp' */
static bool line_overlaps_viewport(struct viewport *lines_vp, int line,
struct viewport *othervp)
{
int y = (font_get(lines_vp->font)->height*line) + lines_vp->y;
if (y < othervp->y || y > othervp->y + othervp->height)
return false;
else if ((lines_vp->x + lines_vp->width < othervp->x) ||
(othervp->x + othervp->width < lines_vp->x))
return false;
return true;
}
/* Stop scrolling line y in the specified viewport, or all lines if y < 0 */
void lcd_scroll_stop_line(struct viewport* current_vp, int y)
{
@ -91,8 +103,11 @@ void lcd_scroll_stop_line(struct viewport* current_vp, int y)
while (i < lcd_scroll_info.lines)
{
if ((lcd_scroll_info.scroll[i].vp == current_vp) &&
((y < 0) || (lcd_scroll_info.scroll[i].y == y)))
if (((lcd_scroll_info.scroll[i].vp == current_vp) &&
((y < 0) || (lcd_scroll_info.scroll[i].y == y))) ||
((lcd_scroll_info.scroll[i].vp != current_vp) &&
line_overlaps_viewport(lcd_scroll_info.scroll[i].vp,
lcd_scroll_info.scroll[i].y, current_vp)))
{
/* If i is not the last active line in the array, then move
the last item to position i */
@ -102,7 +117,9 @@ void lcd_scroll_stop_line(struct viewport* current_vp, int y)
}
lcd_scroll_info.lines--;
/* A line can only appear once, so we're done. */
/* A line can only appear once, so we're done,
* unless we are clearing the whole viewport */
if (y >= 0)
return ;
}
else
@ -165,8 +182,11 @@ void lcd_remote_scroll_stop_line(struct viewport* current_vp, int y)
while (i < lcd_remote_scroll_info.lines)
{
if ((lcd_remote_scroll_info.scroll[i].vp == current_vp) &&
((y < 0) || (lcd_remote_scroll_info.scroll[i].y == y)))
if (((lcd_remote_scroll_info.scroll[i].vp == current_vp) &&
((y < 0) || (lcd_remote_scroll_info.scroll[i].y == y))) ||
(((lcd_remote_scroll_info.scroll[i].vp != current_vp) &&
line_overlaps_viewport(lcd_scroll_info.scroll[i].vp,
lcd_scroll_info.scroll[i].y, current_vp))))
{
/* If i is not the last active line in the array, then move
the last item to position i */
@ -176,7 +196,9 @@ void lcd_remote_scroll_stop_line(struct viewport* current_vp, int y)
}
lcd_remote_scroll_info.lines--;
/* A line can only appear once, so we're done. */
/* A line can only appear once, so we're done,
* unless we are clearing the whole viewport */
if (y >= 0)
return ;
}
else