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imageviewer: gif viewer based on giflib-5.0.2

Browse source 
This adds ability to view gif images in rockbox.
Works both on color and gray/monochrome targets (greylib).
Aspect correction is supported as well.

Limitations:
- animated gifs are restricted to 32 frames
- animated gifs loop always (loopcount is ignored)
- plain text extension is not supported
- animated gifs with interframe delay = 0 are treated as still
  images (web browsers usually treat delay 0 as 100ms to prevent
  exhaustive CPU load by such images)

Change-Id: I61501f801ddcd403410e38d83e6bddc9883e7ede
This commit is contained in:
Marcin Bukat 2012-11-02 13:03:58 +01:00
parent b35f82c91f
commit 0ceaff2b65
23 changed files with 3006 additions and 15 deletions
Download patch file Download diff file Expand all files Collapse all files

64
apps/plugins/imageviewer/imageviewer.c
View file

@ -550,17 +550,38 @@ static void pan_view_down(struct image_info *info)
/* interactively scroll around the image */
static int scroll_bmp(struct image_info *info)
{
static long ss_timeout = 0;
int button;
#if defined(IMGVIEW_ZOOM_PRE) || defined(IMGVIEW_MENU_PRE)
int lastbutton = BUTTON_NONE;
#endif
if (!ss_timeout && iv_api.slideshow_enabled)
ss_timeout = *rb->current_tick + settings.ss_timeout * HZ;
while (true)
{
if (iv_api.slideshow_enabled)
button = rb->button_get_w_tmo(settings.ss_timeout * HZ);
{
if (info->frames_count > 1 && info->delay &&
settings.ss_timeout * HZ > info->delay)
{
/* animated content and delay between subsequent frames
* is shorter then slideshow delay
*/
button = rb->button_get_w_tmo(info->delay);
}
else
button = rb->button_get_w_tmo(settings.ss_timeout * HZ);
}
else
button = rb->button_get(true);
{
if (info->frames_count > 1 && info->delay)
button = rb->button_get_w_tmo(info->delay);
else
button = rb->button_get(true);
}
iv_api.running_slideshow = false;
@ -595,9 +616,28 @@ static int scroll_bmp(struct image_info *info)
case BUTTON_NONE:
if (iv_api.slideshow_enabled && entries > 1)
{
iv_api.running_slideshow = true;
return change_filename(DIR_NEXT);
if (info->frames_count > 1)
{
/* animations */
if (TIME_AFTER(*rb->current_tick, ss_timeout))
{
iv_api.running_slideshow = true;
ss_timeout = 0;
return change_filename(DIR_NEXT);
}
else
return NEXT_FRAME;
}
else
{
/* still picture */
iv_api.running_slideshow = true;
return change_filename(DIR_NEXT);
}
}
else
return NEXT_FRAME;
break;
#ifdef IMGVIEW_SLIDE_SHOW
@ -838,9 +878,11 @@ static int load_and_show(char* filename, struct image_info *info)
cx = info->x_size/ds/2; /* center the view */
cy = info->y_size/ds/2;
/* used to loop through subimages in animated gifs */
int frame = 0;
do /* loop the image prepare and decoding when zoomed */
{
status = imgdec->get_image(info, ds); /* decode or fetch from cache */
status = imgdec->get_image(info, frame, ds); /* decode or fetch from cache */
if (status == PLUGIN_ERROR)
{
file_pt[curfile] = NULL;
@ -849,7 +891,7 @@ static int load_and_show(char* filename, struct image_info *info)
set_view(info, cx, cy);
if(!iv_api.running_slideshow)
if(!iv_api.running_slideshow && (info->frames_count == 1))
{
rb->lcd_putsf(0, 3, "showing %dx%d", info->width, info->height);
rb->lcd_update();
@ -870,6 +912,7 @@ static int load_and_show(char* filename, struct image_info *info)
while (1)
{
status = scroll_bmp(info);
if (status == ZOOM_IN)
{
if (ds > ds_min || (imgdec->unscaled_avail && ds > 1))
@ -899,16 +942,19 @@ static int load_and_show(char* filename, struct image_info *info)
else
continue;
}
/* next frame in animated content */
if (status == NEXT_FRAME)
frame = (frame + 1)%info->frames_count;
break;
}
#ifdef USEGSLIB
grey_show(false); /* switch off overlay */
#endif
rb->lcd_clear_display();
}
while (status > PLUGIN_OTHER);
#ifdef USEGSLIB
grey_show(false); /* switch off overlay */
rb->lcd_update();
#endif
return status;