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app: use GeglBufferIterator in gimp_channel_real_is_empty()

This commit is contained in:
Michael Natterer 2012-03-17 00:06:04 +01:00
parent fd579343df
commit 410d6405d6
1 changed files with 15 additions and 18 deletions
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33
app/core/gimpchannel.c
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@ -1195,34 +1195,31 @@ gimp_channel_real_bounds (GimpChannel *channel,
static gboolean
gimp_channel_real_is_empty (GimpChannel *channel)
{
PixelRegion maskPR;
guchar *data;
gint x, y;
gpointer pr;
GeglBuffer *buffer;
GeglBufferIterator *iter;
if (channel->bounds_known)
return channel->empty;
pixel_region_init (&maskPR,
gimp_drawable_get_tiles (GIMP_DRAWABLE (channel)),
0, 0,
gimp_item_get_width (GIMP_ITEM (channel)),
gimp_item_get_height (GIMP_ITEM (channel)), FALSE);
buffer = gimp_drawable_get_read_buffer (GIMP_DRAWABLE (channel));
for (pr = pixel_regions_register (1, &maskPR);
pr != NULL;
pr = pixel_regions_process (pr))
iter = gegl_buffer_iterator_new (buffer, NULL, babl_format ("Y u8"),
GEGL_BUFFER_READ);
while (gegl_buffer_iterator_next (iter))
{
/* check if any pixel in the channel is non-zero */
data = maskPR.data;
guchar *data = iter->data[0];
gint i;
for (y = 0; y < maskPR.h; y++)
for (x = 0; x < maskPR.w; x++)
if (*data++)
for (i = 0; i < iter->length; i++)
{
if (data[i])
{
pixel_regions_process_stop (pr);
gegl_buffer_iterator_stop (iter);
return FALSE;
}
}
}
/* The mask is empty, meaning we can set the bounds as known */