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(imagemagick_compute_animated_image): Allow certain degenerate images

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(imagemagick_compute_animated_image): Allow images that say they
have sub-images that are bigger than the main image, but just crop
them.
This commit is contained in:
Lars Magne Ingebrigtsen 2013-08-15 21:46:02 +02:00
parent 1d18b1e6ab
commit 7967001450
2 changed files with 15 additions and 13 deletions
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3
src/ChangeLog
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@ -4,6 +4,9 @@
when sub-images are smaller than the main image.
(imagemagick_compute_animated_image): Setting the iterator row to
zero is apparently not allowed.
(imagemagick_compute_animated_image): Allow images that say they
have sub-images that are bigger than the main image, but just crop
them.
2013-08-15 Jan Djärv <jan.h.d@swipnet.se>

25
src/image.c
View file

@ -7900,6 +7900,7 @@ imagemagick_compute_animated_image (MagickWand *super_wand, int ino)
ssize_t source_left, source_top;
MagickPixelPacket pixel;
DisposeType dispose;
ptrdiff_t lines = 0;
MagickSetIteratorIndex (super_wand, i);
sub_wand = MagickGetImage (super_wand);
@ -7907,17 +7908,6 @@ imagemagick_compute_animated_image (MagickWand *super_wand, int ino)
MagickGetImagePage (sub_wand, &source_width, &source_height,
&source_left, &source_top);
/* Sanity check. The sub-image should not be bigger than the
base image. */
if (source_height + source_top > dest_height)
{
DestroyMagickWand (composite_wand);
DestroyMagickWand (sub_wand);
animation_cache = NULL;
image_error ("Inconsinstent animation size", Qnil, Qnil);
return NULL;
}
dispose = MagickGetImageDispose (sub_wand);
source_iterator = NewPixelIterator (sub_wand);
@ -7946,17 +7936,26 @@ imagemagick_compute_animated_image (MagickWand *super_wand, int ino)
/* The sub-image may not start at origo, so move the destination
iterator to where the sub-image should start. */
if (source_top > 0)
PixelSetIteratorRow (dest_iterator, source_top);
{
PixelSetIteratorRow (dest_iterator, source_top);
lines = source_top;
}
while ((source = PixelGetNextIteratorRow (source_iterator, &source_width))
!= NULL)
{
ptrdiff_t x;
/* Sanity check. This shouldn't happen, but apparently
does in some pictures. */
if (++lines >= dest_height)
break;
dest = PixelGetNextIteratorRow (dest_iterator, &dest_width);
for (x = 0; x < source_width; x++)
{
/* Sanity check. This shouldn't happen, but apparently
does in some pictures. */
also does in some pictures. */
if (x + source_left > dest_width)
break;
/* Normally we only copy over non-transparent pixels,