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image.c animation touchups

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* image.c (imagemagick_compute_animated_image): Animate correctly
when sub-images are smaller than the main image.
This commit is contained in:
Lars Magne Ingebrigtsen 2013-08-15 20:34:23 +02:00
parent 63216c5ee1
commit 703dbebab0
2 changed files with 36 additions and 2 deletions
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5
src/ChangeLog
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@ -1,3 +1,8 @@
2013-08-15 Lars Magne Ingebrigtsen <larsi@gnus.org>
* image.c (imagemagick_compute_animated_image): Animate correctly
when sub-images are smaller than the main image.
2013-08-15 Jan Djärv <jan.h.d@swipnet.se>
* nsmenu.m (menuWillOpen:): Fix preprocessor test (Bug#15001).

33
src/image.c
View file

@ -7879,6 +7879,7 @@ imagemagick_compute_animated_image (MagickWand *super_wand, int ino)
{
int i;
MagickWand *composite_wand;
size_t dest_width, dest_height;
MagickSetIteratorIndex (super_wand, 0);
@ -7887,18 +7888,36 @@ imagemagick_compute_animated_image (MagickWand *super_wand, int ino)
else
composite_wand = animation_cache;
dest_width = MagickGetImageWidth (composite_wand);
dest_height = MagickGetImageHeight (composite_wand);
for (i = max (1, animation_index + 1); i <= ino; i++)
{
MagickWand *sub_wand;
PixelIterator *source_iterator, *dest_iterator;
PixelWand **source, **dest;
size_t source_width, dest_width;
size_t source_width, source_height;
ssize_t source_left, source_top;
MagickPixelPacket pixel;
DisposeType dispose;
MagickSetIteratorIndex (super_wand, i);
sub_wand = MagickGetImage (super_wand);
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);
@ -7906,6 +7925,7 @@ imagemagick_compute_animated_image (MagickWand *super_wand, int ino)
{
DestroyMagickWand (composite_wand);
DestroyMagickWand (sub_wand);
animation_cache = NULL;
image_error ("Imagemagick pixel iterator creation failed",
Qnil, Qnil);
return NULL;
@ -7917,11 +7937,16 @@ imagemagick_compute_animated_image (MagickWand *super_wand, int ino)
DestroyMagickWand (composite_wand);
DestroyMagickWand (sub_wand);
DestroyPixelIterator (source_iterator);
animation_cache = NULL;
image_error ("Imagemagick pixel iterator creation failed",
Qnil, Qnil);
return NULL;
}
/* The sub-image may not start at origo, so move the destination
iterator to where the sub-image should start. */
PixelSetIteratorRow (dest_iterator, source_top);
while ((source = PixelGetNextIteratorRow (source_iterator, &source_width))
!= NULL)
{
@ -7929,6 +7954,10 @@ imagemagick_compute_animated_image (MagickWand *super_wand, int ino)
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. */
if (x + source_left > dest_width)
break;
/* Normally we only copy over non-transparent pixels,
but if the disposal method is "Background", then we
copy over all pixels. */
@ -7936,7 +7965,7 @@ imagemagick_compute_animated_image (MagickWand *super_wand, int ino)
PixelGetAlpha (source[x]))
{
PixelGetMagickColor (source[x], &pixel);
PixelSetMagickColor (dest[x], &pixel);
PixelSetMagickColor (dest[x + source_left], &pixel);
}
}
PixelSyncIterator(dest_iterator);