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revise change detection again

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to fix debug output
This commit is contained in:
John Cupitt 2022-03-03 11:48:49 +00:00
parent 8e9fe72dea
commit eb577606a0
1 changed files with 10 additions and 10 deletions
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20
libvips/foreign/cgifsave.c
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@ -93,7 +93,7 @@ typedef struct _VipsForeignSaveCgif {
/* The current colourmap, updated on a significant frame change.
*/
VipsPel *palette_rgb;
guint64 frame_sum;
gint64 frame_sum;
/* The index frame we get libimagequant to generate.
*/
@ -195,7 +195,7 @@ vips_foreign_save_cgif_write_frame( VipsForeignSaveCgif *cgif )
VipsPel * restrict p;
VipsPel *rgb;
guint64 sum;
gint64 sum;
double change;
int i;
CGIF_FrameConfig frame_config;
@ -237,7 +237,7 @@ vips_foreign_save_cgif_write_frame( VipsForeignSaveCgif *cgif )
p += 4;
}
change = VIPS_ABS( (sum - cgif->frame_sum) / n_pels );
change = VIPS_ABS( ((double) sum - cgif->frame_sum) ) / n_pels;
if( cgif->frame_sum == 0 ||
change > 0 ) {
@ -289,19 +289,19 @@ vips_foreign_save_cgif_write_frame( VipsForeignSaveCgif *cgif )
rgb += 3;
}
/* If there's a transparent pixel, it's always first.
*/
cgif->has_transparency = cgif->lp->entries[0].a == 0;
#ifdef DEBUG_PERCENT
if( percent_change > 0 )
printf( "frame %d, %.4g%% change, new %d item colourmap\n",
page_index, percent_change, cgif->lp->count );
if( change > 0 )
printf( "frame %d, change %g, new %d item colourmap\n",
page_index, change, cgif->lp->count );
else
printf( "frame %d, reusing previous %d item colourmap\n",
page_index, cgif->lp->count );
#endif/*DEBUG_PERCENT*/
/* If there's a transparent pixel, it's always first.
*/
cgif->has_transparency = cgif->lp->entries[0].a == 0;
/* Set up cgif on first use, so we can set the first cmap as the global
* one.
*