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better rules for 16-bit heifsave 

now parallel 16-bit PNG save

see https://github.com/libvips/libvips/discussions/3087
This commit is contained in:
John Cupitt 2022-10-11 08:45:24 +01:00
parent 7547476f44
commit fbef674625
2 changed files with 30 additions and 28 deletions
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3
ChangeLog
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@ -1,3 +1,6 @@
11/10/22 started 8.13.3
- improve rules for 16-bit heifsave [johntrunc]
5/9/22 started 8.13.2
- in dzsave, add add missing include directive for errno/EEXIST [kleisauke]
- fix 8 bit pallete PNG save [lovell]

55
libvips/foreign/heifsave.c
View File

@ -14,6 +14,8 @@
* - rename "speed" as "effort" for consistency with other savers
* 22/12/21
* - add >8 bit support
* 22/10/11
* - improve rules for 16-bit write [johntrunc]
*/
/*
@ -48,21 +50,6 @@
#define DEBUG
*/
/*
*
TODO:
what about a 16-bit PNG saved with bitdepth=8? does this work?
no!
what about a 8-bit PNG saved with bitdepth=12? does this work?
*
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif /*HAVE_CONFIG_H*/
@ -309,7 +296,7 @@ vips_foreign_save_heif_pack( VipsForeignSaveHeif *heif,
if( heif->image->BandFmt == VIPS_FORMAT_UCHAR &&
heif->bitdepth == 8 )
/* Most common cases -- 8 bit to 8 bit.
/* Most common case -- 8 bit to 8 bit.
*/
memcpy( q, p, ne );
else if( heif->image->BandFmt == VIPS_FORMAT_UCHAR &&
@ -330,8 +317,14 @@ vips_foreign_save_heif_pack( VipsForeignSaveHeif *heif,
else if( heif->image->BandFmt == VIPS_FORMAT_USHORT &&
heif->bitdepth <= 8 ) {
/* 16-bit native byte order source, 8 bit write.
*/
int shift = 16 - heif->bitdepth;
*
* Pick the high or low bits of the source.
*/
int vips_bitdepth =
heif->image->Type == VIPS_INTERPRETATION_RGB16 ||
heif->image->Type == VIPS_INTERPRETATION_GREY16 ?
16 : 8;
int shift = vips_bitdepth - heif->bitdepth;
for( i = 0; i < ne; i++ ) {
guint16 v = *((gushort *) p) >> shift;
@ -345,7 +338,11 @@ vips_foreign_save_heif_pack( VipsForeignSaveHeif *heif,
heif->bitdepth > 8 ) {
/* 16-bit native byte order source, 16 bit bigendian write.
*/
int shift = 16 - heif->bitdepth;
int vips_bitdepth =
heif->image->Type == VIPS_INTERPRETATION_RGB16 ||
heif->image->Type == VIPS_INTERPRETATION_GREY16 ?
16 : 8;
int shift = vips_bitdepth - heif->bitdepth;
for( i = 0; i < ne; i++ ) {
guint16 v = *((gushort *) p) >> shift;
@ -435,6 +432,12 @@ vips_foreign_save_heif_build( VipsObject *object )
build( object ) )
return( -1 );
/* Make a copy of the image in case we modify the metadata eg. for
* exif_update.
*/
if( vips_copy( save->ready, &heif->image, NULL ) )
return( -1 );
/* If the old, deprecated "speed" param is being used and the new
* "effort" param is not, use speed to init effort.
*/
@ -442,18 +445,14 @@ vips_foreign_save_heif_build( VipsObject *object )
!vips_object_argument_isset( object, "effort" ) )
heif->effort = 9 - heif->speed;
/* Default 12 bit save for ushort. HEIC (for example) implements
/* Default 12 bit save for 16-bit images. HEIC (for example) implements
* 8 / 10 / 12.
*/
if( !vips_object_argument_isset( object, "bitdepth" ) )
heif->bitdepth = save->ready->BandFmt == VIPS_FORMAT_UCHAR ?
8 : 12;
/* Make a copy of the image in case we modify the metadata eg. for
* exif_update.
*/
if( vips_copy( save->ready, &heif->image, NULL ) )
return( -1 );
heif->bitdepth =
heif->image->Type == VIPS_INTERPRETATION_RGB16 ||
heif->image->Type == VIPS_INTERPRETATION_GREY16 ?
12 : 8;
error = heif_context_get_encoder_for_format( heif->ctx,
(enum heif_compression_format) heif->compression,