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byteswap on ppm save, if necessary

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this was missing, thanks ewelot

see https://github.com/libvips/libvips/issues/1894
This commit is contained in:
John Cupitt 2020-11-22 16:37:24 +00:00
parent c0bace8f91
commit 6340e14303
2 changed files with 17 additions and 2 deletions
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2
ChangeLog
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@ -11,7 +11,7 @@
- add missing read loops to spng, heif, giflib and ppm load [kleisauke]
- block zero width or height images from imagemagick load [Koen1999]
- check for overflow in gifload height [lovell]
- fix msb_first default in ppm load [ewelot]
- fix msb_first default in ppm load and save [ewelot]
6/9/20 started 8.10.2
- update magicksave/load profile handling [kelilevi]

17
libvips/foreign/ppmsave.c
View File

@ -8,6 +8,8 @@
* - add "bitdepth" param, cf. tiffsave
* 27/6/20
* - add ppmsave_target
* 20/11/20
* - byteswap on save, if necessary [ewelot]
*/
/*
@ -298,6 +300,19 @@ vips_foreign_save_ppm( VipsForeignSavePpm *ppm, VipsImage *image )
vips_foreign_save_ppm_line_ascii :
vips_foreign_save_ppm_line_binary;
/* 16 and 32-bit binary write might need byteswapping.
*/
if( !ppm->ascii &&
(image->BandFmt == VIPS_FORMAT_USHORT ||
image->BandFmt == VIPS_FORMAT_UINT) ) {
VipsImage *x;
if( vips__byteswap_bool( image, &x, !vips_amiMSBfirst() ) )
return( -1 );
VIPS_UNREF( image );
image = x;
}
if( vips_sink_disc( image, vips_foreign_save_ppm_block, ppm ) )
return( -1 );
@ -402,7 +417,7 @@ vips_foreign_save_ppm_class_init( VipsForeignSavePpmClass *class )
VIPS_ARG_INT( class, "bitdepth", 15,
_( "bitdepth" ),
_( "Write as a 1 bit image" ),
_( "set to 1 to write as a 1 bit image" ),
VIPS_ARGUMENT_OPTIONAL_INPUT,
G_STRUCT_OFFSET( VipsForeignSavePpm, bitdepth ),
0, 1, 0 );