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don't write JFIF headers with [strip] 

saving a jpg with [strip] turned on now stops the APP0 jfif headers
being written

thanks Benjamin, see: https://github.com/jcupitt/libvips/issues/349
This commit is contained in:
John Cupitt 2015-11-25 13:17:30 +00:00
parent 18baf40b1a
commit 9b03b27b9c
1 changed files with 43 additions and 35 deletions
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78
libvips/foreign/vips2jpeg.c
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@ -69,7 +69,9 @@
* - omit oversized jpeg markers
* 15/7/15
* - exif tags use @name, not @title
* - set arbitrary exif tags from metadata
* - set arbitrary exif tags from metadata
* 25/11/15
* - don't write JFIF headers if we are stripping, thanks Benjamin
*/
/*
@ -940,9 +942,9 @@ write_vips( Write *write, int qfac, const char *profile,
#ifdef HAVE_JPEG_EXT_PARAMS
/* Reset compression profile to libjpeg defaults
*/
if( jpeg_c_int_param_supported( &write->cinfo, JINT_COMPRESS_PROFILE ) ) {
jpeg_c_set_int_param( &write->cinfo, JINT_COMPRESS_PROFILE, JCP_FASTEST );
}
if( jpeg_c_int_param_supported( &write->cinfo, JINT_COMPRESS_PROFILE ) )
jpeg_c_set_int_param( &write->cinfo,
JINT_COMPRESS_PROFILE, JCP_FASTEST );
#endif
/* Rest to default.
@ -955,61 +957,62 @@ write_vips( Write *write, int qfac, const char *profile,
write->cinfo.optimize_coding = optimize_coding;
#ifdef HAVE_JPEG_EXT_PARAMS
/* Apply trellis quantisation to each 8x8 block. Infers "optimize_coding".
/* Apply trellis quantisation to each 8x8 block. Implies
* "optimize_coding".
*/
if( trellis_quant ) {
if ( jpeg_c_bool_param_supported(
&write->cinfo, JBOOLEAN_TRELLIS_QUANT ) ) {
if( jpeg_c_bool_param_supported( &write->cinfo,
JBOOLEAN_TRELLIS_QUANT ) ) {
jpeg_c_set_bool_param( &write->cinfo,
JBOOLEAN_TRELLIS_QUANT, TRUE );
write->cinfo.optimize_coding = TRUE;
}
else {
vips_warn( "vips2jpeg", "%s", _( "trellis_quant unsupported" ) );
}
else
vips_warn( "vips2jpeg",
"%s", _( "trellis_quant unsupported" ) );
}
/* Apply overshooting to samples with extreme values e.g. 0 & 255 for 8-bit.
/* Apply overshooting to samples with extreme values e.g. 0 & 255
* for 8-bit.
*/
if( overshoot_deringing ) {
if ( jpeg_c_bool_param_supported(
&write->cinfo, JBOOLEAN_OVERSHOOT_DERINGING ) ) {
if( jpeg_c_bool_param_supported( &write->cinfo,
JBOOLEAN_OVERSHOOT_DERINGING ) )
jpeg_c_set_bool_param( &write->cinfo,
JBOOLEAN_OVERSHOOT_DERINGING, TRUE );
}
else {
vips_warn( "vips2jpeg", "%s", _( "overshoot_deringing unsupported" ) );
}
else
vips_warn( "vips2jpeg",
"%s", _( "overshoot_deringing unsupported" ) );
}
/* Split the spectrum of DCT coefficients into separate scans.
* Requires progressive output. Must be set before jpeg_simple_progression.
* Requires progressive output. Must be set before
* jpeg_simple_progression.
*/
if( optimize_scans ) {
if( progressive ) {
if( jpeg_c_bool_param_supported(
&write->cinfo, JBOOLEAN_OPTIMIZE_SCANS ) ) {
jpeg_c_set_bool_param( &write->cinfo, JBOOLEAN_OPTIMIZE_SCANS, TRUE );
}
else {
vips_warn( "vips2jpeg", "%s", _( "Ignoring optimize_scans" ) );
}
if( jpeg_c_bool_param_supported( &write->cinfo,
JBOOLEAN_OPTIMIZE_SCANS ) )
jpeg_c_set_bool_param( &write->cinfo,
JBOOLEAN_OPTIMIZE_SCANS, TRUE );
else
vips_warn( "vips2jpeg",
"%s", _( "Ignoring optimize_scans" ) );
}
else {
else
vips_warn( "vips2jpeg", "%s",
_( "Ignoring optimize_scans for baseline" ) );
}
}
#else
/* Using jpeglib.h without extension parameters, warn of ignored options.
/* Using jpeglib.h without extension parameters, warn of ignored
* options.
*/
if ( trellis_quant ) {
if( trellis_quant )
vips_warn( "vips2jpeg", "%s", _( "Ignoring trellis_quant" ) );
}
if ( overshoot_deringing ) {
vips_warn( "vips2jpeg", "%s", _( "Ignoring overshoot_deringing" ) );
}
if ( optimize_scans ) {
if( overshoot_deringing )
vips_warn( "vips2jpeg",
"%s", _( "Ignoring overshoot_deringing" ) );
if( optimize_scans )
vips_warn( "vips2jpeg", "%s", _( "Ignoring optimize_scans" ) );
}
#endif
/* Enable progressive write.
@ -1028,6 +1031,11 @@ write_vips( Write *write, int qfac, const char *profile,
}
}
/* Don't write the APP0 JFIF headers if we are stripping.
*/
if( strip )
write->cinfo.write_JFIF_header = FALSE;
/* Build compress tables.
*/
jpeg_start_compress( &write->cinfo, TRUE );