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libvips/libvips/foreign/spngsave.c

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/* save to spng
*
* 2/12/11
* - wrap a class around the spng writer
* 16/7/12
* - compression should be 0-9, not 1-10
* 20/6/18 [felixbuenemann]
* - support spng8 palette write with palette, colours, Q, dither
* 24/6/20
* - add @bitdepth, deprecate @colours
* 11/11/21
* - use libspng for save
* 15/7/22 [lovell]
* - default filter to none
*/
/*
This file is part of VIPS.
VIPS is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA
*/
/*
These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk
*/
/*
#define DEBUG_VERBOSE
#define DEBUG
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif /*HAVE_CONFIG_H*/
#include <glib/gi18n-lib.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <vips/vips.h>
#include "pforeign.h"
#include "quantise.h"
#ifdef HAVE_SPNG
#include <spng.h>
typedef struct _VipsForeignSaveSpng {
VipsForeignSave parent_object;
int compression;
gboolean interlace;
char *profile;
VipsForeignPngFilter filter;
gboolean palette;
int Q;
double dither;
int bitdepth;
int effort;
/* Set by subclasses.
*/
VipsTarget *target;
/* Write state.
*/
spng_ctx *ctx;
GSList *text_chunks;
VipsImage *memory;
size_t sizeof_line;
VipsPel *line;
/* Deprecated.
*/
int colours;
} VipsForeignSaveSpng;
typedef VipsForeignSaveClass VipsForeignSaveSpngClass;
G_DEFINE_ABSTRACT_TYPE( VipsForeignSaveSpng, vips_foreign_save_spng,
VIPS_TYPE_FOREIGN_SAVE );
static void
vips_foreign_save_spng_dispose( GObject *gobject )
{
VipsForeignSaveSpng *spng = (VipsForeignSaveSpng *) gobject;
GSList *p;
VIPS_UNREF( spng->target );
VIPS_UNREF( spng->memory );
VIPS_FREEF( spng_ctx_free, spng->ctx );
for( p = spng->text_chunks; p; p = p->next ) {
struct spng_text *text = (struct spng_text *) p->data;
VIPS_FREE( text->text );
VIPS_FREE( text );
}
VIPS_FREEF( g_slist_free, spng->text_chunks );
VIPS_FREE( spng->line );
G_OBJECT_CLASS( vips_foreign_save_spng_parent_class )->
dispose( gobject );
}
static int
vips_foreign_save_spng_text( VipsForeignSaveSpng *spng,
const char *keyword, const char *value )
{
struct spng_text *text = VIPS_NEW( NULL, struct spng_text );
vips_strncpy( text->keyword, keyword, sizeof( text->keyword ) );
/* FIXME ... is this right?
*/
text->type = SPNG_TEXT;
text->length = strlen( value );
text->text = g_strdup( value );
spng->text_chunks = g_slist_prepend( spng->text_chunks, text );
return( 0 );
}
static void *
vips_foreign_save_spng_comment( VipsImage *image,
const char *field, GValue *value, void *user_data )
{
VipsForeignSaveSpng *spng = (VipsForeignSaveSpng *) user_data;
if( vips_isprefix( "png-comment-", field ) ) {
const char *value;
int i;
char key[256];
if( vips_image_get_string( image, field, &value ) )
return( image );
if( strlen( field ) > 256 ||
sscanf( field, "png-comment-%d-%80s", &i, key ) != 2 ) {
vips_error( "vips2png",
"%s", _( "bad png comment key" ) );
return( image );
}
vips_foreign_save_spng_text( spng, key, value );
}
return( NULL );
}
static int
vips_foreign_save_spng_metadata( VipsForeignSaveSpng *spng, VipsImage *in )
{
struct spng_iccp iccp;
uint32_t n_text;
struct spng_text *text_chunk_array;
int i;
GSList *p;
if( spng->profile ) {
VipsBlob *blob;
if( vips_profile_load( spng->profile, &blob, NULL ) )
return( -1 );
if( blob ) {
size_t length;
const void *data = vips_blob_get( blob, &length );
char *basename = g_path_get_basename( spng->profile );
#ifdef DEBUG
printf( "write_vips: attaching %zd bytes "
"of ICC profile\n", length );
#endif /*DEBUG*/
vips_strncpy( iccp.profile_name, basename,
sizeof( iccp.profile_name ) );
iccp.profile_len = length;
iccp.profile = (void *) data;
spng_set_iccp( spng->ctx, &iccp );
vips_area_unref( (VipsArea *) blob );
g_free( basename );
}
}
else if( vips_image_get_typeof( in, VIPS_META_ICC_NAME ) ) {
const void *data;
size_t length;
if( vips_image_get_blob( in, VIPS_META_ICC_NAME,
&data, &length ) )
return( -1 );
#ifdef DEBUG
printf( "write_vips: attaching %zd bytes "
"of ICC profile\n", length );
#endif /*DEBUG*/
vips_strncpy( iccp.profile_name, "icc",
sizeof( iccp.profile_name ) );
iccp.profile_len = length;
iccp.profile = (void *) data;
spng_set_iccp( spng->ctx, &iccp );
}
if( vips_image_get_typeof( in, VIPS_META_XMP_NAME ) ) {
const void *data;
size_t length;
char *str;
if( vips_image_get_blob( in,
VIPS_META_XMP_NAME, &data, &length ) )
return( -1 );
/* The blob form of the XMP metadata is missing the
* terminating \0 bytes, we have to paste it back,
* unfortunately. See pngload.
*/
str = g_malloc( length + 1 );
vips_strncpy( str, data, length + 1 );
vips_foreign_save_spng_text( spng, "XML:com.adobe.xmp", str );
g_free( str );
}
if( vips_image_map( in, vips_foreign_save_spng_comment, spng ) )
return( -1 );
n_text = g_slist_length( spng->text_chunks );
text_chunk_array = VIPS_ARRAY( NULL, n_text, struct spng_text );
for( i = 0, p = spng->text_chunks; p; p = p->next, i++ ) {
struct spng_text *text = (struct spng_text *) p->data;
text_chunk_array[i] = *text;
}
#ifdef DEBUG
printf( "attaching %u text items\n", n_text );
#endif /*DEBUG*/
spng_set_text( spng->ctx, text_chunk_array, n_text );
VIPS_FREE( text_chunk_array );
return( 0 );
}
/* Pack a line of 1/2/4 bit index values.
*/
static void
vips_foreign_save_spng_pack( VipsForeignSaveSpng *spng,
VipsPel *q, VipsPel *p, size_t n )
{
int pixel_mask = 8 / spng->bitdepth - 1;
int shift = 8 - spng->bitdepth;
VipsPel bits;
size_t x;
bits = 0;
for( x = 0; x < n; x++ ) {
bits <<= spng->bitdepth;
bits |= p[x] >> shift;
if( (x & pixel_mask) == pixel_mask )
*q++ = bits;
}
/* Any left-over bits? Need to be left-aligned.
*/
if( (x & pixel_mask) != 0 ) {
/* The number of bits we've collected and must
* left-align and flush.
*/
int collected_bits = (x & pixel_mask) << (spng->bitdepth - 1);
*q++ = bits << (8 - collected_bits);
}
}
static int
vips_foreign_save_spng_write_fn( spng_ctx *ctx, void *user,
void *data, size_t n )
{
VipsForeignSaveSpng *spng = (VipsForeignSaveSpng *) user;
if( vips_target_write( spng->target, data, n ) )
return( SPNG_IO_ERROR );
return( 0 );
}
static int
vips_foreign_save_spng_write_block( VipsRegion *region, VipsRect *area,
void *user )
{
VipsForeignSaveSpng *spng = (VipsForeignSaveSpng *) user;
VipsObjectClass *class = VIPS_OBJECT_GET_CLASS( spng );
int y;
int error;
/* The area to write is always a set of complete scanlines.
*/
g_assert( area->left == 0 );
g_assert( area->width == region->im->Xsize );
g_assert( area->top + area->height <= region->im->Ysize );
for( y = 0; y < area->height; y++ ) {
VipsPel *line;
size_t sizeof_line;
line = VIPS_REGION_ADDR( region, 0, area->top + y );
sizeof_line = VIPS_REGION_SIZEOF_LINE( region );
if( spng->bitdepth < 8 ) {
vips_foreign_save_spng_pack( spng,
spng->line, line, sizeof_line );
line = spng->line;
sizeof_line = spng->sizeof_line;
}
if( (error = spng_encode_row( spng->ctx, line, sizeof_line )) )
break;
}
/* You can get SPNG_EOI for the final scanline.
*/
if( error &&
error != SPNG_EOI ) {
vips_error( class->nickname, "%s", spng_strerror( error ) );
return( -1 );
}
return( 0 );
}
static int
vips_foreign_save_spng_write( VipsForeignSaveSpng *spng, VipsImage *in )
{
VipsObjectClass *class = VIPS_OBJECT_GET_CLASS( spng );
VipsForeignSave *save = (VipsForeignSave *) spng;
int error;
struct spng_ihdr ihdr;
struct spng_phys phys;
struct spng_plte plte = { 0 };
struct spng_trns trns = { 0 };
int fmt;
enum spng_encode_flags encode_flags;
spng->ctx = spng_ctx_new( SPNG_CTX_ENCODER );
if( (error = spng_set_png_stream( spng->ctx,
vips_foreign_save_spng_write_fn, spng )) ) {
vips_error( class->nickname, "%s", spng_strerror( error ) );
return( -1 );
}
#ifdef HAVE_QUANTIZATION
if( spng->palette ) {
VipsImage *im_index;
VipsImage *im_palette;
int palette_count;
int i;
if( vips__quantise_image( in, &im_index, &im_palette,
1 << spng->bitdepth,
spng->Q,
spng->dither,
spng->effort,
FALSE ) )
return( -1 );
/* PNG is 8-bit index only.
*/
palette_count = im_palette->Xsize;
g_assert( palette_count <= 256 );
for( i = 0; i < palette_count; i++ ) {
VipsPel *p = (VipsPel *)
VIPS_IMAGE_ADDR( im_palette, i, 0 );
struct spng_plte_entry *entry =
&plte.entries[plte.n_entries];
entry->red = p[0];
entry->green = p[1];
entry->blue = p[2];
plte.n_entries += 1;
/* Quantizr and libimagequant sort the pallette
* by transparency, so trns.type3_alpha[] and
* plte.entries[] will use the same indexing.
*/
g_assert( i == 0 || p[3] >= p[-1] );
if( p[3] != 255 ) {
trns.type3_alpha[trns.n_type3_entries] = p[3];
trns.n_type3_entries += 1;
}
}
#ifdef DEBUG
printf( "attaching %d entry palette\n", plte.n_entries );
if( trns.n_type3_entries )
printf( "attaching %d transparency values\n",
trns.n_type3_entries );
#endif /*DEBUG*/
VIPS_UNREF( im_palette );
in = spng->memory = im_index;
}
#endif /*HAVE_QUANTIZATION*/
ihdr.width = in->Xsize;
ihdr.height = in->Ysize;
ihdr.bit_depth = spng->bitdepth;
/* Low-bitdepth write needs an extra buffer for packing pixels.
*/
if( spng->bitdepth < 8 ) {
spng->sizeof_line = 1 + VIPS_IMAGE_SIZEOF_LINE( in ) /
(8 / spng->bitdepth);
if( !(spng->line =
vips_malloc( NULL, VIPS_IMAGE_SIZEOF_LINE( in ) )) )
return( -1 );
}
switch( in->Bands ) {
case 1:
if( spng->palette )
ihdr.color_type = SPNG_COLOR_TYPE_INDEXED;
else
ihdr.color_type = SPNG_COLOR_TYPE_GRAYSCALE;
break;
case 2:
ihdr.color_type = SPNG_COLOR_TYPE_GRAYSCALE_ALPHA;
break;
case 3:
ihdr.color_type = SPNG_COLOR_TYPE_TRUECOLOR;
break;
case 4:
ihdr.color_type = SPNG_COLOR_TYPE_TRUECOLOR_ALPHA;
break;
default:
vips_error( class->nickname, "%s", _( "bad bands" ) );
return( -1 );
}
ihdr.compression_method = 0;
ihdr.filter_method = 0;
ihdr.interlace_method = spng->interlace ? 1 : 0;
if( (error = spng_set_ihdr( spng->ctx, &ihdr )) ) {
vips_error( class->nickname, "%s", spng_strerror( error ) );
return( -1 );
}
spng_set_option( spng->ctx,
SPNG_IMG_COMPRESSION_LEVEL, spng->compression );
spng_set_option( spng->ctx,
SPNG_TEXT_COMPRESSION_LEVEL, spng->compression );
spng_set_option( spng->ctx,
SPNG_FILTER_CHOICE, spng->filter );
/* Set resolution. png uses pixels per meter.
*/
phys.unit_specifier = 1;
phys.ppu_x = VIPS_RINT( in->Xres * 1000.0 );
phys.ppu_y = VIPS_RINT( in->Xres * 1000.0 );
spng_set_phys( spng->ctx, &phys );
/* Metadata.
*/
if( !save->strip &&
vips_foreign_save_spng_metadata( spng, in ) )
return( -1 );
#ifdef HAVE_QUANTIZATION
if( spng->palette ) {
spng_set_plte( spng->ctx, &plte );
if( trns.n_type3_entries )
spng_set_trns( spng->ctx, &trns );
}
#endif /*HAVE_QUANTIZATION*/
/* SPNG_FMT_PNG is a special value that matches the format in ihdr
*/
fmt = SPNG_FMT_PNG;
encode_flags = SPNG_ENCODE_PROGRESSIVE | SPNG_ENCODE_FINALIZE;
if( (error = spng_encode_image( spng->ctx,
NULL, -1, fmt, encode_flags )) ) {
vips_error( class->nickname, "%s", spng_strerror( error ) );
return( -1 );
}
if( spng->interlace ) {
/* Force the input into memory, if it's not there already.
*/
if( !spng->memory ) {
if( !(spng->memory = vips_image_copy_memory( in )) )
return( -1 );
in = spng->memory;
}
do {
struct spng_row_info row_info;
VipsPel *line;
size_t sizeof_line;
if( (error =
spng_get_row_info( spng->ctx, &row_info )) )
break;
line = VIPS_IMAGE_ADDR( in, 0, row_info.row_num );
sizeof_line = VIPS_IMAGE_SIZEOF_LINE( in );
if( spng->bitdepth < 8 ) {
vips_foreign_save_spng_pack( spng,
spng->line, line, sizeof_line );
line = spng->line;
sizeof_line = spng->sizeof_line;
}
error = spng_encode_row( spng->ctx, line, sizeof_line );
} while( !error );
if( error != SPNG_EOI ) {
vips_error( class->nickname,
"%s", spng_strerror( error ) );
return( -1 );
}
}
else {
if( vips_sink_disc( in,
vips_foreign_save_spng_write_block, spng ) )
return( -1 );
}
if( vips_target_end( spng->target ) )
return( -1 );
return( 0 );
}
static int
vips_foreign_save_spng_build( VipsObject *object )
{
VipsForeignSave *save = (VipsForeignSave *) object;
VipsForeignSaveSpng *spng = (VipsForeignSaveSpng *) object;
VipsImage *in;
if( VIPS_OBJECT_CLASS( vips_foreign_save_spng_parent_class )->
build( object ) )
return( -1 );
in = save->ready;
g_object_ref( in );
/* If no output bitdepth has been specified, use input Type to pick.
*/
if( !vips_object_argument_isset( object, "bitdepth" ) )
spng->bitdepth =
in->Type == VIPS_INTERPRETATION_RGB16 ||
in->Type == VIPS_INTERPRETATION_GREY16 ? 16 : 8;
/* Deprecated "colours" arg just sets bitdepth large enough to hold
* that many colours.
*/
if( vips_object_argument_isset( object, "colours" ) )
spng->bitdepth = ceil( log2( spng->colours ) );
/* Cast in down to 8 bit if we can.
*/
if( spng->bitdepth <= 8 ) {
VipsImage *x;
if( vips_cast( in, &x, VIPS_FORMAT_UCHAR, NULL ) ) {
g_object_unref( in );
return( -1 );
}
g_object_unref( in );
in = x;
}
/* If this is a RGB or RGBA image and a low bit depth has been
* requested, enable palettisation.
*/
if( in->Bands > 2 &&
spng->bitdepth < 8 )
spng->palette = TRUE;
/* Disable palettization for >8 bit save.
*/
if( spng->bitdepth > 8 )
spng->palette = FALSE;
if( vips_foreign_save_spng_write( spng, in ) ) {
g_object_unref( in );
return( -1 );
}
g_object_unref( in );
return( 0 );
}
/* Except for 8-bit inputs, we send everything else to 16. We decide on spng8
* vs. spng16 based on Type in_build(), see above.
*/
#define UC VIPS_FORMAT_UCHAR
#define US VIPS_FORMAT_USHORT
static int bandfmt_spng[10] = {
/* UC C US S UI I F X D DX */
UC, UC, US, US, US, US, US, US, US, US
};
static void
vips_foreign_save_spng_class_init( VipsForeignSaveSpngClass *class )
{
GObjectClass *gobject_class = G_OBJECT_CLASS( class );
VipsObjectClass *object_class = (VipsObjectClass *) class;
VipsForeignClass *foreign_class = (VipsForeignClass *) class;
VipsForeignSaveClass *save_class = (VipsForeignSaveClass *) class;
gobject_class->dispose = vips_foreign_save_spng_dispose;
gobject_class->set_property = vips_object_set_property;
gobject_class->get_property = vips_object_get_property;
object_class->nickname = "spngsave_base";
object_class->description = _( "save spng" );
object_class->build = vips_foreign_save_spng_build;
foreign_class->suffs = vips__png_suffs;
save_class->saveable = VIPS_SAVEABLE_RGBA;
save_class->format_table = bandfmt_spng;
VIPS_ARG_INT( class, "compression", 6,
_( "Compression" ),
_( "Compression factor" ),
VIPS_ARGUMENT_OPTIONAL_INPUT,
G_STRUCT_OFFSET( VipsForeignSaveSpng, compression ),
0, 9, 6 );
VIPS_ARG_BOOL( class, "interlace", 7,
_( "Interlace" ),
_( "Interlace image" ),
VIPS_ARGUMENT_OPTIONAL_INPUT,
G_STRUCT_OFFSET( VipsForeignSaveSpng, interlace ),
FALSE );
VIPS_ARG_STRING( class, "profile", 11,
_( "Profile" ),
_( "ICC profile to embed" ),
VIPS_ARGUMENT_OPTIONAL_INPUT,
G_STRUCT_OFFSET( VipsForeignSaveSpng, profile ),
NULL );
VIPS_ARG_FLAGS( class, "filter", 12,
_( "Filter" ),
_( "libspng row filter flag(s)" ),
VIPS_ARGUMENT_OPTIONAL_INPUT,
G_STRUCT_OFFSET( VipsForeignSaveSpng, filter ),
VIPS_TYPE_FOREIGN_PNG_FILTER,
VIPS_FOREIGN_PNG_FILTER_NONE );
VIPS_ARG_BOOL( class, "palette", 13,
_( "Palette" ),
_( "Quantise to 8bpp palette" ),
VIPS_ARGUMENT_OPTIONAL_INPUT,
G_STRUCT_OFFSET( VipsForeignSaveSpng, palette ),
FALSE );
VIPS_ARG_INT( class, "Q", 15,
_( "Quality" ),
_( "Quantisation quality" ),
VIPS_ARGUMENT_OPTIONAL_INPUT,
G_STRUCT_OFFSET( VipsForeignSaveSpng, Q ),
0, 100, 100 );
VIPS_ARG_DOUBLE( class, "dither", 16,
_( "Dithering" ),
_( "Amount of dithering" ),
VIPS_ARGUMENT_OPTIONAL_INPUT,
G_STRUCT_OFFSET( VipsForeignSaveSpng, dither ),
0.0, 1.0, 1.0 );
VIPS_ARG_INT( class, "bitdepth", 17,
_( "Bit depth" ),
_( "Write as a 1, 2, 4, 8 or 16 bit image" ),
VIPS_ARGUMENT_OPTIONAL_INPUT,
G_STRUCT_OFFSET( VipsForeignSaveSpng, bitdepth ),
0, 16, 0 );
VIPS_ARG_INT( class, "effort", 18,
_( "Effort" ),
_( "Quantisation CPU effort" ),
VIPS_ARGUMENT_OPTIONAL_INPUT,
G_STRUCT_OFFSET( VipsForeignSaveSpng, effort ),
1, 10, 7 );
VIPS_ARG_INT( class, "colours", 14,
_( "Colours" ),
_( "Max number of palette colours" ),
VIPS_ARGUMENT_OPTIONAL_INPUT | VIPS_ARGUMENT_DEPRECATED,
G_STRUCT_OFFSET( VipsForeignSaveSpng, colours ),
2, 256, 256 );
}
static void
vips_foreign_save_spng_init( VipsForeignSaveSpng *spng )
{
spng->compression = 6;
spng->filter = VIPS_FOREIGN_PNG_FILTER_NONE;
spng->Q = 100;
spng->dither = 1.0;
spng->effort = 7;
}
typedef struct _VipsForeignSaveSpngTarget {
VipsForeignSaveSpng parent_object;
VipsTarget *target;
} VipsForeignSaveSpngTarget;
typedef VipsForeignSaveSpngClass VipsForeignSaveSpngTargetClass;
G_DEFINE_TYPE( VipsForeignSaveSpngTarget, vips_foreign_save_spng_target,
vips_foreign_save_spng_get_type() );
static int
vips_foreign_save_spng_target_build( VipsObject *object )
{
VipsForeignSaveSpng *spng = (VipsForeignSaveSpng *) object;
VipsForeignSaveSpngTarget *target =
(VipsForeignSaveSpngTarget *) object;
spng->target = target->target;
g_object_ref( spng->target );
if( VIPS_OBJECT_CLASS( vips_foreign_save_spng_target_parent_class )->
build( object ) )
return( -1 );
return( 0 );
}
static void
vips_foreign_save_spng_target_class_init( VipsForeignSaveSpngTargetClass *class )
{
GObjectClass *gobject_class = G_OBJECT_CLASS( class );
VipsObjectClass *object_class = (VipsObjectClass *) class;
gobject_class->set_property = vips_object_set_property;
gobject_class->get_property = vips_object_get_property;
object_class->nickname = "pngsave_target";
object_class->description = _( "save image to target as PNG" );
object_class->build = vips_foreign_save_spng_target_build;
VIPS_ARG_OBJECT( class, "target", 1,
_( "Target" ),
_( "Target to save to" ),
VIPS_ARGUMENT_REQUIRED_INPUT,
G_STRUCT_OFFSET( VipsForeignSaveSpngTarget, target ),
VIPS_TYPE_TARGET );
}
static void
vips_foreign_save_spng_target_init( VipsForeignSaveSpngTarget *target )
{
}
typedef struct _VipsForeignSaveSpngFile {
VipsForeignSaveSpng parent_object;
char *filename;
} VipsForeignSaveSpngFile;
typedef VipsForeignSaveSpngClass VipsForeignSaveSpngFileClass;
G_DEFINE_TYPE( VipsForeignSaveSpngFile, vips_foreign_save_spng_file,
vips_foreign_save_spng_get_type() );
static int
vips_foreign_save_spng_file_build( VipsObject *object )
{
VipsForeignSaveSpng *spng = (VipsForeignSaveSpng *) object;
VipsForeignSaveSpngFile *file = (VipsForeignSaveSpngFile *) object;
if( !(spng->target = vips_target_new_to_file( file->filename )) )
return( -1 );
if( VIPS_OBJECT_CLASS( vips_foreign_save_spng_file_parent_class )->
build( object ) )
return( -1 );
return( 0 );
}
static void
vips_foreign_save_spng_file_class_init( VipsForeignSaveSpngFileClass *class )
{
GObjectClass *gobject_class = G_OBJECT_CLASS( class );
VipsObjectClass *object_class = (VipsObjectClass *) class;
gobject_class->set_property = vips_object_set_property;
gobject_class->get_property = vips_object_get_property;
object_class->nickname = "pngsave";
object_class->description = _( "save image to file as PNG" );
object_class->build = vips_foreign_save_spng_file_build;
VIPS_ARG_STRING( class, "filename", 1,
_( "Filename" ),
_( "Filename to save to" ),
VIPS_ARGUMENT_REQUIRED_INPUT,
G_STRUCT_OFFSET( VipsForeignSaveSpngFile, filename ),
NULL );
}
static void
vips_foreign_save_spng_file_init( VipsForeignSaveSpngFile *file )
{
}
typedef struct _VipsForeignSaveSpngBuffer {
VipsForeignSaveSpng parent_object;
VipsArea *buf;
} VipsForeignSaveSpngBuffer;
typedef VipsForeignSaveSpngClass VipsForeignSaveSpngBufferClass;
G_DEFINE_TYPE( VipsForeignSaveSpngBuffer, vips_foreign_save_spng_buffer,
vips_foreign_save_spng_get_type() );
static int
vips_foreign_save_spng_buffer_build( VipsObject *object )
{
VipsForeignSaveSpng *spng = (VipsForeignSaveSpng *) object;
VipsForeignSaveSpngBuffer *buffer =
(VipsForeignSaveSpngBuffer *) object;
VipsBlob *blob;
if( !(spng->target = vips_target_new_to_memory()) )
return( -1 );
if( VIPS_OBJECT_CLASS( vips_foreign_save_spng_buffer_parent_class )->
build( object ) )
return( -1 );
g_object_get( spng->target, "blob", &blob, NULL );
g_object_set( buffer, "buffer", blob, NULL );
vips_area_unref( VIPS_AREA( blob ) );
return( 0 );
}
static void
vips_foreign_save_spng_buffer_class_init( VipsForeignSaveSpngBufferClass *class )
{
GObjectClass *gobject_class = G_OBJECT_CLASS( class );
VipsObjectClass *object_class = (VipsObjectClass *) class;
gobject_class->set_property = vips_object_set_property;
gobject_class->get_property = vips_object_get_property;
object_class->nickname = "pngsave_buffer";
object_class->description = _( "save image to buffer as PNG" );
object_class->build = vips_foreign_save_spng_buffer_build;
VIPS_ARG_BOXED( class, "buffer", 1,
_( "Buffer" ),
_( "Buffer to save to" ),
VIPS_ARGUMENT_REQUIRED_OUTPUT,
G_STRUCT_OFFSET( VipsForeignSaveSpngBuffer, buf ),
VIPS_TYPE_BLOB );
}
static void
vips_foreign_save_spng_buffer_init( VipsForeignSaveSpngBuffer *buffer )
{
}
#endif /*HAVE_SPNG*/
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