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libvips/libvips/iofuncs/image.c

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/* vips image class
*
* 4/2/11
* - hacked up from various places
*/
/*
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk
*/
/*
*/
#define VIPS_DEBUG
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif /*HAVE_CONFIG_H*/
#include <vips/intl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif /*HAVE_UNISTD_H*/
#include <ctype.h>
#include <vips/vips.h>
#include <vips/internal.h>
#include <vips/debug.h>
#ifdef WITH_DMALLOC
#include <dmalloc.h>
#endif /*WITH_DMALLOC*/
/**
* SECTION: image
* @short_description: the VIPS image class
* @stability: Stable
* @see_also: <link linkend="libvips-region">region</link>
* @include: vips/vips.h
*
* The image class and associated types and macros.
*/
/**
* VIPS_MAGIC_INTEL:
*
* The first four bytes of a VIPS file in Intel byte ordering.
*/
/**
* VIPS_MAGIC_SPARC:
*
* The first four bytes of a VIPS file in SPARC byte ordering.
*/
/**
* VipsDemandStyle:
* @VIPS_DEMAND_STYLE_SMALLTILE: demand in small (typically 64x64 pixel) tiles
* @VIPS_DEMAND_STYLE_FATSTRIP: demand in fat (typically 10 pixel high) strips
* @VIPS_DEMAND_STYLE_THINSTRIP: demand in thin (typically 1 pixel high) strips
* @VIPS_DEMAND_STYLE_ANY: demand geometry does not matter
*
* See im_demand_hint(). Operations can hint to the VIPS image IO system about
* the kind of demand geometry they prefer.
*
* These demand styles are given below in order of increasing
* restrictiveness. When demanding output from a pipeline, im_generate()
* will use the most restrictive of the styles requested by the operations
* in the pipeline.
*
* VIPS_DEMAND_STYLE_THINSTRIP --- This operation would like to output strips
* the width of the image and a few pels high. This is option suitable for
* point-to-point operations, such as those in the arithmetic package.
*
* This option is only efficient for cases where each output pel depends
* upon the pel in the corresponding position in the input image.
*
* VIPS_DEMAND_STYLE_FATSTRIP --- This operation would like to output strips
* the width of the image and as high as possible. This option is suitable
* for area operations which do not violently transform coordinates, such
* as im_conv().
*
* VIPS_DEMAND_STYLE_SMALLTILE --- This is the most general demand format.
* Output is demanded in small (around 100x100 pel) sections. This style works
* reasonably efficiently, even for bizzare operations like 45 degree rotate.
*
* VIPS_DEMAND_STYLE_ANY --- This image is not being demand-read from a disc
* file (even indirectly) so any demand style is OK. It's used for things like
* im_black() where the pixels are calculated.
*
* See also: vips_demand_hint().
*/
/**
* VipsInterpretation:
* @VIPS_TYPE_MULTIBAND: generic many-band image
* @VIPS_TYPE_B_W: some kind of single-band image
* @VIPS_TYPE_HISTOGRAM: a 1D image such as a histogram or lookup table
* @VIPS_TYPE_FOURIER: image is in fourier space
* @VIPS_TYPE_XYZ: the first three bands are colours in CIE XYZ colourspace
* @VIPS_TYPE_LAB: pixels are in CIE Lab space
* @VIPS_TYPE_CMYK: the first four bands are in CMYK space
* @VIPS_TYPE_LABQ: implies #VIPS_CODING_LABQ
* @VIPS_TYPE_RGB: generic RGB space
* @VIPS_TYPE_UCS: a uniform colourspace based on CMC
* @VIPS_TYPE_LCH: pixels are in CIE LCh space
* @VIPS_TYPE_LABS: pixels are CIE LAB coded as three signed 16-bit values
* @VIPS_TYPE_sRGB: pixels are sRGB
* @VIPS_TYPE_YXY: pixels are CIE Yxy
* @VIPS_TYPE_RGB16: generic 16-bit RGB
* @VIPS_TYPE_GREY16: generic 16-bit mono
*
* How the values in an image should be interpreted. For example, a
* three-band float image of type #VIPS_TYPE_LAB should have its pixels
* interpreted as coordinates in CIE Lab space.
*
* These values are set by operations as hints to user-interfaces built on top
* of VIPS to help them show images to the user in a meaningful way.
* Operations do not use these values to decide their action.
*/
/**
* VipsBandFormat:
* @VIPS_FORMAT_NOTSET: invalid setting
* @VIPS_FORMAT_UCHAR: unsigned char format
* @VIPS_FORMAT_CHAR: char format
* @VIPS_FORMAT_USHORT: unsigned short format
* @VIPS_FORMAT_SHORT: short format
* @VIPS_FORMAT_UINT: unsigned int format
* @VIPS_FORMAT_INT: int format
* @VIPS_FORMAT_FLOAT: float format
* @VIPS_FORMAT_COMPLEX: complex (two floats) format
* @VIPS_FORMAT_DOUBLE: double float format
* @VIPS_FORMAT_DPCOMPLEX: double complex (two double) format
*
* The format used for each band element.
*
* Each corresponnds to a native C type for the current machine. For example,
* #VIPS_FORMAT_USHORT is <type>unsigned short</type>.
*/
/**
* VipsCoding:
* @VIPS_CODING_NONE: pixels are not coded
* @VIPS_CODING_LABQ: pixels encode 3 float CIELAB values as 4 uchar
* @VIPS_CODING_RAD: pixels encode 3 float RGB as 4 uchar (Radiance coding)
*
* How pixels are coded.
*
* Normally, pixels are uncoded and can be manipulated as you would expect.
* However some file formats code pixels for compression, and sometimes it's
* useful to be able to manipulate images in the coded format.
*/
/**
* VipsProgress:
* @run: Time we have been running
* @eta: Estimated seconds of computation left
* @tpels: Number of pels we expect to calculate
* @npels: Number of pels calculated so far
* @percent: Percent complete
* @start: Start time
*
* A structure available to eval callbacks giving information on evaluation
* progress. See im_add_eval_callback().
*/
/**
* VipsImage:
*
* An image. These can represent an image on disc, a memory buffer, an image
* in the process of being written to disc or a partially evaluated image
* in memory.
*/
/**
* VIPS_IMAGE_SIZEOF_ELEMENT:
* @I: a #VipsImage
*
* Returns: sizeof() a band element.
*/
/**
* VIPS_IMAGE_SIZEOF_PEL:
* @I: a #VipsImage
*
* Returns: sizeof() a pixel.
*/
/**
* VIPS_IMAGE_SIZEOF_LINE:
* @I: a #VipsImage
*
* Returns: sizeof() a scanline of pixels.
*/
/**
* VIPS_IMAGE_N_ELEMENTS:
* @I: a #VipsImage
*
* Returns: The number of band elements in a scanline.
*/
/**
* VIPS_IMAGE_ADDR:
* @I: a #VipsImage
* @X: x coordinate
* @Y: y coordinate
*
* This macro returns a pointer to a pixel in an image. It only works for
* images which are fully available in memory, so memory buffers and small
* mapped images only.
*
* If VIPS_DEBUG is defined, you get a version that checks bounds for you.
*
* See also: VIPS_REGION_ADDR().
*
* Returns: The address of pixel (x,y) in the image.
*/
/**
* vips_image_open_local_array:
* @IM: image to open local to
* @OUT: array to fill with #VipsImage *
* @N: array size
* @NAME: filename to open
* @MODE: mode to open with
*
* Just like vips_image_open(), but opens an array of images. Handy for creating a
* set of temporary images for a function.
*
* Example:
*
* |[
* VipsImage *t[5];
*
* if( vips_image_open_local_array( out, t, 5, "some-temps", "p" ) ||
* vips_add( a, b, t[0] ) ||
* vips_invert( t[0], t[1] ) ||
* vips_add( t[1], t[0], t[2] ) ||
* vips_costra( t[2], out ) )
* return( -1 );
* ]|
*
* See also: vips_image_open(), vips_image_open_local(), vips_local_array().
*
* Returns: 0 on sucess, or -1 on error
*/
/**
* vips_image_open_local:
* @IM: image to open local to
* @NAME: filename to open
* @MODE: mode to open with
*
* Just like vips_image_open(), but the #VipsImage will be closed for you
* automatically when @IM is closed.
*
* See also: vips_image_open(), vips_local().
*
* Returns: a new #VipsImage, or %NULL on error
*/
/* Properties.
*/
enum {
PROP_WIDTH = 1,
PROP_HEIGHT,
PROP_BANDS,
PROP_FORMAT,
PROP_FILENAME,
PROP_KILL,
PROP_MODE,
PROP_DEMAND,
PROP_SIZEOF_HEADER,
PROP_FOREIGN_BUFFER,
PROP_LAST
};
/* Our signals.
*/
enum {
SIG_PREEVAL,
SIG_EVAL,
SIG_POSTEVAL,
SIG_WRITTEN,
SIG_INVALIDATE,
SIG_LAST
};
/* Progress feedback. Only really useful for testing, tbh.
*/
int im__progress = 0;
/* A string giving the image size (in bytes of uncompressed image) above which
* we decompress to disc on open. Can be eg. "12m" for 12 megabytes.
*/
char *im__disc_threshold = NULL;
static guint vips_image_signals[SIG_LAST] = { 0 };
G_DEFINE_TYPE( VipsImage, vips_image, VIPS_TYPE_OBJECT );
static void
vips_image_finalize( GObject *gobject )
{
VipsImage *image = VIPS_IMAGE( gobject );
/* Should be no regions defined on the image, since they all hold a
* ref to their host image.
*/
g_assert( !image->regions );
/* Therefore there should be no windows.
*/
g_assert( !image->windows );
/* Junk generate functions.
*/
image->start = NULL;
image->generate = NULL;
image->stop = NULL;
image->client1 = NULL;
image->client2 = NULL;
/* No more upstream/downstream links.
*/
im__link_break_all( image );
/* Any file mapping?
*/
if( image->baseaddr ) {
/* MMAP file.
*/
VIPS_DEBUG_MSG( "vips_image_finalize: unmapping file\n" );
im__munmap( image->baseaddr, image->length );
image->baseaddr = NULL;
image->length = 0;
/* This must have been a pointer to the mmap region, rather
* than a setbuf.
*/
image->data = NULL;
}
if( image->time ) {
VIPS_FREEF( g_timer_destroy, image->time->start );
VIPS_FREE( image->time );
}
/* Is there a file descriptor?
*/
if( image->fd != -1 ) {
VIPS_DEBUG_MSG( "vips_image_finalize: closing output file\n" );
if( image->dtype == VIPS_IMAGE_OPENOUT )
(void) im__writehist( image );
if( close( image->fd ) == -1 )
vips_error( "VipsImage",
_( "unable to close fd for %s" ),
image->filename );
image->fd = -1;
}
/* Any image data?
*/
if( image->data ) {
/* Buffer image. Only free stuff we know we allocated.
*/
if( image->dtype == VIPS_IMAGE_SETBUF ) {
VIPS_DEBUG_MSG( "vips_image_finalize: "
"freeing buffer\n" );
im_free( image->data );
image->dtype = VIPS_IMAGE_NONE;
}
image->data = NULL;
}
VIPS_FREE( image->filename );
VIPS_FREE( image->mode );
VIPS_FREEF( g_mutex_free, image->sslock );
VIPS_FREE( image->Hist );
VIPS_FREEF( im__gslist_gvalue_free, image->history_list );
im__meta_destroy( image );
G_OBJECT_CLASS( vips_image_parent_class )->finalize( gobject );
}
static void
vips_image_dispose( GObject *gobject )
{
#ifdef VIPS_DEBUG
VIPS_DEBUG_MSG( "vips_image_dispose: " );
vips_object_print( VIPS_OBJECT( gobject ) );
#endif /*VIPS_DEBUG*/
vips_object_preclose( VIPS_OBJECT( gobject ) );
G_OBJECT_CLASS( vips_image_parent_class )->dispose( gobject );
}
static void
vips_image_print( VipsObject *object, VipsBuf *buf )
{
VipsImage *image = VIPS_IMAGE( object );
vips_buf_appendf( buf,
ngettext(
"%dx%d %s, %d band, %s",
"%dx%d %s, %d bands, %s",
vips_image_get_bands( image ) ),
vips_image_get_width( image ),
vips_image_get_height( image ),
VIPS_ENUM_NICK( VIPS_TYPE_BAND_FORMAT,
vips_image_get_format( image ) ),
vips_image_get_bands( image ),
VIPS_ENUM_NICK( VIPS_TYPE_INTERPRETATION,
vips_image_get_interpretation( image ) ) );
VIPS_OBJECT_CLASS( vips_image_parent_class )->print( object, buf );
}
static gboolean
vips_format_is_vips( VipsFormatClass *format )
{
return( strcmp( VIPS_OBJECT_CLASS( format )->nickname, "vips" ) == 0 );
}
/* Lazy open.
*/
/* What we track during a delayed open.
*/
typedef struct {
VipsImage *image;
VipsFormatClass *format;/* Read in pixels with this */
char *filename; /* Get pixels from here */
gboolean disc; /* Read via disc requested */
VipsImage *real; /* The real decompressed image */
} Lazy;
static void
lazy_free_cb( Lazy *lazy )
{
VIPS_FREE( lazy->filename );
VIPS_UNREF( lazy->real );
}
static Lazy *
lazy_new( VipsImage *image,
VipsFormatClass *format, const char *filename, gboolean disc )
{
Lazy *lazy;
VIPS_DEBUG_MSG( "lazy_new: \"%s\"\n", filename );
if( !(lazy = VIPS_NEW( image, Lazy )) )
return( NULL );
lazy->image = image;
lazy->format = format;
lazy->filename = NULL;
lazy->disc = disc;
lazy->real = NULL;
g_signal_connect( image, "close", G_CALLBACK( lazy_free_cb ), NULL );
if( !(lazy->filename = im_strdup( NULL, filename )) )
return( NULL );
return( lazy );
}
typedef struct {
const char unit;
int multiplier;
} Unit;
static size_t
parse_size( const char *size_string )
{
static Unit units[] = {
{ 'k', 1024 },
{ 'm', 1024 * 1024 },
{ 'g', 1024 * 1024 * 1024 }
};
size_t size;
int n;
int i, j;
char *unit;
/* An easy way to alloc a buffer large enough.
*/
unit = g_strdup( size_string );
n = sscanf( size_string, "%d %s", &i, unit );
if( n > 0 )
size = i;
if( n > 1 ) {
for( j = 0; j < VIPS_NUMBER( units ); j++ )
if( tolower( unit[0] ) == units[j].unit ) {
size *= units[j].multiplier;
break;
}
}
g_free( unit );
VIPS_DEBUG_MSG( "parse_size: parsed \"%s\" as %zd\n",
size_string, size );
return( size );
}
static size_t
disc_threshold( void )
{
static gboolean done = FALSE;
static size_t threshold;
if( !done ) {
const char *env;
done = TRUE;
/* 100mb default.
*/
threshold = 100 * 1024 * 1024;
if( (env = g_getenv( "IM_DISC_THRESHOLD" )) )
threshold = parse_size( env );
if( im__disc_threshold )
threshold = parse_size( im__disc_threshold );
VIPS_DEBUG_MSG( "disc_threshold: %zd bytes\n", threshold );
}
return( threshold );
}
/* Make the real underlying image: either a direct disc file, or a temp file
* somewhere.
*/
static VipsImage *
lazy_real_image( Lazy *lazy )
{
VipsImage *real;
/* We open to disc if:
* - 'disc' is set
* - disc_threshold() has not been set to zero
* - the format does not support lazy read
* - the image will be more than a megabyte, uncompressed
*/
real = NULL;
if( lazy->disc &&
disc_threshold() &&
!(vips_format_get_flags( lazy->format, lazy->filename ) &
VIPS_FORMAT_PARTIAL) &&
vips_image_size( lazy->image ) > disc_threshold() ) {
if( !(real = vips_image_new_disc_temp( "%s.v" )) )
return( NULL );
VIPS_DEBUG_MSG( "lazy_real_image: "
"opening to disc file \"%s\"\n",
real->filename );
}
/* Otherwise, fall back to a "p".
*/
if( !real &&
!(real = vips_image_new( "p" )) )
return( NULL );
return( real );
}
/* Our start function ... do the lazy open, if necessary, and return a region
* on the new image.
*/
static void *
open_lazy_start( VipsImage *out, void *a, void *dummy )
{
Lazy *lazy = (Lazy *) a;
if( !lazy->real ) {
if( !(lazy->real = lazy_real_image( lazy )) ||
lazy->format->load( lazy->filename, lazy->real ) ||
im_pincheck( lazy->real ) ) {
VIPS_UNREF( lazy->real );
return( NULL );
}
}
return( vips_region_new( lazy->real ) );
}
/* Just copy.
*/
static int
open_lazy_generate( VipsRegion *or, void *seq, void *a, void *b )
{
VipsRegion *ir = (VipsRegion *) seq;
Rect *r = &or->valid;
/* Ask for input we need.
*/
if( vips_region_prepare( ir, r ) )
return( -1 );
/* Attach output region to that.
*/
if( vips_region_region( or, ir, r, r->left, r->top ) )
return( -1 );
return( 0 );
}
/* Lazy open ... init the header with the first OpenLazyFn, delay actually
* decoding pixels with the second OpenLazyFn until the first generate().
*/
static int
vips_image_open_lazy( VipsImage *image,
VipsFormatClass *format, const char *filename, gboolean disc )
{
Lazy *lazy;
if( !(lazy = lazy_new( image, format, filename, disc )) )
return( -1 );
/* Read header fields to init the return image. THINSTRIP since this is
* probably a disc file. We can't tell yet whether we will be opening
* to memory, sadly, so we can't suggest ANY.
*/
if( format->header( filename, image ) ||
im_demand_hint( image, VIPS_DEMAND_STYLE_THINSTRIP, NULL ) )
return( -1 );
/* Then 'start' creates the real image and 'gen' paints 'out' with
* pixels from the real image on demand.
*/
if( im_generate( image,
open_lazy_start, open_lazy_generate, im_stop_one,
lazy, NULL ) )
return( -1 );
return( 0 );
}
/* Lazy save.
*/
/* If we write to (eg.) TIFF, actually do the write
* to a "p" and on "written" do im_vips2tiff() or whatever. Track save
* parameters here.
*/
typedef struct {
int (*save_fn)(); /* Save function */
char *filename; /* Save args */
} SaveBlock;
/* From "written" callback: invoke a delayed save.
*/
static int
vips_image_save_cb( VipsImage *image, SaveBlock *sb )
{
if( sb->save_fn( image, sb->filename ) )
return( -1 );
return( 0 );
}
static void
vips_attach_save( VipsImage *image, int (*save_fn)(), const char *filename )
{
SaveBlock *sb;
if( (sb = VIPS_NEW( image, SaveBlock )) ) {
sb->save_fn = save_fn;
sb->filename = im_strdup( image, filename );
g_signal_connect( image, "written",
G_CALLBACK( vips_image_save_cb ), sb );
}
}
/* Progress feedback.
*/
static int
vips_image_evalstart_cb( VipsImage *image, VipsProgress *progress, int *last )
{
int tile_width;
int tile_height;
int nlines;
*last = -1;
vips_get_tile_size( image,
&tile_width, &tile_height, &nlines );
printf( _( "%s %s: %d threads, %d x %d tiles, groups of %d scanlines" ),
g_get_prgname(), image->filename,
im_concurrency_get(),
tile_width, tile_height, nlines );
printf( "\n" );
return( 0 );
}
static int
vips_image_eval_cb( VipsImage *image, VipsProgress *progress, int *last )
{
if( progress->percent != *last ) {
printf( _( "%s %s: %d%% complete" ),
g_get_prgname(), image->filename,
progress->percent );
printf( "\r" );
fflush( stdout );
*last = progress->percent;
}
return( 0 );
}
static int
vips_image_evalend_cb( VipsImage *image, VipsProgress *progress )
{
/* Spaces at end help to erase the %complete message we overwrite.
*/
printf( _( "%s %s: done in %ds \n" ),
g_get_prgname(), image->filename, progress->run );
return( 0 );
}
/* Attach progress feedback, if required.
*/
static void
vips_image_add_progress( VipsImage *image )
{
if( im__progress ||
g_getenv( "IM_PROGRESS" ) ) {
/* Keep the %complete we displayed last time here.
*/
int *last = VIPS_NEW( image, int );
g_signal_connect( image, "evalstart",
G_CALLBACK( vips_image_evalstart_cb ), last );
g_signal_connect( image, "eval",
G_CALLBACK( vips_image_eval_cb ), last );
g_signal_connect( image, "evalend",
G_CALLBACK( vips_image_evalend_cb ), NULL );
}
}
static int
vips_image_build( VipsObject *object )
{
VipsImage *image = VIPS_IMAGE( object );
const char *filename = image->filename;
const char *mode = image->mode;
VipsFormatClass *format;
VIPS_DEBUG_MSG( "vips_image_build: %p\n", image );
if( VIPS_OBJECT_CLASS( vips_image_parent_class )->build( object ) )
return( -1 );
/* Parse the mode string.
*/
switch( mode[0] ) {
case 'r':
if( !(format = vips_format_for_file( filename )) )
return( -1 );
if( vips_format_is_vips( format ) ) {
/* We may need to byteswap.
*/
VipsFormatFlags flags =
vips_format_get_flags( format, filename );
gboolean native = (flags & VIPS_FORMAT_BIGENDIAN) ==
im_amiMSBfirst();
if( native ) {
if( vips_image_open_input( image ) )
return( -1 );
if( mode[1] == 'w' )
image->dtype = VIPS_IMAGE_MMAPINRW;
}
else {
VipsImage *x;
if( !(x = vips_image_new( "p" )) )
return( -1 );
vips_object_local( image, x );
if( vips_image_open_input( x ) )
return( -1 );
image->dtype = VIPS_IMAGE_PARTIAL;
if( im_copy_swap( x, image ) )
return( -1 );
}
}
else {
/* Make this a partial, generate into it from the
* converter.
*/
image->dtype = VIPS_IMAGE_PARTIAL;
if( vips_image_open_lazy( image, format,
filename, mode[1] == 'd' ) )
return( -1 );
}
break;
case 'w':
if( !(format = vips_format_for_name( filename )) )
return( -1 );
if( vips_format_is_vips( format ) )
image->dtype = VIPS_IMAGE_OPENOUT;
else {
image->dtype = VIPS_IMAGE_PARTIAL;
vips_attach_save( image,
format->save, filename );
}
break;
case 't':
image->dtype = VIPS_IMAGE_SETBUF;
image->dhint = VIPS_DEMAND_STYLE_ANY;
break;
case 'p':
image->dtype = VIPS_IMAGE_PARTIAL;
break;
case 'a':
/* Check parameters.
*/
if( image->sizeof_header < 0 ) {
vips_error( "vips_image_open_raw",
"%s", _( "bad parameters" ) );
return( -1 );
}
if( (image->fd = im__open_image_file( filename )) == -1 )
return( -1 );
image->dtype = VIPS_IMAGE_OPENIN;
image->dhint = VIPS_DEMAND_STYLE_THINSTRIP;
if( image->Bands == 1 )
image->Type = VIPS_INTERPRETATION_B_W;
else if( image->Bands == 3 )
image->Type = VIPS_INTERPRETATION_RGB;
else
image->Type = VIPS_INTERPRETATION_MULTIBAND;
/* Read the real file length and check against what we think
* the size should be.
*/
if( (image->file_length = im_file_length( image->fd )) == -1 )
return( -1 );
/* Very common, so a special message.
*/
if( image->file_length < vips_image_size( image ) ) {
vips_error( "VipsImage",
_( "unable to open %s: file too short" ),
image->filename );
return( -1 );
}
/* Just weird. Only print a warning for this, since we should
* still be able to process it without coredumps.
*/
if( image->file_length > vips_image_size( image ) )
vips_warn( "VipsImage",
_( "%s is longer than expected" ),
image->filename );
break;
case 'm':
if( image->Bands == 1 )
image->Type = VIPS_INTERPRETATION_B_W;
else if( image->Bands == 3 )
image->Type = VIPS_INTERPRETATION_RGB;
else
image->Type = VIPS_INTERPRETATION_MULTIBAND;
image->dtype = VIPS_IMAGE_SETBUF_FOREIGN;
break;
default:
vips_error( "VipsImage", _( "bad mode \"%s\"" ), mode );
return( -1 );
}
vips_image_add_progress( image );
#ifdef DEBUG_VIPS
printf( "vips_image_build: " );
vips_object_dump( VIPS_OBJECT( image ) );
#endif /*DEBUG_VIPS*/
return( 0 );
}
static void *
vips_region_invalidate( VipsRegion *reg )
{
reg->invalid = TRUE;
return( NULL );
}
static void
vips_image_real_invalidate( VipsImage *image )
{
#ifdef DEBUG_VIPS
printf( "vips_image_real_invalidate: " );
vips_object_dump( VIPS_OBJECT( image ) );
#endif /*DEBUG_VIPS*/
g_mutex_lock( image->sslock );
(void) im_slist_map2( image->regions,
(VSListMap2Fn) vips_region_invalidate, NULL, NULL );
g_mutex_unlock( image->sslock );
}
static void
vips_image_class_init( VipsImageClass *class )
{
GObjectClass *gobject_class = G_OBJECT_CLASS( class );
VipsObjectClass *vobject_class = VIPS_OBJECT_CLASS( class );
GParamSpec *pspec;
/* Pass in a nonsense name for argv0 ... this init world is only here
* for old programs which are missing an im_init_world() call. We must
* have threads set up before we can process.
*/
if( vips_init( "vips" ) )
vips_error_clear();
gobject_class->finalize = vips_image_finalize;
gobject_class->dispose = vips_image_dispose;
gobject_class->set_property = vips_object_set_property;
gobject_class->get_property = vips_object_get_property;
vobject_class->nickname = "image";
vobject_class->description = _( "VIPS image class" );
vobject_class->print = vips_image_print;
vobject_class->build = vips_image_build;
class->invalidate = vips_image_real_invalidate;
/* Create properties.
*/
/* Width / height / bands can be zero for unintialised.
*/
pspec = g_param_spec_int( "width", "Width",
_( "Image width in pixels" ),
0, 1000000, 0,
G_PARAM_READWRITE );
g_object_class_install_property( gobject_class, PROP_WIDTH, pspec );
vips_object_class_install_argument( vobject_class, pspec,
VIPS_ARGUMENT_SET_ONCE,
G_STRUCT_OFFSET( VipsImage, Xsize ) );
pspec = g_param_spec_int( "height", "Height",
_( "Image height in pixels" ),
0, 1000000, 0,
G_PARAM_READWRITE );
g_object_class_install_property( gobject_class, PROP_HEIGHT, pspec );
vips_object_class_install_argument( vobject_class, pspec,
VIPS_ARGUMENT_SET_ONCE,
G_STRUCT_OFFSET( VipsImage, Ysize ) );
pspec = g_param_spec_int( "bands", "Bands",
_( "Number of bands in image" ),
0, 1000000, 0,
G_PARAM_READWRITE );
g_object_class_install_property( gobject_class, PROP_BANDS, pspec );
vips_object_class_install_argument( vobject_class, pspec,
VIPS_ARGUMENT_SET_ONCE,
G_STRUCT_OFFSET( VipsImage, Bands ) );
pspec = g_param_spec_enum( "format", "Format",
_( "Pixel format in image" ),
VIPS_TYPE_BAND_FORMAT, VIPS_FORMAT_UCHAR,
G_PARAM_READWRITE );
g_object_class_install_property( gobject_class, PROP_FORMAT, pspec );
vips_object_class_install_argument( vobject_class, pspec,
VIPS_ARGUMENT_SET_ONCE,
G_STRUCT_OFFSET( VipsImage, BandFmt ) );
pspec = g_param_spec_string( "filename", "Filename",
_( "Image filename" ),
NULL,
G_PARAM_READWRITE );
g_object_class_install_property( gobject_class, PROP_FILENAME, pspec );
vips_object_class_install_argument( vobject_class, pspec,
VIPS_ARGUMENT_CONSTRUCT,
G_STRUCT_OFFSET( VipsImage, filename ) );
pspec = g_param_spec_string( "mode", "Mode",
_( "Open mode" ),
"p", /* Default to partial */
G_PARAM_READWRITE );
g_object_class_install_property( gobject_class, PROP_MODE, pspec );
vips_object_class_install_argument( vobject_class, pspec,
VIPS_ARGUMENT_CONSTRUCT,
G_STRUCT_OFFSET( VipsImage, mode ) );
pspec = g_param_spec_boolean( "kill", "Kill",
_( "Block evaluation on this image" ),
FALSE,
G_PARAM_READWRITE );
g_object_class_install_property( gobject_class, PROP_KILL, pspec );
vips_object_class_install_argument( vobject_class, pspec,
VIPS_ARGUMENT_NONE,
G_STRUCT_OFFSET( VipsImage, kill ) );
pspec = g_param_spec_enum( "demand", "Demand",
_( "Preferred demand style for this image" ),
VIPS_TYPE_DEMAND_STYLE, VIPS_DEMAND_STYLE_SMALLTILE,
G_PARAM_READWRITE );
g_object_class_install_property( gobject_class, PROP_DEMAND, pspec );
vips_object_class_install_argument( vobject_class, pspec,
VIPS_ARGUMENT_NONE,
G_STRUCT_OFFSET( VipsImage, dhint ) );
pspec = g_param_spec_int( "sizeof_header", "Size of header",
_( "Offset in bytes from start of file" ),
0, 1000000, IM_SIZEOF_HEADER,
G_PARAM_READWRITE );
g_object_class_install_property( gobject_class,
PROP_SIZEOF_HEADER, pspec );
vips_object_class_install_argument( vobject_class, pspec,
VIPS_ARGUMENT_SET_ONCE | VIPS_ARGUMENT_CONSTRUCT,
G_STRUCT_OFFSET( VipsImage, sizeof_header ) );
pspec = g_param_spec_pointer( "foreign_buffer", "Foreign buffer",
"Pointer to foreign pixels",
G_PARAM_READWRITE );
g_object_class_install_property( gobject_class,
PROP_FOREIGN_BUFFER, pspec );
vips_object_class_install_argument( vobject_class, pspec,
VIPS_ARGUMENT_SET_ONCE | VIPS_ARGUMENT_CONSTRUCT,
G_STRUCT_OFFSET( VipsImage, data ) );
/* Create signals.
*/
vips_image_signals[SIG_PREEVAL] = g_signal_new( "preeval",
G_TYPE_FROM_CLASS( class ),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET( VipsImageClass, preeval ),
NULL, NULL,
g_cclosure_marshal_VOID__VOID,
G_TYPE_NONE, 0 );
vips_image_signals[SIG_EVAL] = g_signal_new( "eval",
G_TYPE_FROM_CLASS( class ),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET( VipsImageClass, eval ),
NULL, NULL,
g_cclosure_marshal_VOID__VOID,
G_TYPE_NONE, 0 );
vips_image_signals[SIG_POSTEVAL] = g_signal_new( "posteval",
G_TYPE_FROM_CLASS( class ),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET( VipsImageClass, posteval ),
NULL, NULL,
g_cclosure_marshal_VOID__VOID,
G_TYPE_NONE, 0 );
vips_image_signals[SIG_WRITTEN] = g_signal_new( "written",
G_TYPE_FROM_CLASS( class ),
G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
G_STRUCT_OFFSET( VipsImageClass, written ),
NULL, NULL,
g_cclosure_marshal_VOID__VOID,
G_TYPE_NONE, 0 );
vips_image_signals[SIG_INVALIDATE] = g_signal_new( "invalidate",
G_TYPE_FROM_CLASS( class ),
G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
G_STRUCT_OFFSET( VipsImageClass, invalidate ),
NULL, NULL,
g_cclosure_marshal_VOID__VOID,
G_TYPE_NONE, 0 );
}
static void
vips_image_init( VipsImage *image )
{
/* Init to 0 is fine for most header fields.
*/
/* Default to native order.
*/
image->magic = im_amiMSBfirst() ? VIPS_MAGIC_SPARC : VIPS_MAGIC_INTEL;
image->fd = -1; /* since 0 is stdout */
image->sslock = g_mutex_new ();
image->sizeof_header = IM_SIZEOF_HEADER;
}
/* Set of access functions.
*/
int
vips_image_get_width( VipsImage *image )
{
return( image->Xsize );
}
int
vips_image_get_height( VipsImage *image )
{
return( image->Ysize );
}
int
vips_image_get_bands( VipsImage *image )
{
return( image->Bands );
}
VipsBandFormat
vips_image_get_format( VipsImage *image )
{
return( image->BandFmt );
}
VipsCoding
vips_image_get_coding( VipsImage *image )
{
return( image->Coding );
}
VipsInterpretation
vips_image_get_interpretation( VipsImage *image )
{
return( image->Type );
}
double
vips_image_get_xres( VipsImage *image )
{
return( image->Xres );
}
double
vips_image_get_yres( VipsImage *image )
{
return( image->Yres );
}
int
vips_image_get_xoffset( VipsImage *image )
{
return( image->Xoffset );
}
int
vips_image_get_yoffset( VipsImage *image )
{
return( image->Yoffset );
}
size_t
vips_image_size( VipsImage *image )
{
return( VIPS_IMAGE_SIZEOF_LINE( image ) * image->Ysize );
}
void
vips_image_written( VipsImage *image )
{
#ifdef VIPS_DEBUG
printf( "vips_image_written: " );
vips_object_print( VIPS_OBJECT( image ) );
#endif /*VIPS_DEBUG*/
g_signal_emit( image, vips_image_signals[SIG_WRITTEN], 0 );
}
void
vips_image_invalidate( VipsImage *image )
{
#ifdef VIPS_DEBUG
printf( "vips_image_invalidate: " );
vips_object_print( VIPS_OBJECT( image ) );
#endif /*VIPS_DEBUG*/
g_signal_emit( image, vips_image_signals[SIG_INVALIDATE], 0 );
}
static void *
vips_image_invalidate_all_cb( VipsImage *image )
{
vips_image_invalidate( image );
return( NULL );
}
/**
* vips_image_invalidate_all:
* @image: #VipsImage to invalidate
*
* Invalidate all pixel caches on an @image and any derived images. The
* "invalidate" callback is triggered for all invalidated images.
*/
void
vips_image_invalidate_all( VipsImage *image )
{
(void) im__link_map( image,
(VSListMap2Fn) vips_image_invalidate_all_cb, NULL, NULL );
}
/* Attach a new time struct, if necessary, and reset it.
*/
static int
vips_progress_add( VipsImage *image )
{
VipsProgress *progress;
if( !image->time &&
!(image->time = VIPS_NEW( NULL, VipsProgress )) )
return( -1 );
progress = image->time;
if( !progress->start )
progress->start = g_timer_new();
progress->im = image;
g_timer_start( progress->start );
progress->run = 0;
progress->eta = 0;
progress->tpels = (gint64) image->Xsize * image->Ysize;
progress->npels = 0;
progress->percent = 0;
return( 0 );
}
void
vips_image_preeval( VipsImage *image )
{
if( image->progress ) {
#ifdef VIPS_DEBUG
printf( "vips_image_preeval: " );
vips_object_print( VIPS_OBJECT( image ) );
#endif /*VIPS_DEBUG*/
g_assert( !im_image_sanity( image->progress ) );
(void) vips_progress_add( image->progress );
g_signal_emit( image->progress,
vips_image_signals[SIG_PREEVAL], 0, image->time );
}
}
/* Another w * h pixels have been processed.
*/
void
vips_image_eval( VipsImage *image, int w, int h )
{
if( image->progress ) {
VipsProgress *progress = image->time;
float prop;
#ifdef VIPS_DEBUG
printf( "vips_image_eval: " );
vips_object_print( VIPS_OBJECT( image ) );
#endif /*VIPS_DEBUG*/
g_assert( !im_image_sanity( image->progress ) );
progress->run = g_timer_elapsed( progress->start, NULL );
progress->npels += w * h;
prop = (float) progress->npels / (float) progress->tpels;
progress->percent = 100 * prop;
if( prop > 0.1 )
progress->eta = (1.0 / prop) * progress->run -
progress->run;
g_signal_emit( image->progress,
vips_image_signals[SIG_EVAL], 0, progress );
}
}
void
vips_image_posteval( VipsImage *image )
{
if( image->progress ) {
#ifdef VIPS_DEBUG
printf( "vips_image_posteval: " );
vips_object_print( VIPS_OBJECT( image ) );
#endif /*VIPS_DEBUG*/
g_assert( !im_image_sanity( image->progress ) );
g_signal_emit( image->progress,
vips_image_signals[SIG_POSTEVAL], 0, image->time );
}
}
gboolean
vips_image_get_kill( VipsImage *image )
{
/* Has kill been set for this image? If yes, abort evaluation.
*/
if( image->kill )
vips_error( "vips_image_test_kill",
_( "killed for image \"%s\"" ), image->filename );
return( image->kill );
}
void
vips_image_set_kill( VipsImage *image, gboolean kill )
{
if( !image->kill )
VIPS_DEBUG_MSG( "vips_image_set_kill: %s\n", image->filename );
image->kill = kill;
}
/**
* vips_image_new:
* @mode: mode to open with
*
* vips_image_new() examines the mode string and creates an
* appropriate #VipsImage.
*
* <itemizedlist>
* <listitem>
* <para>
* <emphasis>"t"</emphasis>
* creates a temporary memory buffer image.
* </para>
* </listitem>
* <listitem>
* <para>
* <emphasis>"p"</emphasis>
* creates a "glue" descriptor you can use to join two image
* processing operations together.
* </para>
* </listitem>
* </itemizedlist>
*
* Returns: the new #VipsImage, or %NULL on error.
*/
VipsImage *
vips_image_new( const char *mode )
{
VipsImage *image;
image = VIPS_IMAGE( g_object_new( VIPS_TYPE_IMAGE, NULL ) );
g_object_set( image,
"mode", mode,
NULL );
if( vips_object_build( VIPS_OBJECT( image ) ) ) {
VIPS_UNREF( image );
return( NULL );
}
return( image );
}
/**
* vips_image_new_from_file:
* @filename: file to open
* @mode: mode to open with
*
* vips_image_new_from_file() examines the mode string and creates an
* appropriate #VipsImage.
*
* <itemizedlist>
* <listitem>
* <para>
* <emphasis>"r"</emphasis>
* opens the named file for reading. If the file is not in the native
* VIPS format for your machine, vips_image_new_from_file()
* automatically converts the file for you in memory.
*
* For some large files (eg. TIFF) this may
* not be what you want, it can fill memory very quickly. Instead, you
* can either use "rd" mode (see below), or you can use the lower-level
* API and control the loading process yourself. See
* #VipsBandFormat.
*
* vips_image_new_from_file() can read files in most formats.
*
* Note that <emphasis>"r"</emphasis> mode works in at least two stages.
* It should return quickly and let you check header fields. It will
* only actually read in pixels when you first access them.
* </para>
* </listitem>
* <listitem>
* <para>
* <emphasis>"rd"</emphasis>
* opens the named file for reading. If the uncompressed image is larger
* than a threshold and the file format does not support random access,
* rather than uncompressing to memory, vips_image_new_from_file() will
* uncompress to a temporary disc file. This file will be automatically
* deleted when the IMAGE is closed.
*
* See im_system_image() for an explanation of how VIPS selects a
* location for the temporary file.
*
* The disc threshold can be set with the "--vips-disc-threshold"
* command-line argument, or the IM_DISC_THRESHOLD environment variable.
* The value is a simple integer, but can take a unit postfix of "k",
* "m" or "g" to indicate kilobytes, megabytes or gigabytes.
*
* For example:
*
* |[
* vips --vips-disc-threshold "500m" im_copy fred.tif fred.v
* ]|
*
* will copy via disc if "fred.tif" is more than 500 Mbytes
* uncompressed. The default threshold is 100MB.
* </para>
* </listitem>
* <listitem>
* <para>
* <emphasis>"w"</emphasis>
* opens the named file for writing. It looks at the file name
* suffix to determine the type to write -- for example:
*
* |[
* vips_image_new_from_file( "fred.tif", "w" )
* ]|
*
* will write in TIFF format.
* </para>
* </listitem>
* <listitem>
* <para>
* <emphasis>"rw"</emphasis>
* opens the named file for reading and writing. This will only work for
* VIPS files in a format native to your machine. It is only for
* paintbox-type applications.
* </para>
* </listitem>
* </itemizedlist>
*
* Returns: the new #VipsImage, or %NULL on error.
*/
VipsImage *
vips_image_new_from_file( const char *filename, const char *mode )
{
VipsImage *image;
image = VIPS_IMAGE( g_object_new( VIPS_TYPE_IMAGE, NULL ) );
g_object_set( image,
"filename", filename,
"mode", mode,
NULL );
if( vips_object_build( VIPS_OBJECT( image ) ) ) {
VIPS_UNREF( image );
return( NULL );
}
return( image );
}
/**
* vips_image_new_from_file_raw:
* @filename: filename to open
* @xsize: image width
* @ysize: image height
* @bands: image bands (or bytes per pixel)
* @offset: bytes to skip at start of file
*
* This function maps the named file and returns a #VipsImage you can use to
* read it.
*
* It returns an 8-bit image with @bands bands. If the image is not 8-bit, use
* im_copy_set() to transform the descriptor after loading it.
*
* See also: im_copy_set(), im_raw2vips(), vips_image_new_from_file().
*
* Returns: the new #VipsImage, or %NULL on error.
*/
VipsImage *
vips_image_new_from_file_raw( const char *filename,
int xsize, int ysize, int bands, int offset )
{
VipsImage *image;
image = VIPS_IMAGE( g_object_new( VIPS_TYPE_IMAGE, NULL ) );
g_object_set( image,
"filename", filename,
"mode", "a",
"width", xsize,
"height", ysize,
"bands", bands,
"sizeof_header", offset,
NULL );
if( vips_object_build( VIPS_OBJECT( image ) ) ) {
VIPS_UNREF( image );
return( NULL );
}
return( image );
}
/**
* vips_image_new_from_memory:
* @buffer: start of memory area
* @xsize: image width
* @ysize: image height
* @bands: image bands (or bytes per pixel)
* @bandfmt: image format
*
* This function wraps an #IMAGE around a memory buffer. VIPS does not take
* responsibility for the area of memory, it's up to you to make sure it's
* freed when the image is closed. See for example im_add_close_callback().
*
* See also: im_binfile(), im_raw2vips(), im_open().
*
* Returns: the new #VipsImage, or %NULL on error.
*/
VipsImage *
vips_image_new_from_memory( void *buffer,
int xsize, int ysize, int bands, VipsBandFormat bandfmt )
{
VipsImage *image;
image = VIPS_IMAGE( g_object_new( VIPS_TYPE_IMAGE, NULL ) );
g_object_set( image,
"foreign_buffer", buffer,
"mode", "m",
"width", xsize,
"height", ysize,
"bands", bands,
"format", bandfmt,
NULL );
if( vips_object_build( VIPS_OBJECT( image ) ) ) {
VIPS_UNREF( image );
return( NULL );
}
return( image );
}
static void
vips_image_new_temp_cb( VipsImage *image )
{
g_assert( image->filename );
unlink( image->filename );
}
/**
* vips_image_new_disc_temp:
* @format: format of file
*
* Make a "w" disc #VipsImage which will be automatically unlinked when it is
* destroyed. @format is something like "%s.v" for a vips file.
*
* The file is created in the temporary directory, see im__temp_name().
*
* See also: im__temp_name().
*
* Returns: the new #VipsImage, or %NULL on error.
*/
VipsImage *
vips_image_new_disc_temp( const char *format )
{
char *name;
VipsImage *image;
if( !(name = im__temp_name( format )) )
return( NULL );
if( !(image = vips_image_new_from_file( name, "w" )) ) {
g_free( name );
return( NULL );
}
g_free( name );
/* Needs to be postclose so we can rewind after write without
* deleting the file.
*/
g_signal_connect( image, "postclose",
G_CALLBACK( vips_image_new_temp_cb ), NULL );
return( image );
}
/**
* vips_image_isMSBfirst:
* @image: image to test
*
* Return %TRUE if @image is in most-significant-
* byte first form. This is the byte order used on the SPARC
* architecture and others.
*/
gboolean
vips_image_isMSBfirst( VipsImage *image )
{
if( image->magic == VIPS_MAGIC_SPARC )
return( 1 );
else
return( 0 );
}
/**
* vips_image_isfile:
* @image: image to test
*
* Return %TRUE if @image represents a file on disc in some way.
*/
gboolean vips_image_isfile( VipsImage *image )
{
switch( image->dtype ) {
case VIPS_IMAGE_MMAPIN:
case VIPS_IMAGE_MMAPINRW:
case VIPS_IMAGE_OPENOUT:
case VIPS_IMAGE_OPENIN:
return( 1 );
case VIPS_IMAGE_PARTIAL:
case VIPS_IMAGE_SETBUF:
case VIPS_IMAGE_SETBUF_FOREIGN:
case VIPS_IMAGE_NONE:
return( 0 );
default:
g_assert( FALSE );
return( 0 );
}
}
/**
* vips_image_ispartial:
* @image: image to test
*
* Return %TRUE if @im represents a partial image (a delayed calculation).
*/
gboolean
vips_image_ispartial( VipsImage *image )
{
if( image->dtype == VIPS_IMAGE_PARTIAL )
return( 1 );
else
return( 0 );
}
/* This is used by (eg.) IM_IMAGE_SIZEOF_ELEMENT() to calculate object
* size.
*/
const size_t vips__image_sizeof_bandformat[] = {
sizeof( unsigned char ), /* VIPS_FORMAT_UCHAR */
sizeof( signed char ), /* VIPS_FORMAT_CHAR */
sizeof( unsigned short ), /* VIPS_FORMAT_USHORT */
sizeof( unsigned short ), /* VIPS_FORMAT_SHORT */
sizeof( unsigned int ), /* VIPS_FORMAT_UINT */
sizeof( unsigned int ), /* VIPS_FORMAT_INT */
sizeof( float ), /* VIPS_FORMAT_FLOAT */
2 * sizeof( float ), /* VIPS_FORMAT_COMPLEX */
sizeof( double ), /* VIPS_FORMAT_DOUBLE */
2 * sizeof( double ) /* VIPS_FORMAT_DPCOMPLEX */
};
/* Return number of bytes for a band format, or -1 on error.
*/
int
vips_format_sizeof( VipsBandFormat format )
{
return( (format < 0 || format > VIPS_FORMAT_DPCOMPLEX) ?
vips_error( "vips_format_sizeof",
_( "unknown band format %d" ), format ), -1 :
vips__image_sizeof_bandformat[format] );
}
/**
* vips_image_copy_fields_array:
* @out: image to copy to
* @in: %NULL-terminated array of images to copy from
*
* Copy fields from all the input images to the output image. There must be at
* least one input image.
*
* The first input image is used to set the main fields of @out (@XSize, @Coding
* and so on).
*
* Metadata from all the image is merged on to @out, with lower-numbered items
* overriding higher. So for example, if @in[0] and @in[1] both have an item
* called "icc-profile", it's the profile attached to @in[0] that will end up
* on @out.
*
* Image history is completely copied from all @in. @out will have the history
* of all the intput images.
*
* See also: vips_image_copy_fieldsv(), vips_image_copy_fields().
*
* Returns: 0 on success, -1 on error.
*/
int
vips_image_copy_fields_array( IMAGE *out, IMAGE *in[] )
{
int i;
int ni;
g_assert( in[0] );
out->Xsize = in[0]->Xsize;
out->Ysize = in[0]->Ysize;
out->Bands = in[0]->Bands;
out->Bbits = in[0]->Bbits;
out->BandFmt = in[0]->BandFmt;
out->Type = in[0]->Type;
out->Coding = in[0]->Coding;
out->Xres = in[0]->Xres;
out->Yres = in[0]->Yres;
out->Xoffset = 0;
out->Yoffset = 0;
/* Count number of images.
*/
for( ni = 0; in[ni]; ni++ )
;
/* Need to copy last-to-first so that in0 meta will override any
* earlier meta.
*/
im__meta_destroy( out );
for( i = ni - 1; i >= 0; i-- )
if( im__meta_cp( out, in[i] ) )
return( -1 );
/* Merge hists first to last.
*/
for( i = 0; in[i]; i++ )
out->history_list = im__gslist_gvalue_merge( out->history_list,
in[i]->history_list );
return( 0 );
}
/* Max number of images we can handle.
*/
#define MAX_IMAGES (1000)
/**
* vips_image_copy_fieldsv:
* @out: image to copy to
* @in1: first image to copy from
* @Varargs: %NULL-terminated list of images to copy from
*
* Copy fields from all the input images to the output image. A convenience
* function over vips_image_copy_fields_array().
*
* See also: vips_image_copy_fields_array(), vips_image_copy_fields().
*
* Returns: 0 on success, -1 on error.
*/
int
vips_image_copy_fieldsv( IMAGE *out, IMAGE *in1, ... )
{
va_list ap;
int i;
IMAGE *in[MAX_IMAGES];
in[0] = in1;
va_start( ap, in1 );
for( i = 1; i < MAX_IMAGES && (in[i] = va_arg( ap, IMAGE * )); i++ )
;
va_end( ap );
if( i == MAX_IMAGES ) {
vips_error( "im_cp_descv",
"%s", _( "too many images" ) );
return( -1 );
}
return( vips_image_copy_fields_array( out, in ) );
}
/**
* vips_image_copy_fields:
* @out: image to copy to
* @in: image to copy from
*
* Copy fields from @in to @out. A convenience
* function over vips_image_copy_fields_array().
*
* See also: vips_image_copy_fields_array(), vips_image_copy_fieldsv().
*
* Returns: 0 on success, -1 on error.
*/
int
vips_image_copy_fields( IMAGE *out, IMAGE *in )
{
return( vips_image_copy_fieldsv( out, in, NULL ) );
}
int
vips_image_new_array( VipsImage *parent, VipsImage **images, int n )
{
int i;
for( i = 0; i < n; i++ )
if( !(images[i] = vips_image_new( "p" )) )
return( -1 );
return( 0 );
}
/**
* vips_image_init_fields:
* @image: image to init
* @xsize: image width
* @ysize: image height
* @bands: image bands
* @bandfmt: band format
* @coding: image coding
* @type: image type
* @xres: horizontal resolution, pixels per millimetre
* @yres: vertical resolution, pixels per millimetre
* @xo: x offset
* @yo: y offset
*
* A convenience function to set the header fields after creating an image.
* Normally you copy the fields from one of your input images with
* vips_image_copy_fields() and then make
* any adjustments you need, but if you are creating an image from scratch,
* for example im_black() or im_jpeg2vips(), you do need to set all the
* fields yourself.
*
* See also: vips_image_copy_fields().
*/
void
vips_image_init_fields( VipsImage *image,
int xsize, int ysize, int bands,
VipsBandFormat format, VipsCoding coding,
VipsInterpretation interpretation,
float xres, float yres,
int xo, int yo )
{
g_object_set( image,
"width", xsize,
"height", ysize,
"bands", bands,
"format", format,
NULL );
image->Coding = coding;
image->Type = interpretation;
image->Xres = xres;
image->Yres = yres;
image->Xoffset = xo;
image->Yoffset = yo;
}
/**
* vips_image_write_line:
* @image: image to write to
* @ypos: vertical position of scan-line to write
* @linebuffer: scanline of pixels
*
* Write a line of pixels to an image. This function must be called repeatedly
* with @ypos increasing from 0 to @YSize -
* @linebuffer must be IM_IMAGE_SIZEOF_LINE() bytes long.
*
* See also: im_setupout(), im_generate().
*
* Returns: 0 on success, or -1 on error.
*/
int
vips_image_write_line( VipsImage *image, int ypos, PEL *linebuffer )
{
int linesize = VIPS_IMAGE_SIZEOF_LINE( image );
/* Is this the start of eval?
*/
if( ypos == 0 )
vips_image_preeval( image );
/* Possible cases for output: FILE or SETBUF.
*/
switch( image->dtype ) {
case VIPS_IMAGE_SETBUF:
case VIPS_IMAGE_SETBUF_FOREIGN:
memcpy( VIPS_IMAGE_ADDR( image, 0, ypos ),
linebuffer, linesize );
break;
case VIPS_IMAGE_OPENOUT:
/* Don't use ypos for this.
*/
if( im__write( image->fd, linebuffer, linesize ) )
return( -1 );
break;
default:
vips_error( "im_writeline",
_( "unable to output to a %s image" ),
VIPS_ENUM_STRING( VIPS_TYPE_DEMAND_STYLE,
image->dtype ) );
return( -1 );
}
/* Trigger evaluation callbacks for this image.
*/
vips_image_eval( image, image->Xsize, 1 );
if( im__test_kill( image ) )
return( -1 );
/* Is this the end of eval?
*/
if( ypos == image->Ysize - 1 ) {
vips_image_posteval( image );
vips_image_written( image );
}
return( 0 );
}
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