316 lines
6.8 KiB
C
316 lines
6.8 KiB
C
/* Convert 1 to 4-band 8 or 16-bit VIPS images to/from PNG.
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*
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* 28/11/03 JC
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* - better no-overshoot on tile loop
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* 22/2/05
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* - read non-interlaced PNG with a line buffer (thanks Michel Brabants)
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* 11/1/06
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* - read RGBA palette-ized images more robustly (thanks Tom)
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* 20/4/06
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* - auto convert to sRGB/mono (with optional alpha) for save
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* 1/5/06
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* - from vips_png.c
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* 2/11/07
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* - use im_wbuffer() API for BG writes
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*/
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/*
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This file is part of VIPS.
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VIPS is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/*
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These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk
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*/
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/*
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#define DEBUG
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif /*HAVE_CONFIG_H*/
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#include <vips/intl.h>
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#ifndef HAVE_PNG
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#include <vips/vips.h>
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int
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im_vips2png( IMAGE *in, const char *filename )
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{
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im_error( "im_vips2png", _( "PNG support disabled" ) );
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return( -1 );
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}
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#else /*HAVE_PNG*/
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#include <stdio.h>
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#include <assert.h>
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#include <stdlib.h>
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#include <vips/vips.h>
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#include <vips/internal.h>
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#include <png.h>
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#ifdef WITH_DMALLOC
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#include <dmalloc.h>
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#endif /*WITH_DMALLOC*/
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#if PNG_LIBPNG_VER < 10003
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#error "PNG library too old."
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#endif
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static void
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user_error_function( png_structp png_ptr, png_const_charp error_msg )
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{
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im_error( "im_vips2png", _( "PNG error: \"%s\"" ), error_msg );
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}
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static void
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user_warning_function( png_structp png_ptr, png_const_charp warning_msg )
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{
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im_error( "im_vips2png", _( "PNG warning: \"%s\"" ), warning_msg );
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}
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/* What we track during a PNG write.
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*/
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typedef struct {
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IMAGE *in;
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im_threadgroup_t *tg;
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FILE *fp;
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png_structp pPng;
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png_infop pInfo;
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png_bytep *row_pointer;
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} Write;
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static void
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write_destroy( Write *write )
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{
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IM_FREEF( im_threadgroup_free, write->tg );
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IM_FREEF( im_close, write->in );
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IM_FREEF( fclose, write->fp );
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if( write->pPng )
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png_destroy_write_struct( &write->pPng, &write->pInfo );
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IM_FREE( write->row_pointer );
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im_free( write );
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}
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static Write *
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write_new( IMAGE *in )
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{
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Write *write;
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if( !(write = IM_NEW( NULL, Write )) )
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return( NULL );
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memset( write, 0, sizeof( Write ) );
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if( !(write->in = im__convert_saveable( in, IM__RGBA )) ) {
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im_error( "im_vips2png",
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"%s", _( "unable to convert to RGB for save" ) );
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write_destroy( write );
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return( NULL );
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}
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write->tg = im_threadgroup_create( write->in );
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write->row_pointer = IM_ARRAY( NULL, write->tg->nlines, png_bytep );
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write->fp = NULL;
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write->pPng = NULL;
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write->pInfo = NULL;
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if( !write->tg || !write->row_pointer ) {
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write_destroy( write );
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return( NULL );
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}
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if( !(write->pPng = png_create_write_struct(
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PNG_LIBPNG_VER_STRING, NULL,
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user_error_function, user_warning_function )) ) {
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write_destroy( write );
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return( NULL );
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}
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/* Catch PNG errors from png_create_info_struct().
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*/
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if( setjmp( write->pPng->jmpbuf ) ) {
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write_destroy( write );
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return( NULL );
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}
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if( !(write->pInfo = png_create_info_struct( write->pPng )) ) {
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write_destroy( write );
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return( NULL );
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}
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return( write );
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}
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static int
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write_png_block( REGION *region, Rect *area, void *a, void *b )
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{
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Write *write = (Write *) a;
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int i;
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/* Catch PNG errors. Yuk.
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*/
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if( setjmp( write->pPng->jmpbuf ) )
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return( -1 );
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for( i = 0; i < area->height; i++ )
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write->row_pointer[i] = (png_bytep)
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IM_REGION_ADDR( region, 0, area->top + i );
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png_write_rows( write->pPng, write->row_pointer, area->height );
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return( 0 );
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}
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/* Write a VIPS image to PNG.
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*/
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static int
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write_vips( Write *write, int compress, int interlace )
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{
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IMAGE *in = write->in;
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int i, nb_passes;
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assert( in->BandFmt == IM_BANDFMT_UCHAR );
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assert( in->Coding == IM_CODING_NONE );
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assert( in->Bands > 0 && in->Bands < 5 );
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/* Catch PNG errors.
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*/
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if( setjmp( write->pPng->jmpbuf ) )
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return( -1 );
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/* Check input image.
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*/
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if( im_pincheck( in ) )
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return( -1 );
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if( compress < 0 || compress > 9 ) {
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im_error( "im_vips2png",
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"%s", _( "compress should be in [0,9]" ) );
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return( -1 );
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}
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/* Set compression parameters.
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*/
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png_set_compression_level( write->pPng, compress );
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write->pInfo->width = in->Xsize;
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write->pInfo->height = in->Ysize;
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write->pInfo->bit_depth = (in->BandFmt == IM_BANDFMT_UCHAR ? 8 : 16);
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write->pInfo->gamma = (float) 1.0;
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switch( in->Bands ) {
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case 1: write->pInfo->color_type = PNG_COLOR_TYPE_GRAY; break;
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case 2: write->pInfo->color_type = PNG_COLOR_TYPE_GRAY_ALPHA; break;
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case 3: write->pInfo->color_type = PNG_COLOR_TYPE_RGB; break;
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case 4: write->pInfo->color_type = PNG_COLOR_TYPE_RGB_ALPHA; break;
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default:
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assert( 0 );
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}
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png_write_info( write->pPng, write->pInfo );
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/* If we're an intel byte order CPU and this is a 16bit image, we need
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* to swap bytes.
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*/
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if( write->pInfo->bit_depth > 8 && !im_amiMSBfirst() )
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png_set_swap( write->pPng );
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if( interlace )
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nb_passes = png_set_interlace_handling( write->pPng );
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else
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nb_passes = 1;
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/* Write data.
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*/
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for( i = 0; i < nb_passes; i++ )
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if( im_wbuffer( write->tg, write_png_block, write, NULL ) )
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return( -1 );
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/* The setjmp() was held by our background writer: reset it.
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*/
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if( setjmp( write->pPng->jmpbuf ) )
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return( -1 );
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png_write_end( write->pPng, write->pInfo );
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return( 0 );
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}
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/* Write a VIPS image to a file as PNG.
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*/
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int
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im_vips2png( IMAGE *in, const char *filename )
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{
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Write *write;
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int compress;
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int interlace;
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char *p, *q;
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char name[FILENAME_MAX];
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char mode[FILENAME_MAX];
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char buf[FILENAME_MAX];
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if( !(write = write_new( in )) )
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return( -1 );
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/* Extract write mode from filename and parse.
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*/
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im_filename_split( filename, name, mode );
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strcpy( buf, mode );
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p = &buf[0];
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compress = 6;
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interlace = 0;
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if( (q = im_getnextoption( &p )) )
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compress = atoi( q );
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if( (q = im_getnextoption( &p )) )
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interlace = atoi( q );
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/* Make output.
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*/
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if( !(write->fp = im__file_open_write( name )) ) {
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write_destroy( write );
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return( -1 );
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}
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png_init_io( write->pPng, write->fp );
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/* Convert it!
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*/
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if( write_vips( write, compress, interlace ) ) {
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write_destroy( write );
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im_error( "im_vips2png", _( "unable to write \"%s\"" ), name );
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return( -1 );
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}
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write_destroy( write );
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return( 0 );
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}
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#endif /*HAVE_PNG*/
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