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Extract shared pdfload/svgload code into cairo.c

This commit is contained in:
Felix Bünemann 2016-05-08 23:26:10 +02:00
parent bec6b174c9
commit 6418ab2307
3 changed files with 69 additions and 28 deletions
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1
libvips/foreign/Makefile.am
View File

@ -2,6 +2,7 @@ noinst_LTLIBRARIES = libforeign.la
libforeign_la_SOURCES = \
gifload.c \
cairo.c \
pdfload.c \
svgload.c \
radiance.h \

68
libvips/foreign/cairo.c Normal file
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@ -0,0 +1,68 @@
/* Shared code for cairo based loaders like svgload and pdfload.
*/
/*
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
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif /*HAVE_CONFIG_H*/
#if defined(HAVE_RSVG) || defined(HAVE_POPPLER)
#include <vips/vips.h>
#include <vips/internal.h>
/* Convert from ARGB to RGBA and undo premultiplication.
*/
void
vips__cairo2rgba( guint32 * restrict buf, int n )
{
int i;
for( i = 0; i < n; i++ ) {
guint32 * restrict p = buf + i;
guint32 x = *p;
guint8 a = x >> 24;
VipsPel * restrict out = (VipsPel *) p;
if( a == 255 )
*p = GUINT32_TO_BE( (x << 8) | 255 );
else if( a == 0 )
*p = GUINT32_TO_BE( x << 8 );
else {
/* Undo premultiplication.
*/
out[0] = 255 * ((x >> 16) & 255) / a;
out[1] = 255 * ((x >> 8) & 255) / a;
out[2] = 255 * (x & 255) / a;
out[3] = a;
}
}
}
#endif

28
libvips/foreign/svgload.c
View File

@ -149,34 +149,6 @@ vips_foreign_load_svg_header( VipsForeignLoad *load )
return( 0 );
}
/* Convert from ARGB to RGBA and undo premultiplication.
*/
void
vips__cairo2rgba( guint32 * restrict buf, int n )
{
int i;
for( i = 0; i < n; i++ ) {
guint32 * restrict p = buf + i;
guint32 x = *p;
guint8 a = x >> 24;
VipsPel * restrict out = (VipsPel *) p;
if( a == 255 )
*p = GUINT32_TO_BE( (x << 8) | 255 );
else if( a == 0 )
*p = GUINT32_TO_BE( x << 8 );
else {
/* Undo premultiplication.
*/
out[0] = 255 * ((x >> 16) & 255) / a;
out[1] = 255 * ((x >> 8) & 255) / a;
out[2] = 255 * (x & 255) / a;
out[3] = a;
}
}
}
static int
vips_foreign_load_svg_generate( VipsRegion *or,
void *seq, void *a, void *b, gboolean *stop )