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/* Copyright (C) 2000-2012 by George Williams */
/* 2013jan18..22, several fixes + interlacing, Jose Da Silva */
/*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <fontforge-config.h>
#ifdef _NO_LIBUNGIF
static int a_file_must_define_something=0; /* ANSI says so */
#else /* We can build with gif_lib - therefore import gif files */
#include <basics.h>
#include <string.h>
#include "gimage.h"
#include <gif_lib.h>
#if defined(GIFLIB_MAJOR) && defined(GIFLIB_MINOR) && ((GIFLIB_MAJOR == 5 && GIFLIB_MINOR >= 1) || GIFLIB_MAJOR > 5)
#define _GIFLIB_51PLUS
#endif
static GImage *ProcessSavedImage(GifFileType *gif,struct SavedImage *si,int il) {
/* Process each gif image into an internal FF format. Return NULL if error */
GImage *ret;
struct _GImage *base;
ColorMapObject *m = gif->SColorMap; /* gif_lib.h, NULL if not exists. */
int i,j,k,*id = NULL;
long l;
uint8 *d,*iv = NULL;
/* Create memory to hold image, exit with NULL if not enough memory */
if ( si->ImageDesc.ColorMap!=NULL ) m=si->ImageDesc.ColorMap;
if ( m==NULL )
return( NULL );
if ( m->BitsPerPixel==1 ) {
if ( (ret=GImageCreate(it_bitmap,si->ImageDesc.Width,si->ImageDesc.Height))==NULL )
return( NULL );
if ( m->ColorCount==2 &&
m->Colors[0].Red==0 && m->Colors[0].Green==0 && m->Colors[0].Blue==0 &&
m->Colors[1].Red==255 && m->Colors[1].Green==255 && m->Colors[1].Blue==255 )
/* Don't need a clut */;
else
if ( (ret->u.image->clut = (GClut *) calloc(1,sizeof(GClut)))==NULL ) {
free(ret);
NoMoreMemMessage();
return( NULL );
}
} else
if ( (ret=GImageCreate(it_index,si->ImageDesc.Width,si->ImageDesc.Height))==NULL )
return( NULL );
if ( il && ((id=(int *) malloc(si->ImageDesc.Height*sizeof(int)))==NULL || \
(iv=(uint8 *) malloc(si->ImageDesc.Height*sizeof(uint8)))==NULL) ) {
free(ret->u.image->clut);
free(ret);
free(id);
free(iv);
NoMoreMemMessage();
return( NULL );
}
/* Process gif image into an internal FF usable format */
base = ret->u.image;
if ( base->clut!=NULL ) {
base->clut->clut_len = m->ColorCount;
for ( i=0; i<m->ColorCount; ++i )
base->clut->clut[i] = COLOR_CREATE(m->Colors[i].Red,m->Colors[i].Green,m->Colors[i].Blue);
}
if ( m->BitsPerPixel!=1 )
memcpy(base->data,si->RasterBits,base->width*base->height);
else if ( m->BitsPerPixel==1 ) {
l=0;
for ( i=0; i<base->height; ++i ) {
d = (base->data + i*base->bytes_per_line);
memset(d,'\0',base->bytes_per_line);
for ( j=0; j<base->width; ++j ) {
if ( si->RasterBits[l] )
d[j>>3] |= (1<<(7-(j&7)));
++l;
}
}
}
if ( il ) {
/* Convert interlaced image into a sequential image */
j=0; k=0;
for ( i=0; i<base->height; ++i ) {
id[i]=k;
if ( j==0 ) {
k += 8;
if ( k>=base->height ) {
j++; k=4;
}
} else if ( j==1 ) {
k += 8;
if ( k>=base->height ) {
j++; k=2;
}
} else if ( j==2 ) {
k += 4;
if ( k>=base->height ) {
j++; k=1;
}
} else
k += 2;
}
for ( j=0; j<base->bytes_per_line; ++j ) {
for ( i=1; i<base->height; ++i )
iv[id[i]]=base->data[i*base->bytes_per_line+j];
for ( i=1; i<base->height; ++i )
base->data[i*base->bytes_per_line+j]=iv[i];
}
free(id);
free(iv);
}
for ( i=0; i<si->ExtensionBlockCount; ++i ) {
if ( si->ExtensionBlocks[i].Function==0xf9 &&
si->ExtensionBlocks[i].ByteCount>=4 ) {
base->delay = (si->ExtensionBlocks[i].Bytes[2]<<8) |
(si->ExtensionBlocks[i].Bytes[2]&0xff);
if ( si->ExtensionBlocks[i].Bytes[0]&1 ) {
base->trans = (unsigned char) si->ExtensionBlocks[i].Bytes[3];
if ( base->clut!=NULL )
base->clut->trans_index = base->trans;
}
}
}
return( ret );
}
GImage *GImageReadGif(char *filename) {
/* Import a gif image (or gif animation), else return NULL if error */
GImage *ret, **images;
GifFileType *gif;
int i,il;
//
// MIQ: As at mid 2013 giflib version 4 is still the current
// version in some environments. Given that this function call
// seems to be the only incompatible change in what FontForge uses
// as at that time, I added a smoother macro here to allow v4 to
// still work OK for the time being.
//
#if defined(GIFLIB_MAJOR) && GIFLIB_MAJOR >= 5 || defined(_GIFLIB_5PLUS)
if ( (gif=DGifOpenFileName(filename,NULL))==NULL ) {
#else
if ( (gif=DGifOpenFileName(filename))==NULL ) {
#endif
fprintf( stderr,"Can't open \"%s\"\n",filename );
return( NULL );
}
if ( DGifSlurp(gif)!=GIF_OK ) {
fprintf(stderr,"Bad input file \"%s\"\n",filename );
#ifdef _GIFLIB_51PLUS
DGifCloseFile(gif, NULL);
#else
DGifCloseFile(gif);
#endif
return( NULL );
}
/* Process each image so that it/they can be imported into FF. */
if ( (images=(GImage **) malloc(gif->ImageCount*sizeof(GImage *)))==NULL ) {
#ifdef _GIFLIB_51PLUS
DGifCloseFile(gif, NULL);
#else
DGifCloseFile(gif);
#endif
NoMoreMemMessage();
return( NULL );
}
il=gif->SavedImages[0].ImageDesc.Interlace;
for ( i=0; i<gif->ImageCount; ++i ) {
if ( (images[i]=ProcessSavedImage(gif,&gif->SavedImages[i],il))==NULL ) {
while ( --i>=0 ) free(images[i]);
free(images);
#ifdef _GIFLIB_51PLUS
DGifCloseFile(gif, NULL);
#else
DGifCloseFile(gif);
#endif
return( NULL );
}
}
/* All okay if you reached here. We have 1 image or several images */
if ( gif->ImageCount==1 )
ret = images[0];
else
ret = GImageCreateAnimation(images,gif->ImageCount);
#ifdef _GIFLIB_51PLUS
DGifCloseFile(gif, NULL);
#else
DGifCloseFile(gif);
#endif
free(images);
return( ret );
}
#endif /* ! _NO_LIBUNGIF */
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