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gimagewritejpeg.c
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gimagewritejpeg.c
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/* Copyright (C) 2000-2012 by George Williams */
/*
* 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_LIBJPEG
static int a_file_must_define_something=0; /* ANSI says so */
#else
#include <sys/types.h>
#include <stdio.h>
#include <jpeglib.h>
#include <jerror.h>
#include <setjmp.h>
#include "gimage.h"
/******************************************************************************/
struct my_error_mgr {
struct jpeg_error_mgr pub; /* "public" fields */
jmp_buf setjmp_buffer; /* for return to caller */
int padding[8]; /* On my solaris box jmp_buf is the wrong size */
};
typedef struct my_error_mgr * my_error_ptr;
METHODDEF(void)
my_error_exit (j_common_ptr cinfo)
{
/* cinfo->err really points to a my_error_mgr struct, so coerce pointer */
my_error_ptr myerr = (my_error_ptr) cinfo->err;
/* Always display the message. */
/* We could postpone this until after returning, if we chose. */
(*cinfo->err->output_message) (cinfo);
/* Return control to the setjmp point */
longjmp(myerr->setjmp_buffer, 1);
}
static void transferImageToBuffer(struct _GImage *base,JSAMPLE *buffer,int w,int ypos) {
JSAMPLE *pt, *end;
uint32 *ppt;
ppt = (uint32 *) (base->data + ypos*base->bytes_per_line);
if ( base->image_type==it_index && base->clut==NULL ) {
unsigned char *px = (unsigned char *) ppt; int col;
register int bit=0x80;
for ( pt = buffer, end = pt+3*w; pt<end; ) {
if ( *px&bit ) col = 0xffffff;
else col = 0;
if (( bit >>= 1 )== 0 ) { ++px; bit = 0x80; }
*pt++ = COLOR_RED(col);
*pt++ = COLOR_GREEN(col);
*pt++ = COLOR_BLUE(col);
}
} else if ( base->image_type==it_index ) {
unsigned char *px = (unsigned char *) ppt; int col;
register int bit=0x80;
for ( pt = buffer, end = pt+3*w; pt<end; ) {
if ( *px&bit ) col = base->clut->clut[1];
else col = base->clut->clut[0];
if (( bit >>= 1 )== 0 ) { ++px; bit = 0x80; }
*pt++ = COLOR_RED(col);
*pt++ = COLOR_GREEN(col);
*pt++ = COLOR_BLUE(col);
}
} else if ( base->image_type==it_index ) {
unsigned char *px = (unsigned char *) ppt; int col;
for ( pt = buffer, end = pt+3*w; pt<end; ) {
col = base->clut->clut[ *px++ ];
*pt++ = COLOR_RED(col);
*pt++ = COLOR_GREEN(col);
*pt++ = COLOR_BLUE(col);
}
} else {
for ( pt = buffer, end = pt+3*w; pt<end; ++ppt) {
*pt++ = COLOR_RED(*ppt);
*pt++ = COLOR_GREEN(*ppt);
*pt++ = COLOR_BLUE(*ppt);
}
}
}
static void setColorSpace(struct jpeg_compress_struct *cinfo, struct _GImage *base) {
int i;
cinfo->input_components = 3; /* # of color components per pixel */
cinfo->in_color_space = JCS_RGB; /* colorspace of input image */
if ( base->image_type==it_index ) {
if ( base->clut->clut_len!=256 )
return;
for ( i=0; i<256; ++i )
if ( base->clut->clut[i]!=COLOR_CREATE(i,i,i))
break;
if ( i==256 ) {
cinfo->input_components = 1;
cinfo->in_color_space = JCS_GRAYSCALE;
}
}
}
/* quality is a number between 0 and 100 */
int GImageWrite_Jpeg(GImage *gi, FILE *outfile, int quality, int progressive) {
struct _GImage *base = gi->list_len==0?gi->u.image:gi->u.images[0];
struct jpeg_compress_struct cinfo;
struct my_error_mgr jerr;
JSAMPROW row_pointer[1]; /* pointer to JSAMPLE row[s] */
cinfo.err = jpeg_std_error(&jerr.pub);
jerr.pub.error_exit = my_error_exit;
if (setjmp(jerr.setjmp_buffer)) {
jpeg_destroy_compress(&cinfo);
return 0;
}
jpeg_CreateCompress(&cinfo,JPEG_LIB_VERSION,(size_t) sizeof(struct jpeg_compress_struct));
jpeg_stdio_dest(&cinfo, outfile);
cinfo.image_width = base->width;
cinfo.image_height = base->height;
setColorSpace(&cinfo,base);
jpeg_set_defaults(&cinfo);
jpeg_set_quality(&cinfo, quality, TRUE );
if ( progressive )
jpeg_simple_progression(&cinfo);
jpeg_start_compress(&cinfo, TRUE);
if ( cinfo.in_color_space != JCS_GRAYSCALE )
row_pointer[0] = (JSAMPROW) galloc(3*base->width);
while (cinfo.next_scanline < cinfo.image_height) {
if ( cinfo.in_color_space == JCS_GRAYSCALE )
row_pointer[0] = (unsigned char *) (base->data + cinfo.next_scanline*base->bytes_per_line);
else
transferImageToBuffer(base,row_pointer[0],base->width,cinfo.next_scanline);
(void) jpeg_write_scanlines(&cinfo, row_pointer, 1);
}
jpeg_finish_compress(&cinfo);
jpeg_destroy_compress(&cinfo);
if ( cinfo.in_color_space != JCS_GRAYSCALE )
gfree(row_pointer[0]);
return( 1 );
}
int GImageWriteJpeg(GImage *gi, char *filename, int quality, int progressive) {
FILE * outfile; /* target file */
int ret;
if ((outfile = fopen(filename, "wb")) == NULL) {
fprintf(stderr, "can't open %s\n", filename);
return(0);
}
ret = GImageWrite_Jpeg(gi,outfile,quality,progressive);
fclose(outfile);
return( ret );
}
#endif