mirror of https://github.com/koreader/koreader
You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
85 lines
2.5 KiB
C
85 lines
2.5 KiB
C
/*
|
|
KindlePDFViewer: JPEG support for Picture Viewer module
|
|
Copyright (C) 2012 Tigran Aivazian <tigran@bibles.org.uk>
|
|
|
|
This program is free software: you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation, either version 3 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 General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#include <stdint.h>
|
|
#include <string.h>
|
|
#include <setjmp.h>
|
|
#include <stdio.h>
|
|
|
|
#include "jpeglib.h"
|
|
|
|
struct my_error_mgr {
|
|
struct jpeg_error_mgr pub;
|
|
jmp_buf setjmp_buffer;
|
|
};
|
|
|
|
typedef struct my_error_mgr *my_error_ptr;
|
|
|
|
METHODDEF(void) my_error_exit(j_common_ptr cinfo)
|
|
{
|
|
my_error_ptr myerr = (my_error_ptr) cinfo->err;
|
|
(*cinfo->err->output_message) (cinfo);
|
|
longjmp(myerr->setjmp_buffer, 1);
|
|
}
|
|
|
|
uint8_t *jpegLoadFile(const char *fname, int *width, int *height, int *components)
|
|
{
|
|
struct jpeg_decompress_struct cinfo;
|
|
struct my_error_mgr jerr;
|
|
FILE *infile;
|
|
JSAMPARRAY buffer;
|
|
int row_stride;
|
|
long cont;
|
|
JSAMPLE *image_buffer;
|
|
|
|
if ((infile = fopen(fname, "r")) == NULL) return NULL;
|
|
cinfo.err = jpeg_std_error(&jerr.pub);
|
|
jerr.pub.error_exit = my_error_exit;
|
|
if (setjmp(jerr.setjmp_buffer)) {
|
|
jpeg_destroy_decompress(&cinfo);
|
|
fclose(infile);
|
|
return NULL;
|
|
}
|
|
jpeg_create_decompress(&cinfo);
|
|
jpeg_stdio_src(&cinfo, infile);
|
|
(void) jpeg_read_header(&cinfo, TRUE);
|
|
(void) jpeg_start_decompress(&cinfo);
|
|
row_stride = cinfo.output_width * cinfo.output_components;
|
|
buffer = (*cinfo.mem->alloc_sarray)
|
|
((j_common_ptr) & cinfo, JPOOL_IMAGE, row_stride, 1);
|
|
|
|
image_buffer = (JSAMPLE *) malloc(cinfo.image_width*cinfo.image_height*cinfo.output_components);
|
|
if (image_buffer == NULL) return NULL;
|
|
*width = cinfo.image_width;
|
|
*height = cinfo.image_height;
|
|
|
|
//cont = cinfo.output_height - 1;
|
|
cont = 0;
|
|
while (cinfo.output_scanline < cinfo.output_height) {
|
|
(void) jpeg_read_scanlines(&cinfo, buffer, 1);
|
|
memcpy(image_buffer + cinfo.image_width * cinfo.output_components * cont, buffer[0], row_stride);
|
|
cont++;
|
|
}
|
|
|
|
(void) jpeg_finish_decompress(&cinfo);
|
|
jpeg_destroy_decompress(&cinfo);
|
|
fclose(infile);
|
|
*components = cinfo.output_components;
|
|
return (uint8_t *)image_buffer;
|
|
}
|