ref: e447c9fb929e61a40203b0193ee8d4cab8d72f7e
dir: /DoConfig/fltk/src/Fl_JPEG_Image.cxx/
//
// "$Id$"
//
// Fl_JPEG_Image routines.
//
// Copyright 1997-2011 by Easy Software Products.
// Image support by Matthias Melcher, Copyright 2000-2009.
//
// This library is free software. Distribution and use rights are outlined in
// the file "COPYING" which should have been included with this file. If this
// file is missing or damaged, see the license at:
//
// http://www.fltk.org/COPYING.php
//
// Please report all bugs and problems on the following page:
//
// http://www.fltk.org/str.php
//
// Contents:
//
// Fl_JPEG_Image::Fl_JPEG_Image() - Load a JPEG image file.
//
//
// Include necessary header files...
//
#include <FL/Fl_JPEG_Image.H>
#include <FL/Fl_Shared_Image.H>
#include <FL/fl_utf8.h>
#include <FL/Fl.H>
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <setjmp.h>
// Some releases of the Cygwin JPEG libraries don't have a correctly
// updated header file for the INT32 data type; the following define
// from Shane Hill seems to be a usable workaround...
#if defined(WIN32) && defined(__CYGWIN__)
# define XMD_H
#endif // WIN32 && __CYGWIN__
extern "C"
{
#ifdef HAVE_LIBJPEG
# include <jpeglib.h>
#endif // HAVE_LIBJPEG
}
//
// Custom JPEG error handling structure...
//
#ifdef HAVE_LIBJPEG
struct fl_jpeg_error_mgr {
jpeg_error_mgr pub_; // Destination manager...
jmp_buf errhand_; // Error handler
};
#endif // HAVE_LIBJPEG
//
// Error handler for JPEG files...
//
#ifdef HAVE_LIBJPEG
extern "C" {
static void
fl_jpeg_error_handler(j_common_ptr dinfo) { // I - Decompressor info
longjmp(((fl_jpeg_error_mgr *)(dinfo->err))->errhand_, 1);
}
static void
fl_jpeg_output_handler(j_common_ptr) { // I - Decompressor info (not used)
}
}
#endif // HAVE_LIBJPEG
/**
\brief The constructor loads the JPEG image from the given jpeg filename.
The inherited destructor frees all memory and server resources that are used
by the image.
Use Fl_Image::fail() to check if Fl_JPEG_Image failed to load. fail() returns
ERR_FILE_ACCESS if the file could not be opened or read, ERR_FORMAT if the
JPEG format could not be decoded, and ERR_NO_IMAGE if the image could not
be loaded for another reason. If the image has loaded correctly,
w(), h(), and d() should return values greater than zero.
\param[in] filename a full path and name pointing to a valid jpeg file.
*/
Fl_JPEG_Image::Fl_JPEG_Image(const char *filename) // I - File to load
: Fl_RGB_Image(0,0,0) {
#ifdef HAVE_LIBJPEG
FILE *fp; // File pointer
jpeg_decompress_struct dinfo; // Decompressor info
fl_jpeg_error_mgr jerr; // Error handler info
JSAMPROW row; // Sample row pointer
// the following variables are pointers allocating some private space that
// is not reset by 'setjmp()'
char* max_finish_decompress_err; // count errors and give up afer a while
char* max_destroy_decompress_err; // to avoid recusion and deadlock
// Clear data...
alloc_array = 0;
array = (uchar *)0;
// Open the image file...
if ((fp = fl_fopen(filename, "rb")) == NULL) {
ld(ERR_FILE_ACCESS);
return;
}
// Setup the decompressor info and read the header...
dinfo.err = jpeg_std_error((jpeg_error_mgr *)&jerr);
jerr.pub_.error_exit = fl_jpeg_error_handler;
jerr.pub_.output_message = fl_jpeg_output_handler;
// Setup error loop variables
max_finish_decompress_err = (char*)malloc(1); // allocate space on the frame for error counters
max_destroy_decompress_err = (char*)malloc(1); // otherwise, the variables are reset on the longjmp
*max_finish_decompress_err=10;
*max_destroy_decompress_err=10;
if (setjmp(jerr.errhand_))
{
// JPEG error handling...
Fl::warning("JPEG file \"%s\" is too large or contains errors!\n", filename);
// if any of the cleanup routines hits another error, we would end up
// in a loop. So instead, we decrement max_err for some upper cleanup limit.
if ( ((*max_finish_decompress_err)-- > 0) && array)
jpeg_finish_decompress(&dinfo);
if ( (*max_destroy_decompress_err)-- > 0)
jpeg_destroy_decompress(&dinfo);
fclose(fp);
w(0);
h(0);
d(0);
if (array) {
delete[] (uchar *)array;
array = 0;
alloc_array = 0;
}
free(max_destroy_decompress_err);
free(max_finish_decompress_err);
ld(ERR_FORMAT);
return;
}
jpeg_create_decompress(&dinfo);
jpeg_stdio_src(&dinfo, fp);
jpeg_read_header(&dinfo, TRUE);
dinfo.quantize_colors = (boolean)FALSE;
dinfo.out_color_space = JCS_RGB;
dinfo.out_color_components = 3;
dinfo.output_components = 3;
jpeg_calc_output_dimensions(&dinfo);
w(dinfo.output_width);
h(dinfo.output_height);
d(dinfo.output_components);
if (((size_t)w()) * h() * d() > max_size() ) longjmp(jerr.errhand_, 1);
array = new uchar[w() * h() * d()];
alloc_array = 1;
jpeg_start_decompress(&dinfo);
while (dinfo.output_scanline < dinfo.output_height) {
row = (JSAMPROW)(array +
dinfo.output_scanline * dinfo.output_width *
dinfo.output_components);
jpeg_read_scanlines(&dinfo, &row, (JDIMENSION)1);
}
jpeg_finish_decompress(&dinfo);
jpeg_destroy_decompress(&dinfo);
free(max_destroy_decompress_err);
free(max_finish_decompress_err);
fclose(fp);
#endif // HAVE_LIBJPEG
}
// data source manager for reading jpegs from memory
// init_source (j_decompress_ptr cinfo)
// fill_input_buffer (j_decompress_ptr cinfo)
// skip_input_data (j_decompress_ptr cinfo, long num_bytes)
// resync_to_restart (j_decompress_ptr cinfo, int desired)
// term_source (j_decompress_ptr cinfo)
// JOCTET * next_output_byte; /* => next byte to write in buffer */
// size_t free_in_buffer; /* # of byte spaces remaining in buffer */
#ifdef HAVE_LIBJPEG
typedef struct {
struct jpeg_source_mgr pub;
const unsigned char *data, *s;
// JOCTET * buffer; /* start of buffer */
// boolean start_of_file; /* have we gotten any data yet? */
} my_source_mgr;
typedef my_source_mgr *my_src_ptr;
extern "C" {
static void init_source(j_decompress_ptr cinfo) {
my_src_ptr src = (my_src_ptr)cinfo->src;
src->s = src->data;
}
static boolean fill_input_buffer(j_decompress_ptr cinfo) {
my_src_ptr src = (my_src_ptr)cinfo->src;
size_t nbytes = 4096;
src->pub.next_input_byte = src->s;
src->pub.bytes_in_buffer = nbytes;
src->s += nbytes;
return TRUE;
}
static void term_source(j_decompress_ptr cinfo)
{
}
static void skip_input_data(j_decompress_ptr cinfo, long num_bytes) {
my_src_ptr src = (my_src_ptr)cinfo->src;
if (num_bytes > 0) {
while (num_bytes > (long)src->pub.bytes_in_buffer) {
num_bytes -= (long)src->pub.bytes_in_buffer;
fill_input_buffer(cinfo);
}
src->pub.next_input_byte += (size_t) num_bytes;
src->pub.bytes_in_buffer -= (size_t) num_bytes;
}
}
} // extern "C"
static void jpeg_mem_src(j_decompress_ptr cinfo, const unsigned char *data)
{
my_src_ptr src;
cinfo->src = (struct jpeg_source_mgr *)malloc(sizeof(my_source_mgr));
src = (my_src_ptr)cinfo->src;
src->pub.init_source = init_source;
src->pub.fill_input_buffer = fill_input_buffer;
src->pub.skip_input_data = skip_input_data;
src->pub.resync_to_restart = jpeg_resync_to_restart;
src->pub.term_source = term_source;
src->pub.bytes_in_buffer = 0; /* forces fill_input_buffer on first read */
src->pub.next_input_byte = NULL; /* until buffer loaded */
src->data = data;
src->s = data;
}
#endif // HAVE_LIBJPEG
/**
\brief The constructor loads the JPEG image from memory.
Construct an image from a block of memory inside the application. Fluid offers
"binary Data" chunks as a great way to add image data into the C++ source code.
name_png can be NULL. If a name is given, the image is added to the list of
shared images (see: Fl_Shared_Image) and will be available by that name.
The inherited destructor frees all memory and server resources that are used
by the image.
Use Fl_Image::fail() to check if Fl_JPEG_Image failed to load. fail() returns
ERR_FILE_ACCESS if the file could not be opened or read, ERR_FORMAT if the
JPEG format could not be decoded, and ERR_NO_IMAGE if the image could not
be loaded for another reason. If the image has loaded correctly,
w(), h(), and d() should return values greater than zero.
\param name A unique name or NULL
\param data A pointer to the memory location of the JPEG image
*/
Fl_JPEG_Image::Fl_JPEG_Image(const char *name, const unsigned char *data)
: Fl_RGB_Image(0,0,0) {
#ifdef HAVE_LIBJPEG
jpeg_decompress_struct dinfo; // Decompressor info
fl_jpeg_error_mgr jerr; // Error handler info
JSAMPROW row; // Sample row pointer
// the following variables are pointers allocating some private space that
// is not reset by 'setjmp()'
char* max_finish_decompress_err; // count errors and give up afer a while
char* max_destroy_decompress_err; // to avoid recusion and deadlock
// Clear data...
alloc_array = 0;
array = (uchar *)0;
// Setup the decompressor info and read the header...
dinfo.err = jpeg_std_error((jpeg_error_mgr *)&jerr);
jerr.pub_.error_exit = fl_jpeg_error_handler;
jerr.pub_.output_message = fl_jpeg_output_handler;
// Setup error loop variables
max_finish_decompress_err = (char*)malloc(1); // allocate space on the frame for error counters
max_destroy_decompress_err = (char*)malloc(1); // otherwise, the variables are reset on the longjmp
*max_finish_decompress_err=10;
*max_destroy_decompress_err=10;
if (setjmp(jerr.errhand_))
{
// JPEG error handling...
Fl::warning("JPEG data is too large or contains errors!\n");
// if any of the cleanup routines hits another error, we would end up
// in a loop. So instead, we decrement max_err for some upper cleanup limit.
if ( ((*max_finish_decompress_err)-- > 0) && array)
jpeg_finish_decompress(&dinfo);
if ( (*max_destroy_decompress_err)-- > 0)
jpeg_destroy_decompress(&dinfo);
w(0);
h(0);
d(0);
if (array) {
delete[] (uchar *)array;
array = 0;
alloc_array = 0;
}
free(max_destroy_decompress_err);
free(max_finish_decompress_err);
return;
}
jpeg_create_decompress(&dinfo);
jpeg_mem_src(&dinfo, data);
jpeg_read_header(&dinfo, TRUE);
dinfo.quantize_colors = (boolean)FALSE;
dinfo.out_color_space = JCS_RGB;
dinfo.out_color_components = 3;
dinfo.output_components = 3;
jpeg_calc_output_dimensions(&dinfo);
w(dinfo.output_width);
h(dinfo.output_height);
d(dinfo.output_components);
if (((size_t)w()) * h() * d() > max_size() ) longjmp(jerr.errhand_, 1);
array = new uchar[w() * h() * d()];
alloc_array = 1;
jpeg_start_decompress(&dinfo);
while (dinfo.output_scanline < dinfo.output_height) {
row = (JSAMPROW)(array +
dinfo.output_scanline * dinfo.output_width *
dinfo.output_components);
jpeg_read_scanlines(&dinfo, &row, (JDIMENSION)1);
}
jpeg_finish_decompress(&dinfo);
jpeg_destroy_decompress(&dinfo);
free(max_destroy_decompress_err);
free(max_finish_decompress_err);
if (w() && h() && name) {
Fl_Shared_Image *si = new Fl_Shared_Image(name, this);
si->add();
}
#endif // HAVE_LIBJPEG
}
//
// End of "$Id$".
//