1c399af444
git-svn-id: file:///fltk/svn/fltk/branches/branch-1.1@4288 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
176 lines
4.0 KiB
C++
176 lines
4.0 KiB
C++
//
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// "$Id$"
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//
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// Fl_JPEG_Image routines.
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//
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// Copyright 1997-2005 by Easy Software Products.
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// Image support donated by Matthias Melcher, Copyright 2000.
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Library General Public
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// License as published by the Free Software Foundation; either
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// version 2 of the License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Library General Public License for more details.
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//
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// You should have received a copy of the GNU Library General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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// USA.
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//
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// Please report all bugs and problems on the following page:
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//
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// http://www.fltk.org/str.php
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//
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// Contents:
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//
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// Fl_JPEG_Image::Fl_JPEG_Image() - Load a JPEG image file.
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//
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//
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// Include necessary header files...
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//
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#include <FL/Fl_JPEG_Image.H>
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#include <config.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <setjmp.h>
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// Some releases of the Cygwin JPEG libraries don't have a correctly
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// updated header file for the INT32 data type; the following define
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// from Shane Hill seems to be a usable workaround...
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#if defined(WIN32) && defined(__CYGWIN__)
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# define XMD_H
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#endif // WIN32 && __CYGWIN__
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extern "C"
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{
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#ifdef HAVE_LIBJPEG
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# include <jpeglib.h>
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#endif // HAVE_LIBJPEG
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}
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//
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// Custom JPEG error handling structure...
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//
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#ifdef HAVE_LIBJPEG
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struct fl_jpeg_error_mgr {
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jpeg_error_mgr pub_; // Destination manager...
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jmp_buf errhand_; // Error handler
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};
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#endif // HAVE_LIBJPEG
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//
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// Error handler for JPEG files...
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//
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#ifdef HAVE_LIBJPEG
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extern "C" {
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static void
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fl_jpeg_error_handler(j_common_ptr dinfo) { // I - Decompressor info
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longjmp(((fl_jpeg_error_mgr *)(dinfo->err))->errhand_, 1);
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return;
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}
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static void
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fl_jpeg_output_handler(j_common_ptr dinfo) { // I - Decompressor info
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return;
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}
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}
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#endif // HAVE_LIBJPEG
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//
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// 'Fl_JPEG_Image::Fl_JPEG_Image()' - Load a JPEG image file.
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//
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Fl_JPEG_Image::Fl_JPEG_Image(const char *jpeg) // I - File to load
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: Fl_RGB_Image(0,0,0) {
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#ifdef HAVE_LIBJPEG
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FILE *fp; // File pointer
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jpeg_decompress_struct dinfo; // Decompressor info
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fl_jpeg_error_mgr jerr; // Error handler info
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JSAMPROW row; // Sample row pointer
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// Clear data...
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alloc_array = 0;
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array = (uchar *)0;
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// Open the image file...
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if ((fp = fopen(jpeg, "rb")) == NULL) return;
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// Setup the decompressor info and read the header...
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dinfo.err = jpeg_std_error((jpeg_error_mgr *)&jerr);
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jerr.pub_.error_exit = fl_jpeg_error_handler;
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jerr.pub_.output_message = fl_jpeg_output_handler;
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if (setjmp(jerr.errhand_))
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{
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// JPEG error handling...
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if (array) jpeg_finish_decompress(&dinfo);
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jpeg_destroy_decompress(&dinfo);
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fclose(fp);
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w(0);
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h(0);
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d(0);
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if (array) {
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delete[] (uchar *)array;
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array = 0;
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alloc_array = 0;
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}
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return;
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}
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jpeg_create_decompress(&dinfo);
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jpeg_stdio_src(&dinfo, fp);
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jpeg_read_header(&dinfo, 1);
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dinfo.quantize_colors = (boolean)FALSE;
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dinfo.out_color_space = JCS_RGB;
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dinfo.out_color_components = 3;
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dinfo.output_components = 3;
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jpeg_calc_output_dimensions(&dinfo);
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w(dinfo.output_width);
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h(dinfo.output_height);
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d(dinfo.output_components);
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array = new uchar[w() * h() * d()];
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alloc_array = 1;
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jpeg_start_decompress(&dinfo);
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while (dinfo.output_scanline < dinfo.output_height) {
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row = (JSAMPROW)(array +
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dinfo.output_scanline * dinfo.output_width *
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dinfo.output_components);
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jpeg_read_scanlines(&dinfo, &row, (JDIMENSION)1);
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}
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jpeg_finish_decompress(&dinfo);
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jpeg_destroy_decompress(&dinfo);
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fclose(fp);
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#endif // HAVE_LIBJPEG
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}
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//
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// End of "$Id$".
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//
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