64b4177ef4
git-svn-id: file:///fltk/svn/fltk/branches/branch-1.1@1903 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
136 lines
3.4 KiB
C++
136 lines
3.4 KiB
C++
//
|
|
// "$Id: Fl_PNG_Image.cxx,v 1.1.2.4 2002/01/01 15:11:31 easysw Exp $"
|
|
//
|
|
// Fl_PNG_Image routines.
|
|
//
|
|
// Copyright 1997-2002 by Easy Software Products.
|
|
// Image support donated by Matthias Melcher, Copyright 2000.
|
|
//
|
|
// This library is free software; you can redistribute it and/or
|
|
// modify it under the terms of the GNU Library General Public
|
|
// License as published by the Free Software Foundation; either
|
|
// version 2 of the License, or (at your option) any later version.
|
|
//
|
|
// This library 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
|
|
// Library General Public License for more details.
|
|
//
|
|
// You should have received a copy of the GNU Library General Public
|
|
// License along with this library; if not, write to the Free Software
|
|
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
|
|
// USA.
|
|
//
|
|
// Please report all bugs and problems to "fltk-bugs@fltk.org".
|
|
//
|
|
// Contents:
|
|
//
|
|
// Fl_PNG_Image::Fl_PNG_Image() - Load a PNG image file.
|
|
//
|
|
|
|
//
|
|
// Include necessary header files...
|
|
//
|
|
|
|
#include <FL/Fl_PNG_Image.H>
|
|
#include <config.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
|
|
extern "C"
|
|
{
|
|
#ifdef HAVE_LIBPNG
|
|
# include <zlib.h>
|
|
# include <png.h>
|
|
#endif // HAVE_LIBPNG
|
|
}
|
|
|
|
|
|
//
|
|
// 'Fl_PNG_Image::Fl_PNG_Image()' - Load a PNG image file.
|
|
//
|
|
|
|
Fl_PNG_Image::Fl_PNG_Image(const char *png) // I - File to read
|
|
: Fl_RGB_Image(0,0,0) {
|
|
#ifdef HAVE_LIBPNG
|
|
int i; // Looping var
|
|
FILE *fp; // File pointer
|
|
int channels; // Number of color channels
|
|
png_structp pp; // PNG read pointer
|
|
png_infop info; // PNG info pointers
|
|
png_bytep *rows; // PNG row pointers
|
|
|
|
|
|
// Open the PNG file...
|
|
if ((fp = fopen(png, "rb")) == NULL) return;
|
|
|
|
// Setup the PNG data structures...
|
|
pp = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
|
|
info = png_create_info_struct(pp);
|
|
|
|
// Initialize the PNG read "engine"...
|
|
png_init_io(pp, fp);
|
|
|
|
// Get the image dimensions and convert to grayscale or RGB...
|
|
png_read_info(pp, info);
|
|
|
|
if (info->color_type == PNG_COLOR_TYPE_PALETTE)
|
|
png_set_expand(pp);
|
|
|
|
if (info->color_type & PNG_COLOR_MASK_COLOR)
|
|
channels = 3;
|
|
else
|
|
channels = 1;
|
|
|
|
if ((info->color_type & PNG_COLOR_MASK_ALPHA) || info->num_trans)
|
|
channels ++;
|
|
|
|
w(info->width);
|
|
h(info->height);
|
|
d(channels);
|
|
|
|
if (info->bit_depth < 8)
|
|
{
|
|
png_set_packing(pp);
|
|
png_set_expand(pp);
|
|
}
|
|
else if (info->bit_depth == 16)
|
|
png_set_strip_16(pp);
|
|
|
|
#if defined(HAVE_PNG_GET_VALID) && defined(HAVE_SET_TRNS_TO_ALPHA)
|
|
// Handle transparency...
|
|
if (png_get_valid(pp, info, PNG_INFO_tRNS))
|
|
png_set_tRNS_to_alpha(pp);
|
|
#endif // HAVE_PNG_GET_VALID && HAVE_SET_TRNS_TO_ALPHA
|
|
|
|
array = new uchar[w() * h() * d()];
|
|
|
|
// Allocate pointers...
|
|
rows = new png_bytep[h()];
|
|
|
|
for (i = 0; i < h(); i ++)
|
|
rows[i] = (png_bytep)(array + i * w() * d());
|
|
|
|
// Read the image, handling interlacing as needed...
|
|
for (i = png_set_interlace_handling(pp); i > 0; i --)
|
|
png_read_rows(pp, rows, NULL, h());
|
|
|
|
// Free memory and return...
|
|
delete[] rows;
|
|
|
|
png_read_end(pp, info);
|
|
# ifdef HAVE_PNG_READ_DESTROY
|
|
png_read_destroy(pp, info, NULL);
|
|
# else
|
|
png_destroy_read_struct(&pp, &info, NULL);
|
|
# endif // HAVE_PNG_READ_DESTROY
|
|
|
|
fclose(fp);
|
|
#endif // HAVE_LIBPNG
|
|
}
|
|
|
|
|
|
//
|
|
// End of "$Id: Fl_PNG_Image.cxx,v 1.1.2.4 2002/01/01 15:11:31 easysw Exp $".
|
|
//
|