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Diffstat (limited to 'src/Fl_PNG_Image.cxx')
| -rw-r--r-- | src/Fl_PNG_Image.cxx | 146 |
1 files changed, 146 insertions, 0 deletions
diff --git a/src/Fl_PNG_Image.cxx b/src/Fl_PNG_Image.cxx new file mode 100644 index 000000000..36ede18ff --- /dev/null +++ b/src/Fl_PNG_Image.cxx @@ -0,0 +1,146 @@ +// +// "$Id: Fl_PNG_Image.cxx,v 1.1.2.1 2001/11/19 01:06:45 easysw Exp $" +// +// Fl_PNG_Image routines. +// +// Copyright 1997-2001 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: +// +// + +// +// Include necessary header files... +// + +#include <FL/Fl_PNG_Image.H> +#include "config.h" +#include <stdio.h> +#include <stdlib.h> +#include <ctype.h> +#include <string.h> +#ifdef HAVE_STRINGS_H +# include <strings.h> +#endif /* HAVE_STRINGS_H */ +#include <errno.h> + +extern "C" +{ +#ifdef HAVE_LIBPNG +# include <zlib.h> +# include <png.h> +#endif // HAVE_LIBPNG +} + + +#if 0 +#ifdef HAVE_LIBPNG +// +// 'Fl_Help_View::load_png()' - Load a PNG image file. +// + +int // O - 0 = success, -1 = fail +Fl_Help_View::load_png(Fl_Help_Image *img,// I - Image pointer + FILE *fp) // I - File to read from +{ + int i; // Looping var + png_structp pp; // PNG read pointer + png_infop info; // PNG info pointers + png_bytep *rows; // PNG row pointers + png_color_16 bg; // Background color + + + // 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) + img->d = 3; + else + img->d = 1; + + if ((info->color_type & PNG_COLOR_MASK_ALPHA) || info->num_trans) + img->d ++; + + 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 + + img->w = (int)info->width; + img->h = (int)info->height; + img->data = (unsigned char *)malloc(img->w * img->h * img->d); + + // Background color... + unsigned rgba = fltk_colors[bgcolor_]; + + bg.red = 65535 * (rgba >> 24) / 255; + bg.green = 65535 * ((rgba >> 16) & 255) / 255; + bg.blue = 65535 * ((rgba >> 8) & 255) / 255; + + png_set_background(pp, &bg, PNG_BACKGROUND_GAMMA_SCREEN, 0, 1.0); + + // Allocate pointers... + rows = (png_bytep *)calloc(info->height, sizeof(png_bytep)); + + for (i = 0; i < (int)info->height; i ++) + rows[i] = img->data + i * img->w * img->d; + + // Read the image, handling interlacing as needed... + for (i = png_set_interlace_handling(pp); i > 0; i --) + png_read_rows(pp, rows, NULL, img->h); + + // Free memory and return... + free(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 + + return (1); +} +#endif // HAVE_LIBPNG +#endif // 0 + +// +// End of "$Id: Fl_PNG_Image.cxx,v 1.1.2.1 2001/11/19 01:06:45 easysw Exp $". +// |