5251b64d57
git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3@6616 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
159 lines
4.0 KiB
C++
159 lines
4.0 KiB
C++
//
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// "$Id$"
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//
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// Fl_PNG_Image routines.
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//
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// Copyright 1997-2009 by Easy Software Products.
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// Image support by Matthias Melcher, Copyright 2000-2009.
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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_PNG_Image::Fl_PNG_Image() - Load a PNG 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.H>
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#include <FL/Fl_PNG_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 <FL/fl_utf8.h>
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extern "C"
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{
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#if defined(HAVE_LIBPNG) && defined(HAVE_LIBZ)
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# include <zlib.h>
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# ifdef HAVE_PNG_H
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# include <png.h>
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# else
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# include <libpng/png.h>
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# endif // HAVE_PNG_H
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#endif // HAVE_LIBPNG && HAVE_LIBZ
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}
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/**
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The constructor loads the named PNG image from the given png filename.
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<P>The destructor free all memory and server resources that are used by
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the image.
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*/
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Fl_PNG_Image::Fl_PNG_Image(const char *png) // I - File to read
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: Fl_RGB_Image(0,0,0) {
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#if defined(HAVE_LIBPNG) && defined(HAVE_LIBZ)
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int i; // Looping var
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FILE *fp; // File pointer
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int channels; // Number of color channels
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png_structp pp; // PNG read pointer
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png_infop info; // PNG info pointers
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png_bytep *rows; // PNG row pointers
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// Open the PNG file...
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if ((fp = fl_fopen(png, "rb")) == NULL) return;
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// Setup the PNG data structures...
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pp = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
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info = png_create_info_struct(pp);
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if (setjmp(pp->jmpbuf))
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{
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Fl::warning("PNG file \"%s\" contains errors!\n", png);
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return;
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}
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// Initialize the PNG read "engine"...
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png_init_io(pp, fp);
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// Get the image dimensions and convert to grayscale or RGB...
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png_read_info(pp, info);
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if (info->color_type == PNG_COLOR_TYPE_PALETTE)
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png_set_expand(pp);
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if (info->color_type & PNG_COLOR_MASK_COLOR)
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channels = 3;
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else
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channels = 1;
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if ((info->color_type & PNG_COLOR_MASK_ALPHA) || info->num_trans)
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channels ++;
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w((int)(info->width));
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h((int)(info->height));
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d(channels);
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if (info->bit_depth < 8)
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{
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png_set_packing(pp);
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png_set_expand(pp);
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}
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else if (info->bit_depth == 16)
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png_set_strip_16(pp);
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# if defined(HAVE_PNG_GET_VALID) && defined(HAVE_PNG_SET_TRNS_TO_ALPHA)
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// Handle transparency...
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if (png_get_valid(pp, info, PNG_INFO_tRNS))
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png_set_tRNS_to_alpha(pp);
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# endif // HAVE_PNG_GET_VALID && HAVE_PNG_SET_TRNS_TO_ALPHA
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array = new uchar[w() * h() * d()];
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alloc_array = 1;
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// Allocate pointers...
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rows = new png_bytep[h()];
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for (i = 0; i < h(); i ++)
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rows[i] = (png_bytep)(array + i * w() * d());
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// Read the image, handling interlacing as needed...
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for (i = png_set_interlace_handling(pp); i > 0; i --)
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png_read_rows(pp, rows, NULL, h());
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#ifdef WIN32
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// Some Windows graphics drivers don't honor transparency when RGB == white
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if (channels == 4) {
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// Convert RGB to 0 when alpha == 0...
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uchar *ptr = (uchar *)array;
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for (i = w() * h(); i > 0; i --, ptr += 4)
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if (!ptr[3]) ptr[0] = ptr[1] = ptr[2] = 0;
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}
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#endif // WIN32
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// Free memory and return...
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delete[] rows;
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png_read_end(pp, info);
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png_destroy_read_struct(&pp, &info, NULL);
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fclose(fp);
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#endif // HAVE_LIBPNG && HAVE_LIBZ
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}
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//
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// End of "$Id$".
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//
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