(* * Hedgewars, a free turn based strategy game * Copyright (c) 2004-2015 Andrey Korotaev <unC0Rr@gmail.com> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; version 2 of the License * * This program 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 General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA *){$INCLUDE "options.inc"}unit PNGh;interfaceuses png;{$IFDEF DARWIN} {$linklib png}{$ENDIF}const // Constants for libpng, they are not defined in png unit. // We actually do not need all of them. // These describe the color_type field in png_info. // color type masks PNG_COLOR_MASK_PALETTE = 1; PNG_COLOR_MASK_COLOR = 2; PNG_COLOR_MASK_ALPHA = 4; // color types. Note that not all combinations are legal PNG_COLOR_TYPE_GRAY = 0; PNG_COLOR_TYPE_PALETTE = PNG_COLOR_MASK_COLOR or PNG_COLOR_MASK_PALETTE; PNG_COLOR_TYPE_RGB = PNG_COLOR_MASK_COLOR; PNG_COLOR_TYPE_RGB_ALPHA = PNG_COLOR_MASK_COLOR or PNG_COLOR_MASK_ALPHA; PNG_COLOR_TYPE_GRAY_ALPHA = PNG_COLOR_MASK_ALPHA; // aliases PNG_COLOR_TYPE_RGBA = PNG_COLOR_TYPE_RGB_ALPHA; PNG_COLOR_TYPE_GA = PNG_COLOR_TYPE_GRAY_ALPHA; // This is for compression type. PNG 1.0-1.2 only define the single type. PNG_COMPRESSION_TYPE_BASE = 0; // Deflate method 8, 32K window PNG_COMPRESSION_TYPE_DEFAULT = PNG_COMPRESSION_TYPE_BASE; // This is for filter type. PNG 1.0-1.2 only define the single type. PNG_FILTER_TYPE_BASE = 0; // Single row per-byte filtering PNG_INTRAPIXEL_DIFFERENCING = 64; // Used only in MNG datastreams PNG_FILTER_TYPE_DEFAULT = PNG_FILTER_TYPE_BASE; // These are for the interlacing type. These values should NOT be changed. PNG_INTERLACE_NONE = 0; // Non-interlaced image PNG_INTERLACE_ADAM7 = 1; // Adam7 interlacing PNG_INTERLACE_LAST = 2; // Not a valid valuetype // where is better place for this definition? PFile = ^file;procedure png_init_pascal_io(png_ptr: png_structp; pf : PFile);implementation// We cannot get c-style FILE* pointer to pass it to libpng, so we implement our own writing functionsprocedure PngWriteData(png_ptr: png_structp; p: PByte; len: png_size_t); cdecl;begin BlockWrite( PFile(png_get_io_ptr(png_ptr))^, p^, len);end;procedure PngFlushData(png_ptr: png_structp); cdecl;begin png_ptr:= png_ptr;end;procedure png_init_pascal_io(png_ptr: png_structp; pf : PFile);begin png_set_write_fn(png_ptr, pf, @PngWriteData, @PngFlushData);end;end.