hedgewars/PNGh.pas
author sheepluva
Tue, 15 May 2018 23:47:07 +0200
branchui-scaling
changeset 13387 706b34d0ce60
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(*
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 * Hedgewars, a free turn based strategy game
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 * Copyright (c) 2004-2015 Andrey Korotaev <unC0Rr@gmail.com>
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 *
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 * This program is free software; you can redistribute it and/or modify
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 * it under the terms of the GNU General Public License as published by
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 * the Free Software Foundation; version 2 of the License
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 *
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 * This program 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
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 * GNU General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public License
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 * along with this program; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
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 *)
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{$INCLUDE "options.inc"}
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unit PNGh;
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interface
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uses png;
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{$IFDEF DARWIN}
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    {$linklib png}
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{$ENDIF}
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const
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    // Constants for libpng, they are not defined in png unit.
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    // We actually do not need all of them.
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    // These describe the color_type field in png_info.
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    // color type masks
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    PNG_COLOR_MASK_PALETTE = 1;
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    PNG_COLOR_MASK_COLOR   = 2;
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    PNG_COLOR_MASK_ALPHA   = 4;
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    // color types.  Note that not all combinations are legal
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    PNG_COLOR_TYPE_GRAY       = 0;
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    PNG_COLOR_TYPE_PALETTE    = PNG_COLOR_MASK_COLOR or PNG_COLOR_MASK_PALETTE;
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    PNG_COLOR_TYPE_RGB        = PNG_COLOR_MASK_COLOR;
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    PNG_COLOR_TYPE_RGB_ALPHA  = PNG_COLOR_MASK_COLOR or PNG_COLOR_MASK_ALPHA;
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    PNG_COLOR_TYPE_GRAY_ALPHA = PNG_COLOR_MASK_ALPHA;
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    // aliases
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    PNG_COLOR_TYPE_RGBA = PNG_COLOR_TYPE_RGB_ALPHA;
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    PNG_COLOR_TYPE_GA   = PNG_COLOR_TYPE_GRAY_ALPHA;
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    // This is for compression type. PNG 1.0-1.2 only define the single type.
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    PNG_COMPRESSION_TYPE_BASE    = 0; // Deflate method 8, 32K window
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    PNG_COMPRESSION_TYPE_DEFAULT = PNG_COMPRESSION_TYPE_BASE;
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    // This is for filter type. PNG 1.0-1.2 only define the single type.
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    PNG_FILTER_TYPE_BASE        = 0;  // Single row per-byte filtering
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    PNG_INTRAPIXEL_DIFFERENCING = 64; // Used only in MNG datastreams
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    PNG_FILTER_TYPE_DEFAULT     = PNG_FILTER_TYPE_BASE;
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    // These are for the interlacing type.  These values should NOT be changed.
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    PNG_INTERLACE_NONE  = 0; // Non-interlaced image
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    PNG_INTERLACE_ADAM7 = 1; // Adam7 interlacing
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    PNG_INTERLACE_LAST  = 2; // Not a valid value
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type
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    // where is better place for this definition?
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    PFile = ^file;
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procedure png_init_pascal_io(png_ptr: png_structp; pf : PFile);
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implementation
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// We cannot get c-style FILE* pointer to pass it to libpng, so we implement our own writing functions
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procedure PngWriteData(png_ptr: png_structp; p: PByte; len: png_size_t); cdecl;
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begin
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    BlockWrite( PFile(png_get_io_ptr(png_ptr))^, p^, len);
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end;
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procedure PngFlushData(png_ptr: png_structp); cdecl;
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begin
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    png_ptr:= png_ptr;
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end;
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procedure png_init_pascal_io(png_ptr: png_structp; pf : PFile);
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begin
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    png_set_write_fn(png_ptr, pf, @PngWriteData, @PngFlushData);
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end;
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end.