Remove loc() called with a variable.
(*
* Hedgewars, a free turn based strategy game
* Copyright (c) 2004-2014 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
*)
{$INCLUDE "options.inc"}
unit PNGh;
interface
uses png;
{$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 value
type
// 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 functions
procedure 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
end;
procedure png_init_pascal_io(png_ptr: png_structp; pf : PFile);
begin
png_set_write_fn(png_ptr, pf, @PngWriteData, @PngFlushData);
end;
end.