(*
    Copyright 2021-2023 Anton Krotov

    This file is part of CEdit.

    CEdit 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, either version 3 of the License, or
    (at your option) any later version.

    CEdit 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 CEdit. If not, see <http://www.gnu.org/licenses/>.
*)

MODULE Icons;

IMPORT
	Graph, File, SYSTEM, KOSAPI;

CONST
	fileName = "/sys/Icons16.png";
	SIZE* = 18;

	icoNew    *=  0;
	icoOpen   *=  1;
	icoSave   *=  2;
	icoSearch *=  3;
	icoUndo   *=  4;
	icoRedo   *=  5;
	icoBuild  *=  6;
	icoRun    *=  7;

	NumberOfIcons = 8;


PROCEDURE [stdcall, "libimg.obj", ""] img_decode (data, size, options: INTEGER): INTEGER; END;
PROCEDURE [stdcall, "Libimg.obj", ""] img_convert (src, dst, dst_type, flags, param: INTEGER): INTEGER; END;
PROCEDURE [stdcall, "Libimg.obj", ""] img_destroy (img: INTEGER); END;


PROCEDURE GetImg (ptr, size: INTEGER): INTEGER;
VAR
	image_data, dst, x, Type: INTEGER;
BEGIN
	image_data := img_decode(ptr, size, 0);
	IF image_data # 0 THEN
		SYSTEM.GET(image_data + 4, x);
		ASSERT(x = SIZE);
		SYSTEM.GET(image_data + 20, Type);
		IF Type # 3 THEN
			dst := img_convert(image_data, 0, 3, 0, 0);
			img_destroy(image_data);
			image_data := dst
		END
	END
	RETURN image_data
END GetImg;


PROCEDURE load (): INTEGER;
VAR
	size, res, ptr: INTEGER;
BEGIN
	res := 0;
	ptr := File.Load(fileName, size);
	IF ptr # 0 THEN
		res := GetImg(ptr, size);
		ptr := KOSAPI.free(ptr)
	END
	RETURN res
END load;


PROCEDURE draw* (icons, n, x, y: INTEGER);
BEGIN
	KOSAPI.sysfunc7(65, icons + SIZE*SIZE*4*n, SIZE*65536 + SIZE, x*65536 + y, 32, 0, 0)
END draw;


PROCEDURE copy (img: INTEGER; n: INTEGER; dst: INTEGER; m: INTEGER);
VAR
	data: INTEGER;
BEGIN
	SYSTEM.GET(img + 24, data);
	SYSTEM.MOVE(data + SIZE*SIZE*4*n, dst + SIZE*SIZE*4*m, SIZE*SIZE*4)
END copy;


PROCEDURE iconsBackColor (icons: INTEGER; BackColor: INTEGER);
VAR
	data, x, y, pix: INTEGER;
	b, g, r, gr: BYTE;
BEGIN
	data := icons;
	FOR y := 0 TO SIZE*NumberOfIcons - 1 DO
		FOR x := 0 TO SIZE - 1 DO
			SYSTEM.GET32(data, pix);
			Graph.getRGB(pix, r, g, b);
			gr := (r + g + b) DIV 3;
			IF BackColor = -1 THEN
				pix := gr + 256*gr + 65536*gr
			ELSIF gr = 255 THEN
				pix := BackColor
			END;
			SYSTEM.PUT32(data, pix);
			INC(data, 4)
		END
	END
END iconsBackColor;


PROCEDURE get* (VAR icons, grayIcons: INTEGER; BackColor: INTEGER);
VAR
	source: INTEGER;
BEGIN
	source := load();
	IF source # 0 THEN
		icons := KOSAPI.malloc(SIZE*SIZE*4*NumberOfIcons*2);
		grayIcons := icons + SIZE*SIZE*4*NumberOfIcons;

		copy(source,  2, icons, icoNew);
		copy(source,  0, icons, icoOpen);
		copy(source,  5, icons, icoSave);
		copy(source, 49, icons, icoSearch);
		copy(source, 37, icons, icoUndo);
		copy(source, 36, icons, icoRedo);
		copy(source, 54, icons, icoBuild);
		copy(source, 53, icons, icoRun);
		img_destroy(source);
		source := 0;
		SYSTEM.MOVE(icons, grayIcons, SIZE*SIZE*4*NumberOfIcons);

		iconsBackColor(grayIcons, -1);
		iconsBackColor(grayIcons, BackColor);
		iconsBackColor(icons, BackColor)
	END
END get;

END Icons.