hedgewars/uChat.pas
author unc0rr
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(*
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 * Hedgewars, a worms-like game
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 * Copyright (c) 2008 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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 *)
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unit uChat;
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interface
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procedure AddChatString(s: shortstring);
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procedure DrawChat;
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procedure KeyPressChat(Key: Longword);
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implementation
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uses uMisc, uStore, uConsts, SDLh;
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const MaxStrIndex = 7;
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type TChatLine = record
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		s: shortstring;
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		Time: Longword;
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		Tex: PTexture;
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		end;
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var Strs: array[0 .. MaxStrIndex] of TChatLine;
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	lastStr: Longword = 0;
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	visibleCount: Longword = 0;
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	InputStr: TChatLine;
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	InputStrL: array[0..260] of char; // for full str + 4-byte utf-8 char
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procedure SetLine(var cl: TChatLine; str: shortstring);
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var strSurface, resSurface: PSDL_Surface;
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    r: TSDL_Rect;
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    w, h: LongInt;
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begin
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if cl.Tex <> nil then
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	FreeTexture(cl.Tex);
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TTF_SizeUTF8(Fontz[fnt16].Handle, Str2PChar(str), w, h);
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resSurface:= SDL_CreateRGBSurface(0,
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		toPowerOf2(w + 2),
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		toPowerOf2(h + 2),
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		32,
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		RMask, GMask, BMask, AMask);
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strSurface:= TTF_RenderUTF8_Solid(Fontz[fnt16].Handle, Str2PChar(str), $202020);
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r.x:= 1;
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r.y:= 1;
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SDL_UpperBlit(strSurface, nil, resSurface, @r);
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strSurface:= TTF_RenderUTF8_Solid(Fontz[fnt16].Handle, Str2PChar(str), $FFFFFF);
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SDL_UpperBlit(strSurface, nil, resSurface, nil);
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SDL_FreeSurface(strSurface);
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cl.Time:= RealTicks + 7500;
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cl.Tex:= Surface2Tex(resSurface);
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SDL_FreeSurface(resSurface)
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end;
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procedure AddChatString(s: shortstring);
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begin
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lastStr:= (lastStr + 1) mod (MaxStrIndex + 1);
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SetLine(Strs[lastStr], s);
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inc(visibleCount)
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end;
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procedure DrawChat;
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var i, t, cnt: Longword;
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begin
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cnt:= 0;
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t:= 0;
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i:= lastStr;
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while (t <= MaxStrIndex)
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	and (Strs[i].Tex <> nil)
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	and (Strs[i].Time > RealTicks) do
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	begin
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	DrawTexture(8, (visibleCount - t) * 16 - 6 + cConsoleYAdd, Strs[i].Tex);
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	if i = 0 then i:= MaxStrIndex else dec(i);
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	inc(cnt);
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	inc(t)
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	end;
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visibleCount:= cnt
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end;
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procedure KeyPressChat(Key: Longword);
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const firstByteMark: array[1..4] of byte = (0, $C0, $E0, $F0);
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var i, btw: integer;
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    utf8: shortstring;
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begin
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if Key <> 0 then
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	case Key of
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		8: if Length(InputStr.s) > 0 then
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				begin
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				InputStr.s[0]:= InputStrL[byte(InputStr.s[0])];
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				SetLine(InputStr, InputStr.s)
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				end;
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		13,271: begin
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			AddChatString(InputStr.s);
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			SetLine(InputStr, '');
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			GameState:= gsGame
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			end
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	else
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	if (Key < $80) then btw:= 1
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	else if (Key < $800) then btw:= 2
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	else if (Key < $10000) then btw:= 3
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	else btw:= 4;
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	utf8:= '';
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	for i:= btw downto 2 do
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		begin
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		utf8:= char((Key or $80) and $BF) + utf8;
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		Key:= Key shr 6
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		end;
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	utf8:= char(Key or firstByteMark[btw]) + utf8;
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	InputStrL[byte(InputStr.s[0]) + btw]:= InputStr.s[0];
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	SetLine(InputStr, InputStr.s + utf8)
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	end
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end;
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end.