forked from KolibriOS/kolibrios
125 lines
3.6 KiB
Plaintext
125 lines
3.6 KiB
Plaintext
(*
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Copyright 2016, 2018 KolibriOS team
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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 Lesser General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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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 Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*)
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MODULE RasterWorks;
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IMPORT sys := SYSTEM, KOSAPI;
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CONST
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(* flags *)
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bold *= 1;
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italic *= 2;
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underline *= 4;
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strike_through *= 8;
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align_right *= 16;
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align_center *= 32;
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bpp32 *= 128;
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(* encoding *)
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cp866 *= 1;
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utf16le *= 2;
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utf8 *= 3;
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VAR
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// draw text on 24bpp or 32bpp image
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// autofits text between 'x' and 'xSize'
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drawText *: PROCEDURE (canvas, x, y, string, charQuantity, fontColor, params: INTEGER): INTEGER;
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(*
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[canvas]:
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xSize dd ?
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ySize dd ?
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picture rb xSize * ySize * bpp
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fontColor dd AARRGGBB
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AA = alpha channel ; 0 = transparent, FF = non transparent
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params dd ffeewwhh
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hh = char height
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ww = char width ; 0 = auto (proportional)
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ee = encoding ; 1 = cp866, 2 = UTF-16LE, 3 = UTF-8
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ff = flags ; 0001 = bold, 0010 = italic
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; 0100 = underline, 1000 = strike-through
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00010000 = align right, 00100000 = align center
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01000000 = set text area between higher and lower halfs of 'x'
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10000000 = 32bpp canvas insted of 24bpp
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all flags combinable, except align right + align center
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returns: char width (0 = error)
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*)
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// calculate amount of valid chars in UTF-8 string
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// supports zero terminated string (set byteQuantity = -1)
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cntUTF_8 *: PROCEDURE (string, byteQuantity: INTEGER): INTEGER;
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// calculate amount of chars that fits given width
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charsFit *: PROCEDURE (areaWidth, charHeight: INTEGER): INTEGER;
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// calculate string width in pixels
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strWidth *: PROCEDURE (charQuantity, charHeight: INTEGER): INTEGER;
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PROCEDURE params* (charHeight, charWidth, encoding, flags: INTEGER): INTEGER;
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(*
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hh = char height
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ww = char width ; 0 = auto (proportional)
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ee = encoding ; 1 = cp866, 2 = UTF-16LE, 3 = UTF-8
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ff = flags ; 0001 = bold, 0010 = italic
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; 0100 = underline, 1000 = strike-through
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00010000 = align right, 00100000 = align center
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01000000 = set text area between higher and lower halfs of 'x'
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10000000 = 32bpp canvas insted of 24bpp
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all flags combinable, except align right + align center
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*)
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RETURN charHeight + LSL(charWidth, 8) + LSL(encoding, 16) + LSL(flags, 24)
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END params;
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PROCEDURE main;
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VAR Lib: INTEGER;
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PROCEDURE GetProc(Lib, v: INTEGER; name: ARRAY OF CHAR);
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VAR a: INTEGER;
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BEGIN
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a := KOSAPI.GetProcAdr(name, Lib);
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ASSERT(a # 0);
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sys.PUT(v, a)
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END GetProc;
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BEGIN
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Lib := KOSAPI.LoadLib("/rd/1/lib/RasterWorks.obj");
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ASSERT(Lib # 0);
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GetProc(Lib, sys.ADR(drawText), "drawText");
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GetProc(Lib, sys.ADR(cntUTF_8), "cntUTF-8");
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GetProc(Lib, sys.ADR(charsFit), "charsFit");
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GetProc(Lib, sys.ADR(strWidth), "strWidth");
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END main;
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BEGIN
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main
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END RasterWorks.
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