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171 lines
4.5 KiB
C++
171 lines
4.5 KiB
C++
/*
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** v_text.cpp
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** Draws text to a canvas. Also has a text line-breaker thingy.
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**
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**---------------------------------------------------------------------------
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** Copyright 1998-2006 Randy Heit
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** All rights reserved.
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**
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** Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions
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** are met:
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**
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** 1. Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** 2. Redistributions in binary form must reproduce the above copyright
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** notice, this list of conditions and the following disclaimer in the
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** documentation and/or other materials provided with the distribution.
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** 3. The name of the author may not be used to endorse or promote products
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** derived from this software without specific prior written permission.
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**
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** THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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** IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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** OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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** IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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** NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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** THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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**---------------------------------------------------------------------------
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**
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*/
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#include <stdlib.h>
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#include <stdarg.h>
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#include <ctype.h>
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#include <wctype.h>
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#include "v_text.h"
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#include "v_font.h"
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#include "utf8.h"
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//==========================================================================
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//
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// Break long lines of text into multiple lines no longer than maxwidth pixels
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//
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//==========================================================================
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static void breakit (FBrokenLines *line, FFont *font, const uint8_t *start, const uint8_t *stop, FString &linecolor)
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{
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if (!linecolor.IsEmpty())
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{
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line->Text = TEXTCOLOR_ESCAPE;
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line->Text += linecolor;
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}
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line->Text.AppendCStrPart ((const char *)start, stop - start);
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line->Width = font->StringWidth (line->Text);
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}
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TArray<FBrokenLines> V_BreakLines (FFont *font, int maxwidth, const uint8_t *string, bool preservecolor)
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{
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TArray<FBrokenLines> Lines(128);
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const uint8_t *space = NULL, *start = string;
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int c, w, nw;
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FString lastcolor, linecolor;
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bool lastWasSpace = false;
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int kerning = font->GetDefaultKerning ();
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// The real isspace is a bit too badly defined, so use our own one
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auto myisspace = [](int ch) { return ch == '\t' || ch == '\r' || ch == '\n' || ch == ' '; };
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w = 0;
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while ( (c = GetCharFromString(string)) )
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{
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if (c == TEXTCOLOR_ESCAPE)
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{
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if (*string)
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{
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if (*string == '[')
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{
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const uint8_t *start = string;
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while (*string != ']' && *string != '\0')
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{
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string++;
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}
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if (*string != '\0')
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{
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string++;
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}
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lastcolor = FString((const char *)start, string - start);
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}
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else
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{
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lastcolor = *string++;
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}
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}
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continue;
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}
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if (myisspace(c))
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{
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if (!lastWasSpace)
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{
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space = string - 1;
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lastWasSpace = true;
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}
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}
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else
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{
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lastWasSpace = false;
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}
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nw = font->GetCharWidth (c);
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if ((w > 0 && w + nw > maxwidth) || c == '\n')
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{ // Time to break the line
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if (!space)
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{
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for (space = string - 1; (*space & 0xc0) == 0x80 && space > start; space--);
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}
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auto index = Lines.Reserve(1);
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breakit (&Lines[index], font, start, space, linecolor);
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if (c == '\n' && !preservecolor)
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{
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lastcolor = ""; // Why, oh why, did I do it like this?
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}
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linecolor = lastcolor;
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w = 0;
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lastWasSpace = false;
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start = space;
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space = NULL;
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while (*start && myisspace (*start) && *start != '\n')
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start++;
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if (*start == '\n')
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start++;
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else
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while (*start && myisspace (*start))
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start++;
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string = start;
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}
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else
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{
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w += nw + kerning;
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}
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}
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// String here is pointing one character after the '\0'
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if (--string - start >= 1)
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{
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const uint8_t *s = start;
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while (s < string)
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{
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// If there is any non-white space in the remainder of the string, add it.
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if (!myisspace (*s++))
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{
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auto i = Lines.Reserve(1);
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breakit (&Lines[i], font, start, string, linecolor);
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break;
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}
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}
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}
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return Lines;
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}
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