raze-gles/source/common/fonts/v_text.cpp

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