warzone2100/lib/ivis_opengl/textdraw.cpp

198 lines
5.2 KiB
C++

/*
This file is part of Warzone 2100.
Copyright (C) 1999-2004 Eidos Interactive
Copyright (C) 2005-2011 Warzone 2100 Project
Warzone 2100 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 2 of the License, or
(at your option) any later version.
Warzone 2100 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 Warzone 2100; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "lib/framework/frame.h"
#include "lib/framework/opengl.h"
#include <stdlib.h>
#include <string.h>
#include "lib/framework/string_ext.h"
#include "lib/ivis_opengl/ivisdef.h"
#include "lib/ivis_opengl/piestate.h"
#include "lib/ivis_opengl/pieclip.h"
#include "lib/ivis_opengl/pieblitfunc.h"
#include "lib/ivis_opengl/piepalette.h"
#include "lib/ivis_opengl/textdraw.h"
#include "lib/ivis_opengl/bitimage.h"
#include "src/multiplay.h"
#define ASCII_SPACE (32)
#define ASCII_NEWLINE ('@')
#define ASCII_COLOURMODE ('#')
/** Draws formatted text with word wrap, long word splitting, embedded newlines
* (uses '@' rather than '\n') and colour toggle mode ('#') which enables or
* disables font colouring.
*
* @param String the string to display.
* @param x,y X and Y coordinates of top left of formatted text.
* @param width the maximum width of the formatted text (beyond which line
* wrapping is used).
* @param justify The alignment style to use, which is one of the following:
* FTEXT_LEFTJUSTIFY, FTEXT_CENTRE or FTEXT_RIGHTJUSTIFY.
* @return the Y coordinate for the next text line.
*/
int iV_DrawFormattedText(const char* String, UDWORD x, UDWORD y, UDWORD Width, UDWORD Justify)
{
char FString[256];
char FWord[256];
int i;
int jx = x; // Default to left justify.
int jy = y;
UDWORD WWidth;
int TWidth;
const char* curChar = String;
while (*curChar != 0)
{
bool GotSpace = false;
bool NewLine = false;
// Reset text draw buffer
FString[0] = 0;
WWidth = 0;
// Parse through the string, adding words until width is achieved.
while (*curChar != 0 && WWidth < Width && !NewLine)
{
const char* startOfWord = curChar;
const unsigned int FStringWidth = iV_GetTextWidth(FString);
// Get the next word.
i = 0;
for (; *curChar != 0
&& *curChar != ASCII_SPACE
&& *curChar != ASCII_NEWLINE
&& *curChar != '\n';
++i, ++curChar)
{
if (*curChar == ASCII_COLOURMODE) // If it's a colour mode toggle char then just add it to the word.
{
FWord[i] = *curChar;
// this character won't be drawn so don't deal with its width
continue;
}
// Update this line's pixel width.
WWidth = FStringWidth + iV_GetCountedTextWidth(FWord, i + 1);
// If this word doesn't fit on the current line then break out
if (WWidth > Width)
{
break;
}
// If width ok then add this character to the current word.
FWord[i] = *curChar;
}
// Don't forget the space.
if (*curChar == ASCII_SPACE)
{
// Should be a space below, not '-', but need to work around bug in QuesoGLC
// which was fixed in CVS snapshot as of 2007/10/26, same day as I reported it :) - Per
WWidth += iV_GetCharWidth('-');
if (WWidth <= Width)
{
FWord[i] = ' ';
++i;
++curChar;
GotSpace = true;
}
}
// Check for new line character.
else if (*curChar == ASCII_NEWLINE
|| *curChar == '\n')
{
if (!bMultiPlayer)
{
NewLine = true;
}
++curChar;
}
// If we've passed a space on this line and the word goes past the
// maximum width and this isn't caused by the appended space then
// rewind to the start of this word and finish this line.
if (GotSpace
&& WWidth > Width
&& FWord[i - 1] != ' ')
{
// Skip back to the beginning of this
// word and draw it on the next line
curChar = startOfWord;
break;
}
// Terminate the word.
FWord[i] = 0;
// And add it to the output string.
sstrcat(FString, FWord);
}
// Remove trailing spaces, useful when doing center alignment.
{
// Find the string length (the "minus one" part
// guarantees that we get the length of the string, not
// the buffer size required to contain it).
size_t len = strnlen1(FString, sizeof(FString)) - 1;
for (; len != 0; --len)
{
// As soon as we encounter a non-space character, break out
if (FString[len] != ASCII_SPACE)
break;
// Cut off the current space character from the string
FString[len] = '\0';
}
}
TWidth = iV_GetTextWidth(FString);
// Do justify.
switch (Justify)
{
case FTEXT_CENTRE:
jx = x + (Width - TWidth) / 2;
break;
case FTEXT_RIGHTJUSTIFY:
jx = x + Width - TWidth;
break;
case FTEXT_LEFTJUSTIFY:
jx = x;
break;
}
// draw the text.
iV_DrawText(FString, jx, jy);
// and move down a line.
jy += iV_GetTextLineSize();
}
return jy;
}