SDL_ttf 显示汉字的方法
SDL_ttf 是SDL基本库的一个扩展。这里我抄录了官方的一个例程：
showfont.c
他这里只是一个main函数，讲了一下整个库的基本用法。
我打算做一个简单的封装，专门为了眼前要做的游戏。
/*
showfont.c
他这里只是一个main函数，讲了一下整个库的基本用法。
我打算做一个简单的封装，专门为了眼前要做的游戏。
/*
showfont: An example of using the SDL_ttf library with 2D graphics.
Copyright (C) 1997-2004 Sam Lantinga
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Sam Lantinga
[email protected]
*/
/* $Id: showfont.c,v 1.10 2006/03/14 08:27:50 slouken Exp $ */
/* A simple program to test the text rendering feature of the TTF library */
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#ifdef HAVE_ICONV
#include <iconv.h>
#endif
#include "SDL.h"
#include "SDL_ttf.h"
#define DEFAULT_PTSIZE 18
#define DEFAULT_TEXT "The quick brown fox jumped over the lazy dog"
#define NUM_COLORS 256
static char *Usage =
"Usage: %s [-solid] [-utf8|-unicode] [-b] [-i] [-u] [-fgcol r,g,b] [-bgcol r,g,b] <font>.ttf [ptsize] [text]/n";
int main(int argc, char *argv[])
{
char *argv0 = argv[0];
SDL_Surface *screen;
TTF_Font *font;
SDL_Surface *text, *temp;
int ptsize;
int i, done;
int rdiff, gdiff, bdiff;
SDL_Color colors[NUM_COLORS];
SDL_Color white = { 0xFF, 0xFF, 0xFF, 0 };
SDL_Color black = { 0x00, 0x00, 0x00, 0 };
SDL_Color *forecol;
SDL_Color *backcol;
SDL_Rect dstrect;
SDL_Event event;
int rendersolid;
int renderstyle;
int dump;
enum {
RENDER_LATIN1,
RENDER_UTF8,
RENDER_UNICODE
} rendertype;
char *message, string[128];
/* Look for special execution mode */
dump = 0;
/* Look for special rendering types */
rendersolid = 0;
renderstyle = TTF_STYLE_NORMAL;
rendertype = RENDER_LATIN1;
/* Default is black and white */
forecol = &black;
backcol = &white;
for ( i=1; argv[i] && argv[i][0] == '-'; ++i ) {
if ( strcmp(argv[i], "-solid") == 0 ) {
rendersolid = 1;
} else
if ( strcmp(argv[i], "-utf8") == 0 ) {
rendertype = RENDER_UTF8;
} else
if ( strcmp(argv[i], "-unicode") == 0 ) {
rendertype = RENDER_UNICODE;
} else
if ( strcmp(argv[i], "-b") == 0 ) {
renderstyle |= TTF_STYLE_BOLD;
} else
if ( strcmp(argv[i], "-i") == 0 ) {
renderstyle |= TTF_STYLE_ITALIC;
} else
if ( strcmp(argv[i], "-u") == 0 ) {
renderstyle |= TTF_STYLE_UNDERLINE;
} else
if ( strcmp(argv[i], "-dump") == 0 ) {
dump = 1;
} else
if ( strcmp(argv[i], "-fgcol") == 0 ) {
int r, g, b;
if ( sscanf (argv[++i], "%d,%d,%d", &r, &g, &b) != 3 ) {
fprintf(stderr, Usage, argv0);
return(1);
}
forecol->r = (Uint8)r;
forecol->g = (Uint8)g;
forecol->b = (Uint8)b;
} else
if ( strcmp(argv[i], "-bgcol") == 0 ) {
int r, g, b;
if ( sscanf (argv[++i], "%d,%d,%d", &r, &g, &b) != 3 ) {
fprintf(stderr, Usage, argv0);
return(1);
}
backcol->r = (Uint8)r;
backcol->g = (Uint8)g;
backcol->b = (Uint8)b;
} else {
fprintf(stderr, Usage, argv0);
return(1);
}
}
argv += i;
argc -= i;
/* Check usage */
if ( ! argv[0] ) {
fprintf(stderr, Usage, argv0);
return(1);
}
/* Initialize SDL */
if ( SDL_Init(SDL_INIT_VIDEO) < 0 ) {
fprintf(stderr, "Couldn't initialize SDL: %s/n",SDL_GetError());
return(2);
}
atexit(SDL_Quit);
/* Initialize the TTF library */
if ( TTF_Init() < 0 ) {
fprintf(stderr, "Couldn't initialize TTF: %s/n",SDL_GetError());
return(2);
}
atexit(TTF_Quit);
/* Open the font file with the requested point size */
ptsize = 0;
if ( argc > 1 ) {
ptsize = atoi(argv[1]);
}
if ( ptsize == 0 ) {
i = 2;
ptsize = DEFAULT_PTSIZE;
} else {
i = 3;
}
font = TTF_OpenFont(argv[0], ptsize);
if ( font == NULL ) {
fprintf(stderr, "Couldn't load %d pt font from %s: %s/n",
ptsize, argv[0], SDL_GetError());
return(2);
}
TTF_SetFontStyle(font, renderstyle);
if( dump ) {
for( i = 48; i < 123; i++ ) {
SDL_Surface* glyph = NULL;
glyph = TTF_RenderGlyph_Shaded( font, i, *forecol, *backcol );
if( glyph ) {
char outname[64];
sprintf( outname, "glyph-%d.bmp", i );
SDL_SaveBMP( glyph, outname );
}
}
return( 0 );
}
/* Set a 640x480x8 video mode */
screen = SDL_SetVideoMode(640, 480, 8, SDL_SWSURFACE);
if ( screen == NULL ) {
fprintf(stderr, "Couldn't set 640x480x8 video mode: %s/n",
SDL_GetError());
return(2);
}
/* Set a palette that is good for the foreground colored text */
rdiff = backcol->r - forecol->r;
gdiff = backcol->g - forecol->g;
bdiff = backcol->b - forecol->b;
for ( i=0; i<NUM_COLORS; ++i ) {
colors[i].r = forecol->r + (i*rdiff)/4;
colors[i].g = forecol->g + (i*gdiff)/4;
colors[i].b = forecol->b + (i*bdiff)/4;
}
SDL_SetColors(screen, colors, 0, NUM_COLORS);
/* Clear the background to background color */
SDL_FillRect(screen, NULL,
SDL_MapRGB(screen->format, backcol->r, backcol->g, backcol->b));
SDL_UpdateRect(screen, 0, 0, 0, 0);
/* Show which font file we're looking at */
sprintf(string, "Font file: %s", argv[0]); /* possible overflow */
if ( rendersolid ) {
text = TTF_RenderText_Solid(font, string, *forecol);
} else {
text = TTF_RenderText_Shaded(font, string, *forecol, *backcol);
}
if ( text != NULL ) {
dstrect.x = 4;
dstrect.y = 4;
dstrect.w = text->w;
dstrect.h = text->h;
SDL_BlitSurface(text, NULL, screen, &dstrect);
SDL_FreeSurface(text);
}
/* Render and center the message */
if ( argc > 2 ) {
message = argv[2];
} else {
message = DEFAULT_TEXT;
}
switch (rendertype) {
case RENDER_LATIN1:
if ( rendersolid ) {
text = TTF_RenderText_Solid(font,message,*forecol);
} else {
text = TTF_RenderText_Shaded(font,message,*forecol,*backcol);
}
break;
case RENDER_UTF8:
if ( rendersolid ) {
text = TTF_RenderUTF8_Solid(font,message,*forecol);
} else {
text = TTF_RenderUTF8_Shaded(font,message,*forecol,*backcol);
}
break;
case RENDER_UNICODE:
{
Uint16 unicode_text[BUFSIZ];
int index;
#ifdef HAVE_ICONV
/* Use iconv to convert the message into utf-16.
* "char" and "" are aliases for the local 8-bit encoding */
iconv_t cd;
/*ICONV_CONST*/ char *from_str = message;
char *to_str = (char*)unicode_text;
size_t from_sz = strlen(message) + 1;
size_t to_sz = sizeof(unicode_text);
size_t res;
int i;
if ((cd = iconv_open("UTF-16", "char")) == (iconv_t)-1
&& (cd = iconv_open("UTF-16", "")) == (iconv_t)-1) {
perror("Couldn't open iconv");
exit(1);
}
res = iconv(cd, &from_str, &from_sz, &to_str, &to_sz);
if (res == -1) {
perror("Couldn't use iconv");
exit(1);
}
iconv_close(cd);
#else
/* Convert the message from ascii into utf-16.
* This is unreliable as a test because it always
* gives the local ordering. */
for (index = 0; message[index]; index++) {
unicode_text[index] = message[index];
}
unicode_text[index] = 0;
#endif
if ( rendersolid ) {
text = TTF_RenderUNICODE_Solid(font,
unicode_text, *forecol);
} else {
text = TTF_RenderUNICODE_Shaded(font,
unicode_text, *forecol, *backcol);
}
}
break;
default:
text = NULL; /* This shouldn't happen */
break;
}
if ( text == NULL ) {
fprintf(stderr, "Couldn't render text: %s/n", SDL_GetError());
TTF_CloseFont(font);
return(2);
}
dstrect.x = (screen->w - text->w)/2;
dstrect.y = (screen->h - text->h)/2;
dstrect.w = text->w;
dstrect.h = text->h;
printf("Font is generally %d big, and string is %hd big/n",
TTF_FontHeight(font), text->h);
/* Blit the text surface */
if ( SDL_BlitSurface(text, NULL, screen, &dstrect) < 0 ) {
fprintf(stderr, "Couldn't blit text to display: %s/n",
SDL_GetError());
TTF_CloseFont(font);
return(2);
}
SDL_UpdateRect(screen, 0, 0, 0, 0);
/* Set the text colorkey and convert to display format */
if ( SDL_SetColorKey(text, SDL_SRCCOLORKEY|SDL_RLEACCEL, 0) < 0 ) {
fprintf(stderr, "Warning: Couldn't set text colorkey: %s/n",
SDL_GetError());
}
temp = SDL_DisplayFormat(text);
if ( temp != NULL ) {
SDL_FreeSurface(text);
text = temp;
}
/* Wait for a keystroke, and blit text on mouse press */
done = 0;
while ( ! done ) {
if ( SDL_WaitEvent(&event) < 0 ) {
fprintf(stderr, "SDL_PullEvent() error: %s/n",
SDL_GetError());
done = 1;
continue;
}
switch (event.type) {
case SDL_MOUSEBUTTONDOWN:
dstrect.x = event.button.x - text->w/2;
dstrect.y = event.button.y - text->h/2;
dstrect.w = text->w;
dstrect.h = text->h;
if ( SDL_BlitSurface(text, NULL, screen,
&dstrect) == 0 ) {
SDL_UpdateRects(screen, 1, &dstrect);
} else {
fprintf(stderr,
"Couldn't blit text to display: %s/n",
SDL_GetError());
}
break;
case SDL_KEYDOWN:
case SDL_QUIT:
done = 1;
break;
default:
break;
}
}
SDL_FreeSurface(text);
TTF_CloseFont(font);
return(0);
}