/*
  showfont:  An example of using the SDL_ttf library with 2D graphics.
  Copyright (C) 2001-2012 Sam Lantinga <slouken@libsdl.org>

  This software is provided 'as-is', without any express or implied
  warranty.  In no event will the authors be held liable for any damages
  arising from the use of this software.

  Permission is granted to anyone to use this software for any purpose,
  including commercial applications, and to alter it and redistribute it
  freely, subject to the following restrictions:

  1. The origin of this software must not be misrepresented; you must not
     claim that you wrote the original software. If you use this software
     in a product, an acknowledgment in the product documentation would be
     appreciated but is not required.
  2. Altered source versions must be plainly marked as such, and must not be
     misrepresented as being the original software.
  3. This notice may not be removed or altered from any source distribution.
*/

/* 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] [-s] [-outline size] [-hintlight|-hintmono|-hintnone] [-nokerning] [-fgcol r,g,b] [-bgcol r,g,b] <font>.ttf [ptsize] [text]\n";

static void cleanup(int exitcode)
{
	TTF_Quit();
	SDL_Quit();
	exit(exitcode);
}

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 outline;
	int hinting;
	int kerning;
	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;
	outline = 0;
	hinting = TTF_HINTING_NORMAL;
	kerning = 1;
	/* 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], "-s") == 0 ) {
			renderstyle |= TTF_STYLE_STRIKETHROUGH;
		} else
		if ( strcmp(argv[i], "-outline") == 0 ) {
			if ( sscanf (argv[++i], "%d", &outline) != 1 ) {
				fprintf(stderr, Usage, argv0);
				return(1);
			}
		} else
		if ( strcmp(argv[i], "-hintlight") == 0 ) {
			hinting = TTF_HINTING_LIGHT;
		} else
		if ( strcmp(argv[i], "-hintmono") == 0 ) {
			hinting = TTF_HINTING_MONO;
		} else
		if ( strcmp(argv[i], "-hintnone") == 0 ) {
			hinting = TTF_HINTING_NONE;
		} else
		if ( strcmp(argv[i], "-nokerning") == 0 ) {
			kerning = 0;
		} 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);
	}

	/* Initialize the TTF library */
	if ( TTF_Init() < 0 ) {
		fprintf(stderr, "Couldn't initialize TTF: %s\n",SDL_GetError());
		SDL_Quit();
		return(2);
	}

	/* 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());
		cleanup(2);
	}
	TTF_SetFontStyle(font, renderstyle);
	TTF_SetFontOutline(font, outline);
	TTF_SetFontKerning(font, kerning);
	TTF_SetFontHinting(font, hinting);

	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 );
			}

		}
		cleanup(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());
		cleanup(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);
		cleanup(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);
		cleanup(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);
	cleanup(0);

	/* Not reached, but fixes compiler warnings */
	return 0;
}