demos/c_simple/fonttest.c

   1 /*****************************************************************************
   2  * This file is part of gfxprim library.                                     *
   3  *                                                                           *
   4  * Gfxprim is free software; you can redistribute it and/or                  *
   5  * modify it under the terms of the GNU Lesser General Public                *
   6  * License as published by the Free Software Foundation; either              *
   7  * version 2.1 of the License, or (at your option) any later version.        *
   8  *                                                                           *
   9  * Gfxprim is distributed in the hope that it will be useful,                *
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of            *
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU         *
  12  * Lesser General Public License for more details.                           *
  13  *                                                                           *
  14  * You should have received a copy of the GNU Lesser General Public          *
  15  * License along with gfxprim; if not, write to the Free Software            *
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor,                        *
  17  * Boston, MA  02110-1301  USA                                               *
  18  *                                                                           *
  19  * Copyright (C) 2009-2010 Jiri "BlueBear" Dluhos                            *
  20  *                         <jiri.bluebear.dluhos@gmail.com>                  *
  21  *                                                                           *
  22  * Copyright (C) 2009-2013 Cyril Hrubis <metan@ucw.cz>                       *
  23  *                                                                           *
  24  *****************************************************************************/
  25
  26 #include <stdio.h>
  27 #include <stdlib.h>
  28 #include <string.h>
  29
  30 #include <GP.h>
  31
  32 static GP_Backend *win;
  33
  34 static const char *font_path = NULL;
  35 static unsigned int font_h = 16;
  36
  37 static GP_Pixel white_pixel, gray_pixel, dark_gray_pixel, black_pixel,
  38                 red_pixel, blue_pixel;
  39
  40 static const char *test_strings[] = {
  41         " !\"#$%&\047()*+,-./0123456789:;<=>?@",
  42         "ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`",
  43         "abcdefghijklmnopqrstuvwxyz{|}~",
  44         "Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor..."
  45 };
  46
  47 static int font_flag = 0;
  48 static int tracking = 0;
  49 static GP_FontFace *font = NULL;
  50
  51 static const char *glyph_bitmap_format_name(const GP_FontBitmapFormat format)
  52 {
  53         switch (format) {
  54         case GP_FONT_BITMAP_1BPP:
  55                 return "1BPP";
  56         break;
  57         case GP_FONT_BITMAP_8BPP:
  58                 return "8BPP";
  59         break;
  60         default:
  61                 return "Unknown";
  62         }
  63 }
  64
  65 static void print_character_metadata(const GP_FontFace *font, int c)
  66 {
  67         const GP_GlyphBitmap *glyph = GP_GetGlyphBitmap(font, c);
  68         fprintf(stderr, "Properties of the character '%c':\n", c);
  69
  70         if (glyph) {
  71                 fprintf(stderr, "   bitmap width: %d, height: %d\n",
  72                                 glyph->width, glyph->height);
  73                 fprintf(stderr, "          bearing_x: %d bearing_y %d\n",
  74                                 glyph->bearing_x, glyph->bearing_y);
  75                 fprintf(stderr, "          advance_x: %d\n",
  76                                 glyph->advance_x);
  77         } else {
  78                 fprintf(stderr, "(null)\n");
  79         }
  80 }
  81
  82 static void print_font_properties(const GP_FontFace *font)
  83 {
  84         fprintf(stderr, "Font '%s %s' properties:\n",
  85                         GP_FontFamily(font), GP_FontStyle(font));
  86         fprintf(stderr, "    Height: ascend: %d, descend: %d\n",
  87                         GP_FontAscend(font), GP_FontDescend(font));
  88         fprintf(stderr, "    Max advance_x: %u\n",
  89                         GP_FontMaxAdvanceX(font));
  90         fprintf(stderr, "    Glyph bitmap format: %s\n",
  91                         glyph_bitmap_format_name(font->glyph_bitmap_format));
  92         fprintf(stderr, "    Bounding box width: %d, heigth: %d\n",
  93                         GP_FontMaxWidth(font), GP_FontHeight(font));
  94
  95         print_character_metadata(font, 'a');
  96         print_character_metadata(font, 'm');
  97         print_character_metadata(font, '0');
  98 }
  99
 100 #define SPACING 120
 101
 102 void redraw_screen(void)
 103 {
 104         GP_Fill(win->context, black_pixel);
 105
 106         GP_TextStyle style = GP_DEFAULT_TEXT_STYLE;
 107
 108         switch (font_flag) {
 109         case 0:
 110                 style.font = &GP_DefaultProportionalFont;
 111         break;
 112         case 1:
 113                 style.font = &GP_DefaultConsoleFont;
 114         break;
 115         case 2:
 116                 style.font = GP_FontTiny;
 117         break;
 118         case 3:
 119                 style.font = GP_FontTinyMono;
 120         break;
 121         case 4:
 122                 style.font = GP_FontC64;
 123         break;
 124         case 5:
 125                 style.font = font;
 126         break;
 127         }
 128
 129         print_font_properties(style.font);
 130
 131         /* Text alignment (we are always drawing to the right
 132          * and below the starting point).
 133          */
 134         int align = GP_ALIGN_RIGHT|GP_VALIGN_BELOW;
 135
 136         const size_t TEST_STRING_COUNT = sizeof(test_strings)/sizeof(const char *);
 137         size_t i;
 138         for (i = 0; i < TEST_STRING_COUNT; i++) {
 139                 const char *test_string = test_strings[i];
 140
 141                 style.pixel_xmul = 1;
 142                 style.pixel_ymul = 1;
 143                 style.pixel_xspace = 0;
 144                 style.pixel_yspace = 0;
 145                 style.char_xspace = tracking;
 146
 147                 GP_FillRectXYWH(win->context,
 148                         16, SPACING*i + 16,
 149                         GP_TextWidth(&style, test_string),
 150                         GP_FontHeight(style.font),
 151                         dark_gray_pixel);
 152
 153                 GP_RectXYWH(win->context,
 154                         15, SPACING*i + 15,
 155                         GP_TextMaxWidth(&style, strlen(test_string)) + 1,
 156                         GP_FontHeight(style.font) + 1,
 157                         blue_pixel);
 158
 159                 GP_Text(win->context, &style, 16, SPACING*i + 16, align,
 160                         white_pixel, dark_gray_pixel, test_string);
 161
 162                 style.pixel_xmul = 2;
 163                 style.pixel_ymul = 2;
 164                 style.pixel_yspace = 1;
 165
 166                 GP_Text(win->context, &style, 34, SPACING * i + 44, align,
 167                         white_pixel, black_pixel, test_string);
 168
 169                 GP_RectXYWH(win->context, 33, SPACING * i + 43,
 170                             GP_TextWidth(&style, test_string) + 1,
 171                             GP_TextHeight(&style) + 1, dark_gray_pixel);
 172
 173                 style.pixel_xmul = 4;
 174                 style.pixel_ymul = 2;
 175
 176                 style.pixel_xspace = 1;
 177                 style.pixel_yspace = 1;
 178
 179                 if (font_flag == 2 || font_flag == 3) {
 180                         style.pixel_xmul = 2;
 181                         style.pixel_ymul = 5;
 182
 183                         style.pixel_xspace = 2;
 184                         style.pixel_yspace = 2;
 185                 }
 186
 187                 GP_Text(win->context, &style, 64, SPACING*i + 88, align,
 188                         dark_gray_pixel, black_pixel, test_string);
 189         }
 190 }
 191
 192 void event_loop(void)
 193 {
 194         GP_Event ev;
 195
 196         for (;;) {
 197                 GP_BackendWaitEvent(win, &ev);
 198
 199                 switch (ev.type) {
 200                 case GP_EV_KEY:
 201                         if (ev.code != GP_EV_KEY_DOWN)
 202                                 continue;
 203
 204                         switch (ev.val.key.key) {
 205                         case GP_KEY_SPACE:
 206                                 if (font)
 207                                         font_flag = (font_flag + 1) % 6;
 208                                 else
 209                                         font_flag = (font_flag + 1) % 5;
 210
 211                                 redraw_screen();
 212                                 GP_BackendFlip(win);
 213                         break;
 214                         case GP_KEY_UP:
 215                                 tracking++;
 216                                 redraw_screen();
 217                                 GP_BackendFlip(win);
 218                         break;
 219                         case GP_KEY_DOWN:
 220                                 tracking--;
 221                                 redraw_screen();
 222                                 GP_BackendFlip(win);
 223                         break;
 224                         case GP_KEY_B:
 225                                 font_h++;
 226                                 if (font_path) {
 227                                         GP_FontFaceFree(font);
 228                                         font = GP_FontFaceLoad(font_path, 0, font_h);
 229                                         redraw_screen();
 230                                         GP_BackendFlip(win);
 231                                 }
 232                         break;
 233                         case GP_KEY_S:
 234                                 font_h--;
 235                                 if (font_path) {
 236                                         GP_FontFaceFree(font);
 237                                         font = GP_FontFaceLoad(font_path, 0, font_h);
 238                                         redraw_screen();
 239                                         GP_BackendFlip(win);
 240                                 }
 241                         break;
 242                         case GP_KEY_ESC:
 243                                 GP_BackendExit(win);
 244                                 exit(0);
 245                         break;
 246                         }
 247                 }
 248         }
 249 }
 250
 251 void print_instructions(void)
 252 {
 253         printf("Use the following keys to control the test:\n");
 254         printf("    Esc ................. exit\n");
 255         printf("    Space ............... change font\n");
 256         printf("    up/down ............. increase/decrease tracking\n");
 257         printf("    b/s ................. change font size (freetype only)\n");
 258 }
 259
 260 int main(int argc, char *argv[])
 261 {
 262         const char *backend_opts = "X11";
 263
 264         print_instructions();
 265
 266         GP_SetDebugLevel(10);
 267
 268         if (argc > 1) {
 269                 font_path = argv[1];
 270                 fprintf(stderr, "\nLoading font '%s'\n", argv[1]);
 271                 font = GP_FontFaceLoad(argv[1], 0, font_h);
 272         }
 273
 274         win = GP_BackendInit(backend_opts, "Font Test");
 275
 276         if (win == NULL) {
 277                 fprintf(stderr, "Failed to initalize backend '%s'\n",
 278                         backend_opts);
 279                 return 1;
 280         }
 281
 282         white_pixel     = GP_ColorToContextPixel(GP_COL_WHITE, win->context);
 283         gray_pixel      = GP_ColorToContextPixel(GP_COL_GRAY_LIGHT, win->context);
 284         dark_gray_pixel = GP_ColorToContextPixel(GP_COL_GRAY_DARK, win->context);
 285         black_pixel     = GP_ColorToContextPixel(GP_COL_BLACK, win->context);
 286         red_pixel       = GP_ColorToContextPixel(GP_COL_RED, win->context);
 287         blue_pixel      = GP_ColorToContextPixel(GP_COL_BLUE, win->context);
 288
 289         redraw_screen();
 290         GP_BackendFlip(win);
 291
 292         event_loop();
 293
 294         return 0;
 295 }