tests/SDL/subcontext.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) 2009-2011 Cyril Hrubis <metan@ucw.cz>                       *
  23  *                                                                           *
  24  *****************************************************************************/
  25
  26 #include <stdio.h>
  27 #include <stdlib.h>
  28 #include <math.h>
  29 #include <SDL/SDL.h>
  30
  31 #include "GP.h"
  32 #include "GP_SDL.h"
  33
  34 static GP_Pixel black, white, gray;
  35
  36 SDL_Surface *display = NULL;
  37 GP_Context context, *sub_context;
  38
  39 SDL_TimerID timer;
  40
  41 SDL_UserEvent timer_event;
  42
  43 static int pause_flag = 0;
  44 static int draw_flag = 0;
  45
  46 Uint32 timer_callback(__attribute__((unused)) Uint32 interval,
  47                         __attribute__((unused)) void *param)
  48 {
  49         timer_event.type = SDL_USEREVENT;
  50         SDL_PushEvent((SDL_Event *) &timer_event);
  51         return 30;
  52 }
  53
  54 static void draw_line(GP_Context *dest, GP_Coord x, GP_Coord y,
  55                       GP_Size w, GP_Size h, GP_Color col)
  56 {
  57         GP_Coord x1, x2, y1, y2;
  58
  59         x1 = random() % w + x;
  60         y1 = random() % h + y;
  61         x2 = random() % w + x;
  62         y2 = random() % h + y;
  63
  64         GP_Line(dest, x1, y1, x2, y2, col);
  65 }
  66
  67 static void draw_triangle(GP_Context *dest, GP_Coord x, GP_Coord y,
  68                           GP_Size w, GP_Size h, GP_Color col, int flag)
  69 {
  70         GP_Coord x1, x2, x3, y1, y2, y3;
  71
  72         x1 = random() % w + x;
  73         y1 = random() % h + y;
  74         x2 = random() % w + x;
  75         y2 = random() % h + y;
  76         x3 = random() % w + x;
  77         y3 = random() % h + y;
  78
  79         if (flag)
  80                 GP_FillTriangle(dest, x1, y1, x2, y2, x3, y3, col);
  81         else
  82                 GP_Triangle(dest, x1, y1, x2, y2, x3, y3, col);
  83 }
  84
  85 static void draw_rect(GP_Context *dest, GP_Coord x, GP_Coord y,
  86                       GP_Size w, GP_Size h, GP_Color col, int flag)
  87 {
  88         GP_Coord x1, x2, y1, y2;
  89
  90         x1 = random() % w + x;
  91         y1 = random() % h + y;
  92         x2 = random() % w + x;
  93         y2 = random() % h + y;
  94
  95         if (flag)
  96                 GP_FillRect(dest, x1, y1, x2, y2, col);
  97         else
  98                 GP_Rect(dest, x1, y1, x2, y2, col);
  99 }
 100
 101 static void draw_circle(GP_Context *dest, GP_Coord x, GP_Coord y,
 102                         GP_Size w, GP_Size h, GP_Color col, int flag)
 103 {
 104         GP_Coord x1, y1, r;
 105
 106         r = random() % 150;
 107
 108         x1 = random() % (w - 2*r) + x + r;
 109         y1 = random() % (h - 2*r) + y + r;
 110
 111         if (flag)
 112                 GP_FillCircle(dest, x1, y1, r, col);
 113         else
 114                 GP_Circle(dest, x1, y1, r, col);
 115 }
 116
 117 #define TEXT "Lorem Ipsum Dolor Sit Amet"
 118
 119 static void draw_text(GP_Context *dest, GP_Coord x, GP_Coord y,
 120                       GP_Size w, GP_Size h, GP_Color col)
 121 {
 122         GP_Coord x1, y1;
 123         GP_Size tw, th;
 124
 125         tw = GP_TextWidth(NULL, TEXT);
 126         th = GP_TextHeight(NULL);
 127
 128         x1 = random() % (w - tw) + x;
 129         y1 = random() % (h - th) + y;
 130
 131         GP_Text(dest, NULL, x1, y1, GP_ALIGN_RIGHT|GP_VALIGN_BOTTOM, col, black, TEXT);
 132 }
 133
 134 void redraw_screen(void)
 135 {
 136         if (pause_flag)
 137                 return;
 138
 139         SDL_LockSurface(display);
 140
 141         uint8_t v = random() % 128 + 50;
 142         GP_Color col;
 143         if (sub_context->pixel_type == GP_PIXEL_P8)
 144                 col = random() % 256;
 145         else
 146                 col = GP_RGBToContextPixel(v, v, 255, sub_context);
 147
 148         /* frame around subcontext */
 149         GP_Rect(&context, 99, 99,  context.w - 100, context.h - 100, white);
 150
 151         switch (draw_flag) {
 152         case 0:
 153                 draw_line(sub_context, -100, -100, sub_context->w + 200, sub_context->h + 200, col);
 154         break;
 155         case 1:
 156                 draw_triangle(sub_context, -100, -100, sub_context->w + 200, sub_context->h + 200, col, 0);
 157         break;
 158         case 2:
 159                 draw_triangle(sub_context, -100, -100, sub_context->w + 200, sub_context->h + 200, col, 1);
 160         break;
 161         case 3:
 162                 draw_rect(sub_context, -100, -100, sub_context->w + 200, sub_context->h + 200, col, 0);
 163         break;
 164         case 4:
 165                 draw_rect(sub_context, -100, -100, sub_context->w + 200, sub_context->h + 200, col, 1);
 166         break;
 167         case 5:
 168                 draw_circle(sub_context, -100, -100, sub_context->w + 200, sub_context->h + 200, col, 0);
 169         break;
 170         case 6:
 171                 draw_circle(sub_context, -100, -100, sub_context->w + 200, sub_context->h + 200, col, 1);
 172         break;
 173         case 7:
 174                 draw_text(sub_context, -100, -100, sub_context->w + 200, sub_context->h + 200, col);
 175         break;
 176         }
 177
 178         SDL_Flip(display);
 179
 180         SDL_UnlockSurface(display);
 181 }
 182
 183 void clear_screen(void)
 184 {
 185         GP_Fill(&context, black);
 186         GP_Fill(sub_context, gray);
 187 }
 188
 189 void event_loop(void)
 190 {
 191         SDL_Event event;
 192
 193         while (SDL_WaitEvent(&event) > 0) {
 194
 195                 switch (event.type) {
 196
 197                 case SDL_USEREVENT:
 198                         redraw_screen();
 199                         break;
 200                 case SDL_KEYDOWN:
 201                         switch (event.key.keysym.sym) {
 202                         case SDLK_p:
 203                                 pause_flag = !pause_flag;
 204                         break;
 205                         case SDLK_SPACE:
 206                                 draw_flag = (draw_flag + 1) % 8;
 207                                 clear_screen();
 208                         break;
 209                         case SDLK_ESCAPE:
 210                                 return;
 211
 212                         default:
 213                                 break;
 214                         }
 215                         break;
 216                 case SDL_QUIT:
 217                         return;
 218                 default:
 219                         break;
 220                 }
 221         }
 222 }
 223
 224 int main(int argc, char *argv[])
 225 {
 226         /* Bits per pixel to be set for the display surface. */
 227         int display_bpp = 0;
 228
 229         int i;
 230         for (i = 1; i < argc; i++) {
 231                 if (strcmp(argv[i], "-8") == 0) {
 232                         display_bpp = 8;
 233                 } else if (strcmp(argv[i], "-16") == 0) {
 234                         display_bpp = 16;
 235                 }
 236                 else if (strcmp(argv[i], "-24") == 0) {
 237                         display_bpp = 24;
 238                 }
 239                 else if (strcmp(argv[i], "-32") == 0) {
 240                         display_bpp = 32;
 241                 }
 242         }
 243
 244         GP_SetDebugLevel(10);
 245
 246         if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_TIMER) != 0) {
 247                 fprintf(stderr, "Could not initialize SDL: %s\n", SDL_GetError());
 248                 return 1;
 249         }
 250
 251         display = SDL_SetVideoMode(640, 480, display_bpp, SDL_SWSURFACE);
 252         if (display == NULL) {
 253                 fprintf(stderr, "Could not open display: %s\n", SDL_GetError());
 254                 goto fail;
 255         }
 256
 257         GP_SDL_ContextFromSurface(&context, display);
 258
 259         black = GP_ColorToContextPixel(GP_COL_BLACK, &context);
 260         white = GP_ColorToContextPixel(GP_COL_WHITE, &context);
 261         gray  = GP_ColorToContextPixel(GP_COL_GRAY_DARK, &context);
 262
 263         sub_context = GP_ContextSubContext(&context, NULL, 100, 100, 440, 280);
 264         GP_Fill(sub_context, gray);
 265
 266         timer = SDL_AddTimer(60, timer_callback, NULL);
 267         if (timer == 0) {
 268                 fprintf(stderr, "Could not set up timer: %s\n", SDL_GetError());
 269                 goto fail;
 270         }
 271
 272         event_loop();
 273
 274         SDL_Quit();
 275         return 0;
 276
 277 fail:
 278         SDL_Quit();
 279         return 1;
 280 }
 281