src/ui/log.c

   1 #include <assert.h>
   2 #include <stdlib.h>
   3 #include <SDL2/SDL.h>
   4
   5 #include "color.h"
   6 #include "game/sprite_font.h"
   7 #include "log.h"
   8 #include "math/point.h"
   9 #include "str.h"
  10 #include "system/error.h"
  11 #include "system/lt.h"
  12
  13 struct Log
  14 {
  15     Lt *lt;
  16
  17     const Sprite_font *font;
  18     Vec font_size;
  19
  20     Color *colors;
  21     char **buffer;
  22     size_t cursor;
  23     size_t capacity;
  24 };
  25
  26 Log *create_log(const Sprite_font *font,
  27                 Vec font_size,
  28                 size_t capacity)
  29 {
  30     Lt *lt = create_lt();
  31     if (lt == NULL) {
  32         return NULL;
  33     }
  34
  35     Log *log = PUSH_LT(lt, malloc(sizeof(Log)), free);
  36     if (log == NULL) {
  37         throw_error(ERROR_TYPE_LIBC);
  38         RETURN_LT(lt, NULL);
  39     }
  40     log->lt = lt;
  41     log->font = font;
  42     log->font_size = font_size;
  43     log->capacity = capacity;
  44
  45     log->buffer = PUSH_LT(lt, calloc(capacity, sizeof(char*)), free);
  46     if (log->buffer == NULL) {
  47         throw_error(ERROR_TYPE_LIBC);
  48         RETURN_LT(lt, NULL);
  49     }
  50
  51     log->colors = PUSH_LT(lt, calloc(capacity, sizeof(Color)), free);
  52     if (log->colors == NULL) {
  53         throw_error(ERROR_TYPE_LIBC);
  54         RETURN_LT(lt, NULL);
  55     }
  56
  57     log->cursor = 0;
  58
  59     return log;
  60 }
  61
  62 void destroy_log(Log *log)
  63 {
  64     assert(log);
  65     for (size_t i = 0; i < log->capacity; ++i) {
  66         if (log->buffer[i]) {
  67             free(log->buffer[i]);
  68         }
  69     }
  70     RETURN_LT0(log->lt);
  71 }
  72
  73 int log_render(const Log *log,
  74                SDL_Renderer *renderer,
  75                Point position)
  76 {
  77     assert(log);
  78     assert(renderer);
  79     (void) position;
  80
  81     for (size_t i = 0; i < log->capacity; ++i) {
  82         const size_t j = (i + log->cursor) % log->capacity;
  83         if (log->buffer[j]) {
  84             if (sprite_font_render_text(log->font,
  85                                         renderer,
  86                                         vec_sum(position,
  87                                                 vec(0.0f, FONT_CHAR_HEIGHT * log->font_size.y * (float) i)),
  88                                         log->font_size,
  89                                         log->colors[j],
  90                                         log->buffer[j]) < 0) {
  91                 return -1;
  92             }
  93         }
  94     }
  95
  96     return 0;
  97 }
  98
  99 int log_push_line(Log *log, const char *line, Color color)
 100 {
 101     assert(log);
 102     assert(line);
 103
 104     const size_t next_cursor = (log->cursor + 1) % log->capacity;
 105
 106     if (log->buffer[log->cursor] != NULL) {
 107         free(log->buffer[log->cursor]);
 108     }
 109
 110     log->buffer[log->cursor] = string_duplicate(line, NULL);
 111     log->colors[log->cursor] = color;
 112
 113     if (log->buffer[log->cursor] == NULL) {
 114         return -1;
 115     }
 116
 117     log->cursor = next_cursor;
 118
 119     return 0;
 120 }