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     Color font_color;
  20
  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                 Color font_color,
  29                 size_t capacity)
  30 {
  31     Lt *lt = create_lt();
  32     if (lt == NULL) {
  33         return NULL;
  34     }
  35
  36     Log *log = PUSH_LT(lt, malloc(sizeof(Log)), free);
  37     if (log == NULL) {
  38         throw_error(ERROR_TYPE_LIBC);
  39         RETURN_LT(lt, NULL);
  40     }
  41     log->lt = lt;
  42     log->font = font;
  43     log->font_size = font_size;
  44     log->font_color = font_color;
  45     log->capacity = capacity;
  46
  47     log->buffer = PUSH_LT(lt, calloc(capacity, sizeof(char*)), free);
  48     if (log->buffer == NULL) {
  49         throw_error(ERROR_TYPE_LIBC);
  50         RETURN_LT(lt, NULL);
  51     }
  52     log->cursor = 0;
  53
  54     return log;
  55 }
  56
  57 void destroy_log(Log *log)
  58 {
  59     assert(log);
  60     RETURN_LT0(log->lt);
  61 }
  62
  63 int log_render(const Log *log,
  64                SDL_Renderer *renderer,
  65                Point position)
  66 {
  67     assert(log);
  68     assert(renderer);
  69     (void) position;
  70
  71     for (size_t i = 0; log->capacity; ++i) {
  72         const size_t j = (i + log->cursor) % log->capacity;
  73         if (log->buffer[j]) {
  74             if (sprite_font_render_text(log->font,
  75                                         renderer,
  76                                         vec_sum(position,
  77                                                 vec(0.0f, FONT_CHAR_HEIGHT * log->font_size.y * (float) i)),
  78                                         log->font_size,
  79                                         log->font_color,
  80                                         log->buffer[j]) < 0) {
  81                 return -1;
  82             }
  83         }
  84     }
  85
  86     return 0;
  87 }
  88
  89 int log_push_line(Log *log, const char *line)
  90 {
  91     assert(log);
  92     assert(line);
  93
  94     const size_t next_cursor = (log->cursor + 1) % log->capacity;
  95
  96     if (log->buffer[log->cursor] != NULL) {
  97         free(log->buffer[log->cursor]);
  98     }
  99
 100     log->buffer[log->cursor] = string_duplicate(line, NULL);
 101
 102     if (log->buffer[log->cursor] == NULL) {
 103         return -1;
 104     }
 105
 106     log->cursor = next_cursor;
 107
 108     return 0;
 109 }