src/ui/console_log.c

   1 #include "system/stacktrace.h"
   2 #include <stdlib.h>
   3 #include <SDL2/SDL.h>
   4
   5 #include "color.h"
   6 #include "game/sprite_font.h"
   7 #include "console_log.h"
   8 #include "math/point.h"
   9 #include "system/str.h"
  10 #include "system/lt.h"
  11 #include "system/nth_alloc.h"
  12
  13 struct Console_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 Console_Log *create_console_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     Console_Log *console_log = PUSH_LT(lt, nth_alloc(sizeof(Console_Log)), free);
  36     if (console_log == NULL) {
  37         RETURN_LT(lt, NULL);
  38     }
  39     console_log->lt = lt;
  40     console_log->font = font;
  41     console_log->font_size = font_size;
  42     console_log->capacity = capacity;
  43
  44     console_log->buffer = PUSH_LT(lt, nth_calloc(capacity, sizeof(char*)), free);
  45     if (console_log->buffer == NULL) {
  46         RETURN_LT(lt, NULL);
  47     }
  48
  49     console_log->colors = PUSH_LT(lt, nth_calloc(capacity, sizeof(Color)), free);
  50     if (console_log->colors == NULL) {
  51         RETURN_LT(lt, NULL);
  52     }
  53
  54     console_log->cursor = 0;
  55
  56     return console_log;
  57 }
  58
  59 void destroy_console_log(Console_Log *console_log)
  60 {
  61     trace_assert(console_log);
  62     for (size_t i = 0; i < console_log->capacity; ++i) {
  63         if (console_log->buffer[i]) {
  64             free(console_log->buffer[i]);
  65         }
  66     }
  67     RETURN_LT0(console_log->lt);
  68 }
  69
  70 int console_log_render(const Console_Log *console_log,
  71                SDL_Renderer *renderer,
  72                Point position)
  73 {
  74     trace_assert(console_log);
  75     trace_assert(renderer);
  76     (void) position;
  77
  78     for (size_t i = 0; i < console_log->capacity; ++i) {
  79         const size_t j = (i + console_log->cursor) % console_log->capacity;
  80         if (console_log->buffer[j]) {
  81             if (sprite_font_render_text(console_log->font,
  82                                         renderer,
  83                                         vec_sum(position,
  84                                                 vec(0.0f, FONT_CHAR_HEIGHT * console_log->font_size.y * (float) i)),
  85                                         console_log->font_size,
  86                                         console_log->colors[j],
  87                                         console_log->buffer[j]) < 0) {
  88                 return -1;
  89             }
  90         }
  91     }
  92
  93     return 0;
  94 }
  95
  96 int console_log_push_line(Console_Log *console_log, const char *line, Color color)
  97 {
  98     trace_assert(console_log);
  99     trace_assert(line);
 100
 101     const size_t next_cursor = (console_log->cursor + 1) % console_log->capacity;
 102
 103     if (console_log->buffer[console_log->cursor] != NULL) {
 104         free(console_log->buffer[console_log->cursor]);
 105     }
 106
 107     console_log->buffer[console_log->cursor] = string_duplicate(line, NULL);
 108     console_log->colors[console_log->cursor] = color;
 109
 110     if (console_log->buffer[console_log->cursor] == NULL) {
 111         return -1;
 112     }
 113
 114     console_log->cursor = next_cursor;
 115
 116     return 0;
 117 }