src/ui/console_log.c

   1 #include "system/stacktrace.h"
   2 #include <stdlib.h>
   3 #include <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
  32     Console_Log *console_log = PUSH_LT(lt, nth_calloc(1, sizeof(Console_Log)), free);
  33     if (console_log == NULL) {
  34         RETURN_LT(lt, NULL);
  35     }
  36     console_log->lt = lt;
  37     console_log->font = font;
  38     console_log->font_size = font_size;
  39     console_log->capacity = capacity;
  40
  41     console_log->buffer = PUSH_LT(lt, nth_calloc(capacity, sizeof(char*)), free);
  42     if (console_log->buffer == NULL) {
  43         RETURN_LT(lt, NULL);
  44     }
  45
  46     console_log->colors = PUSH_LT(lt, nth_calloc(capacity, sizeof(Color)), free);
  47     if (console_log->colors == NULL) {
  48         RETURN_LT(lt, NULL);
  49     }
  50
  51     console_log->cursor = 0;
  52
  53     return console_log;
  54 }
  55
  56 void destroy_console_log(Console_Log *console_log)
  57 {
  58     trace_assert(console_log);
  59     for (size_t i = 0; i < console_log->capacity; ++i) {
  60         if (console_log->buffer[i]) {
  61             free(console_log->buffer[i]);
  62         }
  63     }
  64     RETURN_LT0(console_log->lt);
  65 }
  66
  67 int console_log_render(const Console_Log *console_log,
  68                SDL_Renderer *renderer,
  69                Point position)
  70 {
  71     trace_assert(console_log);
  72     trace_assert(renderer);
  73     (void) position;
  74
  75     for (size_t i = 0; i < console_log->capacity; ++i) {
  76         const size_t j = (i + console_log->cursor) % console_log->capacity;
  77         if (console_log->buffer[j]) {
  78             if (sprite_font_render_text(console_log->font,
  79                                         renderer,
  80                                         vec_sum(position,
  81                                                 vec(0.0f, FONT_CHAR_HEIGHT * console_log->font_size.y * (float) i)),
  82                                         console_log->font_size,
  83                                         console_log->colors[j],
  84                                         console_log->buffer[j]) < 0) {
  85                 return -1;
  86             }
  87         }
  88     }
  89
  90     return 0;
  91 }
  92
  93 int console_log_push_line(Console_Log *console_log, const char *line, Color color)
  94 {
  95     trace_assert(console_log);
  96     trace_assert(line);
  97
  98     const size_t next_cursor = (console_log->cursor + 1) % console_log->capacity;
  99
 100     if (console_log->buffer[console_log->cursor] != NULL) {
 101         free(console_log->buffer[console_log->cursor]);
 102     }
 103
 104     console_log->buffer[console_log->cursor] = string_duplicate(line, NULL);
 105     console_log->colors[console_log->cursor] = color;
 106
 107     if (console_log->buffer[console_log->cursor] == NULL) {
 108         return -1;
 109     }
 110
 111     console_log->cursor = next_cursor;
 112
 113     return 0;
 114 }