src/object/display_effect.cpp

   1 #include <config.h>
   2 #include "display_effect.hpp"
   3
   4 #include <assert.h>
   5 #include "video/drawing_context.hpp"
   6 #include "main.hpp"
   7
   8 DisplayEffect::DisplayEffect()
   9     : type(NO_FADE), fadetime(0), fading(0), black(false)
  10 {
  11   cutscene_borders = false;
  12 }
  13
  14 DisplayEffect::~DisplayEffect()
  15 {
  16 }
  17
  18 void
  19 DisplayEffect::update(float elapsed_time)
  20 {
  21     switch(type) {
  22         case NO_FADE:
  23             return;
  24         case FADE_IN:
  25             fading -= elapsed_time;
  26             if(fading < 0) {
  27                 type = NO_FADE;
  28             }
  29             break;
  30         case FADE_OUT:
  31             fading -= elapsed_time;
  32             if(fading < 0) {
  33                 type = NO_FADE;
  34                 black = true;
  35             }
  36             break;
  37         default:
  38             assert(false);
  39     }
  40 }
  41
  42 void
  43 DisplayEffect::draw(DrawingContext& context)
  44 {
  45     context.push_transform();
  46     context.set_translation(Vector(0, 0));
  47
  48     if(black || type != NO_FADE) {
  49       uint8_t alpha;
  50       if(black) {
  51           alpha = 255;
  52       } else {
  53           switch(type) {
  54               case FADE_IN:
  55                   alpha = static_cast<uint8_t>
  56                       (fading * 255.0 / fadetime);
  57                   break;
  58               case FADE_OUT:
  59                   alpha = static_cast<uint8_t>
  60                       ((fadetime-fading) * 255.0 / fadetime);
  61                   break;
  62               default:
  63                   alpha = 0;
  64                   assert(false);
  65           }
  66       }
  67       context.draw_filled_rect(Vector(0, 0), Vector(SCREEN_WIDTH, SCREEN_HEIGHT),
  68               Color(0, 0, 0, alpha), LAYER_GUI-10);
  69     }
  70
  71     if (cutscene_borders) {
  72       context.draw_filled_rect(Vector(0, 0), Vector(SCREEN_WIDTH, 75),
  73               Color(0, 0, 0, 255), LAYER_GUI-10);
  74       context.draw_filled_rect(Vector(0, SCREEN_HEIGHT - 75), Vector(SCREEN_WIDTH, 75),
  75               Color(0, 0, 0, 255), LAYER_GUI-10);
  76     }
  77
  78     context.pop_transform();
  79 }
  80
  81 void
  82 DisplayEffect::fade_out(float fadetime)
  83 {
  84     black = false;
  85     this->fadetime = fadetime;
  86     fading = fadetime;
  87     type = FADE_OUT;
  88 }
  89
  90 void
  91 DisplayEffect::fade_in(float fadetime)
  92 {
  93     black = false;
  94     this->fadetime = fadetime;
  95     fading = fadetime;
  96     type = FADE_IN;
  97 }
  98
  99 void
 100 DisplayEffect::set_black(bool enabled)
 101 {
 102     black = enabled;
 103 }
 104
 105 bool
 106 DisplayEffect::is_black()
 107 {
 108     return black;
 109 }
 110
 111 void
 112 DisplayEffect::sixteen_to_nine()
 113 {
 114   cutscene_borders = true;
 115 }
 116
 117 void
 118 DisplayEffect::four_to_three()
 119 {
 120   cutscene_borders = false;
 121 }