texteff.cpp

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/*
 * This file is part of OpenTTD.
 * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
 * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
 */
 
#include "stdafx.h"
#include "texteff.hpp"
#include "transparency.h"
#include "strings_func.h"
#include "viewport_func.h"
#include "settings_type.h"
#include "command_type.h"
#include "timer/timer.h"
#include "timer/timer_window.h"
 
#include "safeguards.h"
 
struct TextEffect : public ViewportSign {
  TextEffectMode mode; 
  uint8_t duration; 
  EncodedString msg; 
 
  void Reset()
  {
    this->MarkDirty();
    this->width_normal = 0;
    this->mode = TE_INVALID;
  }
 
  inline bool IsValid() const { return this->mode != TE_INVALID; }
};
 
static std::vector<TextEffect> _text_effects; 
 
/* Text Effects */
TextEffectID AddTextEffect(EncodedString &&msg, int center, int y, uint8_t duration, TextEffectMode mode)
{
  if (_game_mode == GM_MENU) return INVALID_TE_ID;
 
  auto it = std::ranges::find_if(_text_effects, [](const TextEffect &te) { return !te.IsValid(); });
  if (it == std::end(_text_effects)) {
    /* _text_effects.size() is the maximum ID + 1 that has been allocated. We should not allocate INVALID_TE_ID or beyond. */
    if (_text_effects.size() >= INVALID_TE_ID) return INVALID_TE_ID;
    it = _text_effects.emplace(std::end(_text_effects));
  }
 
  TextEffect &te = *it;
 
  /* Start defining this object */
  te.msg = std::move(msg);
  te.duration = duration;
  te.mode = mode;
 
  /* Make sure we only dirty the new area */
  te.width_normal = 0;
  te.UpdatePosition(center, y, te.msg.GetDecodedString());
 
  return static_cast<TextEffectID>(it - std::begin(_text_effects));
}
 
void UpdateTextEffect(TextEffectID te_id, EncodedString &&msg)
{
  /* Update details */
  TextEffect &te = _text_effects[te_id];
  if (msg == te.msg) return;
  te.msg = std::move(msg);
 
  te.UpdatePosition(te.center, te.top, te.msg.GetDecodedString());
}
 
void UpdateAllTextEffectVirtCoords()
{
  for (auto &te : _text_effects) {
    if (!te.IsValid()) continue;
 
    te.UpdatePosition(te.center, te.top, te.msg.GetDecodedString());
  }
}
 
void RemoveTextEffect(TextEffectID te_id)
{
  _text_effects[te_id].Reset();
}
 
IntervalTimer<TimerWindow> move_all_text_effects_interval = {std::chrono::milliseconds(30), [](uint count) {
  if (_pause_mode.Any() && _game_mode != GM_EDITOR && _settings_game.construction.command_pause_level <= CMDPL_NO_CONSTRUCTION) return;
 
  for (TextEffect &te : _text_effects) {
    if (!te.IsValid()) continue;
    if (te.mode != TE_RISING) continue;
 
    if (te.duration < count) {
      te.Reset();
      continue;
    }
 
    te.MarkDirty(ZOOM_LVL_TEXT_EFFECT);
    te.duration -= count;
    te.top -= count * ZOOM_BASE;
    te.MarkDirty(ZOOM_LVL_TEXT_EFFECT);
  }
}};
 
void InitTextEffects()
{
  _text_effects.clear();
  _text_effects.shrink_to_fit();
}
 
void DrawTextEffects(DrawPixelInfo *dpi)
{
  /* Don't draw the text effects when zoomed out a lot */
  if (dpi->zoom > ZOOM_LVL_TEXT_EFFECT) return;
  if (IsTransparencySet(TO_TEXT)) return;
 
  ViewportStringFlags flags{};
  if (dpi->zoom >= ZOOM_LVL_TEXT_EFFECT) flags.Set(ViewportStringFlag::Small);
 
  for (const TextEffect &te : _text_effects) {
    if (!te.IsValid()) continue;
 
    if (te.mode == TE_RISING || _settings_client.gui.loading_indicators) {
      std::string *str = ViewportAddString(dpi, &te, flags, INVALID_COLOUR);
      if (str == nullptr) continue;
 
      *str = te.msg.GetDecodedString();
    }
  }
}