tile8_source_interaction.h

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#ifndef YAZE_APP_EDITOR_OVERWORLD_TILE8_SOURCE_INTERACTION_H
#define YAZE_APP_EDITOR_OVERWORLD_TILE8_SOURCE_INTERACTION_H
 
namespace yaze {
namespace editor {
 
inline bool ComputeTile8UsageHighlight(bool source_hovered,
                                       bool right_mouse_down) {
  return source_hovered && right_mouse_down;
}
 
inline int ComputeTile8IndexFromCanvasMouse(float mouse_x, float mouse_y,
                                            int source_bitmap_width_px,
                                            int max_tile_count,
                                            float display_scale) {
  if (source_bitmap_width_px <= 0 || max_tile_count <= 0 ||
      display_scale <= 0) {
    return -1;
  }
  if (mouse_x < 0.0f || mouse_y < 0.0f) {
    return -1;
  }
 
  const int tile_x = static_cast<int>(mouse_x / (8.0f * display_scale));
  const int tile_y = static_cast<int>(mouse_y / (8.0f * display_scale));
  if (tile_x < 0 || tile_y < 0) {
    return -1;
  }
 
  const int tiles_per_row = source_bitmap_width_px / 8;
  if (tiles_per_row <= 0) {
    return -1;
  }
 
  const int tile8_id = tile_x + (tile_y * tiles_per_row);
  if (tile8_id < 0 || tile8_id >= max_tile_count) {
    return -1;
  }
  return tile8_id;
}
 
}  // namespace editor
}  // namespace yaze
 
#endif  // YAZE_APP_EDITOR_OVERWORLD_TILE8_SOURCE_INTERACTION_H