Function UpdateCursorSize

src/gfx.cpp:1618–1649

* Update cursor dimension. * Called when changing cursor sprite resp. reloading grfs. */

 * Called when changing cursor sprite resp. reloading grfs.
 */
void UpdateCursorSize()
{
	/* Ignore setting any cursor before the sprites are loaded. */
	if (GetMaxSpriteID() == 0) return;

	bool first = true;
	for (const auto &cs : _cursor.sprites) {
		const Sprite *p = GetSprite(GB(cs.image.sprite, 0, SPRITE_WIDTH), SpriteType::Normal);
		Point offs, size;
		offs.x = UnScaleGUI(p->x_offs) + cs.pos.x;
		offs.y = UnScaleGUI(p->y_offs) + cs.pos.y;
		size.x = UnScaleGUI(p->width);
		size.y = UnScaleGUI(p->height);

		if (first) {
			/* First sprite sets the total. */
			_cursor.total_offs = offs;
			_cursor.total_size = size;
			first = false;
		} else {
			/* Additional sprites expand the total. */
			int right  = std::max(_cursor.total_offs.x + _cursor.total_size.x, offs.x + size.x);
			int bottom = std::max(_cursor.total_offs.y + _cursor.total_size.y, offs.y + size.y);
			if (offs.x < _cursor.total_offs.x) _cursor.total_offs.x = offs.x;
			if (offs.y < _cursor.total_offs.y) _cursor.total_offs.y = offs.y;
			_cursor.total_size.x = right  - _cursor.total_offs.x;
			_cursor.total_size.y = bottom - _cursor.total_offs.y;
		}
	}

	_cursor.dirty = true;
}

/**
 * Switch cursor to different sprite.