Function NetworkDrawChatMessage

src/network/network_chat_gui.cpp:180–245

Draw the chat message-box */

/** Draw the chat message-box */
void NetworkDrawChatMessage()
{
	Blitter *blitter = BlitterFactory::GetCurrentBlitter();
	if (!_chatmessage_dirty) return;

	const Window *w = FindWindowByClass(WC_SEND_NETWORK_MSG);
	bool show_all = (w != nullptr);

	/* First undraw if needed */
	NetworkUndrawChatMessage();

	if (_iconsole_mode == ICONSOLE_FULL) return;

	/* Check if we have anything to draw at all */
	if (!HaveChatMessages(show_all)) return;

	int x      = _chatmsg_box.x;
	int y      = _screen.height - _chatmsg_box.y - _chatmsg_box.height;
	int width  = _chatmsg_box.width;
	int height = _chatmsg_box.height;
	if (y < 0) {
		height = std::max(height + y, std::min(_chatmsg_box.height, _screen.height));
		y = 0;
	}
	if (x + width >= _screen.width) {
		width = _screen.width - x;
	}
	if (width <= 0 || height <= 0) return;

	/* Make a copy of the screen as it is before painting (for undraw) */
	uint8_t *buffer = _chatmessage_backup.Allocate(BlitterFactory::GetCurrentBlitter()->BufferSize(width, height));
	blitter->CopyToBuffer(blitter->MoveTo(_screen.dst_ptr, x, y), buffer, width, height);

	_cur_dpi = &_screen; // switch to _screen painting

	auto now = std::chrono::steady_clock::now();
	int string_height = 0;
	for (auto &cmsg : _chatmsg_list) {
		if (!show_all && cmsg.remove_time < now) continue;
		string_height += GetStringLineCount(GetString(STR_JUST_RAW_STRING, cmsg.message), width - 1) * GetCharacterHeight(FS_NORMAL) + NETWORK_CHAT_LINE_SPACING;
	}

	string_height = std::min<uint>(string_height, MAX_CHAT_MESSAGES * (GetCharacterHeight(FS_NORMAL) + NETWORK_CHAT_LINE_SPACING));

	int top = _screen.height - _chatmsg_box.y - string_height - 2;
	int bottom = _screen.height - _chatmsg_box.y - 2;
	/* Paint a half-transparent box behind the chat messages */
	GfxFillRect(_chatmsg_box.x, top - 2, _chatmsg_box.x + _chatmsg_box.width - 1, bottom,
			PALETTE_TO_TRANSPARENT, FILLRECT_RECOLOUR // black, but with some alpha for background
		);

	/* Paint the chat messages starting with the lowest at the bottom */
	int ypos = bottom - 2;

	for (auto &cmsg : _chatmsg_list) {
		if (!show_all && cmsg.remove_time < now) continue;
		ypos = DrawStringMultiLine(_chatmsg_box.x + ScaleGUITrad(3), _chatmsg_box.x + _chatmsg_box.width - 1, top, ypos, cmsg.message, cmsg.colour, SA_LEFT | SA_BOTTOM | SA_FORCE) - NETWORK_CHAT_LINE_SPACING;
		if (ypos < top) break;