4d442bca30
This patch reduces the number of exception types by facilitating globally defined exceptions for common usage patterns shared by most services. In particular, RPC functions that demand a session-resource upgrade not longer reflect this condition via a session-specific exception but via the 'Out_of_ram' or 'Out_of_caps' types. Furthermore, the 'Parent::Service_denied', 'Parent::Unavailable', 'Root::Invalid_args', 'Root::Unavailable', 'Service::Invalid_args', 'Service::Unavailable', and 'Local_service::Factory::Denied' types have been replaced by the single 'Service_denied' exception type defined in 'session/session.h'. This consolidation eases the error handling (there are fewer exceptions to handle), alleviates the need to convert exceptions along the session-creation call chain, and avoids possible aliasing problems (catching the wrong type with the same name but living in a different scope).
331 lines
8.1 KiB
C++
331 lines
8.1 KiB
C++
/*
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* \brief Example window decorator that mimics the Motif look
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* \author Norman Feske
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* \date 2013-01-04
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*/
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/*
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* Copyright (C) 2013-2017 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU Affero General Public License version 3.
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*/
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/* Genode includes */
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#include <base/log.h>
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#include <base/component.h>
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#include <base/heap.h>
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#include <base/attached_rom_dataspace.h>
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#include <nitpicker_session/connection.h>
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#include <os/pixel_rgb565.h>
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#include <os/reporter.h>
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/* decorator includes */
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#include <decorator/window_stack.h>
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#include <decorator/xml_utils.h>
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/* local includes */
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#include "canvas.h"
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#include "window.h"
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namespace Decorator {
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using namespace Genode;
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struct Main;
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}
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struct Decorator::Main : Window_factory_base
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{
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Env &_env;
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Nitpicker::Connection _nitpicker { _env };
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Framebuffer::Mode _mode = { _nitpicker.mode() };
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Attached_dataspace _fb_ds = { _env.rm(),
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(_nitpicker.buffer(_mode, false),
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_nitpicker.framebuffer()->dataspace()) };
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Canvas<Pixel_rgb565> _canvas = { _fb_ds.local_addr<Pixel_rgb565>(),
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Area(_mode.width(), _mode.height()),
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_env.ram(), _env.rm() };
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Window_stack _window_stack = { *this };
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/**
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* Handler for responding to window-layout changes
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*/
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void _handle_window_layout_update();
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Signal_handler<Main> _window_layout_handler = {
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_env.ep(), *this, &Main::_handle_window_layout_update };
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Attached_rom_dataspace _window_layout { _env, "window_layout" };
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/**
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* Handler for responding to pointer-position updates
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*/
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void _handle_pointer_update();
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Signal_handler<Main> _pointer_handler = {
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_env.ep(), *this, &Main::_handle_pointer_update };
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Attached_rom_dataspace _pointer { _env, "pointer" };
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Window_base::Hover _hover;
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Reporter _hover_reporter = { _env, "hover" };
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bool _window_layout_update_needed = false;
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Reporter _decorator_margins_reporter = { _env, "decorator_margins" };
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Animator _animator;
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/**
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* Process the update every 'frame_period' nitpicker sync signals. The
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* 'frame_cnt' holds the counter of the nitpicker sync signals.
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*
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* A lower 'frame_period' value makes the decorations more responsive
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* but it also puts more load on the system.
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*
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* If the nitpicker sync signal fires every 10 milliseconds, a
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* 'frame_period' of 2 results in an update rate of 1000/20 = 50 frames per
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* second.
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*/
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unsigned _frame_cnt = 0;
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unsigned _frame_period = 2;
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/**
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* Install handler for responding to nitpicker sync events
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*/
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void _handle_nitpicker_sync();
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Signal_handler<Main> _nitpicker_sync_handler = {
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_env.ep(), *this, &Main::_handle_nitpicker_sync };
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Heap _heap { _env.ram(), _env.rm() };
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Attached_rom_dataspace _config { _env, "config" };
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void _handle_config();
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Signal_handler<Main> _config_handler = {
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_env.ep(), *this, &Main::_handle_config};
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Config _decorator_config { _heap, _config.xml() };
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/**
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* Constructor
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*/
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Main(Env &env) : _env(env)
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{
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_config.sigh(_config_handler);
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_handle_config();
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_window_layout.sigh(_window_layout_handler);
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_pointer.sigh(_pointer_handler);
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_nitpicker.framebuffer()->sync_sigh(_nitpicker_sync_handler);
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_hover_reporter.enabled(true);
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_decorator_margins_reporter.enabled(true);
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Genode::Reporter::Xml_generator xml(_decorator_margins_reporter, [&] ()
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{
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xml.node("floating", [&] () {
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Window::Border const border = Window::border_floating();
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xml.attribute("top", border.top);
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xml.attribute("bottom", border.bottom);
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xml.attribute("left", border.left);
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xml.attribute("right", border.right);
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});
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});
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/* import initial state */
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_handle_pointer_update();
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_handle_window_layout_update();
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}
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/**
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* Window_factory_base interface
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*/
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Window_base *create(Xml_node window_node) override
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{
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for (unsigned retry = 0 ; retry < 2; retry ++) {
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try {
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return new (_heap)
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Window(attribute(window_node, "id", 0UL), _nitpicker,
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_animator, _decorator_config);
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}
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catch (Genode::Out_of_ram) {
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Genode::log("Handle Out_of_ram of nitpicker session - upgrade by 8K");
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_nitpicker.upgrade_ram(8192);
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}
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catch (Genode::Out_of_caps) {
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Genode::log("Handle Out_of_caps of nitpicker session - upgrade by 2");
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_nitpicker.upgrade_ram(2);
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}
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}
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return nullptr;
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}
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/**
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* Window_factory_base interface
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*/
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void destroy(Window_base *window) override
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{
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Genode::destroy(_heap, static_cast<Window *>(window));
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}
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};
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void Decorator::Main::_handle_config()
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{
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_config.update();
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_decorator_config.update(_config.xml());
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/* notify all windows to consider the updated policy */
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_window_stack.for_each_window([&] (Window_base &window) {
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static_cast<Window &>(window).adapt_to_changed_config(); });
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/* trigger redraw of the window stack */
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_handle_window_layout_update();
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}
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static Decorator::Window_base::Hover
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find_hover(Genode::Xml_node pointer_node, Decorator::Window_stack &window_stack)
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{
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if (!pointer_node.has_attribute("xpos")
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|| !pointer_node.has_attribute("ypos"))
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return Decorator::Window_base::Hover();
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return window_stack.hover(Decorator::point_attribute(pointer_node));
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}
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static void update_hover_report(Genode::Xml_node pointer_node,
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Decorator::Window_stack &window_stack,
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Decorator::Window_base::Hover &hover,
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Genode::Reporter &hover_reporter)
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{
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Decorator::Window_base::Hover const new_hover =
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find_hover(pointer_node, window_stack);
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/* produce report only if hover state changed */
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if (new_hover != hover) {
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hover = new_hover;
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Genode::Reporter::Xml_generator xml(hover_reporter, [&] ()
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{
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if (hover.window_id > 0) {
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xml.node("window", [&] () {
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xml.attribute("id", hover.window_id);
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if (hover.left_sizer) xml.node("left_sizer");
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if (hover.right_sizer) xml.node("right_sizer");
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if (hover.top_sizer) xml.node("top_sizer");
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if (hover.bottom_sizer) xml.node("bottom_sizer");
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if (hover.title) xml.node("title");
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if (hover.closer) xml.node("closer");
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if (hover.minimizer) xml.node("minimizer");
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if (hover.maximizer) xml.node("maximizer");
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if (hover.unmaximizer) xml.node("unmaximizer");
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});
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}
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});
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}
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}
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void Decorator::Main::_handle_window_layout_update()
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{
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_window_layout.update();
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_window_layout_update_needed = true;
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}
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void Decorator::Main::_handle_nitpicker_sync()
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{
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if (_frame_cnt++ < _frame_period)
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return;
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_frame_cnt = 0;
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bool model_updated = false;
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if (_window_layout_update_needed && _window_layout.valid()) {
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try {
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Xml_node xml(_window_layout.local_addr<char>(),
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_window_layout.size());
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_window_stack.update_model(xml);
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model_updated = true;
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/*
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* A decorator element might have appeared or disappeared under
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* the pointer.
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*/
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if (_pointer.valid())
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update_hover_report(Xml_node(_pointer.local_addr<char>()),
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_window_stack, _hover, _hover_reporter);
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} catch (Xml_node::Invalid_syntax) {
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/*
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* An error occured with processing the XML model. Flush the
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* internal representation.
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*/
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_window_stack.flush();
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}
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_window_layout_update_needed = false;
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}
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bool const windows_animated = _window_stack.schedule_animated_windows();
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/*
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* To make the perceived animation speed independent from the setting of
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* 'frame_period', we update the animation as often as the nitpicker
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* sync signal occurs.
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*/
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for (unsigned i = 0; i < _frame_period; i++)
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_animator.animate();
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if (!model_updated && !windows_animated)
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return;
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Dirty_rect dirty = _window_stack.draw(_canvas);
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_window_stack.update_nitpicker_views();
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_nitpicker.execute();
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dirty.flush([&] (Rect const &r) {
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_nitpicker.framebuffer()->refresh(r.x1(), r.y1(), r.w(), r.h()); });
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}
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void Decorator::Main::_handle_pointer_update()
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{
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_pointer.update();
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if (_pointer.valid())
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update_hover_report(Xml_node(_pointer.local_addr<char>()),
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_window_stack, _hover, _hover_reporter);
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}
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void Component::construct(Genode::Env &env) { static Decorator::Main main(env); }
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