354 lines
8.2 KiB
C++
354 lines
8.2 KiB
C++
/*
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* \brief Implementation of Framebuffer and Input services
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* \author Norman Feske
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* \date 2006-09-22
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*/
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/*
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* Copyright (C) 2006-2013 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 General Public License version 2.
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*/
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#include <base/env.h>
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#include <base/semaphore.h>
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#include <base/rpc_server.h>
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#include <framebuffer_session/framebuffer_session.h>
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#include <input/component.h>
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#include <nitpicker_gfx/texture_painter.h>
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#include <os/pixel_rgb565.h>
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#include "services.h"
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typedef Genode::Texture<Genode::Pixel_rgb565> Texture_rgb565;
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/*****************
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** Event queue **
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*****************/
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class Event_queue
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{
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private:
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enum { QUEUE_SIZE = 1024 };
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Input::Event _queue[QUEUE_SIZE];
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int _head;
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int _tail;
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Genode::Semaphore _sem;
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public:
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/**
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* Constructor
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*/
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Event_queue(): _head(0), _tail(0)
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{
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Scout::memset(_queue, 0, sizeof(_queue));
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}
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void post(Input::Event ev)
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{
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if ((_head + 1)%QUEUE_SIZE != _tail) {
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_queue[_head] = ev;
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_head = (_head + 1)%QUEUE_SIZE;
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_sem.up();
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}
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}
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Input::Event get()
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{
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_sem.down();
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Input::Event dst_ev = _queue[_tail];
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_tail = (_tail + 1)%QUEUE_SIZE;
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return dst_ev;
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}
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int pending() { return _head != _tail; }
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} _ev_queue;
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/***************************
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** Input service backend **
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***************************/
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namespace Input {
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void event_handling(bool enable) { }
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bool event_pending() { return _ev_queue.pending(); }
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Event get_event() { return _ev_queue.get(); }
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}
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class Window_content : public Scout::Element
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{
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private:
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class Content_event_handler : public Scout::Event_handler
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{
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private:
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Event_queue *_ev_queue;
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Scout::Point _old_mouse_position;
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Element *_element;
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public:
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Content_event_handler(Event_queue *ev_queue,
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Scout::Element *element)
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:
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_ev_queue(ev_queue), _element(element) { }
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void handle(Scout::Event &ev)
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{
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using namespace Scout;
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Point mouse_position = ev.mouse_position - _element->abs_position();
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int code = 0;
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if (ev.type == Event::PRESS || ev.type == Event::RELEASE)
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code = ev.code;
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Input::Event::Type type;
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type = (ev.type == Event::MOTION) ? Input::Event::MOTION
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: (ev.type == Event::PRESS) ? Input::Event::PRESS
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: (ev.type == Event::RELEASE) ? Input::Event::RELEASE
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: Input::Event::INVALID;
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if (type != Input::Event::INVALID)
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_ev_queue->post(Input::Event(type, code, mouse_position.x(),
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mouse_position.y(),
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mouse_position.x() - _old_mouse_position.x(),
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mouse_position.y() - _old_mouse_position.y()));
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_old_mouse_position = mouse_position;
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}
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};
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struct Fb_texture
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{
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unsigned w, h;
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Genode::Attached_ram_dataspace ds;
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Genode::Pixel_rgb565 *pixel;
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unsigned char *alpha;
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Genode::Texture<Genode::Pixel_rgb565> texture;
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Fb_texture(unsigned w, unsigned h, bool config_alpha)
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:
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w(w), h(h),
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ds(Genode::env()->ram_session(), w*h*sizeof(Genode::Pixel_rgb565)),
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pixel(ds.local_addr<Genode::Pixel_rgb565>()),
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alpha((unsigned char *)Genode::env()->heap()->alloc(w*h)),
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texture(pixel, alpha, Scout::Area(w, h))
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{
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int alpha_min = config_alpha ? 0 : 255;
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/* init alpha channel */
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for (unsigned y = 0; y < h; y++)
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for (unsigned x = 0; x < w; x++) {
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int v = (x * y + (w*h)/4) / w;
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v = v + (x + y)/2;
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int a = v & 0xff;
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if (v & 0x100)
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a = 255 - a;
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a += (Genode::Dither_matrix::value(x, y) - 127) >> 4;
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alpha[y*w + x] = Genode::max(alpha_min, Genode::min(a, 255));
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}
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}
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~Fb_texture()
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{
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Genode::env()->heap()->free(alpha, w*h);
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}
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};
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bool _config_alpha;
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Content_event_handler _ev_handler;
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Fb_texture *_fb;
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/**
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* Size of the framebuffer handed out by the next call of 'dataspace'
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*/
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Scout::Area _next_size;
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/**
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* Most current designated size of the framebuffer as defined by the
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* user.
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*
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* The '_designated_size' may be updated any time when the user drags
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* the resize handle of the window. It is propagated to '_next_size'
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* not before the framebuffer client requests the current mode. Once
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* the mode information is passed to the client, it is locked until
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* the client requests the mode again.
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*/
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Scout::Area _designated_size;
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Genode::Signal_context_capability _mode_sigh;
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public:
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Window_content(unsigned fb_w, unsigned fb_h, Event_queue *ev_queue,
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bool config_alpha)
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:
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_config_alpha(config_alpha),
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_ev_handler(ev_queue, this),
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_fb(new (Genode::env()->heap()) Fb_texture(fb_w, fb_h, _config_alpha)),
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_next_size(fb_w, fb_h),
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_designated_size(_next_size)
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{
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_min_size = Scout::Area(_fb->w, _fb->h);
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event_handler(&_ev_handler);
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}
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Genode::Dataspace_capability fb_ds_cap() { return _fb->ds.cap(); }
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unsigned fb_w() { return _fb->w; }
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unsigned fb_h() { return _fb->h; }
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Scout::Area mode_size()
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{
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_next_size = _designated_size;
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return _next_size;
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}
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void mode_sigh(Genode::Signal_context_capability sigh)
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{
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_mode_sigh = sigh;
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}
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void realloc_framebuffer()
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{
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/* skip reallocation if size has not changed */
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if (_next_size.w() == _fb->w && _next_size.h() == _fb->h)
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return;
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Genode::destroy(Genode::env()->heap(), _fb);
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_fb = new (Genode::env()->heap())
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Fb_texture(_next_size.w(), _next_size.h(), _config_alpha);
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}
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/**
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* Element interface
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*/
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void draw(Scout::Canvas_base &canvas, Scout::Point abs_position)
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{
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canvas.draw_texture(abs_position + _position, _fb->texture);
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}
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void format_fixed_size(Scout::Area size)
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{
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_designated_size = size;
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/* notify framebuffer client about mode change */
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if (_mode_sigh.valid())
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Genode::Signal_transmitter(_mode_sigh).submit();
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}
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};
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static Window_content *_window_content;
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Scout::Element *window_content() { return _window_content; }
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/***********************************************
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** Implementation of the framebuffer service **
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***********************************************/
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namespace Framebuffer
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{
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class Session_component : public Genode::Rpc_object<Session>
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{
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private:
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Window_content &_window_content;
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public:
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Session_component(Window_content &window_content)
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: _window_content(window_content) { }
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Genode::Dataspace_capability dataspace()
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{
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_window_content.realloc_framebuffer();
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return _window_content.fb_ds_cap();
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}
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Mode mode() const
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{
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return Mode(_window_content.mode_size().w(),
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_window_content.mode_size().h(), Mode::RGB565);
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}
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void mode_sigh(Genode::Signal_context_capability sigh) {
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_window_content.mode_sigh(sigh); }
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void refresh(int x, int y, int w, int h)
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{
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_window_content.redraw_area(x, y, w, h);
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}
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};
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class Root : public Genode::Root_component<Session_component>
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{
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private:
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Window_content &_window_content;
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protected:
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Session_component *_create_session(const char *args) {
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return new (md_alloc()) Session_component(_window_content); }
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public:
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Root(Genode::Rpc_entrypoint *session_ep,
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Genode::Allocator *md_alloc,
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Window_content &window_content)
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:
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Genode::Root_component<Session_component>(session_ep, md_alloc),
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_window_content(window_content)
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{ }
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};
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}
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void init_window_content(unsigned fb_w, unsigned fb_h, bool config_alpha)
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{
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static Window_content content(fb_w, fb_h, &_ev_queue, config_alpha);
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_window_content = &content;
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}
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void init_services(Genode::Rpc_entrypoint &ep)
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{
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using namespace Genode;
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/*
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* Let the entry point serve the framebuffer and input root interfaces
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*/
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static Framebuffer::Root fb_root(&ep, env()->heap(), *_window_content);
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static Input::Root input_root(&ep, env()->heap());
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/*
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* Now, the root interfaces are ready to accept requests.
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* This is the right time to tell mummy about our services.
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*/
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env()->parent()->announce(ep.manage(&fb_root));
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env()->parent()->announce(ep.manage(&input_root));
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}
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