genode/repos/os/src/app/pointer/main.cc

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/*
* \brief Minimalistic nitpicker pointer
* \author Norman Feske
* \date 2014-07-02
*/
/*
* Copyright (C) 2014 Genode Labs GmbH
*
* This file is part of the Genode OS framework, which is distributed
* under the terms of the GNU General Public License version 2.
*/
/* Genode includes */
#include <nitpicker_session/connection.h>
#include <os/surface.h>
#include <os/pixel_rgb565.h>
#include <os/attached_dataspace.h>
#include <base/sleep.h>
/* local includes */
#include "big_mouse.h"
template <typename PT>
void convert_cursor_data_to_pixels(PT *pixel, Nitpicker::Area size)
{
unsigned char *alpha = (unsigned char *)(pixel + size.count());
for (unsigned y = 0; y < size.h(); y++) {
for (unsigned x = 0; x < size.w(); x++) {
/* the source is known to be in RGB565 format */
Genode::Pixel_rgb565 src =
*(Genode::Pixel_rgb565 *)(&big_mouse.pixels[y][x]);
unsigned const i = y*size.w() + x;
pixel[i] = PT(src.r(), src.g(), src.b());
alpha[i] = src.r() ? 255 : 0;
}
}
}
int main(int, char **)
{
static Nitpicker::Connection nitpicker;
Nitpicker::Area const cursor_size(big_mouse.w, big_mouse.h);
Framebuffer::Mode const mode(cursor_size.w(), cursor_size.h(),
Framebuffer::Mode::RGB565);
nitpicker.buffer(mode, true);
static Genode::Attached_dataspace ds(nitpicker.framebuffer()->dataspace());
convert_cursor_data_to_pixels(ds.local_addr<Genode::Pixel_rgb565>(), cursor_size);
Nitpicker::Session::View_handle view = nitpicker.create_view();
Nitpicker::Rect geometry(Nitpicker::Point(0, 0), cursor_size);
nitpicker.enqueue<Nitpicker::Session::Command::Geometry>(view, geometry);
nitpicker.enqueue<Nitpicker::Session::Command::To_front>(view);
nitpicker.execute();
Genode::sleep_forever();
}