/*
 * \brief  Frame-buffer driver for the i.MX53
 * \author Nikolay Golikov <nik@ksyslabs.org>
 * \author Stefan Kalkowski <stefan.kalkowski@genode-labs.com>
 * \date   2012-06-21
 */

/* Genode includes */
#include <imx_framebuffer_session/imx_framebuffer_session.h>
#include <cap_session/connection.h>
#include <dataspace/client.h>
#include <base/printf.h>
#include <base/sleep.h>
#include <os/static_root.h>
#include <os/config.h>
#include <blit/blit.h>

/* local includes */
#include <driver.h>

namespace Framebuffer {
	using namespace Genode;
	class Session_component;
};


class Framebuffer::Session_component :
	public Genode::Rpc_object<Framebuffer::Imx_session>
{
	private:

		bool     _buffered;
		Mode     _mode;
		size_t   _size;

		/* dataspace uses a back buffer (if '_buffered' is true) */
		Genode::Dataspace_capability _bb_ds;
		void                        *_bb_addr;

		/* dataspace of physical frame buffer */
		Genode::Dataspace_capability _fb_ds;
		void                        *_fb_addr;

		Ipu &_ipu;

	public:

		Session_component(Driver &driver, bool buffered)
		: _buffered(buffered),
		  _mode(driver.mode()),
		  _size(_mode.bytes_per_pixel() * _mode.width() * _mode.height()),
		  _bb_ds(buffered ? Genode::env()->ram_session()->alloc(_size)
		                  : Genode::Ram_dataspace_capability()),
		  _bb_addr(buffered ? (void*)Genode::env()->rm_session()->attach(_bb_ds) : 0),
		  _fb_ds(Genode::env()->ram_session()->alloc(_size, false)),
		  _fb_addr((void*)Genode::env()->rm_session()->attach(_fb_ds)),
		  _ipu(driver.ipu())
		{
			if (!driver.init(Dataspace_client(_fb_ds).phys_addr())) {
				PERR("Could not initialize display");
				struct Could_not_initialize_display : Exception { };
				throw Could_not_initialize_display();
			}
		}


		/**************************************
		 **  Framebuffer::session interface  **
		 **************************************/

		Dataspace_capability dataspace() { return _buffered ? _bb_ds : _fb_ds; }
		Mode mode() const                { return _mode; }
		void mode_sigh(Genode::Signal_context_capability) { }

		void refresh(int x, int y, int w, int h)
		{
			if (!_buffered) return;

			/* clip specified coordinates against screen boundaries */
			int x2 = min(x + w - 1, (int)_mode.width()  - 1),
				y2 = min(y + h - 1, (int)_mode.height() - 1);
			int x1 = max(x, 0),
				y1 = max(y, 0);
			if (x1 > x2 || y1 > y2) return;

			int bypp = _mode.bytes_per_pixel();

			/* copy pixels from back buffer to physical frame buffer */
			char *src = (char *)_bb_addr + bypp*(_mode.width()*y + x),
			     *dst = (char *)_fb_addr + bypp*(_mode.width()*y + x);

			blit(src, bypp*_mode.width(), dst, bypp*_mode.width(),
				 bypp*(x2 - x1 + 1), y2 - y1 + 1);
		}

		void overlay(Genode::addr_t phys_base, int x, int y, int alpha) {
			_ipu.overlay(phys_base, x, y, alpha); }
};


static bool config_attribute(const char *attr_name)
{
	bool result = false;
	try {
		result =
			Genode::config()->xml_node().attribute(attr_name).has_value("yes"); }
	catch (...) {}
	return result;
}


int main(int, char **)
{
	Genode::printf("Starting i.MX53 framebuffer driver\n");

	using namespace Framebuffer;

	static Driver driver;

	enum { STACK_SIZE = 4096 };
	static Cap_connection cap;
	static Rpc_entrypoint ep(&cap, STACK_SIZE, "fb_ep");

	static Session_component fb_session(driver, config_attribute("buffered"));
	static Static_root<Framebuffer::Session> fb_root(ep.manage(&fb_session));

	env()->parent()->announce(ep.manage(&fb_root));

	sleep_forever();
	return 0;
}