17c79a9e23
Besides adapting the components to the use of base/log.h, the patch cleans up a few base headers, i.e., it removes unused includes from root/component.h, specifically base/heap.h and ram_session/ram_session.h. Hence, components that relied on the implicit inclusion of those headers have to manually include those headers now. While adjusting the log messages, I repeatedly stumbled over the problem that printing char * arguments is ambiguous. It is unclear whether to print the argument as pointer or null-terminated string. To overcome this problem, the patch introduces a new type 'Cstring' that allows the caller to express that the argument should be handled as null-terminated string. As a nice side effect, with this type in place, the optional len argument of the 'String' class could be removed. Instead of supplying a pair of (char const *, size_t), the constructor accepts a 'Cstring'. This, in turn, clears the way let the 'String' constructor use the new output mechanism to assemble a string from multiple arguments (and thereby getting rid of snprintf within Genode in the near future). To enforce the explicit resolution of the char * ambiguity, the 'char *' overload of the 'print' function is marked as deleted. Issue #1987
141 lines
3.7 KiB
C++
141 lines
3.7 KiB
C++
/*
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* \brief Frame-buffer driver for the i.MX53
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* \author Nikolay Golikov <nik@ksyslabs.org>
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* \author Stefan Kalkowski <stefan.kalkowski@genode-labs.com>
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* \date 2012-06-21
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*/
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/* Genode includes */
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#include <imx_framebuffer_session/imx_framebuffer_session.h>
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#include <cap_session/connection.h>
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#include <timer_session/connection.h>
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#include <dataspace/client.h>
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#include <base/log.h>
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#include <base/sleep.h>
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#include <os/static_root.h>
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#include <os/config.h>
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#include <blit/blit.h>
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/* local includes */
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#include <driver.h>
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namespace Framebuffer {
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using namespace Genode;
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class Session_component;
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};
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class Framebuffer::Session_component :
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public Genode::Rpc_object<Framebuffer::Imx_session>
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{
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private:
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bool _buffered;
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Mode _mode;
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size_t _size;
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/* dataspace uses a back buffer (if '_buffered' is true) */
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Genode::Dataspace_capability _bb_ds;
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void *_bb_addr;
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/* dataspace of physical frame buffer */
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Genode::Dataspace_capability _fb_ds;
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void *_fb_addr;
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Timer::Connection _timer;
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Ipu &_ipu;
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void _refresh_buffered(int x, int y, int w, int h)
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{
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/* clip specified coordinates against screen boundaries */
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int x2 = min(x + w - 1, (int)_mode.width() - 1),
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y2 = min(y + h - 1, (int)_mode.height() - 1);
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int x1 = max(x, 0),
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y1 = max(y, 0);
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if (x1 > x2 || y1 > y2) return;
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int bypp = _mode.bytes_per_pixel();
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/* copy pixels from back buffer to physical frame buffer */
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char *src = (char *)_bb_addr + bypp*(_mode.width()*y1 + x1),
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*dst = (char *)_fb_addr + bypp*(_mode.width()*y1 + x1);
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blit(src, bypp*_mode.width(), dst, bypp*_mode.width(),
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bypp*(x2 - x1 + 1), y2 - y1 + 1);
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}
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public:
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Session_component(Driver &driver, bool buffered)
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: _buffered(buffered),
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_mode(driver.mode()),
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_size(_mode.bytes_per_pixel() * _mode.width() * _mode.height()),
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_bb_ds(buffered ? Genode::env()->ram_session()->alloc(_size)
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: Genode::Ram_dataspace_capability()),
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_bb_addr(buffered ? (void*)Genode::env()->rm_session()->attach(_bb_ds) : 0),
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_fb_ds(Genode::env()->ram_session()->alloc(_size, WRITE_COMBINED)),
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_fb_addr((void*)Genode::env()->rm_session()->attach(_fb_ds)),
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_ipu(driver.ipu())
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{
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if (!driver.init(Dataspace_client(_fb_ds).phys_addr())) {
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error("could not initialize display");
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struct Could_not_initialize_display : Exception { };
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throw Could_not_initialize_display();
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}
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}
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/**************************************
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** Framebuffer::session interface **
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**************************************/
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Dataspace_capability dataspace() override { return _buffered ? _bb_ds : _fb_ds; }
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Mode mode() const override { return _mode; }
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void mode_sigh(Genode::Signal_context_capability) override { }
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void sync_sigh(Genode::Signal_context_capability sigh) override
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{
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_timer.sigh(sigh);
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_timer.trigger_periodic(10*1000);
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}
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void refresh(int x, int y, int w, int h) override
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{
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if (_buffered)
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_refresh_buffered(x, y, w, h);
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}
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void overlay(Genode::addr_t phys_base, int x, int y, int alpha) {
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_ipu.overlay(phys_base, x, y, alpha); }
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};
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static bool config_attribute(const char *attr_name)
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{
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return Genode::config()->xml_node().attribute_value(attr_name, false);
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}
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int main(int, char **)
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{
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Genode::log("--- i.MX53 framebuffer driver ---");
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using namespace Framebuffer;
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static Driver driver;
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enum { STACK_SIZE = 4096 };
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static Cap_connection cap;
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static Rpc_entrypoint ep(&cap, STACK_SIZE, "fb_ep");
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static Session_component fb_session(driver, config_attribute("buffered"));
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static Static_root<Framebuffer::Session> fb_root(ep.manage(&fb_session));
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env()->parent()->announce(ep.manage(&fb_root));
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sleep_forever();
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return 0;
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}
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