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awesome/objects/screen.c

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/*
* screen.c - screen management
*
* Copyright © 2007-2009 Julien Danjou <julien@danjou.info>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
*/
/** awesome screen API
*
* Furthermore to the classes described here, one can also use signals as
* described in @{signals}.
*
* @author Julien Danjou &lt;julien@danjou.info&gt;
* @copyright 2008-2009 Julien Danjou
* @release @AWESOME_VERSION@
* @classmod screen
*/
#include "objects/screen.h"
#include "banning.h"
#include "objects/client.h"
#include "objects/drawin.h"
#include <stdio.h>
#include <xcb/xcb.h>
#include <xcb/xinerama.h>
#include <xcb/randr.h>
/** Screen is a table where indexes are screen numbers. You can use `screen[1]`
* to get access to the first screen, etc. Alternatively, if RANDR information
* is available, you can use output names for finding screen objects.
* The primary screen can be accessed as `screen.primary`.
* Each screen has a set of properties.
*
* @tfield table geometry The screen coordinates. Immutable.
* @tfield table workarea The screen workarea.
* @tfield int index The screen number.
* @tfield table outputs If RANDR information is available, a list of outputs
* for this screen and their size in mm.
* @table screen
*/
/** Get the number of instances.
*
* @return The number of screen objects alive.
* @function instances
*/
/** Set a __index metamethod for all screen instances.
* @tparam function cb The meta-method
* @function set_index_miss_handler
*/
/** Set a __newindex metamethod for all screen instances.
* @tparam function cb The meta-method
* @function set_newindex_miss_handler
*/
struct screen_output_t
{
/** The XRandR names of the output */
char *name;
/** The size in millimeters */
uint32_t mm_width, mm_height;
/** The XID */
xcb_randr_output_t output;
};
static void
screen_output_wipe(screen_output_t *output)
{
p_delete(&output->name);
}
ARRAY_FUNCS(screen_output_t, screen_output, screen_output_wipe)
static lua_class_t screen_class;
LUA_OBJECT_FUNCS(screen_class, screen_t, screen)
/** Collect a screen. */
static void
screen_wipe(screen_t *s)
{
screen_output_array_wipe(&s->outputs);
}
/** Get a screen argument from the lua stack */
screen_t *
luaA_checkscreen(lua_State *L, int sidx)
{
if (lua_isnumber(L, sidx))
{
int screen = lua_tointeger(L, sidx);
if(screen < 1 || screen > globalconf.screens.len)
luaL_error(L, "invalid screen number: %d", screen);
return globalconf.screens.tab[screen - 1];
} else
return luaA_checkudata(L, sidx, &screen_class);
}
static inline area_t
screen_xsitoarea(xcb_xinerama_screen_info_t si)
{
area_t a =
{
.x = si.x_org,
.y = si.y_org,
.width = si.width,
.height = si.height
};
return a;
}
static void
screen_add(lua_State *L, int sidx)
{
screen_t *new_screen = luaA_checkudata(L, sidx, &screen_class);
foreach(screen_to_test, globalconf.screens)
if(new_screen->geometry.x == (*screen_to_test)->geometry.x
&& new_screen->geometry.y == (*screen_to_test)->geometry.y)
{
/* we already have a screen for this area, just check if
* it's not bigger and drop it */
(*screen_to_test)->geometry.width =
MAX(new_screen->geometry.width, (*screen_to_test)->geometry.width);
(*screen_to_test)->geometry.height =
MAX(new_screen->geometry.height, (*screen_to_test)->geometry.height);
lua_remove(L, sidx);
return;
}
sidx = luaA_absindex(L, sidx);
lua_pushvalue(L, sidx);
luaA_object_ref(L, sidx);
screen_array_append(&globalconf.screens, new_screen);
luaA_object_emit_signal(L, -1, "added", 0);
lua_pop(L, 1);
}
static bool
screens_exist(void)
{
return globalconf.screens.len > 0;
}
static bool
screen_scan_randr(void)
{
/* Check for extension before checking for XRandR */
if(xcb_get_extension_data(globalconf.connection, &xcb_randr_id)->present)
{
xcb_randr_query_version_reply_t *version_reply =
xcb_randr_query_version_reply(globalconf.connection,
xcb_randr_query_version(globalconf.connection, 1, 3), 0);
if(version_reply)
{
uint32_t major_version = version_reply->major_version;
uint32_t minor_version = version_reply->minor_version;
p_delete(&version_reply);
/* Do we agree on a supported version? */
if (major_version != 1 || minor_version < 2)
return false;
globalconf.have_randr_13 = minor_version >= 3;
/* A quick XRandR recall:
* You have CRTC that manages a part of a SCREEN.
* Each CRTC can draw stuff on one or more OUTPUT. */
xcb_randr_get_screen_resources_cookie_t screen_res_c = xcb_randr_get_screen_resources(globalconf.connection, globalconf.screen->root);
xcb_randr_get_screen_resources_reply_t *screen_res_r = xcb_randr_get_screen_resources_reply(globalconf.connection, screen_res_c, NULL);
/* Only use the data from XRandR if there is more than one screen
* defined. This should work around the broken nvidia driver. */
if (screen_res_r->num_crtcs <= 1)
{
p_delete(&screen_res_r);
return false;
}
/* We go through CRTC, and build a screen for each one. */
xcb_randr_crtc_t *randr_crtcs = xcb_randr_get_screen_resources_crtcs(screen_res_r);
for(int i = 0; i < screen_res_r->num_crtcs; i++)
{
lua_State *L = globalconf_get_lua_State();
/* Get info on the output crtc */
xcb_randr_get_crtc_info_cookie_t crtc_info_c = xcb_randr_get_crtc_info(globalconf.connection, randr_crtcs[i], XCB_CURRENT_TIME);
xcb_randr_get_crtc_info_reply_t *crtc_info_r = xcb_randr_get_crtc_info_reply(globalconf.connection, crtc_info_c, NULL);
/* If CRTC has no OUTPUT, ignore it */
if(!xcb_randr_get_crtc_info_outputs_length(crtc_info_r))
continue;
/* Prepare the new screen */
screen_t *new_screen = screen_new(L);
new_screen->geometry.x = crtc_info_r->x;
new_screen->geometry.y = crtc_info_r->y;
new_screen->geometry.width= crtc_info_r->width;
new_screen->geometry.height= crtc_info_r->height;
xcb_randr_output_t *randr_outputs = xcb_randr_get_crtc_info_outputs(crtc_info_r);
for(int j = 0; j < xcb_randr_get_crtc_info_outputs_length(crtc_info_r); j++)
{
xcb_randr_get_output_info_cookie_t output_info_c = xcb_randr_get_output_info(globalconf.connection, randr_outputs[j], XCB_CURRENT_TIME);
xcb_randr_get_output_info_reply_t *output_info_r = xcb_randr_get_output_info_reply(globalconf.connection, output_info_c, NULL);
int len = xcb_randr_get_output_info_name_length(output_info_r);
/* name is not NULL terminated */
char *name = memcpy(p_new(char *, len + 1), xcb_randr_get_output_info_name(output_info_r), len);
name[len] = '\0';
screen_output_array_append(&new_screen->outputs,
(screen_output_t) { .name = name,
.mm_width = output_info_r->mm_width,
.mm_height = output_info_r->mm_height,
.output = randr_outputs[j] });
p_delete(&output_info_r);
}
screen_add(L, -1);
p_delete(&crtc_info_r);
}
p_delete(&screen_res_r);
screen_update_primary();
return screens_exist();
}
}
return false;
}
static bool
screen_scan_xinerama(void)
{
bool xinerama_is_active = false;
/* Check for extension before checking for Xinerama */
if(xcb_get_extension_data(globalconf.connection, &xcb_xinerama_id)->present)
{
xcb_xinerama_is_active_reply_t *xia;
xia = xcb_xinerama_is_active_reply(globalconf.connection, xcb_xinerama_is_active(globalconf.connection), NULL);
xinerama_is_active = xia->state;
p_delete(&xia);
}
if(xinerama_is_active)
{
xcb_xinerama_query_screens_reply_t *xsq;
xcb_xinerama_screen_info_t *xsi;
int xinerama_screen_number;
xsq = xcb_xinerama_query_screens_reply(globalconf.connection,
xcb_xinerama_query_screens_unchecked(globalconf.connection),
NULL);
xsi = xcb_xinerama_query_screens_screen_info(xsq);
xinerama_screen_number = xcb_xinerama_query_screens_screen_info_length(xsq);
/* now check if screens overlaps (same x,y): if so, we take only the biggest one */
for(int screen = 0; screen < xinerama_screen_number; screen++)
{
lua_State *L = globalconf_get_lua_State();
screen_t *s = screen_new(L);
s->geometry = screen_xsitoarea(xsi[screen]);
screen_add(L, -1);
}
p_delete(&xsq);
return screens_exist();
}
return false;
}
static void screen_scan_x11(void)
{
lua_State *L = globalconf_get_lua_State();
xcb_screen_t *xcb_screen = globalconf.screen;
screen_t *s = screen_new(L);
s->geometry.x = 0;
s->geometry.y = 0;
s->geometry.width = xcb_screen->width_in_pixels;
s->geometry.height = xcb_screen->height_in_pixels;
screen_add(L, -1);
}
/** Get screens informations and fill global configuration.
*/
void
screen_scan(void)
{
if(!screen_scan_randr() && !screen_scan_xinerama())
screen_scan_x11();
}
/** Return the squared distance of the given screen to the coordinates.
* \param screen The screen
* \param x X coordinate
* \param y Y coordinate
* \return Squared distance of the point to the screen.
*/
static unsigned int
screen_get_distance_squared(screen_t *s, int x, int y)
{
int sx = s->geometry.x, sy = s->geometry.y;
int sheight = s->geometry.height, swidth = s->geometry.width;
unsigned int dist_x, dist_y;
/* Calculate distance in X coordinate */
if (x < sx)
dist_x = sx - x;
else if (x < sx + swidth)
dist_x = 0;
else
dist_x = x - sx - swidth;
/* Calculate distance in Y coordinate */
if (y < sy)
dist_y = sy - y;
else if (y < sy + sheight)
dist_y = 0;
else
dist_y = y - sy - sheight;
return dist_x * dist_x + dist_y * dist_y;
}
/** Return the first screen number where the coordinates belong to.
* \param x X coordinate
* \param y Y coordinate
* \return Screen pointer or screen param if no match or no multi-head.
*/
screen_t *
screen_getbycoord(int x, int y)
{
foreach(s, globalconf.screens)
if(screen_coord_in_screen(*s, x, y))
return *s;
/* No screen found, find nearest screen. */
screen_t *nearest_screen = globalconf.screens.tab[0];
unsigned int nearest_dist = UINT_MAX;
foreach(s, globalconf.screens)
{
unsigned int dist_sq = screen_get_distance_squared(*s, x, y);
if(dist_sq < nearest_dist)
{
nearest_dist = dist_sq;
nearest_screen = *s;
}
}
return nearest_screen;
}
/** Are the given coordinates in a given screen?
* \param screen The logical screen number.
* \param x X coordinate
* \param y Y coordinate
* \return True if the X/Y coordinates are in the given screen.
*/
bool
screen_coord_in_screen(screen_t *s, int x, int y)
{
return (x >= s->geometry.x && x < s->geometry.x + s->geometry.width)
&& (y >= s->geometry.y && y < s->geometry.y + s->geometry.height);
}
/** Get screens info.
* \param screen Screen.
* \param strut Honor windows strut.
* \return The screen area.
*/
static area_t
screen_area_get(screen_t *screen, bool strut)
{
if(!strut)
return screen->geometry;
area_t area = screen->geometry;
uint16_t top = 0, bottom = 0, left = 0, right = 0;
#define COMPUTE_STRUT(o) \
{ \
if((o)->strut.top_start_x || (o)->strut.top_end_x || (o)->strut.top) \
{ \
if((o)->strut.top) \
top = MAX(top, (o)->strut.top); \
else \
top = MAX(top, ((o)->geometry.y - area.y) + (o)->geometry.height); \
} \
if((o)->strut.bottom_start_x || (o)->strut.bottom_end_x || (o)->strut.bottom) \
{ \
if((o)->strut.bottom) \
bottom = MAX(bottom, (o)->strut.bottom); \
else \
bottom = MAX(bottom, (area.y + area.height) - (o)->geometry.y); \
} \
if((o)->strut.left_start_y || (o)->strut.left_end_y || (o)->strut.left) \
{ \
if((o)->strut.left) \
left = MAX(left, (o)->strut.left); \
else \
left = MAX(left, ((o)->geometry.x - area.x) + (o)->geometry.width); \
} \
if((o)->strut.right_start_y || (o)->strut.right_end_y || (o)->strut.right) \
{ \
if((o)->strut.right) \
right = MAX(right, (o)->strut.right); \
else \
right = MAX(right, (area.x + area.width) - (o)->geometry.x); \
} \
}
foreach(c, globalconf.clients)
if((*c)->screen == screen && client_isvisible(*c))
COMPUTE_STRUT(*c)
foreach(drawin, globalconf.drawins)
if((*drawin)->visible)
{
screen_t *d_screen =
screen_getbycoord((*drawin)->geometry.x, (*drawin)->geometry.y);
if (d_screen == screen)
COMPUTE_STRUT(*drawin)
}
#undef COMPUTE_STRUT
area.x += left;
area.y += top;
area.width -= left + right;
area.height -= top + bottom;
return area;
}
/** Get display info.
* \return The display area.
*/
area_t
display_area_get(void)
{
xcb_screen_t *s = globalconf.screen;
area_t area = { .x = 0,
.y = 0,
.width = s->width_in_pixels,
.height = s->height_in_pixels };
return area;
}
/** Move a client to a virtual screen.
* \param c The client to move.
* \param new_screen The destination screen.
* \param doresize Set to true if we also move the client to the new x and
* y of the new screen.
*/
void
screen_client_moveto(client_t *c, screen_t *new_screen, bool doresize)
{
lua_State *L = globalconf_get_lua_State();
screen_t *old_screen = c->screen;
area_t from, to;
bool had_focus = false;
if(new_screen == c->screen)
return;
if (globalconf.focus.client == c)
had_focus = true;
c->screen = new_screen;
if(!doresize)
{
luaA_object_push(L, c);
if(old_screen != NULL)
luaA_object_push(L, old_screen);
else
lua_pushnil(L);
luaA_object_emit_signal(L, -2, "property::screen", 1);
lua_pop(L, 1);
if(had_focus)
client_focus(c);
return;
}
from = screen_area_get(old_screen, false);
to = screen_area_get(c->screen, false);
area_t new_geometry = c->geometry;
new_geometry.x = to.x + new_geometry.x - from.x;
new_geometry.y = to.y + new_geometry.y - from.y;
/* resize the client if it doesn't fit the new screen */
if(new_geometry.width > to.width)
new_geometry.width = to.width;
if(new_geometry.height > to.height)
new_geometry.height = to.height;
/* make sure the client is still on the screen */
if(new_geometry.x + new_geometry.width > to.x + to.width)
new_geometry.x = to.x + to.width - new_geometry.width;
if(new_geometry.y + new_geometry.height > to.y + to.height)
new_geometry.y = to.y + to.height - new_geometry.height;
/* move / resize the client */
client_resize(c, new_geometry, false);
/* Emit signal, but only in case the call to client_resize had not changed
* it already. */
if(old_screen != c->screen)
{
luaA_object_push(L, c);
if(old_screen != NULL)
luaA_object_push(L, old_screen);
else
lua_pushnil(L);
luaA_object_emit_signal(L, -2, "property::screen", 1);
lua_pop(L, 1);
}
if(had_focus)
client_focus(c);
}
/** Get a screen's index. */
int
screen_get_index(screen_t *s)
{
int res = 0;
foreach(screen, globalconf.screens)
{
res++;
if (*screen == s)
return res;
}
return 0;
}
void
screen_update_primary(void)
{
if (!globalconf.have_randr_13)
return;
screen_t *primary_screen = NULL;
xcb_randr_get_output_primary_reply_t *primary =
xcb_randr_get_output_primary_reply(globalconf.connection,
xcb_randr_get_output_primary(globalconf.connection, globalconf.screen->root),
NULL);
if (!primary)
return;
foreach(screen, globalconf.screens)
{
foreach(output, (*screen)->outputs)
if (output->output == primary->output)
primary_screen = *screen;
}
p_delete(&primary);
if (!primary_screen || primary_screen == globalconf.primary_screen)
return;
lua_State *L = globalconf_get_lua_State();
screen_t *old = globalconf.primary_screen;
globalconf.primary_screen = primary_screen;
if (old)
{
luaA_object_push(L, old);
luaA_object_emit_signal(L, -1, "primary_changed", 0);
lua_pop(L, 1);
}
luaA_object_push(L, primary_screen);
luaA_object_emit_signal(L, -1, "primary_changed", 0);
lua_pop(L, 1);
}
screen_t *
screen_get_primary(void)
{
if (!globalconf.primary_screen && globalconf.screens.len > 0)
globalconf.primary_screen = globalconf.screens.tab[0];
return globalconf.primary_screen;
}
/** Screen module.
* \param L The Lua VM state.
* \return The number of elements pushed on stack.
* \luastack
* \lfield number The screen number, to get a screen.
*/
static int
luaA_screen_module_index(lua_State *L)
{
const char *name;
if(lua_type(L, 2) == LUA_TSTRING && (name = lua_tostring(L, 2)))
{
if(A_STREQ(name, "primary"))
return luaA_object_push(L, screen_get_primary());
foreach(screen, globalconf.screens)
foreach(output, (*screen)->outputs)
if(A_STREQ(output->name, name))
return luaA_object_push(L, *screen);
}
return luaA_object_push(L, luaA_checkscreen(L, 2));
}
/** Iterate over screens.
* @usage
* for s in screen do
* print("Oh, wow, we have screen " .. tostring(s))
* end
* @function screen
*/
static int
luaA_screen_module_call(lua_State *L)
{
int idx;
if (lua_isnoneornil(L, 3))
idx = 0;
else
idx = screen_get_index(luaA_checkscreen(L, 3));
if (idx >= 0 && idx < globalconf.screens.len)
/* No +1 needed, index starts at 1, C array at 0 */
luaA_object_push(L, globalconf.screens.tab[idx]);
else
lua_pushnil(L);
return 1;
}
LUA_OBJECT_EXPORT_PROPERTY(screen, screen_t, geometry, luaA_pusharea)
static int
luaA_screen_get_index(lua_State *L, screen_t *s)
{
lua_pushinteger(L, screen_get_index(s));
return 1;
}
static int
luaA_screen_get_outputs(lua_State *L, screen_t *s)
{
lua_createtable(L, 0, s->outputs.len);
foreach(output, s->outputs)
{
lua_createtable(L, 2, 0);
lua_pushinteger(L, output->mm_width);
lua_setfield(L, -2, "mm_width");
lua_pushinteger(L, output->mm_height);
lua_setfield(L, -2, "mm_height");
lua_setfield(L, -2, output->name);
}
/* The table of tables we created. */
return 1;
}
static int
luaA_screen_get_workarea(lua_State *L, screen_t *s)
{
luaA_pusharea(L, screen_area_get(s, true));
return 1;
}
/** Get the number of screens.
*
* @return The screen count, at least 1.
* @function count
*/
static int
luaA_screen_count(lua_State *L)
{
lua_pushinteger(L, globalconf.screens.len);
return 1;
}
void
screen_class_setup(lua_State *L)
{
static const struct luaL_Reg screen_methods[] =
{
LUA_CLASS_METHODS(screen)
{ "count", luaA_screen_count },
{ "__index", luaA_screen_module_index },
{ "__newindex", luaA_default_newindex },
{ "__call", luaA_screen_module_call },
{ NULL, NULL }
};
static const struct luaL_Reg screen_meta[] =
{
LUA_OBJECT_META(screen)
LUA_CLASS_META
{ NULL, NULL },
};
luaA_class_setup(L, &screen_class, "screen", NULL,
(lua_class_allocator_t) screen_new,
(lua_class_collector_t) screen_wipe,
NULL,
luaA_class_index_miss_property, luaA_class_newindex_miss_property,
screen_methods, screen_meta);
luaA_class_add_property(&screen_class, "geometry",
NULL,
(lua_class_propfunc_t) luaA_screen_get_geometry,
NULL);
luaA_class_add_property(&screen_class, "index",
NULL,
(lua_class_propfunc_t) luaA_screen_get_index,
NULL);
luaA_class_add_property(&screen_class, "outputs",
NULL,
(lua_class_propfunc_t) luaA_screen_get_outputs,
NULL);
luaA_class_add_property(&screen_class, "workarea",
NULL,
(lua_class_propfunc_t) luaA_screen_get_workarea,
NULL);
/**
* @signal property::workarea
*/
signal_add(&screen_class.signals, "property::workarea");
/**
* @signal primary_changed
*/
signal_add(&screen_class.signals, "primary_changed");
/**
* This signal is emitted when a new screen is added to the current setup.
* @signal added
*/
signal_add(&screen_class.signals, "added");
}
// vim: filetype=c:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:textwidth=80
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