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picom/src/x.c

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// SPDX-License-Identifier: MPL-2.0
// Copyright (c) 2018 Yuxuan Shui <yshuiv7@gmail.com>
#include <stdbool.h>
#include <stdlib.h>
#include <X11/Xutil.h>
#include <pixman.h>
#include <xcb/composite.h>
#include <xcb/damage.h>
#include <xcb/render.h>
#include <xcb/sync.h>
#include <xcb/xcb.h>
#include <xcb/xcb_renderutil.h>
#include <xcb/xfixes.h>
#include "atom.h"
#include "backend/gl/glx.h"
#include "common.h"
#include "compiler.h"
#include "kernel.h"
#include "log.h"
#include "region.h"
#include "utils.h"
#include "x.h"
/**
* Get a specific attribute of a window.
*
* Returns a blank structure if the returned type and format does not
* match the requested type and format.
*
* @param ps current session
* @param w window
* @param atom atom of attribute to fetch
* @param length length to read
* @param rtype atom of the requested type
* @param rformat requested format
* @return a <code>winprop_t</code> structure containing the attribute
* and number of items. A blank one on failure.
*/
winprop_t wid_get_prop_adv(const session_t *ps, xcb_window_t w, xcb_atom_t atom,
int offset, int length, xcb_atom_t rtype, int rformat) {
xcb_get_property_reply_t *r = xcb_get_property_reply(
ps->c,
xcb_get_property(ps->c, 0, w, atom, rtype, to_u32_checked(offset),
to_u32_checked(length)),
NULL);
if (r && xcb_get_property_value_length(r) &&
(rtype == XCB_GET_PROPERTY_TYPE_ANY || r->type == rtype) &&
(!rformat || r->format == rformat) &&
(r->format == 8 || r->format == 16 || r->format == 32)) {
auto len = xcb_get_property_value_length(r);
return (winprop_t){
.ptr = xcb_get_property_value(r),
.nitems = (ulong)(len / (r->format / 8)),
.type = r->type,
.format = r->format,
.r = r,
};
}
free(r);
return (winprop_t){
.ptr = NULL, .nitems = 0, .type = XCB_GET_PROPERTY_TYPE_ANY, .format = 0};
}
/**
* Get the value of a type-<code>xcb_window_t</code> property of a window.
*
* @return the value if successful, 0 otherwise
*/
xcb_window_t wid_get_prop_window(session_t *ps, xcb_window_t wid, xcb_atom_t aprop) {
// Get the attribute
xcb_window_t p = XCB_NONE;
winprop_t prop = wid_get_prop(ps, wid, aprop, 1L, XCB_ATOM_WINDOW, 32);
// Return it
if (prop.nitems) {
p = (xcb_window_t)*prop.p32;
}
free_winprop(&prop);
return p;
}
/**
* Get the value of a text property of a window.
*/
bool wid_get_text_prop(session_t *ps, xcb_window_t wid, xcb_atom_t prop, char ***pstrlst,
int *pnstr) {
XTextProperty text_prop = {NULL, XCB_NONE, 0, 0};
if (!(XGetTextProperty(ps->dpy, wid, &text_prop, prop) && text_prop.value))
return false;
if (Success != XmbTextPropertyToTextList(ps->dpy, &text_prop, pstrlst, pnstr) ||
!*pnstr) {
*pnstr = 0;
if (*pstrlst)
XFreeStringList(*pstrlst);
XFree(text_prop.value);
return false;
}
XFree(text_prop.value);
return true;
}
// A cache of pict formats. We assume they don't change during the lifetime
// of compton
static thread_local xcb_render_query_pict_formats_reply_t *g_pictfmts = NULL;
static inline void x_get_server_pictfmts(xcb_connection_t *c) {
if (g_pictfmts)
return;
xcb_generic_error_t *e = NULL;
// Get window picture format
g_pictfmts =
xcb_render_query_pict_formats_reply(c, xcb_render_query_pict_formats(c), &e);
if (e || !g_pictfmts) {
log_fatal("failed to get pict formats\n");
abort();
}
}
const xcb_render_pictforminfo_t *
x_get_pictform_for_visual(xcb_connection_t *c, xcb_visualid_t visual) {
x_get_server_pictfmts(c);
xcb_render_pictvisual_t *pv = xcb_render_util_find_visual_format(g_pictfmts, visual);
for (xcb_render_pictforminfo_iterator_t i =
xcb_render_query_pict_formats_formats_iterator(g_pictfmts);
i.rem; xcb_render_pictforminfo_next(&i)) {
if (i.data->id == pv->format) {
return i.data;
}
}
return NULL;
}
static xcb_visualid_t attr_pure x_get_visual_for_pictfmt(xcb_render_query_pict_formats_reply_t *r,
xcb_render_pictformat_t fmt) {
for (auto screen = xcb_render_query_pict_formats_screens_iterator(r); screen.rem;
xcb_render_pictscreen_next(&screen)) {
for (auto depth = xcb_render_pictscreen_depths_iterator(screen.data);
depth.rem; xcb_render_pictdepth_next(&depth)) {
for (auto pv = xcb_render_pictdepth_visuals_iterator(depth.data);
pv.rem; xcb_render_pictvisual_next(&pv)) {
if (pv.data->format == fmt) {
return pv.data->visual;
}
}
}
}
return XCB_NONE;
}
xcb_visualid_t x_get_visual_for_standard(xcb_connection_t *c, xcb_pict_standard_t std) {
x_get_server_pictfmts(c);
auto pictfmt = xcb_render_util_find_standard_format(g_pictfmts, std);
return x_get_visual_for_pictfmt(g_pictfmts, pictfmt->id);
}
int x_get_visual_depth(xcb_connection_t *c, xcb_visualid_t visual) {
auto setup = xcb_get_setup(c);
for (auto screen = xcb_setup_roots_iterator(setup); screen.rem;
xcb_screen_next(&screen)) {
for (auto depth = xcb_screen_allowed_depths_iterator(screen.data);
depth.rem; xcb_depth_next(&depth)) {
const int len = xcb_depth_visuals_length(depth.data);
const xcb_visualtype_t *visuals = xcb_depth_visuals(depth.data);
for (int i = 0; i < len; i++) {
if (visual == visuals[i].visual_id) {
return depth.data->depth;
}
}
}
}
return -1;
}
xcb_render_picture_t
x_create_picture_with_pictfmt_and_pixmap(xcb_connection_t *c,
const xcb_render_pictforminfo_t *pictfmt,
xcb_pixmap_t pixmap, uint32_t valuemask,
const xcb_render_create_picture_value_list_t *attr) {
void *buf = NULL;
if (attr) {
xcb_render_create_picture_value_list_serialize(&buf, valuemask, attr);
if (!buf) {
log_error("failed to serialize picture attributes");
return XCB_NONE;
}
}
xcb_render_picture_t tmp_picture = x_new_id(c);
xcb_generic_error_t *e =
xcb_request_check(c, xcb_render_create_picture_checked(
c, tmp_picture, pixmap, pictfmt->id, valuemask, buf));
free(buf);
if (e) {
x_print_error(e->full_sequence, e->major_code, e->minor_code, e->error_code);
log_error("failed to create picture");
return XCB_NONE;
}
return tmp_picture;
}
xcb_render_picture_t
x_create_picture_with_visual_and_pixmap(xcb_connection_t *c, xcb_visualid_t visual,
xcb_pixmap_t pixmap, uint32_t valuemask,
const xcb_render_create_picture_value_list_t *attr) {
const xcb_render_pictforminfo_t *pictfmt = x_get_pictform_for_visual(c, visual);
return x_create_picture_with_pictfmt_and_pixmap(c, pictfmt, pixmap, valuemask, attr);
}
xcb_render_picture_t
x_create_picture_with_standard_and_pixmap(xcb_connection_t *c, xcb_pict_standard_t standard,
xcb_pixmap_t pixmap, uint32_t valuemask,
const xcb_render_create_picture_value_list_t *attr) {
x_get_server_pictfmts(c);
auto pictfmt = xcb_render_util_find_standard_format(g_pictfmts, standard);
assert(pictfmt);
return x_create_picture_with_pictfmt_and_pixmap(c, pictfmt, pixmap, valuemask, attr);
}
/**
* Create an picture.
*/
xcb_render_picture_t
x_create_picture_with_pictfmt(xcb_connection_t *c, xcb_drawable_t d, int w, int h,
const xcb_render_pictforminfo_t *pictfmt, uint32_t valuemask,
const xcb_render_create_picture_value_list_t *attr) {
uint8_t depth = pictfmt->depth;
xcb_pixmap_t tmp_pixmap = x_create_pixmap(c, depth, d, w, h);
if (!tmp_pixmap)
return XCB_NONE;
xcb_render_picture_t picture = x_create_picture_with_pictfmt_and_pixmap(
c, pictfmt, tmp_pixmap, valuemask, attr);
xcb_free_pixmap(c, tmp_pixmap);
return picture;
}
xcb_render_picture_t
x_create_picture_with_visual(xcb_connection_t *c, xcb_drawable_t d, int w, int h,
xcb_visualid_t visual, uint32_t valuemask,
const xcb_render_create_picture_value_list_t *attr) {
auto pictfmt = x_get_pictform_for_visual(c, visual);
return x_create_picture_with_pictfmt(c, d, w, h, pictfmt, valuemask, attr);
}
bool x_fetch_region(xcb_connection_t *c, xcb_xfixes_region_t r, pixman_region32_t *res) {
xcb_generic_error_t *e = NULL;
xcb_xfixes_fetch_region_reply_t *xr =
xcb_xfixes_fetch_region_reply(c, xcb_xfixes_fetch_region(c, r), &e);
if (!xr) {
log_error("Failed to fetch rectangles");
return false;
}
int nrect = xcb_xfixes_fetch_region_rectangles_length(xr);
auto b = ccalloc(nrect, pixman_box32_t);
xcb_rectangle_t *xrect = xcb_xfixes_fetch_region_rectangles(xr);
for (int i = 0; i < nrect; i++) {
b[i] = (pixman_box32_t){.x1 = xrect[i].x,
.y1 = xrect[i].y,
.x2 = xrect[i].x + xrect[i].width,
.y2 = xrect[i].y + xrect[i].height};
}
bool ret = pixman_region32_init_rects(res, b, nrect);
free(b);
free(xr);
return ret;
}
void x_set_picture_clip_region(xcb_connection_t *c, xcb_render_picture_t pict,
int16_t clip_x_origin, int16_t clip_y_origin,
const region_t *reg) {
int nrects;
const rect_t *rects = pixman_region32_rectangles((region_t *)reg, &nrects);
auto xrects = ccalloc(nrects, xcb_rectangle_t);
for (int i = 0; i < nrects; i++)
xrects[i] = (xcb_rectangle_t){
.x = to_i16_checked(rects[i].x1),
.y = to_i16_checked(rects[i].y1),
.width = to_u16_checked(rects[i].x2 - rects[i].x1),
.height = to_u16_checked(rects[i].y2 - rects[i].y1),
};
xcb_generic_error_t *e = xcb_request_check(
c, xcb_render_set_picture_clip_rectangles_checked(
c, pict, clip_x_origin, clip_y_origin, to_u32_checked(nrects), xrects));
if (e)
log_error("Failed to set clip region");
free(e);
free(xrects);
return;
}
void x_clear_picture_clip_region(xcb_connection_t *c, xcb_render_picture_t pict) {
xcb_render_change_picture_value_list_t v = {.clipmask = XCB_NONE};
xcb_generic_error_t *e = xcb_request_check(
c, xcb_render_change_picture(c, pict, XCB_RENDER_CP_CLIP_MASK, &v));
if (e)
log_error("failed to clear clip region");
free(e);
return;
}
enum { XSyncBadCounter = 0,
XSyncBadAlarm = 1,
XSyncBadFence = 2,
};
/**
* X11 error handler function.
*
* XXX consider making this error to string
*/
void x_print_error(unsigned long serial, uint8_t major, uint16_t minor, uint8_t error_code) {
session_t *const ps = ps_g;
int o = 0;
const char *name = "Unknown";
if (major == ps->composite_opcode && minor == XCB_COMPOSITE_REDIRECT_SUBWINDOWS) {
log_fatal("Another composite manager is already running "
"(and does not handle _NET_WM_CM_Sn correctly)");
exit(1);
}
#define CASESTRRET2(s) \
case s: name = #s; break
o = error_code - ps->xfixes_error;
switch (o) { CASESTRRET2(XCB_XFIXES_BAD_REGION); }
o = error_code - ps->damage_error;
switch (o) { CASESTRRET2(XCB_DAMAGE_BAD_DAMAGE); }
o = error_code - ps->render_error;
switch (o) {
CASESTRRET2(XCB_RENDER_PICT_FORMAT);
CASESTRRET2(XCB_RENDER_PICTURE);
CASESTRRET2(XCB_RENDER_PICT_OP);
CASESTRRET2(XCB_RENDER_GLYPH_SET);
CASESTRRET2(XCB_RENDER_GLYPH);
}
#ifdef CONFIG_OPENGL
if (ps->glx_exists) {
o = error_code - ps->glx_error;
switch (o) {
CASESTRRET2(GLX_BAD_SCREEN);
CASESTRRET2(GLX_BAD_ATTRIBUTE);
CASESTRRET2(GLX_NO_EXTENSION);
CASESTRRET2(GLX_BAD_VISUAL);
CASESTRRET2(GLX_BAD_CONTEXT);
CASESTRRET2(GLX_BAD_VALUE);
CASESTRRET2(GLX_BAD_ENUM);
}
}
#endif
if (ps->xsync_exists) {
o = error_code - ps->xsync_error;
switch (o) {
CASESTRRET2(XSyncBadCounter);
CASESTRRET2(XSyncBadAlarm);
CASESTRRET2(XSyncBadFence);
}
}
switch (error_code) {
CASESTRRET2(BadAccess);
CASESTRRET2(BadAlloc);
CASESTRRET2(BadAtom);
CASESTRRET2(BadColor);
CASESTRRET2(BadCursor);
CASESTRRET2(BadDrawable);
CASESTRRET2(BadFont);
CASESTRRET2(BadGC);
CASESTRRET2(BadIDChoice);
CASESTRRET2(BadImplementation);
CASESTRRET2(BadLength);
CASESTRRET2(BadMatch);
CASESTRRET2(BadName);
CASESTRRET2(BadPixmap);
CASESTRRET2(BadRequest);
CASESTRRET2(BadValue);
CASESTRRET2(BadWindow);
}
#undef CASESTRRET2
log_debug("X error %d %s request %d minor %d serial %lu", error_code, name, major,
minor, serial);
}
/**
* Create a pixmap and check that creation succeeded.
*/
xcb_pixmap_t x_create_pixmap(xcb_connection_t *c, uint8_t depth, xcb_drawable_t drawable,
int width, int height) {
xcb_pixmap_t pix = x_new_id(c);
xcb_void_cookie_t cookie = xcb_create_pixmap_checked(
c, depth, pix, drawable, to_u16_checked(width), to_u16_checked(height));
xcb_generic_error_t *err = xcb_request_check(c, cookie);
if (err == NULL)
return pix;
log_error("Failed to create pixmap:");
x_print_error(err->sequence, err->major_code, err->minor_code, err->error_code);
free(err);
return XCB_NONE;
}
/**
* Validate a pixmap.
*
* Detect whether the pixmap is valid with XGetGeometry. Well, maybe there
* are better ways.
*/
bool x_validate_pixmap(xcb_connection_t *c, xcb_pixmap_t pixmap) {
if (pixmap == XCB_NONE) {
return false;
}
auto r = xcb_get_geometry_reply(c, xcb_get_geometry(c, pixmap), NULL);
if (!r) {
return false;
}
bool ret = r->width && r->height;
free(r);
return ret;
}
/// Names of root window properties that could point to a pixmap of
/// background.
static const char *background_props_str[] = {
"_XROOTPMAP_ID",
"_XSETROOT_ID",
0,
};
xcb_pixmap_t x_get_root_back_pixmap(session_t *ps) {
xcb_pixmap_t pixmap = XCB_NONE;
// Get the values of background attributes
for (int p = 0; background_props_str[p]; p++) {
xcb_atom_t prop_atom = get_atom(ps->atoms, background_props_str[p]);
winprop_t prop =
wid_get_prop(ps, ps->root, prop_atom, 1, XCB_ATOM_PIXMAP, 32);
if (prop.nitems) {
pixmap = (xcb_pixmap_t)*prop.p32;
free_winprop(&prop);
break;
}
free_winprop(&prop);
}
return pixmap;
}
bool x_is_root_back_pixmap_atom(session_t *ps, xcb_atom_t atom) {
for (int p = 0; background_props_str[p]; p++) {
xcb_atom_t prop_atom = get_atom(ps->atoms, background_props_str[p]);
if (prop_atom == atom)
return true;
}
return false;
}
/**
* Synchronizes a X Render drawable to ensure all pending painting requests
* are completed.
*/
bool x_fence_sync(xcb_connection_t *c, xcb_sync_fence_t f) {
// TODO(richardgv): If everybody just follows the rules stated in X Sync
// prototype, we need only one fence per screen, but let's stay a bit
// cautious right now
auto e = xcb_request_check(c, xcb_sync_trigger_fence_checked(c, f));
if (e) {
log_error("Failed to trigger the fence.");
free(e);
return false;
}
e = xcb_request_check(c, xcb_sync_await_fence_checked(c, 1, &f));
if (e) {
log_error("Failed to await on a fence.");
free(e);
return false;
}
e = xcb_request_check(c, xcb_sync_reset_fence_checked(c, f));
if (e) {
log_error("Failed to reset the fence.");
free(e);
return false;
}
return true;
}
// xcb-render specific macros
#define XFIXED_TO_DOUBLE(value) (((double)(value)) / 65536)
#define DOUBLE_TO_XFIXED(value) ((xcb_render_fixed_t)(((double)(value)) * 65536))
/**
* Convert a struct conv to a X picture convolution filter, normalizing the kernel
* in the process. Allow the caller to specify the element at the center of the kernel,
* for compatibility with legacy code.
*
* @param[in] kernel the convolution kernel
* @param[in] center the element to put at the center of the matrix
* @param[inout] ret pointer to an array of `size`, if `size` is too small, more space
* will be allocated, and `*ret` will be updated
* @param[inout] size size of the array pointed to by `ret`, in number of elements
* @return number of elements filled into `*ret`
*/
void x_create_convolution_kernel(const conv *kernel, double center,
struct x_convolution_kernel **ret) {
assert(ret);
if (!*ret || (*ret)->capacity < kernel->w * kernel->h + 2) {
free(*ret);
*ret =
cvalloc(sizeof(struct x_convolution_kernel) +
(size_t)(kernel->w * kernel->h + 2) * sizeof(xcb_render_fixed_t));
(*ret)->capacity = kernel->w * kernel->h + 2;
}
(*ret)->size = kernel->w * kernel->h + 2;
auto buf = (*ret)->kernel;
buf[0] = DOUBLE_TO_XFIXED(kernel->w);
buf[1] = DOUBLE_TO_XFIXED(kernel->h);
double sum = center;
for (int i = 0; i < kernel->w * kernel->h; i++) {
sum += kernel->data[i];
}
// Note for floating points a / b != a * (1 / b), but this shouldn't have any real
// impact on the result
double factor = sum != 0 ? 1.0 / sum : 1;
for (int i = 0; i < kernel->w * kernel->h; i++) {
buf[i + 2] = DOUBLE_TO_XFIXED(kernel->data[i] * factor);
}
buf[kernel->h / 2 * kernel->w + kernel->w / 2 + 2] =
DOUBLE_TO_XFIXED(center * factor);
}
/// Generate a search criteria for fbconfig from a X visual.
/// Returns {-1, -1, -1, -1, -1, 0} on failure
struct xvisual_info x_get_visual_info(xcb_connection_t *c, xcb_visualid_t visual) {
auto pictfmt = x_get_pictform_for_visual(c, visual);
auto depth = x_get_visual_depth(c, visual);
if (!pictfmt || depth == -1) {
log_error("Invalid visual %#03x", visual);
return (struct xvisual_info){-1, -1, -1, -1, -1, 0};
}
if (pictfmt->type != XCB_RENDER_PICT_TYPE_DIRECT) {
log_error("compton cannot handle non-DirectColor visuals. Report an "
"issue if you see this error message.");
return (struct xvisual_info){-1, -1, -1, -1, -1, 0};
}
int red_size = popcountl(pictfmt->direct.red_mask),
blue_size = popcountl(pictfmt->direct.blue_mask),
green_size = popcountl(pictfmt->direct.green_mask),
alpha_size = popcountl(pictfmt->direct.alpha_mask);
return (struct xvisual_info){
.red_size = red_size,
.green_size = green_size,
.blue_size = blue_size,
.alpha_size = alpha_size,
.visual_depth = depth,
.visual = visual,
};
}
xcb_screen_t *x_screen_of_display(xcb_connection_t *c, int screen) {
xcb_screen_iterator_t iter;
iter = xcb_setup_roots_iterator(xcb_get_setup(c));
for (; iter.rem; --screen, xcb_screen_next(&iter))
if (screen == 0)
return iter.data;
return NULL;
}
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