0
Ceci est ma première expérience avec Cairo. Je crée la surface en utilisant cette fonction:La mémoire fuit avec Cairo
//This function should give us a new x11 surface to draw on.
cairo_surface_t *create_x11_surface(Display *d, int *x, int *y) {
Drawable da;
int screen;
cairo_surface_t *sfc;
Screen *scr;
screen = DefaultScreen(d);
scr = DefaultScreenOfDisplay(d);
if (!*x || !*y) {
*x = WidthOfScreen(scr)/2;
*y = HeightOfScreen(scr)/2;
da =
XCreateSimpleWindow(d, DefaultRootWindow(d), 0, 0, *x, *y, 0, 0, 0);
} else
da =
XCreateSimpleWindow(d, DefaultRootWindow(d), 0, 0, *x, *y, 0, 0, 0);
XSelectInput(d, da, ButtonPressMask | ButtonReleaseMask | KeyPressMask |
ButtonMotionMask | StructureNotifyMask);
// http://www.lemoda.net/c/xlib-wmclose/index.html
/* "wm_delete_window" is the Atom which corresponds to the delete
window message sent by the window manager. */
Atom wm_delete_window;
wm_delete_window = XInternAtom(d, "WM_DELETE_WINDOW", False);
/* Set up the window manager protocols. The third argument here is
meant to be an array, and the fourth argument is the size of
the array. */
XSetWMProtocols(d, da, &wm_delete_window, 1);
XMapWindow(d, da);
sfc = cairo_xlib_surface_create(d, da, DefaultVisual(d, screen), *x, *y);
return sfc;
}
Mon main() consiste à créer un objet Drawer et appelant sa méthode run. Drawer est défini comme suit (un peu simplifié, le paramètre de modèle utilisé est non représenté):
struct Drawer {
Drawer() {
d = XOpenDisplay(NULL);
if (d == NULL) {
fprintf(stderr, "Failed to open display\n");
exit(-1);
}
// create a new cairo surface in an x11 window as well as a cairo_t* to
// draw on the x11 window with.
int x=500, y=500;
surface = create_x11_surface(d, &x, &y);
cr = cairo_create(surface);
}
// https://stackoverflow.com/a/19308254/2725810
~Drawer() {
cairo_destroy(cr);
cairo_surface_destroy(surface);
XCloseDisplay(d);
}
// Returns true if need to continue or false if quiting
bool processEvents() {
XEvent e;
if (XPending(cairo_xlib_surface_get_display(surface))) {
XNextEvent(cairo_xlib_surface_get_display(surface), &e);
switch (e.type) {
case ButtonPress:
drag_start_x = e.xbutton.x;
drag_start_y = e.xbutton.y;
break;
case ButtonRelease:
last_delta_x = 0;
last_delta_y = 0;
break;
case MotionNotify:
// http://cairographics.org/manual/cairo-Transformations.html#cairo-translate
cairo_translate(cr, e.xmotion.x - drag_start_x - last_delta_x,
e.xmotion.y - drag_start_y - last_delta_y);
last_delta_x = e.xmotion.x - drag_start_x;
last_delta_y = e.xmotion.y - drag_start_y;
break;
case ConfigureNotify:
cairo_xlib_surface_set_size(surface, e.xconfigure.width,
e.xconfigure.height);
break;
case ClientMessage:
return false;
default:
fprintf(stderr, "Dropping unhandled XEevent.type = %d.\n",
e.type);
}
}
return true;
}
void draw() {
cairo_push_group(cr);
// Clear the background
cairo_set_source_rgb(cr, 0, 0, 0);
cairo_paint(cr);
cairo_set_source_rgb(cr, 0, 1, 0);
cairo_move_to(cr, 0, 0);
cairo_line_to(cr, 256, 256);
cairo_move_to(cr, 256, 0);
cairo_line_to(cr, 0, 256);
cairo_set_line_width(cr, 10.0);
cairo_stroke(cr);
cairo_pop_group_to_source(cr);
cairo_paint(cr);
cairo_surface_flush(surface);
XFlush(d);
}
void run() {
while (1) {
if (!processEvents()) break;
draw();
sleep(0.1);
}
}
private:
Display *d;
cairo_surface_t* surface;
cairo_t* cr;
int last_delta_x = 0, last_delta_y = 0;
int drag_start_x, drag_start_y;
};
Le programme est compilé avec la version 4.8.2 gcc.
valgrind signale les fuites de mémoire et indique les appels à cairo_stroke et les autres fonctions Cairo en tant que causes de la fuite. Il dit aussi que de la mémoire ne reste pas libérée quand le programme se termine malgré le fait que le destructeur de Drawer soit appelé. Voici la sortie de valgrind:
==6897== Memcheck, a memory error detector
==6897== Copyright (C) 2002-2013, and GNU GPL'd, by Julian Seward et al.
==6897== Using Valgrind-3.10.0.SVN and LibVEX; rerun with -h for copyright info
==6897== Command: ./Test
==6897==
Dropping unhandled XEevent.type = 21.
Dropping unhandled XEevent.type = 19.
Dropping unhandled XEevent.type = 65.
==6897==
==6897== HEAP SUMMARY:
==6897== in use at exit: 12,696 bytes in 12 blocks
==6897== total heap usage: 19,039 allocs, 19,027 frees, 8,088,426 bytes allocated
==6897==
==6897== 72 bytes in 1 blocks are still reachable in loss record 1 of 11
==6897== at 0x4C2AB80: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==6897== by 0x4E59F7C: ??? (in /usr/lib/x86_64-linux-gnu/libcairo.so.2.11301.0)
==6897== by 0x4E5B5B9: ??? (in /usr/lib/x86_64-linux-gnu/libcairo.so.2.11301.0)
==6897== by 0x4E5BAE5: ??? (in /usr/lib/x86_64-linux-gnu/libcairo.so.2.11301.0)
==6897== by 0x4E5CAB0: ??? (in /usr/lib/x86_64-linux-gnu/libcairo.so.2.11301.0)
==6897== by 0x4E5D87D: ??? (in /usr/lib/x86_64-linux-gnu/libcairo.so.2.11301.0)
==6897== by 0x4EA2050: ??? (in /usr/lib/x86_64-linux-gnu/libcairo.so.2.11301.0)
==6897== by 0x4EA3142: ??? (in /usr/lib/x86_64-linux-gnu/libcairo.so.2.11301.0)
==6897== by 0x4E5FECF: ??? (in /usr/lib/x86_64-linux-gnu/libcairo.so.2.11301.0)
==6897== by 0x4E57F01: cairo_push_group_with_content (in /usr/lib/x86_64-linux-gnu/libcairo.so.2.11301.0)
==6897== by 0x40590D: Drawer<NoGraph<StateNeighbor<Pancake, true> > >::draw() (Drawer.h:115)
==6897== by 0x403A7A: Drawer<NoGraph<StateNeighbor<Pancake, true> > >::run() (Drawer.h:138)
==6897==
==6897== 72 bytes in 1 blocks are still reachable in loss record 2 of 11
==6897== at 0x4C2AB80: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==6897== by 0x4E59F7C: ??? (in /usr/lib/x86_64-linux-gnu/libcairo.so.2.11301.0)
==6897== by 0x4E5B5B9: ??? (in /usr/lib/x86_64-linux-gnu/libcairo.so.2.11301.0)
==6897== by 0x4E5BAE5: ??? (in /usr/lib/x86_64-linux-gnu/libcairo.so.2.11301.0)
==6897== by 0x4E5CDB2: ??? (in /usr/lib/x86_64-linux-gnu/libcairo.so.2.11301.0)
==6897== by 0x4EB4DE3: ??? (in /usr/lib/x86_64-linux-gnu/libcairo.so.2.11301.0)
==6897== by 0x4E5DA63: ??? (in /usr/lib/x86_64-linux-gnu/libcairo.so.2.11301.0)
==6897== by 0x4ECEA3C: ??? (in /usr/lib/x86_64-linux-gnu/libcairo.so.2.11301.0)
==6897== by 0x4EA2411: ??? (in /usr/lib/x86_64-linux-gnu/libcairo.so.2.11301.0)
==6897== by 0x4E651E1: ??? (in /usr/lib/x86_64-linux-gnu/libcairo.so.2.11301.0)
==6897== by 0x4E5F168: ??? (in /usr/lib/x86_64-linux-gnu/libcairo.so.2.11301.0)
==6897== by 0x4E58994: cairo_stroke (in /usr/lib/x86_64-linux-gnu/libcairo.so.2.11301.0)
==6897==
==6897== 160 bytes in 1 blocks are still reachable in loss record 3 of 11
==6897== at 0x4C2AB80: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==6897== by 0x4E850BC: ??? (in /usr/lib/x86_64-linux-gnu/libcairo.so.2.11301.0)
==6897== by 0x4E851BC: cairo_pattern_create_rgba (in /usr/lib/x86_64-linux-gnu/libcairo.so.2.11301.0)
==6897== by 0x4E6028A: ??? (in /usr/lib/x86_64-linux-gnu/libcairo.so.2.11301.0)
==6897== by 0x4E57FC9: cairo_set_source_rgb (in /usr/lib/x86_64-linux-gnu/libcairo.so.2.11301.0)
==6897== by 0x405959: Drawer<NoGraph<StateNeighbor<Pancake, true> > >::draw() (Drawer.h:121)
==6897== by 0x403A7A: Drawer<NoGraph<StateNeighbor<Pancake, true> > >::run() (Drawer.h:138)
==6897== by 0x402269: main (Test.cpp:48)
==6897==
==6897== 256 bytes in 2 blocks are still reachable in loss record 4 of 11
==6897== at 0x4C2AB80: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==6897== by 0x4E8529A: cairo_pattern_create_for_surface (in /usr/lib/x86_64-linux-gnu/libcairo.so.2.11301.0)
==6897== by 0x4E5FD7F: ??? (in /usr/lib/x86_64-linux-gnu/libcairo.so.2.11301.0)
==6897== by 0x4E57F48: cairo_pop_group (in /usr/lib/x86_64-linux-gnu/libcairo.so.2.11301.0)
==6897== by 0x4E5809D: cairo_pop_group_to_source (in /usr/lib/x86_64-linux-gnu/libcairo.so.2.11301.0)
==6897== by 0x405A38: Drawer<NoGraph<StateNeighbor<Pancake, true> > >::draw() (Drawer.h:129)
==6897== by 0x403A7A: Drawer<NoGraph<StateNeighbor<Pancake, true> > >::run() (Drawer.h:138)
==6897== by 0x402269: main (Test.cpp:48)
==6897==
==6897== 352 bytes in 1 blocks are definitely lost in loss record 5 of 11
==6897== at 0x4C2AB80: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==6897== by 0x4ECC831: ??? (in /usr/lib/x86_64-linux-gnu/libcairo.so.2.11301.0)
==6897== by 0x4ECC933: ??? (in /usr/lib/x86_64-linux-gnu/libcairo.so.2.11301.0)
==6897== by 0x4ECD497: ??? (in /usr/lib/x86_64-linux-gnu/libcairo.so.2.11301.0)
==6897== by 0x4EB3922: ??? (in /usr/lib/x86_64-linux-gnu/libcairo.so.2.11301.0)
==6897== by 0x4EB4E32: ??? (in /usr/lib/x86_64-linux-gnu/libcairo.so.2.11301.0)
==6897== by 0x4E5DA63: ??? (in /usr/lib/x86_64-linux-gnu/libcairo.so.2.11301.0)
==6897== by 0x4ECEA3C: ??? (in /usr/lib/x86_64-linux-gnu/libcairo.so.2.11301.0)
==6897== by 0x4EA2411: ??? (in /usr/lib/x86_64-linux-gnu/libcairo.so.2.11301.0)
==6897== by 0x4E651E1: ??? (in /usr/lib/x86_64-linux-gnu/libcairo.so.2.11301.0)
==6897== by 0x4E5F168: ??? (in /usr/lib/x86_64-linux-gnu/libcairo.so.2.11301.0)
==6897== by 0x4E58994: cairo_stroke (in /usr/lib/x86_64-linux-gnu/libcairo.so.2.11301.0)
==6897==
==6897== 1,424 bytes in 1 blocks are still reachable in loss record 6 of 11
==6897== at 0x4C2AB80: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==6897== by 0x4E604E7: ??? (in /usr/lib/x86_64-linux-gnu/libcairo.so.2.11301.0)
==6897== by 0x403A04: Drawer<NoGraph<StateNeighbor<Pancake, true> > >::Drawer(NoGraph<StateNeighbor<Pancake, true> > const&) (Drawer.h:66)
==6897== by 0x40225D: main (Test.cpp:47)
==6897==
==6897== 2,072 bytes in 1 blocks are still reachable in loss record 7 of 11
==6897== at 0x4C2AB80: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==6897== by 0x5FCCE9A: ??? (in /usr/lib/x86_64-linux-gnu/libpixman-1.so.0.30.2)
==6897== by 0x5FCBACE: ??? (in /usr/lib/x86_64-linux-gnu/libpixman-1.so.0.30.2)
==6897== by 0x5FCD585: ??? (in /usr/lib/x86_64-linux-gnu/libpixman-1.so.0.30.2)
==6897== by 0x5F7F508: ??? (in /usr/lib/x86_64-linux-gnu/libpixman-1.so.0.30.2)
==6897== by 0x4010139: call_init.part.0 (dl-init.c:78)
==6897== by 0x4010222: _dl_init (dl-init.c:36)
==6897== by 0x4001309: ??? (in /lib/x86_64-linux-gnu/ld-2.19.so)
==6897==
==6897== 2,072 bytes in 1 blocks are still reachable in loss record 8 of 11
==6897== at 0x4C2AB80: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==6897== by 0x5FCCE9A: ??? (in /usr/lib/x86_64-linux-gnu/libpixman-1.so.0.30.2)
==6897== by 0x5FCA61F: ??? (in /usr/lib/x86_64-linux-gnu/libpixman-1.so.0.30.2)
==6897== by 0x5FCD5A0: ??? (in /usr/lib/x86_64-linux-gnu/libpixman-1.so.0.30.2)
==6897== by 0x5F7F508: ??? (in /usr/lib/x86_64-linux-gnu/libpixman-1.so.0.30.2)
==6897== by 0x4010139: call_init.part.0 (dl-init.c:78)
==6897== by 0x4010222: _dl_init (dl-init.c:36)
==6897== by 0x4001309: ??? (in /lib/x86_64-linux-gnu/ld-2.19.so)
==6897==
==6897== 2,072 bytes in 1 blocks are still reachable in loss record 9 of 11
==6897== at 0x4C2AB80: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==6897== by 0x5FCCE9A: ??? (in /usr/lib/x86_64-linux-gnu/libpixman-1.so.0.30.2)
==6897== by 0x5FE5A8F: ??? (in /usr/lib/x86_64-linux-gnu/libpixman-1.so.0.30.2)
==6897== by 0x5FBC1A5: ??? (in /usr/lib/x86_64-linux-gnu/libpixman-1.so.0.30.2)
==6897== by 0x5FCD5AB: ??? (in /usr/lib/x86_64-linux-gnu/libpixman-1.so.0.30.2)
==6897== by 0x5F7F508: ??? (in /usr/lib/x86_64-linux-gnu/libpixman-1.so.0.30.2)
==6897== by 0x4010139: call_init.part.0 (dl-init.c:78)
==6897== by 0x4010222: _dl_init (dl-init.c:36)
==6897== by 0x4001309: ??? (in /lib/x86_64-linux-gnu/ld-2.19.so)
==6897==
==6897== 2,072 bytes in 1 blocks are still reachable in loss record 10 of 11
==6897== at 0x4C2AB80: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==6897== by 0x5FCCE9A: ??? (in /usr/lib/x86_64-linux-gnu/libpixman-1.so.0.30.2)
==6897== by 0x60053CF: ??? (in /usr/lib/x86_64-linux-gnu/libpixman-1.so.0.30.2)
==6897== by 0x5FCD5AB: ??? (in /usr/lib/x86_64-linux-gnu/libpixman-1.so.0.30.2)
==6897== by 0x5F7F508: ??? (in /usr/lib/x86_64-linux-gnu/libpixman-1.so.0.30.2)
==6897== by 0x4010139: call_init.part.0 (dl-init.c:78)
==6897== by 0x4010222: _dl_init (dl-init.c:36)
==6897== by 0x4001309: ??? (in /lib/x86_64-linux-gnu/ld-2.19.so)
==6897==
==6897== 2,072 bytes in 1 blocks are still reachable in loss record 11 of 11
==6897== at 0x4C2AB80: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==6897== by 0x5FCCE9A: ??? (in /usr/lib/x86_64-linux-gnu/libpixman-1.so.0.30.2)
==6897== by 0x5FCFCBF: ??? (in /usr/lib/x86_64-linux-gnu/libpixman-1.so.0.30.2)
==6897== by 0x5F7F508: ??? (in /usr/lib/x86_64-linux-gnu/libpixman-1.so.0.30.2)
==6897== by 0x4010139: call_init.part.0 (dl-init.c:78)
==6897== by 0x4010222: _dl_init (dl-init.c:36)
==6897== by 0x4001309: ??? (in /lib/x86_64-linux-gnu/ld-2.19.so)
==6897==
==6897== LEAK SUMMARY:
==6897== definitely lost: 352 bytes in 1 blocks
==6897== indirectly lost: 0 bytes in 0 blocks
==6897== possibly lost: 0 bytes in 0 blocks
==6897== still reachable: 12,344 bytes in 11 blocks
==6897== suppressed: 0 bytes in 0 blocks
==6897==
==6897== For counts of detected and suppressed errors, rerun with: -v
==6897== ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 0 from 0)
Qu'est-ce que je fais pas?
MISE À JOUR: Après avoir inséré un appel à cairo_debug_reset_static_data() du destructor comme suggéré here, la sortie de valgrind est devenu un peu plus courte:
==7310== Memcheck, a memory error detector
==7310== Copyright (C) 2002-2013, and GNU GPL'd, by Julian Seward et al.
==7310== Using Valgrind-3.10.0.SVN and LibVEX; rerun with -h for copyright info
==7310== Command: ./Test
==7310==
Dropping unhandled XEevent.type = 21.
Dropping unhandled XEevent.type = 19.
Dropping unhandled XEevent.type = 65.
==7310==
==7310== HEAP SUMMARY:
==7310== in use at exit: 10,712 bytes in 6 blocks
==7310== total heap usage: 29,352 allocs, 29,346 frees, 12,459,938 bytes allocated
==7310==
==7310== 352 bytes in 1 blocks are definitely lost in loss record 1 of 6
==7310== at 0x4C2AB80: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==7310== by 0x4ECC831: ??? (in /usr/lib/x86_64-linux-gnu/libcairo.so.2.11301.0)
==7310== by 0x4ECC933: ??? (in /usr/lib/x86_64-linux-gnu/libcairo.so.2.11301.0)
==7310== by 0x4ECD497: ??? (in /usr/lib/x86_64-linux-gnu/libcairo.so.2.11301.0)
==7310== by 0x4EB3922: ??? (in /usr/lib/x86_64-linux-gnu/libcairo.so.2.11301.0)
==7310== by 0x4EB4E32: ??? (in /usr/lib/x86_64-linux-gnu/libcairo.so.2.11301.0)
==7310== by 0x4E5DA63: ??? (in /usr/lib/x86_64-linux-gnu/libcairo.so.2.11301.0)
==7310== by 0x4ECEA3C: ??? (in /usr/lib/x86_64-linux-gnu/libcairo.so.2.11301.0)
==7310== by 0x4EA2411: ??? (in /usr/lib/x86_64-linux-gnu/libcairo.so.2.11301.0)
==7310== by 0x4E651E1: ??? (in /usr/lib/x86_64-linux-gnu/libcairo.so.2.11301.0)
==7310== by 0x4E5F168: ??? (in /usr/lib/x86_64-linux-gnu/libcairo.so.2.11301.0)
==7310== by 0x4E58994: cairo_stroke (in /usr/lib/x86_64-linux-gnu/libcairo.so.2.11301.0)
==7310==
==7310== 2,072 bytes in 1 blocks are still reachable in loss record 2 of 6
==7310== at 0x4C2AB80: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==7310== by 0x5FCCE9A: ??? (in /usr/lib/x86_64-linux-gnu/libpixman-1.so.0.30.2)
==7310== by 0x5FCBACE: ??? (in /usr/lib/x86_64-linux-gnu/libpixman-1.so.0.30.2)
==7310== by 0x5FCD585: ??? (in /usr/lib/x86_64-linux-gnu/libpixman-1.so.0.30.2)
==7310== by 0x5F7F508: ??? (in /usr/lib/x86_64-linux-gnu/libpixman-1.so.0.30.2)
==7310== by 0x4010139: call_init.part.0 (dl-init.c:78)
==7310== by 0x4010222: _dl_init (dl-init.c:36)
==7310== by 0x4001309: ??? (in /lib/x86_64-linux-gnu/ld-2.19.so)
==7310==
==7310== 2,072 bytes in 1 blocks are still reachable in loss record 3 of 6
==7310== at 0x4C2AB80: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==7310== by 0x5FCCE9A: ??? (in /usr/lib/x86_64-linux-gnu/libpixman-1.so.0.30.2)
==7310== by 0x5FCA61F: ??? (in /usr/lib/x86_64-linux-gnu/libpixman-1.so.0.30.2)
==7310== by 0x5FCD5A0: ??? (in /usr/lib/x86_64-linux-gnu/libpixman-1.so.0.30.2)
==7310== by 0x5F7F508: ??? (in /usr/lib/x86_64-linux-gnu/libpixman-1.so.0.30.2)
==7310== by 0x4010139: call_init.part.0 (dl-init.c:78)
==7310== by 0x4010222: _dl_init (dl-init.c:36)
==7310== by 0x4001309: ??? (in /lib/x86_64-linux-gnu/ld-2.19.so)
==7310==
==7310== 2,072 bytes in 1 blocks are still reachable in loss record 4 of 6
==7310== at 0x4C2AB80: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==7310== by 0x5FCCE9A: ??? (in /usr/lib/x86_64-linux-gnu/libpixman-1.so.0.30.2)
==7310== by 0x5FE5A8F: ??? (in /usr/lib/x86_64-linux-gnu/libpixman-1.so.0.30.2)
==7310== by 0x5FBC1A5: ??? (in /usr/lib/x86_64-linux-gnu/libpixman-1.so.0.30.2)
==7310== by 0x5FCD5AB: ??? (in /usr/lib/x86_64-linux-gnu/libpixman-1.so.0.30.2)
==7310== by 0x5F7F508: ??? (in /usr/lib/x86_64-linux-gnu/libpixman-1.so.0.30.2)
==7310== by 0x4010139: call_init.part.0 (dl-init.c:78)
==7310== by 0x4010222: _dl_init (dl-init.c:36)
==7310== by 0x4001309: ??? (in /lib/x86_64-linux-gnu/ld-2.19.so)
==7310==
==7310== 2,072 bytes in 1 blocks are still reachable in loss record 5 of 6
==7310== at 0x4C2AB80: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==7310== by 0x5FCCE9A: ??? (in /usr/lib/x86_64-linux-gnu/libpixman-1.so.0.30.2)
==7310== by 0x60053CF: ??? (in /usr/lib/x86_64-linux-gnu/libpixman-1.so.0.30.2)
==7310== by 0x5FCD5AB: ??? (in /usr/lib/x86_64-linux-gnu/libpixman-1.so.0.30.2)
==7310== by 0x5F7F508: ??? (in /usr/lib/x86_64-linux-gnu/libpixman-1.so.0.30.2)
==7310== by 0x4010139: call_init.part.0 (dl-init.c:78)
==7310== by 0x4010222: _dl_init (dl-init.c:36)
==7310== by 0x4001309: ??? (in /lib/x86_64-linux-gnu/ld-2.19.so)
==7310==
==7310== 2,072 bytes in 1 blocks are still reachable in loss record 6 of 6
==7310== at 0x4C2AB80: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==7310== by 0x5FCCE9A: ??? (in /usr/lib/x86_64-linux-gnu/libpixman-1.so.0.30.2)
==7310== by 0x5FCFCBF: ??? (in /usr/lib/x86_64-linux-gnu/libpixman-1.so.0.30.2)
==7310== by 0x5F7F508: ??? (in /usr/lib/x86_64-linux-gnu/libpixman-1.so.0.30.2)
==7310== by 0x4010139: call_init.part.0 (dl-init.c:78)
==7310== by 0x4010222: _dl_init (dl-init.c:36)
==7310== by 0x4001309: ??? (in /lib/x86_64-linux-gnu/ld-2.19.so)
==7310==
==7310== LEAK SUMMARY:
==7310== definitely lost: 352 bytes in 1 blocks
==7310== indirectly lost: 0 bytes in 0 blocks
==7310== possibly lost: 0 bytes in 0 blocks
==7310== still reachable: 10,360 bytes in 5 blocks
==7310== suppressed: 0 bytes in 0 blocks
==7310==
==7310== For counts of detected and suppressed errors, rerun with: -v
==7310== ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 0 from 0)
BTW, pourquoi ne pas valgrind montrer la pleine callstack pour les perdus enregistrer et s'arrête à cairo_stroke à la place? Mon programme est compilé avec gcc avec le drapeau -g ...
MISE À JOUR: Comme demandé dans les commentaires, voici le tout exemple de travail:
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <cairo-xlib.h>
#include <X11/Xlib.h>
#include <X11/Xatom.h>
#include <X11/Xutil.h>
#include <unistd.h>
//This function should give us a new x11 surface to draw on.
cairo_surface_t *create_x11_surface(Display *d, int *x, int *y) {
Drawable da;
int screen;
cairo_surface_t *sfc;
Screen *scr;
screen = DefaultScreen(d);
scr = DefaultScreenOfDisplay(d);
if (!*x || !*y) {
*x = WidthOfScreen(scr)/2;
*y = HeightOfScreen(scr)/2;
da =
XCreateSimpleWindow(d, DefaultRootWindow(d), 0, 0, *x, *y, 0, 0, 0);
} else
da =
XCreateSimpleWindow(d, DefaultRootWindow(d), 0, 0, *x, *y, 0, 0, 0);
XSelectInput(d, da, ButtonPressMask | ButtonReleaseMask | KeyPressMask |
ButtonMotionMask | StructureNotifyMask);
// http://www.lemoda.net/c/xlib-wmclose/index.html
/* "wm_delete_window" is the Atom which corresponds to the delete
window message sent by the window manager. */
Atom wm_delete_window;
wm_delete_window = XInternAtom(d, "WM_DELETE_WINDOW", False);
/* Set up the window manager protocols. The third argument here is
meant to be an array, and the fourth argument is the size of
the array. */
XSetWMProtocols(d, da, &wm_delete_window, 1);
XMapWindow(d, da);
sfc = cairo_xlib_surface_create(d, da, DefaultVisual(d, screen), *x, *y);
return sfc;
}
struct Drawer {
Drawer() {
d = XOpenDisplay(NULL);
if (d == NULL) {
fprintf(stderr, "Failed to open display\n");
exit(-1);
}
// create a new cairo surface in an x11 window as well as a cairo_t* to
// draw on the x11 window with.
int x=500, y=500;
surface = create_x11_surface(d, &x, &y);
cr = cairo_create(surface);
}
// https://stackoverflow.com/a/19308254/2725810
~Drawer() {
cairo_destroy(cr);
cairo_surface_destroy(surface);
XCloseDisplay(d);
}
// Returns true if need to continue or false if quiting
bool processEvents() {
XEvent e;
if (XPending(cairo_xlib_surface_get_display(surface))) {
XNextEvent(cairo_xlib_surface_get_display(surface), &e);
switch (e.type) {
case ButtonPress:
drag_start_x = e.xbutton.x;
drag_start_y = e.xbutton.y;
break;
case ButtonRelease:
last_delta_x = 0;
last_delta_y = 0;
break;
case MotionNotify:
// http://cairographics.org/manual/cairo-Transformations.html#cairo-translate
cairo_translate(cr, e.xmotion.x - drag_start_x - last_delta_x,
e.xmotion.y - drag_start_y - last_delta_y);
last_delta_x = e.xmotion.x - drag_start_x;
last_delta_y = e.xmotion.y - drag_start_y;
break;
case ConfigureNotify:
cairo_xlib_surface_set_size(surface, e.xconfigure.width,
e.xconfigure.height);
break;
case ClientMessage:
return false;
default:
fprintf(stderr, "Dropping unhandled XEevent.type = %d.\n",
e.type);
}
}
return true;
}
void draw() {
cairo_push_group(cr);
// Clear the background
cairo_set_source_rgb(cr, 0, 0, 0);
cairo_paint(cr);
cairo_set_source_rgb(cr, 0, 1, 0);
cairo_move_to(cr, 0, 0);
cairo_line_to(cr, 256, 256);
cairo_move_to(cr, 256, 0);
cairo_line_to(cr, 0, 256);
cairo_set_line_width(cr, 10.0);
cairo_stroke(cr);
cairo_pop_group_to_source(cr);
cairo_paint(cr);
cairo_surface_flush(surface);
XFlush(d);
}
void run() {
while (1) {
if (!processEvents()) break;
draw();
sleep(0.1);
}
}
private:
Display *d;
cairo_surface_t* surface;
cairo_t* cr;
int last_delta_x = 0, last_delta_y = 0;
int drag_start_x, drag_start_y;
};
int main() {
Drawer d;
d.run();
return 0;
}
Je sais que ces fuites (ou blocs atteignables) sont inoffensives. Leur seul mal est qu'ils polluent la sortie de 'valgrind' et je dois passer par toutes ces lignes inutiles pour arriver à ce dont je me soucie vraiment. Par conséquent, il est important pour moi d'avoir un moyen de supprimer toutes ces lignes inutiles. Aussi, aucune idée pourquoi je vois une fuite de 'cairo_stroke'? – AlwaysLearning
Eh bien, quelle est votre version cairo? Peut-être que c'est quelque chose de spécifique à la version? En plus de ça, aucune idée. Je ne pense pas que ma version cairo fasse quelque chose de spécial. –
Le paquet est appelé 'libcairo2-dev'. C'est celui fourni avec Ubuntu 14.04 LTS. Un moyen de savoir plus précisément? – AlwaysLearning