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cairo-xlib-surface-shm.c
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/* -*- Mode: c; c-basic-offset: 4; indent-tabs-mode: t; tab-width: 8; -*- */
/* cairo - a vector graphics library with display and print output
*
* Copyright © 2012 Intel Corporation
*
* This library is free software; you can redistribute it and/or
* modify it either under the terms of the GNU Lesser General Public
* License version 2.1 as published by the Free Software Foundation
* (the "LGPL") or, at your option, under the terms of the Mozilla
* Public License Version 1.1 (the "MPL"). If you do not alter this
* notice, a recipient may use your version of this file under either
* the MPL or the LGPL.
*
* You should have received a copy of the LGPL along with this library
* in the file COPYING-LGPL-2.1; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA
* You should have received a copy of the MPL along with this library
* in the file COPYING-MPL-1.1
*
* The contents of this file are subject to the Mozilla Public License
* Version 1.1 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
* OF ANY KIND, either express or implied. See the LGPL or the MPL for
* the specific language governing rights and limitations.
*
* The Original Code is the cairo graphics library.
*
* The Initial Developer of the Original Code is University of Southern
* California.
*
* Contributor(s):
* Chris Wilson <[email protected]>
*/
#include "cairoint.h"
#if !CAIRO_HAS_XLIB_XCB_FUNCTIONS
#include "cairo-xlib-private.h"
#include "cairo-xlib-surface-private.h"
#if !HAVE_X11_EXTENSIONS_XSHM_H || !(HAVE_X11_EXTENSIONS_SHMPROTO_H || HAVE_X11_EXTENSIONS_SHMSTR_H)
void _cairo_xlib_display_init_shm (cairo_xlib_display_t *display) {}
cairo_surface_t *
_cairo_xlib_surface_get_shm (cairo_xlib_surface_t *surface,
cairo_bool_t overwrite)
{
return NULL;
}
cairo_int_status_t
_cairo_xlib_surface_put_shm (cairo_xlib_surface_t *surface)
{
assert (!surface->fallback);
return CAIRO_INT_STATUS_SUCCESS;
}
cairo_surface_t *
_cairo_xlib_surface_create_shm (cairo_xlib_surface_t *other,
pixman_format_code_t format,
int width, int height)
{
return NULL;
}
cairo_surface_t *
_cairo_xlib_surface_create_shm__image (cairo_xlib_surface_t *surface,
pixman_format_code_t format,
int width, int height)
{
return NULL;
}
cairo_surface_t *
_cairo_xlib_surface_create_similar_shm (void *other,
cairo_format_t format,
int width, int height)
{
return cairo_image_surface_create (format, width, height);
}
void
_cairo_xlib_shm_surface_mark_active (cairo_surface_t *_shm)
{
ASSERT_NOT_REACHED;
}
void
_cairo_xlib_shm_surface_get_ximage (cairo_surface_t *surface,
XImage *ximage)
{
ASSERT_NOT_REACHED;
}
void *
_cairo_xlib_shm_surface_get_obdata (cairo_surface_t *surface)
{
ASSERT_NOT_REACHED;
return NULL;
}
Pixmap
_cairo_xlib_shm_surface_get_pixmap (cairo_surface_t *surface)
{
ASSERT_NOT_REACHED;
return 0;
}
XRenderPictFormat *
_cairo_xlib_shm_surface_get_xrender_format (cairo_surface_t *surface)
{
ASSERT_NOT_REACHED;
return NULL;
}
cairo_bool_t
_cairo_xlib_shm_surface_is_active (cairo_surface_t *surface)
{
ASSERT_NOT_REACHED;
return FALSE;
}
cairo_bool_t
_cairo_xlib_shm_surface_is_idle (cairo_surface_t *surface)
{
ASSERT_NOT_REACHED;
return TRUE;
}
void _cairo_xlib_display_fini_shm (cairo_xlib_display_t *display) {}
#else
#include "cairo-damage-private.h"
#include "cairo-default-context-private.h"
#include "cairo-image-surface-private.h"
#include "cairo-list-inline.h"
#include "cairo-mempool-private.h"
#include <X11/Xlibint.h>
#include <X11/Xproto.h>
#include <X11/extensions/XShm.h>
#if HAVE_X11_EXTENSIONS_SHMPROTO_H
#include <X11/extensions/shmproto.h>
#elif HAVE_X11_EXTENSIONS_SHMSTR_H
#include <X11/extensions/shmstr.h>
#endif
#include <sys/ipc.h>
#include <sys/shm.h>
#define MIN_PIXMAP_SIZE 4096
#define MIN_BITS 8
#define MIN_SIZE (1<<(MIN_BITS-1))
typedef struct _cairo_xlib_shm cairo_xlib_shm_t;
typedef struct _cairo_xlib_shm_info cairo_xlib_shm_info_t;
typedef struct _cairo_xlib_shm_surface cairo_xlib_shm_surface_t;
struct _cairo_xlib_shm {
cairo_mempool_t mem;
XShmSegmentInfo shm;
unsigned long attached;
cairo_list_t link;
};
struct _cairo_xlib_shm_info {
unsigned long last_request;
void *mem;
size_t size;
cairo_xlib_shm_t *pool;
};
struct _cairo_xlib_shm_surface {
cairo_image_surface_t image;
cairo_list_t link;
cairo_xlib_shm_info_t *info;
Pixmap pixmap;
unsigned long active;
int idle;
};
/* the parent is always given by index/2 */
#define PQ_PARENT_INDEX(i) ((i) >> 1)
#define PQ_FIRST_ENTRY 1
/* left and right children are index * 2 and (index * 2) +1 respectively */
#define PQ_LEFT_CHILD_INDEX(i) ((i) << 1)
#define PQ_TOP(pq) ((pq)->elements[PQ_FIRST_ENTRY])
struct pqueue {
int size, max_size;
cairo_xlib_shm_info_t **elements;
};
struct _cairo_xlib_shm_display {
int has_pixmaps;
int opcode;
int event;
Window window;
cairo_list_t surfaces;
cairo_list_t pool;
struct pqueue info;
};
static inline cairo_bool_t
seqno_passed (unsigned long a, unsigned long b)
{
return (long)(b - a) > 0;
}
static inline cairo_status_t
_pqueue_init (struct pqueue *pq)
{
pq->max_size = 32;
pq->size = 0;
pq->elements = _cairo_malloc_ab (pq->max_size,
sizeof (cairo_xlib_shm_info_t *));
if (unlikely (pq->elements == NULL))
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
PQ_TOP(pq) = NULL;
return CAIRO_STATUS_SUCCESS;
}
static inline void
_pqueue_fini (struct pqueue *pq)
{
free (pq->elements);
}
static cairo_status_t
_pqueue_grow (struct pqueue *pq)
{
cairo_xlib_shm_info_t **new_elements;
new_elements = _cairo_realloc_ab (pq->elements,
2 * pq->max_size,
sizeof (cairo_xlib_shm_info_t *));
if (unlikely (new_elements == NULL))
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
pq->elements = new_elements;
pq->max_size *= 2;
return CAIRO_STATUS_SUCCESS;
}
static void
_pqueue_shrink (struct pqueue *pq, int min_size)
{
cairo_xlib_shm_info_t **new_elements;
if (min_size > pq->max_size)
return;
new_elements = _cairo_realloc_ab (pq->elements,
min_size,
sizeof (cairo_xlib_shm_info_t *));
if (unlikely (new_elements == NULL))
return;
pq->elements = new_elements;
pq->max_size = min_size;
}
static inline cairo_status_t
_pqueue_push (struct pqueue *pq, cairo_xlib_shm_info_t *info)
{
cairo_xlib_shm_info_t **elements;
int i, parent;
if (unlikely (pq->size + 1 == pq->max_size)) {
cairo_status_t status;
status = _pqueue_grow (pq);
if (unlikely (status))
return status;
}
elements = pq->elements;
for (i = ++pq->size;
i != PQ_FIRST_ENTRY &&
info->last_request < elements[parent = PQ_PARENT_INDEX (i)]->last_request;
i = parent)
{
elements[i] = elements[parent];
}
elements[i] = info;
return CAIRO_STATUS_SUCCESS;
}
static inline void
_pqueue_pop (struct pqueue *pq)
{
cairo_xlib_shm_info_t **elements = pq->elements;
cairo_xlib_shm_info_t *tail;
int child, i;
tail = elements[pq->size--];
if (pq->size == 0) {
elements[PQ_FIRST_ENTRY] = NULL;
_pqueue_shrink (pq, 32);
return;
}
for (i = PQ_FIRST_ENTRY;
(child = PQ_LEFT_CHILD_INDEX (i)) <= pq->size;
i = child)
{
if (child != pq->size &&
elements[child+1]->last_request < elements[child]->last_request)
{
child++;
}
if (elements[child]->last_request >= tail->last_request)
break;
elements[i] = elements[child];
}
elements[i] = tail;
}
static cairo_bool_t _x_error_occurred;
static int
_check_error_handler (Display *display,
XErrorEvent *event)
{
_x_error_occurred = TRUE;
return False; /* ignored */
}
static cairo_bool_t
can_use_shm (Display *dpy, int *has_pixmap)
{
XShmSegmentInfo shm;
int (*old_handler) (Display *display, XErrorEvent *event);
Status success;
int major, minor;
if (! XShmQueryExtension (dpy))
return FALSE;
XShmQueryVersion (dpy, &major, &minor, has_pixmap);
shm.shmid = shmget (IPC_PRIVATE, 0x1000, IPC_CREAT | 0600);
if (shm.shmid == -1)
return FALSE;
shm.readOnly = FALSE;
shm.shmaddr = shmat (shm.shmid, NULL, 0);
if (shm.shmaddr == (char *) -1) {
shmctl (shm.shmid, IPC_RMID, NULL);
return FALSE;
}
assert (CAIRO_MUTEX_IS_LOCKED (_cairo_xlib_display_mutex));
_x_error_occurred = FALSE;
XLockDisplay (dpy);
XSync (dpy, False);
old_handler = XSetErrorHandler (_check_error_handler);
success = XShmAttach (dpy, &shm);
if (success)
XShmDetach (dpy, &shm);
XSync (dpy, False);
XSetErrorHandler (old_handler);
XUnlockDisplay (dpy);
shmctl (shm.shmid, IPC_RMID, NULL);
shmdt (shm.shmaddr);
return success && ! _x_error_occurred;
}
static inline Display *
peek_display (cairo_device_t *device)
{
return ((cairo_xlib_display_t *)device)->display;
}
static inline unsigned long
peek_processed (cairo_device_t *device)
{
return LastKnownRequestProcessed (peek_display(device));
}
static unsigned next_request (cairo_device_t *device)
{
return NextRequest (peek_display (device));
}
static void
_cairo_xlib_display_shm_pool_destroy (cairo_xlib_display_t *display,
cairo_xlib_shm_t *pool)
{
shmdt (pool->shm.shmaddr);
if (display->display) /* may be called after CloseDisplay */
XShmDetach (display->display, &pool->shm);
_cairo_mempool_fini (&pool->mem);
cairo_list_del (&pool->link);
free (pool);
}
static void
_cairo_xlib_shm_info_cleanup (cairo_xlib_display_t *display)
{
cairo_xlib_shm_info_t *info;
Display *dpy = display->display;
struct pqueue *pq = &display->shm->info;
unsigned long processed;
if (PQ_TOP(pq) == NULL)
return;
XEventsQueued (dpy, QueuedAfterReading);
processed = LastKnownRequestProcessed (dpy);
info = PQ_TOP(pq);
do {
if (! seqno_passed (info->last_request, processed))
break;
_cairo_mempool_free (&info->pool->mem, info->mem);
_pqueue_pop (&display->shm->info);
free (info);
} while ((info = PQ_TOP(pq)));
}
static cairo_xlib_shm_info_t *
_cairo_xlib_shm_info_find (cairo_xlib_display_t *display,
size_t size, unsigned long *last_request)
{
cairo_xlib_shm_info_t *info;
struct pqueue *pq = &display->shm->info;
if (PQ_TOP(pq) == NULL)
return NULL;
info = PQ_TOP(pq);
do {
_pqueue_pop (&display->shm->info);
if (info->size >= size && size <= 2*info->size)
return info;
*last_request = info->last_request;
_cairo_mempool_free (&info->pool->mem, info->mem);
free (info);
} while ((info = PQ_TOP(pq)));
return NULL;
}
static cairo_xlib_shm_t *
_cairo_xlib_shm_pool_find (cairo_xlib_display_t *display,
size_t size,
void **ptr)
{
cairo_xlib_shm_t *pool;
cairo_list_foreach_entry (pool, cairo_xlib_shm_t, &display->shm->pool, link) {
if (pool->mem.free_bytes >= size) {
void *mem = _cairo_mempool_alloc (&pool->mem, size);
if (mem != NULL) {
*ptr = mem;
return pool;
}
}
}
return NULL;
}
static void
_cairo_xlib_shm_pool_cleanup (cairo_xlib_display_t *display)
{
cairo_xlib_shm_t *pool, *next;
unsigned long processed;
processed = LastKnownRequestProcessed (display->display);
cairo_list_foreach_entry_safe (pool, next, cairo_xlib_shm_t,
&display->shm->pool, link) {
if (! seqno_passed (pool->attached, processed))
break;
if (pool->mem.free_bytes == pool->mem.max_bytes)
_cairo_xlib_display_shm_pool_destroy (display, pool);
}
}
static cairo_xlib_shm_t *
_cairo_xlib_shm_pool_create(cairo_xlib_display_t *display,
size_t size, void **ptr)
{
Display *dpy = display->display;
cairo_xlib_shm_t *pool;
size_t bytes, maxbits = 16, minbits = MIN_BITS;
Status success;
pool = malloc (sizeof (cairo_xlib_shm_t));
if (pool == NULL)
return NULL;
bytes = 1 << maxbits;
while (bytes <= size)
bytes <<= 1, maxbits++;
bytes <<= 3;
minbits += (maxbits - 16) / 2;
pool->shm.shmid = shmget (IPC_PRIVATE, bytes, IPC_CREAT | 0600);
while (pool->shm.shmid == -1 && bytes >= 2*size) {
bytes >>= 1;
pool->shm.shmid = shmget (IPC_PRIVATE, bytes, IPC_CREAT | 0600);
}
if (pool->shm.shmid == -1)
goto cleanup;
pool->shm.readOnly = FALSE;
pool->shm.shmaddr = shmat (pool->shm.shmid, NULL, 0);
if (pool->shm.shmaddr == (char *) -1) {
shmctl (pool->shm.shmid, IPC_RMID, NULL);
goto cleanup;
}
pool->attached = NextRequest (dpy);
success = XShmAttach (dpy, &pool->shm);
#if !IPC_RMID_DEFERRED_RELEASE
XSync (dpy, FALSE);
#endif
shmctl (pool->shm.shmid, IPC_RMID, NULL);
if (! success)
goto cleanup_shm;
if (_cairo_mempool_init (&pool->mem, pool->shm.shmaddr, bytes,
minbits, maxbits - minbits + 1))
goto cleanup_detach;
cairo_list_add (&pool->link, &display->shm->pool);
*ptr = _cairo_mempool_alloc (&pool->mem, size);
assert (*ptr != NULL);
return pool;
cleanup_detach:
XShmDetach (dpy, &pool->shm);
cleanup_shm:
shmdt (pool->shm.shmaddr);
cleanup:
free (pool);
return NULL;
}
static cairo_xlib_shm_info_t *
_cairo_xlib_shm_info_create (cairo_xlib_display_t *display,
size_t size, cairo_bool_t will_sync)
{
cairo_xlib_shm_info_t *info;
cairo_xlib_shm_t *pool;
unsigned long last_request = 0;
void *mem = NULL;
if (will_sync) {
info = _cairo_xlib_shm_info_find (display, size, &last_request);
if (info)
return info;
}
_cairo_xlib_shm_info_cleanup (display);
pool = _cairo_xlib_shm_pool_find (display, size, &mem);
_cairo_xlib_shm_pool_cleanup (display);
if (pool == NULL)
pool = _cairo_xlib_shm_pool_create (display, size, &mem);
if (pool == NULL)
return NULL;
assert (mem != NULL);
info = malloc (sizeof (*info));
if (info == NULL) {
_cairo_mempool_free (&pool->mem, mem);
return NULL;
}
info->pool = pool;
info->mem = mem;
info->size = size;
info->last_request = last_request;
return info;
}
static cairo_status_t
_cairo_xlib_shm_surface_flush (void *abstract_surface, unsigned flags)
{
cairo_xlib_shm_surface_t *shm = abstract_surface;
cairo_xlib_display_t *display;
cairo_status_t status;
if (shm->active == 0)
return CAIRO_STATUS_SUCCESS;
if (shm->image.base._finishing)
return CAIRO_STATUS_SUCCESS;
if (seqno_passed (shm->active, peek_processed (shm->image.base.device))) {
shm->active = 0;
return CAIRO_STATUS_SUCCESS;
}
status = _cairo_xlib_display_acquire (shm->image.base.device, &display);
if (unlikely (status))
return status;
XEventsQueued (display->display, QueuedAfterReading);
if (!seqno_passed (shm->active,
LastKnownRequestProcessed (display->display)))
XSync (display->display, False);
cairo_device_release (&display->base);
shm->active = 0;
return CAIRO_STATUS_SUCCESS;
}
static inline cairo_bool_t
active (cairo_xlib_shm_surface_t *shm, Display *dpy)
{
return (shm->active &&
!seqno_passed (shm->active, LastKnownRequestProcessed (dpy)));
}
static cairo_status_t
_cairo_xlib_shm_surface_finish (void *abstract_surface)
{
cairo_xlib_shm_surface_t *shm = abstract_surface;
cairo_xlib_display_t *display;
cairo_status_t status;
status = _cairo_xlib_display_acquire (shm->image.base.device, &display);
if (unlikely (status))
return status;
if (shm->pixmap)
XFreePixmap (display->display, shm->pixmap);
if (active (shm, display->display)) {
shm->info->last_request = shm->active;
_pqueue_push (&display->shm->info, shm->info);
} else {
_cairo_mempool_free (&shm->info->pool->mem, shm->info->mem);
free (shm->info);
_cairo_xlib_shm_pool_cleanup (display);
}
cairo_list_del (&shm->link);
cairo_device_release (&display->base);
return CAIRO_STATUS_SUCCESS;
}
static const cairo_surface_backend_t cairo_xlib_shm_surface_backend = {
CAIRO_SURFACE_TYPE_IMAGE,
_cairo_xlib_shm_surface_finish,
_cairo_default_context_create,
_cairo_image_surface_create_similar,
NULL, /* create similar image */
_cairo_image_surface_map_to_image,
_cairo_image_surface_unmap_image,
_cairo_image_surface_source,
_cairo_image_surface_acquire_source_image,
_cairo_image_surface_release_source_image,
_cairo_image_surface_snapshot,
NULL, /* copy_page */
NULL, /* show_page */
_cairo_image_surface_get_extents,
_cairo_image_surface_get_font_options,
_cairo_xlib_shm_surface_flush,
NULL,
_cairo_image_surface_paint,
_cairo_image_surface_mask,
_cairo_image_surface_stroke,
_cairo_image_surface_fill,
NULL, /* fill-stroke */
_cairo_image_surface_glyphs,
};
static cairo_bool_t
has_shm (cairo_xlib_surface_t *surface)
{
cairo_xlib_display_t *display = (cairo_xlib_display_t *)surface->base.device;
return display->shm != NULL;
}
static int
has_shm_pixmaps (cairo_xlib_surface_t *surface)
{
cairo_xlib_display_t *display = (cairo_xlib_display_t *)surface->base.device;
if (!display->shm)
return 0;
return display->shm->has_pixmaps;
}
static cairo_xlib_shm_surface_t *
_cairo_xlib_shm_surface_create (cairo_xlib_surface_t *other,
pixman_format_code_t format,
int width, int height,
cairo_bool_t will_sync,
int create_pixmap)
{
cairo_xlib_shm_surface_t *shm;
cairo_xlib_display_t *display;
pixman_image_t *image;
int stride, size;
stride = CAIRO_STRIDE_FOR_WIDTH_BPP (width, PIXMAN_FORMAT_BPP(format));
size = stride * height;
if (size < MIN_SIZE)
return NULL;
shm = malloc (sizeof (*shm));
if (unlikely (shm == NULL))
return (cairo_xlib_shm_surface_t *)_cairo_surface_create_in_error (CAIRO_STATUS_NO_MEMORY);
_cairo_surface_init (&shm->image.base,
&cairo_xlib_shm_surface_backend,
other->base.device,
_cairo_content_from_pixman_format (format));
if (_cairo_xlib_display_acquire (other->base.device, &display))
goto cleanup_shm;
shm->info = _cairo_xlib_shm_info_create (display, size, will_sync);
if (shm->info == NULL)
goto cleanup_display;
image = pixman_image_create_bits (format, width, height,
(uint32_t *) shm->info->mem, stride);
if (image == NULL)
goto cleanup_info;
_cairo_image_surface_init (&shm->image, image, format);
shm->pixmap = 0;
if (create_pixmap && size >= create_pixmap) {
shm->pixmap = XShmCreatePixmap (display->display,
other->drawable,
shm->info->mem,
&shm->info->pool->shm,
shm->image.width,
shm->image.height,
shm->image.depth);
}
shm->active = shm->info->last_request;
shm->idle = -5;
assert (shm->active == 0 || will_sync);
cairo_list_add (&shm->link, &display->shm->surfaces);
cairo_device_release (&display->base);
return shm;
cleanup_info:
_cairo_mempool_free (&shm->info->pool->mem, shm->info->mem);
free(shm->info);
cleanup_display:
cairo_device_release (&display->base);
cleanup_shm:
free (shm);
return NULL;
}
static void
_cairo_xlib_surface_update_shm (cairo_xlib_surface_t *surface)
{
cairo_xlib_shm_surface_t *shm = (cairo_xlib_shm_surface_t *)surface->shm;
cairo_xlib_display_t *display;
cairo_damage_t *damage;
GC gc;
damage = _cairo_damage_reduce (surface->base.damage);
surface->base.damage = _cairo_damage_create();
if (_cairo_xlib_display_acquire (surface->base.device, &display))
goto cleanup_damage;
if (_cairo_xlib_surface_get_gc (display, surface, &gc))
goto cleanup_display;
if (! surface->owns_pixmap) {
XGCValues gcv;
gcv.subwindow_mode = IncludeInferiors;
XChangeGC (display->display, gc, GCSubwindowMode, &gcv);
}
if (damage->region) {
XRectangle stack_rects[CAIRO_STACK_ARRAY_LENGTH (sizeof (XRectangle))];
XRectangle *rects = stack_rects;
cairo_rectangle_int_t r;
int n_rects, i;
n_rects = cairo_region_num_rectangles (damage->region);
if (n_rects == 0) {
} else if (n_rects == 1) {
cairo_region_get_rectangle (damage->region, 0, &r);
XCopyArea (display->display,
surface->drawable, shm->pixmap, gc,
r.x, r.y,
r.width, r.height,
r.x, r.y);
} else {
if (n_rects > ARRAY_LENGTH (stack_rects)) {
rects = _cairo_malloc_ab (n_rects, sizeof (XRectangle));
if (unlikely (rects == NULL)) {
rects = stack_rects;
n_rects = ARRAY_LENGTH (stack_rects);
}
}
for (i = 0; i < n_rects; i++) {
cairo_region_get_rectangle (damage->region, i, &r);
rects[i].x = r.x;
rects[i].y = r.y;
rects[i].width = r.width;
rects[i].height = r.height;
}
XSetClipRectangles (display->display, gc, 0, 0, rects, i, YXBanded);
XCopyArea (display->display,
surface->drawable, shm->pixmap, gc,
0, 0,
shm->image.width, shm->image.height,
0, 0);
if (damage->status == CAIRO_STATUS_SUCCESS && damage->region)
XSetClipMask (display->display, gc, None);
}
} else {
XCopyArea (display->display,
surface->drawable, shm->pixmap, gc,
0, 0,
shm->image.width, shm->image.height,
0, 0);
}
if (! surface->owns_pixmap) {
XGCValues gcv;
gcv.subwindow_mode = ClipByChildren;
XChangeGC (display->display, gc, GCSubwindowMode, &gcv);
}
XSync (display->display, False);
shm->active = 0;
shm->idle--;
_cairo_xlib_surface_put_gc (display, surface, gc);
cleanup_display:
cairo_device_release (&display->base);
cleanup_damage:
_cairo_damage_destroy (damage);
}
static void
_cairo_xlib_surface_clear_shm (cairo_xlib_surface_t *surface)
{
cairo_xlib_shm_surface_t *shm = (cairo_xlib_shm_surface_t *)surface->shm;
assert (shm->active == 0);
_cairo_damage_destroy (surface->base.damage);
surface->base.damage = _cairo_damage_create();
memset (shm->image.data, 0, shm->image.stride * shm->image.height);
shm->image.base.is_clear = TRUE;
}
static void inc_idle (cairo_surface_t *surface)
{
cairo_xlib_shm_surface_t *shm = (cairo_xlib_shm_surface_t *)surface;
shm->idle++;
}
static void dec_idle (cairo_surface_t *surface)
{
cairo_xlib_shm_surface_t *shm = (cairo_xlib_shm_surface_t *)surface;
shm->idle--;
}
cairo_surface_t *
_cairo_xlib_surface_get_shm (cairo_xlib_surface_t *surface,
cairo_bool_t overwrite)
{
if (surface->fallback) {
assert (surface->base.damage);
assert (surface->shm);
assert (surface->shm->damage);
goto done;
}
if (surface->shm == NULL) {
pixman_format_code_t pixman_format;
cairo_bool_t will_sync;
if (! has_shm_pixmaps (surface))
return NULL;
if ((surface->width | surface->height) < 32)
return NULL;
pixman_format = _pixman_format_for_xlib_surface (surface);
if (pixman_format == 0)
return NULL;
will_sync = !surface->base.is_clear && !overwrite;
surface->shm =
&_cairo_xlib_shm_surface_create (surface, pixman_format,
surface->width, surface->height,
will_sync, 1)->image.base;
if (surface->shm == NULL)
return NULL;
assert (surface->base.damage == NULL);
if (surface->base.serial || !surface->owns_pixmap) {
cairo_rectangle_int_t rect;
rect.x = rect.y = 0;
rect.width = surface->width;
rect.height = surface->height;
surface->base.damage =
_cairo_damage_add_rectangle (NULL, &rect);
} else
surface->base.damage = _cairo_damage_create ();
surface->shm->damage = _cairo_damage_create ();
}
if (overwrite) {
_cairo_damage_destroy (surface->base.damage);
surface->base.damage = _cairo_damage_create ();
}
if (!surface->base.is_clear && surface->base.damage->dirty)
_cairo_xlib_surface_update_shm (surface);
_cairo_xlib_shm_surface_flush (surface->shm, 1);
if (surface->base.is_clear && surface->base.damage->dirty)
_cairo_xlib_surface_clear_shm (surface);
done:
dec_idle(surface->shm);
return surface->shm;
}
cairo_int_status_t
_cairo_xlib_surface_put_shm (cairo_xlib_surface_t *surface)
{
cairo_int_status_t status = CAIRO_INT_STATUS_SUCCESS;
if (!surface->fallback) {
if (surface->shm)
inc_idle (surface->shm);
return CAIRO_INT_STATUS_SUCCESS;