1 files changed, 292 insertions, 0 deletions
diff --git a/xorg-server/hw/xwayland/xwayland-shm.c b/xorg-server/hw/xwayland/xwayland-shm.c
new file mode 100644
index 000000000..2d0ce3eb6
--- /dev/null
+++ b/xorg-server/hw/xwayland/xwayland-shm.c
@@ -0,0 +1,292 @@
+/*
+ * Copyright © 2014 Intel Corporation
+ * Copyright © 2012 Collabora, Ltd.
+ *
+ * Permission to use, copy, modify, distribute, and sell this software
+ * and its documentation for any purpose is hereby granted without
+ * fee, provided that the above copyright notice appear in all copies
+ * and that both that copyright notice and this permission notice
+ * appear in supporting documentation, and that the name of the
+ * copyright holders not be used in advertising or publicity
+ * pertaining to distribution of the software without specific,
+ * written prior permission.  The copyright holders make no
+ * representations about the suitability of this software for any
+ * purpose.  It is provided "as is" without express or implied
+ * warranty.
+ *
+ * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
+ * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS, IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
+ * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
+ * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
+ * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
+ * SOFTWARE.
+ */
+
+#include "xwayland.h"
+
+#include <sys/mman.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <string.h>
+#include <stdlib.h>
+
+struct xwl_pixmap {
+    struct wl_buffer *buffer;
+    int fd;
+    void *data;
+    size_t size;
+};
+
+#ifndef HAVE_MKOSTEMP
+static int
+set_cloexec_or_close(int fd)
+{
+    long flags;
+
+    if (fd == -1)
+        return -1;
+
+    flags = fcntl(fd, F_GETFD);
+    if (flags == -1)
+        goto err;
+
+    if (fcntl(fd, F_SETFD, flags | FD_CLOEXEC) == -1)
+        goto err;
+
+    return fd;
+
+ err:
+    close(fd);
+    return -1;
+}
+#endif
+
+static int
+create_tmpfile_cloexec(char *tmpname)
+{
+    int fd;
+
+#ifdef HAVE_MKOSTEMP
+    fd = mkostemp(tmpname, O_CLOEXEC);
+    if (fd >= 0)
+        unlink(tmpname);
+#else
+    fd = mkstemp(tmpname);
+    if (fd >= 0) {
+        fd = set_cloexec_or_close(fd);
+        unlink(tmpname);
+    }
+#endif
+
+    return fd;
+}
+
+/*
+ * Create a new, unique, anonymous file of the given size, and
+ * return the file descriptor for it. The file descriptor is set
+ * CLOEXEC. The file is immediately suitable for mmap()'ing
+ * the given size at offset zero.
+ *
+ * The file should not have a permanent backing store like a disk,
+ * but may have if XDG_RUNTIME_DIR is not properly implemented in OS.
+ *
+ * The file name is deleted from the file system.
+ *
+ * The file is suitable for buffer sharing between processes by
+ * transmitting the file descriptor over Unix sockets using the
+ * SCM_RIGHTS methods.
+ *
+ * If the C library implements posix_fallocate(), it is used to
+ * guarantee that disk space is available for the file at the
+ * given size. If disk space is insufficent, errno is set to ENOSPC.
+ * If posix_fallocate() is not supported, program may receive
+ * SIGBUS on accessing mmap()'ed file contents instead.
+ */
+static int
+os_create_anonymous_file(off_t size)
+{
+    static const char template[] = "/weston-shared-XXXXXX";
+    const char *path;
+    char *name;
+    int fd;
+    int ret;
+
+    path = getenv("XDG_RUNTIME_DIR");
+    if (!path) {
+        errno = ENOENT;
+        return -1;
+    }
+
+    name = malloc(strlen(path) + sizeof(template));
+    if (!name)
+        return -1;
+
+    strcpy(name, path);
+    strcat(name, template);
+
+    fd = create_tmpfile_cloexec(name);
+
+    free(name);
+
+    if (fd < 0)
+        return -1;
+
+#ifdef HAVE_POSIX_FALLOCATE
+    ret = posix_fallocate(fd, 0, size);
+    if (ret != 0) {
+        close(fd);
+        errno = ret;
+        return -1;
+    }
+#else
+    ret = ftruncate(fd, size);
+    if (ret < 0) {
+        close(fd);
+        return -1;
+    }
+#endif
+
+    return fd;
+}
+
+static uint32_t
+shm_format_for_depth(int depth)
+{
+    switch (depth) {
+    case 32:
+        return WL_SHM_FORMAT_ARGB8888;
+    case 24:
+    default:
+        return WL_SHM_FORMAT_XRGB8888;
+#ifdef WL_SHM_FORMAT_RGB565
+    case 16:
+        /* XXX: Check run-time protocol version too */
+        return WL_SHM_FORMAT_RGB565;
+#endif
+    }
+}
+
+PixmapPtr
+xwl_shm_create_pixmap(ScreenPtr screen,
+                      int width, int height, int depth, unsigned int hint)
+{
+    PixmapPtr pixmap;
+    struct xwl_pixmap *xwl_pixmap;
+    size_t size, stride;
+
+    if (hint == CREATE_PIXMAP_USAGE_GLYPH_PICTURE ||
+        (width == 0 && height == 0) || depth < 15)
+        return fbCreatePixmap(screen, width, height, depth, hint);
+
+    pixmap = fbCreatePixmap(screen, 0, 0, depth, hint);
+    if (!pixmap)
+        return NULL;
+
+    xwl_pixmap = malloc(sizeof *xwl_pixmap);
+    if (xwl_pixmap == NULL)
+        goto err_destroy_pixmap;
+
+    stride = PixmapBytePad(width, depth);
+    size = stride * height;
+    xwl_pixmap->buffer = NULL;
+    xwl_pixmap->size = size;
+    xwl_pixmap->fd = os_create_anonymous_file(size);
+    if (xwl_pixmap->fd < 0)
+        goto err_free_xwl_pixmap;
+
+    xwl_pixmap->data = mmap(NULL, size, PROT_READ | PROT_WRITE,
+                                  MAP_SHARED, xwl_pixmap->fd, 0);
+    if (xwl_pixmap->data == MAP_FAILED)
+        goto err_close_fd;
+
+    if (!(*screen->ModifyPixmapHeader) (pixmap, width, height, depth,
+                                        BitsPerPixel(depth),
+                                        stride, xwl_pixmap->data))
+        goto err_munmap;
+
+    xwl_pixmap_set_private(pixmap, xwl_pixmap);
+
+    return pixmap;
+
+ err_munmap:
+    munmap(xwl_pixmap->data, size);
+ err_close_fd:
+    close(xwl_pixmap->fd);
+ err_free_xwl_pixmap:
+    free(xwl_pixmap);
+ err_destroy_pixmap:
+    fbDestroyPixmap(pixmap);
+
+    return NULL;
+}
+
+Bool
+xwl_shm_destroy_pixmap(PixmapPtr pixmap)
+{
+    struct xwl_pixmap *xwl_pixmap = xwl_pixmap_get(pixmap);
+
+    if (xwl_pixmap && pixmap->refcnt == 1) {
+        if (xwl_pixmap->buffer)
+            wl_buffer_destroy(xwl_pixmap->buffer);
+        munmap(xwl_pixmap->data, xwl_pixmap->size);
+        close(xwl_pixmap->fd);
+        free(xwl_pixmap);
+    }
+
+    return fbDestroyPixmap(pixmap);
+}
+
+struct wl_buffer *
+xwl_shm_pixmap_get_wl_buffer(PixmapPtr pixmap)
+{
+    struct xwl_screen *xwl_screen = xwl_screen_get(pixmap->drawable.pScreen);
+    struct xwl_pixmap *xwl_pixmap = xwl_pixmap_get(pixmap);
+    struct wl_shm_pool *pool;
+    uint32_t format;
+
+    if (xwl_pixmap->buffer)
+        return xwl_pixmap->buffer;
+
+    pool = wl_shm_create_pool(xwl_screen->shm,
+                              xwl_pixmap->fd, xwl_pixmap->size);
+
+    format = shm_format_for_depth(pixmap->drawable.depth);
+    xwl_pixmap->buffer = wl_shm_pool_create_buffer(pool, 0,
+                                                   pixmap->drawable.width,
+                                                   pixmap->drawable.height,
+                                                   pixmap->devKind, format);
+
+    wl_shm_pool_destroy(pool);
+
+    return xwl_pixmap->buffer;
+}
+
+Bool
+xwl_shm_create_screen_resources(ScreenPtr screen)
+{
+    struct xwl_screen *xwl_screen = xwl_screen_get(screen);
+    int ret;
+
+    screen->CreateScreenResources = xwl_screen->CreateScreenResources;
+    ret = (*screen->CreateScreenResources) (screen);
+    xwl_screen->CreateScreenResources = screen->CreateScreenResources;
+    screen->CreateScreenResources = xwl_shm_create_screen_resources;
+
+    if (!ret)
+        return ret;
+
+    if (xwl_screen->rootless)
+        screen->devPrivate =
+            fbCreatePixmap(screen, 0, 0, screen->rootDepth, 0);
+    else
+        screen->devPrivate =
+            xwl_shm_create_pixmap(screen, screen->width, screen->height,
+                                  screen->rootDepth,
+                                  CREATE_PIXMAP_USAGE_BACKING_PIXMAP);
+
+    return screen->devPrivate != NULL;
+}