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1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 #include "ui/wayland/wayland_shm_buffer.h" | |
6 | |
7 #include <cairo.h> | |
8 #include <fcntl.h> | |
9 #include <stdlib.h> | |
10 #include <sys/mman.h> | |
11 #include <unistd.h> | |
12 #include <wayland-client.h> | |
13 | |
14 #include "base/logging.h" | |
15 #include "ui/wayland/wayland_display.h" | |
16 | |
17 namespace ui { | |
18 | |
19 WaylandShmBuffer::WaylandShmBuffer(WaylandDisplay* display, | |
20 uint32_t width, | |
21 uint32_t height) | |
22 : data_surface_(NULL) { | |
23 int stride = cairo_format_stride_for_width(CAIRO_FORMAT_ARGB32, width); | |
24 int allocation = stride * height; | |
25 | |
26 char filename[] = "/tmp/wayland-shm-XXXXXX"; | |
27 int fd = mkstemp(filename); | |
28 if (fd < 0) { | |
29 PLOG(ERROR) << "Failed to open"; | |
30 return; | |
31 } | |
32 if (ftruncate(fd, allocation) < 0) { | |
33 PLOG(ERROR) << "Failed to ftruncate"; | |
34 close(fd); | |
35 return; | |
36 } | |
37 | |
38 unsigned char* data = static_cast<unsigned char*>( | |
39 mmap(NULL, allocation, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0)); | |
40 unlink(filename); | |
41 | |
42 if (data == MAP_FAILED) { | |
43 PLOG(ERROR) << "Failed to mmap /dev/zero"; | |
44 close(fd); | |
45 return; | |
46 } | |
47 data_surface_ = cairo_image_surface_create_for_data( | |
48 data, CAIRO_FORMAT_ARGB32, width, height, stride); | |
49 buffer_ = wl_shm_create_buffer(display->shm(), fd, | |
50 width, height, stride, | |
51 WL_SHM_FORMAT_PREMULTIPLIED_ARGB32); | |
52 close(fd); | |
53 } | |
54 | |
55 WaylandShmBuffer::~WaylandShmBuffer() { | |
56 if (buffer_) { | |
57 wl_buffer_destroy(buffer_); | |
58 buffer_ = NULL; | |
59 } | |
60 if (data_surface_) { | |
61 cairo_surface_destroy(data_surface_); | |
62 data_surface_ = NULL; | |
63 } | |
64 } | |
65 | |
66 } // namespace ui | |
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