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// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/wayland/wayland_shm_buffer.h"
#include <cairo.h>
#include <fcntl.h>
#include <stdlib.h>
#include <sys/mman.h>
#include <unistd.h>
#include <wayland-client.h>
#include "base/logging.h"
#include "ui/wayland/wayland_display.h"
namespace ui {
WaylandShmBuffer::WaylandShmBuffer(WaylandDisplay* display,
uint32_t width,
uint32_t height)
: data_surface_(NULL) {
int stride = cairo_format_stride_for_width(CAIRO_FORMAT_ARGB32, width);
int allocation = stride * height;
char filename[] = "/tmp/wayland-shm-XXXXXX";
int fd = mkstemp(filename);
if (fd < 0) {
PLOG(ERROR) << "Failed to open";
return;
}
if (ftruncate(fd, allocation) < 0) {
PLOG(ERROR) << "Failed to ftruncate";
close(fd);
return;
}
unsigned char* data = static_cast<unsigned char*>(
mmap(NULL, allocation, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0));
unlink(filename);
if (data == MAP_FAILED) {
PLOG(ERROR) << "Failed to mmap /dev/zero";
close(fd);
return;
}
data_surface_ = cairo_image_surface_create_for_data(
data, CAIRO_FORMAT_ARGB32, width, height, stride);
buffer_ = wl_shm_create_buffer(display->shm(), fd,
width, height, stride,
WL_SHM_FORMAT_PREMULTIPLIED_ARGB32);
close(fd);
}
WaylandShmBuffer::~WaylandShmBuffer() {
if (buffer_) {
wl_buffer_destroy(buffer_);
buffer_ = NULL;
}
if (data_surface_) {
cairo_surface_destroy(data_surface_);
data_surface_ = NULL;
}
}
} // namespace ui
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