Adding a Wayland basic toolkit

ui/wayland/wayland_cursor.cc

Index: ui/wayland/wayland_cursor.cc
diff --git a/ui/wayland/wayland_cursor.cc b/ui/wayland/wayland_cursor.cc
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index 0000000000000000000000000000000000000000..998574d85cdebc67ddf1c5058838ea8c63de6ec4
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+++ b/ui/wayland/wayland_cursor.cc
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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_cursor.h"
+
+#include <cairo.h>
+
+#include "base/logging.h"
+#include "ui/wayland/wayland_display.h"
+#include "ui/wayland/wayland_shm_buffer.h"
+
+namespace {
+
+struct PointerImage {
+  const char* filename;
+  int hotspot_x, hotspot_y;
+};
+
+// TODO(dnicoara) Add more pointer images and fix the path
+static const struct PointerImage kPointerImages[] = {
+  {"left_ptr.png",        10, 5},
+  {"hand.png",            10, 5},
+};
+
+} // namespace
+
+WaylandCursor::WaylandCursor(WaylandDisplay* display)
+    : display_(display),
+      buffer_(NULL) {
+}
+
+WaylandCursor::~WaylandCursor() {
+  if (buffer_) {
+    delete buffer_;
+    buffer_ = NULL;
+  }
+}
+
+void WaylandCursor::ChangeCursor(WaylandCursorType type) {
+  const struct PointerImage *ptr = &kPointerImages[type];
+
+  cairo_surface_t* ptr_surface = cairo_image_surface_create_from_png(
+      ptr->filename);
+
+  if (!ptr_surface) {
+    LOG(ERROR) << "Failed to create cursor surface";
+    return;
+  }
+
+  int width = cairo_image_surface_get_width(ptr_surface);
+  int height = cairo_image_surface_get_height(ptr_surface);
+
+  if (buffer_) {
+    delete buffer_;
+    buffer_ = NULL;
+  }
+
+  // TODO(dnicoara) There should be a simpler way to create a wl_buffer for
+  // a cairo surface. Meantime we just copy the contents of the cairo surface
+  // created from file to the cairo surface created using a shm file.
+  buffer_ = new WaylandShmBuffer(display_, width, height);
+  cairo_surface_t* shared_surface = buffer_->GetDataSurface();
+
+  cairo_t* cr = cairo_create(shared_surface);
+  cairo_set_source_surface(cr, ptr_surface, 0, 0);
+  cairo_rectangle(cr, 0, 0, width, height);
+  cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
+  cairo_fill(cr);
+
+  display_->SetCursor(buffer_, ptr->hotspot_x, ptr->hotspot_y);
+}