Adding a Wayland basic toolkit

ui/wayland/wayland_cursor.cc

+// 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 "wayland_cursor.h"
+#include "wayland_display.h"
+#include "wayland_shm_buffer.h"
+
+#include <cairo.h>
+#include <stdio.h>
+
+struct PointerImage {
+  const char* filename;
+  int hotspot_x, hotspot_y;
+};
+
+// TODO Add more pointer images and fix the path
+static const struct PointerImage pointer_images[] = {
+  {"left_ptr.png",        10, 5},
+  {"hand.png",            10, 5},
+};
+
+WaylandCursor::WaylandCursor(WaylandDisplay* display)
+    : display_(display),
+      buffer_(NULL) {
+}
+
+void WaylandCursor::ChangeCursor(WaylandCursorType type) {
+  const struct PointerImage *ptr = &pointer_images[type];
+
+  cairo_surface_t* ptr_surface = cairo_image_surface_create_from_png(
+      ptr->filename);
+
+  if (!ptr_surface) {
+    fprintf(stderr, "Failed to create cursor surface\n");
+    return;
+  }
+
+  int width = cairo_image_surface_get_width(ptr_surface);
+  int height = cairo_image_surface_get_height(ptr_surface);
+
+  if (buffer_) {
+    delete buffer_;
+  }
+
+  // TODO There should be a simpler way to create a wl_buffer for
+  // a cairo surface
+  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);
+}