aura-x11: Add custom web cursor support.

webkit/glue/webcursor_aurax11.cc

+// Copyright (c) 2012 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 "webkit/glue/webcursor.h"
+
+#include <X11/Xlib.h>
+#include <X11/Xcursor/Xcursor.h>
+#include <X11/cursorfont.h>
+
+#include "base/logging.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebCursorInfo.h"
+#include "third_party/skia/include/core/SkUnPreMultiply.h"
+#include "ui/aura/cursor.h"
+#include "ui/base/x/x11_util.h"
+
+const gfx::PlatformCursor& WebCursor::GetPlatformCursor() {
+  if (platform_cursor_)
+    return platform_cursor_;
+
+  SkBitmap bitmap;
+  bitmap.setConfig(SkBitmap::kARGB_8888_Config,
+                   custom_size_.width(), custom_size_.height());
+  bitmap.allocPixels();
+  memcpy(bitmap.getAddr32(0, 0), custom_data_.data(), custom_data_.size());
+
+  XcursorImage* image =
+      XcursorImageCreate(custom_size_.width(), custom_size_.height());
+  image->xhot = hotspot_.x();
+  image->yhot = hotspot_.y();
+  uint32* pixels = image->pixels;
+
+  bitmap.lockPixels();
+  int height = bitmap.height(), width = bitmap.width();
+  for (int y = 0, i = 0; y < height; y++) {
+    for (int x = 0; x < width; x++) {
+      uint32 pixel = bitmap.getAddr32(0, y)[x];
+      int alpha = SkColorGetA(pixel);
+      if (alpha != 0 && alpha != 255)
+        pixels[i] = SkUnPreMultiply::PMColorToColor(pixel);
+      else
+        pixels[i] = pixel;
+      ++i;
+    }
+  }
+  bitmap.unlockPixels();
+
+  platform_cursor_ = ui::CreateReffedCustomXCursor(image);
+  return platform_cursor_;
+}
+
+void WebCursor::InitPlatformData() {
+  platform_cursor_ = 0;
+}
+
+bool WebCursor::SerializePlatformData(Pickle* pickle) const {
+  return true;
+}
+
+bool WebCursor::DeserializePlatformData(const Pickle* pickle, void** iter) {
+  return true;
+}
+
+bool WebCursor::IsPlatformDataEqual(const WebCursor& other) const {
+  return true;
+}
+
+void WebCursor::CleanupPlatformData() {
+  if (platform_cursor_) {
+    ui::UnrefCustomXCursor(platform_cursor_);
+    platform_cursor_ = 0;
+  }
+}
+
+void WebCursor::CopyPlatformData(const WebCursor& other) {
+  if (platform_cursor_)
+    ui::UnrefCustomXCursor(platform_cursor_);
+  platform_cursor_ = other.platform_cursor_;
+  if (platform_cursor_)
+    ui::RefCustomXCursor(platform_cursor_);
+}