[Chromoting] Initial plumbing for cursor shape.

remoting/client/plugin/chromoting_instance.cc

Index: remoting/client/plugin/chromoting_instance.cc
diff --git a/remoting/client/plugin/chromoting_instance.cc b/remoting/client/plugin/chromoting_instance.cc
index ddc6b97364cd191484cfc0ff1933299b898df4d6..2a2da9eaddeb39ffb5861bdcc6d658933f4b6282 100644
--- a/remoting/client/plugin/chromoting_instance.cc
+++ b/remoting/client/plugin/chromoting_instance.cc
@@ -23,6 +23,7 @@
 #include "media/base/media.h"
 #include "ppapi/cpp/completion_callback.h"
 #include "ppapi/cpp/input_event.h"
+#include "ppapi/cpp/mouse_cursor.h"
 #include "ppapi/cpp/rect.h"
 // TODO(wez): Remove this when crbug.com/86353 is complete.
 #include "ppapi/cpp/private/var_private.h"
@@ -51,6 +52,9 @@ namespace remoting {
 
 namespace {
 
+// 32-bit BGRA is 4 bytes per pixel.
+const int kBytesPerPixel = 4;
+
 const int kPerfStatsIntervalMs = 1000;
 
 std::string ConnectionStateToString(ChromotingInstance::ConnectionState state) {
@@ -556,6 +560,52 @@ void ChromotingInstance::InjectClipboardEvent(
   PostChromotingMessage("injectClipboardItem", data.Pass());
 }
 
+void ChromotingInstance::SetCursorShape(
+    const protocol::CursorShapeInfo& cursor_shape) {
+  if (!cursor_shape.has_data() ||
+      !cursor_shape.has_width() ||
+      !cursor_shape.has_height() ||
+      !cursor_shape.has_hotspot_x() ||
+      !cursor_shape.has_hotspot_y()) {
+    return;
+  }
+
+  if (pp::ImageData::GetNativeImageDataFormat() !=
+      PP_IMAGEDATAFORMAT_BGRA_PREMUL) {
+    VLOG(2) << "Unable to set cursor shape - non-native image format";
+    return;
+  }
+
+  int width = cursor_shape.width();
+  int height = cursor_shape.height();
+
+  if (width > 32 || height > 32) {
+    VLOG(2) << "Cursor too large for SetCursor: "
+            << width << "x" << height << " > 32x32";
+    return;
+  }
+
+  int hotspot_x = cursor_shape.hotspot_x();
+  int hotspot_y = cursor_shape.hotspot_y();
+
+  pp::ImageData cursor_image(this, PP_IMAGEDATAFORMAT_BGRA_PREMUL,
+                             pp::Size(width, height), false);
+
+  int bytes_per_row = width * kBytesPerPixel;
+  const uint8* src_row_data = reinterpret_cast<const uint8*>(
+      cursor_shape.data().data());
+  uint8* dst_row_data = reinterpret_cast<uint8*>(cursor_image.data());
+  for (int row = 0; row < height; row++) {
+    memcpy(dst_row_data, src_row_data, bytes_per_row);
+    src_row_data += bytes_per_row;
+    dst_row_data += cursor_image.stride();
+  }
+
+  pp::MouseCursor::SetCursor(this, PP_MOUSECURSOR_TYPE_CUSTOM,
+                             cursor_image,
+                             pp::Point(hotspot_x, hotspot_y));
+}
+
 // static
 void ChromotingInstance::RegisterLogMessageHandler() {
   base::AutoLock lock(g_logging_lock.Get());