remoting/client/plugin/pepper_cursor_setter.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "remoting/client/plugin/pepper_cursor_setter.h"
   6
   7 #include "base/logging.h"
   8 #include "ppapi/cpp/image_data.h"
   9 #include "ppapi/cpp/mouse_cursor.h"
  10 #include "remoting/client/plugin/empty_cursor_filter.h"
  11 #include "remoting/proto/control.pb.h"
  12
  13 namespace remoting {
  14
  15 PepperCursorSetter::PepperCursorSetter(const pp::InstanceHandle& instance)
  16     : instance_(instance), delegate_stub_(nullptr) {
  17 }
  18
  19 PepperCursorSetter::~PepperCursorSetter() {}
  20
  21 void PepperCursorSetter::SetCursorShape(
  22     const protocol::CursorShapeInfo& cursor_shape) {
  23   if (SetInstanceCursor(cursor_shape)) {
  24     // PPAPI cursor was set successfully, so clear delegate cursor, if any.
  25     if (delegate_stub_) {
  26       delegate_stub_->SetCursorShape(EmptyCursorShape());
  27     }
  28   } else if (delegate_stub_) {
  29     // Clear PPAPI cursor and fall-back to rendering cursor via delegate.
  30     pp::MouseCursor::SetCursor(instance_, PP_MOUSECURSOR_TYPE_NONE);
  31     delegate_stub_->SetCursorShape(cursor_shape);
  32   } else {
  33     // TODO(wez): Fall-back to cropping & re-trying the cursor iff there is no
  34     // delegate and the cursor is >32x32?
  35     DLOG(FATAL) << "Failed to set PPAPI cursor, and no delegate provided.";
  36   }
  37 }
  38
  39 bool PepperCursorSetter::SetInstanceCursor(
  40     const protocol::CursorShapeInfo& cursor_shape) {
  41   // If the cursor is empty then tell PPAPI there is no cursor.
  42   if (IsCursorShapeEmpty(cursor_shape)) {
  43     pp::MouseCursor::SetCursor(instance_, PP_MOUSECURSOR_TYPE_NONE);
  44     return true;
  45   }
  46
  47   // pp::MouseCursor requires image to be in the native format.
  48   if (pp::ImageData::GetNativeImageDataFormat() !=
  49       PP_IMAGEDATAFORMAT_BGRA_PREMUL) {
  50     LOG(WARNING) << "Unable to set cursor shape - native image format is not"
  51                     " premultiplied BGRA";
  52     return false;
  53   }
  54
  55   // Create a new ImageData to pass to SetCursor().
  56   pp::Size size(cursor_shape.width(), cursor_shape.height());
  57   pp::Point hotspot(cursor_shape.hotspot_x(), cursor_shape.hotspot_y());
  58   pp::ImageData image(instance_, PP_IMAGEDATAFORMAT_BGRA_PREMUL, size, false);
  59   if (image.is_null()) {
  60     LOG(WARNING) << "Unable to create cursor image";
  61     return false;
  62   }
  63
  64   // Fill the pixel data and pass the cursor to PPAPI to set.
  65   const int kBytesPerPixel = sizeof(uint32_t);
  66   const uint32_t* src_row_data = reinterpret_cast<const uint32_t*>(
  67       cursor_shape.data().data());
  68   const int bytes_per_row = size.width() * kBytesPerPixel;
  69   uint8* dst_row_data = reinterpret_cast<uint8*>(image.data());
  70   for (int row = 0; row < size.height(); row++) {
  71     memcpy(dst_row_data, src_row_data, bytes_per_row);
  72     src_row_data += size.width();
  73     dst_row_data += image.stride();
  74   }
  75
  76   return pp::MouseCursor::SetCursor(
  77       instance_, PP_MOUSECURSOR_TYPE_CUSTOM, image, hotspot);
  78 }
  79
  80 }  // namespace remoting