1 // Copyright 2015 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/empty_cursor_filter.h" 6 7 #include <stdint.h> 8 9 #include <algorithm> 10 11 #include "build/build_config.h" 12 #include "remoting/proto/control.pb.h" 13 14 namespace remoting { 15 EmptyCursorShape()16protocol::CursorShapeInfo EmptyCursorShape() { 17 protocol::CursorShapeInfo empty_shape; 18 empty_shape.set_data(std::string()); 19 empty_shape.set_width(0); 20 empty_shape.set_height(0); 21 empty_shape.set_hotspot_x(0); 22 empty_shape.set_hotspot_y(0); 23 return empty_shape; 24 } 25 IsCursorShapeEmpty(const protocol::CursorShapeInfo & cursor_shape)26bool IsCursorShapeEmpty(const protocol::CursorShapeInfo& cursor_shape) { 27 return cursor_shape.width() <= 0 || cursor_shape.height() <= 0; 28 } 29 EmptyCursorFilter(protocol::CursorShapeStub * cursor_stub)30EmptyCursorFilter::EmptyCursorFilter(protocol::CursorShapeStub* cursor_stub) 31 : cursor_stub_(cursor_stub) { 32 } 33 34 EmptyCursorFilter::~EmptyCursorFilter() = default; 35 36 namespace { 37 38 #if defined(ARCH_CPU_LITTLE_ENDIAN) 39 const uint32_t kPixelAlphaMask = 0xff000000; 40 #else // !defined(ARCH_CPU_LITTLE_ENDIAN) 41 const uint32_t kPixelAlphaMask = 0x000000ff; 42 #endif // !defined(ARCH_CPU_LITTLE_ENDIAN) 43 44 // Returns true if |pixel| is not completely transparent. IsVisiblePixel(uint32_t pixel)45bool IsVisiblePixel(uint32_t pixel) { 46 return (pixel & kPixelAlphaMask) != 0; 47 } 48 49 // Returns true if there is at least one visible pixel in the given range. IsVisibleRow(const uint32_t * begin,const uint32_t * end)50bool IsVisibleRow(const uint32_t* begin, const uint32_t* end) { 51 return std::find_if(begin, end, &IsVisiblePixel) != end; 52 } 53 54 } // namespace 55 SetCursorShape(const protocol::CursorShapeInfo & cursor_shape)56void EmptyCursorFilter::SetCursorShape( 57 const protocol::CursorShapeInfo& cursor_shape) { 58 const uint32_t* src_row_data = reinterpret_cast<const uint32_t*>( 59 cursor_shape.data().data()); 60 const uint32_t* src_row_data_end = 61 src_row_data + cursor_shape.width() * cursor_shape.height(); 62 if (IsVisibleRow(src_row_data, src_row_data_end)) { 63 cursor_stub_->SetCursorShape(cursor_shape); 64 return; 65 } 66 cursor_stub_->SetCursorShape(EmptyCursorShape()); 67 } 68 69 } // namespace remoting 70