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// Copyright 2015 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 "remoting/client/empty_cursor_filter.h"
#include <stdint.h>
#include <algorithm>
#include "build/build_config.h"
#include "remoting/proto/control.pb.h"
namespace remoting {
protocol::CursorShapeInfo EmptyCursorShape() {
protocol::CursorShapeInfo empty_shape;
empty_shape.set_data(std::string());
empty_shape.set_width(0);
empty_shape.set_height(0);
empty_shape.set_hotspot_x(0);
empty_shape.set_hotspot_y(0);
return empty_shape;
}
bool IsCursorShapeEmpty(const protocol::CursorShapeInfo& cursor_shape) {
return cursor_shape.width() <= 0 || cursor_shape.height() <= 0;
}
EmptyCursorFilter::EmptyCursorFilter(protocol::CursorShapeStub* cursor_stub)
: cursor_stub_(cursor_stub) {
}
EmptyCursorFilter::~EmptyCursorFilter() {}
namespace {
#if defined(ARCH_CPU_LITTLE_ENDIAN)
const uint32_t kPixelAlphaMask = 0xff000000;
#else // !defined(ARCH_CPU_LITTLE_ENDIAN)
const uint32_t kPixelAlphaMask = 0x000000ff;
#endif // !defined(ARCH_CPU_LITTLE_ENDIAN)
// Returns true if |pixel| is not completely transparent.
bool IsVisiblePixel(uint32_t pixel) {
return (pixel & kPixelAlphaMask) != 0;
}
// Returns true if there is at least one visible pixel in the given range.
bool IsVisibleRow(const uint32_t* begin, const uint32_t* end) {
return std::find_if(begin, end, &IsVisiblePixel) != end;
}
} // namespace
void EmptyCursorFilter::SetCursorShape(
const protocol::CursorShapeInfo& cursor_shape) {
const uint32_t* src_row_data = reinterpret_cast<const uint32_t*>(
cursor_shape.data().data());
const uint32_t* src_row_data_end =
src_row_data + cursor_shape.width() * cursor_shape.height();
if (IsVisibleRow(src_row_data, src_row_data_end)) {
cursor_stub_->SetCursorShape(cursor_shape);
return;
}
cursor_stub_->SetCursorShape(EmptyCursorShape());
}
} // namespace remoting
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