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/*
* Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "modules/desktop_capture/mouse_cursor_monitor.h"
#include <memory>
#include <ApplicationServices/ApplicationServices.h>
#include <Cocoa/Cocoa.h>
#include <CoreFoundation/CoreFoundation.h>
#include "api/scoped_refptr.h"
#include "modules/desktop_capture/desktop_capture_options.h"
#include "modules/desktop_capture/desktop_capture_types.h"
#include "modules/desktop_capture/desktop_frame.h"
#include "modules/desktop_capture/mac/desktop_configuration.h"
#include "modules/desktop_capture/mac/desktop_configuration_monitor.h"
#include "modules/desktop_capture/mac/window_list_utils.h"
#include "modules/desktop_capture/mouse_cursor.h"
#include "rtc_base/checks.h"
namespace webrtc {
namespace {
CGImageRef CreateScaledCGImage(CGImageRef image, int width, int height) {
// Create context, keeping original image properties.
CGColorSpaceRef colorspace = CGImageGetColorSpace(image);
CGContextRef context = CGBitmapContextCreate(nullptr,
width,
height,
CGImageGetBitsPerComponent(image),
width * DesktopFrame::kBytesPerPixel,
colorspace,
CGImageGetBitmapInfo(image));
if (!context) return nil;
// Draw image to context, resizing it.
CGContextDrawImage(context, CGRectMake(0, 0, width, height), image);
// Extract resulting image from context.
CGImageRef imgRef = CGBitmapContextCreateImage(context);
CGContextRelease(context);
return imgRef;
}
} // namespace
class MouseCursorMonitorMac : public MouseCursorMonitor {
public:
MouseCursorMonitorMac(const DesktopCaptureOptions& options,
CGWindowID window_id,
ScreenId screen_id);
~MouseCursorMonitorMac() override;
void Init(Callback* callback, Mode mode) override;
void Capture() override;
private:
static void DisplaysReconfiguredCallback(CGDirectDisplayID display,
CGDisplayChangeSummaryFlags flags,
void *user_parameter);
void DisplaysReconfigured(CGDirectDisplayID display,
CGDisplayChangeSummaryFlags flags);
void CaptureImage(float scale);
rtc::scoped_refptr<DesktopConfigurationMonitor> configuration_monitor_;
CGWindowID window_id_;
ScreenId screen_id_;
Callback* callback_ = NULL;
Mode mode_;
__strong NSImage* last_cursor_ = NULL;
};
MouseCursorMonitorMac::MouseCursorMonitorMac(const DesktopCaptureOptions& options,
CGWindowID window_id,
ScreenId screen_id)
: configuration_monitor_(options.configuration_monitor()),
window_id_(window_id),
screen_id_(screen_id),
mode_(SHAPE_AND_POSITION) {
RTC_DCHECK(window_id == kCGNullWindowID || screen_id == kInvalidScreenId);
}
MouseCursorMonitorMac::~MouseCursorMonitorMac() {}
void MouseCursorMonitorMac::Init(Callback* callback, Mode mode) {
RTC_DCHECK(!callback_);
RTC_DCHECK(callback);
callback_ = callback;
mode_ = mode;
}
void MouseCursorMonitorMac::Capture() {
RTC_DCHECK(callback_);
CGEventRef event = CGEventCreate(NULL);
CGPoint gc_position = CGEventGetLocation(event);
CFRelease(event);
DesktopVector position(gc_position.x, gc_position.y);
MacDesktopConfiguration configuration =
configuration_monitor_->desktop_configuration();
float scale = GetScaleFactorAtPosition(configuration, position);
CaptureImage(scale);
if (mode_ != SHAPE_AND_POSITION)
return;
// Always report cursor position in DIP pixel.
callback_->OnMouseCursorPosition(
position.subtract(configuration.bounds.top_left()));
}
void MouseCursorMonitorMac::CaptureImage(float scale) {
NSCursor* nscursor = [NSCursor currentSystemCursor];
NSImage* nsimage = [nscursor image];
if (nsimage == nil || !nsimage.isValid) {
return;
}
NSSize nssize = [nsimage size]; // DIP size
// No need to caputre cursor image if it's unchanged since last capture.
if (last_cursor_ && [[nsimage TIFFRepresentation] isEqual:[last_cursor_ TIFFRepresentation]]) return;
last_cursor_ = nsimage;
DesktopSize size(round(nssize.width * scale),
round(nssize.height * scale)); // Pixel size
NSPoint nshotspot = [nscursor hotSpot];
DesktopVector hotspot(
std::max(0,
std::min(size.width(), static_cast<int>(nshotspot.x * scale))),
std::max(0,
std::min(size.height(), static_cast<int>(nshotspot.y * scale))));
CGImageRef cg_image =
[nsimage CGImageForProposedRect:NULL context:nil hints:nil];
if (!cg_image)
return;
// Before 10.12, OSX may report 1X cursor on Retina screen. (See
// crbug.com/632995.) After 10.12, OSX may report 2X cursor on non-Retina
// screen. (See crbug.com/671436.) So scaling the cursor if needed.
CGImageRef scaled_cg_image = nil;
if (CGImageGetWidth(cg_image) != static_cast<size_t>(size.width())) {
scaled_cg_image = CreateScaledCGImage(cg_image, size.width(), size.height());
if (scaled_cg_image != nil) {
cg_image = scaled_cg_image;
}
}
if (CGImageGetBitsPerPixel(cg_image) != DesktopFrame::kBytesPerPixel * 8 ||
CGImageGetWidth(cg_image) != static_cast<size_t>(size.width()) ||
CGImageGetBitsPerComponent(cg_image) != 8) {
if (scaled_cg_image != nil) CGImageRelease(scaled_cg_image);
return;
}
CGDataProviderRef provider = CGImageGetDataProvider(cg_image);
CFDataRef image_data_ref = CGDataProviderCopyData(provider);
if (image_data_ref == NULL) {
if (scaled_cg_image != nil) CGImageRelease(scaled_cg_image);
return;
}
const uint8_t* src_data =
reinterpret_cast<const uint8_t*>(CFDataGetBytePtr(image_data_ref));
// Create a MouseCursor that describes the cursor and pass it to
// the client.
std::unique_ptr<DesktopFrame> image(
new BasicDesktopFrame(DesktopSize(size.width(), size.height())));
int src_stride = CGImageGetBytesPerRow(cg_image);
image->CopyPixelsFrom(src_data, src_stride, DesktopRect::MakeSize(size));
CFRelease(image_data_ref);
if (scaled_cg_image != nil) CGImageRelease(scaled_cg_image);
std::unique_ptr<MouseCursor> cursor(
new MouseCursor(image.release(), hotspot));
callback_->OnMouseCursor(cursor.release());
}
MouseCursorMonitor* MouseCursorMonitor::CreateForWindow(
const DesktopCaptureOptions& options, WindowId window) {
return new MouseCursorMonitorMac(options, window, kInvalidScreenId);
}
MouseCursorMonitor* MouseCursorMonitor::CreateForScreen(
const DesktopCaptureOptions& options,
ScreenId screen) {
return new MouseCursorMonitorMac(options, kCGNullWindowID, screen);
}
std::unique_ptr<MouseCursorMonitor> MouseCursorMonitor::Create(
const DesktopCaptureOptions& options) {
return std::unique_ptr<MouseCursorMonitor>(
CreateForScreen(options, kFullDesktopScreenId));
}
} // namespace webrtc
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