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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "remoting/host/desktop_resizer.h"
#include <Carbon/Carbon.h>
#include <stdint.h>
#include "base/apple/foundation_util.h"
#include "base/apple/scoped_cftyperef.h"
#include "base/mac/mac_util.h"
#include "base/memory/ptr_util.h"
#include "base/notimplemented.h"
#include "remoting/base/logging.h"
namespace {
// TODO(jamiewalch): Use the correct DPI for the mode: http://crbug.com/172405.
const int kDefaultDPI = 96;
} // namespace
namespace remoting {
class DesktopResizerMac : public DesktopResizer {
public:
DesktopResizerMac() = default;
DesktopResizerMac(const DesktopResizerMac&) = delete;
DesktopResizerMac& operator=(const DesktopResizerMac&) = delete;
// DesktopResizer interface
ScreenResolution GetCurrentResolution(webrtc::ScreenId screen_id) override;
std::list<ScreenResolution> GetSupportedResolutions(
const ScreenResolution& preferred,
webrtc::ScreenId screen_id) override;
void SetResolution(const ScreenResolution& resolution,
webrtc::ScreenId screen_id) override;
void RestoreResolution(const ScreenResolution& original,
webrtc::ScreenId screen_id) override;
void SetVideoLayout(const protocol::VideoLayout& layout) override;
private:
// If there is a single display, get its id and return true, otherwise return
// false. We don't currently support resize-to-client on multi-monitor Macs.
bool GetSoleDisplayId(CGDirectDisplayID* display);
void GetSupportedModesAndResolutions(
base::apple::ScopedCFTypeRef<CFMutableArrayRef>* modes,
std::list<ScreenResolution>* resolutions);
};
ScreenResolution DesktopResizerMac::GetCurrentResolution(
webrtc::ScreenId screen_id) {
CGDirectDisplayID display;
if (GetSoleDisplayId(&display)) {
CGRect rect = CGDisplayBounds(display);
return ScreenResolution(
webrtc::DesktopSize(rect.size.width, rect.size.height),
webrtc::DesktopVector(kDefaultDPI, kDefaultDPI));
}
return ScreenResolution();
}
std::list<ScreenResolution> DesktopResizerMac::GetSupportedResolutions(
const ScreenResolution& preferred,
webrtc::ScreenId screen_id) {
base::apple::ScopedCFTypeRef<CFMutableArrayRef> modes;
std::list<ScreenResolution> resolutions;
GetSupportedModesAndResolutions(&modes, &resolutions);
return resolutions;
}
void DesktopResizerMac::SetResolution(const ScreenResolution& resolution,
webrtc::ScreenId screen_id) {
CGDirectDisplayID display;
if (!GetSoleDisplayId(&display)) {
return;
}
base::apple::ScopedCFTypeRef<CFMutableArrayRef> modes;
std::list<ScreenResolution> resolutions;
GetSupportedModesAndResolutions(&modes, &resolutions);
// There may be many modes with the requested resolution. Pick the one with
// the highest color depth.
int index = 0, best_depth = 0;
CGDisplayModeRef best_mode = nullptr;
for (std::list<ScreenResolution>::const_iterator i = resolutions.begin();
i != resolutions.end(); ++i, ++index) {
if (i->Equals(resolution)) {
CGDisplayModeRef mode =
const_cast<CGDisplayModeRef>(static_cast<const CGDisplayMode*>(
CFArrayGetValueAtIndex(modes.get(), index)));
int depth = 0;
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wdeprecated-declarations"
// TODO(crbug.com/40248574): Find non-deprecated replacement.
base::apple::ScopedCFTypeRef<CFStringRef> encoding(
CGDisplayModeCopyPixelEncoding(mode));
#pragma clang diagnostic pop
if (CFStringCompare(encoding.get(), CFSTR(IO32BitDirectPixels),
kCFCompareCaseInsensitive) == kCFCompareEqualTo) {
depth = 32;
} else if (CFStringCompare(encoding.get(), CFSTR(IO16BitDirectPixels),
kCFCompareCaseInsensitive) ==
kCFCompareEqualTo) {
depth = 16;
} else if (CFStringCompare(encoding.get(), CFSTR(IO8BitIndexedPixels),
kCFCompareCaseInsensitive) ==
kCFCompareEqualTo) {
depth = 8;
}
if (depth > best_depth) {
best_depth = depth;
best_mode = mode;
}
}
}
if (best_mode) {
HOST_LOG << "Changing mode to " << best_mode << " ("
<< resolution.dimensions().width() << "x"
<< "x" << resolution.dimensions().height() << "x" << best_depth
<< " @ " << resolution.dpi().x() << "x" << resolution.dpi().y()
<< " dpi)";
CGDisplaySetDisplayMode(display, best_mode, nullptr);
}
}
void DesktopResizerMac::RestoreResolution(const ScreenResolution& original,
webrtc::ScreenId screen_id) {
SetResolution(original, screen_id);
}
void DesktopResizerMac::SetVideoLayout(const protocol::VideoLayout& layout) {
NOTIMPLEMENTED();
}
void DesktopResizerMac::GetSupportedModesAndResolutions(
base::apple::ScopedCFTypeRef<CFMutableArrayRef>* modes,
std::list<ScreenResolution>* resolutions) {
CGDirectDisplayID display;
if (!GetSoleDisplayId(&display)) {
return;
}
base::apple::ScopedCFTypeRef<CFArrayRef> all_modes(
CGDisplayCopyAllDisplayModes(display, nullptr));
if (!all_modes) {
return;
}
modes->reset(CFArrayCreateMutableCopy(nullptr, 0, all_modes.get()));
CFIndex count = CFArrayGetCount(modes->get());
for (CFIndex i = 0; i < count; ++i) {
CGDisplayModeRef mode =
const_cast<CGDisplayModeRef>(static_cast<const CGDisplayMode*>(
CFArrayGetValueAtIndex(modes->get(), i)));
if (CGDisplayModeIsUsableForDesktopGUI(mode)) {
// TODO(jamiewalch): Get the correct DPI: http://crbug.com/172405.
ScreenResolution resolution(
webrtc::DesktopSize(CGDisplayModeGetWidth(mode),
CGDisplayModeGetHeight(mode)),
webrtc::DesktopVector(kDefaultDPI, kDefaultDPI));
resolutions->push_back(resolution);
} else {
CFArrayRemoveValueAtIndex(modes->get(), i);
--count;
--i;
}
}
}
bool DesktopResizerMac::GetSoleDisplayId(CGDirectDisplayID* display) {
// This code only supports a single display, but allocates space for two
// to allow the multi-monitor case to be detected.
CGDirectDisplayID displays[2];
uint32_t num_displays;
CGError err =
CGGetActiveDisplayList(std::size(displays), displays, &num_displays);
if (err != kCGErrorSuccess || num_displays != 1) {
return false;
}
*display = displays[0];
return true;
}
std::unique_ptr<DesktopResizer> DesktopResizer::Create() {
return base::WrapUnique(new DesktopResizerMac);
}
} // namespace remoting
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