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/*
* Copyright (c) 2018 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/mac/desktop_frame_iosurface.h"
#include "rtc_base/checks.h"
#include "rtc_base/logging.h"
#include "rtc_base/numerics/safe_conversions.h"
namespace webrtc {
// static
std::unique_ptr<DesktopFrameIOSurface> DesktopFrameIOSurface::Wrap(
webrtc::ScopedCFTypeRef<IOSurfaceRef> io_surface, CGRect rect) {
if (!io_surface) {
return nullptr;
}
IOSurfaceIncrementUseCount(io_surface.get());
IOReturn status =
IOSurfaceLock(io_surface.get(), kIOSurfaceLockReadOnly, nullptr);
if (status != kIOReturnSuccess) {
RTC_LOG(LS_ERROR) << "Failed to lock the IOSurface with status " << status;
IOSurfaceDecrementUseCount(io_surface.get());
return nullptr;
}
// Verify that the image has 32-bit depth.
int bytes_per_pixel = IOSurfaceGetBytesPerElement(io_surface.get());
if (bytes_per_pixel != DesktopFrame::kBytesPerPixel) {
RTC_LOG(LS_ERROR) << "CGDisplayStream handler returned IOSurface with "
<< (8 * bytes_per_pixel)
<< " bits per pixel. Only 32-bit depth is supported.";
IOSurfaceUnlock(io_surface.get(), kIOSurfaceLockReadOnly, nullptr);
IOSurfaceDecrementUseCount(io_surface.get());
return nullptr;
}
const size_t surface_width = IOSurfaceGetWidth(io_surface.get());
const size_t surface_height = IOSurfaceGetHeight(io_surface.get());
const int32_t stride =
checked_cast<int32_t>(IOSurfaceGetBytesPerRow(io_surface.get()));
uint8_t* const data =
static_cast<uint8_t*>(IOSurfaceGetBaseAddress(io_surface.get()));
int32_t width = checked_cast<int32_t>(surface_width);
int32_t height = checked_cast<int32_t>(surface_height);
ptrdiff_t offset = 0;
ptrdiff_t offset_columns = 0;
ptrdiff_t offset_rows = 0;
if (rect.size.width > 0 && rect.size.height > 0) {
width = checked_cast<int32_t>(std::floor(rect.size.width));
height = checked_cast<int32_t>(std::floor(rect.size.height));
offset_columns = checked_cast<ptrdiff_t>(std::ceil(rect.origin.x));
offset_rows = checked_cast<ptrdiff_t>(std::ceil(rect.origin.y));
offset = stride * offset_rows + bytes_per_pixel * offset_columns;
}
RTC_LOG(LS_VERBOSE) << "DesktopFrameIOSurface wrapping IOSurface with size "
<< surface_width << "x" << surface_height
<< ". Cropping to (" << offset_columns << ","
<< offset_rows << "; " << width << "x" << height
<< "). Stride=" << stride / bytes_per_pixel
<< ", buffer-offset-px=" << offset / bytes_per_pixel
<< ", buffer-offset-bytes=" << offset;
RTC_CHECK_GE(surface_width, offset_columns + width);
RTC_CHECK_GE(surface_height, offset_rows + height);
RTC_CHECK_GE(offset, 0);
RTC_CHECK_LE(offset + ((height - 1) * stride) + (width * bytes_per_pixel) - 1,
IOSurfaceGetAllocSize(io_surface.get()));
return std::unique_ptr<DesktopFrameIOSurface>(new DesktopFrameIOSurface(
io_surface, data + offset, width, height, stride));
}
DesktopFrameIOSurface::DesktopFrameIOSurface(
webrtc::ScopedCFTypeRef<IOSurfaceRef> io_surface,
uint8_t* data,
int32_t width,
int32_t height,
int32_t stride)
: DesktopFrame(DesktopSize(width, height), stride, data, nullptr),
io_surface_(io_surface) {
RTC_DCHECK(io_surface_);
}
DesktopFrameIOSurface::~DesktopFrameIOSurface() {
IOSurfaceUnlock(io_surface_.get(), kIOSurfaceLockReadOnly, nullptr);
IOSurfaceDecrementUseCount(io_surface_.get());
}
} // namespace webrtc
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