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// Copyright (c) 2010 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/host/capturer_mac.h"
#include <stddef.h>
#include <OpenGL/CGLMacro.h>
#include "base/logging.h"
namespace remoting {
CapturerMac::CapturerMac(MessageLoop* message_loop)
: Capturer(message_loop),
cgl_context_(NULL) {
// TODO(dmaclach): move this initialization out into session_manager,
// or at least have session_manager call into here to initialize it.
CGError err =
CGRegisterScreenRefreshCallback(CapturerMac::ScreenRefreshCallback,
this);
DCHECK_EQ(err, kCGErrorSuccess);
err = CGScreenRegisterMoveCallback(CapturerMac::ScreenUpdateMoveCallback,
this);
DCHECK_EQ(err, kCGErrorSuccess);
err = CGDisplayRegisterReconfigurationCallback(
CapturerMac::DisplaysReconfiguredCallback, this);
DCHECK_EQ(err, kCGErrorSuccess);
ScreenConfigurationChanged();
}
CapturerMac::~CapturerMac() {
ReleaseBuffers();
CGUnregisterScreenRefreshCallback(CapturerMac::ScreenRefreshCallback, this);
CGScreenUnregisterMoveCallback(CapturerMac::ScreenUpdateMoveCallback, this);
CGDisplayRemoveReconfigurationCallback(
CapturerMac::DisplaysReconfiguredCallback, this);
}
void CapturerMac::ReleaseBuffers() {
if (cgl_context_) {
CGLDestroyContext(cgl_context_);
cgl_context_ = NULL;
}
}
void CapturerMac::ScreenConfigurationChanged() {
ReleaseBuffers();
CGDirectDisplayID mainDevice = CGMainDisplayID();
width_ = CGDisplayPixelsWide(mainDevice);
height_ = CGDisplayPixelsHigh(mainDevice);
pixel_format_ = media::VideoFrame::RGB32;
bytes_per_row_ = width_ * sizeof(uint32_t);
size_t buffer_size = height() * bytes_per_row_;
for (int i = 0; i < kNumBuffers; ++i) {
buffers_[i].reset(new uint8[buffer_size]);
}
CGLPixelFormatAttribute attributes[] = {
kCGLPFAFullScreen,
kCGLPFADisplayMask,
(CGLPixelFormatAttribute)CGDisplayIDToOpenGLDisplayMask(mainDevice),
(CGLPixelFormatAttribute)0
};
CGLPixelFormatObj pixel_format = NULL;
GLint matching_pixel_format_count = 0;
CGLError err = CGLChoosePixelFormat(attributes,
&pixel_format,
&matching_pixel_format_count);
DCHECK_EQ(err, kCGLNoError);
err = CGLCreateContext(pixel_format, NULL, &cgl_context_);
DCHECK_EQ(err, kCGLNoError);
CGLDestroyPixelFormat(pixel_format);
CGLSetFullScreen(cgl_context_);
CGLSetCurrentContext(cgl_context_);
}
void CapturerMac::CalculateInvalidRects() {
// Since the Mac gets its list of invalid rects via calls to InvalidateRect(),
// this step only needs to perform post-processing optimizations on the rect
// list (if needed).
}
void CapturerMac::CaptureRects(const InvalidRects& rects,
CaptureCompletedCallback* callback) {
// TODO(dmaclach): something smarter here in the future.
gfx::Rect dirtyRect;
for (InvalidRects::const_iterator i = rects.begin(); i != rects.end(); ++i) {
dirtyRect = dirtyRect.Union(*i);
}
CGLContextObj CGL_MACRO_CONTEXT = cgl_context_;
glReadBuffer(GL_FRONT);
glPushClientAttrib(GL_CLIENT_PIXEL_STORE_BIT);
glPixelStorei(GL_PACK_ALIGNMENT, 4); // Force 4-byte alignment.
glPixelStorei(GL_PACK_ROW_LENGTH, 0);
glPixelStorei(GL_PACK_SKIP_ROWS, 0);
glPixelStorei(GL_PACK_SKIP_PIXELS, 0);
// Read a block of pixels from the frame buffer.
glReadPixels(0, 0, width(), height(), GL_BGRA, GL_UNSIGNED_BYTE,
buffers_[current_buffer_].get());
glPopClientAttrib();
DataPlanes planes;
planes.data[0] = buffers_[current_buffer_].get();
planes.strides[0] = bytes_per_row_;
scoped_refptr<CaptureData> data(new CaptureData(planes,
width(),
height(),
pixel_format()));
data->mutable_dirty_rects().clear();
data->mutable_dirty_rects().insert(dirtyRect);
FinishCapture(data, callback);
}
void CapturerMac::ScreenRefresh(CGRectCount count, const CGRect *rect_array) {
InvalidRects rects;
for (CGRectCount i = 0; i < count; ++i) {
CGRect rect = rect_array[i];
rect.origin.y = height() - rect.size.height;
rects.insert(gfx::Rect(rect));
}
InvalidateRects(rects);
}
void CapturerMac::ScreenUpdateMove(CGScreenUpdateMoveDelta delta,
size_t count,
const CGRect *rect_array) {
InvalidRects rects;
for (CGRectCount i = 0; i < count; ++i) {
CGRect rect = rect_array[i];
rect.origin.y = height() - rect.size.height;
rects.insert(gfx::Rect(rect));
rect = CGRectOffset(rect, delta.dX, delta.dY);
rects.insert(gfx::Rect(rect));
}
InvalidateRects(rects);
}
void CapturerMac::ScreenRefreshCallback(CGRectCount count,
const CGRect *rect_array,
void *user_parameter) {
CapturerMac *capturer = reinterpret_cast<CapturerMac *>(user_parameter);
capturer->ScreenRefresh(count, rect_array);
}
void CapturerMac::ScreenUpdateMoveCallback(CGScreenUpdateMoveDelta delta,
size_t count,
const CGRect *rect_array,
void *user_parameter) {
CapturerMac *capturer = reinterpret_cast<CapturerMac *>(user_parameter);
capturer->ScreenUpdateMove(delta, count, rect_array);
}
void CapturerMac::DisplaysReconfiguredCallback(
CGDirectDisplayID display,
CGDisplayChangeSummaryFlags flags,
void *user_parameter) {
if ((display == CGMainDisplayID()) &&
!(flags & kCGDisplayBeginConfigurationFlag)) {
CapturerMac *capturer = reinterpret_cast<CapturerMac *>(user_parameter);
capturer->ScreenConfigurationChanged();
}
}
// static
Capturer* Capturer::Create(MessageLoop* message_loop) {
return new CapturerMac(message_loop);
}
} // namespace remoting
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