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/*
* Copyright (c) 2016 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/desktop_frame_generator.h"
#include <stdint.h>
#include <string.h>
#include <memory>
#include "modules/desktop_capture/rgba_color.h"
#include "rtc_base/checks.h"
#include "rtc_base/random.h"
#include "rtc_base/time_utils.h"
namespace webrtc {
namespace {
// Sets `updated_region` to `frame`. If `enlarge_updated_region` is
// true, this function will randomly enlarge each DesktopRect in
// `updated_region`. But the enlarged DesktopRegion won't excceed the
// frame->size(). If `add_random_updated_region` is true, several random
// rectangles will also be included in `frame`.
void SetUpdatedRegion(DesktopFrame* frame,
const DesktopRegion& updated_region,
bool enlarge_updated_region,
int enlarge_range,
bool add_random_updated_region) {
const DesktopRect screen_rect = DesktopRect::MakeSize(frame->size());
Random random(TimeMicros());
frame->mutable_updated_region()->Clear();
for (DesktopRegion::Iterator it(updated_region); !it.IsAtEnd();
it.Advance()) {
DesktopRect rect = it.rect();
if (enlarge_updated_region && enlarge_range > 0) {
rect.Extend(random.Rand(enlarge_range), random.Rand(enlarge_range),
random.Rand(enlarge_range), random.Rand(enlarge_range));
rect.IntersectWith(screen_rect);
}
frame->mutable_updated_region()->AddRect(rect);
}
if (add_random_updated_region) {
for (int i = random.Rand(10); i >= 0; i--) {
// At least a 1 x 1 updated region.
const int left = random.Rand(0, frame->size().width() - 2);
const int top = random.Rand(0, frame->size().height() - 2);
const int right = random.Rand(left + 1, frame->size().width());
const int bottom = random.Rand(top + 1, frame->size().height());
frame->mutable_updated_region()->AddRect(
DesktopRect::MakeLTRB(left, top, right, bottom));
}
}
}
// Paints pixels in `rect` of `frame` to `color`.
void PaintRect(DesktopFrame* frame, DesktopRect rect, RgbaColor rgba_color) {
static_assert(DesktopFrame::kBytesPerPixel == sizeof(uint32_t),
"kBytesPerPixel should be 4.");
RTC_DCHECK_GE(frame->size().width(), rect.right());
RTC_DCHECK_GE(frame->size().height(), rect.bottom());
uint32_t color = rgba_color.ToUInt32();
uint8_t* row = frame->GetFrameDataAtPos(rect.top_left());
for (int i = 0; i < rect.height(); i++) {
uint32_t* column = reinterpret_cast<uint32_t*>(row);
for (int j = 0; j < rect.width(); j++) {
column[j] = color;
}
row += frame->stride();
}
}
// Paints pixels in `region` of `frame` to `color`.
void PaintRegion(DesktopFrame* frame,
DesktopRegion* region,
RgbaColor rgba_color) {
region->IntersectWith(DesktopRect::MakeSize(frame->size()));
for (DesktopRegion::Iterator it(*region); !it.IsAtEnd(); it.Advance()) {
PaintRect(frame, it.rect(), rgba_color);
}
}
} // namespace
DesktopFrameGenerator::DesktopFrameGenerator() {}
DesktopFrameGenerator::~DesktopFrameGenerator() {}
DesktopFramePainter::DesktopFramePainter() {}
DesktopFramePainter::~DesktopFramePainter() {}
PainterDesktopFrameGenerator::PainterDesktopFrameGenerator()
: size_(1024, 768),
return_frame_(true),
provide_updated_region_hints_(false),
enlarge_updated_region_(false),
enlarge_range_(20),
add_random_updated_region_(false),
painter_(nullptr) {}
PainterDesktopFrameGenerator::~PainterDesktopFrameGenerator() {}
std::unique_ptr<DesktopFrame> PainterDesktopFrameGenerator::GetNextFrame(
SharedMemoryFactory* factory) {
if (!return_frame_) {
return nullptr;
}
std::unique_ptr<DesktopFrame> frame = std::unique_ptr<DesktopFrame>(
factory ? SharedMemoryDesktopFrame::Create(size_, factory).release()
: new BasicDesktopFrame(size_));
if (painter_) {
DesktopRegion updated_region;
if (!painter_->Paint(frame.get(), &updated_region)) {
return nullptr;
}
if (provide_updated_region_hints_) {
SetUpdatedRegion(frame.get(), updated_region, enlarge_updated_region_,
enlarge_range_, add_random_updated_region_);
} else {
frame->mutable_updated_region()->SetRect(
DesktopRect::MakeSize(frame->size()));
}
}
return frame;
}
DesktopSize* PainterDesktopFrameGenerator::size() {
return &size_;
}
void PainterDesktopFrameGenerator::set_return_frame(bool return_frame) {
return_frame_ = return_frame;
}
void PainterDesktopFrameGenerator::set_provide_updated_region_hints(
bool provide_updated_region_hints) {
provide_updated_region_hints_ = provide_updated_region_hints;
}
void PainterDesktopFrameGenerator::set_enlarge_updated_region(
bool enlarge_updated_region) {
enlarge_updated_region_ = enlarge_updated_region;
}
void PainterDesktopFrameGenerator::set_enlarge_range(int enlarge_range) {
enlarge_range_ = enlarge_range;
}
void PainterDesktopFrameGenerator::set_add_random_updated_region(
bool add_random_updated_region) {
add_random_updated_region_ = add_random_updated_region;
}
void PainterDesktopFrameGenerator::set_desktop_frame_painter(
DesktopFramePainter* painter) {
painter_ = painter;
}
BlackWhiteDesktopFramePainter::BlackWhiteDesktopFramePainter() {}
BlackWhiteDesktopFramePainter::~BlackWhiteDesktopFramePainter() {}
DesktopRegion* BlackWhiteDesktopFramePainter::updated_region() {
return &updated_region_;
}
bool BlackWhiteDesktopFramePainter::Paint(DesktopFrame* frame,
DesktopRegion* updated_region) {
RTC_DCHECK(updated_region->is_empty());
memset(frame->data(), 0, frame->stride() * frame->size().height());
PaintRegion(frame, &updated_region_, RgbaColor(0xFFFFFFFF));
updated_region_.Swap(updated_region);
return true;
}
} // namespace webrtc
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