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// Copyright (c) 2012 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 "media/video/capture/screen/screen_capturer_fake.h"
#include "base/time.h"
#include "media/video/capture/screen/screen_capture_data.h"
namespace media {
// ScreenCapturerFake generates a white picture of size kWidth x kHeight
// with a rectangle of size kBoxWidth x kBoxHeight. The rectangle moves kSpeed
// pixels per frame along both axes, and bounces off the sides of the screen.
static const int kWidth = ScreenCapturerFake::kWidth;
static const int kHeight = ScreenCapturerFake::kHeight;
static const int kBoxWidth = 140;
static const int kBoxHeight = 140;
static const int kSpeed = 20;
COMPILE_ASSERT(kBoxWidth < kWidth && kBoxHeight < kHeight, bad_box_size);
COMPILE_ASSERT((kBoxWidth % kSpeed == 0) && (kWidth % kSpeed == 0) &&
(kBoxHeight % kSpeed == 0) && (kHeight % kSpeed == 0),
sizes_must_be_multiple_of_kSpeed);
ScreenCapturerFake::ScreenCapturerFake()
: size_(SkISize::Make(0, 0)),
bytes_per_row_(0),
box_pos_x_(0),
box_pos_y_(0),
box_speed_x_(kSpeed),
box_speed_y_(kSpeed),
current_buffer_(0) {
ScreenConfigurationChanged();
}
ScreenCapturerFake::~ScreenCapturerFake() {
}
void ScreenCapturerFake::Start(Delegate* delegate) {
delegate_ = delegate;
}
void ScreenCapturerFake::Stop() {
}
void ScreenCapturerFake::InvalidateRegion(const SkRegion& invalid_region) {
helper_.InvalidateRegion(invalid_region);
}
void ScreenCapturerFake::CaptureFrame() {
base::Time capture_start_time = base::Time::Now();
GenerateImage();
helper_.InvalidateScreen(size_);
SkRegion invalid_region;
helper_.SwapInvalidRegion(&invalid_region);
current_buffer_ = (current_buffer_ + 1) % kNumBuffers;
scoped_refptr<ScreenCaptureData> capture_data(new ScreenCaptureData(
buffers_[current_buffer_].get(), bytes_per_row_, size_));
capture_data->mutable_dirty_region() = invalid_region;
helper_.set_size_most_recent(capture_data->size());
capture_data->set_capture_time_ms(
(base::Time::Now() - capture_start_time).InMillisecondsRoundedUp());
delegate_->OnCaptureCompleted(capture_data);
}
void ScreenCapturerFake::GenerateImage() {
memset(buffers_[current_buffer_].get(), 0xff,
size_.width() * size_.height() * ScreenCaptureData::kBytesPerPixel);
uint8* row = buffers_[current_buffer_].get() +
(box_pos_y_ * size_.width() + box_pos_x_) *
ScreenCaptureData::kBytesPerPixel;
box_pos_x_ += box_speed_x_;
if (box_pos_x_ + kBoxWidth >= size_.width() || box_pos_x_ == 0)
box_speed_x_ = -box_speed_x_;
box_pos_y_ += box_speed_y_;
if (box_pos_y_ + kBoxHeight >= size_.height() || box_pos_y_ == 0)
box_speed_y_ = -box_speed_y_;
// Draw rectangle with the following colors in its corners:
// cyan....yellow
// ..............
// blue.......red
for (int y = 0; y < kBoxHeight; ++y) {
for (int x = 0; x < kBoxWidth; ++x) {
int r = x * 255 / kBoxWidth;
int g = y * 255 / kBoxHeight;
int b = 255 - (x * 255 / kBoxWidth);
row[x * ScreenCaptureData::kBytesPerPixel] = r;
row[x * ScreenCaptureData::kBytesPerPixel + 1] = g;
row[x * ScreenCaptureData::kBytesPerPixel + 2] = b;
row[x * ScreenCaptureData::kBytesPerPixel + 3] = 0xff;
}
row += bytes_per_row_;
}
}
void ScreenCapturerFake::ScreenConfigurationChanged() {
size_ = SkISize::Make(kWidth, kHeight);
bytes_per_row_ = size_.width() * ScreenCaptureData::kBytesPerPixel;
// Create memory for the buffers.
int buffer_size = size_.height() * bytes_per_row_;
for (int i = 0; i < kNumBuffers; i++) {
buffers_[i].reset(new uint8[buffer_size]);
}
}
} // namespace media
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