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// Copyright (c) 2015 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 "content/browser/media/capture/cursor_renderer_aura.h"
#include <stdint.h>
#include <algorithm>
#include <cmath>
#include "base/logging.h"
#include "base/time/default_tick_clock.h"
#include "ui/aura/client/screen_position_client.h"
#include "ui/aura/env.h"
#include "ui/aura/window.h"
#include "ui/aura/window_tree_host.h"
#include "ui/base/cursor/cursors_aura.h"
#include "ui/compositor/dip_util.h"
#include "ui/compositor/layer.h"
#include "ui/events/event_utils.h"
#include "ui/wm/public/activation_client.h"
namespace content {
namespace {
inline int clip_byte(int x) {
return std::max(0, std::min(x, 255));
}
inline int alpha_blend(int alpha, int src, int dst) {
return (src * alpha + dst * (255 - alpha)) / 255;
}
} // namespace
// static
scoped_ptr<CursorRenderer> CursorRenderer::Create(gfx::NativeWindow window) {
return scoped_ptr<CursorRenderer>(
new CursorRendererAura(window, kCursorEnabledOnMouseMovement));
}
CursorRendererAura::CursorRendererAura(
aura::Window* window,
CursorDisplaySetting cursor_display_setting)
: window_(window),
cursor_display_setting_(cursor_display_setting),
tick_clock_(&default_tick_clock_),
weak_factory_(this) {
if (window_) {
window_->AddObserver(this);
if (cursor_display_setting == kCursorEnabledOnMouseMovement)
window_->AddPreTargetHandler(this);
}
Clear();
}
CursorRendererAura::~CursorRendererAura() {
if (window_) {
window_->RemoveObserver(this);
if (cursor_display_setting_ == kCursorEnabledOnMouseMovement)
window_->RemovePreTargetHandler(this);
}
}
base::WeakPtr<CursorRenderer> CursorRendererAura::GetWeakPtr() {
return weak_factory_.GetWeakPtr();
}
void CursorRendererAura::Clear() {
last_cursor_ = ui::Cursor();
window_size_when_cursor_last_updated_ = gfx::Size();
scaled_cursor_bitmap_.reset();
last_mouse_position_x_ = 0;
last_mouse_position_y_ = 0;
if (cursor_display_setting_ == kCursorEnabledOnMouseMovement) {
cursor_displayed_ = false;
} else {
cursor_displayed_ = true;
}
}
bool CursorRendererAura::SnapshotCursorState(const gfx::Rect& region_in_frame) {
if (!window_) {
DVLOG(2) << "Skipping update with no window being tracked";
return false;
}
const gfx::Rect window_bounds = window_->GetBoundsInScreen();
gfx::Point cursor_position = aura::Env::GetInstance()->last_mouse_location();
if (!window_bounds.Contains(cursor_position)) {
// Return early if there is no need to draw the cursor.
DVLOG(2) << "Skipping update with cursor outside the window";
Clear();
return false;
}
// If we are sharing the root window, or namely the whole screen, we will
// render the mouse cursor. For ordinary window, we only render the mouse
// cursor when the window is active.
if (!window_->IsRootWindow()) {
aura::client::ActivationClient* activation_client =
aura::client::GetActivationClient(window_->GetRootWindow());
DCHECK(activation_client);
aura::Window* active_window = activation_client->GetActiveWindow();
if (!active_window->Contains(window_)) {
// Return early if the target window is not active.
DVLOG(2) << "Skipping update on an inactive window";
Clear();
return false;
}
}
if (cursor_display_setting_ == kCursorEnabledOnMouseMovement) {
if (cursor_displayed_) {
// Stop displaying cursor if there has been no mouse movement
base::TimeDelta now = tick_clock_->NowTicks() - base::TimeTicks();
if ((now - last_mouse_movement_timestamp_) >
base::TimeDelta::FromSeconds(MAX_IDLE_TIME_SECONDS)) {
cursor_displayed_ = false;
DVLOG(2) << "Turning off cursor display after idle time";
}
}
if (!cursor_displayed_)
return false;
}
gfx::NativeCursor cursor = window_->GetHost()->last_cursor();
gfx::Point cursor_hot_point;
if (last_cursor_ != cursor ||
window_size_when_cursor_last_updated_ != window_bounds.size()) {
SkBitmap cursor_bitmap;
if (ui::GetCursorBitmap(cursor, &cursor_bitmap, &cursor_hot_point)) {
const int scaled_width = cursor_bitmap.width() * region_in_frame.width() /
window_bounds.width();
const int scaled_height = cursor_bitmap.height() *
region_in_frame.height() /
window_bounds.height();
if (scaled_width <= 0 || scaled_height <= 0) {
DVLOG(2) << "scaled_width <= 0";
Clear();
return false;
}
scaled_cursor_bitmap_ = skia::ImageOperations::Resize(
cursor_bitmap, skia::ImageOperations::RESIZE_BEST, scaled_width,
scaled_height);
last_cursor_ = cursor;
window_size_when_cursor_last_updated_ = window_bounds.size();
} else {
// Clear cursor state if ui::GetCursorBitmap failed so that we do not
// render cursor on the captured frame.
Clear();
}
}
cursor_position.Offset(-window_bounds.x() - cursor_hot_point.x(),
-window_bounds.y() - cursor_hot_point.y());
cursor_position_in_frame_ = gfx::Point(
region_in_frame.x() +
cursor_position.x() * region_in_frame.width() / window_bounds.width(),
region_in_frame.y() +
cursor_position.y() * region_in_frame.height() /
window_bounds.height());
return true;
}
// Helper function to composite a cursor bitmap on a YUV420 video frame.
void CursorRendererAura::RenderOnVideoFrame(
const scoped_refptr<media::VideoFrame>& target) const {
if (scaled_cursor_bitmap_.isNull())
return;
DCHECK(target);
gfx::Rect rect = gfx::IntersectRects(
gfx::Rect(scaled_cursor_bitmap_.width(), scaled_cursor_bitmap_.height()) +
gfx::Vector2d(cursor_position_in_frame_.x(),
cursor_position_in_frame_.y()),
target->visible_rect());
scaled_cursor_bitmap_.lockPixels();
for (int y = rect.y(); y < rect.bottom(); ++y) {
int cursor_y = y - cursor_position_in_frame_.y();
uint8_t* yplane = target->data(media::VideoFrame::kYPlane) +
y * target->row_bytes(media::VideoFrame::kYPlane);
uint8_t* uplane = target->data(media::VideoFrame::kUPlane) +
(y / 2) * target->row_bytes(media::VideoFrame::kUPlane);
uint8_t* vplane = target->data(media::VideoFrame::kVPlane) +
(y / 2) * target->row_bytes(media::VideoFrame::kVPlane);
for (int x = rect.x(); x < rect.right(); ++x) {
int cursor_x = x - cursor_position_in_frame_.x();
SkColor color = scaled_cursor_bitmap_.getColor(cursor_x, cursor_y);
int alpha = SkColorGetA(color);
int color_r = SkColorGetR(color);
int color_g = SkColorGetG(color);
int color_b = SkColorGetB(color);
int color_y = clip_byte(
((color_r * 66 + color_g * 129 + color_b * 25 + 128) >> 8) + 16);
yplane[x] = alpha_blend(alpha, color_y, yplane[x]);
// Only sample U and V at even coordinates.
if ((x % 2 == 0) && (y % 2 == 0)) {
int color_u = clip_byte(
((color_r * -38 + color_g * -74 + color_b * 112 + 128) >> 8) + 128);
int color_v = clip_byte(
((color_r * 112 + color_g * -94 + color_b * -18 + 128) >> 8) + 128);
uplane[x / 2] = alpha_blend(alpha, color_u, uplane[x / 2]);
vplane[x / 2] = alpha_blend(alpha, color_v, vplane[x / 2]);
}
}
}
scaled_cursor_bitmap_.unlockPixels();
}
void CursorRendererAura::OnMouseEvent(ui::MouseEvent* event) {
switch (event->type()) {
case ui::ET_MOUSE_MOVED:
if (!cursor_displayed_) {
if (std::abs(event->x() - last_mouse_position_x_) >
MIN_MOVEMENT_PIXELS ||
std::abs(event->y() - last_mouse_position_y_) > MIN_MOVEMENT_PIXELS)
cursor_displayed_ = true;
}
break;
case ui::ET_MOUSE_PRESSED:
case ui::ET_MOUSE_RELEASED:
case ui::ET_MOUSEWHEEL:
cursor_displayed_ = true;
break;
default:
return;
}
if (cursor_displayed_) {
last_mouse_movement_timestamp_ = event->time_stamp();
last_mouse_position_x_ = event->x();
last_mouse_position_y_ = event->y();
}
}
void CursorRendererAura::OnWindowDestroying(aura::Window* window) {
DCHECK_EQ(window_, window);
if (cursor_display_setting_ == kCursorEnabledOnMouseMovement)
window_->RemovePreTargetHandler(this);
window_->RemoveObserver(this);
window_ = nullptr;
}
} // namespace content
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