// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <stdarg.h>
#include <stdio.h>
#include <string.h>
#include <cmath>
#include <cstdlib>
#include <algorithm>
#include "mouse_lock.h"
#ifdef WIN32
#undef min
#undef max
#undef PostMessage
#endif
// Indicate the direction of the mouse location relative to the center of the
// view. These values are used to determine which 2D quadrant the needle lies
// in.
typedef enum {
kLeft = 0,
kRight = 1,
kUp = 2,
kDown = 3
} MouseDirection;
namespace {
const int kCentralSpotRadius = 5;
const uint32_t kReturnKeyCode = 13;
const uint32_t kBackgroundColor = 0xff606060;
const uint32_t kForegroundColor = 0xfff08080;
} // namespace
MouseLockInstance::~MouseLockInstance() {
free(background_scanline_);
background_scanline_ = NULL;
}
bool MouseLockInstance::Init(uint32_t argc,
const char* argn[],
const char* argv[]) {
RequestInputEvents(PP_INPUTEVENT_CLASS_MOUSE | PP_INPUTEVENT_CLASS_KEYBOARD);
return true;
}
bool MouseLockInstance::HandleInputEvent(const pp::InputEvent& event) {
switch (event.GetType()) {
case PP_INPUTEVENT_TYPE_MOUSEDOWN: {
if (mouse_locked_) {
UnlockMouse();
} else {
LockMouse(
callback_factory_.NewCallback(&MouseLockInstance::DidLockMouse));
}
return true;
}
case PP_INPUTEVENT_TYPE_MOUSEMOVE: {
pp::MouseInputEvent mouse_event(event);
mouse_movement_ = mouse_event.GetMovement();
Paint();
return true;
}
case PP_INPUTEVENT_TYPE_KEYDOWN: {
pp::KeyboardInputEvent key_event(event);
// Switch in and out of fullscreen when 'Enter' is hit
if (key_event.GetKeyCode() == kReturnKeyCode) {
// Ignore switch if in transition
if (!is_context_bound_)
return true;
if (fullscreen_.IsFullscreen()) {
if (!fullscreen_.SetFullscreen(false)) {
Log("Could not leave fullscreen mode\n");
} else {
is_context_bound_ = false;
}
} else {
if (!fullscreen_.SetFullscreen(true)) {
Log("Could not enter fullscreen mode\n");
} else {
is_context_bound_ = false;
}
}
}
return true;
}
case PP_INPUTEVENT_TYPE_MOUSEUP:
case PP_INPUTEVENT_TYPE_MOUSEENTER:
case PP_INPUTEVENT_TYPE_MOUSELEAVE:
case PP_INPUTEVENT_TYPE_WHEEL:
case PP_INPUTEVENT_TYPE_RAWKEYDOWN:
case PP_INPUTEVENT_TYPE_KEYUP:
case PP_INPUTEVENT_TYPE_CHAR:
case PP_INPUTEVENT_TYPE_CONTEXTMENU:
case PP_INPUTEVENT_TYPE_IME_COMPOSITION_START:
case PP_INPUTEVENT_TYPE_IME_COMPOSITION_UPDATE:
case PP_INPUTEVENT_TYPE_IME_COMPOSITION_END:
case PP_INPUTEVENT_TYPE_IME_TEXT:
case PP_INPUTEVENT_TYPE_UNDEFINED:
case PP_INPUTEVENT_TYPE_TOUCHSTART:
case PP_INPUTEVENT_TYPE_TOUCHMOVE:
case PP_INPUTEVENT_TYPE_TOUCHEND:
case PP_INPUTEVENT_TYPE_TOUCHCANCEL:
default:
return false;
}
}
void MouseLockInstance::DidChangeView(const pp::View& view) {
// DidChangeView can get called for many reasons, so we only want to
// rebuild the device context if we really need to.
if ((size_ == view.GetRect().size()) &&
(was_fullscreen_ == view.IsFullscreen()) && is_context_bound_) {
Log("DidChangeView SKIP %d,%d FULL=%s CTX Bound=%s",
view.GetRect().width(),
view.GetRect().height(),
view.IsFullscreen() ? "true" : "false",
is_context_bound_ ? "true" : "false");
return;
}
Log("DidChangeView DO %d,%d FULL=%s CTX Bound=%s",
view.GetRect().width(),
view.GetRect().height(),
view.IsFullscreen() ? "true" : "false",
is_context_bound_ ? "true" : "false");
size_ = view.GetRect().size();
device_context_ = pp::Graphics2D(this, size_, false);
waiting_for_flush_completion_ = false;
is_context_bound_ = BindGraphics(device_context_);
if (!is_context_bound_) {
Log("Could not bind to 2D context\n.");
return;
} else {
Log("Bound to 2D context size %d,%d.\n", size_.width(), size_.height());
}
// Create a scanline for fill.
delete[] background_scanline_;
background_scanline_ = new uint32_t[size_.width()];
uint32_t* bg_pixel = background_scanline_;
for (int x = 0; x < size_.width(); ++x) {
*bg_pixel++ = kBackgroundColor;
}
// Remember if we are fullscreen or not
was_fullscreen_ = view.IsFullscreen();
// Paint this context
Paint();
}
void MouseLockInstance::MouseLockLost() {
if (mouse_locked_) {
Log("Mouselock unlocked.\n");
mouse_locked_ = false;
Paint();
}
}
void MouseLockInstance::DidLockMouse(int32_t result) {
mouse_locked_ = result == PP_OK;
if (result != PP_OK) {
Log("Mouselock failed with failed with error number %d.\n", result);
}
mouse_movement_.set_x(0);
mouse_movement_.set_y(0);
Paint();
}
void MouseLockInstance::DidFlush(int32_t result) {
if (result != 0)
Log("Flushed failed with error number %d.\n", result);
waiting_for_flush_completion_ = false;
}
void MouseLockInstance::Paint() {
// If we are already waiting to paint...
if (waiting_for_flush_completion_) {
return;
}
pp::ImageData image = PaintImage(size_);
if (image.is_null()) {
Log("Could not create image data\n");
return;
}
device_context_.ReplaceContents(&image);
waiting_for_flush_completion_ = true;
device_context_.Flush(
callback_factory_.NewCallback(&MouseLockInstance::DidFlush));
}
pp::ImageData MouseLockInstance::PaintImage(const pp::Size& size) {
pp::ImageData image(this, PP_IMAGEDATAFORMAT_BGRA_PREMUL, size, false);
if (image.is_null() || image.data() == NULL) {
Log("Skipping image.\n");
return image;
}
ClearToBackground(&image);
DrawCenterSpot(&image, kForegroundColor);
DrawNeedle(&image, kForegroundColor);
return image;
}
void MouseLockInstance::ClearToBackground(pp::ImageData* image) {
if (image == NULL) {
Log("ClearToBackground with NULL image.");
return;
}
if (background_scanline_ == NULL) {
Log("ClearToBackground with no scanline.");
return;
}
int image_height = image->size().height();
int image_width = image->size().width();
for (int y = 0; y < image_height; ++y) {
uint32_t* scanline = image->GetAddr32(pp::Point(0, y));
memcpy(scanline,
background_scanline_,
image_width * sizeof(*background_scanline_));
}
}
void MouseLockInstance::DrawCenterSpot(pp::ImageData* image,
uint32_t spot_color) {
if (image == NULL) {
Log("DrawCenterSpot with NULL image");
return;
}
// Draw the center spot. The ROI is bounded by the size of the spot, plus
// one pixel.
int center_x = image->size().width() / 2;
int center_y = image->size().height() / 2;
int region_of_interest_radius = kCentralSpotRadius + 1;
pp::Point left_top(std::max(0, center_x - region_of_interest_radius),
std::max(0, center_y - region_of_interest_radius));
pp::Point right_bottom(
std::min(image->size().width(), center_x + region_of_interest_radius),
std::min(image->size().height(), center_y + region_of_interest_radius));
for (int y = left_top.y(); y < right_bottom.y(); ++y) {
for (int x = left_top.x(); x < right_bottom.x(); ++x) {
if (GetDistance(x, y, center_x, center_y) < kCentralSpotRadius) {
*image->GetAddr32(pp::Point(x, y)) = spot_color;
}
}
}
}
void MouseLockInstance::DrawNeedle(pp::ImageData* image,
uint32_t needle_color) {
if (image == NULL) {
Log("DrawNeedle with NULL image");
return;
}
if (GetDistance(mouse_movement_.x(), mouse_movement_.y(), 0, 0) <=
kCentralSpotRadius) {
return;
}
int abs_mouse_x = std::abs(mouse_movement_.x());
int abs_mouse_y = std::abs(mouse_movement_.y());
int center_x = image->size().width() / 2;
int center_y = image->size().height() / 2;
pp::Point vertex(mouse_movement_.x() + center_x,
mouse_movement_.y() + center_y);
pp::Point anchor_1;
pp::Point anchor_2;
MouseDirection direction = kLeft;
if (abs_mouse_x >= abs_mouse_y) {
anchor_1.set_x(center_x);
anchor_1.set_y(center_y - kCentralSpotRadius);
anchor_2.set_x(center_x);
anchor_2.set_y(center_y + kCentralSpotRadius);
direction = (mouse_movement_.x() < 0) ? kLeft : kRight;
if (direction == kLeft)
anchor_1.swap(anchor_2);
} else {
anchor_1.set_x(center_x + kCentralSpotRadius);
anchor_1.set_y(center_y);
anchor_2.set_x(center_x - kCentralSpotRadius);
anchor_2.set_y(center_y);
direction = (mouse_movement_.y() < 0) ? kUp : kDown;
if (direction == kUp)
anchor_1.swap(anchor_2);
}
pp::Point left_top(std::max(0, center_x - abs_mouse_x),
std::max(0, center_y - abs_mouse_y));
pp::Point right_bottom(
std::min(image->size().width(), center_x + abs_mouse_x),
std::min(image->size().height(), center_y + abs_mouse_y));
for (int y = left_top.y(); y < right_bottom.y(); ++y) {
for (int x = left_top.x(); x < right_bottom.x(); ++x) {
bool within_bound_1 = ((y - anchor_1.y()) * (vertex.x() - anchor_1.x())) >
((vertex.y() - anchor_1.y()) * (x - anchor_1.x()));
bool within_bound_2 = ((y - anchor_2.y()) * (vertex.x() - anchor_2.x())) <
((vertex.y() - anchor_2.y()) * (x - anchor_2.x()));
bool within_bound_3 = (direction == kUp && y < center_y) ||
(direction == kDown && y > center_y) ||
(direction == kLeft && x < center_x) ||
(direction == kRight && x > center_x);
if (within_bound_1 && within_bound_2 && within_bound_3) {
*image->GetAddr32(pp::Point(x, y)) = needle_color;
}
}
}
}
void MouseLockInstance::Log(const char* format, ...) {
static PPB_Console* console =
(PPB_Console*)pp::Module::Get()->GetBrowserInterface(
PPB_CONSOLE_INTERFACE);
if (NULL == console)
return;
va_list args;
va_start(args, format);
char buf[512];
vsnprintf(buf, sizeof(buf) - 1, format, args);
buf[sizeof(buf) - 1] = '\0';
va_end(args);
pp::Var value(buf);
console->Log(pp_instance(), PP_LOGLEVEL_ERROR, value.pp_var());
}
// This object is the global object representing this plugin library as long
// as it is loaded.
class MouseLockModule : public pp::Module {
public:
MouseLockModule() : pp::Module() {}
virtual ~MouseLockModule() {}
// Override CreateInstance to create your customized Instance object.
virtual pp::Instance* CreateInstance(PP_Instance instance) {
return new MouseLockInstance(instance);
}
};
namespace pp {
// Factory function for your specialization of the Module object.
Module* CreateModule() { return new MouseLockModule(); }
} // namespace pp
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