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// 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.
#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/351564777): Remove this and convert code to safer constructs.
#pragma allow_unsafe_buffers
#endif
#include <stdarg.h>
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include <algorithm>
#include <cmath>
#include "ppapi/c/ppb_gamepad.h"
#include "ppapi/c/ppb_input_event.h"
#include "ppapi/cpp/completion_callback.h"
#include "ppapi/cpp/graphics_2d.h"
#include "ppapi/cpp/image_data.h"
#include "ppapi/cpp/input_event.h"
#include "ppapi/cpp/instance.h"
#include "ppapi/cpp/logging.h"
#include "ppapi/cpp/module.h"
#include "ppapi/cpp/rect.h"
#include "ppapi/cpp/var.h"
#include "ppapi/cpp/view.h"
#include "ppapi/utility/completion_callback_factory.h"
void FillRect(pp::ImageData* image, int left, int top, int width, int height,
uint32_t color) {
for (int y = std::max(0, top);
y < std::min(image->size().height() - 1, top + height);
y++) {
for (int x = std::max(0, left);
x < std::min(image->size().width() - 1, left + width);
x++)
*image->GetAddr32(pp::Point(x, y)) = color;
}
}
class MyInstance : public pp::Instance {
public:
explicit MyInstance(PP_Instance instance)
: pp::Instance(instance),
width_(0),
height_(0),
callback_factory_(this),
gamepad_(NULL) {
}
virtual ~MyInstance() {}
virtual bool Init(uint32_t argc, const char* argn[], const char* argv[]) {
gamepad_ = reinterpret_cast<const PPB_Gamepad*>(
pp::Module::Get()->GetBrowserInterface(PPB_GAMEPAD_INTERFACE));
if (!gamepad_)
return false;
return true;
}
virtual void DidChangeView(const pp::View& view) {
pp::Rect rect = view.GetRect();
if (rect.size().width() == width_ &&
rect.size().height() == height_)
return; // We don't care about the position, only the size.
width_ = rect.size().width();
height_ = rect.size().height();
device_context_ = pp::Graphics2D(this, pp::Size(width_, height_), false);
if (!BindGraphics(device_context_))
return;
Paint();
}
void OnFlush(int32_t) {
// This plugin continuously paints because it continously samples the
// gamepad and paints its updated state.
Paint();
}
private:
void Paint() {
pp::ImageData image = PaintImage(device_context_.size());
if (!image.is_null()) {
device_context_.ReplaceContents(&image);
device_context_.Flush(
callback_factory_.NewCallback(&MyInstance::OnFlush));
}
}
pp::ImageData PaintImage(const pp::Size& size) {
pp::ImageData image(this, PP_IMAGEDATAFORMAT_BGRA_PREMUL, size, true);
if (image.is_null())
return image;
PP_GamepadsSampleData gamepad_data;
gamepad_->Sample(pp_instance(), &gamepad_data);
if (gamepad_data.length > 0 && gamepad_data.items[0].connected) {
int width2 = size.width() / 2;
int height2 = size.height() / 2;
// Draw 2 axes
for (size_t i = 0; i < gamepad_data.items[0].axes_length; i += 2) {
int x = static_cast<int>(
gamepad_data.items[0].axes[i + 0] * width2 + width2);
int y = static_cast<int>(
gamepad_data.items[0].axes[i + 1] * height2 + height2);
uint32_t box_bgra = 0x80000000; // Alpha 50%.
FillRect(&image, x - 3, y - 3, 7, 7, box_bgra);
}
for (size_t i = 0; i < gamepad_data.items[0].buttons_length; ++i) {
float button_val = gamepad_data.items[0].buttons[i];
uint32_t colour = static_cast<uint32_t>((button_val * 192) + 63) << 24;
int x = static_cast<int>(i) * 8 + 10;
int y = 10;
FillRect(&image, x - 3, y - 3, 7, 7, colour);
}
}
return image;
}
int width_;
int height_;
pp::CompletionCallbackFactory<MyInstance> callback_factory_;
const PPB_Gamepad* gamepad_;
pp::Graphics2D device_context_;
};
// This object is the global object representing this plugin library as long
// as it is loaded.
class MyModule : public pp::Module {
public:
MyModule() : pp::Module() {}
virtual ~MyModule() {}
// Override CreateInstance to create your customized Instance object.
virtual pp::Instance* CreateInstance(PP_Instance instance) {
return new MyInstance(instance);
}
};
namespace pp {
// Factory function for your specialization of the Module object.
Module* CreateModule() {
return new MyModule();
}
} // namespace pp
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