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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 <stdio.h>
#include <stdlib.h>
#include <cassert>
#include "ppapi/c/ppb_gamepad.h"
#include "ppapi/cpp/graphics_2d.h"
#include "ppapi/cpp/image_data.h"
#include "ppapi/cpp/instance.h"
#include "ppapi/cpp/rect.h"
#include "ppapi/cpp/size.h"
#include "ppapi/cpp/var.h"
#include "ppapi/utility/completion_callback_factory.h"
#ifdef WIN32
#undef min
#undef max
// Allow 'this' in initializer list
#pragma warning(disable : 4355)
#endif
class GamepadInstance : public pp::Instance {
public:
explicit GamepadInstance(PP_Instance instance);
virtual ~GamepadInstance();
// Update the graphics context to the new size, and regenerate |pixel_buffer_|
// to fit the new size as well.
virtual void DidChangeView(const pp::View& view);
// Flushes its contents of |pixel_buffer_| to the 2D graphics context.
void Paint();
int width() const {
return pixel_buffer_ ? pixel_buffer_->size().width() : 0;
}
int height() const {
return pixel_buffer_ ? pixel_buffer_->size().height() : 0;
}
// Indicate whether a flush is pending. This can only be called from the
// main thread; it is not thread safe.
bool flush_pending() const { return flush_pending_; }
void set_flush_pending(bool flag) { flush_pending_ = flag; }
private:
// Create and initialize the 2D context used for drawing.
void CreateContext(const pp::Size& size);
// Destroy the 2D drawing context.
void DestroyContext();
// Push the pixels to the browser, then attempt to flush the 2D context. If
// there is a pending flush on the 2D context, then update the pixels only
// and do not flush.
void FlushPixelBuffer();
void FlushCallback(int32_t result);
bool IsContextValid() const { return graphics_2d_context_ != NULL; }
pp::CompletionCallbackFactory<GamepadInstance> callback_factory_;
pp::Graphics2D* graphics_2d_context_;
pp::ImageData* pixel_buffer_;
const PPB_Gamepad* gamepad_;
bool flush_pending_;
};
GamepadInstance::GamepadInstance(PP_Instance instance)
: pp::Instance(instance),
callback_factory_(this),
graphics_2d_context_(NULL),
pixel_buffer_(NULL),
flush_pending_(false) {
pp::Module* module = pp::Module::Get();
assert(module);
gamepad_ = static_cast<const PPB_Gamepad*>(
module->GetBrowserInterface(PPB_GAMEPAD_INTERFACE));
assert(gamepad_);
}
GamepadInstance::~GamepadInstance() {
DestroyContext();
delete pixel_buffer_;
}
void GamepadInstance::DidChangeView(const pp::View& view) {
pp::Rect position = view.GetRect();
if (position.size().width() == width() &&
position.size().height() == height())
return; // Size didn't change, no need to update anything.
// Create a new device context with the new size.
DestroyContext();
CreateContext(position.size());
// Delete the old pixel buffer and create a new one.
delete pixel_buffer_;
pixel_buffer_ = NULL;
if (graphics_2d_context_ != NULL) {
pixel_buffer_ = new pp::ImageData(this,
PP_IMAGEDATAFORMAT_BGRA_PREMUL,
graphics_2d_context_->size(),
false);
}
Paint();
}
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;
}
}
void GamepadInstance::Paint() {
// Clear the background.
FillRect(pixel_buffer_, 0, 0, width(), height(), 0xfff0f0f0);
// Get current gamepad data.
PP_GamepadsSampleData gamepad_data;
gamepad_->Sample(pp_instance(), &gamepad_data);
// Draw the current state for each connected gamepad.
for (size_t p = 0; p < gamepad_data.length; ++p) {
int width2 = width() / gamepad_data.length / 2;
int height2 = height() / 2;
int offset = width2 * 2 * p;
PP_GamepadSampleData& pad = gamepad_data.items[p];
if (!pad.connected)
continue;
// Draw axes.
for (size_t i = 0; i < pad.axes_length; i += 2) {
int x = static_cast<int>(pad.axes[i + 0] * width2 + width2) + offset;
int y = static_cast<int>(pad.axes[i + 1] * height2 + height2);
uint32_t box_bgra = 0x80000000; // Alpha 50%.
FillRect(pixel_buffer_, x - 3, y - 3, 7, 7, box_bgra);
}
// Draw buttons.
for (size_t i = 0; i < pad.buttons_length; ++i) {
float button_val = pad.buttons[i];
uint32_t colour = static_cast<uint32_t>((button_val * 192) + 63) << 24;
int x = i * 8 + 10 + offset;
int y = 10;
FillRect(pixel_buffer_, x - 3, y - 3, 7, 7, colour);
}
}
// Output to the screen.
FlushPixelBuffer();
}
void GamepadInstance::CreateContext(const pp::Size& size) {
if (IsContextValid())
return;
graphics_2d_context_ = new pp::Graphics2D(this, size, false);
if (!BindGraphics(*graphics_2d_context_)) {
printf("Couldn't bind the device context\n");
}
}
void GamepadInstance::DestroyContext() {
if (!IsContextValid())
return;
delete graphics_2d_context_;
graphics_2d_context_ = NULL;
}
void GamepadInstance::FlushPixelBuffer() {
if (!IsContextValid())
return;
// Note that the pixel lock is held while the buffer is copied into the
// device context and then flushed.
graphics_2d_context_->PaintImageData(*pixel_buffer_, pp::Point());
if (flush_pending())
return;
set_flush_pending(true);
graphics_2d_context_->Flush(
callback_factory_.NewCallback(&GamepadInstance::FlushCallback));
}
void GamepadInstance::FlushCallback(int32_t result) {
set_flush_pending(false);
Paint();
}
class GamepadModule : public pp::Module {
public:
GamepadModule() : pp::Module() {}
virtual ~GamepadModule() {}
virtual pp::Instance* CreateInstance(PP_Instance instance) {
return new GamepadInstance(instance);
}
};
namespace pp {
Module* CreateModule() { return new GamepadModule(); }
} // namespace pp
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