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// Copyright 2011 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <math.h>
#include <stdint.h>
#include <algorithm>
#include "ppapi/cpp/graphics_2d.h"
#include "ppapi/cpp/image_data.h"
#include "ppapi/cpp/instance.h"
#include "ppapi/cpp/module.h"
#include "ppapi/cpp/rect.h"
#include "ppapi/cpp/var.h"
#include "ppapi/utility/completion_callback_factory.h"
#include "ppapi/utility/graphics/paint_manager.h"
static const int kSquareSpacing = 98;
static const int kSquareSize = 5;
static const int kAdvanceXPerFrame = 0;
static const int kAdvanceYPerFrame = -3;
void FillRect(pp::ImageData* image, const pp::Rect& rect, uint32_t color) {
for (int y = std::max(0, rect.y());
y < std::min(image->size().height(), rect.bottom());
y++) {
for (int x = std::max(0, rect.x());
x < std::min(image->size().width(), rect.right());
x++)
*image->GetAddr32(pp::Point(x, y)) = color;
}
}
class MyInstance : public pp::Instance, public pp::PaintManager::Client {
public:
MyInstance(PP_Instance instance)
: pp::Instance(instance),
current_step_(0),
kicked_off_(false) {
factory_.Initialize(this);
paint_manager_.Initialize(this, this, false);
}
virtual void DidChangeView(const pp::Rect& position, const pp::Rect& clip) {
paint_manager_.SetSize(position.size());
}
void OnTimer(int32_t) {
pp::Module::Get()->core()->CallOnMainThread(
16, factory_.NewCallback(&MyInstance::OnTimer), 0);
// The scroll and the invalidate will do the same thing in this example,
// but the invalidate will cause a large repaint, whereas the scroll will
// be faster and cause a smaller repaint.
#if 1
paint_manager_.ScrollRect(pp::Rect(paint_manager_.graphics().size()),
pp::Point(kAdvanceXPerFrame, kAdvanceYPerFrame));
#else
paint_manager_.Invalidate();
#endif
current_step_++;
}
private:
// PaintManager::Client implementation.
virtual bool OnPaint(pp::Graphics2D& graphics,
const std::vector<pp::Rect>& paint_rects,
const pp::Rect& paint_bounds) {
if (!kicked_off_) {
pp::Module::Get()->core()->CallOnMainThread(
16, factory_.NewCallback(&MyInstance::OnTimer), 0);
kicked_off_ = true;
}
// Paint the background.
pp::ImageData updated_image(this, PP_IMAGEDATAFORMAT_BGRA_PREMUL,
paint_bounds.size(), false);
FillRect(&updated_image, pp::Rect(updated_image.size()), 0xFF8888FF);
int x_origin = current_step_ * kAdvanceXPerFrame;
int y_origin = current_step_ * kAdvanceYPerFrame;
int x_offset = x_origin % kSquareSpacing;
int y_offset = y_origin % kSquareSpacing;
for (int ys = 0; ys < graphics.size().height() / kSquareSpacing + 2; ys++) {
for (int xs = 0; xs < graphics.size().width() / kSquareSpacing + 2;
xs++) {
int x = xs * kSquareSpacing + x_offset - paint_bounds.x();
int y = ys * kSquareSpacing + y_offset - paint_bounds.y();
FillRect(&updated_image, pp::Rect(x, y, kSquareSize, kSquareSize),
0xFF000000);
}
}
graphics.PaintImageData(updated_image, paint_bounds.point());
return true;
}
pp::CompletionCallbackFactory<MyInstance> factory_;
pp::PaintManager paint_manager_;
int current_step_;
bool kicked_off_;
};
class MyModule : public pp::Module {
public:
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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