src/ppapi/examples/flash_topmost/flash_topmost.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "ppapi/cpp/graphics_2d.h"
   6 #include "ppapi/cpp/image_data.h"
   7 #include "ppapi/cpp/instance.h"
   8 #include "ppapi/cpp/logging.h"
   9 #include "ppapi/cpp/module.h"
  10 #include "ppapi/cpp/private/flash.h"
  11 #include "ppapi/cpp/rect.h"
  12 #include "ppapi/cpp/size.h"
  13 #include "ppapi/utility/completion_callback_factory.h"
  14
  15 const int32_t kTimerInterval = 200;
  16
  17 class MyInstance : public pp::Instance {
  18  public:
  19   explicit MyInstance(PP_Instance instance)
  20       : pp::Instance(instance),
  21         callback_factory_(this),
  22         pending_paint_(false),
  23         waiting_for_flush_completion_(false) {
  24   }
  25   virtual ~MyInstance() {
  26   }
  27
  28   virtual bool Init(uint32_t argc, const char* argn[], const char* argv[]) {
  29     ScheduleNextTimer();
  30     return true;
  31   }
  32
  33   virtual void DidChangeView(const pp::Rect& position, const pp::Rect& clip) {
  34     if (position.size() != size_) {
  35       size_ = position.size();
  36       device_context_ = pp::Graphics2D(this, size_, false);
  37       if (!BindGraphics(device_context_))
  38         return;
  39     }
  40
  41     Paint();
  42   }
  43
  44  private:
  45   void ScheduleNextTimer() {
  46     pp::Module::Get()->core()->CallOnMainThread(
  47         kTimerInterval,
  48         callback_factory_.NewCallback(&MyInstance::OnTimer),
  49         0);
  50   }
  51
  52   void OnTimer(int32_t) {
  53     ScheduleNextTimer();
  54     Paint();
  55   }
  56
  57   void DidFlush(int32_t result) {
  58     waiting_for_flush_completion_ = false;
  59     if (pending_paint_)
  60       Paint();
  61   }
  62
  63   void Paint() {
  64     if (waiting_for_flush_completion_) {
  65       pending_paint_ = true;
  66       return;
  67     }
  68
  69     pending_paint_ = false;
  70
  71     if (size_.IsEmpty())
  72       return;  // Nothing to do.
  73
  74     pp::ImageData image = PaintImage(size_);
  75     if (!image.is_null()) {
  76       device_context_.ReplaceContents(&image);
  77       waiting_for_flush_completion_ = true;
  78       device_context_.Flush(
  79           callback_factory_.NewCallback(&MyInstance::DidFlush));
  80     }
  81   }
  82
  83   pp::ImageData PaintImage(const pp::Size& size) {
  84     pp::ImageData image(this, PP_IMAGEDATAFORMAT_BGRA_PREMUL, size, false);
  85     if (image.is_null())
  86       return image;
  87
  88     pp::Rect rect(size.width() / 8, size.height() / 4,
  89                   3 * size.width() / 4, size.height() / 2);
  90     uint32_t fill_color = pp::flash::Flash::IsRectTopmost(this, rect) ?
  91         0xff00ff00 : 0xffff0000;
  92
  93     for (int y = 0; y < size.height(); y++) {
  94       for (int x = 0; x < size.width(); x++)
  95         *image.GetAddr32(pp::Point(x, y)) = fill_color;
  96     }
  97
  98     for (int x = rect.x(); x < rect.x() + rect.width(); x++) {
  99       *image.GetAddr32(pp::Point(x, rect.y())) = 0xff202020;
 100       *image.GetAddr32(pp::Point(x, rect.y() + rect.height() - 1)) = 0xff202020;
 101     }
 102     for (int y = rect.y(); y < rect.y() + rect.height(); y++) {
 103       *image.GetAddr32(pp::Point(rect.x(), y)) = 0xff202020;
 104       *image.GetAddr32(pp::Point(rect.x() + rect.width() - 1, y)) = 0xff202020;
 105     }
 106
 107     return image;
 108   }
 109
 110   pp::CompletionCallbackFactory<MyInstance> callback_factory_;
 111
 112   // Painting stuff.
 113   pp::Size size_;
 114   pp::Graphics2D device_context_;
 115   bool pending_paint_;
 116   bool waiting_for_flush_completion_;
 117 };
 118
 119 class MyModule : public pp::Module {
 120  public:
 121   virtual pp::Instance* CreateInstance(PP_Instance instance) {
 122     return new MyInstance(instance);
 123   }
 124 };
 125
 126 namespace pp {
 127
 128 // Factory function for your specialization of the Module object.
 129 Module* CreateModule() {
 130   return new MyModule();
 131 }
 132
 133 }  // namespace pp