pointer_event_input.cc revision 5821806d5e7f356e8fa4b058a389a808ea183019
15821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Copyright (c) 2012 The Chromium Authors. All rights reserved. 25821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Use of this source code is governed by a BSD-style license that can be 35821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// found in the LICENSE file. 45821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 55821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "ppapi/c/pp_input_event.h" 65821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "ppapi/cpp/graphics_2d.h" 75821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "ppapi/cpp/image_data.h" 85821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "ppapi/cpp/input_event.h" 95821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "ppapi/cpp/instance.h" 105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "ppapi/cpp/module.h" 115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "ppapi/cpp/size.h" 125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "ppapi/cpp/view.h" 135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "ppapi/utility/graphics/paint_manager.h" 145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Number of pixels to each side of the center of the square that we draw. 165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static const int kSquareRadius = 2; 175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// We identify our square by the center point. This computes the rect for the 195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// square given that point. 205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)pp::Rect SquareForPoint(int x, int y) { 215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return PP_MakeRectFromXYWH(x - kSquareRadius, y - kSquareRadius, 225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) kSquareRadius * 2 + 1, kSquareRadius * 2 + 1); 235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static void FillRect(pp::ImageData* image, 265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int left, int top, int width, int height, 275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) uint32_t color) { 285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (int y = std::max(0, top); 295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) y < std::min(image->size().height() - 1, top + height); 305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) y++) { 315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (int x = std::max(0, left); 325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) x < std::min(image->size().width() - 1, left + width); 335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) x++) 345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) *image->GetAddr32(pp::Point(x, y)) = color; 355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)class MyInstance : public pp::Instance, public pp::PaintManager::Client { 395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) public: 405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) MyInstance(PP_Instance instance) 415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) : pp::Instance(instance), 425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) paint_manager_(), 435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) last_x_(0), 445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) last_y_(0) { 455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) paint_manager_.Initialize(this, this, false); 465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) RequestInputEvents(PP_INPUTEVENT_CLASS_MOUSE | PP_INPUTEVENT_CLASS_TOUCH); 475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) virtual bool HandleInputEvent(const pp::InputEvent& event) { 505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) switch (event.GetType()) { 515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) case PP_INPUTEVENT_TYPE_MOUSEDOWN: { 525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) pp::MouseInputEvent mouse_event(event); 535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Update the square on a mouse down. 545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (mouse_event.GetButton() == PP_INPUTEVENT_MOUSEBUTTON_LEFT) { 555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) UpdateSquare(static_cast<int>(mouse_event.GetPosition().x()), 565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) static_cast<int>(mouse_event.GetPosition().y())); 575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return true; 595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) case PP_INPUTEVENT_TYPE_MOUSEMOVE: { 615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) pp::MouseInputEvent mouse_event(event); 625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Update the square on a drag. 635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (mouse_event.GetButton() == PP_INPUTEVENT_MOUSEBUTTON_LEFT) { 645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) UpdateSquare(static_cast<int>(mouse_event.GetPosition().x()), 655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) static_cast<int>(mouse_event.GetPosition().y())); 665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return true; 685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) case PP_INPUTEVENT_TYPE_TOUCHSTART: { 715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) pp::TouchInputEvent touch(event); 725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Update the square on a touch down. 735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) uint32_t count = touch.GetTouchCount(PP_TOUCHLIST_TYPE_CHANGEDTOUCHES); 745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (uint32_t i = 0; i < count; ++i) { 755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) pp::TouchPoint point = touch.GetTouchByIndex( 765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) PP_TOUCHLIST_TYPE_CHANGEDTOUCHES, i); 775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) UpdateSquare(static_cast<int>(point.position().x()), 785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) static_cast<int>(point.position().y())); 795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return true; 815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) case PP_INPUTEVENT_TYPE_TOUCHMOVE: 835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) case PP_INPUTEVENT_TYPE_TOUCHEND: 845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) case PP_INPUTEVENT_TYPE_TOUCHCANCEL: 855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return true; 865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) default: 885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return false; 895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) virtual void DidChangeView(const pp::View& view) { 935821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) paint_manager_.SetSize(view.GetRect().size()); 945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 955821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 965821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // PaintManager::Client implementation. 975821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) virtual bool OnPaint(pp::Graphics2D& graphics_2d, 985821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const std::vector<pp::Rect>& paint_rects, 995821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const pp::Rect& paint_bounds) { 1005821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Make an image just large enough to hold all dirty rects. We won't 1015821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // actually paint all of these pixels below, but rather just the dirty 1025821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // ones. Since image allocation can be somewhat heavyweight, we wouldn't 1035821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // want to allocate separate images in the case of multiple dirty rects. 1045821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) pp::ImageData updated_image(this, PP_IMAGEDATAFORMAT_BGRA_PREMUL, 1055821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) paint_bounds.size(), false); 1065821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1075821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // We could repaint everything inside the image we made above. For this 1085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // example, that would probably be the easiest thing since updates are 1095821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // small and typically close to each other. However, for the purposes of 1105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // demonstration, here we only actually paint the pixels that changed, 1115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // which may be the entire update region, or could be multiple discontigous 1125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // regions inside the update region. 1135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // 1145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Note that the aggregator used by the paint manager won't give us 1155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // multiple regions that overlap, so we don't have to worry about double 1165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // painting in this code. 1175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (size_t i = 0; i < paint_rects.size(); i++) { 1185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Since our image is just the invalid region, we need to offset the 1195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // areas we paint by that much. This is just a light blue background. 1205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) FillRect(&updated_image, 1215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) paint_rects[i].x() - paint_bounds.x(), 1225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) paint_rects[i].y() - paint_bounds.y(), 1235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) paint_rects[i].width(), 1245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) paint_rects[i].height(), 1255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 0xFFAAAAFF); 1265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 1275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Paint the square black. Because we're lazy, we do this outside of the 1295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // loop above. 1305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) pp::Rect square = SquareForPoint(last_x_, last_y_); 1315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) FillRect(&updated_image, 1325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) square.x() - paint_bounds.x(), 1335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) square.y() - paint_bounds.y(), 1345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) square.width(), 1355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) square.height(), 1365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 0xFF000000); 1375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) graphics_2d.PaintImageData(updated_image, paint_bounds.point()); 1395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return true; 1405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 1415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) private: 1435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) void UpdateSquare(int x, int y) { 1445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (x == last_x_ && y == last_y_) 1455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return; // Nothing changed. 1465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Invalidate the region around the old square which needs to be repainted 1485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // because it's no longer there. 1495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) paint_manager_.InvalidateRect(SquareForPoint(last_x_, last_y_)); 1505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Update the current position. 1525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) last_x_ = x; 1535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) last_y_ = y; 1545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Also invalidate the region around the new square. 1565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) paint_manager_.InvalidateRect(SquareForPoint(last_x_, last_y_)); 1575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 1585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) pp::PaintManager paint_manager_; 1605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int last_x_; 1625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int last_y_; 1635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)}; 1645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)class MyModule : public pp::Module { 1665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) public: 1675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) virtual pp::Instance* CreateInstance(PP_Instance instance) { 1685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return new MyInstance(instance); 1695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 1705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)}; 1715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)namespace pp { 1735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Factory function for your specialization of the Module object. 1755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)Module* CreateModule() { 1765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return new MyModule(); 1775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 1785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} // namespace pp 180