15821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Copyright (c) 2011 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)#ifndef UI_GFX_CANVAS_PAINT_WIN_H_ 65821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define UI_GFX_CANVAS_PAINT_WIN_H_ 75821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 85821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "skia/ext/platform_canvas.h" 97d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles)#include "ui/base/win/dpi.h" 105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "ui/gfx/canvas.h" 112a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)#include "ui/gfx/size.h" 125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)namespace gfx { 145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 15a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles)// A class designed to help with WM_PAINT operations on Windows. It will create 16a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles)// the bitmap and canvas with the correct size and transform for the dirty rect. 17a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles)// The bitmap will be automatically painted to the screen on destruction. 185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// 195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// You MUST call isEmpty before painting to determine if anything needs 205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// painting. Sometimes the dirty rect can actually be empty, and this makes 215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// the bitmap functions we call unhappy. The caller should not paint in this 225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// case. 235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// 245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Therefore, all you need to do is: 255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// case WM_PAINT: { 26a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles)// PAINTSTRUCT ps; 27a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles)// HDC hdc = BeginPaint(hwnd, &ps); 28a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles)// gfx::CanvasSkiaPaint canvas(hwnd, hdc, ps); 295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// if (!canvas.isEmpty()) { 305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// ... paint to the canvas ... 315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// } 32a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles)// EndPaint(hwnd, &ps); 335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// return 0; 345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// } 355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Note: The created context is always inialized to (0, 0, 0, 0). 365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)class UI_EXPORT CanvasSkiaPaint : public Canvas { 375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) public: 385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // This constructor assumes the canvas is opaque. 39a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) CanvasSkiaPaint(HWND hwnd, HDC dc, const PAINTSTRUCT& ps); 40a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) virtual ~CanvasSkiaPaint(); 415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Creates a CanvasSkiaPaint for the specified region that paints to the 43a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) // specified dc. 44a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) CanvasSkiaPaint(HDC dc, bool opaque, int x, int y, int w, int h); 455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 46a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) // Returns the rectangle that is invalid. 47a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) virtual gfx::Rect GetInvalidRect() const; 485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Returns true if the invalid region is empty. The caller should call this 505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // function to determine if anything needs painting. 51a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) bool is_empty() const { 525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return ps_.rcPaint.right - ps_.rcPaint.left == 0 || 535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ps_.rcPaint.bottom - ps_.rcPaint.top == 0; 54a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) }; 555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Use to access the Windows painting parameters, especially useful for 575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // getting the bounding rect for painting: paintstruct().rcPaint 58a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) const PAINTSTRUCT& paint_struct() const { return ps_; } 595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Returns the DC that will be painted to 61a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) HDC paint_dc() const { return paint_dc_; } 62a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) 63a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) private: 64a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) void Init(bool opaque); 655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) HWND hwnd_; 675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) HDC paint_dc_; 685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) PAINTSTRUCT ps_; 695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Disallow copy and assign. 71a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) DISALLOW_COPY_AND_ASSIGN(CanvasSkiaPaint); 725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)}; 735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} // namespace gfx 755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif // UI_GFX_CANVAS_PAINT_WIN_H_ 77