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annotate OrthancStone/Sources/Viewport/IViewport.h @ 1576:92fca2b3ba3d

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sanitizing the handling of canvas size
author Sebastien Jodogne <s.jodogne@gmail.com>
date Thu, 24 Sep 2020 16:40:30 +0200
parents 314b6dc507d9
children e8a120dd05bd
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1 /**
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2 * Stone of Orthanc
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3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
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4 * Department, University Hospital of Liege, Belgium
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5 * Copyright (C) 2017-2020 Osimis S.A., Belgium
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6 *
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7 * This program is free software: you can redistribute it and/or
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8 * modify it under the terms of the GNU Affero General Public License
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9 * as published by the Free Software Foundation, either version 3 of
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10 * the License, or (at your option) any later version.
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11 *
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12 * This program is distributed in the hope that it will be useful, but
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13 * WITHOUT ANY WARRANTY; without even the implied warranty of
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14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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15 * Affero General Public License for more details.
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16 *
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17 * You should have received a copy of the GNU Affero General Public License
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18 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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19 **/
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20
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21 #pragma once
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22
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23 #include "../Scene2D/ICompositor.h"
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24
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25 namespace OrthancStone
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26 {
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27 class ViewportController;
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28
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29 /**
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30 * Class that combines a Scene2D with a canvas where to draw the
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31 * scene. A call to "Refresh()" will update the content of the
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32 * canvas. A "IViewport" can possibly be accessed from several
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33 * threads depending on the rendering back-end (e.g. in SDL or Qt):
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34 * The "ILock" subclass implements the locking mechanism to modify
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35 * the content of the scene.
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36 *
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37 * NB: The lock must be a "recursive_mutex", as the viewport
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38 * controller can lock it a second time (TODO - Why so?).
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39 **/
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40 class IViewport : public boost::noncopyable
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41 {
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42 public:
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43 class ILock : public boost::noncopyable
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44 {
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45 public:
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46 virtual ~ILock()
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47 {
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48 }
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49
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50 virtual bool HasCompositor() const = 0;
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51
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52 /**
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53 Do not store the result! Only access the compositor interface through
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54 the lock.
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55 */
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56 virtual ICompositor& GetCompositor() = 0;
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57
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58 /**
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59 Do not store the result! Only access the compositor interface through
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60 the lock.
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61 */
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62 virtual ViewportController& GetController() = 0;
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63
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64 virtual void Invalidate() = 0;
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65
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66
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67 /**
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68 * This function must be called when the layout has changed, and
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69 * thus the size of the canvas must be re-computed. Avoid
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70 * calling this method too often for performance.
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71 **/
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72 virtual void RefreshCanvasSize() = 0;
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73 };
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74
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75 virtual ~IViewport()
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76 {
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77 }
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78
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79 virtual ILock* Lock() = 0;
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80 };
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81 }