1 /* 2 * Copyright 2011, The Android Open Source Project 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * * Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * * Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY 14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR 17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26 #ifndef UpdateManager_h 27 #define UpdateManager_h 28 29 class SkCanvas; 30 class SkRegion; 31 32 namespace WebCore { 33 34 class BaseTile; 35 36 // UpdateManager Architecture 37 38 // The UpdateManager is used to defer updates and invalidations to a layer, 39 // so that the layer can finish painting one version completely without being 40 // interrupted by new invals/content 41 42 class UpdateManager { 43 public: 44 UpdateManager(); 45 46 ~UpdateManager(); 47 48 // swap deferred members in place of painting members 49 void swap(); 50 51 void updateInval(const SkRegion& invalRegion); 52 53 void updatePicture(SkPicture* picture); 54 55 bool paint(BaseTile* tile, SkCanvas* canvas, unsigned int* pictureUsed); 56 57 void clearPaintingInval(); 58 getPaintingInval()59 const SkRegion& getPaintingInval() { 60 return m_paintingInval; 61 } 62 getPaintingPicture()63 SkPicture* getPaintingPicture() { 64 // NOTE: only modified on UI thread, so UI thread access doesn't need mutex 65 return m_paintingPicture; 66 } 67 68 private: 69 // protect m_paintingPicture 70 // swap() on UI thread modifies 71 // paint() on texture gen thread reads 72 android::Mutex m_paintingPictureSync; 73 SkPicture* m_paintingPicture; 74 75 // inval region to be redrawn with the current paintingPicture 76 SkRegion m_paintingInval; 77 78 // most recently received picture, moved into painting on swap() 79 SkPicture* m_deferredPicture; 80 81 // all invals since last swap(), merged with painting inval on swap() 82 SkRegion m_deferredInval; 83 }; 84 85 } // namespace WebCore 86 87 #endif //#define UpdateManager_h 88