cc/CCLayerTilingData.cpp

   1 // Copyright 2011 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
   6 #include "config.h"
   7
   8 #if USE(ACCELERATED_COMPOSITING)
   9
  10 #include "CCLayerTilingData.h"
  11
  12 using namespace std;
  13
  14 namespace WebCore {
  15
  16 PassOwnPtr<CCLayerTilingData> CCLayerTilingData::create(const IntSize& tileSize, BorderTexelOption border)
  17 {
  18     return adoptPtr(new CCLayerTilingData(tileSize, border));
  19 }
  20
  21 CCLayerTilingData::CCLayerTilingData(const IntSize& tileSize, BorderTexelOption border)
  22     : m_tilingData(tileSize, IntSize(), border == HasBorderTexels)
  23 {
  24     setTileSize(tileSize);
  25 }
  26
  27 void CCLayerTilingData::setTileSize(const IntSize& size)
  28 {
  29     if (tileSize() == size)
  30         return;
  31
  32     reset();
  33
  34     m_tilingData.setMaxTextureSize(size);
  35 }
  36
  37 const IntSize& CCLayerTilingData::tileSize() const
  38 {
  39     return m_tilingData.maxTextureSize();
  40 }
  41
  42 void CCLayerTilingData::setBorderTexelOption(BorderTexelOption borderTexelOption)
  43 {
  44     bool borderTexels = borderTexelOption == HasBorderTexels;
  45     if (hasBorderTexels() == borderTexels)
  46         return;
  47
  48     reset();
  49     m_tilingData.setHasBorderTexels(borderTexels);
  50 }
  51
  52 const CCLayerTilingData& CCLayerTilingData::operator=(const CCLayerTilingData& tiler)
  53 {
  54     m_tilingData = tiler.m_tilingData;
  55
  56     return *this;
  57 }
  58
  59 void CCLayerTilingData::addTile(PassOwnPtr<Tile> tile, int i, int j)
  60 {
  61     ASSERT(!tileAt(i, j));
  62     tile->moveTo(i, j);
  63     m_tiles.add(make_pair(i, j), tile);
  64 }
  65
  66 PassOwnPtr<CCLayerTilingData::Tile> CCLayerTilingData::takeTile(int i, int j)
  67 {
  68     return m_tiles.take(make_pair(i, j));
  69 }
  70
  71 CCLayerTilingData::Tile* CCLayerTilingData::tileAt(int i, int j) const
  72 {
  73     return m_tiles.get(make_pair(i, j));
  74 }
  75
  76 void CCLayerTilingData::reset()
  77 {
  78     m_tiles.clear();
  79 }
  80
  81 void CCLayerTilingData::contentRectToTileIndices(const IntRect& contentRect, int& left, int& top, int& right, int& bottom) const
  82 {
  83     // An empty rect doesn't result in an empty set of tiles, so don't pass an empty rect.
  84     // FIXME: Possibly we should fill a vector of tiles instead,
  85     //        since the normal use of this function is to enumerate some tiles.
  86     ASSERT(!contentRect.isEmpty());
  87
  88     left = m_tilingData.tileXIndexFromSrcCoord(contentRect.x());
  89     top = m_tilingData.tileYIndexFromSrcCoord(contentRect.y());
  90     right = m_tilingData.tileXIndexFromSrcCoord(contentRect.maxX() - 1);
  91     bottom = m_tilingData.tileYIndexFromSrcCoord(contentRect.maxY() - 1);
  92 }
  93
  94 IntRect CCLayerTilingData::tileRect(const Tile* tile) const
  95 {
  96     IntRect tileRect = m_tilingData.tileBoundsWithBorder(tile->i(), tile->j());
  97     tileRect.setSize(tileSize());
  98     return tileRect;
  99 }
 100
 101 Region CCLayerTilingData::opaqueRegionInContentRect(const IntRect& contentRect) const
 102 {
 103     if (contentRect.isEmpty())
 104         return Region();
 105
 106     Region opaqueRegion;
 107     int left, top, right, bottom;
 108     contentRectToTileIndices(contentRect, left, top, right, bottom);
 109     for (int j = top; j <= bottom; ++j) {
 110         for (int i = left; i <= right; ++i) {
 111             Tile* tile = tileAt(i, j);
 112             if (!tile)
 113                 continue;
 114
 115             IntRect tileOpaqueRect = intersection(contentRect, tile->opaqueRect());
 116             opaqueRegion.unite(tileOpaqueRect);
 117         }
 118     }
 119     return opaqueRegion;
 120 }
 121
 122 void CCLayerTilingData::setBounds(const IntSize& size)
 123 {
 124     m_tilingData.setTotalSize(size);
 125     if (size.isEmpty()) {
 126         m_tiles.clear();
 127         return;
 128     }
 129
 130     // Any tiles completely outside our new bounds are invalid and should be dropped.
 131     int left, top, right, bottom;
 132     contentRectToTileIndices(IntRect(IntPoint(), size), left, top, right, bottom);
 133     Vector<TileMapKey> invalidTileKeys;
 134     for (TileMap::const_iterator it = m_tiles.begin(); it != m_tiles.end(); ++it) {
 135         if (it->first.first > right || it->first.second > bottom)
 136             invalidTileKeys.append(it->first);
 137     }
 138     for (size_t i = 0; i < invalidTileKeys.size(); ++i)
 139         m_tiles.remove(invalidTileKeys[i]);
 140 }
 141
 142 IntSize CCLayerTilingData::bounds() const
 143 {
 144     return m_tilingData.totalSize();
 145 }
 146
 147 } // namespace WebCore
 148
 149 #endif // USE(ACCELERATED_COMPOSITING)