Home | History | Annotate | Download | only in resources 
      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 #include "cc/resources/layer_tiling_data.h"
      6 
      7 #include <vector>
      8 
      9 #include "base/logging.h"
     10 
     11 namespace cc {
     12 
     13 scoped_ptr<LayerTilingData> LayerTilingData::Create(gfx::Size tile_size,
     14                                                     BorderTexelOption border) {
     15   return make_scoped_ptr(new LayerTilingData(tile_size, border));
     16 }
     17 
     18 LayerTilingData::LayerTilingData(gfx::Size tile_size, BorderTexelOption border)
     19     : tiling_data_(tile_size, gfx::Size(), border == HAS_BORDER_TEXELS) {
     20   SetTileSize(tile_size);
     21 }
     22 
     23 LayerTilingData::~LayerTilingData() {}
     24 
     25 void LayerTilingData::SetTileSize(gfx::Size size) {
     26   if (tile_size() == size)
     27     return;
     28 
     29   reset();
     30 
     31   tiling_data_.SetMaxTextureSize(size);
     32 }
     33 
     34 gfx::Size LayerTilingData::tile_size() const {
     35   return tiling_data_.max_texture_size();
     36 }
     37 
     38 void LayerTilingData::SetBorderTexelOption(
     39     BorderTexelOption border_texel_option) {
     40   bool border_texels = border_texel_option == HAS_BORDER_TEXELS;
     41   if (has_border_texels() == border_texels)
     42     return;
     43 
     44   reset();
     45   tiling_data_.SetHasBorderTexels(border_texels);
     46 }
     47 
     48 const LayerTilingData& LayerTilingData::operator=
     49     (const LayerTilingData & tiler) {
     50   tiling_data_ = tiler.tiling_data_;
     51 
     52   return *this;
     53 }
     54 
     55 void LayerTilingData::AddTile(scoped_ptr<Tile> tile, int i, int j) {
     56   DCHECK(!TileAt(i, j));
     57   tile->move_to(i, j);
     58   tiles_.add(std::make_pair(i, j), tile.Pass());
     59 }
     60 
     61 scoped_ptr<LayerTilingData::Tile> LayerTilingData::TakeTile(int i, int j) {
     62   return tiles_.take_and_erase(std::make_pair(i, j));
     63 }
     64 
     65 LayerTilingData::Tile* LayerTilingData::TileAt(int i, int j) const {
     66   return tiles_.get(std::make_pair(i, j));
     67 }
     68 
     69 void LayerTilingData::ContentRectToTileIndices(gfx::Rect content_rect,
     70                                                int* left,
     71                                                int* top,
     72                                                int* right,
     73                                                int* bottom) const {
     74   // An empty rect doesn't result in an empty set of tiles, so don't pass an
     75   // empty rect.
     76   // TODO(enne): Possibly we should fill a vector of tiles instead, since the
     77   // normal use of this function is to enumerate some tiles.
     78   DCHECK(!content_rect.IsEmpty());
     79 
     80   *left = tiling_data_.TileXIndexFromSrcCoord(content_rect.x());
     81   *top = tiling_data_.TileYIndexFromSrcCoord(content_rect.y());
     82   *right = tiling_data_.TileXIndexFromSrcCoord(content_rect.right() - 1);
     83   *bottom = tiling_data_.TileYIndexFromSrcCoord(content_rect.bottom() - 1);
     84 }
     85 
     86 gfx::Rect LayerTilingData::TileRect(const Tile* tile) const {
     87   gfx::Rect tile_rect = tiling_data_.TileBoundsWithBorder(tile->i(), tile->j());
     88   tile_rect.set_size(tile_size());
     89   return tile_rect;
     90 }
     91 
     92 Region LayerTilingData::OpaqueRegionInContentRect(
     93     gfx::Rect content_rect) const {
     94   if (content_rect.IsEmpty())
     95     return Region();
     96 
     97   Region opaque_region;
     98   int left, top, right, bottom;
     99   ContentRectToTileIndices(content_rect, &left, &top, &right, &bottom);
    100   for (int j = top; j <= bottom; ++j) {
    101     for (int i = left; i <= right; ++i) {
    102       Tile* tile = TileAt(i, j);
    103       if (!tile)
    104         continue;
    105 
    106       gfx::Rect tile_opaque_rect =
    107           gfx::IntersectRects(content_rect, tile->opaque_rect());
    108       opaque_region.Union(tile_opaque_rect);
    109     }
    110   }
    111   return opaque_region;
    112 }
    113 
    114 void LayerTilingData::SetBounds(gfx::Size size) {
    115   tiling_data_.SetTotalSize(size);
    116   if (size.IsEmpty()) {
    117     tiles_.clear();
    118     return;
    119   }
    120 
    121   // Any tiles completely outside our new bounds are invalid and should be
    122   // dropped.
    123   int left, top, right, bottom;
    124   ContentRectToTileIndices(
    125       gfx::Rect(size), &left, &top, &right, &bottom);
    126   std::vector<TileMapKey> invalid_tile_keys;
    127   for (TileMap::const_iterator it = tiles_.begin(); it != tiles_.end(); ++it) {
    128     if (it->first.first > right || it->first.second > bottom)
    129       invalid_tile_keys.push_back(it->first);
    130   }
    131   for (size_t i = 0; i < invalid_tile_keys.size(); ++i)
    132     tiles_.erase(invalid_tile_keys[i]);
    133 }
    134 
    135 }  // namespace cc
    136