Part 8 of cc/ directory shuffles: resources

cc/tile_priority.h

-// Copyright 2012 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef CC_TILE_PRIORITY_H_
-#define CC_TILE_PRIORITY_H_
-
-#include <limits>
-
-#include "base/memory/ref_counted.h"
-#include "base/memory/scoped_ptr.h"
-#include "cc/picture_pile.h"
-#include "ui/gfx/quad_f.h"
-#include "ui/gfx/rect.h"
-#include "ui/gfx/size.h"
-
-namespace base {
-class Value;
-}
-
-namespace cc {
-
-enum WhichTree {
-  // Note: these must be 0 and 1 because we index with them in various places,
-  // e.g. in Tile::priority_.
-  ACTIVE_TREE = 0,
-  PENDING_TREE = 1,
-  NUM_TREES = 2
-  // Be sure to update WhichTreeAsValue when adding new fields.
-};
-scoped_ptr<base::Value> WhichTreeAsValue(
-    WhichTree tree);
-
-enum TileResolution {
-  LOW_RESOLUTION = 0 ,
-  HIGH_RESOLUTION = 1,
-  NON_IDEAL_RESOLUTION = 2,
-};
-scoped_ptr<base::Value> TileResolutionAsValue(
-    TileResolution resolution);
-
-struct CC_EXPORT TilePriority {
-  TilePriority()
-     : is_live(false),
-       resolution(NON_IDEAL_RESOLUTION),
-       time_to_visible_in_seconds(std::numeric_limits<float>::infinity()),
-       distance_to_visible_in_pixels(std::numeric_limits<float>::infinity()) {}
-
-  TilePriority(
-    TileResolution resolution,
-    float time_to_visible_in_seconds,
-    float distance_to_visible_in_pixels)
-     : is_live(true),
-       resolution(resolution),
-       time_to_visible_in_seconds(time_to_visible_in_seconds),
-       distance_to_visible_in_pixels(distance_to_visible_in_pixels) {}
-
-  TilePriority(const TilePriority& active, const TilePriority& pending) {
-    if (!pending.is_live) {
-      if (!active.is_live) {
-        is_live = false;
-        return;
-      }
-      is_live = true;
-      resolution = active.resolution;
-      time_to_visible_in_seconds = active.time_to_visible_in_seconds;
-      distance_to_visible_in_pixels = active.distance_to_visible_in_pixels;
-      return;
-    } else if (!active.is_live) {
-      is_live = true;
-      resolution = pending.resolution;
-      time_to_visible_in_seconds = pending.time_to_visible_in_seconds;
-      distance_to_visible_in_pixels = pending.distance_to_visible_in_pixels;
-      return;
-    }
-
-    is_live = true;
-    if (active.resolution == HIGH_RESOLUTION ||
-        pending.resolution == HIGH_RESOLUTION)
-      resolution = HIGH_RESOLUTION;
-    else if (active.resolution == LOW_RESOLUTION ||
-             pending.resolution == LOW_RESOLUTION)
-      resolution = LOW_RESOLUTION;
-    else
-      resolution = NON_IDEAL_RESOLUTION;
-
-    time_to_visible_in_seconds =
-      std::min(active.time_to_visible_in_seconds,
-               pending.time_to_visible_in_seconds);
-    distance_to_visible_in_pixels =
-      std::min(active.distance_to_visible_in_pixels,
-               pending.distance_to_visible_in_pixels);
-  }
-  void set_current_screen_quad(const gfx::QuadF& q) { current_screen_quad = q; }
-
-  scoped_ptr<base::Value> AsValue() const;
-
-  static const float kMaxDistanceInContentSpace;
-  static const int64 kNumTilesToCoverWithInflatedViewportRectForPrioritization;
-
-  static inline float manhattanDistance(const gfx::RectF& a, const gfx::RectF& b) {
-    // Compute the union explicitly.
-    gfx::RectF c = gfx::RectF(
-        std::min(a.x(), b.x()),
-        std::min(a.y(), b.y()),
-        std::max(a.right(), b.right()) - std::min(a.x(), b.x()),
-        std::max(a.bottom(), b.bottom()) - std::min(a.y(), b.y()));
-
-    // Rects touching the edge of the screen should not be considered visible.
-    // So we add 1 pixel here to avoid that situation.
-    float x = std::max(0.0f, c.width() - a.width() - b.width() + 1.0f);
-    float y = std::max(0.0f, c.height() - a.height() - b.height() + 1.0f);
-    return (x + y);
-  }
-
-  // Calculate the time for the |current_bounds| to intersect with the
-  // |target_bounds| given its previous location and time delta.
-  // This function should work for both scaling and scrolling case.
-  static float TimeForBoundsToIntersect(const gfx::RectF& previous_bounds,
-                                        const gfx::RectF& current_bounds,
-                                        float time_delta,
-                                        const gfx::RectF& target_bounds);
-
-  // If a tile is not live, then all other fields are invalid.
-  bool is_live;
-  TileResolution resolution;
-  float time_to_visible_in_seconds;
-  float distance_to_visible_in_pixels;
-
-private:
-  gfx::QuadF current_screen_quad;
-};
-
-enum TileMemoryLimitPolicy {
-  // Nothing.
-  ALLOW_NOTHING,
-
-  // You might be made visible, but you're not being interacted with.
-  ALLOW_ABSOLUTE_MINIMUM, // Tall.
-
-  // You're being interacted with, but we're low on memory.
-  ALLOW_PREPAINT_ONLY, // Grande.
-
-  // You're the only thing in town. Go crazy.
-  ALLOW_ANYTHING, // Venti.
-
-  // Be sure to update TreePriorityAsValue when adding new fields.
-};
-scoped_ptr<base::Value> TileMemoryLimitPolicyAsValue(
-    TileMemoryLimitPolicy policy);
-
-enum TreePriority {
-  SAME_PRIORITY_FOR_BOTH_TREES,
-  SMOOTHNESS_TAKES_PRIORITY,
-  NEW_CONTENT_TAKES_PRIORITY
-
-  // Be sure to update TreePriorityAsValue when adding new fields.
-};
-scoped_ptr<base::Value> TreePriorityAsValue(TreePriority prio);
-
-class GlobalStateThatImpactsTilePriority {
- public:
-  GlobalStateThatImpactsTilePriority()
-    : memory_limit_policy(ALLOW_NOTHING)
-    , memory_limit_in_bytes(0)
-    , tree_priority(SAME_PRIORITY_FOR_BOTH_TREES) {
-  }
-
-  TileMemoryLimitPolicy memory_limit_policy;
-
-  size_t memory_limit_in_bytes;
-
-  TreePriority tree_priority;
-
-  scoped_ptr<base::Value> AsValue() const;
-};
-
-}  // namespace cc
-
-#endif  // CC_TILE_PRIORITY_H_