|
| 1 | +#include "flutter/flow/diff_context.h" |
| 2 | +#include "flutter/flow/layers/layer.h" |
| 3 | + |
| 4 | +namespace flutter { |
| 5 | + |
| 6 | +#ifdef FLUTTER_ENABLE_DIFF_CONTEXT |
| 7 | + |
| 8 | +DiffContext::DiffContext(SkISize frame_size, |
| 9 | + double frame_device_pixel_ratio, |
| 10 | + PaintRegionMap& this_frame_paint_region_map, |
| 11 | + const PaintRegionMap& last_frame_paint_region_map) |
| 12 | + : rects_(std::make_shared<std::vector<SkRect>>()), |
| 13 | + frame_size_(frame_size), |
| 14 | + frame_device_pixel_ratio_(frame_device_pixel_ratio), |
| 15 | + this_frame_paint_region_map_(this_frame_paint_region_map), |
| 16 | + last_frame_paint_region_map_(last_frame_paint_region_map) {} |
| 17 | + |
| 18 | +void DiffContext::BeginSubtree() { |
| 19 | + state_stack_.push_back(state_); |
| 20 | + state_.rect_index_ = rects_->size(); |
| 21 | +} |
| 22 | + |
| 23 | +void DiffContext::EndSubtree() { |
| 24 | + FML_DCHECK(!state_stack_.empty()); |
| 25 | + state_ = std::move(state_stack_.back()); |
| 26 | + state_stack_.pop_back(); |
| 27 | +} |
| 28 | + |
| 29 | +DiffContext::State::State() |
| 30 | + : dirty(false), cull_rect(kGiantRect), rect_index_(0) {} |
| 31 | + |
| 32 | +void DiffContext::PushTransform(const SkMatrix& transform) { |
| 33 | + state_.transform.preConcat(transform); |
| 34 | + SkMatrix inverse_transform; |
| 35 | + // Perspective projections don't produce rectangles that are useful for |
| 36 | + // culling for some reason. |
| 37 | + if (!transform.hasPerspective() && transform.invert(&inverse_transform)) { |
| 38 | + inverse_transform.mapRect(&state_.cull_rect); |
| 39 | + } else { |
| 40 | + state_.cull_rect = kGiantRect; |
| 41 | + } |
| 42 | +} |
| 43 | + |
| 44 | +Damage DiffContext::ComputeDamage( |
| 45 | + const SkIRect& accumulated_buffer_damage) const { |
| 46 | + SkRect buffer_damage = SkRect::Make(accumulated_buffer_damage); |
| 47 | + buffer_damage.join(damage_); |
| 48 | + SkRect frame_damage(damage_); |
| 49 | + |
| 50 | + for (const auto& r : readbacks_) { |
| 51 | + SkRect rect = SkRect::Make(r.rect); |
| 52 | + if (rect.intersects(frame_damage)) { |
| 53 | + frame_damage.join(rect); |
| 54 | + } |
| 55 | + if (rect.intersects(buffer_damage)) { |
| 56 | + buffer_damage.join(rect); |
| 57 | + } |
| 58 | + } |
| 59 | + |
| 60 | + Damage res; |
| 61 | + buffer_damage.roundOut(&res.buffer_damage); |
| 62 | + frame_damage.roundOut(&res.frame_damage); |
| 63 | + |
| 64 | + SkIRect frame_clip = SkIRect::MakeSize(frame_size_); |
| 65 | + res.buffer_damage.intersect(frame_clip); |
| 66 | + res.frame_damage.intersect(frame_clip); |
| 67 | + return res; |
| 68 | +} |
| 69 | + |
| 70 | +bool DiffContext::PushCullRect(const SkRect& clip) { |
| 71 | + return state_.cull_rect.intersect(clip); |
| 72 | +} |
| 73 | + |
| 74 | +void DiffContext::MarkSubtreeDirty(const PaintRegion& previous_paint_region) { |
| 75 | + FML_DCHECK(!IsSubtreeDirty()); |
| 76 | + if (previous_paint_region.is_valid()) { |
| 77 | + AddDamage(previous_paint_region); |
| 78 | + } |
| 79 | + state_.dirty = true; |
| 80 | +} |
| 81 | + |
| 82 | +void DiffContext::AddLayerBounds(const SkRect& rect) { |
| 83 | + SkRect r(rect); |
| 84 | + if (r.intersect(state_.cull_rect)) { |
| 85 | + state_.transform.mapRect(&r); |
| 86 | + if (!r.isEmpty()) { |
| 87 | + rects_->push_back(r); |
| 88 | + if (IsSubtreeDirty()) { |
| 89 | + AddDamage(r); |
| 90 | + } |
| 91 | + } |
| 92 | + } |
| 93 | +} |
| 94 | + |
| 95 | +void DiffContext::AddExistingPaintRegion(const PaintRegion& region) { |
| 96 | + // Adding paint region for retained layer implies that current subtree is not |
| 97 | + // dirty, so we know, for example, that the inherited transforms must match |
| 98 | + FML_DCHECK(!IsSubtreeDirty()); |
| 99 | + if (region.is_valid()) { |
| 100 | + rects_->insert(rects_->end(), region.begin(), region.end()); |
| 101 | + } |
| 102 | +} |
| 103 | + |
| 104 | +void DiffContext::AddReadbackRegion(const SkIRect& rect) { |
| 105 | + Readback readback; |
| 106 | + readback.rect = rect; |
| 107 | + readback.position = rects_->size(); |
| 108 | + // Push empty rect as a placeholder for position in current subtree |
| 109 | + rects_->push_back(SkRect::MakeEmpty()); |
| 110 | + readbacks_.push_back(std::move(readback)); |
| 111 | +} |
| 112 | + |
| 113 | +PaintRegion DiffContext::CurrentSubtreeRegion() const { |
| 114 | + bool has_readback = std::any_of( |
| 115 | + readbacks_.begin(), readbacks_.end(), |
| 116 | + [&](const Readback& r) { return r.position >= state_.rect_index_; }); |
| 117 | + return PaintRegion(rects_, state_.rect_index_, rects_->size(), has_readback); |
| 118 | +} |
| 119 | + |
| 120 | +void DiffContext::AddDamage(const PaintRegion& damage) { |
| 121 | + FML_DCHECK(damage.is_valid()); |
| 122 | + for (const auto& r : damage) { |
| 123 | + damage_.join(r); |
| 124 | + } |
| 125 | +} |
| 126 | + |
| 127 | +void DiffContext::AddDamage(const SkRect& rect) { |
| 128 | + damage_.join(rect); |
| 129 | +} |
| 130 | + |
| 131 | +void DiffContext::SetLayerPaintRegion(const Layer* layer, |
| 132 | + const PaintRegion& region) { |
| 133 | + this_frame_paint_region_map_[layer->unique_id()] = region; |
| 134 | +} |
| 135 | + |
| 136 | +PaintRegion DiffContext::GetOldLayerPaintRegion(const Layer* layer) const { |
| 137 | + auto i = last_frame_paint_region_map_.find(layer->unique_id()); |
| 138 | + if (i != last_frame_paint_region_map_.end()) { |
| 139 | + return i->second; |
| 140 | + } else { |
| 141 | + // This is valid when Layer::PreservePaintRegion is called for retained |
| 142 | + // layer with zero sized parent clip (these layers are not diffed) |
| 143 | + return PaintRegion(); |
| 144 | + } |
| 145 | +} |
| 146 | + |
| 147 | +void DiffContext::Statistics::LogStatistics() { |
| 148 | +#if !FLUTTER_RELEASE |
| 149 | + FML_TRACE_COUNTER("flutter", "DiffContext", reinterpret_cast<int64_t>(this), |
| 150 | + "NewPictures", new_pictures_, "PicturesTooComplexToCompare", |
| 151 | + pictures_too_complex_to_compare_, "DeepComparePictures", |
| 152 | + deep_compare_pictures_, "SameInstancePictures", |
| 153 | + same_instance_pictures_, |
| 154 | + "DifferentInstanceButEqualPictures", |
| 155 | + different_instance_but_equal_pictures_); |
| 156 | +#endif // !FLUTTER_RELEASE |
| 157 | +} |
| 158 | + |
| 159 | +#endif // FLUTTER_ENABLE_DIFF_CONTEXT |
| 160 | + |
| 161 | +} // namespace flutter |
0 commit comments