Handle nested position:sticky elements correctly (compositor)

cc/trees/property_tree.cc

 // Copyright 2014 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.
 
 #include <stddef.h>
 
 #include <set>
 #include <vector>
 
 #include "base/logging.h"
@@ skipping 328 matching lines @@
   CombineTransformsBetween(dest_id, source_id, &dest_to_source);
   gfx::Transform source_to_dest;
   bool all_are_invertible = dest_to_source.GetInverse(&source_to_dest);
   transform->PreconcatTransform(source_to_dest);
   return all_are_invertible;
 }
 
 gfx::Vector2dF StickyPositionOffset(TransformTree* tree, TransformNode* node) {
   if (node->sticky_position_constraint_id == -1)
     return gfx::Vector2dF();
-  const StickyPositionNodeData* sticky_data =
-      tree->StickyPositionData(node->id);
-  const LayerStickyPositionConstraint& constraint = sticky_data->constraints;
+  StickyPositionNodeData* sticky_data = tree->StickyPositionData(node->id);
+  LayerStickyPositionConstraint& constraint = sticky_data->constraints;
   ScrollNode* scroll_node =
       tree->property_trees()->scroll_tree.Node(sticky_data->scroll_ancestor);
   gfx::ScrollOffset scroll_offset =
       tree->property_trees()->scroll_tree.current_scroll_offset(
           scroll_node->owning_layer_id);
   gfx::PointF scroll_position(scroll_offset.x(), scroll_offset.y());
   TransformNode* scroll_ancestor_transform_node =
       tree->Node(scroll_node->transform_id);
   if (scroll_ancestor_transform_node->scrolls) {
     // The scroll position does not include snapping which shifts the scroll
     // offset to align to a pixel boundary, we need to manually include it here.
     // In this case, snapping is caused by a scroll.
     scroll_position -= scroll_ancestor_transform_node->snap_amount;
   }
 
   gfx::RectF clip(
       scroll_position,
       gfx::SizeF(tree->property_trees()->scroll_tree.scroll_clip_layer_bounds(
           scroll_node->id)));
-  gfx::Vector2dF sticky_offset(
-      constraint.scroll_container_relative_sticky_box_rect.OffsetFromOrigin());
   gfx::Vector2dF layer_offset(sticky_data->main_thread_offset);
 
   // In each of the following cases, we measure the limit which is the point
   // that the element should stick to, clamping on one side to 0 (because sticky
   // only pushes elements in one direction). Then we clamp to how far we can
   // push the element in that direction without being pushed outside of its
   // containing block.
   //
   // Note: The order of applying the sticky constraints is applied such that
   // left offset takes precedence over right offset, and top takes precedence
   // over bottom offset.
+
+  gfx::Vector2dF ancestor_sticky_box_offset;
+  if (sticky_data->nearest_node_shifting_sticky_box >= 0) {
+    ancestor_sticky_box_offset =
+        tree->StickyPositionData(sticky_data->nearest_node_shifting_sticky_box)
+            ->constraints.total_sticky_box_sticky_offset;
+  }
+
+  gfx::Vector2dF ancestor_containing_block_offset;
+  if (sticky_data->nearest_node_shifting_containing_block >= 0) {
+    ancestor_containing_block_offset =
+        tree->StickyPositionData(
+                sticky_data->nearest_node_shifting_containing_block)
+            ->constraints.total_containing_block_sticky_offset;
+  }
+
+  gfx::Rect sticky_box_rect =
+      constraint.scroll_container_relative_sticky_box_rect;
+  gfx::Rect containing_block_rect =
+      constraint.scroll_container_relative_containing_block_rect;
+  sticky_box_rect += gfx::ToFlooredVector2d(ancestor_sticky_box_offset +

[flackr, 2017/03/13 19:49:45]

This loss of precision seems dangerous, we could end up causing jitter on a high
dpi device (e.g. android device) if we don't track the full offset that has
already been applied.

+                                            ancestor_containing_block_offset);
+  containing_block_rect +=
+      gfx::ToFlooredVector2d(ancestor_containing_block_offset);
+
+  gfx::Vector2dF sticky_offset(sticky_box_rect.OffsetFromOrigin());
+
   if (constraint.is_anchored_right) {
     float right_limit = clip.right() - constraint.right_offset;
-    float right_delta = std::min<float>(
-        0, right_limit -
-               constraint.scroll_container_relative_sticky_box_rect.right());
-    float available_space = std::min<float>(
-        0, constraint.scroll_container_relative_containing_block_rect.x() -
-               constraint.scroll_container_relative_sticky_box_rect.x());
+    float right_delta =
+        std::min<float>(0, right_limit - sticky_box_rect.right());
+    float available_space =
+        std::min<float>(0, containing_block_rect.x() - sticky_box_rect.x());
     if (right_delta < available_space)
       right_delta = available_space;
     sticky_offset.set_x(sticky_offset.x() + right_delta);
   }
   if (constraint.is_anchored_left) {
     float left_limit = clip.x() + constraint.left_offset;
-    float left_delta = std::max<float>(
-        0,
-        left_limit - constraint.scroll_container_relative_sticky_box_rect.x());
+    float left_delta = std::max<float>(0, left_limit - sticky_box_rect.x());
     float available_space = std::max<float>(
-        0, constraint.scroll_container_relative_containing_block_rect.right() -
-               constraint.scroll_container_relative_sticky_box_rect.right());
+        0, containing_block_rect.right() - sticky_box_rect.right());
     if (left_delta > available_space)
       left_delta = available_space;
     sticky_offset.set_x(sticky_offset.x() + left_delta);
   }
   if (constraint.is_anchored_bottom) {
     float bottom_limit = clip.bottom() - constraint.bottom_offset;
-    float bottom_delta = std::min<float>(
-        0, bottom_limit -
-               constraint.scroll_container_relative_sticky_box_rect.bottom());
-    float available_space = std::min<float>(
-        0, constraint.scroll_container_relative_containing_block_rect.y() -
-               constraint.scroll_container_relative_sticky_box_rect.y());
+    float bottom_delta =
+        std::min<float>(0, bottom_limit - sticky_box_rect.bottom());
+    float available_space =
+        std::min<float>(0, containing_block_rect.y() - sticky_box_rect.y());
     if (bottom_delta < available_space)
       bottom_delta = available_space;
     sticky_offset.set_y(sticky_offset.y() + bottom_delta);
   }
   if (constraint.is_anchored_top) {
     float top_limit = clip.y() + constraint.top_offset;
-    float top_delta = std::max<float>(
-        0,
-        top_limit - constraint.scroll_container_relative_sticky_box_rect.y());
+    float top_delta = std::max<float>(0, top_limit - sticky_box_rect.y());
     float available_space = std::max<float>(
-        0, constraint.scroll_container_relative_containing_block_rect.bottom() -
-               constraint.scroll_container_relative_sticky_box_rect.bottom());
+        0, containing_block_rect.bottom() - sticky_box_rect.bottom());
     if (top_delta > available_space)
       top_delta = available_space;
     sticky_offset.set_y(sticky_offset.y() + top_delta);
   }
+
+  constraint.total_sticky_box_sticky_offset =
+      ancestor_sticky_box_offset + sticky_offset -
+      sticky_box_rect.OffsetFromOrigin();
+  constraint.total_containing_block_sticky_offset =
+      ancestor_sticky_box_offset + ancestor_containing_block_offset +
+      sticky_offset - sticky_box_rect.OffsetFromOrigin();
+
   return sticky_offset - layer_offset - node->source_to_parent -
-         constraint.scroll_container_relative_sticky_box_rect
-             .OffsetFromOrigin();
+         sticky_box_rect.OffsetFromOrigin();
 }
 
 void TransformTree::UpdateLocalTransform(TransformNode* node) {
   gfx::Transform transform = node->post_local;
   if (NeedsSourceToParentUpdate(node)) {
     gfx::Transform to_parent;
     ComputeTranslation(node->source_node_id, node->parent_id, &to_parent);
     gfx::Vector2dF unsnapping;
     TransformNode* current;
     TransformNode* parent_node;
@@ skipping 1669 matching lines @@
   const EffectNode* effect_node = effect_tree.Node(effect_id);
 
   if (effect_node->surface_contents_scale.x() != 0.0 &&
       effect_node->surface_contents_scale.y() != 0.0)
     screen_space_transform.Scale(1.0 / effect_node->surface_contents_scale.x(),
                                  1.0 / effect_node->surface_contents_scale.y());
   return screen_space_transform;
 }
 
 }  // namespace cc