The Tor Browser: layout/base/nsDisplayListInvalidation.h@b8a032363ba2

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

     1 /*-*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-

     2  * This Source Code Form is subject to the terms of the Mozilla Public

     3  * License, v. 2.0. If a copy of the MPL was not distributed with this file,

     4  * You can obtain one at http://mozilla.org/MPL/2.0/. */

     6 #ifndef NSDISPLAYLISTINVALIDATION_H_

     7 #define NSDISPLAYLISTINVALIDATION_H_

     9 #include "mozilla/Attributes.h"

    10 #include "nsRect.h"

    11 #include "nsColor.h"

    13 class nsDisplayItem;

    14 class nsDisplayListBuilder;

    15 class nsDisplayBackgroundImage;

    16 class nsDisplayThemedBackground;

    18 /**

    19  * This stores the geometry of an nsDisplayItem, and the area

    20  * that will be affected when painting the item.

    21  *

    22  * It is used to retain information about display items so they

    23  * can be compared against new display items in the next paint.

    24  */

    25 class nsDisplayItemGeometry

    26 {

    27 public:

    28   nsDisplayItemGeometry(nsDisplayItem* aItem, nsDisplayListBuilder* aBuilder);

    29   virtual ~nsDisplayItemGeometry();

    31   /**

    32    * Compute the area required to be invalidated if this

    33    * display item is removed.

    34    */

    35   const nsRect& ComputeInvalidationRegion() { return mBounds; }

    37   /**

    38    * Shifts all retained areas of the nsDisplayItemGeometry by the given offset.

    39    *

    40    * This is used to compensate for scrolling, since the destination buffer

    41    * can scroll without requiring a full repaint.

    42    *

    43    * @param aOffset Offset to shift by.

    44    */

    45   virtual void MoveBy(const nsPoint& aOffset) = 0;

    47   /**

    48    * Bounds of the display item

    49    */

    50   nsRect mBounds;

    51 };

    53 /**

    54  * A default geometry implementation, used by nsDisplayItem. Retains

    55  * and compares the bounds, and border rect.

    56  *

    57  * This should be sufficient for the majority of display items.

    58  */

    59 class nsDisplayItemGenericGeometry : public nsDisplayItemGeometry

    60 {

    61 public:

    62   nsDisplayItemGenericGeometry(nsDisplayItem* aItem, nsDisplayListBuilder* aBuilder);

    64   virtual void MoveBy(const nsPoint& aOffset) MOZ_OVERRIDE;

    66   nsRect mBorderRect;

    67 };

    69 class nsDisplayItemBoundsGeometry : public nsDisplayItemGeometry

    70 {

    71 public:

    72   nsDisplayItemBoundsGeometry(nsDisplayItem* aItem, nsDisplayListBuilder* aBuilder);

    74   virtual void MoveBy(const nsPoint& aOffset) MOZ_OVERRIDE;

    76   bool mHasRoundedCorners;

    77 };

    79 class nsDisplayBorderGeometry : public nsDisplayItemGeometry

    80 {

    81 public:

    82   nsDisplayBorderGeometry(nsDisplayItem* aItem, nsDisplayListBuilder* aBuilder);

    84   virtual void MoveBy(const nsPoint& aOffset) MOZ_OVERRIDE;

    86   nsRect mContentRect;

    87 };

    89 class nsDisplayBackgroundGeometry : public nsDisplayItemGeometry

    90 {

    91 public:

    92   nsDisplayBackgroundGeometry(nsDisplayBackgroundImage* aItem, nsDisplayListBuilder* aBuilder);

    94   virtual void MoveBy(const nsPoint& aOffset) MOZ_OVERRIDE;

    96   nsRect mPositioningArea;

    97 };

    99 class nsDisplayThemedBackgroundGeometry : public nsDisplayItemGeometry

   100 {

   101 public:

   102   nsDisplayThemedBackgroundGeometry(nsDisplayThemedBackground* aItem, nsDisplayListBuilder* aBuilder);

   104   virtual void MoveBy(const nsPoint& aOffset) MOZ_OVERRIDE;

   106   nsRect mPositioningArea;

   107   bool mWindowIsActive;

   108 };

   110 class nsDisplayBoxShadowInnerGeometry : public nsDisplayItemGeometry

   111 {

   112 public:

   113   nsDisplayBoxShadowInnerGeometry(nsDisplayItem* aItem, nsDisplayListBuilder* aBuilder);

   115   virtual void MoveBy(const nsPoint& aOffset) MOZ_OVERRIDE;

   117   nsRect mPaddingRect;

   118 };

   120 class nsDisplaySolidColorGeometry : public nsDisplayItemBoundsGeometry

   121 {

   122 public:

   123   nsDisplaySolidColorGeometry(nsDisplayItem* aItem,

   124                               nsDisplayListBuilder* aBuilder,

   125                               nscolor aColor)

   126     : nsDisplayItemBoundsGeometry(aItem, aBuilder)

   127     , mColor(aColor)

   128   { }

   130   nscolor mColor;

   131 };

   133 #endif /*NSDISPLAYLISTINVALIDATION_H_*/

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