The Tor Browser: widget/gonk/libui/SpriteController.h@fc2d59ddac77 (annotated)

widget/gonk/libui/SpriteController.h@fc2d59ddac77 (annotated)

widget/gonk/libui/SpriteController.h

Wed, 31 Dec 2014 07:22:50 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 07:22:50 +0100
branch: TOR_BUG_3246
changeset 4: fc2d59ddac77
permissions: -rw-r--r--

Correct previous dual key logic pending first delivery installment.

 /*
  * Copyright (C) 2011 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
 #ifndef _UI_SPRITES_H
 #define _UI_SPRITES_H
 #include <utils/RefBase.h>
 #include <utils/Looper.h>
 #ifdef HAVE_ANDROID_OS
 #include <gui/SurfaceComposerClient.h>
 #endif
 #include <SkBitmap.h>
 namespace android {
 /*
  * Transformation matrix for a sprite.
  */
 struct SpriteTransformationMatrix {
     inline SpriteTransformationMatrix() : dsdx(1.0f), dtdx(0.0f), dsdy(0.0f), dtdy(1.0f) { }
     inline SpriteTransformationMatrix(float dsdx, float dtdx, float dsdy, float dtdy) :
             dsdx(dsdx), dtdx(dtdx), dsdy(dsdy), dtdy(dtdy) { }
     float dsdx;
     float dtdx;
     float dsdy;
     float dtdy;
     inline bool operator== (const SpriteTransformationMatrix& other) {
         return dsdx == other.dsdx
                 && dtdx == other.dtdx
                 && dsdy == other.dsdy
                 && dtdy == other.dtdy;
     }
     inline bool operator!= (const SpriteTransformationMatrix& other) {
         return !(*this == other);
     }
 };
 /*
  * Icon that a sprite displays, including its hotspot.
  */
 struct SpriteIcon {
     inline SpriteIcon() : hotSpotX(0), hotSpotY(0) { }
 #ifdef HAVE_ANDROID_OS
     inline SpriteIcon(const SkBitmap& bitmap, float hotSpotX, float hotSpotY) :
             bitmap(bitmap), hotSpotX(hotSpotX), hotSpotY(hotSpotY) { }
     SkBitmap bitmap;
 #endif
     float hotSpotX;
     float hotSpotY;
     inline SpriteIcon copy() const {
 #ifdef HAVE_ANDROID_OS
         SkBitmap bitmapCopy;
         bitmap.copyTo(&bitmapCopy, SkBitmap::kARGB_8888_Config);
         return SpriteIcon(bitmapCopy, hotSpotX, hotSpotY);
 #else
 	return SpriteIcon();
 #endif
     }
     inline void reset() {
 #ifdef HAVE_ANDROID_OS
         bitmap.reset();
         hotSpotX = 0;
         hotSpotY = 0;
 #endif
     }
     inline bool isValid() const {
 #ifdef HAVE_ANDROID_OS
         return !bitmap.isNull() && !bitmap.empty();
 #else
 	return false;
 #endif
     }
 };
 /*
  * A sprite is a simple graphical object that is displayed on-screen above other layers.
  * The basic sprite class is an interface.
  * The implementation is provided by the sprite controller.
  */
 class Sprite : public RefBase {
 protected:
     Sprite() { }
     virtual ~Sprite() { }
 public:
     enum {
         // The base layer for pointer sprites.
         BASE_LAYER_POINTER = 0, // reserve space for 1 pointer
         // The base layer for spot sprites.
         BASE_LAYER_SPOT = 1, // reserve space for MAX_POINTER_ID spots
     };
     /* Sets the bitmap that is drawn by the sprite.
      * The sprite retains a copy of the bitmap for subsequent rendering. */
     virtual void setIcon(const SpriteIcon& icon) = 0;
     inline void clearIcon() {
         setIcon(SpriteIcon());
     }
     /* Sets whether the sprite is visible. */
     virtual void setVisible(bool visible) = 0;
     /* Sets the sprite position on screen, relative to the sprite's hot spot. */
     virtual void setPosition(float x, float y) = 0;
     /* Sets the layer of the sprite, relative to the system sprite overlay layer.
      * Layer 0 is the overlay layer, > 0 appear above this layer. */
     virtual void setLayer(int32_t layer) = 0;
     /* Sets the sprite alpha blend ratio between 0.0 and 1.0. */
     virtual void setAlpha(float alpha) = 0;
     /* Sets the sprite transformation matrix. */
     virtual void setTransformationMatrix(const SpriteTransformationMatrix& matrix) = 0;
 };
 /*
  * Displays sprites on the screen.
  *
  * This interface is used by PointerController and SpotController to draw pointers or
  * spot representations of fingers.  It is not intended for general purpose use
  * by other components.
  *
  * All sprite position updates and rendering is performed asynchronously.
  *
  * Clients are responsible for animating sprites by periodically updating their properties.
  */
 class SpriteController : public MessageHandler {
 protected:
     virtual ~SpriteController();
 public:
     SpriteController(const sp<Looper>& looper, int32_t overlayLayer);
     /* Creates a new sprite, initially invisible. */
     sp<Sprite> createSprite();
     /* Opens or closes a transaction to perform a batch of sprite updates as part of
      * a single operation such as setPosition and setAlpha.  It is not necessary to
      * open a transaction when updating a single property.
      * Calls to openTransaction() nest and must be matched by an equal number
      * of calls to closeTransaction(). */
     void openTransaction();
     void closeTransaction();
 private:
     enum {
         MSG_UPDATE_SPRITES,
         MSG_DISPOSE_SURFACES,
     };
     enum {
         DIRTY_BITMAP = 1 << 0,
         DIRTY_ALPHA = 1 << 1,
         DIRTY_POSITION = 1 << 2,
         DIRTY_TRANSFORMATION_MATRIX = 1 << 3,
         DIRTY_LAYER = 1 << 4,
         DIRTY_VISIBILITY = 1 << 5,
         DIRTY_HOTSPOT = 1 << 6,
     };
     /* Describes the state of a sprite.
      * This structure is designed so that it can be copied during updates so that
      * surfaces can be resized and redrawn without blocking the client by holding a lock
      * on the sprites for a long time.
      * Note that the SkBitmap holds a reference to a shared (and immutable) pixel ref. */
     struct SpriteState {
         inline SpriteState() :
                 dirty(0), visible(false),
                 positionX(0), positionY(0), layer(0), alpha(1.0f),
                 surfaceWidth(0), surfaceHeight(0), surfaceDrawn(false), surfaceVisible(false) {
         }
         uint32_t dirty;
         SpriteIcon icon;
         bool visible;
         float positionX;
         float positionY;
         int32_t layer;
         float alpha;
         SpriteTransformationMatrix transformationMatrix;
 #ifdef HAVE_ANDROID_OS
         sp<SurfaceControl> surfaceControl;
 #endif
         int32_t surfaceWidth;
         int32_t surfaceHeight;
         bool surfaceDrawn;
         bool surfaceVisible;
         inline bool wantSurfaceVisible() const {
             return visible && alpha > 0.0f && icon.isValid();
         }
     };
     /* Client interface for a sprite.
      * Requests acquire a lock on the controller, update local state and request the
      * controller to invalidate the sprite.
      * The real heavy lifting of creating, resizing and redrawing surfaces happens
      * asynchronously with no locks held except in short critical section to copy
      * the sprite state before the work and update the sprite surface control afterwards.
      */
     class SpriteImpl : public Sprite {
     protected:
         virtual ~SpriteImpl();
     public:
         SpriteImpl(const sp<SpriteController> controller);
         virtual void setIcon(const SpriteIcon& icon);
         virtual void setVisible(bool visible);
         virtual void setPosition(float x, float y);
         virtual void setLayer(int32_t layer);
         virtual void setAlpha(float alpha);
         virtual void setTransformationMatrix(const SpriteTransformationMatrix& matrix);
         inline const SpriteState& getStateLocked() const {
             return mLocked.state;
         }
         inline void resetDirtyLocked() {
             mLocked.state.dirty = 0;
         }
 #ifdef HAVE_ANDROID_OS
         inline void setSurfaceLocked(const sp<SurfaceControl>& surfaceControl,
                 int32_t width, int32_t height, bool drawn, bool visible) {
             mLocked.state.surfaceControl = surfaceControl;
             mLocked.state.surfaceWidth = width;
             mLocked.state.surfaceHeight = height;
             mLocked.state.surfaceDrawn = drawn;
             mLocked.state.surfaceVisible = visible;
         }
 #endif
     private:
         sp<SpriteController> mController;
         struct Locked {
             SpriteState state;
         } mLocked; // guarded by mController->mLock
         void invalidateLocked(uint32_t dirty);
     };
     /* Stores temporary information collected during the sprite update cycle. */
     struct SpriteUpdate {
         inline SpriteUpdate() : surfaceChanged(false) { }
         inline SpriteUpdate(const sp<SpriteImpl> sprite, const SpriteState& state) :
                 sprite(sprite), state(state), surfaceChanged(false) {
         }
         sp<SpriteImpl> sprite;
         SpriteState state;
         bool surfaceChanged;
     };
     mutable Mutex mLock;
     sp<Looper> mLooper;
     const int32_t mOverlayLayer;
 #ifdef HAVE_ANDROID_OS
     sp<WeakMessageHandler> mHandler;
     sp<SurfaceComposerClient> mSurfaceComposerClient;
 #endif
     struct Locked {
         Vector<sp<SpriteImpl> > invalidatedSprites;
 #ifdef HAVE_ANDROID_OS
         Vector<sp<SurfaceControl> > disposedSurfaces;
 #endif
         uint32_t transactionNestingCount;
         bool deferredSpriteUpdate;
     } mLocked; // guarded by mLock
     void invalidateSpriteLocked(const sp<SpriteImpl>& sprite);
 #ifdef HAVE_ANDROID_OS
     void disposeSurfaceLocked(const sp<SurfaceControl>& surfaceControl);
     void handleMessage(const Message& message);
 #endif
     void doUpdateSprites();
     void doDisposeSurfaces();
     void ensureSurfaceComposerClient();
 #ifdef HAVE_ANDROID_OS
     sp<SurfaceControl> obtainSurface(int32_t width, int32_t height);
 #endif
 };
 } // namespace android
 #endif // _UI_SPRITES_H

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widget/gonk/libui/SpriteController.h@fc2d59ddac77 (annotated)

widget/gonk/libui/SpriteController.h