387 lines
12 KiB
C++
387 lines
12 KiB
C++
/*
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* Copyright (C) 2007 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ANDROID_LAYER_BASE_H
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#define ANDROID_LAYER_BASE_H
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#include <stdint.h>
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#include <sys/types.h>
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#include <EGL/egl.h>
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#include <EGL/eglext.h>
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#include <GLES/gl.h>
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#include <utils/RefBase.h>
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#include <utils/String8.h>
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#include <ui/Region.h>
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#include <gui/ISurfaceComposerClient.h>
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#include <private/gui/LayerState.h>
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#include "Transform.h"
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#include "DisplayHardware/HWComposer.h"
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namespace android {
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// ---------------------------------------------------------------------------
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class Client;
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class DisplayDevice;
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class GraphicBuffer;
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class Layer;
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class LayerBaseClient;
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class SurfaceFlinger;
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// ---------------------------------------------------------------------------
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/*
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* Layers are rectangular graphic entities, internal to SurfaceFlinger.
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* They have properties including width, height, Z-depth, and 2D
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* transformations (chiefly translation and 90-degree rotations).
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*
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* Layers are organized into "layer stacks". Each layer is a member of
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* exactly one layer stack, identified by an integer in Layer::State. A
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* given layer stack may appear on more than one display.
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*
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* Notable subclasses (below LayerBaseClient) include Layer, LayerDim, and
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* LayerScreenshot.
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*/
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class LayerBase : virtual public RefBase
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{
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static int32_t sSequence;
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public:
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LayerBase(SurfaceFlinger* flinger);
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mutable bool contentDirty;
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// regions below are in window-manager space
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Region visibleRegion;
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Region coveredRegion;
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Region visibleNonTransparentRegion;
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int32_t sequence;
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struct Geometry {
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uint32_t w;
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uint32_t h;
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Rect crop;
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inline bool operator == (const Geometry& rhs) const {
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return (w==rhs.w && h==rhs.h && crop==rhs.crop);
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}
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inline bool operator != (const Geometry& rhs) const {
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return !operator == (rhs);
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}
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};
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struct State {
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Geometry active;
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Geometry requested;
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uint32_t z;
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uint32_t layerStack;
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uint8_t alpha;
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uint8_t flags;
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uint8_t reserved[2];
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int32_t sequence; // changes when visible regions can change
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Transform transform;
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Region transparentRegion;
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};
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class LayerMesh {
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friend class LayerBase;
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GLfloat mVertices[4][2];
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size_t mNumVertices;
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public:
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LayerMesh() : mNumVertices(4) { }
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GLfloat const* getVertices() const {
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return &mVertices[0][0];
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}
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size_t getVertexCount() const {
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return mNumVertices;
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}
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};
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virtual void setName(const String8& name);
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String8 getName() const;
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// modify current state
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bool setPosition(float x, float y);
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bool setLayer(uint32_t z);
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bool setSize(uint32_t w, uint32_t h);
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bool setAlpha(uint8_t alpha);
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bool setMatrix(const layer_state_t::matrix22_t& matrix);
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bool setTransparentRegionHint(const Region& transparent);
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bool setFlags(uint8_t flags, uint8_t mask);
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bool setCrop(const Rect& crop);
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bool setLayerStack(uint32_t layerStack);
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void commitTransaction();
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bool requestTransaction();
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void forceVisibilityTransaction();
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uint32_t getTransactionFlags(uint32_t flags);
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uint32_t setTransactionFlags(uint32_t flags);
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void computeGeometry(const sp<const DisplayDevice>& hw, LayerMesh* mesh) const;
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Rect computeBounds() const;
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virtual sp<LayerBaseClient> getLayerBaseClient() const;
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virtual sp<Layer> getLayer() const;
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virtual const char* getTypeId() const { return "LayerBase"; }
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virtual void setGeometry(const sp<const DisplayDevice>& hw,
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HWComposer::HWCLayerInterface& layer);
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virtual void setPerFrameData(const sp<const DisplayDevice>& hw,
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HWComposer::HWCLayerInterface& layer);
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virtual void setAcquireFence(const sp<const DisplayDevice>& hw,
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HWComposer::HWCLayerInterface& layer);
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/**
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* draw - performs some global clipping optimizations
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* and calls onDraw().
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* Typically this method is not overridden, instead implement onDraw()
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* to perform the actual drawing.
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*/
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virtual void draw(const sp<const DisplayDevice>& hw, const Region& clip) const;
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virtual void draw(const sp<const DisplayDevice>& hw);
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/**
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* onDraw - draws the surface.
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*/
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virtual void onDraw(const sp<const DisplayDevice>& hw, const Region& clip) const = 0;
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/**
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* initStates - called just after construction
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*/
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virtual void initStates(uint32_t w, uint32_t h, uint32_t flags);
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/**
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* doTransaction - process the transaction. This is a good place to figure
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* out which attributes of the surface have changed.
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*/
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virtual uint32_t doTransaction(uint32_t transactionFlags);
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/**
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* setVisibleRegion - called to set the new visible region. This gives
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* a chance to update the new visible region or record the fact it changed.
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*/
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virtual void setVisibleRegion(const Region& visibleRegion);
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/**
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* setCoveredRegion - called when the covered region changes. The covered
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* region corresponds to any area of the surface that is covered
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* (transparently or not) by another surface.
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*/
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virtual void setCoveredRegion(const Region& coveredRegion);
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/**
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* setVisibleNonTransparentRegion - called when the visible and
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* non-transparent region changes.
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*/
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virtual void setVisibleNonTransparentRegion(const Region&
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visibleNonTransparentRegion);
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/**
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* latchBuffer - called each time the screen is redrawn and returns whether
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* the visible regions need to be recomputed (this is a fairly heavy
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* operation, so this should be set only if needed). Typically this is used
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* to figure out if the content or size of a surface has changed.
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*/
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virtual Region latchBuffer(bool& recomputeVisibleRegions);
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/**
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* isOpaque - true if this surface is opaque
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*/
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virtual bool isOpaque() const { return true; }
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/**
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* needsDithering - true if this surface needs dithering
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*/
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virtual bool needsDithering() const { return false; }
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/**
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* needsLinearFiltering - true if this surface's state requires filtering
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*/
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virtual bool needsFiltering(const sp<const DisplayDevice>& hw) const;
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/**
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* isSecure - true if this surface is secure, that is if it prevents
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* screenshots or VNC servers.
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*/
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virtual bool isSecure() const { return false; }
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/**
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* isProtected - true if the layer may contain protected content in the
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* GRALLOC_USAGE_PROTECTED sense.
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*/
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virtual bool isProtected() const { return false; }
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/*
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* isVisible - true if this layer is visibile, false otherwise
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*/
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virtual bool isVisible() const;
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/** called with the state lock when the surface is removed from the
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* current list */
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virtual void onRemoved() { }
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/** called after page-flip
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*/
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virtual void onLayerDisplayed(const sp<const DisplayDevice>& hw,
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HWComposer::HWCLayerInterface* layer);
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/** called before composition.
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* returns true if the layer has pending updates.
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*/
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virtual bool onPreComposition() { return false; }
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/** called before composition.
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*/
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virtual void onPostComposition() { }
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/**
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* Updates the GLConsumer's transform hint, for layers that have
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* a GLConsumer.
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*/
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virtual void updateTransformHint(const sp<const DisplayDevice>& hw) const { }
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/** always call base class first */
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virtual void dump(String8& result, char* scratch, size_t size) const;
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virtual void shortDump(String8& result, char* scratch, size_t size) const;
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virtual void dumpStats(String8& result, char* buffer, size_t SIZE) const;
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virtual void clearStats();
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enum { // flags for doTransaction()
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eDontUpdateGeometryState = 0x00000001,
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eVisibleRegion = 0x00000002,
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};
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inline const State& drawingState() const { return mDrawingState; }
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inline const State& currentState() const { return mCurrentState; }
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inline State& currentState() { return mCurrentState; }
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void clearWithOpenGL(const sp<const DisplayDevice>& hw, const Region& clip) const;
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void setFiltering(bool filtering);
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bool getFiltering() const;
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protected:
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void clearWithOpenGL(const sp<const DisplayDevice>& hw, const Region& clip,
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GLclampf r, GLclampf g, GLclampf b, GLclampf alpha) const;
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void drawWithOpenGL(const sp<const DisplayDevice>& hw, const Region& clip) const;
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sp<SurfaceFlinger> mFlinger;
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private:
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// accessed only in the main thread
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// Whether filtering is forced on or not
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bool mFiltering;
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// Whether filtering is needed b/c of the drawingstate
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bool mNeedsFiltering;
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protected:
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// these are protected by an external lock
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State mCurrentState;
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State mDrawingState;
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volatile int32_t mTransactionFlags;
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// don't change, don't need a lock
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bool mPremultipliedAlpha;
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String8 mName;
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mutable bool mDebug;
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public:
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// called from class SurfaceFlinger
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virtual ~LayerBase();
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private:
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LayerBase(const LayerBase& rhs);
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};
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// ---------------------------------------------------------------------------
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/*
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* This adds some additional fields and methods to support some Binder IPC
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* interactions. In particular, the LayerBaseClient's lifetime can be
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* managed by references to an ISurface object in another process.
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*/
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class LayerBaseClient : public LayerBase
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{
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public:
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LayerBaseClient(SurfaceFlinger* flinger, const sp<Client>& client);
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virtual ~LayerBaseClient();
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// Creates an ISurface associated with this object. This may only be
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// called once (see also getSurfaceBinder()).
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sp<ISurface> getSurface();
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// Returns the Binder object for the ISurface associated with
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// this object.
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wp<IBinder> getSurfaceBinder() const;
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virtual wp<IBinder> getSurfaceTextureBinder() const;
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virtual sp<LayerBaseClient> getLayerBaseClient() const {
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return const_cast<LayerBaseClient*>(this); }
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virtual const char* getTypeId() const { return "LayerBaseClient"; }
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protected:
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virtual void dump(String8& result, char* scratch, size_t size) const;
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virtual void shortDump(String8& result, char* scratch, size_t size) const;
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/*
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* Trivial class, used to ensure that mFlinger->onLayerDestroyed(mLayer)
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* is called.
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*/
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class LayerCleaner {
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sp<SurfaceFlinger> mFlinger;
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wp<LayerBaseClient> mLayer;
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protected:
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~LayerCleaner();
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public:
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LayerCleaner(const sp<SurfaceFlinger>& flinger,
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const sp<LayerBaseClient>& layer);
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};
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private:
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virtual sp<ISurface> createSurface();
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mutable Mutex mLock;
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// Set to true if an ISurface has been associated with this object.
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mutable bool mHasSurface;
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// The ISurface's Binder object, set by getSurface().
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wp<IBinder> mClientSurfaceBinder;
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const wp<Client> mClientRef;
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};
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// ---------------------------------------------------------------------------
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}; // namespace android
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#endif // ANDROID_LAYER_BASE_H
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