gecko/gfx/layers/ipc/PLayers.ipdl

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* vim: sw=2 ts=8 et :
*/
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
include LayersSurfaces;
include protocol PCompositor;
include protocol PGrallocBuffer;
include protocol PLayer;
include protocol PRenderFrame;
include "gfxipc/ShadowLayerUtils.h";
include "mozilla/WidgetUtils.h";
include "mozilla/TimeStamp.h";
include "nsCSSProperty.h";
using gfxPoint3D;
using nscoord;
using nsRect;
using nsPoint;
using mozilla::TimeDuration;
using mozilla::TimeStamp;
using mozilla::ScreenRotation;
using nsCSSProperty;
/**
* The layers protocol is spoken between thread contexts that manage
* layer (sub)trees. The protocol comprises atomically publishing
* layer subtrees to a "shadow" thread context (which grafts the
* subtree into its own tree), and atomically updating a published
* subtree. ("Atomic" in this sense is wrt painting.)
*/
namespace mozilla {
namespace layers {
struct TargetConfig {
nsIntRect naturalBounds;
ScreenRotation rotation;
};
// Create a shadow layer for |layer|
struct OpCreateThebesLayer { PLayer layer; };
struct OpCreateContainerLayer { PLayer layer; };
struct OpCreateImageLayer { PLayer layer; };
struct OpCreateColorLayer { PLayer layer; };
struct OpCreateCanvasLayer { PLayer layer; };
struct OpCreateRefLayer { PLayer layer; };
struct ThebesBuffer {
SurfaceDescriptor buffer;
nsIntRect rect;
nsIntPoint rotation;
};
union OptionalThebesBuffer { ThebesBuffer; null_t; };
union CanvasSurface {
SurfaceDescriptor;
null_t;
};
struct CubicBezierFunction {
float x1;
float y1;
float x2;
float y2;
};
struct StepFunction {
int steps;
// 1 = nsTimingFunction::StepStart, 2 = nsTimingFunction::StepEnd
int type;
};
union TimingFunction {
CubicBezierFunction;
StepFunction;
};
struct Color { gfxRGBA value; };
struct Perspective { float value; };
struct RotationX { float radians; };
struct RotationY { float radians; };
struct RotationZ { float radians; };
struct Rotation { float radians; };
struct Rotation3D {
float x;
float y;
float z;
float radians;
};
struct Scale {
float x;
float y;
float z;
};
struct SkewX { float x; };
struct SkewY { float y; };
struct TransformMatrix { gfx3DMatrix value; };
struct Translation {
float x;
float y;
float z;
};
union TransformFunction {
Perspective;
RotationX;
RotationY;
RotationZ;
Rotation;
Rotation3D;
Scale;
SkewX;
SkewY;
Translation;
TransformMatrix;
};
union Animatable {
float;
TransformFunction[];
};
struct AnimationSegment {
Animatable startState;
Animatable endState;
float startPortion;
float endPortion;
TimingFunction sampleFn;
};
// Transforms need extra information to correctly convert the list of transform
// functions to a gfx3DMatrix that can be applied directly to the layer.
struct TransformData {
nsPoint origin;
gfxPoint3D mozOrigin;
gfxPoint3D perspectiveOrigin;
nsRect bounds;
nscoord perspective;
};
union AnimationData {
null_t;
TransformData;
};
struct Animation {
TimeStamp startTime;
TimeDuration duration;
// For each frame, the interpolation point is computed based on the
// startTime, the direction, the duration, and the current time.
// The segments must uniquely cover the portion from 0.0 to 1.0
AnimationSegment[] segments;
// How many times to repeat the animation. < 0 means "forever".
float numIterations;
// This uses the NS_STYLE_ANIMATION_DIRECTION_* constants.
int32_t direction;
nsCSSProperty property;
AnimationData data;
};
// Change a layer's attributes
struct CommonLayerAttributes {
nsIntRegion visibleRegion;
TransformMatrix transform;
float postXScale;
float postYScale;
uint32_t contentFlags;
float opacity;
bool useClipRect;
nsIntRect clipRect;
bool isFixedPosition;
gfxPoint fixedPositionAnchor;
nullable PLayer maskLayer;
// Animated colors will only honored for ColorLayers.
Animation[] animations;
};
struct ThebesLayerAttributes {
nsIntRegion validRegion;
};
struct ContainerLayerAttributes {
FrameMetrics metrics;
float preXScale;
float preYScale;
};
struct ColorLayerAttributes { Color color; };
struct CanvasLayerAttributes { GraphicsFilterType filter; };
struct RefLayerAttributes { int64_t id; };
struct ImageLayerAttributes {
GraphicsFilterType filter;
bool forceSingleTile;
};
union SpecificLayerAttributes {
null_t;
ThebesLayerAttributes;
ContainerLayerAttributes;
ColorLayerAttributes;
CanvasLayerAttributes;
RefLayerAttributes;
ImageLayerAttributes;
};
struct LayerAttributes {
CommonLayerAttributes common;
SpecificLayerAttributes specific;
};
struct OpSetLayerAttributes {
PLayer layer;
LayerAttributes attrs;
};
// Monkey with the tree structure
struct OpSetRoot { PLayer root; };
struct OpInsertAfter { PLayer container; PLayer childLayer; PLayer after; };
struct OpAppendChild { PLayer container; PLayer childLayer; };
struct OpRemoveChild { PLayer container; PLayer childLayer; };
struct OpRepositionChild { PLayer container; PLayer childLayer; PLayer after; };
struct OpRaiseToTopChild { PLayer container; PLayer childLayer; };
// Paint (buffer update)
struct OpPaintThebesBuffer {
PLayer layer;
ThebesBuffer newFrontBuffer;
nsIntRegion updatedRegion;
};
struct OpPaintTiledLayerBuffer {
PLayer layer;
// Bug 747811
// FIXME: We need to support sharing tile across process.
uintptr_t tiledLayerBuffer;
};
struct OpPaintCanvas {
PLayer layer;
CanvasSurface newFrontBuffer;
bool needYFlip;
};
struct OpPaintImage {
PLayer layer;
SharedImage newFrontBuffer;
};
// A unit of a changeset; a set of these comprise a changeset
union Edit {
OpCreateThebesLayer;
OpCreateContainerLayer;
OpCreateImageLayer;
OpCreateColorLayer;
OpCreateCanvasLayer;
OpCreateRefLayer;
OpSetLayerAttributes;
OpSetRoot;
OpInsertAfter;
OpAppendChild;
OpRemoveChild;
OpRepositionChild;
OpRaiseToTopChild;
OpPaintThebesBuffer;
OpPaintTiledLayerBuffer;
OpPaintCanvas;
OpPaintImage;
};
// Replies to operations
struct OpBufferSwap { PLayer layer; CanvasSurface newBackBuffer; };
struct OpImageSwap { PLayer layer; SharedImage newBackImage; };
struct OpThebesBufferSwap {
PLayer layer;
OptionalThebesBuffer newBackBuffer;
nsIntRegion newValidRegion;
// If the parent took the child's old back buffer and returned its
// old front buffer, |readOnlyFrontBuffer| may (if non-null) contain
// the child's old back buffer (parent's new front buffer). This
// buffer can be used to read back the newly updated region into the
// child's new back buffer. This buffer must be considered
// read-only, but sadly that's not enforced.
OptionalThebesBuffer readOnlyFrontBuffer;
nsIntRegion frontUpdatedRegion;
};
// Unit of a "changeset reply". This is a weird abstraction, probably
// only to be used for buffer swapping.
union EditReply {
OpBufferSwap;
OpThebesBufferSwap;
OpImageSwap;
};
sync protocol PLayers {
manager PRenderFrame or PCompositor;
manages PGrallocBuffer;
manages PLayer;
parent:
/**
* Only the parent side has privileges to allocate the buffer.
* Allocation may fail (pmem is a scarce resource), and if so null_t
* is returned.
*/
sync PGrallocBuffer(gfxIntSize size, gfxContentType content)
returns (MaybeMagicGrallocBufferHandle handle);
async PLayer();
// The isFirstPaint flag can be used to indicate that this is the first update
// for a particular document.
sync Update(Edit[] cset, TargetConfig targetConfig, bool isFirstPaint)
returns (EditReply[] reply);
// We don't need to send a sync transaction if
// no transaction operate require a swap.
async UpdateNoSwap(Edit[] cset, TargetConfig targetConfig, bool isFirstPaint);
async __delete__();
};
} // namespace layers
} // namespace mozilla