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/*
* Copyright (C) 2015 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 ANDROID_HWUI_BAKED_OP_STATE_H
#define ANDROID_HWUI_BAKED_OP_STATE_H
#include "Matrix.h"
#include "RecordedOp.h"
#include "Rect.h"
#include "Snapshot.h"
namespace android {
namespace uirenderer {
namespace OpClipSideFlags {
enum {
None = 0x0,
Left = 0x1,
Top = 0x2,
Right = 0x4,
Bottom = 0x8,
Full = 0xF,
// ConservativeFull = 0x1F needed?
};
}
/**
* Holds a list of BakedOpStates of ops that can be drawn together
*/
struct MergedBakedOpList {
const BakedOpState*const* states;
size_t count;
int clipSideFlags;
Rect clip;
};
/**
* Holds the resolved clip, transform, and bounds of a recordedOp, when replayed with a snapshot
*/
class ResolvedRenderState {
public:
// TODO: remove the mapRects/matrix multiply when snapshot & recorded transforms are translates
ResolvedRenderState(const Snapshot& snapshot, const RecordedOp& recordedOp, bool expandForStroke) {
/* TODO: benchmark a fast path for translate-only matrices, such as:
if (CC_LIKELY(snapshot.transform->getType() == Matrix4::kTypeTranslate
&& recordedOp.localMatrix.getType() == Matrix4::kTypeTranslate)) {
float translateX = snapshot.transform->getTranslateX() + recordedOp.localMatrix.getTranslateX();
float translateY = snapshot.transform->getTranslateY() + recordedOp.localMatrix.getTranslateY();
transform.loadTranslate(translateX, translateY, 0);
// resolvedClipRect = intersect(parentMatrix * localClip, parentClip)
clipRect = recordedOp.localClipRect;
clipRect.translate(translateX, translateY);
clipRect.doIntersect(snapshot.getClipRect());
clipRect.snapToPixelBoundaries();
// resolvedClippedBounds = intersect(resolvedMatrix * opBounds, resolvedClipRect)
clippedBounds = recordedOp.unmappedBounds;
clippedBounds.translate(translateX, translateY);
} ... */
// resolvedMatrix = parentMatrix * localMatrix
transform.loadMultiply(*snapshot.transform, recordedOp.localMatrix);
// resolvedClipRect = intersect(parentMatrix * localClip, parentClip)
clipRect = recordedOp.localClipRect;
snapshot.transform->mapRect(clipRect);
clipRect.doIntersect(snapshot.getRenderTargetClip());
clipRect.snapToPixelBoundaries();
// resolvedClippedBounds = intersect(resolvedMatrix * opBounds, resolvedClipRect)
clippedBounds = recordedOp.unmappedBounds;
if (CC_UNLIKELY(expandForStroke)) {
// account for non-hairline stroke
clippedBounds.outset(recordedOp.paint->getStrokeWidth() * 0.5f);
}
transform.mapRect(clippedBounds);
if (CC_UNLIKELY(expandForStroke
&& (!transform.isPureTranslate() || recordedOp.paint->getStrokeWidth() < 1.0f))) {
// account for hairline stroke when stroke may be < 1 scaled pixel
// Non translate || strokeWidth < 1 is conservative, but will cover all cases
clippedBounds.outset(0.5f);
}
if (clipRect.left > clippedBounds.left) clipSideFlags |= OpClipSideFlags::Left;
if (clipRect.top > clippedBounds.top) clipSideFlags |= OpClipSideFlags::Top;
if (clipRect.right < clippedBounds.right) clipSideFlags |= OpClipSideFlags::Right;
if (clipRect.bottom < clippedBounds.bottom) clipSideFlags |= OpClipSideFlags::Bottom;
clippedBounds.doIntersect(clipRect);
/**
* TODO: once we support complex clips, we may want to reject to avoid that work where
* possible. Should we:
* 1 - quickreject based on clippedBounds, quick early (duplicating logic in resolvedOp)
* 2 - merge stuff into tryConstruct factory method, so it can handle quickRejection
* and early return null in one place.
*/
}
/**
* Constructor for unbounded ops without transform/clip (namely shadows)
*
* Since the op doesn't have known bounds, we conservatively set the mapped bounds
* to the current clipRect, and clipSideFlags to Full.
*/
ResolvedRenderState(const Snapshot& snapshot) {
transform = *snapshot.transform;
clipRect = snapshot.getRenderTargetClip();
clippedBounds = clipRect;
transform.mapRect(clippedBounds);
clipSideFlags = OpClipSideFlags::Full;
}
Matrix4 transform;
Rect clipRect;
int clipSideFlags = 0;
Rect clippedBounds;
};
/**
* Self-contained op wrapper, containing all resolved state required to draw the op.
*
* Stashed pointers within all point to longer lived objects, with no ownership implied.
*/
class BakedOpState {
public:
static BakedOpState* tryConstruct(LinearAllocator& allocator,
const Snapshot& snapshot, const RecordedOp& recordedOp) {
BakedOpState* bakedState = new (allocator) BakedOpState(snapshot, recordedOp, false);
if (bakedState->computedState.clippedBounds.isEmpty()) {
// bounds are empty, so op is rejected
allocator.rewindIfLastAlloc(bakedState);
return nullptr;
}
return bakedState;
}
enum class StrokeBehavior {
// stroking is forced, regardless of style on paint
Forced,
// stroking is defined by style on paint
StyleDefined,
};
static BakedOpState* tryStrokeableOpConstruct(LinearAllocator& allocator,
const Snapshot& snapshot, const RecordedOp& recordedOp, StrokeBehavior strokeBehavior) {
bool expandForStroke = (strokeBehavior == StrokeBehavior::StyleDefined)
? (recordedOp.paint && recordedOp.paint->getStyle() != SkPaint::kFill_Style)
: true;
BakedOpState* bakedState = new (allocator) BakedOpState(
snapshot, recordedOp, expandForStroke);
if (bakedState->computedState.clippedBounds.isEmpty()) {
// bounds are empty, so op is rejected
allocator.rewindIfLastAlloc(bakedState);
return nullptr;
}
return bakedState;
}
static BakedOpState* tryShadowOpConstruct(LinearAllocator& allocator,
const Snapshot& snapshot, const ShadowOp* shadowOpPtr) {
if (snapshot.getRenderTargetClip().isEmpty()) return nullptr;
// clip isn't empty, so construct the op
return new (allocator) BakedOpState(snapshot, shadowOpPtr);
}
static void* operator new(size_t size, LinearAllocator& allocator) {
return allocator.alloc(size);
}
// computed state:
const ResolvedRenderState computedState;
// simple state (straight pointer/value storage):
const float alpha;
const RoundRectClipState* roundRectClipState;
const ProjectionPathMask* projectionPathMask;
const RecordedOp* op;
private:
BakedOpState(const Snapshot& snapshot, const RecordedOp& recordedOp, bool expandForStroke)
: computedState(snapshot, recordedOp, expandForStroke)
, alpha(snapshot.alpha)
, roundRectClipState(snapshot.roundRectClipState)
, projectionPathMask(snapshot.projectionPathMask)
, op(&recordedOp) {}
BakedOpState(const Snapshot& snapshot, const ShadowOp* shadowOpPtr)
: computedState(snapshot)
, alpha(snapshot.alpha)
, roundRectClipState(snapshot.roundRectClipState)
, projectionPathMask(snapshot.projectionPathMask)
, op(shadowOpPtr) {}
};
}; // namespace uirenderer
}; // namespace android
#endif // ANDROID_HWUI_BAKED_OP_STATE_H
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