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/*
* Copyright (C) 2020 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.
*/
#pragma once
// TODO: Can we get the dependencies scoped down more?
#include "CanvasOps.h"
#include "CanvasOpBuffer.h"
#include <SaveFlags.h>
#include <SkRasterClip.h>
#include <ui/FatVector.h>
#include <optional>
namespace android::uirenderer {
// Exists to avoid forcing all this common logic into the templated class
class CanvasStateHelper {
protected:
CanvasStateHelper(int width, int height);
~CanvasStateHelper() = default;
struct SaveEntry {
bool clip : 1 = false;
bool matrix : 1 = false;
bool layer : 1 = false;
};
constexpr SaveEntry saveEntryForLayer() {
return {
.clip = true,
.matrix = true,
.layer = true,
};
}
constexpr SaveEntry flagsToSaveEntry(SaveFlags::Flags flags) {
return SaveEntry {
.clip = static_cast<bool>(flags & SaveFlags::Clip),
.matrix = static_cast<bool>(flags & SaveFlags::Matrix),
.layer = false
};
}
bool internalSave(SaveEntry saveEntry);
void internalSaveLayer(const SkCanvas::SaveLayerRec& layerRec) {
internalSave({
.clip = true,
.matrix = true,
.layer = true
});
internalClipRect(*layerRec.fBounds, SkClipOp::kIntersect);
}
bool internalRestore();
void internalClipRect(const SkRect& rect, SkClipOp op);
void internalClipPath(const SkPath& path, SkClipOp op);
SkIRect mInitialBounds;
FatVector<SaveEntry, 6> mSaveStack;
FatVector<SkMatrix, 6> mTransformStack;
FatVector<SkConservativeClip, 6> mClipStack;
size_t mCurrentTransformIndex;
size_t mCurrentClipIndex;
const SkConservativeClip& clip() const {
return mClipStack[mCurrentClipIndex];
}
SkConservativeClip& clip() {
return mClipStack[mCurrentClipIndex];
}
void resetState(int width, int height);
public:
int saveCount() const { return mSaveStack.size(); }
SkRect getClipBounds() const;
bool quickRejectRect(float left, float top, float right, float bottom) const;
bool quickRejectPath(const SkPath& path) const;
const SkMatrix& transform() const {
return mTransformStack[mCurrentTransformIndex];
}
SkMatrix& transform() {
return mTransformStack[mCurrentTransformIndex];
}
// For compat with existing HWUI Canvas interface
void getMatrix(SkMatrix* outMatrix) const {
*outMatrix = transform();
}
void setMatrix(const SkMatrix& matrix) {
transform() = matrix;
}
void concat(const SkMatrix& matrix) {
transform().preConcat(matrix);
}
void rotate(float degrees) {
SkMatrix m;
m.setRotate(degrees);
concat(m);
}
void scale(float sx, float sy) {
SkMatrix m;
m.setScale(sx, sy);
concat(m);
}
void skew(float sx, float sy) {
SkMatrix m;
m.setSkew(sx, sy);
concat(m);
}
void translate(float dx, float dy) {
transform().preTranslate(dx, dy);
}
};
// Front-end canvas that handles queries, up-front state, and produces CanvasOp<> output downstream
template <typename CanvasOpReceiver>
class CanvasFrontend final : public CanvasStateHelper {
public:
template<class... Args>
CanvasFrontend(int width, int height, Args&&... args) : CanvasStateHelper(width, height),
mReceiver(std::in_place, std::forward<Args>(args)...) { }
void save(SaveFlags::Flags flags = SaveFlags::MatrixClip) {
if (internalSave(flagsToSaveEntry(flags))) {
submit<CanvasOpType::Save>({});
}
}
void restore() {
if (internalRestore()) {
submit<CanvasOpType::Restore>({});
}
}
template <CanvasOpType T>
void draw(CanvasOp<T>&& op) {
// The front-end requires going through certain front-doors, which these aren't.
static_assert(T != CanvasOpType::Save, "Must use CanvasFrontend::save() call instead");
static_assert(T != CanvasOpType::Restore, "Must use CanvasFrontend::restore() call instead");
if constexpr (T == CanvasOpType::SaveLayer) {
internalSaveLayer(op.saveLayerRec);
}
if constexpr (T == CanvasOpType::SaveBehind) {
// Don't use internalSaveLayer as this doesn't apply clipping, it's a "regular" save
// But we do want to flag it as a layer, such that restore is Definitely Required
internalSave(saveEntryForLayer());
}
if constexpr (T == CanvasOpType::ClipRect) {
internalClipRect(op.rect, op.op);
}
if constexpr (T == CanvasOpType::ClipPath) {
internalClipPath(op.path, op.op);
}
submit(std::move(op));
}
const CanvasOpReceiver& receiver() const {
LOG_ALWAYS_FATAL_IF(!mReceiver.has_value());
return *mReceiver;
}
CanvasOpReceiver finish() {
auto ret = std::move(mReceiver.value());
mReceiver.reset();
return std::move(ret);
}
template<class... Args>
void reset(int newWidth, int newHeight, Args&&... args) {
resetState(newWidth, newHeight);
mReceiver.emplace(std::forward<Args>(args)...);
}
private:
std::optional<CanvasOpReceiver> mReceiver;
template <CanvasOpType T>
void submit(CanvasOp<T>&& op) {
LOG_ALWAYS_FATAL_IF(!mReceiver.has_value());
mReceiver->push_container(CanvasOpContainer(std::move(op), transform()));
}
};
} // namespace android::uirenderer
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