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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.
*/
#include "CanvasFrontend.h"
#include "CanvasOps.h"
#include "CanvasOpBuffer.h"
namespace android::uirenderer {
CanvasStateHelper::CanvasStateHelper(int width, int height) {
resetState(width, height);
}
void CanvasStateHelper::resetState(int width, int height) {
mInitialBounds = SkIRect::MakeWH(width, height);
mSaveStack.clear();
mClipStack.clear();
mTransformStack.clear();
mSaveStack.emplace_back();
mClipStack.emplace_back();
mTransformStack.emplace_back();
clip().bounds = mInitialBounds;
}
bool CanvasStateHelper::internalSave(SaveEntry saveEntry) {
mSaveStack.push_back(saveEntry);
if (saveEntry.matrix) {
pushEntry(&mTransformStack);
}
if (saveEntry.clip) {
pushEntry(&mClipStack);
return true;
}
return false;
}
void CanvasStateHelper::ConservativeClip::apply(SkClipOp op, const SkMatrix& matrix,
const SkRect& bounds, bool aa, bool fillsBounds) {
this->aa |= aa;
if (op == SkClipOp::kIntersect) {
SkRect devBounds;
bool rect = matrix.mapRect(&devBounds, bounds) && fillsBounds;
if (!this->bounds.intersect(aa ? devBounds.roundOut() : devBounds.round())) {
this->bounds.setEmpty();
}
this->rect &= rect;
} else {
// Difference operations subtracts a region from the clip, so conservatively
// the bounds remain unchanged and the shape is unlikely to remain a rect.
this->rect = false;
}
}
void CanvasStateHelper::internalClipRect(const SkRect& rect, SkClipOp op) {
clip().apply(op, transform(), rect, /*aa=*/false, /*fillsBounds=*/true);
}
void CanvasStateHelper::internalClipPath(const SkPath& path, SkClipOp op) {
SkRect bounds = path.getBounds();
if (path.isInverseFillType()) {
// Toggle op type if the path is inverse filled
op = (op == SkClipOp::kIntersect ? SkClipOp::kDifference : SkClipOp::kIntersect);
}
clip().apply(op, transform(), bounds, /*aa=*/true, /*fillsBounds=*/false);
}
CanvasStateHelper::ConservativeClip& CanvasStateHelper::clip() {
return writableEntry(&mClipStack);
}
SkMatrix& CanvasStateHelper::transform() {
return writableEntry(&mTransformStack);
}
bool CanvasStateHelper::internalRestore() {
// Prevent underflows
if (saveCount() <= 1) {
return false;
}
SaveEntry entry = mSaveStack[mSaveStack.size() - 1];
mSaveStack.pop_back();
bool needsRestorePropagation = entry.layer;
if (entry.matrix) {
popEntry(&mTransformStack);
}
if (entry.clip) {
popEntry(&mClipStack);
needsRestorePropagation = true;
}
return needsRestorePropagation;
}
SkRect CanvasStateHelper::getClipBounds() const {
SkIRect bounds = clip().bounds;
SkMatrix inverse;
// if we can't invert the CTM, we can't return local clip bounds
if (bounds.isEmpty() || !transform().invert(&inverse)) {
return SkRect::MakeEmpty();
}
return inverse.mapRect(SkRect::Make(bounds));
}
bool CanvasStateHelper::ConservativeClip::quickReject(const SkMatrix& matrix,
const SkRect& bounds) const {
SkRect devRect = matrix.mapRect(bounds);
return devRect.isFinite() &&
SkIRect::Intersects(this->bounds, aa ? devRect.roundOut() : devRect.round());
}
bool CanvasStateHelper::quickRejectRect(float left, float top, float right, float bottom) const {
return clip().quickReject(transform(), SkRect::MakeLTRB(left, top, right, bottom));
}
bool CanvasStateHelper::quickRejectPath(const SkPath& path) const {
if (this->isClipEmpty()) {
// reject everything (prioritized above path inverse fill type).
return true;
} else {
// Don't reject inverse-filled paths, since even if they are "empty" of points/verbs,
// they fill out the entire clip.
return !path.isInverseFillType() && clip().quickReject(transform(), path.getBounds());
}
}
} // namespace android::uirenderer
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