144 lines
4.6 KiB
C++
144 lines
4.6 KiB
C++
/*
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* Copyright (C) 2020 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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#include "CanvasFrontend.h"
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#include "CanvasOps.h"
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#include "CanvasOpBuffer.h"
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namespace android::uirenderer {
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CanvasStateHelper::CanvasStateHelper(int width, int height) {
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resetState(width, height);
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}
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void CanvasStateHelper::resetState(int width, int height) {
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mInitialBounds = SkIRect::MakeWH(width, height);
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mSaveStack.clear();
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mClipStack.clear();
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mTransformStack.clear();
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mSaveStack.emplace_back();
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mClipStack.emplace_back();
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mTransformStack.emplace_back();
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clip().bounds = mInitialBounds;
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}
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bool CanvasStateHelper::internalSave(SaveEntry saveEntry) {
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mSaveStack.push_back(saveEntry);
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if (saveEntry.matrix) {
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pushEntry(&mTransformStack);
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}
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if (saveEntry.clip) {
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pushEntry(&mClipStack);
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return true;
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}
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return false;
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}
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void CanvasStateHelper::ConservativeClip::apply(SkClipOp op, const SkMatrix& matrix,
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const SkRect& bounds, bool aa, bool fillsBounds) {
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this->aa |= aa;
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if (op == SkClipOp::kIntersect) {
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SkRect devBounds;
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bool rect = matrix.mapRect(&devBounds, bounds) && fillsBounds;
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if (!this->bounds.intersect(aa ? devBounds.roundOut() : devBounds.round())) {
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this->bounds.setEmpty();
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}
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this->rect &= rect;
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} else {
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// Difference operations subtracts a region from the clip, so conservatively
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// the bounds remain unchanged and the shape is unlikely to remain a rect.
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this->rect = false;
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}
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}
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void CanvasStateHelper::internalClipRect(const SkRect& rect, SkClipOp op) {
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clip().apply(op, transform(), rect, /*aa=*/false, /*fillsBounds=*/true);
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}
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void CanvasStateHelper::internalClipPath(const SkPath& path, SkClipOp op) {
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SkRect bounds = path.getBounds();
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if (path.isInverseFillType()) {
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// Toggle op type if the path is inverse filled
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op = (op == SkClipOp::kIntersect ? SkClipOp::kDifference : SkClipOp::kIntersect);
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}
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clip().apply(op, transform(), bounds, /*aa=*/true, /*fillsBounds=*/false);
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}
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CanvasStateHelper::ConservativeClip& CanvasStateHelper::clip() {
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return writableEntry(&mClipStack);
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}
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SkMatrix& CanvasStateHelper::transform() {
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return writableEntry(&mTransformStack);
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}
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bool CanvasStateHelper::internalRestore() {
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// Prevent underflows
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if (saveCount() <= 1) {
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return false;
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}
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SaveEntry entry = mSaveStack[mSaveStack.size() - 1];
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mSaveStack.pop_back();
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bool needsRestorePropagation = entry.layer;
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if (entry.matrix) {
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popEntry(&mTransformStack);
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}
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if (entry.clip) {
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popEntry(&mClipStack);
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needsRestorePropagation = true;
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}
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return needsRestorePropagation;
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}
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SkRect CanvasStateHelper::getClipBounds() const {
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SkIRect bounds = clip().bounds;
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SkMatrix inverse;
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// if we can't invert the CTM, we can't return local clip bounds
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if (bounds.isEmpty() || !transform().invert(&inverse)) {
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return SkRect::MakeEmpty();
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}
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return inverse.mapRect(SkRect::Make(bounds));
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}
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bool CanvasStateHelper::ConservativeClip::quickReject(const SkMatrix& matrix,
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const SkRect& bounds) const {
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SkRect devRect = matrix.mapRect(bounds);
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return devRect.isFinite() &&
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SkIRect::Intersects(this->bounds, aa ? devRect.roundOut() : devRect.round());
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}
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bool CanvasStateHelper::quickRejectRect(float left, float top, float right, float bottom) const {
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return clip().quickReject(transform(), SkRect::MakeLTRB(left, top, right, bottom));
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}
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bool CanvasStateHelper::quickRejectPath(const SkPath& path) const {
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if (this->isClipEmpty()) {
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// reject everything (prioritized above path inverse fill type).
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return true;
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} else {
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// Don't reject inverse-filled paths, since even if they are "empty" of points/verbs,
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// they fill out the entire clip.
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return !path.isInverseFillType() && clip().quickReject(transform(), path.getBounds());
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}
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}
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} // namespace android::uirenderer
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