125 lines
4.0 KiB
C++
125 lines
4.0 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().setRect(mInitialBounds);
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mTransformStack.emplace_back();
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mCurrentClipIndex = 0;
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mCurrentTransformIndex = 0;
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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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// We need to push before accessing transform() to ensure the reference doesn't move
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// across vector resizes
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mTransformStack.emplace_back() = transform();
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mCurrentTransformIndex += 1;
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}
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if (saveEntry.clip) {
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// We need to push before accessing clip() to ensure the reference doesn't move
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// across vector resizes
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mClipStack.emplace_back() = clip();
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mCurrentClipIndex += 1;
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return true;
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}
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return false;
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}
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// Assert that the cast from SkClipOp to SkRegion::Op is valid
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static_assert(static_cast<int>(SkClipOp::kDifference) == SkRegion::Op::kDifference_Op);
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static_assert(static_cast<int>(SkClipOp::kIntersect) == SkRegion::Op::kIntersect_Op);
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static_assert(static_cast<int>(SkClipOp::kUnion_deprecated) == SkRegion::Op::kUnion_Op);
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static_assert(static_cast<int>(SkClipOp::kXOR_deprecated) == SkRegion::Op::kXOR_Op);
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static_assert(static_cast<int>(SkClipOp::kReverseDifference_deprecated) == SkRegion::Op::kReverseDifference_Op);
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static_assert(static_cast<int>(SkClipOp::kReplace_deprecated) == SkRegion::Op::kReplace_Op);
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void CanvasStateHelper::internalClipRect(const SkRect& rect, SkClipOp op) {
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clip().opRect(rect, transform(), mInitialBounds, (SkRegion::Op)op, false);
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}
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void CanvasStateHelper::internalClipPath(const SkPath& path, SkClipOp op) {
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clip().opPath(path, transform(), mInitialBounds, (SkRegion::Op)op, true);
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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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mTransformStack.pop_back();
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mCurrentTransformIndex -= 1;
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}
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if (entry.clip) {
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// We need to push before accessing clip() to ensure the reference doesn't move
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// across vector resizes
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mClipStack.pop_back();
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mCurrentClipIndex -= 1;
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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 ibounds = clip().getBounds();
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if (ibounds.isEmpty()) {
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return SkRect::MakeEmpty();
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}
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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 (!transform().invert(&inverse)) {
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return SkRect::MakeEmpty();
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}
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SkRect ret = SkRect::MakeEmpty();
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inverse.mapRect(&ret, SkRect::Make(ibounds));
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return ret;
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}
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bool CanvasStateHelper::quickRejectRect(float left, float top, float right, float bottom) const {
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// TODO: Implement
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return false;
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}
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bool CanvasStateHelper::quickRejectPath(const SkPath& path) const {
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// TODO: Implement
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return false;
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}
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} // namespace android::uirenderer
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