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