1/*
2 * Copyright (C) 2015 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#include "BakedOpState.h"
18
19#include "ClipArea.h"
20
21namespace android {
22namespace uirenderer {
23
24static int computeClipSideFlags(const Rect& clip, const Rect& bounds) {
25    int clipSideFlags = 0;
26    if (clip.left > bounds.left) clipSideFlags |= OpClipSideFlags::Left;
27    if (clip.top > bounds.top) clipSideFlags |= OpClipSideFlags::Top;
28    if (clip.right < bounds.right) clipSideFlags |= OpClipSideFlags::Right;
29    if (clip.bottom < bounds.bottom) clipSideFlags |= OpClipSideFlags::Bottom;
30    return clipSideFlags;
31}
32
33ResolvedRenderState::ResolvedRenderState(LinearAllocator& allocator, Snapshot& snapshot,
34        const RecordedOp& recordedOp, bool expandForStroke, bool expandForPathTexture) {
35    // resolvedMatrix = parentMatrix * localMatrix
36    transform.loadMultiply(*snapshot.transform, recordedOp.localMatrix);
37
38    // resolvedClippedBounds = intersect(resolvedMatrix * opBounds, resolvedClipRect)
39    clippedBounds = recordedOp.unmappedBounds;
40    if (CC_UNLIKELY(expandForStroke)) {
41        // account for non-hairline stroke
42        clippedBounds.outset(recordedOp.paint->getStrokeWidth() * 0.5f);
43    } else if (CC_UNLIKELY(expandForPathTexture)) {
44        clippedBounds.outset(1);
45    }
46    transform.mapRect(clippedBounds);
47    if (CC_UNLIKELY(expandForStroke
48            && (!transform.isPureTranslate() || recordedOp.paint->getStrokeWidth() < 1.0f))) {
49        // account for hairline stroke when stroke may be < 1 scaled pixel
50        // Non translate || strokeWidth < 1 is conservative, but will cover all cases
51        clippedBounds.outset(0.5f);
52    }
53
54    // resolvedClipRect = intersect(parentMatrix * localClip, parentClip)
55    clipState = snapshot.serializeIntersectedClip(allocator,
56            recordedOp.localClip, *(snapshot.transform));
57    LOG_ALWAYS_FATAL_IF(!clipState, "must clip!");
58
59    const Rect& clipRect = clipState->rect;
60    if (CC_UNLIKELY(clipRect.isEmpty() || !clippedBounds.intersects(clipRect))) {
61        // Rejected based on either empty clip, or bounds not intersecting with clip
62
63        // Note: we could rewind the clipState object in situations where the clipRect is empty,
64        // but *only* if the caching logic within ClipArea was aware of the rewind.
65        clipState = nullptr;
66        clippedBounds.setEmpty();
67    } else {
68        // Not rejected! compute true clippedBounds, clipSideFlags, and path mask
69        clipSideFlags = computeClipSideFlags(clipRect, clippedBounds);
70        clippedBounds.doIntersect(clipRect);
71
72        if (CC_UNLIKELY(snapshot.projectionPathMask)) {
73            // map projection path mask from render target space into op space,
74            // so intersection with op geometry is possible
75            Matrix4 inverseTransform;
76            inverseTransform.loadInverse(transform);
77            SkMatrix skInverseTransform;
78            inverseTransform.copyTo(skInverseTransform);
79
80            auto localMask = allocator.create<SkPath>();
81            snapshot.projectionPathMask->transform(skInverseTransform, localMask);
82            localProjectionPathMask = localMask;
83        }
84    }
85}
86
87ResolvedRenderState::ResolvedRenderState(LinearAllocator& allocator, Snapshot& snapshot,
88        const Matrix4& localTransform, const ClipBase* localClip) {
89    transform.loadMultiply(*snapshot.transform, localTransform);
90    clipState = snapshot.serializeIntersectedClip(allocator, localClip, *(snapshot.transform));
91    clippedBounds = clipState->rect;
92    clipSideFlags = OpClipSideFlags::Full;
93    localProjectionPathMask = nullptr;
94}
95
96ResolvedRenderState::ResolvedRenderState(LinearAllocator& allocator, Snapshot& snapshot)
97        : transform(*snapshot.transform)
98        , clipState(snapshot.mutateClipArea().serializeClip(allocator))
99        , clippedBounds(clipState->rect)
100        , clipSideFlags(OpClipSideFlags::Full)
101        , localProjectionPathMask(nullptr) {}
102
103ResolvedRenderState::ResolvedRenderState(const ClipRect* clipRect, const Rect& dstRect)
104        : transform(Matrix4::identity())
105        , clipState(clipRect)
106        , clippedBounds(dstRect)
107        , clipSideFlags(computeClipSideFlags(clipRect->rect, dstRect))
108        , localProjectionPathMask(nullptr) {
109    clippedBounds.doIntersect(clipRect->rect);
110}
111
112BakedOpState* BakedOpState::tryConstruct(LinearAllocator& allocator,
113        Snapshot& snapshot, const RecordedOp& recordedOp) {
114    if (CC_UNLIKELY(snapshot.getRenderTargetClip().isEmpty())) return nullptr;
115    BakedOpState* bakedState = allocator.create_trivial<BakedOpState>(
116            allocator, snapshot, recordedOp, false, false);
117    if (bakedState->computedState.clippedBounds.isEmpty()) {
118        // bounds are empty, so op is rejected
119        allocator.rewindIfLastAlloc(bakedState);
120        return nullptr;
121    }
122    return bakedState;
123}
124
125BakedOpState* BakedOpState::tryConstructUnbounded(LinearAllocator& allocator,
126        Snapshot& snapshot, const RecordedOp& recordedOp) {
127    if (CC_UNLIKELY(snapshot.getRenderTargetClip().isEmpty())) return nullptr;
128    return allocator.create_trivial<BakedOpState>(allocator, snapshot, recordedOp);
129}
130
131BakedOpState* BakedOpState::tryStrokeableOpConstruct(LinearAllocator& allocator,
132        Snapshot& snapshot, const RecordedOp& recordedOp, StrokeBehavior strokeBehavior,
133        bool expandForPathTexture) {
134    if (CC_UNLIKELY(snapshot.getRenderTargetClip().isEmpty())) return nullptr;
135    bool expandForStroke = (strokeBehavior == StrokeBehavior::Forced
136            || (recordedOp.paint && recordedOp.paint->getStyle() != SkPaint::kFill_Style));
137
138    BakedOpState* bakedState = allocator.create_trivial<BakedOpState>(
139           allocator, snapshot, recordedOp, expandForStroke, expandForPathTexture);
140    if (bakedState->computedState.clippedBounds.isEmpty()) {
141        // bounds are empty, so op is rejected
142        // NOTE: this won't succeed if a clip was allocated
143        allocator.rewindIfLastAlloc(bakedState);
144        return nullptr;
145    }
146    return bakedState;
147}
148
149BakedOpState* BakedOpState::tryShadowOpConstruct(LinearAllocator& allocator,
150        Snapshot& snapshot, const ShadowOp* shadowOpPtr) {
151    if (CC_UNLIKELY(snapshot.getRenderTargetClip().isEmpty())) return nullptr;
152
153    // clip isn't empty, so construct the op
154    return allocator.create_trivial<BakedOpState>(allocator, snapshot, shadowOpPtr);
155}
156
157BakedOpState* BakedOpState::directConstruct(LinearAllocator& allocator,
158        const ClipRect* clip, const Rect& dstRect, const RecordedOp& recordedOp) {
159    return allocator.create_trivial<BakedOpState>(clip, dstRect, recordedOp);
160}
161
162void BakedOpState::setupOpacity(const SkPaint* paint) {
163    computedState.opaqueOverClippedBounds = computedState.transform.isSimple()
164            && computedState.clipState->mode == ClipMode::Rectangle
165            && MathUtils::areEqual(alpha, 1.0f)
166            && !roundRectClipState
167            && PaintUtils::isOpaquePaint(paint);
168}
169
170} // namespace uirenderer
171} // namespace android
172