Snapshot.cpp revision a8557d2169e14997637f57bc897640c8882d4a46 
1/*
2 * Copyright (C) 2012 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 "Snapshot.h"
18
19#include <SkCanvas.h>
20
21namespace android {
22namespace uirenderer {
23
24///////////////////////////////////////////////////////////////////////////////
25// Constructors
26///////////////////////////////////////////////////////////////////////////////
27
28Snapshot::Snapshot(): flags(0), previous(NULL), layer(NULL), fbo(0),
29        invisible(false), empty(false), alpha(1.0f) {
30
31    transform = &mTransformRoot;
32    clipRect = &mClipRectRoot;
33    region = NULL;
34    clipRegion = NULL;
35}
36
37/**
38 * Copies the specified snapshot/ The specified snapshot is stored as
39 * the previous snapshot.
40 */
41Snapshot::Snapshot(const sp<Snapshot>& s, int saveFlags):
42        flags(0), previous(s), layer(NULL), fbo(s->fbo),
43        invisible(s->invisible), empty(false),
44        viewport(s->viewport), height(s->height), alpha(s->alpha) {
45
46    clipRegion = NULL;
47
48    if (saveFlags & SkCanvas::kMatrix_SaveFlag) {
49        mTransformRoot.load(*s->transform);
50        transform = &mTransformRoot;
51    } else {
52        transform = s->transform;
53    }
54
55    if (saveFlags & SkCanvas::kClip_SaveFlag) {
56        mClipRectRoot.set(*s->clipRect);
57        clipRect = &mClipRectRoot;
58#if STENCIL_BUFFER_SIZE
59        if (s->clipRegion) {
60            mClipRegionRoot.merge(*s->clipRegion);
61            clipRegion = &mClipRegionRoot;
62        }
63#endif
64    } else {
65        clipRect = s->clipRect;
66#if STENCIL_BUFFER_SIZE
67        clipRegion = s->clipRegion;
68#endif
69    }
70
71    if (s->flags & Snapshot::kFlagFboTarget) {
72        flags |= Snapshot::kFlagFboTarget;
73        region = s->region;
74    } else {
75        region = NULL;
76    }
77}
78
79///////////////////////////////////////////////////////////////////////////////
80// Clipping
81///////////////////////////////////////////////////////////////////////////////
82
83void Snapshot::ensureClipRegion() {
84#if STENCIL_BUFFER_SIZE
85    if (!clipRegion) {
86        clipRegion = &mClipRegionRoot;
87        android::Rect tmp(clipRect->left, clipRect->top, clipRect->right, clipRect->bottom);
88        clipRegion->set(tmp);
89    }
90#endif
91}
92
93void Snapshot::copyClipRectFromRegion() {
94#if STENCIL_BUFFER_SIZE
95    if (!clipRegion->isEmpty()) {
96        android::Rect bounds(clipRegion->bounds());
97        clipRect->set(bounds.left, bounds.top, bounds.right, bounds.bottom);
98
99        if (clipRegion->isRect()) {
100            clipRegion->clear();
101            clipRegion = NULL;
102        }
103    } else {
104        clipRect->setEmpty();
105        clipRegion = NULL;
106    }
107#endif
108}
109
110bool Snapshot::clipRegionOr(float left, float top, float right, float bottom) {
111#if STENCIL_BUFFER_SIZE
112    android::Rect tmp(left, top, right, bottom);
113    clipRegion->orSelf(tmp);
114    copyClipRectFromRegion();
115    return true;
116#else
117    return false;
118#endif
119}
120
121bool Snapshot::clipRegionXor(float left, float top, float right, float bottom) {
122#if STENCIL_BUFFER_SIZE
123    android::Rect tmp(left, top, right, bottom);
124    clipRegion->xorSelf(tmp);
125    copyClipRectFromRegion();
126    return true;
127#else
128    return false;
129#endif
130}
131
132bool Snapshot::clipRegionAnd(float left, float top, float right, float bottom) {
133#if STENCIL_BUFFER_SIZE
134    android::Rect tmp(left, top, right, bottom);
135    clipRegion->andSelf(tmp);
136    copyClipRectFromRegion();
137    return true;
138#else
139    return false;
140#endif
141}
142
143bool Snapshot::clipRegionNand(float left, float top, float right, float bottom) {
144#if STENCIL_BUFFER_SIZE
145    android::Rect tmp(left, top, right, bottom);
146    clipRegion->subtractSelf(tmp);
147    copyClipRectFromRegion();
148    return true;
149#else
150    return false;
151#endif
152}
153
154bool Snapshot::clip(float left, float top, float right, float bottom, SkRegion::Op op) {
155    Rect r(left, top, right, bottom);
156    transform->mapRect(r);
157    return clipTransformed(r, op);
158}
159
160bool Snapshot::clipTransformed(const Rect& r, SkRegion::Op op) {
161    bool clipped = false;
162
163    switch (op) {
164        case SkRegion::kDifference_Op: {
165            ensureClipRegion();
166            clipped = clipRegionNand(r.left, r.top, r.right, r.bottom);
167            break;
168        }
169        case SkRegion::kIntersect_Op: {
170            if (CC_UNLIKELY(clipRegion)) {
171                clipped = clipRegionOr(r.left, r.top, r.right, r.bottom);
172            } else {
173                clipped = clipRect->intersect(r);
174                if (!clipped) {
175                    clipRect->setEmpty();
176                    clipped = true;
177                }
178            }
179            break;
180        }
181        case SkRegion::kUnion_Op: {
182            if (CC_UNLIKELY(clipRegion)) {
183                clipped = clipRegionAnd(r.left, r.top, r.right, r.bottom);
184            } else {
185                clipped = clipRect->unionWith(r);
186            }
187            break;
188        }
189        case SkRegion::kXOR_Op: {
190            ensureClipRegion();
191            clipped = clipRegionXor(r.left, r.top, r.right, r.bottom);
192            break;
193        }
194        case SkRegion::kReverseDifference_Op: {
195            // TODO!!!!!!!
196            break;
197        }
198        case SkRegion::kReplace_Op: {
199            setClip(r.left, r.top, r.right, r.bottom);
200            clipped = true;
201            break;
202        }
203    }
204
205    if (clipped) {
206        flags |= Snapshot::kFlagClipSet;
207    }
208
209    return clipped;
210}
211
212void Snapshot::setClip(float left, float top, float right, float bottom) {
213    clipRect->set(left, top, right, bottom);
214#if STENCIL_BUFFER_SIZE
215    if (clipRegion) {
216        clipRegion->clear();
217        clipRegion = NULL;
218    }
219#endif
220    flags |= Snapshot::kFlagClipSet;
221}
222
223const Rect& Snapshot::getLocalClip() {
224    mat4 inverse;
225    inverse.loadInverse(*transform);
226
227    mLocalClip.set(*clipRect);
228    inverse.mapRect(mLocalClip);
229
230    return mLocalClip;
231}
232
233void Snapshot::resetClip(float left, float top, float right, float bottom) {
234    clipRect = &mClipRectRoot;
235    setClip(left, top, right, bottom);
236}
237
238///////////////////////////////////////////////////////////////////////////////
239// Transforms
240///////////////////////////////////////////////////////////////////////////////
241
242void Snapshot::resetTransform(float x, float y, float z) {
243    transform = &mTransformRoot;
244    transform->loadTranslate(x, y, z);
245}
246
247///////////////////////////////////////////////////////////////////////////////
248// Queries
249///////////////////////////////////////////////////////////////////////////////
250
251bool Snapshot::isIgnored() const {
252    return invisible || empty;
253}
254
255}; // namespace uirenderer
256}; // namespace android
257