StatefulBaseRenderer.cpp revision 797b95b26bbb7557678af78b9a2a61830158920f 
1/*
2 * Copyright (C) 2014 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#define LOG_TAG "OpenGLRenderer"
18
19#include <SkCanvas.h>
20
21#include "StatefulBaseRenderer.h"
22
23namespace android {
24namespace uirenderer {
25
26StatefulBaseRenderer::StatefulBaseRenderer() :
27        mDirtyClip(false), mWidth(-1), mHeight(-1),
28        mSaveCount(1), mFirstSnapshot(new Snapshot), mSnapshot(mFirstSnapshot),
29        mLightCenter(FLT_MIN, FLT_MIN, FLT_MIN), mLightRadius(FLT_MIN) {
30}
31
32void StatefulBaseRenderer::initializeSaveStack(float clipLeft, float clipTop,
33        float clipRight, float clipBottom) {
34    mSnapshot = new Snapshot(mFirstSnapshot,
35            SkCanvas::kMatrix_SaveFlag | SkCanvas::kClip_SaveFlag);
36    mSnapshot->setClip(clipLeft, clipTop, clipRight, clipBottom);
37    mSnapshot->fbo = getTargetFbo();
38    mSaveCount = 1;
39}
40
41void StatefulBaseRenderer::setViewport(int width, int height) {
42    mWidth = width;
43    mHeight = height;
44    mFirstSnapshot->initializeViewport(width, height);
45    onViewportInitialized();
46}
47
48void StatefulBaseRenderer::initializeLight(const Vector3& lightCenter, float lightRadius) {
49    mLightCenter = lightCenter;
50    mLightRadius = lightRadius;
51}
52
53///////////////////////////////////////////////////////////////////////////////
54// Save (layer)
55///////////////////////////////////////////////////////////////////////////////
56
57/**
58 * Non-virtual implementation of save, guaranteed to save without side-effects
59 *
60 * The approach here and in restoreSnapshot(), allows subclasses to directly manipulate the save
61 * stack, and ensures restoreToCount() doesn't call back into subclass overrides.
62 */
63int StatefulBaseRenderer::saveSnapshot(int flags) {
64    mSnapshot = new Snapshot(mSnapshot, flags);
65    return mSaveCount++;
66}
67
68int StatefulBaseRenderer::save(int flags) {
69    return saveSnapshot(flags);
70}
71
72/**
73 * Non-virtual implementation of restore, guaranteed to restore without side-effects.
74 */
75void StatefulBaseRenderer::restoreSnapshot() {
76    sp<Snapshot> toRemove = mSnapshot;
77    sp<Snapshot> toRestore = mSnapshot->previous;
78
79    mSaveCount--;
80    mSnapshot = toRestore;
81
82    // subclass handles restore implementation
83    onSnapshotRestored(*toRemove, *toRestore);
84}
85
86void StatefulBaseRenderer::restore() {
87    if (mSaveCount > 1) {
88        restoreSnapshot();
89    }
90}
91
92void StatefulBaseRenderer::restoreToCount(int saveCount) {
93    if (saveCount < 1) saveCount = 1;
94
95    while (mSaveCount > saveCount) {
96        restoreSnapshot();
97    }
98}
99
100///////////////////////////////////////////////////////////////////////////////
101// Matrix
102///////////////////////////////////////////////////////////////////////////////
103
104void StatefulBaseRenderer::getMatrix(SkMatrix* matrix) const {
105    mSnapshot->transform->copyTo(*matrix);
106}
107
108void StatefulBaseRenderer::translate(float dx, float dy, float dz) {
109    mSnapshot->transform->translate(dx, dy, dz);
110}
111
112void StatefulBaseRenderer::rotate(float degrees) {
113    mSnapshot->transform->rotate(degrees, 0.0f, 0.0f, 1.0f);
114}
115
116void StatefulBaseRenderer::scale(float sx, float sy) {
117    mSnapshot->transform->scale(sx, sy, 1.0f);
118}
119
120void StatefulBaseRenderer::skew(float sx, float sy) {
121    mSnapshot->transform->skew(sx, sy);
122}
123
124void StatefulBaseRenderer::setMatrix(const SkMatrix* matrix) {
125    if (matrix) {
126        mSnapshot->transform->load(*matrix);
127    } else {
128        mSnapshot->transform->loadIdentity();
129    }
130}
131
132void StatefulBaseRenderer::setMatrix(const Matrix4& matrix) {
133    mSnapshot->transform->load(matrix);
134}
135
136void StatefulBaseRenderer::concatMatrix(const SkMatrix* matrix) {
137    mat4 transform(*matrix);
138    mSnapshot->transform->multiply(transform);
139}
140
141void StatefulBaseRenderer::concatMatrix(const Matrix4& matrix) {
142    mSnapshot->transform->multiply(matrix);
143}
144
145///////////////////////////////////////////////////////////////////////////////
146// Clip
147///////////////////////////////////////////////////////////////////////////////
148
149bool StatefulBaseRenderer::clipRect(float left, float top, float right, float bottom, SkRegion::Op op) {
150    if (CC_LIKELY(currentTransform()->rectToRect())) {
151        mDirtyClip |= mSnapshot->clip(left, top, right, bottom, op);
152        return !mSnapshot->clipRect->isEmpty();
153    }
154
155    SkPath path;
156    path.addRect(left, top, right, bottom);
157
158    return StatefulBaseRenderer::clipPath(&path, op);
159}
160
161bool StatefulBaseRenderer::clipPath(const SkPath* path, SkRegion::Op op) {
162    SkMatrix transform;
163    currentTransform()->copyTo(transform);
164
165    SkPath transformed;
166    path->transform(transform, &transformed);
167
168    SkRegion clip;
169    if (!mSnapshot->previous->clipRegion->isEmpty()) {
170        clip.setRegion(*mSnapshot->previous->clipRegion);
171    } else {
172        if (mSnapshot->previous == firstSnapshot()) {
173            clip.setRect(0, 0, getWidth(), getHeight());
174        } else {
175            Rect* bounds = mSnapshot->previous->clipRect;
176            clip.setRect(bounds->left, bounds->top, bounds->right, bounds->bottom);
177        }
178    }
179
180    SkRegion region;
181    region.setPath(transformed, clip);
182
183    mDirtyClip |= mSnapshot->clipRegionTransformed(region, op);
184    return !mSnapshot->clipRect->isEmpty();
185}
186
187bool StatefulBaseRenderer::clipRegion(const SkRegion* region, SkRegion::Op op) {
188    mDirtyClip |= mSnapshot->clipRegionTransformed(*region, op);
189    return !mSnapshot->clipRect->isEmpty();
190}
191
192void StatefulBaseRenderer::setClippingOutline(LinearAllocator& allocator, const Outline* outline) {
193    mSnapshot->setClippingOutline(allocator, outline);
194}
195
196///////////////////////////////////////////////////////////////////////////////
197// Quick Rejection
198///////////////////////////////////////////////////////////////////////////////
199
200/**
201 * Calculates whether content drawn within the passed bounds would be outside of, or intersect with
202 * the clipRect. Does not modify the scissor.
203 *
204 * @param clipRequired if not null, will be set to true if element intersects clip
205 *         (and wasn't rejected)
206 *
207 * @param snapOut if set, the geometry will be treated as having an AA ramp.
208 *         See Rect::snapGeometryToPixelBoundaries()
209 */
210bool StatefulBaseRenderer::calculateQuickRejectForScissor(float left, float top,
211        float right, float bottom,
212        bool* clipRequired, bool* roundRectClipRequired,
213        bool snapOut) const {
214    if (mSnapshot->isIgnored() || bottom <= top || right <= left) {
215        return true;
216    }
217
218    Rect r(left, top, right, bottom);
219    currentTransform()->mapRect(r);
220    r.snapGeometryToPixelBoundaries(snapOut);
221
222    Rect clipRect(*currentClipRect());
223    clipRect.snapToPixelBoundaries();
224
225    if (!clipRect.intersects(r)) return true;
226
227    // clip is required if geometry intersects clip rect
228    if (clipRequired) {
229        *clipRequired = !clipRect.contains(r);
230    }
231
232    // round rect clip is required if RR clip exists, and geometry intersects its corners
233    if (roundRectClipRequired) {
234        *roundRectClipRequired = mSnapshot->roundRectClipState != NULL
235                && mSnapshot->roundRectClipState->areaRequiresRoundRectClip(r);
236    }
237    return false;
238}
239
240/**
241 * Returns false if drawing won't be clipped out.
242 *
243 * Makes the decision conservatively, by rounding out the mapped rect before comparing with the
244 * clipRect. To be used when perfect, pixel accuracy is not possible (esp. with tessellation) but
245 * rejection is still desired.
246 *
247 * This function, unlike quickRejectSetupScissor, should be used where precise geometry information
248 * isn't known (esp. when geometry adjusts based on scale). Generally, this will be first pass
249 * rejection where precise rejection isn't important, or precise information isn't available.
250 */
251bool StatefulBaseRenderer::quickRejectConservative(float left, float top,
252        float right, float bottom) const {
253    if (mSnapshot->isIgnored() || bottom <= top || right <= left) {
254        return true;
255    }
256
257    Rect r(left, top, right, bottom);
258    currentTransform()->mapRect(r);
259    r.roundOut(); // rounded out to be conservative
260
261    Rect clipRect(*currentClipRect());
262    clipRect.snapToPixelBoundaries();
263
264    if (!clipRect.intersects(r)) return true;
265
266    return false;
267}
268
269}; // namespace uirenderer
270}; // namespace android
271