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 #include <SkCanvas.h> 18 19 #include "CanvasState.h" 20 #include "utils/MathUtils.h" 21 22 namespace android { 23 namespace uirenderer { 24 25 26 CanvasState::CanvasState(CanvasStateClient& renderer) 27 : mDirtyClip(false) 28 , mWidth(-1) 29 , mHeight(-1) 30 , mSaveCount(1) 31 , mFirstSnapshot(new Snapshot) 32 , mCanvas(renderer) 33 , mSnapshot(mFirstSnapshot) { 34 35 } 36 37 CanvasState::~CanvasState() { 38 39 } 40 41 void CanvasState::initializeSaveStack(float clipLeft, float clipTop, 42 float clipRight, float clipBottom, const Vector3& lightCenter) { 43 mSnapshot = new Snapshot(mFirstSnapshot, 44 SkCanvas::kMatrix_SaveFlag | SkCanvas::kClip_SaveFlag); 45 mSnapshot->setClip(clipLeft, clipTop, clipRight, clipBottom); 46 mSnapshot->fbo = mCanvas.getTargetFbo(); 47 mSnapshot->setRelativeLightCenter(lightCenter); 48 mSaveCount = 1; 49 } 50 51 void CanvasState::setViewport(int width, int height) { 52 mWidth = width; 53 mHeight = height; 54 mFirstSnapshot->initializeViewport(width, height); 55 mCanvas.onViewportInitialized(); 56 57 // create a temporary 1st snapshot, so old snapshots are released, 58 // and viewport can be queried safely. 59 // TODO: remove, combine viewport + save stack initialization 60 mSnapshot = new Snapshot(mFirstSnapshot, 61 SkCanvas::kMatrix_SaveFlag | SkCanvas::kClip_SaveFlag); 62 mSaveCount = 1; 63 } 64 65 /////////////////////////////////////////////////////////////////////////////// 66 // Save (layer) 67 /////////////////////////////////////////////////////////////////////////////// 68 69 /** 70 * Guaranteed to save without side-effects 71 * 72 * This approach, here and in restoreSnapshot(), allows subclasses to directly manipulate the save 73 * stack, and ensures restoreToCount() doesn't call back into subclass overrides. 74 */ 75 int CanvasState::saveSnapshot(int flags) { 76 mSnapshot = new Snapshot(mSnapshot, flags); 77 return mSaveCount++; 78 } 79 80 int CanvasState::save(int flags) { 81 return saveSnapshot(flags); 82 } 83 84 /** 85 * Guaranteed to restore without side-effects. 86 */ 87 void CanvasState::restoreSnapshot() { 88 sp<Snapshot> toRemove = mSnapshot; 89 sp<Snapshot> toRestore = mSnapshot->previous; 90 91 mSaveCount--; 92 mSnapshot = toRestore; 93 94 // subclass handles restore implementation 95 mCanvas.onSnapshotRestored(*toRemove, *toRestore); 96 } 97 98 void CanvasState::restore() { 99 if (mSaveCount > 1) { 100 restoreSnapshot(); 101 } 102 } 103 104 void CanvasState::restoreToCount(int saveCount) { 105 if (saveCount < 1) saveCount = 1; 106 107 while (mSaveCount > saveCount) { 108 restoreSnapshot(); 109 } 110 } 111 112 /////////////////////////////////////////////////////////////////////////////// 113 // Matrix 114 /////////////////////////////////////////////////////////////////////////////// 115 116 void CanvasState::getMatrix(SkMatrix* matrix) const { 117 mSnapshot->transform->copyTo(*matrix); 118 } 119 120 void CanvasState::translate(float dx, float dy, float dz) { 121 mSnapshot->transform->translate(dx, dy, dz); 122 } 123 124 void CanvasState::rotate(float degrees) { 125 mSnapshot->transform->rotate(degrees, 0.0f, 0.0f, 1.0f); 126 } 127 128 void CanvasState::scale(float sx, float sy) { 129 mSnapshot->transform->scale(sx, sy, 1.0f); 130 } 131 132 void CanvasState::skew(float sx, float sy) { 133 mSnapshot->transform->skew(sx, sy); 134 } 135 136 void CanvasState::setMatrix(const SkMatrix& matrix) { 137 mSnapshot->transform->load(matrix); 138 } 139 140 void CanvasState::setMatrix(const Matrix4& matrix) { 141 mSnapshot->transform->load(matrix); 142 } 143 144 void CanvasState::concatMatrix(const SkMatrix& matrix) { 145 mat4 transform(matrix); 146 mSnapshot->transform->multiply(transform); 147 } 148 149 void CanvasState::concatMatrix(const Matrix4& matrix) { 150 mSnapshot->transform->multiply(matrix); 151 } 152 153 /////////////////////////////////////////////////////////////////////////////// 154 // Clip 155 /////////////////////////////////////////////////////////////////////////////// 156 157 bool CanvasState::clipRect(float left, float top, float right, float bottom, SkRegion::Op op) { 158 mDirtyClip |= mSnapshot->clip(left, top, right, bottom, op); 159 return !mSnapshot->clipIsEmpty(); 160 } 161 162 bool CanvasState::clipPath(const SkPath* path, SkRegion::Op op) { 163 mDirtyClip |= mSnapshot->clipPath(*path, op); 164 return !mSnapshot->clipIsEmpty(); 165 } 166 167 bool CanvasState::clipRegion(const SkRegion* region, SkRegion::Op op) { 168 mDirtyClip |= mSnapshot->clipRegionTransformed(*region, op); 169 return !mSnapshot->clipIsEmpty(); 170 } 171 172 void CanvasState::setClippingOutline(LinearAllocator& allocator, const Outline* outline) { 173 Rect bounds; 174 float radius; 175 if (!outline->getAsRoundRect(&bounds, &radius)) return; // only RR supported 176 177 bool outlineIsRounded = MathUtils::isPositive(radius); 178 if (!outlineIsRounded || currentTransform()->isSimple()) { 179 // TODO: consider storing this rect separately, so that this can't be replaced with clip ops 180 clipRect(bounds.left, bounds.top, bounds.right, bounds.bottom, SkRegion::kIntersect_Op); 181 } 182 if (outlineIsRounded) { 183 setClippingRoundRect(allocator, bounds, radius, false); 184 } 185 } 186 187 void CanvasState::setClippingRoundRect(LinearAllocator& allocator, 188 const Rect& rect, float radius, bool highPriority) { 189 mSnapshot->setClippingRoundRect(allocator, rect, radius, highPriority); 190 } 191 192 void CanvasState::setProjectionPathMask(LinearAllocator& allocator, const SkPath* path) { 193 mSnapshot->setProjectionPathMask(allocator, path); 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 */ 210 bool CanvasState::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 != nullptr 235 && mSnapshot->roundRectClipState->areaRequiresRoundRectClip(r); 236 } 237 return false; 238 } 239 240 bool CanvasState::quickRejectConservative(float left, float top, 241 float right, float bottom) const { 242 if (mSnapshot->isIgnored() || bottom <= top || right <= left) { 243 return true; 244 } 245 246 Rect r(left, top, right, bottom); 247 currentTransform()->mapRect(r); 248 r.roundOut(); // rounded out to be conservative 249 250 Rect clipRect(currentClipRect()); 251 clipRect.snapToPixelBoundaries(); 252 253 if (!clipRect.intersects(r)) return true; 254 255 return false; 256 } 257 258 } // namespace uirenderer 259 } // namespace android 260