John Reck | 5cb290b | 2021-02-01 13:47:31 -0500 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2021 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 "StretchEffect.h" |
Nader Jawad | 6701a60 | 2021-02-23 18:14:22 -0800 | [diff] [blame] | 18 | #include <SkImageFilter.h> |
| 19 | #include <SkRefCnt.h> |
| 20 | #include <SkRuntimeEffect.h> |
| 21 | #include <SkString.h> |
| 22 | #include <SkSurface.h> |
| 23 | #include <include/effects/SkImageFilters.h> |
| 24 | |
| 25 | #include <memory> |
John Reck | 5cb290b | 2021-02-01 13:47:31 -0500 | [diff] [blame] | 26 | |
| 27 | namespace android::uirenderer { |
| 28 | |
Nader Jawad | 6701a60 | 2021-02-23 18:14:22 -0800 | [diff] [blame] | 29 | static const SkString stretchShader = SkString(R"( |
| 30 | uniform shader uContentTexture; |
| 31 | |
| 32 | // multiplier to apply to scale effect |
| 33 | uniform float uMaxStretchIntensity; |
| 34 | |
| 35 | // Maximum percentage to stretch beyond bounds of target |
Nader Jawad | a225d21 | 2021-03-17 15:12:58 -0700 | [diff] [blame] | 36 | uniform float uStretchAffectedDistX; |
| 37 | uniform float uStretchAffectedDistY; |
Nader Jawad | 6701a60 | 2021-02-23 18:14:22 -0800 | [diff] [blame] | 38 | |
| 39 | // Distance stretched as a function of the normalized overscroll times |
| 40 | // scale intensity |
| 41 | uniform float uDistanceStretchedX; |
| 42 | uniform float uDistanceStretchedY; |
Nader Jawad | ebb26b1 | 2021-04-01 15:54:09 -0700 | [diff] [blame] | 43 | uniform float uInverseDistanceStretchedX; |
| 44 | uniform float uInverseDistanceStretchedY; |
Nader Jawad | 6701a60 | 2021-02-23 18:14:22 -0800 | [diff] [blame] | 45 | uniform float uDistDiffX; |
| 46 | |
| 47 | // Difference between the peak stretch amount and overscroll amount normalized |
| 48 | uniform float uDistDiffY; |
| 49 | |
| 50 | // Horizontal offset represented as a ratio of pixels divided by the target width |
| 51 | uniform float uScrollX; |
| 52 | // Vertical offset represented as a ratio of pixels divided by the target height |
| 53 | uniform float uScrollY; |
| 54 | |
| 55 | // Normalized overscroll amount in the horizontal direction |
| 56 | uniform float uOverscrollX; |
| 57 | |
| 58 | // Normalized overscroll amount in the vertical direction |
| 59 | uniform float uOverscrollY; |
| 60 | uniform float viewportWidth; // target height in pixels |
| 61 | uniform float viewportHeight; // target width in pixels |
| 62 | |
Michel Comin Escude | 9ed8614 | 2021-04-13 12:30:51 -0700 | [diff] [blame] | 63 | // uInterpolationStrength is the intensity of the interpolation. |
| 64 | // if uInterpolationStrength is 0, then the stretch is constant for all the |
| 65 | // uStretchAffectedDist. if uInterpolationStrength is 1, then stretch intensity |
| 66 | // is interpolated based on the pixel position in the uStretchAffectedDist area; |
| 67 | // The closer we are from the scroll anchor point, the more it stretches, |
| 68 | // and the other way around. |
| 69 | uniform float uInterpolationStrength; |
| 70 | |
Nader Jawad | bc34186 | 2021-05-06 10:48:18 -0700 | [diff] [blame] | 71 | float easeIn(float t, float d) { |
| 72 | return t * d; |
Nader Jawad | ebb26b1 | 2021-04-01 15:54:09 -0700 | [diff] [blame] | 73 | } |
| 74 | |
Nader Jawad | 7148aa7 | 2021-03-31 13:11:57 -0700 | [diff] [blame] | 75 | float computeOverscrollStart( |
Nader Jawad | 6701a60 | 2021-02-23 18:14:22 -0800 | [diff] [blame] | 76 | float inPos, |
| 77 | float overscroll, |
| 78 | float uStretchAffectedDist, |
Nader Jawad | ebb26b1 | 2021-04-01 15:54:09 -0700 | [diff] [blame] | 79 | float uInverseStretchAffectedDist, |
Michel Comin Escude | 9ed8614 | 2021-04-13 12:30:51 -0700 | [diff] [blame] | 80 | float distanceStretched, |
| 81 | float interpolationStrength |
Nader Jawad | 6701a60 | 2021-02-23 18:14:22 -0800 | [diff] [blame] | 82 | ) { |
| 83 | float offsetPos = uStretchAffectedDist - inPos; |
Michel Comin Escude | 9ed8614 | 2021-04-13 12:30:51 -0700 | [diff] [blame] | 84 | float posBasedVariation = mix( |
Nader Jawad | bc34186 | 2021-05-06 10:48:18 -0700 | [diff] [blame] | 85 | 1. ,easeIn(offsetPos, uInverseStretchAffectedDist), interpolationStrength); |
Nader Jawad | 6701a60 | 2021-02-23 18:14:22 -0800 | [diff] [blame] | 86 | float stretchIntensity = overscroll * posBasedVariation; |
Nader Jawad | 7148aa7 | 2021-03-31 13:11:57 -0700 | [diff] [blame] | 87 | return distanceStretched - (offsetPos / (1. + stretchIntensity)); |
Nader Jawad | 6701a60 | 2021-02-23 18:14:22 -0800 | [diff] [blame] | 88 | } |
| 89 | |
Nader Jawad | 7148aa7 | 2021-03-31 13:11:57 -0700 | [diff] [blame] | 90 | float computeOverscrollEnd( |
Nader Jawad | 6701a60 | 2021-02-23 18:14:22 -0800 | [diff] [blame] | 91 | float inPos, |
| 92 | float overscroll, |
| 93 | float reverseStretchDist, |
| 94 | float uStretchAffectedDist, |
Nader Jawad | ebb26b1 | 2021-04-01 15:54:09 -0700 | [diff] [blame] | 95 | float uInverseStretchAffectedDist, |
Michel Comin Escude | 9ed8614 | 2021-04-13 12:30:51 -0700 | [diff] [blame] | 96 | float distanceStretched, |
Nader Jawad | 76d84ae | 2021-05-13 20:43:18 -0700 | [diff] [blame] | 97 | float interpolationStrength, |
| 98 | float viewportDimension |
Nader Jawad | 6701a60 | 2021-02-23 18:14:22 -0800 | [diff] [blame] | 99 | ) { |
| 100 | float offsetPos = inPos - reverseStretchDist; |
Michel Comin Escude | 9ed8614 | 2021-04-13 12:30:51 -0700 | [diff] [blame] | 101 | float posBasedVariation = mix( |
Nader Jawad | bc34186 | 2021-05-06 10:48:18 -0700 | [diff] [blame] | 102 | 1. ,easeIn(offsetPos, uInverseStretchAffectedDist), interpolationStrength); |
Nader Jawad | 6701a60 | 2021-02-23 18:14:22 -0800 | [diff] [blame] | 103 | float stretchIntensity = (-overscroll) * posBasedVariation; |
Nader Jawad | 76d84ae | 2021-05-13 20:43:18 -0700 | [diff] [blame] | 104 | return viewportDimension - (distanceStretched - (offsetPos / (1. + stretchIntensity))); |
Nader Jawad | 6701a60 | 2021-02-23 18:14:22 -0800 | [diff] [blame] | 105 | } |
| 106 | |
Nader Jawad | 7148aa7 | 2021-03-31 13:11:57 -0700 | [diff] [blame] | 107 | // Prefer usage of return values over out parameters as it enables |
| 108 | // SKSL to properly inline method calls and works around potential GPU |
| 109 | // driver issues on Wembly. See b/182566543 for details |
| 110 | float computeOverscroll( |
Nader Jawad | 6701a60 | 2021-02-23 18:14:22 -0800 | [diff] [blame] | 111 | float inPos, |
| 112 | float overscroll, |
| 113 | float uStretchAffectedDist, |
Nader Jawad | ebb26b1 | 2021-04-01 15:54:09 -0700 | [diff] [blame] | 114 | float uInverseStretchAffectedDist, |
Nader Jawad | 6701a60 | 2021-02-23 18:14:22 -0800 | [diff] [blame] | 115 | float distanceStretched, |
Michel Comin Escude | 9ed8614 | 2021-04-13 12:30:51 -0700 | [diff] [blame] | 116 | float distanceDiff, |
Nader Jawad | 76d84ae | 2021-05-13 20:43:18 -0700 | [diff] [blame] | 117 | float interpolationStrength, |
| 118 | float viewportDimension |
Nader Jawad | 6701a60 | 2021-02-23 18:14:22 -0800 | [diff] [blame] | 119 | ) { |
Nader Jawad | 7148aa7 | 2021-03-31 13:11:57 -0700 | [diff] [blame] | 120 | if (overscroll > 0) { |
Nader Jawad | 91a55b6 | 2021-05-13 19:08:04 -0700 | [diff] [blame] | 121 | if (inPos <= uStretchAffectedDist) { |
| 122 | return computeOverscrollStart( |
| 123 | inPos, |
| 124 | overscroll, |
| 125 | uStretchAffectedDist, |
| 126 | uInverseStretchAffectedDist, |
| 127 | distanceStretched, |
| 128 | interpolationStrength |
| 129 | ); |
| 130 | } else { |
| 131 | return distanceDiff + inPos; |
Nader Jawad | 6701a60 | 2021-02-23 18:14:22 -0800 | [diff] [blame] | 132 | } |
Nader Jawad | 91a55b6 | 2021-05-13 19:08:04 -0700 | [diff] [blame] | 133 | } else if (overscroll < 0) { |
Nader Jawad | 76d84ae | 2021-05-13 20:43:18 -0700 | [diff] [blame] | 134 | float stretchAffectedDist = viewportDimension - uStretchAffectedDist; |
Nader Jawad | 91a55b6 | 2021-05-13 19:08:04 -0700 | [diff] [blame] | 135 | if (inPos >= stretchAffectedDist) { |
| 136 | return computeOverscrollEnd( |
| 137 | inPos, |
| 138 | overscroll, |
| 139 | stretchAffectedDist, |
| 140 | uStretchAffectedDist, |
| 141 | uInverseStretchAffectedDist, |
| 142 | distanceStretched, |
Nader Jawad | 76d84ae | 2021-05-13 20:43:18 -0700 | [diff] [blame] | 143 | interpolationStrength, |
| 144 | viewportDimension |
Nader Jawad | 91a55b6 | 2021-05-13 19:08:04 -0700 | [diff] [blame] | 145 | ); |
| 146 | } else { |
| 147 | return -distanceDiff + inPos; |
Nader Jawad | 6701a60 | 2021-02-23 18:14:22 -0800 | [diff] [blame] | 148 | } |
Nader Jawad | 91a55b6 | 2021-05-13 19:08:04 -0700 | [diff] [blame] | 149 | } else { |
| 150 | return inPos; |
| 151 | } |
Nader Jawad | 6701a60 | 2021-02-23 18:14:22 -0800 | [diff] [blame] | 152 | } |
| 153 | |
| 154 | vec4 main(vec2 coord) { |
Nader Jawad | 76d84ae | 2021-05-13 20:43:18 -0700 | [diff] [blame] | 155 | float inU = coord.x; |
| 156 | float inV = coord.y; |
Nader Jawad | 6701a60 | 2021-02-23 18:14:22 -0800 | [diff] [blame] | 157 | float outU; |
| 158 | float outV; |
Nader Jawad | 76d84ae | 2021-05-13 20:43:18 -0700 | [diff] [blame] | 159 | |
Nader Jawad | 6701a60 | 2021-02-23 18:14:22 -0800 | [diff] [blame] | 160 | inU += uScrollX; |
| 161 | inV += uScrollY; |
Nader Jawad | 7148aa7 | 2021-03-31 13:11:57 -0700 | [diff] [blame] | 162 | outU = computeOverscroll( |
Nader Jawad | 6701a60 | 2021-02-23 18:14:22 -0800 | [diff] [blame] | 163 | inU, |
| 164 | uOverscrollX, |
Nader Jawad | a225d21 | 2021-03-17 15:12:58 -0700 | [diff] [blame] | 165 | uStretchAffectedDistX, |
Nader Jawad | ebb26b1 | 2021-04-01 15:54:09 -0700 | [diff] [blame] | 166 | uInverseDistanceStretchedX, |
Nader Jawad | 6701a60 | 2021-02-23 18:14:22 -0800 | [diff] [blame] | 167 | uDistanceStretchedX, |
Michel Comin Escude | 9ed8614 | 2021-04-13 12:30:51 -0700 | [diff] [blame] | 168 | uDistDiffX, |
Nader Jawad | 76d84ae | 2021-05-13 20:43:18 -0700 | [diff] [blame] | 169 | uInterpolationStrength, |
| 170 | viewportWidth |
Nader Jawad | 6701a60 | 2021-02-23 18:14:22 -0800 | [diff] [blame] | 171 | ); |
Nader Jawad | 7148aa7 | 2021-03-31 13:11:57 -0700 | [diff] [blame] | 172 | outV = computeOverscroll( |
Nader Jawad | 6701a60 | 2021-02-23 18:14:22 -0800 | [diff] [blame] | 173 | inV, |
| 174 | uOverscrollY, |
Nader Jawad | a225d21 | 2021-03-17 15:12:58 -0700 | [diff] [blame] | 175 | uStretchAffectedDistY, |
Nader Jawad | ebb26b1 | 2021-04-01 15:54:09 -0700 | [diff] [blame] | 176 | uInverseDistanceStretchedY, |
Nader Jawad | 6701a60 | 2021-02-23 18:14:22 -0800 | [diff] [blame] | 177 | uDistanceStretchedY, |
Michel Comin Escude | 9ed8614 | 2021-04-13 12:30:51 -0700 | [diff] [blame] | 178 | uDistDiffY, |
Nader Jawad | 76d84ae | 2021-05-13 20:43:18 -0700 | [diff] [blame] | 179 | uInterpolationStrength, |
| 180 | viewportHeight |
Nader Jawad | 6701a60 | 2021-02-23 18:14:22 -0800 | [diff] [blame] | 181 | ); |
Nader Jawad | 76d84ae | 2021-05-13 20:43:18 -0700 | [diff] [blame] | 182 | coord.x = outU; |
| 183 | coord.y = outV; |
Brian Osman | bb10b9c | 2021-09-07 20:12:32 +0000 | [diff] [blame] | 184 | return uContentTexture.eval(coord); |
Nader Jawad | 6701a60 | 2021-02-23 18:14:22 -0800 | [diff] [blame] | 185 | })"); |
| 186 | |
| 187 | static const float ZERO = 0.f; |
Michel Comin Escude | 9ed8614 | 2021-04-13 12:30:51 -0700 | [diff] [blame] | 188 | static const float INTERPOLATION_STRENGTH_VALUE = 0.7f; |
Nader Jawad | 3206cce | 2021-06-23 11:48:58 -0700 | [diff] [blame] | 189 | static const char CONTENT_TEXTURE[] = "uContentTexture"; |
Nader Jawad | 6701a60 | 2021-02-23 18:14:22 -0800 | [diff] [blame] | 190 | |
Nader Jawad | 197743f | 2021-04-19 19:45:13 -0700 | [diff] [blame] | 191 | sk_sp<SkShader> StretchEffect::getShader(float width, float height, |
Nader Jawad | 6aff481 | 2021-06-09 10:14:43 -0700 | [diff] [blame] | 192 | const sk_sp<SkImage>& snapshotImage, |
| 193 | const SkMatrix* matrix) const { |
Nader Jawad | 6701a60 | 2021-02-23 18:14:22 -0800 | [diff] [blame] | 194 | if (isEmpty()) { |
| 195 | return nullptr; |
| 196 | } |
| 197 | |
Nader Jawad | a225d21 | 2021-03-17 15:12:58 -0700 | [diff] [blame] | 198 | float normOverScrollDistX = mStretchDirection.x(); |
| 199 | float normOverScrollDistY = mStretchDirection.y(); |
Nader Jawad | 76d84ae | 2021-05-13 20:43:18 -0700 | [diff] [blame] | 200 | float distanceStretchedX = width / (1 + abs(normOverScrollDistX)); |
| 201 | float distanceStretchedY = height / (1 + abs(normOverScrollDistY)); |
| 202 | float inverseDistanceStretchedX = 1.f / width; |
| 203 | float inverseDistanceStretchedY = 1.f / height; |
| 204 | float diffX = distanceStretchedX - width; |
| 205 | float diffY = distanceStretchedY - height; |
Nader Jawad | 6701a60 | 2021-02-23 18:14:22 -0800 | [diff] [blame] | 206 | |
| 207 | if (mBuilder == nullptr) { |
| 208 | mBuilder = std::make_unique<SkRuntimeShaderBuilder>(getStretchEffect()); |
| 209 | } |
| 210 | |
Nader Jawad | 3206cce | 2021-06-23 11:48:58 -0700 | [diff] [blame] | 211 | mBuilder->child(CONTENT_TEXTURE) = |
Nader Jawad | 6aff481 | 2021-06-09 10:14:43 -0700 | [diff] [blame] | 212 | snapshotImage->makeShader(SkTileMode::kClamp, SkTileMode::kClamp, |
| 213 | SkSamplingOptions(SkFilterMode::kLinear), matrix); |
Michel Comin Escude | 9ed8614 | 2021-04-13 12:30:51 -0700 | [diff] [blame] | 214 | mBuilder->uniform("uInterpolationStrength").set(&INTERPOLATION_STRENGTH_VALUE, 1); |
Nader Jawad | 76d84ae | 2021-05-13 20:43:18 -0700 | [diff] [blame] | 215 | mBuilder->uniform("uStretchAffectedDistX").set(&width, 1); |
| 216 | mBuilder->uniform("uStretchAffectedDistY").set(&height, 1); |
Nader Jawad | 6701a60 | 2021-02-23 18:14:22 -0800 | [diff] [blame] | 217 | mBuilder->uniform("uDistanceStretchedX").set(&distanceStretchedX, 1); |
| 218 | mBuilder->uniform("uDistanceStretchedY").set(&distanceStretchedY, 1); |
Nader Jawad | ebb26b1 | 2021-04-01 15:54:09 -0700 | [diff] [blame] | 219 | mBuilder->uniform("uInverseDistanceStretchedX").set(&inverseDistanceStretchedX, 1); |
| 220 | mBuilder->uniform("uInverseDistanceStretchedY").set(&inverseDistanceStretchedY, 1); |
Nader Jawad | 6701a60 | 2021-02-23 18:14:22 -0800 | [diff] [blame] | 221 | mBuilder->uniform("uDistDiffX").set(&diffX, 1); |
| 222 | mBuilder->uniform("uDistDiffY").set(&diffY, 1); |
| 223 | mBuilder->uniform("uOverscrollX").set(&normOverScrollDistX, 1); |
| 224 | mBuilder->uniform("uOverscrollY").set(&normOverScrollDistY, 1); |
| 225 | mBuilder->uniform("uScrollX").set(&ZERO, 1); |
| 226 | mBuilder->uniform("uScrollY").set(&ZERO, 1); |
Nader Jawad | 197743f | 2021-04-19 19:45:13 -0700 | [diff] [blame] | 227 | mBuilder->uniform("viewportWidth").set(&width, 1); |
| 228 | mBuilder->uniform("viewportHeight").set(&height, 1); |
Nader Jawad | 6701a60 | 2021-02-23 18:14:22 -0800 | [diff] [blame] | 229 | |
Brian Osman | bb7c43d | 2022-02-03 14:48:12 -0500 | [diff] [blame] | 230 | auto result = mBuilder->makeShader(); |
Nader Jawad | 3206cce | 2021-06-23 11:48:58 -0700 | [diff] [blame] | 231 | mBuilder->child(CONTENT_TEXTURE) = nullptr; |
| 232 | return result; |
Nader Jawad | 6701a60 | 2021-02-23 18:14:22 -0800 | [diff] [blame] | 233 | } |
| 234 | |
| 235 | sk_sp<SkRuntimeEffect> StretchEffect::getStretchEffect() { |
Brian Osman | 64ee324 | 2021-04-20 19:46:39 +0000 | [diff] [blame] | 236 | const static SkRuntimeEffect::Result instance = SkRuntimeEffect::MakeForShader(stretchShader); |
Nader Jawad | 6701a60 | 2021-02-23 18:14:22 -0800 | [diff] [blame] | 237 | return instance.effect; |
John Reck | 5cb290b | 2021-02-01 13:47:31 -0500 | [diff] [blame] | 238 | } |
| 239 | |
Nader Jawad | bc34186 | 2021-05-06 10:48:18 -0700 | [diff] [blame] | 240 | /** |
| 241 | * Helper method that maps the input texture position to the stretch position |
| 242 | * based on the given overscroll value that represents an overscroll from |
| 243 | * either the top or left |
| 244 | * @param overscroll current overscroll value |
| 245 | * @param input normalized input position (can be x or y) on the input texture |
| 246 | * @return stretched position of the input normalized from 0 to 1 |
| 247 | */ |
| 248 | float reverseMapStart(float overscroll, float input) { |
| 249 | float numerator = (-input * overscroll * overscroll) - |
| 250 | (2 * input * overscroll) - input; |
| 251 | float denominator = 1.f + (.3f * overscroll) + |
| 252 | (.7f * input * overscroll * overscroll) + (.7f * input * overscroll); |
| 253 | return -(numerator / denominator); |
| 254 | } |
| 255 | |
| 256 | /** |
| 257 | * Helper method that maps the input texture position to the stretch position |
| 258 | * based on the given overscroll value that represents an overscroll from |
| 259 | * either the bottom or right |
| 260 | * @param overscroll current overscroll value |
| 261 | * @param input normalized input position (can be x or y) on the input texture |
| 262 | * @return stretched position of the input normalized from 0 to 1 |
| 263 | */ |
| 264 | float reverseMapEnd(float overscroll, float input) { |
| 265 | float numerator = (.3f * overscroll * overscroll) - |
| 266 | (.3f * input * overscroll * overscroll) + |
| 267 | (1.3f * input * overscroll) - overscroll - input; |
| 268 | float denominator = (.7f * input * overscroll * overscroll) - |
| 269 | (.7f * input * overscroll) - (.7f * overscroll * overscroll) + |
| 270 | overscroll - 1.f; |
| 271 | return numerator / denominator; |
| 272 | } |
| 273 | |
| 274 | /** |
| 275 | * Calculates the normalized stretch position given the normalized input |
| 276 | * position. This handles calculating the overscroll from either the |
| 277 | * top or left vs bottom or right depending on the sign of the given overscroll |
| 278 | * value |
| 279 | * |
| 280 | * @param overscroll unit vector of overscroll from -1 to 1 indicating overscroll |
| 281 | * from the bottom or right vs top or left respectively |
| 282 | * @param normalizedInput the |
| 283 | * @return |
| 284 | */ |
| 285 | float computeReverseOverscroll(float overscroll, float normalizedInput) { |
| 286 | float distanceStretched = 1.f / (1.f + abs(overscroll)); |
| 287 | float distanceDiff = distanceStretched - 1.f; |
| 288 | if (overscroll > 0) { |
| 289 | float output = reverseMapStart(overscroll, normalizedInput); |
| 290 | if (output <= 1.0f) { |
| 291 | return output; |
| 292 | } else if (output >= distanceStretched){ |
| 293 | return output - distanceDiff; |
| 294 | } |
| 295 | } |
| 296 | |
| 297 | if (overscroll < 0) { |
| 298 | float output = reverseMapEnd(overscroll, normalizedInput); |
| 299 | if (output >= 0.f) { |
| 300 | return output; |
| 301 | } else if (output < 0.f){ |
| 302 | return output + distanceDiff; |
| 303 | } |
| 304 | } |
| 305 | return normalizedInput; |
| 306 | } |
| 307 | |
| 308 | float StretchEffect::computeStretchedPositionX(float normalizedX) const { |
| 309 | return computeReverseOverscroll(mStretchDirection.x(), normalizedX); |
| 310 | } |
| 311 | |
| 312 | float StretchEffect::computeStretchedPositionY(float normalizedY) const { |
| 313 | return computeReverseOverscroll(mStretchDirection.y(), normalizedY); |
| 314 | } |
| 315 | |
John Reck | 5cb290b | 2021-02-01 13:47:31 -0500 | [diff] [blame] | 316 | } // namespace android::uirenderer |