SkPatchUtils.cpp revision 795c5ea6572ca8b58961ed64d628cc407005f1b3
1ecfff21bde1f0ca3c36533eded325066b5f2d42ddandov/* 2ecfff21bde1f0ca3c36533eded325066b5f2d42ddandov * Copyright 2014 Google Inc. 3ecfff21bde1f0ca3c36533eded325066b5f2d42ddandov * 4ecfff21bde1f0ca3c36533eded325066b5f2d42ddandov * Use of this source code is governed by a BSD-style license that can be 5ecfff21bde1f0ca3c36533eded325066b5f2d42ddandov * found in the LICENSE file. 6ecfff21bde1f0ca3c36533eded325066b5f2d42ddandov */ 7ecfff21bde1f0ca3c36533eded325066b5f2d42ddandov 8ecfff21bde1f0ca3c36533eded325066b5f2d42ddandov#include "SkPatchUtils.h" 9ecfff21bde1f0ca3c36533eded325066b5f2d42ddandov 10b3c9d1c33caf325aada244204215eb790c228c12dandov#include "SkColorPriv.h" 11b3c9d1c33caf325aada244204215eb790c228c12dandov#include "SkGeometry.h" 12b3c9d1c33caf325aada244204215eb790c228c12dandov 13b3c9d1c33caf325aada244204215eb790c228c12dandov/** 14b3c9d1c33caf325aada244204215eb790c228c12dandov * Evaluator to sample the values of a cubic bezier using forward differences. 15b3c9d1c33caf325aada244204215eb790c228c12dandov * Forward differences is a method for evaluating a nth degree polynomial at a uniform step by only 16b3c9d1c33caf325aada244204215eb790c228c12dandov * adding precalculated values. 17b3c9d1c33caf325aada244204215eb790c228c12dandov * For a linear example we have the function f(t) = m*t+b, then the value of that function at t+h 18b3c9d1c33caf325aada244204215eb790c228c12dandov * would be f(t+h) = m*(t+h)+b. If we want to know the uniform step that we must add to the first 19b3c9d1c33caf325aada244204215eb790c228c12dandov * evaluation f(t) then we need to substract f(t+h) - f(t) = m*t + m*h + b - m*t + b = mh. After 20b3c9d1c33caf325aada244204215eb790c228c12dandov * obtaining this value (mh) we could just add this constant step to our first sampled point 21b3c9d1c33caf325aada244204215eb790c228c12dandov * to compute the next one. 22b3c9d1c33caf325aada244204215eb790c228c12dandov * 23b3c9d1c33caf325aada244204215eb790c228c12dandov * For the cubic case the first difference gives as a result a quadratic polynomial to which we can 24b3c9d1c33caf325aada244204215eb790c228c12dandov * apply again forward differences and get linear function to which we can apply again forward 25b3c9d1c33caf325aada244204215eb790c228c12dandov * differences to get a constant difference. This is why we keep an array of size 4, the 0th 26b3c9d1c33caf325aada244204215eb790c228c12dandov * position keeps the sampled value while the next ones keep the quadratic, linear and constant 27b3c9d1c33caf325aada244204215eb790c228c12dandov * difference values. 28b3c9d1c33caf325aada244204215eb790c228c12dandov */ 29b3c9d1c33caf325aada244204215eb790c228c12dandov 30b3c9d1c33caf325aada244204215eb790c228c12dandovclass FwDCubicEvaluator { 319d524f22bfde5dc3dc8f48e1be39bdebd3bb0304halcanary 32b3c9d1c33caf325aada244204215eb790c228c12dandovpublic: 339d524f22bfde5dc3dc8f48e1be39bdebd3bb0304halcanary 34b3c9d1c33caf325aada244204215eb790c228c12dandov /** 35b3c9d1c33caf325aada244204215eb790c228c12dandov * Receives the 4 control points of the cubic bezier. 36b3c9d1c33caf325aada244204215eb790c228c12dandov */ 379d524f22bfde5dc3dc8f48e1be39bdebd3bb0304halcanary 385ba2b9612ae4bc3a244bf45f1ec55c3a5a41e181caryclark explicit FwDCubicEvaluator(const SkPoint points[4]) 395ba2b9612ae4bc3a244bf45f1ec55c3a5a41e181caryclark : fCoefs(points) { 40b3c9d1c33caf325aada244204215eb790c228c12dandov memcpy(fPoints, points, 4 * sizeof(SkPoint)); 419d524f22bfde5dc3dc8f48e1be39bdebd3bb0304halcanary 42b3c9d1c33caf325aada244204215eb790c228c12dandov this->restart(1); 43b3c9d1c33caf325aada244204215eb790c228c12dandov } 449d524f22bfde5dc3dc8f48e1be39bdebd3bb0304halcanary 45b3c9d1c33caf325aada244204215eb790c228c12dandov /** 46b3c9d1c33caf325aada244204215eb790c228c12dandov * Restarts the forward differences evaluator to the first value of t = 0. 47b3c9d1c33caf325aada244204215eb790c228c12dandov */ 48b3c9d1c33caf325aada244204215eb790c228c12dandov void restart(int divisions) { 49b3c9d1c33caf325aada244204215eb790c228c12dandov fDivisions = divisions; 50b3c9d1c33caf325aada244204215eb790c228c12dandov fCurrent = 0; 51b3c9d1c33caf325aada244204215eb790c228c12dandov fMax = fDivisions + 1; 525ba2b9612ae4bc3a244bf45f1ec55c3a5a41e181caryclark Sk2s h = Sk2s(1.f / fDivisions); 535ba2b9612ae4bc3a244bf45f1ec55c3a5a41e181caryclark Sk2s h2 = h * h; 545ba2b9612ae4bc3a244bf45f1ec55c3a5a41e181caryclark Sk2s h3 = h2 * h; 555ba2b9612ae4bc3a244bf45f1ec55c3a5a41e181caryclark Sk2s fwDiff3 = Sk2s(6) * fCoefs.fA * h3; 565ba2b9612ae4bc3a244bf45f1ec55c3a5a41e181caryclark fFwDiff[3] = to_point(fwDiff3); 575ba2b9612ae4bc3a244bf45f1ec55c3a5a41e181caryclark fFwDiff[2] = to_point(fwDiff3 + times_2(fCoefs.fB) * h2); 585ba2b9612ae4bc3a244bf45f1ec55c3a5a41e181caryclark fFwDiff[1] = to_point(fCoefs.fA * h3 + fCoefs.fB * h2 + fCoefs.fC * h); 595ba2b9612ae4bc3a244bf45f1ec55c3a5a41e181caryclark fFwDiff[0] = to_point(fCoefs.fD); 60b3c9d1c33caf325aada244204215eb790c228c12dandov } 619d524f22bfde5dc3dc8f48e1be39bdebd3bb0304halcanary 62b3c9d1c33caf325aada244204215eb790c228c12dandov /** 63b3c9d1c33caf325aada244204215eb790c228c12dandov * Check if the evaluator is still within the range of 0<=t<=1 64b3c9d1c33caf325aada244204215eb790c228c12dandov */ 65b3c9d1c33caf325aada244204215eb790c228c12dandov bool done() const { 66b3c9d1c33caf325aada244204215eb790c228c12dandov return fCurrent > fMax; 67b3c9d1c33caf325aada244204215eb790c228c12dandov } 689d524f22bfde5dc3dc8f48e1be39bdebd3bb0304halcanary 69b3c9d1c33caf325aada244204215eb790c228c12dandov /** 70b3c9d1c33caf325aada244204215eb790c228c12dandov * Call next to obtain the SkPoint sampled and move to the next one. 71b3c9d1c33caf325aada244204215eb790c228c12dandov */ 72b3c9d1c33caf325aada244204215eb790c228c12dandov SkPoint next() { 73b3c9d1c33caf325aada244204215eb790c228c12dandov SkPoint point = fFwDiff[0]; 74b3c9d1c33caf325aada244204215eb790c228c12dandov fFwDiff[0] += fFwDiff[1]; 75b3c9d1c33caf325aada244204215eb790c228c12dandov fFwDiff[1] += fFwDiff[2]; 76b3c9d1c33caf325aada244204215eb790c228c12dandov fFwDiff[2] += fFwDiff[3]; 77b3c9d1c33caf325aada244204215eb790c228c12dandov fCurrent++; 78b3c9d1c33caf325aada244204215eb790c228c12dandov return point; 79b3c9d1c33caf325aada244204215eb790c228c12dandov } 809d524f22bfde5dc3dc8f48e1be39bdebd3bb0304halcanary 81b3c9d1c33caf325aada244204215eb790c228c12dandov const SkPoint* getCtrlPoints() const { 82b3c9d1c33caf325aada244204215eb790c228c12dandov return fPoints; 83b3c9d1c33caf325aada244204215eb790c228c12dandov } 849d524f22bfde5dc3dc8f48e1be39bdebd3bb0304halcanary 85b3c9d1c33caf325aada244204215eb790c228c12dandovprivate: 865ba2b9612ae4bc3a244bf45f1ec55c3a5a41e181caryclark SkCubicCoeff fCoefs; 87b3c9d1c33caf325aada244204215eb790c228c12dandov int fMax, fCurrent, fDivisions; 885ba2b9612ae4bc3a244bf45f1ec55c3a5a41e181caryclark SkPoint fFwDiff[4], fPoints[4]; 89b3c9d1c33caf325aada244204215eb790c228c12dandov}; 90b3c9d1c33caf325aada244204215eb790c228c12dandov 91b3c9d1c33caf325aada244204215eb790c228c12dandov//////////////////////////////////////////////////////////////////////////////// 92b3c9d1c33caf325aada244204215eb790c228c12dandov 93ecfff21bde1f0ca3c36533eded325066b5f2d42ddandov// size in pixels of each partition per axis, adjust this knob 94b3c9d1c33caf325aada244204215eb790c228c12dandovstatic const int kPartitionSize = 10; 95ecfff21bde1f0ca3c36533eded325066b5f2d42ddandov 96ecfff21bde1f0ca3c36533eded325066b5f2d42ddandov/** 97ecfff21bde1f0ca3c36533eded325066b5f2d42ddandov * Calculate the approximate arc length given a bezier curve's control points. 98ecfff21bde1f0ca3c36533eded325066b5f2d42ddandov */ 99ecfff21bde1f0ca3c36533eded325066b5f2d42ddandovstatic SkScalar approx_arc_length(SkPoint* points, int count) { 100ecfff21bde1f0ca3c36533eded325066b5f2d42ddandov if (count < 2) { 101ecfff21bde1f0ca3c36533eded325066b5f2d42ddandov return 0; 102ecfff21bde1f0ca3c36533eded325066b5f2d42ddandov } 103ecfff21bde1f0ca3c36533eded325066b5f2d42ddandov SkScalar arcLength = 0; 104ecfff21bde1f0ca3c36533eded325066b5f2d42ddandov for (int i = 0; i < count - 1; i++) { 105ecfff21bde1f0ca3c36533eded325066b5f2d42ddandov arcLength += SkPoint::Distance(points[i], points[i + 1]); 106ecfff21bde1f0ca3c36533eded325066b5f2d42ddandov } 107ecfff21bde1f0ca3c36533eded325066b5f2d42ddandov return arcLength; 108ecfff21bde1f0ca3c36533eded325066b5f2d42ddandov} 109ecfff21bde1f0ca3c36533eded325066b5f2d42ddandov 110b3c9d1c33caf325aada244204215eb790c228c12dandovstatic SkScalar bilerp(SkScalar tx, SkScalar ty, SkScalar c00, SkScalar c10, SkScalar c01, 111b3c9d1c33caf325aada244204215eb790c228c12dandov SkScalar c11) { 112b3c9d1c33caf325aada244204215eb790c228c12dandov SkScalar a = c00 * (1.f - tx) + c10 * tx; 113b3c9d1c33caf325aada244204215eb790c228c12dandov SkScalar b = c01 * (1.f - tx) + c11 * tx; 114b3c9d1c33caf325aada244204215eb790c228c12dandov return a * (1.f - ty) + b * ty; 115b3c9d1c33caf325aada244204215eb790c228c12dandov} 116b3c9d1c33caf325aada244204215eb790c228c12dandov 117b3c9d1c33caf325aada244204215eb790c228c12dandovSkISize SkPatchUtils::GetLevelOfDetail(const SkPoint cubics[12], const SkMatrix* matrix) { 1189d524f22bfde5dc3dc8f48e1be39bdebd3bb0304halcanary 119ecfff21bde1f0ca3c36533eded325066b5f2d42ddandov // Approximate length of each cubic. 120b3c9d1c33caf325aada244204215eb790c228c12dandov SkPoint pts[kNumPtsCubic]; 121b3c9d1c33caf325aada244204215eb790c228c12dandov SkPatchUtils::getTopCubic(cubics, pts); 122b3c9d1c33caf325aada244204215eb790c228c12dandov matrix->mapPoints(pts, kNumPtsCubic); 123b3c9d1c33caf325aada244204215eb790c228c12dandov SkScalar topLength = approx_arc_length(pts, kNumPtsCubic); 1249d524f22bfde5dc3dc8f48e1be39bdebd3bb0304halcanary 125b3c9d1c33caf325aada244204215eb790c228c12dandov SkPatchUtils::getBottomCubic(cubics, pts); 126b3c9d1c33caf325aada244204215eb790c228c12dandov matrix->mapPoints(pts, kNumPtsCubic); 127b3c9d1c33caf325aada244204215eb790c228c12dandov SkScalar bottomLength = approx_arc_length(pts, kNumPtsCubic); 1289d524f22bfde5dc3dc8f48e1be39bdebd3bb0304halcanary 129b3c9d1c33caf325aada244204215eb790c228c12dandov SkPatchUtils::getLeftCubic(cubics, pts); 130b3c9d1c33caf325aada244204215eb790c228c12dandov matrix->mapPoints(pts, kNumPtsCubic); 131b3c9d1c33caf325aada244204215eb790c228c12dandov SkScalar leftLength = approx_arc_length(pts, kNumPtsCubic); 1329d524f22bfde5dc3dc8f48e1be39bdebd3bb0304halcanary 133b3c9d1c33caf325aada244204215eb790c228c12dandov SkPatchUtils::getRightCubic(cubics, pts); 134b3c9d1c33caf325aada244204215eb790c228c12dandov matrix->mapPoints(pts, kNumPtsCubic); 135b3c9d1c33caf325aada244204215eb790c228c12dandov SkScalar rightLength = approx_arc_length(pts, kNumPtsCubic); 1369d524f22bfde5dc3dc8f48e1be39bdebd3bb0304halcanary 137ecfff21bde1f0ca3c36533eded325066b5f2d42ddandov // Level of detail per axis, based on the larger side between top and bottom or left and right 138ecfff21bde1f0ca3c36533eded325066b5f2d42ddandov int lodX = static_cast<int>(SkMaxScalar(topLength, bottomLength) / kPartitionSize); 139ecfff21bde1f0ca3c36533eded325066b5f2d42ddandov int lodY = static_cast<int>(SkMaxScalar(leftLength, rightLength) / kPartitionSize); 1409d524f22bfde5dc3dc8f48e1be39bdebd3bb0304halcanary 141b3c9d1c33caf325aada244204215eb790c228c12dandov return SkISize::Make(SkMax32(8, lodX), SkMax32(8, lodY)); 142b3c9d1c33caf325aada244204215eb790c228c12dandov} 143b3c9d1c33caf325aada244204215eb790c228c12dandov 144b3c9d1c33caf325aada244204215eb790c228c12dandovvoid SkPatchUtils::getTopCubic(const SkPoint cubics[12], SkPoint points[4]) { 145b3c9d1c33caf325aada244204215eb790c228c12dandov points[0] = cubics[kTopP0_CubicCtrlPts]; 146b3c9d1c33caf325aada244204215eb790c228c12dandov points[1] = cubics[kTopP1_CubicCtrlPts]; 147b3c9d1c33caf325aada244204215eb790c228c12dandov points[2] = cubics[kTopP2_CubicCtrlPts]; 148b3c9d1c33caf325aada244204215eb790c228c12dandov points[3] = cubics[kTopP3_CubicCtrlPts]; 149b3c9d1c33caf325aada244204215eb790c228c12dandov} 150b3c9d1c33caf325aada244204215eb790c228c12dandov 151b3c9d1c33caf325aada244204215eb790c228c12dandovvoid SkPatchUtils::getBottomCubic(const SkPoint cubics[12], SkPoint points[4]) { 152b3c9d1c33caf325aada244204215eb790c228c12dandov points[0] = cubics[kBottomP0_CubicCtrlPts]; 153b3c9d1c33caf325aada244204215eb790c228c12dandov points[1] = cubics[kBottomP1_CubicCtrlPts]; 154b3c9d1c33caf325aada244204215eb790c228c12dandov points[2] = cubics[kBottomP2_CubicCtrlPts]; 155b3c9d1c33caf325aada244204215eb790c228c12dandov points[3] = cubics[kBottomP3_CubicCtrlPts]; 156b3c9d1c33caf325aada244204215eb790c228c12dandov} 157b3c9d1c33caf325aada244204215eb790c228c12dandov 158b3c9d1c33caf325aada244204215eb790c228c12dandovvoid SkPatchUtils::getLeftCubic(const SkPoint cubics[12], SkPoint points[4]) { 159b3c9d1c33caf325aada244204215eb790c228c12dandov points[0] = cubics[kLeftP0_CubicCtrlPts]; 160b3c9d1c33caf325aada244204215eb790c228c12dandov points[1] = cubics[kLeftP1_CubicCtrlPts]; 161b3c9d1c33caf325aada244204215eb790c228c12dandov points[2] = cubics[kLeftP2_CubicCtrlPts]; 162b3c9d1c33caf325aada244204215eb790c228c12dandov points[3] = cubics[kLeftP3_CubicCtrlPts]; 163b3c9d1c33caf325aada244204215eb790c228c12dandov} 164b3c9d1c33caf325aada244204215eb790c228c12dandov 165b3c9d1c33caf325aada244204215eb790c228c12dandovvoid SkPatchUtils::getRightCubic(const SkPoint cubics[12], SkPoint points[4]) { 166b3c9d1c33caf325aada244204215eb790c228c12dandov points[0] = cubics[kRightP0_CubicCtrlPts]; 167b3c9d1c33caf325aada244204215eb790c228c12dandov points[1] = cubics[kRightP1_CubicCtrlPts]; 168b3c9d1c33caf325aada244204215eb790c228c12dandov points[2] = cubics[kRightP2_CubicCtrlPts]; 169b3c9d1c33caf325aada244204215eb790c228c12dandov points[3] = cubics[kRightP3_CubicCtrlPts]; 170b3c9d1c33caf325aada244204215eb790c228c12dandov} 171b3c9d1c33caf325aada244204215eb790c228c12dandov 172b3c9d1c33caf325aada244204215eb790c228c12dandovbool SkPatchUtils::getVertexData(SkPatchUtils::VertexData* data, const SkPoint cubics[12], 173b3c9d1c33caf325aada244204215eb790c228c12dandov const SkColor colors[4], const SkPoint texCoords[4], int lodX, int lodY) { 17496fcdcc219d2a0d3579719b84b28bede76efba64halcanary if (lodX < 1 || lodY < 1 || nullptr == cubics || nullptr == data) { 175b3c9d1c33caf325aada244204215eb790c228c12dandov return false; 176b3c9d1c33caf325aada244204215eb790c228c12dandov } 17745f7842de7148a544008483a7829071d3dffba51dandov 17845f7842de7148a544008483a7829071d3dffba51dandov // check for overflow in multiplication 17945f7842de7148a544008483a7829071d3dffba51dandov const int64_t lodX64 = (lodX + 1), 18045f7842de7148a544008483a7829071d3dffba51dandov lodY64 = (lodY + 1), 18145f7842de7148a544008483a7829071d3dffba51dandov mult64 = lodX64 * lodY64; 18245f7842de7148a544008483a7829071d3dffba51dandov if (mult64 > SK_MaxS32) { 18345f7842de7148a544008483a7829071d3dffba51dandov return false; 18445f7842de7148a544008483a7829071d3dffba51dandov } 18545f7842de7148a544008483a7829071d3dffba51dandov data->fVertexCount = SkToS32(mult64); 18645f7842de7148a544008483a7829071d3dffba51dandov 18745f7842de7148a544008483a7829071d3dffba51dandov // it is recommended to generate draw calls of no more than 65536 indices, so we never generate 18845f7842de7148a544008483a7829071d3dffba51dandov // more than 60000 indices. To accomplish that we resize the LOD and vertex count 18945f7842de7148a544008483a7829071d3dffba51dandov if (data->fVertexCount > 10000 || lodX > 200 || lodY > 200) { 19045f7842de7148a544008483a7829071d3dffba51dandov SkScalar weightX = static_cast<SkScalar>(lodX) / (lodX + lodY); 19145f7842de7148a544008483a7829071d3dffba51dandov SkScalar weightY = static_cast<SkScalar>(lodY) / (lodX + lodY); 19245f7842de7148a544008483a7829071d3dffba51dandov 19345f7842de7148a544008483a7829071d3dffba51dandov // 200 comes from the 100 * 2 which is the max value of vertices because of the limit of 19445f7842de7148a544008483a7829071d3dffba51dandov // 60000 indices ( sqrt(60000 / 6) that comes from data->fIndexCount = lodX * lodY * 6) 19545f7842de7148a544008483a7829071d3dffba51dandov lodX = static_cast<int>(weightX * 200); 19645f7842de7148a544008483a7829071d3dffba51dandov lodY = static_cast<int>(weightY * 200); 19745f7842de7148a544008483a7829071d3dffba51dandov data->fVertexCount = (lodX + 1) * (lodY + 1); 19845f7842de7148a544008483a7829071d3dffba51dandov } 199b3c9d1c33caf325aada244204215eb790c228c12dandov data->fIndexCount = lodX * lodY * 6; 200385fe4d4b62d7d1dd76116dd570df3290a2f487bhalcanary 201385fe4d4b62d7d1dd76116dd570df3290a2f487bhalcanary data->fPoints = new SkPoint[data->fVertexCount]; 202385fe4d4b62d7d1dd76116dd570df3290a2f487bhalcanary data->fIndices = new uint16_t[data->fIndexCount]; 203385fe4d4b62d7d1dd76116dd570df3290a2f487bhalcanary 204b3c9d1c33caf325aada244204215eb790c228c12dandov // if colors is not null then create array for colors 205b3c9d1c33caf325aada244204215eb790c228c12dandov SkPMColor colorsPM[kNumCorners]; 20649f085dddff10473b6ebf832a974288300224e60bsalomon if (colors) { 207b3c9d1c33caf325aada244204215eb790c228c12dandov // premultiply colors to avoid color bleeding. 208b3c9d1c33caf325aada244204215eb790c228c12dandov for (int i = 0; i < kNumCorners; i++) { 209b3c9d1c33caf325aada244204215eb790c228c12dandov colorsPM[i] = SkPreMultiplyColor(colors[i]); 210b3c9d1c33caf325aada244204215eb790c228c12dandov } 211385fe4d4b62d7d1dd76116dd570df3290a2f487bhalcanary data->fColors = new uint32_t[data->fVertexCount]; 212b3c9d1c33caf325aada244204215eb790c228c12dandov } 2139d524f22bfde5dc3dc8f48e1be39bdebd3bb0304halcanary 214b3c9d1c33caf325aada244204215eb790c228c12dandov // if texture coordinates are not null then create array for them 21549f085dddff10473b6ebf832a974288300224e60bsalomon if (texCoords) { 216385fe4d4b62d7d1dd76116dd570df3290a2f487bhalcanary data->fTexCoords = new SkPoint[data->fVertexCount]; 217b3c9d1c33caf325aada244204215eb790c228c12dandov } 2189d524f22bfde5dc3dc8f48e1be39bdebd3bb0304halcanary 219b3c9d1c33caf325aada244204215eb790c228c12dandov SkPoint pts[kNumPtsCubic]; 220b3c9d1c33caf325aada244204215eb790c228c12dandov SkPatchUtils::getBottomCubic(cubics, pts); 221b3c9d1c33caf325aada244204215eb790c228c12dandov FwDCubicEvaluator fBottom(pts); 222b3c9d1c33caf325aada244204215eb790c228c12dandov SkPatchUtils::getTopCubic(cubics, pts); 223b3c9d1c33caf325aada244204215eb790c228c12dandov FwDCubicEvaluator fTop(pts); 224b3c9d1c33caf325aada244204215eb790c228c12dandov SkPatchUtils::getLeftCubic(cubics, pts); 225b3c9d1c33caf325aada244204215eb790c228c12dandov FwDCubicEvaluator fLeft(pts); 226b3c9d1c33caf325aada244204215eb790c228c12dandov SkPatchUtils::getRightCubic(cubics, pts); 227b3c9d1c33caf325aada244204215eb790c228c12dandov FwDCubicEvaluator fRight(pts); 2289d524f22bfde5dc3dc8f48e1be39bdebd3bb0304halcanary 229b3c9d1c33caf325aada244204215eb790c228c12dandov fBottom.restart(lodX); 230b3c9d1c33caf325aada244204215eb790c228c12dandov fTop.restart(lodX); 2319d524f22bfde5dc3dc8f48e1be39bdebd3bb0304halcanary 232b3c9d1c33caf325aada244204215eb790c228c12dandov SkScalar u = 0.0f; 233b3c9d1c33caf325aada244204215eb790c228c12dandov int stride = lodY + 1; 234b3c9d1c33caf325aada244204215eb790c228c12dandov for (int x = 0; x <= lodX; x++) { 235b3c9d1c33caf325aada244204215eb790c228c12dandov SkPoint bottom = fBottom.next(), top = fTop.next(); 236b3c9d1c33caf325aada244204215eb790c228c12dandov fLeft.restart(lodY); 237b3c9d1c33caf325aada244204215eb790c228c12dandov fRight.restart(lodY); 238b3c9d1c33caf325aada244204215eb790c228c12dandov SkScalar v = 0.f; 239b3c9d1c33caf325aada244204215eb790c228c12dandov for (int y = 0; y <= lodY; y++) { 240b3c9d1c33caf325aada244204215eb790c228c12dandov int dataIndex = x * (lodY + 1) + y; 2419d524f22bfde5dc3dc8f48e1be39bdebd3bb0304halcanary 242b3c9d1c33caf325aada244204215eb790c228c12dandov SkPoint left = fLeft.next(), right = fRight.next(); 2439d524f22bfde5dc3dc8f48e1be39bdebd3bb0304halcanary 244b3c9d1c33caf325aada244204215eb790c228c12dandov SkPoint s0 = SkPoint::Make((1.0f - v) * top.x() + v * bottom.x(), 245b3c9d1c33caf325aada244204215eb790c228c12dandov (1.0f - v) * top.y() + v * bottom.y()); 246b3c9d1c33caf325aada244204215eb790c228c12dandov SkPoint s1 = SkPoint::Make((1.0f - u) * left.x() + u * right.x(), 247b3c9d1c33caf325aada244204215eb790c228c12dandov (1.0f - u) * left.y() + u * right.y()); 248b3c9d1c33caf325aada244204215eb790c228c12dandov SkPoint s2 = SkPoint::Make( 249b3c9d1c33caf325aada244204215eb790c228c12dandov (1.0f - v) * ((1.0f - u) * fTop.getCtrlPoints()[0].x() 250b3c9d1c33caf325aada244204215eb790c228c12dandov + u * fTop.getCtrlPoints()[3].x()) 251b3c9d1c33caf325aada244204215eb790c228c12dandov + v * ((1.0f - u) * fBottom.getCtrlPoints()[0].x() 252b3c9d1c33caf325aada244204215eb790c228c12dandov + u * fBottom.getCtrlPoints()[3].x()), 253b3c9d1c33caf325aada244204215eb790c228c12dandov (1.0f - v) * ((1.0f - u) * fTop.getCtrlPoints()[0].y() 254b3c9d1c33caf325aada244204215eb790c228c12dandov + u * fTop.getCtrlPoints()[3].y()) 255b3c9d1c33caf325aada244204215eb790c228c12dandov + v * ((1.0f - u) * fBottom.getCtrlPoints()[0].y() 256b3c9d1c33caf325aada244204215eb790c228c12dandov + u * fBottom.getCtrlPoints()[3].y())); 257b3c9d1c33caf325aada244204215eb790c228c12dandov data->fPoints[dataIndex] = s0 + s1 - s2; 2589d524f22bfde5dc3dc8f48e1be39bdebd3bb0304halcanary 25949f085dddff10473b6ebf832a974288300224e60bsalomon if (colors) { 260b3c9d1c33caf325aada244204215eb790c228c12dandov uint8_t a = uint8_t(bilerp(u, v, 261b3c9d1c33caf325aada244204215eb790c228c12dandov SkScalar(SkColorGetA(colorsPM[kTopLeft_Corner])), 262b3c9d1c33caf325aada244204215eb790c228c12dandov SkScalar(SkColorGetA(colorsPM[kTopRight_Corner])), 263b3c9d1c33caf325aada244204215eb790c228c12dandov SkScalar(SkColorGetA(colorsPM[kBottomLeft_Corner])), 264b3c9d1c33caf325aada244204215eb790c228c12dandov SkScalar(SkColorGetA(colorsPM[kBottomRight_Corner])))); 265b3c9d1c33caf325aada244204215eb790c228c12dandov uint8_t r = uint8_t(bilerp(u, v, 266b3c9d1c33caf325aada244204215eb790c228c12dandov SkScalar(SkColorGetR(colorsPM[kTopLeft_Corner])), 267b3c9d1c33caf325aada244204215eb790c228c12dandov SkScalar(SkColorGetR(colorsPM[kTopRight_Corner])), 268b3c9d1c33caf325aada244204215eb790c228c12dandov SkScalar(SkColorGetR(colorsPM[kBottomLeft_Corner])), 269b3c9d1c33caf325aada244204215eb790c228c12dandov SkScalar(SkColorGetR(colorsPM[kBottomRight_Corner])))); 270b3c9d1c33caf325aada244204215eb790c228c12dandov uint8_t g = uint8_t(bilerp(u, v, 271b3c9d1c33caf325aada244204215eb790c228c12dandov SkScalar(SkColorGetG(colorsPM[kTopLeft_Corner])), 272b3c9d1c33caf325aada244204215eb790c228c12dandov SkScalar(SkColorGetG(colorsPM[kTopRight_Corner])), 273b3c9d1c33caf325aada244204215eb790c228c12dandov SkScalar(SkColorGetG(colorsPM[kBottomLeft_Corner])), 274b3c9d1c33caf325aada244204215eb790c228c12dandov SkScalar(SkColorGetG(colorsPM[kBottomRight_Corner])))); 275b3c9d1c33caf325aada244204215eb790c228c12dandov uint8_t b = uint8_t(bilerp(u, v, 276b3c9d1c33caf325aada244204215eb790c228c12dandov SkScalar(SkColorGetB(colorsPM[kTopLeft_Corner])), 277b3c9d1c33caf325aada244204215eb790c228c12dandov SkScalar(SkColorGetB(colorsPM[kTopRight_Corner])), 278b3c9d1c33caf325aada244204215eb790c228c12dandov SkScalar(SkColorGetB(colorsPM[kBottomLeft_Corner])), 279b3c9d1c33caf325aada244204215eb790c228c12dandov SkScalar(SkColorGetB(colorsPM[kBottomRight_Corner])))); 280b3c9d1c33caf325aada244204215eb790c228c12dandov data->fColors[dataIndex] = SkPackARGB32(a,r,g,b); 281b3c9d1c33caf325aada244204215eb790c228c12dandov } 2829d524f22bfde5dc3dc8f48e1be39bdebd3bb0304halcanary 28349f085dddff10473b6ebf832a974288300224e60bsalomon if (texCoords) { 284b3c9d1c33caf325aada244204215eb790c228c12dandov data->fTexCoords[dataIndex] = SkPoint::Make( 285b3c9d1c33caf325aada244204215eb790c228c12dandov bilerp(u, v, texCoords[kTopLeft_Corner].x(), 286b3c9d1c33caf325aada244204215eb790c228c12dandov texCoords[kTopRight_Corner].x(), 287b3c9d1c33caf325aada244204215eb790c228c12dandov texCoords[kBottomLeft_Corner].x(), 288b3c9d1c33caf325aada244204215eb790c228c12dandov texCoords[kBottomRight_Corner].x()), 289b3c9d1c33caf325aada244204215eb790c228c12dandov bilerp(u, v, texCoords[kTopLeft_Corner].y(), 290b3c9d1c33caf325aada244204215eb790c228c12dandov texCoords[kTopRight_Corner].y(), 291b3c9d1c33caf325aada244204215eb790c228c12dandov texCoords[kBottomLeft_Corner].y(), 292b3c9d1c33caf325aada244204215eb790c228c12dandov texCoords[kBottomRight_Corner].y())); 2939d524f22bfde5dc3dc8f48e1be39bdebd3bb0304halcanary 294b3c9d1c33caf325aada244204215eb790c228c12dandov } 2959d524f22bfde5dc3dc8f48e1be39bdebd3bb0304halcanary 296b3c9d1c33caf325aada244204215eb790c228c12dandov if(x < lodX && y < lodY) { 297b3c9d1c33caf325aada244204215eb790c228c12dandov int i = 6 * (x * lodY + y); 298b3c9d1c33caf325aada244204215eb790c228c12dandov data->fIndices[i] = x * stride + y; 299b3c9d1c33caf325aada244204215eb790c228c12dandov data->fIndices[i + 1] = x * stride + 1 + y; 300b3c9d1c33caf325aada244204215eb790c228c12dandov data->fIndices[i + 2] = (x + 1) * stride + 1 + y; 301b3c9d1c33caf325aada244204215eb790c228c12dandov data->fIndices[i + 3] = data->fIndices[i]; 302b3c9d1c33caf325aada244204215eb790c228c12dandov data->fIndices[i + 4] = data->fIndices[i + 2]; 303b3c9d1c33caf325aada244204215eb790c228c12dandov data->fIndices[i + 5] = (x + 1) * stride + y; 304b3c9d1c33caf325aada244204215eb790c228c12dandov } 305b3c9d1c33caf325aada244204215eb790c228c12dandov v = SkScalarClampMax(v + 1.f / lodY, 1); 306b3c9d1c33caf325aada244204215eb790c228c12dandov } 307b3c9d1c33caf325aada244204215eb790c228c12dandov u = SkScalarClampMax(u + 1.f / lodX, 1); 308b3c9d1c33caf325aada244204215eb790c228c12dandov } 309b3c9d1c33caf325aada244204215eb790c228c12dandov return true; 310b3c9d1c33caf325aada244204215eb790c228c12dandov 311ecfff21bde1f0ca3c36533eded325066b5f2d42ddandov} 312795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed 313795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed/////////////////////////////////////////////////////////////////////////////////////////////////// 314795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed 315795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reedsk_sp<SkVertices> SkPatchUtils::MakeVertices(const SkPoint cubics[12], const SkColor srcColors[4], 316795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed const SkPoint srcTexCoords[4], int lodX, int lodY) { 317795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed if (lodX < 1 || lodY < 1 || nullptr == cubics) { 318795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed return nullptr; 319795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed } 320795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed 321795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed // check for overflow in multiplication 322795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed const int64_t lodX64 = (lodX + 1), 323795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed lodY64 = (lodY + 1), 324795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed mult64 = lodX64 * lodY64; 325795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed if (mult64 > SK_MaxS32) { 326795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed return nullptr; 327795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed } 328795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed 329795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed int vertexCount = SkToS32(mult64); 330795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed // it is recommended to generate draw calls of no more than 65536 indices, so we never generate 331795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed // more than 60000 indices. To accomplish that we resize the LOD and vertex count 332795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed if (vertexCount > 10000 || lodX > 200 || lodY > 200) { 333795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed float weightX = static_cast<float>(lodX) / (lodX + lodY); 334795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed float weightY = static_cast<float>(lodY) / (lodX + lodY); 335795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed 336795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed // 200 comes from the 100 * 2 which is the max value of vertices because of the limit of 337795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed // 60000 indices ( sqrt(60000 / 6) that comes from data->fIndexCount = lodX * lodY * 6) 338795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed lodX = static_cast<int>(weightX * 200); 339795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed lodY = static_cast<int>(weightY * 200); 340795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed vertexCount = (lodX + 1) * (lodY + 1); 341795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed } 342795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed const int indexCount = lodX * lodY * 6; 343795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed uint32_t flags = 0; 344795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed if (srcTexCoords) { 345795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed flags |= SkVertices::kHasTexCoords_BuilderFlag; 346795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed } 347795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed if (srcColors) { 348795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed flags |= SkVertices::kHasColors_BuilderFlag; 349795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed } 350795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed 351795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed SkVertices::Builder builder(SkCanvas::kTriangles_VertexMode, vertexCount, indexCount, flags); 352795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed SkPoint* pos = builder.positions(); 353795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed SkPoint* texs = builder.texCoords(); 354795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed SkColor* colors = builder.colors(); 355795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed uint16_t* indices = builder.indices(); 356795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed 357795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed // if colors is not null then create array for colors 358795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed SkPMColor colorsPM[kNumCorners]; 359795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed if (srcColors) { 360795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed // premultiply colors to avoid color bleeding. 361795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed for (int i = 0; i < kNumCorners; i++) { 362795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed colorsPM[i] = SkPreMultiplyColor(srcColors[i]); 363795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed } 364795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed srcColors = colorsPM; 365795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed } 366795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed 367795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed SkPoint pts[kNumPtsCubic]; 368795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed SkPatchUtils::getBottomCubic(cubics, pts); 369795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed FwDCubicEvaluator fBottom(pts); 370795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed SkPatchUtils::getTopCubic(cubics, pts); 371795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed FwDCubicEvaluator fTop(pts); 372795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed SkPatchUtils::getLeftCubic(cubics, pts); 373795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed FwDCubicEvaluator fLeft(pts); 374795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed SkPatchUtils::getRightCubic(cubics, pts); 375795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed FwDCubicEvaluator fRight(pts); 376795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed 377795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed fBottom.restart(lodX); 378795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed fTop.restart(lodX); 379795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed 380795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed SkScalar u = 0.0f; 381795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed int stride = lodY + 1; 382795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed for (int x = 0; x <= lodX; x++) { 383795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed SkPoint bottom = fBottom.next(), top = fTop.next(); 384795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed fLeft.restart(lodY); 385795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed fRight.restart(lodY); 386795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed SkScalar v = 0.f; 387795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed for (int y = 0; y <= lodY; y++) { 388795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed int dataIndex = x * (lodY + 1) + y; 389795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed 390795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed SkPoint left = fLeft.next(), right = fRight.next(); 391795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed 392795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed SkPoint s0 = SkPoint::Make((1.0f - v) * top.x() + v * bottom.x(), 393795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed (1.0f - v) * top.y() + v * bottom.y()); 394795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed SkPoint s1 = SkPoint::Make((1.0f - u) * left.x() + u * right.x(), 395795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed (1.0f - u) * left.y() + u * right.y()); 396795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed SkPoint s2 = SkPoint::Make( 397795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed (1.0f - v) * ((1.0f - u) * fTop.getCtrlPoints()[0].x() 398795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed + u * fTop.getCtrlPoints()[3].x()) 399795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed + v * ((1.0f - u) * fBottom.getCtrlPoints()[0].x() 400795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed + u * fBottom.getCtrlPoints()[3].x()), 401795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed (1.0f - v) * ((1.0f - u) * fTop.getCtrlPoints()[0].y() 402795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed + u * fTop.getCtrlPoints()[3].y()) 403795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed + v * ((1.0f - u) * fBottom.getCtrlPoints()[0].y() 404795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed + u * fBottom.getCtrlPoints()[3].y())); 405795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed pos[dataIndex] = s0 + s1 - s2; 406795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed 407795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed if (colors) { 408795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed uint8_t a = uint8_t(bilerp(u, v, 409795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed SkScalar(SkColorGetA(colorsPM[kTopLeft_Corner])), 410795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed SkScalar(SkColorGetA(colorsPM[kTopRight_Corner])), 411795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed SkScalar(SkColorGetA(colorsPM[kBottomLeft_Corner])), 412795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed SkScalar(SkColorGetA(colorsPM[kBottomRight_Corner])))); 413795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed uint8_t r = uint8_t(bilerp(u, v, 414795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed SkScalar(SkColorGetR(colorsPM[kTopLeft_Corner])), 415795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed SkScalar(SkColorGetR(colorsPM[kTopRight_Corner])), 416795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed SkScalar(SkColorGetR(colorsPM[kBottomLeft_Corner])), 417795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed SkScalar(SkColorGetR(colorsPM[kBottomRight_Corner])))); 418795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed uint8_t g = uint8_t(bilerp(u, v, 419795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed SkScalar(SkColorGetG(colorsPM[kTopLeft_Corner])), 420795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed SkScalar(SkColorGetG(colorsPM[kTopRight_Corner])), 421795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed SkScalar(SkColorGetG(colorsPM[kBottomLeft_Corner])), 422795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed SkScalar(SkColorGetG(colorsPM[kBottomRight_Corner])))); 423795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed uint8_t b = uint8_t(bilerp(u, v, 424795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed SkScalar(SkColorGetB(colorsPM[kTopLeft_Corner])), 425795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed SkScalar(SkColorGetB(colorsPM[kTopRight_Corner])), 426795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed SkScalar(SkColorGetB(colorsPM[kBottomLeft_Corner])), 427795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed SkScalar(SkColorGetB(colorsPM[kBottomRight_Corner])))); 428795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed colors[dataIndex] = SkPackARGB32(a,r,g,b); 429795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed } 430795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed 431795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed if (texs) { 432795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed texs[dataIndex] = SkPoint::Make(bilerp(u, v, srcTexCoords[kTopLeft_Corner].x(), 433795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed srcTexCoords[kTopRight_Corner].x(), 434795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed srcTexCoords[kBottomLeft_Corner].x(), 435795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed srcTexCoords[kBottomRight_Corner].x()), 436795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed bilerp(u, v, srcTexCoords[kTopLeft_Corner].y(), 437795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed srcTexCoords[kTopRight_Corner].y(), 438795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed srcTexCoords[kBottomLeft_Corner].y(), 439795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed srcTexCoords[kBottomRight_Corner].y())); 440795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed 441795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed } 442795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed 443795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed if(x < lodX && y < lodY) { 444795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed int i = 6 * (x * lodY + y); 445795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed indices[i] = x * stride + y; 446795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed indices[i + 1] = x * stride + 1 + y; 447795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed indices[i + 2] = (x + 1) * stride + 1 + y; 448795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed indices[i + 3] = indices[i]; 449795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed indices[i + 4] = indices[i + 2]; 450795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed indices[i + 5] = (x + 1) * stride + y; 451795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed } 452795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed v = SkScalarClampMax(v + 1.f / lodY, 1); 453795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed } 454795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed u = SkScalarClampMax(u + 1.f / lodX, 1); 455795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed } 456795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed return builder.detach(); 457795c5ea6572ca8b58961ed64d628cc407005f1b3Mike Reed} 458