1fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot/* 2fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot * Copyright 2018 Google Inc. 3fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot * 4fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot * Use of this source code is governed by a BSD-style license that can be 5fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot * found in the LICENSE file. 6fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot */ 7fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot 8fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot/************************************************************************************************** 9fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot *** This file was autogenerated from GrCircleBlurFragmentProcessor.fp; do not modify. 10fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot **************************************************************************************************/ 11fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot#include "GrCircleBlurFragmentProcessor.h" 12fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot#if SK_SUPPORT_GPU 13fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot 14fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot#include "GrProxyProvider.h" 15fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot 16fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot// Computes an unnormalized half kernel (right side). Returns the summation of all the half 17fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot// kernel values. 18fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robotstatic float make_unnormalized_half_kernel(float* halfKernel, int halfKernelSize, float sigma) { 19fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot const float invSigma = 1.f / sigma; 20fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot const float b = -0.5f * invSigma * invSigma; 21fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot float tot = 0.0f; 22fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot // Compute half kernel values at half pixel steps out from the center. 23fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot float t = 0.5f; 24fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot for (int i = 0; i < halfKernelSize; ++i) { 25fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot float value = expf(t * t * b); 26fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot tot += value; 27fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot halfKernel[i] = value; 28fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot t += 1.f; 29fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot } 30fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot return tot; 31fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot} 32fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot 33fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot// Create a Gaussian half-kernel (right side) and a summed area table given a sigma and number 34fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot// of discrete steps. The half kernel is normalized to sum to 0.5. 35fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robotstatic void make_half_kernel_and_summed_table(float* halfKernel, float* summedHalfKernel, 36fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot int halfKernelSize, float sigma) { 37fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot // The half kernel should sum to 0.5 not 1.0. 38fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot const float tot = 2.f * make_unnormalized_half_kernel(halfKernel, halfKernelSize, sigma); 39fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot float sum = 0.f; 40fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot for (int i = 0; i < halfKernelSize; ++i) { 41fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot halfKernel[i] /= tot; 42fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot sum += halfKernel[i]; 43fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot summedHalfKernel[i] = sum; 44fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot } 45fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot} 46fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot 47fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot// Applies the 1D half kernel vertically at points along the x axis to a circle centered at the 48fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot// origin with radius circleR. 49fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robotvoid apply_kernel_in_y(float* results, int numSteps, float firstX, float circleR, 50fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot int halfKernelSize, const float* summedHalfKernelTable) { 51fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot float x = firstX; 52fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot for (int i = 0; i < numSteps; ++i, x += 1.f) { 53fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot if (x < -circleR || x > circleR) { 54fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot results[i] = 0; 55fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot continue; 56fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot } 57fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot float y = sqrtf(circleR * circleR - x * x); 58fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot // In the column at x we exit the circle at +y and -y 59fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot // The summed table entry j is actually reflects an offset of j + 0.5. 60fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot y -= 0.5f; 61fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot int yInt = SkScalarFloorToInt(y); 62fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot SkASSERT(yInt >= -1); 63fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot if (y < 0) { 64fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot results[i] = (y + 0.5f) * summedHalfKernelTable[0]; 65fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot } else if (yInt >= halfKernelSize - 1) { 66fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot results[i] = 0.5f; 67fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot } else { 68fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot float yFrac = y - yInt; 69fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot results[i] = (1.f - yFrac) * summedHalfKernelTable[yInt] + 70fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot yFrac * summedHalfKernelTable[yInt + 1]; 71fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot } 72fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot } 73fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot} 74fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot 75fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot// Apply a Gaussian at point (evalX, 0) to a circle centered at the origin with radius circleR. 76fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot// This relies on having a half kernel computed for the Gaussian and a table of applications of 77fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot// the half kernel in y to columns at (evalX - halfKernel, evalX - halfKernel + 1, ..., evalX + 78fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot// halfKernel) passed in as yKernelEvaluations. 79fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robotstatic uint8_t eval_at(float evalX, float circleR, const float* halfKernel, int halfKernelSize, 80fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot const float* yKernelEvaluations) { 81fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot float acc = 0; 82fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot 83fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot float x = evalX - halfKernelSize; 84fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot for (int i = 0; i < halfKernelSize; ++i, x += 1.f) { 85fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot if (x < -circleR || x > circleR) { 86fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot continue; 87fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot } 88fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot float verticalEval = yKernelEvaluations[i]; 89fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot acc += verticalEval * halfKernel[halfKernelSize - i - 1]; 90fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot } 91fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot for (int i = 0; i < halfKernelSize; ++i, x += 1.f) { 92fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot if (x < -circleR || x > circleR) { 93fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot continue; 94fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot } 95fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot float verticalEval = yKernelEvaluations[i + halfKernelSize]; 96fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot acc += verticalEval * halfKernel[i]; 97fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot } 98fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot // Since we applied a half kernel in y we multiply acc by 2 (the circle is symmetric about 99fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot // the x axis). 100fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot return SkUnitScalarClampToByte(2.f * acc); 101fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot} 102fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot 103fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot// This function creates a profile of a blurred circle. It does this by computing a kernel for 104fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot// half the Gaussian and a matching summed area table. The summed area table is used to compute 105fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot// an array of vertical applications of the half kernel to the circle along the x axis. The 106fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot// table of y evaluations has 2 * k + n entries where k is the size of the half kernel and n is 107fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot// the size of the profile being computed. Then for each of the n profile entries we walk out k 108fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot// steps in each horizontal direction multiplying the corresponding y evaluation by the half 109fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot// kernel entry and sum these values to compute the profile entry. 110fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robotstatic uint8_t* create_circle_profile(float sigma, float circleR, int profileTextureWidth) { 111fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot const int numSteps = profileTextureWidth; 112fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot uint8_t* weights = new uint8_t[numSteps]; 113fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot 114fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot // The full kernel is 6 sigmas wide. 115fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot int halfKernelSize = SkScalarCeilToInt(6.0f * sigma); 116fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot // round up to next multiple of 2 and then divide by 2 117fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot halfKernelSize = ((halfKernelSize + 1) & ~1) >> 1; 118fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot 119fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot // Number of x steps at which to apply kernel in y to cover all the profile samples in x. 120fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot int numYSteps = numSteps + 2 * halfKernelSize; 121fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot 122fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot SkAutoTArray<float> bulkAlloc(halfKernelSize + halfKernelSize + numYSteps); 123fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot float* halfKernel = bulkAlloc.get(); 124fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot float* summedKernel = bulkAlloc.get() + halfKernelSize; 125fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot float* yEvals = bulkAlloc.get() + 2 * halfKernelSize; 126fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot make_half_kernel_and_summed_table(halfKernel, summedKernel, halfKernelSize, sigma); 127fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot 128fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot float firstX = -halfKernelSize + 0.5f; 129fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot apply_kernel_in_y(yEvals, numYSteps, firstX, circleR, halfKernelSize, summedKernel); 130fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot 131fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot for (int i = 0; i < numSteps - 1; ++i) { 132fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot float evalX = i + 0.5f; 133fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot weights[i] = eval_at(evalX, circleR, halfKernel, halfKernelSize, yEvals + i); 134fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot } 135fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot // Ensure the tail of the Gaussian goes to zero. 136fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot weights[numSteps - 1] = 0; 137fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot return weights; 138fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot} 139fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot 140fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robotstatic uint8_t* create_half_plane_profile(int profileWidth) { 141fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot SkASSERT(!(profileWidth & 0x1)); 142fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot // The full kernel is 6 sigmas wide. 143fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot float sigma = profileWidth / 6.f; 144fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot int halfKernelSize = profileWidth / 2; 145fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot 146fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot SkAutoTArray<float> halfKernel(halfKernelSize); 147fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot uint8_t* profile = new uint8_t[profileWidth]; 148fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot 149fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot // The half kernel should sum to 0.5. 150fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot const float tot = 2.f * make_unnormalized_half_kernel(halfKernel.get(), halfKernelSize, sigma); 151fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot float sum = 0.f; 152fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot // Populate the profile from the right edge to the middle. 153fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot for (int i = 0; i < halfKernelSize; ++i) { 154fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot halfKernel[halfKernelSize - i - 1] /= tot; 155fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot sum += halfKernel[halfKernelSize - i - 1]; 156fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot profile[profileWidth - i - 1] = SkUnitScalarClampToByte(sum); 157fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot } 158fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot // Populate the profile from the middle to the left edge (by flipping the half kernel and 159fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot // continuing the summation). 160fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot for (int i = 0; i < halfKernelSize; ++i) { 161fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot sum += halfKernel[i]; 162fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot profile[halfKernelSize - i - 1] = SkUnitScalarClampToByte(sum); 163fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot } 164fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot // Ensure tail goes to 0. 165fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot profile[profileWidth - 1] = 0; 166fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot return profile; 167fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot} 168fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot 169fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robotstatic sk_sp<GrTextureProxy> create_profile_texture(GrProxyProvider* proxyProvider, 170fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot const SkRect& circle, float sigma, 171fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot float* solidRadius, float* textureRadius) { 172fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot float circleR = circle.width() / 2.0f; 173fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot if (circleR < SK_ScalarNearlyZero) { 174fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot return nullptr; 175fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot } 176fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot // Profile textures are cached by the ratio of sigma to circle radius and by the size of the 177fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot // profile texture (binned by powers of 2). 178fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot SkScalar sigmaToCircleRRatio = sigma / circleR; 179fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot // When sigma is really small this becomes a equivalent to convolving a Gaussian with a 180fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot // half-plane. Similarly, in the extreme high ratio cases circle becomes a point WRT to the 181fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot // Guassian and the profile texture is a just a Gaussian evaluation. However, we haven't yet 182fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot // implemented this latter optimization. 183fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot sigmaToCircleRRatio = SkTMin(sigmaToCircleRRatio, 8.f); 184fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot SkFixed sigmaToCircleRRatioFixed; 185fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot static const SkScalar kHalfPlaneThreshold = 0.1f; 186fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot bool useHalfPlaneApprox = false; 187fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot if (sigmaToCircleRRatio <= kHalfPlaneThreshold) { 188fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot useHalfPlaneApprox = true; 189fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot sigmaToCircleRRatioFixed = 0; 190fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot *solidRadius = circleR - 3 * sigma; 191fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot *textureRadius = 6 * sigma; 192fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot } else { 193fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot // Convert to fixed point for the key. 194fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot sigmaToCircleRRatioFixed = SkScalarToFixed(sigmaToCircleRRatio); 195fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot // We shave off some bits to reduce the number of unique entries. We could probably 196fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot // shave off more than we do. 197fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot sigmaToCircleRRatioFixed &= ~0xff; 198fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot sigmaToCircleRRatio = SkFixedToScalar(sigmaToCircleRRatioFixed); 199fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot sigma = circleR * sigmaToCircleRRatio; 200fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot *solidRadius = 0; 201fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot *textureRadius = circleR + 3 * sigma; 202fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot } 203fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot 204fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot static const GrUniqueKey::Domain kDomain = GrUniqueKey::GenerateDomain(); 205fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot GrUniqueKey key; 206fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot GrUniqueKey::Builder builder(&key, kDomain, 1); 207fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot builder[0] = sigmaToCircleRRatioFixed; 208fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot builder.finish(); 209fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot 210fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot sk_sp<GrTextureProxy> blurProfile = 211fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot proxyProvider->findOrCreateProxyByUniqueKey(key, kTopLeft_GrSurfaceOrigin); 212fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot if (!blurProfile) { 213fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot static constexpr int kProfileTextureWidth = 512; 214fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot GrSurfaceDesc texDesc; 215fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot texDesc.fOrigin = kTopLeft_GrSurfaceOrigin; 216fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot texDesc.fWidth = kProfileTextureWidth; 217fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot texDesc.fHeight = 1; 218fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot texDesc.fConfig = kAlpha_8_GrPixelConfig; 219fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot 220fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot std::unique_ptr<uint8_t[]> profile(nullptr); 221fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot if (useHalfPlaneApprox) { 222fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot profile.reset(create_half_plane_profile(kProfileTextureWidth)); 223fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot } else { 224fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot // Rescale params to the size of the texture we're creating. 225fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot SkScalar scale = kProfileTextureWidth / *textureRadius; 226fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot profile.reset( 227fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot create_circle_profile(sigma * scale, circleR * scale, kProfileTextureWidth)); 228fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot } 229fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot 230fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot blurProfile = 231fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot proxyProvider->createTextureProxy(texDesc, SkBudgeted::kYes, profile.get(), 0); 232fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot if (!blurProfile) { 233fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot return nullptr; 234fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot } 235fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot 236fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot SkASSERT(blurProfile->origin() == kTopLeft_GrSurfaceOrigin); 237fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot proxyProvider->assignUniqueKeyToProxy(key, blurProfile.get()); 238fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot } 239fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot 240fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot return blurProfile; 241fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot} 242fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot 243fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robotstd::unique_ptr<GrFragmentProcessor> GrCircleBlurFragmentProcessor::Make( 244fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot GrProxyProvider* proxyProvider, const SkRect& circle, float sigma) { 245fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot float solidRadius; 246fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot float textureRadius; 247fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot sk_sp<GrTextureProxy> profile( 248fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot create_profile_texture(proxyProvider, circle, sigma, &solidRadius, &textureRadius)); 249fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot if (!profile) { 250fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot return nullptr; 251fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot } 252fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot return std::unique_ptr<GrFragmentProcessor>(new GrCircleBlurFragmentProcessor( 253fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot circle, textureRadius, solidRadius, std::move(profile))); 254fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot} 255fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot#include "glsl/GrGLSLFragmentProcessor.h" 256fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot#include "glsl/GrGLSLFragmentShaderBuilder.h" 257fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot#include "glsl/GrGLSLProgramBuilder.h" 258fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot#include "GrTexture.h" 259fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot#include "SkSLCPP.h" 260fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot#include "SkSLUtil.h" 261fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robotclass GrGLSLCircleBlurFragmentProcessor : public GrGLSLFragmentProcessor { 262fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robotpublic: 263fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot GrGLSLCircleBlurFragmentProcessor() {} 264fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot void emitCode(EmitArgs& args) override { 265fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder; 266fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot const GrCircleBlurFragmentProcessor& _outer = 267fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot args.fFp.cast<GrCircleBlurFragmentProcessor>(); 268fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot (void)_outer; 269fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot auto circleRect = _outer.circleRect(); 270fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot (void)circleRect; 271fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot auto textureRadius = _outer.textureRadius(); 272fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot (void)textureRadius; 273fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot auto solidRadius = _outer.solidRadius(); 274fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot (void)solidRadius; 275fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot fCircleDataVar = args.fUniformHandler->addUniform(kFragment_GrShaderFlag, kHalf4_GrSLType, 276fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot kDefault_GrSLPrecision, "circleData"); 277fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot fragBuilder->codeAppendf( 278fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot "half2 vec = half2(half((sk_FragCoord.x - float(%s.x)) * float(%s.w)), " 279fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot "half((sk_FragCoord.y - float(%s.y)) * float(%s.w)));\nhalf dist = " 280fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot "float(length(vec)) + (0.5 - float(%s.z)) * float(%s.w);\n%s = %s * texture(%s, " 281fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot "float2(half2(dist, 0.5))).%s.w;\n", 282fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot args.fUniformHandler->getUniformCStr(fCircleDataVar), 283fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot args.fUniformHandler->getUniformCStr(fCircleDataVar), 284fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot args.fUniformHandler->getUniformCStr(fCircleDataVar), 285fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot args.fUniformHandler->getUniformCStr(fCircleDataVar), 286fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot args.fUniformHandler->getUniformCStr(fCircleDataVar), 287fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot args.fUniformHandler->getUniformCStr(fCircleDataVar), args.fOutputColor, 288fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot args.fInputColor ? args.fInputColor : "half4(1)", 289fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot fragBuilder->getProgramBuilder()->samplerVariable(args.fTexSamplers[0]).c_str(), 290fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot fragBuilder->getProgramBuilder()->samplerSwizzle(args.fTexSamplers[0]).c_str()); 291fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot } 292fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot 293fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robotprivate: 294fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot void onSetData(const GrGLSLProgramDataManager& data, 295fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot const GrFragmentProcessor& _proc) override { 296fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot const GrCircleBlurFragmentProcessor& _outer = _proc.cast<GrCircleBlurFragmentProcessor>(); 297fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot auto circleRect = _outer.circleRect(); 298fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot (void)circleRect; 299fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot auto textureRadius = _outer.textureRadius(); 300fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot (void)textureRadius; 301fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot auto solidRadius = _outer.solidRadius(); 302fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot (void)solidRadius; 303fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot GrSurfaceProxy& blurProfileSamplerProxy = *_outer.textureSampler(0).proxy(); 304fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot GrTexture& blurProfileSampler = *blurProfileSamplerProxy.priv().peekTexture(); 305fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot (void)blurProfileSampler; 306fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot UniformHandle& circleData = fCircleDataVar; 307fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot (void)circleData; 308fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot 309fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot data.set4f(circleData, circleRect.centerX(), circleRect.centerY(), solidRadius, 310fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot 1.f / textureRadius); 311fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot } 312fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot UniformHandle fCircleDataVar; 313fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot}; 314fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team RobotGrGLSLFragmentProcessor* GrCircleBlurFragmentProcessor::onCreateGLSLInstance() const { 315fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot return new GrGLSLCircleBlurFragmentProcessor(); 316fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot} 317fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robotvoid GrCircleBlurFragmentProcessor::onGetGLSLProcessorKey(const GrShaderCaps& caps, 318fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot GrProcessorKeyBuilder* b) const {} 319fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robotbool GrCircleBlurFragmentProcessor::onIsEqual(const GrFragmentProcessor& other) const { 320fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot const GrCircleBlurFragmentProcessor& that = other.cast<GrCircleBlurFragmentProcessor>(); 321fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot (void)that; 322fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot if (fCircleRect != that.fCircleRect) return false; 323fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot if (fTextureRadius != that.fTextureRadius) return false; 324fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot if (fSolidRadius != that.fSolidRadius) return false; 325fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot if (fBlurProfileSampler != that.fBlurProfileSampler) return false; 326fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot return true; 327fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot} 328fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team RobotGrCircleBlurFragmentProcessor::GrCircleBlurFragmentProcessor( 329fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot const GrCircleBlurFragmentProcessor& src) 330fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot : INHERITED(kGrCircleBlurFragmentProcessor_ClassID, src.optimizationFlags()) 331fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot , fCircleRect(src.fCircleRect) 332fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot , fTextureRadius(src.fTextureRadius) 333fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot , fSolidRadius(src.fSolidRadius) 334fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot , fBlurProfileSampler(src.fBlurProfileSampler) { 335fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot this->addTextureSampler(&fBlurProfileSampler); 336fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot} 337fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robotstd::unique_ptr<GrFragmentProcessor> GrCircleBlurFragmentProcessor::clone() const { 338fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot return std::unique_ptr<GrFragmentProcessor>(new GrCircleBlurFragmentProcessor(*this)); 339fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot} 340fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team RobotGR_DEFINE_FRAGMENT_PROCESSOR_TEST(GrCircleBlurFragmentProcessor); 341fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot#if GR_TEST_UTILS 342fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robotstd::unique_ptr<GrFragmentProcessor> GrCircleBlurFragmentProcessor::TestCreate( 343fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot GrProcessorTestData* testData) { 344fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot SkScalar wh = testData->fRandom->nextRangeScalar(100.f, 1000.f); 345fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot SkScalar sigma = testData->fRandom->nextRangeF(1.f, 10.f); 346fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot SkRect circle = SkRect::MakeWH(wh, wh); 347fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot return GrCircleBlurFragmentProcessor::Make(testData->proxyProvider(), circle, sigma); 348fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot} 349fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot#endif 350fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot#endif 351