rileya@google.com | 589708b | 2012-07-26 20:04:23 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2012 Google Inc. |
| 3 | * |
| 4 | * Use of this source code is governed by a BSD-style license that can be |
| 5 | * found in the LICENSE file. |
| 6 | */ |
| 7 | |
Mike Reed | 0b510fb | 2018-05-03 12:50:38 -0400 | [diff] [blame] | 8 | #include "SkFloatingPoint.h" |
Florin Malita | a66ef2d | 2017-06-28 10:02:40 -0400 | [diff] [blame] | 9 | #include "SkRasterPipeline.h" |
Florin Malita | d4e9ec8 | 2017-10-25 18:00:26 -0400 | [diff] [blame] | 10 | #include "SkReadBuffer.h" |
Mike Reed | 0b510fb | 2018-05-03 12:50:38 -0400 | [diff] [blame] | 11 | #include "SkTwoPointConicalGradient.h" |
Florin Malita | d4e9ec8 | 2017-10-25 18:00:26 -0400 | [diff] [blame] | 12 | #include "SkWriteBuffer.h" |
Florin Malita | a66ef2d | 2017-06-28 10:02:40 -0400 | [diff] [blame] | 13 | #include "../../jumper/SkJumper.h" |
| 14 | |
Ben Wagner | f08d1d0 | 2018-06-18 15:11:00 -0400 | [diff] [blame] | 15 | #include <utility> |
| 16 | |
Yuqian Li | d208a88 | 2018-01-04 10:08:42 -0500 | [diff] [blame] | 17 | // Please see https://skia.org/dev/design/conical for how our shader works. |
| 18 | |
Mike Reed | a2f14de | 2018-05-09 14:01:00 -0400 | [diff] [blame] | 19 | bool SkTwoPointConicalGradient::FocalData::set(SkScalar r0, SkScalar r1, SkMatrix* matrix) { |
Yuqian Li | d208a88 | 2018-01-04 10:08:42 -0500 | [diff] [blame] | 20 | fIsSwapped = false; |
Mike Reed | a2f14de | 2018-05-09 14:01:00 -0400 | [diff] [blame] | 21 | fFocalX = sk_ieee_float_divide(r0, (r0 - r1)); |
Yuqian Li | d208a88 | 2018-01-04 10:08:42 -0500 | [diff] [blame] | 22 | if (SkScalarNearlyZero(fFocalX - 1)) { |
| 23 | // swap r0, r1 |
Mike Reed | a2f14de | 2018-05-09 14:01:00 -0400 | [diff] [blame] | 24 | matrix->postTranslate(-1, 0); |
| 25 | matrix->postScale(-1, 1); |
Yuqian Li | d208a88 | 2018-01-04 10:08:42 -0500 | [diff] [blame] | 26 | std::swap(r0, r1); |
| 27 | fFocalX = 0; // because r0 is now 0 |
| 28 | fIsSwapped = true; |
| 29 | } |
| 30 | |
| 31 | // Map {focal point, (1, 0)} to {(0, 0), (1, 0)} |
| 32 | const SkPoint from[2] = { {fFocalX, 0}, {1, 0} }; |
| 33 | const SkPoint to[2] = { {0, 0}, {1, 0} }; |
| 34 | SkMatrix focalMatrix; |
| 35 | if (!focalMatrix.setPolyToPoly(from, to, 2)) { |
Mike Reed | a2f14de | 2018-05-09 14:01:00 -0400 | [diff] [blame] | 36 | return false; |
Yuqian Li | d208a88 | 2018-01-04 10:08:42 -0500 | [diff] [blame] | 37 | } |
Mike Reed | a2f14de | 2018-05-09 14:01:00 -0400 | [diff] [blame] | 38 | matrix->postConcat(focalMatrix); |
Yuqian Li | d208a88 | 2018-01-04 10:08:42 -0500 | [diff] [blame] | 39 | fR1 = r1 / SkScalarAbs(1 - fFocalX); // focalMatrix has a scale of 1/(1-f) |
| 40 | |
| 41 | // The following transformations are just to accelerate the shader computation by saving |
| 42 | // some arithmatic operations. |
| 43 | if (this->isFocalOnCircle()) { |
Mike Reed | a2f14de | 2018-05-09 14:01:00 -0400 | [diff] [blame] | 44 | matrix->postScale(0.5, 0.5); |
Yuqian Li | d208a88 | 2018-01-04 10:08:42 -0500 | [diff] [blame] | 45 | } else { |
Mike Reed | a2f14de | 2018-05-09 14:01:00 -0400 | [diff] [blame] | 46 | matrix->postScale(fR1 / (fR1 * fR1 - 1), 1 / sqrt(SkScalarAbs(fR1 * fR1 - 1))); |
Yuqian Li | d208a88 | 2018-01-04 10:08:42 -0500 | [diff] [blame] | 47 | } |
Mike Reed | a2f14de | 2018-05-09 14:01:00 -0400 | [diff] [blame] | 48 | matrix->postScale(SkScalarAbs(1 - fFocalX), SkScalarAbs(1 - fFocalX)); // scale |1 - f| |
| 49 | return true; |
Yuqian Li | d208a88 | 2018-01-04 10:08:42 -0500 | [diff] [blame] | 50 | } |
| 51 | |
Florin Malita | 9c2212f | 2017-07-29 18:23:10 -0400 | [diff] [blame] | 52 | sk_sp<SkShader> SkTwoPointConicalGradient::Create(const SkPoint& c0, SkScalar r0, |
| 53 | const SkPoint& c1, SkScalar r1, |
Florin Malita | 5f379a8 | 2017-10-18 16:22:35 -0400 | [diff] [blame] | 54 | const Descriptor& desc) { |
Florin Malita | 9c2212f | 2017-07-29 18:23:10 -0400 | [diff] [blame] | 55 | SkMatrix gradientMatrix; |
| 56 | Type gradientType; |
| 57 | |
| 58 | if (SkScalarNearlyZero((c0 - c1).length())) { |
Yuqian Li | 45a6d71 | 2018-05-14 09:39:24 -0700 | [diff] [blame] | 59 | if (SkScalarNearlyZero(SkTMax(r0, r1))) { |
| 60 | return nullptr; // Degenerate case; avoid dividing by zero. |
| 61 | } |
Florin Malita | 9c2212f | 2017-07-29 18:23:10 -0400 | [diff] [blame] | 62 | // Concentric case: we can pretend we're radial (with a tiny twist). |
Mike Reed | 0b510fb | 2018-05-03 12:50:38 -0400 | [diff] [blame] | 63 | const SkScalar scale = sk_ieee_float_divide(1, SkTMax(r0, r1)); |
Florin Malita | 9c2212f | 2017-07-29 18:23:10 -0400 | [diff] [blame] | 64 | gradientMatrix = SkMatrix::MakeTrans(-c1.x(), -c1.y()); |
Florin Malita | 5f379a8 | 2017-10-18 16:22:35 -0400 | [diff] [blame] | 65 | gradientMatrix.postScale(scale, scale); |
Florin Malita | 9c2212f | 2017-07-29 18:23:10 -0400 | [diff] [blame] | 66 | |
| 67 | gradientType = Type::kRadial; |
| 68 | } else { |
| 69 | const SkPoint centers[2] = { c0 , c1 }; |
| 70 | const SkPoint unitvec[2] = { {0, 0}, {1, 0} }; |
| 71 | |
| 72 | if (!gradientMatrix.setPolyToPoly(centers, unitvec, 2)) { |
| 73 | // Degenerate case. |
| 74 | return nullptr; |
| 75 | } |
| 76 | |
Yuqian Li | d208a88 | 2018-01-04 10:08:42 -0500 | [diff] [blame] | 77 | gradientType = SkScalarNearlyZero(r1 - r0) ? Type::kStrip : Type::kFocal; |
Florin Malita | 9c2212f | 2017-07-29 18:23:10 -0400 | [diff] [blame] | 78 | } |
| 79 | |
Yuqian Li | d208a88 | 2018-01-04 10:08:42 -0500 | [diff] [blame] | 80 | FocalData focalData; |
| 81 | if (gradientType == Type::kFocal) { |
| 82 | const auto dCenter = (c0 - c1).length(); |
Mike Reed | a2f14de | 2018-05-09 14:01:00 -0400 | [diff] [blame] | 83 | if (!focalData.set(r0 / dCenter, r1 / dCenter, &gradientMatrix)) { |
| 84 | return nullptr; |
| 85 | } |
Yuqian Li | d208a88 | 2018-01-04 10:08:42 -0500 | [diff] [blame] | 86 | } |
Florin Malita | 5f379a8 | 2017-10-18 16:22:35 -0400 | [diff] [blame] | 87 | return sk_sp<SkShader>(new SkTwoPointConicalGradient(c0, r0, c1, r1, desc, |
Yuqian Li | d208a88 | 2018-01-04 10:08:42 -0500 | [diff] [blame] | 88 | gradientType, gradientMatrix, focalData)); |
Florin Malita | 9c2212f | 2017-07-29 18:23:10 -0400 | [diff] [blame] | 89 | } |
| 90 | |
rileya@google.com | 589708b | 2012-07-26 20:04:23 +0000 | [diff] [blame] | 91 | SkTwoPointConicalGradient::SkTwoPointConicalGradient( |
reed@google.com | 3d3a860 | 2013-05-24 14:58:44 +0000 | [diff] [blame] | 92 | const SkPoint& start, SkScalar startRadius, |
| 93 | const SkPoint& end, SkScalar endRadius, |
Yuqian Li | d208a88 | 2018-01-04 10:08:42 -0500 | [diff] [blame] | 94 | const Descriptor& desc, Type type, const SkMatrix& gradientMatrix, const FocalData& data) |
Florin Malita | 9c2212f | 2017-07-29 18:23:10 -0400 | [diff] [blame] | 95 | : SkGradientShaderBase(desc, gradientMatrix) |
reed | addf2ed | 2014-08-11 08:28:24 -0700 | [diff] [blame] | 96 | , fCenter1(start) |
| 97 | , fCenter2(end) |
| 98 | , fRadius1(startRadius) |
| 99 | , fRadius2(endRadius) |
Florin Malita | 9c2212f | 2017-07-29 18:23:10 -0400 | [diff] [blame] | 100 | , fType(type) |
reed | addf2ed | 2014-08-11 08:28:24 -0700 | [diff] [blame] | 101 | { |
rileya@google.com | 589708b | 2012-07-26 20:04:23 +0000 | [diff] [blame] | 102 | // this is degenerate, and should be caught by our caller |
| 103 | SkASSERT(fCenter1 != fCenter2 || fRadius1 != fRadius2); |
Yuqian Li | d208a88 | 2018-01-04 10:08:42 -0500 | [diff] [blame] | 104 | if (type == Type::kFocal) { |
| 105 | fFocalData = data; |
| 106 | } |
rileya@google.com | 589708b | 2012-07-26 20:04:23 +0000 | [diff] [blame] | 107 | } |
| 108 | |
commit-bot@chromium.org | 3fbab82 | 2013-03-20 00:49:57 +0000 | [diff] [blame] | 109 | bool SkTwoPointConicalGradient::isOpaque() const { |
robertphillips@google.com | cb6d97c | 2013-07-09 13:50:09 +0000 | [diff] [blame] | 110 | // Because areas outside the cone are left untouched, we cannot treat the |
| 111 | // shader as opaque even if the gradient itself is opaque. |
| 112 | // TODO(junov): Compute whether the cone fills the plane crbug.com/222380 |
| 113 | return false; |
commit-bot@chromium.org | 3fbab82 | 2013-03-20 00:49:57 +0000 | [diff] [blame] | 114 | } |
| 115 | |
commit-bot@chromium.org | 44d83c1 | 2014-04-21 13:10:25 +0000 | [diff] [blame] | 116 | // Returns the original non-sorted version of the gradient |
Florin Malita | 5f379a8 | 2017-10-18 16:22:35 -0400 | [diff] [blame] | 117 | SkShader::GradientType SkTwoPointConicalGradient::asAGradient(GradientInfo* info) const { |
rileya@google.com | 589708b | 2012-07-26 20:04:23 +0000 | [diff] [blame] | 118 | if (info) { |
Florin Malita | 5f379a8 | 2017-10-18 16:22:35 -0400 | [diff] [blame] | 119 | commonAsAGradient(info); |
rileya@google.com | 589708b | 2012-07-26 20:04:23 +0000 | [diff] [blame] | 120 | info->fPoint[0] = fCenter1; |
| 121 | info->fPoint[1] = fCenter2; |
| 122 | info->fRadius[0] = fRadius1; |
| 123 | info->fRadius[1] = fRadius2; |
| 124 | } |
| 125 | return kConical_GradientType; |
| 126 | } |
| 127 | |
reed | 60c9b58 | 2016-04-03 09:11:13 -0700 | [diff] [blame] | 128 | sk_sp<SkFlattenable> SkTwoPointConicalGradient::CreateProc(SkReadBuffer& buffer) { |
reed | 9fa60da | 2014-08-21 07:59:51 -0700 | [diff] [blame] | 129 | DescriptorScope desc; |
| 130 | if (!desc.unflatten(buffer)) { |
halcanary | 96fcdcc | 2015-08-27 07:41:13 -0700 | [diff] [blame] | 131 | return nullptr; |
reed | 9fa60da | 2014-08-21 07:59:51 -0700 | [diff] [blame] | 132 | } |
| 133 | SkPoint c1 = buffer.readPoint(); |
| 134 | SkPoint c2 = buffer.readPoint(); |
| 135 | SkScalar r1 = buffer.readScalar(); |
| 136 | SkScalar r2 = buffer.readScalar(); |
| 137 | |
Florin Malita | 5f379a8 | 2017-10-18 16:22:35 -0400 | [diff] [blame] | 138 | if (buffer.isVersionLT(SkReadBuffer::k2PtConicalNoFlip_Version) && buffer.readBool()) { |
Ben Wagner | f08d1d0 | 2018-06-18 15:11:00 -0400 | [diff] [blame] | 139 | using std::swap; |
Florin Malita | 5f379a8 | 2017-10-18 16:22:35 -0400 | [diff] [blame] | 140 | // legacy flipped gradient |
Ben Wagner | f08d1d0 | 2018-06-18 15:11:00 -0400 | [diff] [blame] | 141 | swap(c1, c2); |
| 142 | swap(r1, r2); |
reed | 9fa60da | 2014-08-21 07:59:51 -0700 | [diff] [blame] | 143 | |
brianosman | e25d71c | 2016-09-28 11:27:28 -0700 | [diff] [blame] | 144 | SkColor4f* colors = desc.mutableColors(); |
reed | 9fa60da | 2014-08-21 07:59:51 -0700 | [diff] [blame] | 145 | SkScalar* pos = desc.mutablePos(); |
| 146 | const int last = desc.fCount - 1; |
| 147 | const int half = desc.fCount >> 1; |
| 148 | for (int i = 0; i < half; ++i) { |
Ben Wagner | f08d1d0 | 2018-06-18 15:11:00 -0400 | [diff] [blame] | 149 | swap(colors[i], colors[last - i]); |
reed | 9fa60da | 2014-08-21 07:59:51 -0700 | [diff] [blame] | 150 | if (pos) { |
| 151 | SkScalar tmp = pos[i]; |
| 152 | pos[i] = SK_Scalar1 - pos[last - i]; |
| 153 | pos[last - i] = SK_Scalar1 - tmp; |
| 154 | } |
| 155 | } |
| 156 | if (pos) { |
| 157 | if (desc.fCount & 1) { |
| 158 | pos[half] = SK_Scalar1 - pos[half]; |
| 159 | } |
| 160 | } |
| 161 | } |
Kevin Lubick | daebae9 | 2018-05-17 11:29:10 -0400 | [diff] [blame] | 162 | if (!buffer.isValid()) { |
| 163 | return nullptr; |
| 164 | } |
brianosman | e25d71c | 2016-09-28 11:27:28 -0700 | [diff] [blame] | 165 | return SkGradientShader::MakeTwoPointConical(c1, r1, c2, r2, desc.fColors, |
| 166 | std::move(desc.fColorSpace), desc.fPos, |
reed | 8a21c9f | 2016-03-08 18:50:00 -0800 | [diff] [blame] | 167 | desc.fCount, desc.fTileMode, desc.fGradFlags, |
reed | 60c9b58 | 2016-04-03 09:11:13 -0700 | [diff] [blame] | 168 | desc.fLocalMatrix); |
reed | 9fa60da | 2014-08-21 07:59:51 -0700 | [diff] [blame] | 169 | } |
| 170 | |
| 171 | void SkTwoPointConicalGradient::flatten(SkWriteBuffer& buffer) const { |
rileya@google.com | 589708b | 2012-07-26 20:04:23 +0000 | [diff] [blame] | 172 | this->INHERITED::flatten(buffer); |
| 173 | buffer.writePoint(fCenter1); |
| 174 | buffer.writePoint(fCenter2); |
| 175 | buffer.writeScalar(fRadius1); |
| 176 | buffer.writeScalar(fRadius2); |
| 177 | } |
| 178 | |
Matt Sarett | 6cc6ae75 | 2017-04-18 18:29:12 -0400 | [diff] [blame] | 179 | sk_sp<SkShader> SkTwoPointConicalGradient::onMakeColorSpace(SkColorSpaceXformer* xformer) const { |
Florin Malita | 39d71de | 2017-10-31 11:33:49 -0400 | [diff] [blame] | 180 | const AutoXformColors xformedColors(*this, xformer); |
Florin Malita | 5f379a8 | 2017-10-18 16:22:35 -0400 | [diff] [blame] | 181 | return SkGradientShader::MakeTwoPointConical(fCenter1, fRadius1, fCenter2, fRadius2, |
Florin Malita | 39d71de | 2017-10-31 11:33:49 -0400 | [diff] [blame] | 182 | xformedColors.fColors.get(), fOrigPos, fColorCount, |
Florin Malita | 5f379a8 | 2017-10-18 16:22:35 -0400 | [diff] [blame] | 183 | fTileMode, fGradFlags, &this->getLocalMatrix()); |
Matt Sarett | 6cc6ae75 | 2017-04-18 18:29:12 -0400 | [diff] [blame] | 184 | } |
| 185 | |
Florin Malita | 50b2084 | 2017-07-29 19:08:28 -0400 | [diff] [blame] | 186 | void SkTwoPointConicalGradient::appendGradientStages(SkArenaAlloc* alloc, SkRasterPipeline* p, |
| 187 | SkRasterPipeline* postPipeline) const { |
Florin Malita | a66ef2d | 2017-06-28 10:02:40 -0400 | [diff] [blame] | 188 | const auto dRadius = fRadius2 - fRadius1; |
Florin Malita | a66ef2d | 2017-06-28 10:02:40 -0400 | [diff] [blame] | 189 | |
Florin Malita | 9c2212f | 2017-07-29 18:23:10 -0400 | [diff] [blame] | 190 | if (fType == Type::kRadial) { |
Florin Malita | 0bb0411 | 2017-06-27 14:35:50 -0400 | [diff] [blame] | 191 | p->append(SkRasterPipeline::xy_to_radius); |
| 192 | |
| 193 | // Tiny twist: radial computes a t for [0, r2], but we want a t for [r1, r2]. |
Florin Malita | 5f379a8 | 2017-10-18 16:22:35 -0400 | [diff] [blame] | 194 | auto scale = SkTMax(fRadius1, fRadius2) / dRadius; |
Florin Malita | a66ef2d | 2017-06-28 10:02:40 -0400 | [diff] [blame] | 195 | auto bias = -fRadius1 / dRadius; |
Florin Malita | 0bb0411 | 2017-06-27 14:35:50 -0400 | [diff] [blame] | 196 | |
Mike Reed | 6b59bf4 | 2017-07-03 21:26:44 -0400 | [diff] [blame] | 197 | p->append_matrix(alloc, SkMatrix::Concat(SkMatrix::MakeTrans(bias, 0), |
| 198 | SkMatrix::MakeScale(scale, 1))); |
Florin Malita | 50b2084 | 2017-07-29 19:08:28 -0400 | [diff] [blame] | 199 | return; |
Florin Malita | 0bb0411 | 2017-06-27 14:35:50 -0400 | [diff] [blame] | 200 | } |
| 201 | |
Yuqian Li | d208a88 | 2018-01-04 10:08:42 -0500 | [diff] [blame] | 202 | if (fType == Type::kStrip) { |
| 203 | auto* ctx = alloc->make<SkJumper_2PtConicalCtx>(); |
| 204 | SkScalar scaledR0 = fRadius1 / this->getCenterX1(); |
| 205 | ctx->fP0 = scaledR0 * scaledR0; |
| 206 | p->append(SkRasterPipeline::xy_to_2pt_conical_strip, ctx); |
| 207 | p->append(SkRasterPipeline::mask_2pt_conical_nan, ctx); |
| 208 | postPipeline->append(SkRasterPipeline::apply_vector_mask, &ctx->fMask); |
| 209 | return; |
| 210 | } |
| 211 | |
| 212 | auto* ctx = alloc->make<SkJumper_2PtConicalCtx>(); |
| 213 | ctx->fP0 = 1/fFocalData.fR1; |
| 214 | ctx->fP1 = fFocalData.fFocalX; |
| 215 | |
| 216 | if (fFocalData.isFocalOnCircle()) { |
| 217 | p->append(SkRasterPipeline::xy_to_2pt_conical_focal_on_circle); |
| 218 | } else if (fFocalData.isWellBehaved()) { |
| 219 | p->append(SkRasterPipeline::xy_to_2pt_conical_well_behaved, ctx); |
| 220 | } else if (fFocalData.isSwapped() || 1 - fFocalData.fFocalX < 0) { |
| 221 | p->append(SkRasterPipeline::xy_to_2pt_conical_smaller, ctx); |
| 222 | } else { |
| 223 | p->append(SkRasterPipeline::xy_to_2pt_conical_greater, ctx); |
| 224 | } |
| 225 | |
| 226 | if (!fFocalData.isWellBehaved()) { |
| 227 | p->append(SkRasterPipeline::mask_2pt_conical_degenerates, ctx); |
| 228 | } |
| 229 | if (1 - fFocalData.fFocalX < 0) { |
| 230 | p->append(SkRasterPipeline::negate_x); |
| 231 | } |
| 232 | if (!fFocalData.isNativelyFocal()) { |
| 233 | p->append(SkRasterPipeline::alter_2pt_conical_compensate_focal, ctx); |
| 234 | } |
| 235 | if (fFocalData.isSwapped()) { |
| 236 | p->append(SkRasterPipeline::alter_2pt_conical_unswap); |
| 237 | } |
| 238 | if (!fFocalData.isWellBehaved()) { |
| 239 | postPipeline->append(SkRasterPipeline::apply_vector_mask, &ctx->fMask); |
| 240 | } |
Florin Malita | 0bb0411 | 2017-06-27 14:35:50 -0400 | [diff] [blame] | 241 | } |
Michael Ludwig | afebe16 | 2018-09-12 15:24:34 -0400 | [diff] [blame^] | 242 | |
| 243 | ///////////////////////////////////////////////////////////////////// |
| 244 | |
| 245 | #if SK_SUPPORT_GPU |
| 246 | |
| 247 | #include "gradients/GrGradientShader.h" |
| 248 | |
| 249 | std::unique_ptr<GrFragmentProcessor> SkTwoPointConicalGradient::asFragmentProcessor( |
| 250 | const GrFPArgs& args) const { |
| 251 | return GrGradientShader::MakeConical(*this, args); |
| 252 | } |
| 253 | |
| 254 | #endif |