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 | |
| 8 | #include "SkTwoPointConicalGradient.h" |
commit-bot@chromium.org | aa64fbf | 2014-04-03 14:59:19 +0000 | [diff] [blame] | 9 | |
Florin Malita | a66ef2d | 2017-06-28 10:02:40 -0400 | [diff] [blame] | 10 | #include "SkRasterPipeline.h" |
| 11 | #include "../../jumper/SkJumper.h" |
| 12 | |
Florin Malita | 9c2212f | 2017-07-29 18:23:10 -0400 | [diff] [blame] | 13 | sk_sp<SkShader> SkTwoPointConicalGradient::Create(const SkPoint& c0, SkScalar r0, |
| 14 | const SkPoint& c1, SkScalar r1, |
Florin Malita | 5f379a8 | 2017-10-18 16:22:35 -0400 | [diff] [blame^] | 15 | const Descriptor& desc) { |
Florin Malita | 9c2212f | 2017-07-29 18:23:10 -0400 | [diff] [blame] | 16 | SkMatrix gradientMatrix; |
| 17 | Type gradientType; |
| 18 | |
| 19 | if (SkScalarNearlyZero((c0 - c1).length())) { |
| 20 | // Concentric case: we can pretend we're radial (with a tiny twist). |
Florin Malita | 5f379a8 | 2017-10-18 16:22:35 -0400 | [diff] [blame^] | 21 | const SkScalar scale = 1.0f / SkTMax(r0, r1); |
Florin Malita | 9c2212f | 2017-07-29 18:23:10 -0400 | [diff] [blame] | 22 | gradientMatrix = SkMatrix::MakeTrans(-c1.x(), -c1.y()); |
Florin Malita | 5f379a8 | 2017-10-18 16:22:35 -0400 | [diff] [blame^] | 23 | gradientMatrix.postScale(scale, scale); |
Florin Malita | 9c2212f | 2017-07-29 18:23:10 -0400 | [diff] [blame] | 24 | |
| 25 | gradientType = Type::kRadial; |
| 26 | } else { |
| 27 | const SkPoint centers[2] = { c0 , c1 }; |
| 28 | const SkPoint unitvec[2] = { {0, 0}, {1, 0} }; |
| 29 | |
| 30 | if (!gradientMatrix.setPolyToPoly(centers, unitvec, 2)) { |
| 31 | // Degenerate case. |
| 32 | return nullptr; |
| 33 | } |
| 34 | |
| 35 | // General two-point case. |
| 36 | gradientType = Type::kTwoPoint; |
| 37 | } |
| 38 | |
Florin Malita | 5f379a8 | 2017-10-18 16:22:35 -0400 | [diff] [blame^] | 39 | return sk_sp<SkShader>(new SkTwoPointConicalGradient(c0, r0, c1, r1, desc, |
Florin Malita | 9c2212f | 2017-07-29 18:23:10 -0400 | [diff] [blame] | 40 | gradientType, gradientMatrix)); |
| 41 | } |
| 42 | |
rileya@google.com | 589708b | 2012-07-26 20:04:23 +0000 | [diff] [blame] | 43 | SkTwoPointConicalGradient::SkTwoPointConicalGradient( |
reed@google.com | 3d3a860 | 2013-05-24 14:58:44 +0000 | [diff] [blame] | 44 | const SkPoint& start, SkScalar startRadius, |
| 45 | const SkPoint& end, SkScalar endRadius, |
Florin Malita | 5f379a8 | 2017-10-18 16:22:35 -0400 | [diff] [blame^] | 46 | const Descriptor& desc, Type type, const SkMatrix& gradientMatrix) |
Florin Malita | 9c2212f | 2017-07-29 18:23:10 -0400 | [diff] [blame] | 47 | : SkGradientShaderBase(desc, gradientMatrix) |
reed | addf2ed | 2014-08-11 08:28:24 -0700 | [diff] [blame] | 48 | , fCenter1(start) |
| 49 | , fCenter2(end) |
| 50 | , fRadius1(startRadius) |
| 51 | , fRadius2(endRadius) |
Florin Malita | 9c2212f | 2017-07-29 18:23:10 -0400 | [diff] [blame] | 52 | , fType(type) |
reed | addf2ed | 2014-08-11 08:28:24 -0700 | [diff] [blame] | 53 | { |
rileya@google.com | 589708b | 2012-07-26 20:04:23 +0000 | [diff] [blame] | 54 | // this is degenerate, and should be caught by our caller |
| 55 | SkASSERT(fCenter1 != fCenter2 || fRadius1 != fRadius2); |
rileya@google.com | 589708b | 2012-07-26 20:04:23 +0000 | [diff] [blame] | 56 | } |
| 57 | |
commit-bot@chromium.org | 3fbab82 | 2013-03-20 00:49:57 +0000 | [diff] [blame] | 58 | bool SkTwoPointConicalGradient::isOpaque() const { |
robertphillips@google.com | cb6d97c | 2013-07-09 13:50:09 +0000 | [diff] [blame] | 59 | // Because areas outside the cone are left untouched, we cannot treat the |
| 60 | // shader as opaque even if the gradient itself is opaque. |
| 61 | // TODO(junov): Compute whether the cone fills the plane crbug.com/222380 |
| 62 | return false; |
commit-bot@chromium.org | 3fbab82 | 2013-03-20 00:49:57 +0000 | [diff] [blame] | 63 | } |
| 64 | |
commit-bot@chromium.org | 44d83c1 | 2014-04-21 13:10:25 +0000 | [diff] [blame] | 65 | // Returns the original non-sorted version of the gradient |
Florin Malita | 5f379a8 | 2017-10-18 16:22:35 -0400 | [diff] [blame^] | 66 | SkShader::GradientType SkTwoPointConicalGradient::asAGradient(GradientInfo* info) const { |
rileya@google.com | 589708b | 2012-07-26 20:04:23 +0000 | [diff] [blame] | 67 | if (info) { |
Florin Malita | 5f379a8 | 2017-10-18 16:22:35 -0400 | [diff] [blame^] | 68 | commonAsAGradient(info); |
rileya@google.com | 589708b | 2012-07-26 20:04:23 +0000 | [diff] [blame] | 69 | info->fPoint[0] = fCenter1; |
| 70 | info->fPoint[1] = fCenter2; |
| 71 | info->fRadius[0] = fRadius1; |
| 72 | info->fRadius[1] = fRadius2; |
| 73 | } |
| 74 | return kConical_GradientType; |
| 75 | } |
| 76 | |
reed | 60c9b58 | 2016-04-03 09:11:13 -0700 | [diff] [blame] | 77 | sk_sp<SkFlattenable> SkTwoPointConicalGradient::CreateProc(SkReadBuffer& buffer) { |
reed | 9fa60da | 2014-08-21 07:59:51 -0700 | [diff] [blame] | 78 | DescriptorScope desc; |
| 79 | if (!desc.unflatten(buffer)) { |
halcanary | 96fcdcc | 2015-08-27 07:41:13 -0700 | [diff] [blame] | 80 | return nullptr; |
reed | 9fa60da | 2014-08-21 07:59:51 -0700 | [diff] [blame] | 81 | } |
| 82 | SkPoint c1 = buffer.readPoint(); |
| 83 | SkPoint c2 = buffer.readPoint(); |
| 84 | SkScalar r1 = buffer.readScalar(); |
| 85 | SkScalar r2 = buffer.readScalar(); |
| 86 | |
Florin Malita | 5f379a8 | 2017-10-18 16:22:35 -0400 | [diff] [blame^] | 87 | if (buffer.isVersionLT(SkReadBuffer::k2PtConicalNoFlip_Version) && buffer.readBool()) { |
| 88 | // legacy flipped gradient |
reed | 9fa60da | 2014-08-21 07:59:51 -0700 | [diff] [blame] | 89 | SkTSwap(c1, c2); |
| 90 | SkTSwap(r1, r2); |
| 91 | |
brianosman | e25d71c | 2016-09-28 11:27:28 -0700 | [diff] [blame] | 92 | SkColor4f* colors = desc.mutableColors(); |
reed | 9fa60da | 2014-08-21 07:59:51 -0700 | [diff] [blame] | 93 | SkScalar* pos = desc.mutablePos(); |
| 94 | const int last = desc.fCount - 1; |
| 95 | const int half = desc.fCount >> 1; |
| 96 | for (int i = 0; i < half; ++i) { |
| 97 | SkTSwap(colors[i], colors[last - i]); |
| 98 | if (pos) { |
| 99 | SkScalar tmp = pos[i]; |
| 100 | pos[i] = SK_Scalar1 - pos[last - i]; |
| 101 | pos[last - i] = SK_Scalar1 - tmp; |
| 102 | } |
| 103 | } |
| 104 | if (pos) { |
| 105 | if (desc.fCount & 1) { |
| 106 | pos[half] = SK_Scalar1 - pos[half]; |
| 107 | } |
| 108 | } |
| 109 | } |
| 110 | |
brianosman | e25d71c | 2016-09-28 11:27:28 -0700 | [diff] [blame] | 111 | return SkGradientShader::MakeTwoPointConical(c1, r1, c2, r2, desc.fColors, |
| 112 | std::move(desc.fColorSpace), desc.fPos, |
reed | 8a21c9f | 2016-03-08 18:50:00 -0800 | [diff] [blame] | 113 | desc.fCount, desc.fTileMode, desc.fGradFlags, |
reed | 60c9b58 | 2016-04-03 09:11:13 -0700 | [diff] [blame] | 114 | desc.fLocalMatrix); |
reed | 9fa60da | 2014-08-21 07:59:51 -0700 | [diff] [blame] | 115 | } |
| 116 | |
| 117 | void SkTwoPointConicalGradient::flatten(SkWriteBuffer& buffer) const { |
rileya@google.com | 589708b | 2012-07-26 20:04:23 +0000 | [diff] [blame] | 118 | this->INHERITED::flatten(buffer); |
| 119 | buffer.writePoint(fCenter1); |
| 120 | buffer.writePoint(fCenter2); |
| 121 | buffer.writeScalar(fRadius1); |
| 122 | buffer.writeScalar(fRadius2); |
| 123 | } |
| 124 | |
bsalomon@google.com | cf8fb1f | 2012-08-02 14:03:32 +0000 | [diff] [blame] | 125 | #if SK_SUPPORT_GPU |
| 126 | |
dandov | 9de5b51 | 2014-06-10 14:38:28 -0700 | [diff] [blame] | 127 | #include "SkGr.h" |
brianosman | 9557c27 | 2016-09-15 06:59:15 -0700 | [diff] [blame] | 128 | #include "SkTwoPointConicalGradient_gpu.h" |
dandov | 9de5b51 | 2014-06-10 14:38:28 -0700 | [diff] [blame] | 129 | |
Brian Salomon | aff329b | 2017-08-11 09:40:37 -0400 | [diff] [blame] | 130 | std::unique_ptr<GrFragmentProcessor> SkTwoPointConicalGradient::asFragmentProcessor( |
brianosman | 1638c0d | 2016-07-25 05:12:53 -0700 | [diff] [blame] | 131 | const AsFPArgs& args) const { |
brianosman | 839345d | 2016-07-22 11:04:53 -0700 | [diff] [blame] | 132 | SkASSERT(args.fContext); |
brianosman | b9c5137 | 2016-09-15 11:09:45 -0700 | [diff] [blame] | 133 | sk_sp<GrColorSpaceXform> colorSpaceXform = GrColorSpaceXform::Make(fColorSpace.get(), |
| 134 | args.fDstColorSpace); |
Brian Salomon | aff329b | 2017-08-11 09:40:37 -0400 | [diff] [blame] | 135 | auto inner = Gr2PtConicalGradientEffect::Make(GrGradientEffect::CreateArgs( |
| 136 | args.fContext, this, args.fLocalMatrix, fTileMode, std::move(colorSpaceXform), |
| 137 | SkToBool(args.fDstColorSpace))); |
Brian Salomon | 6af2701 | 2017-06-09 08:21:42 -0400 | [diff] [blame] | 138 | if (!inner) { |
| 139 | return nullptr; |
| 140 | } |
bungeman | 06ca8ec | 2016-06-09 08:01:03 -0700 | [diff] [blame] | 141 | return GrFragmentProcessor::MulOutputByInputAlpha(std::move(inner)); |
bsalomon@google.com | cf8fb1f | 2012-08-02 14:03:32 +0000 | [diff] [blame] | 142 | } |
| 143 | |
twiz@google.com | a5e65ec | 2012-08-02 15:15:16 +0000 | [diff] [blame] | 144 | #endif |
robertphillips@google.com | 76f9e93 | 2013-01-15 20:17:47 +0000 | [diff] [blame] | 145 | |
Matt Sarett | 6cc6ae75 | 2017-04-18 18:29:12 -0400 | [diff] [blame] | 146 | sk_sp<SkShader> SkTwoPointConicalGradient::onMakeColorSpace(SkColorSpaceXformer* xformer) const { |
Florin Malita | 5f379a8 | 2017-10-18 16:22:35 -0400 | [diff] [blame^] | 147 | SkSTArray<8, SkColor> xformedColors(fColorCount); |
| 148 | xformer->apply(xformedColors.begin(), fOrigColors, fColorCount); |
| 149 | return SkGradientShader::MakeTwoPointConical(fCenter1, fRadius1, fCenter2, fRadius2, |
| 150 | xformedColors.begin(), fOrigPos, fColorCount, |
| 151 | fTileMode, fGradFlags, &this->getLocalMatrix()); |
Matt Sarett | 6cc6ae75 | 2017-04-18 18:29:12 -0400 | [diff] [blame] | 152 | } |
| 153 | |
| 154 | |
commit-bot@chromium.org | 0f10f7b | 2014-03-13 18:02:17 +0000 | [diff] [blame] | 155 | #ifndef SK_IGNORE_TO_STRING |
robertphillips@google.com | 76f9e93 | 2013-01-15 20:17:47 +0000 | [diff] [blame] | 156 | void SkTwoPointConicalGradient::toString(SkString* str) const { |
| 157 | str->append("SkTwoPointConicalGradient: ("); |
| 158 | |
| 159 | str->append("center1: ("); |
| 160 | str->appendScalar(fCenter1.fX); |
| 161 | str->append(", "); |
| 162 | str->appendScalar(fCenter1.fY); |
| 163 | str->append(") radius1: "); |
| 164 | str->appendScalar(fRadius1); |
| 165 | str->append(" "); |
| 166 | |
| 167 | str->append("center2: ("); |
| 168 | str->appendScalar(fCenter2.fX); |
| 169 | str->append(", "); |
| 170 | str->appendScalar(fCenter2.fY); |
| 171 | str->append(") radius2: "); |
| 172 | str->appendScalar(fRadius2); |
| 173 | str->append(" "); |
| 174 | |
| 175 | this->INHERITED::toString(str); |
| 176 | |
| 177 | str->append(")"); |
| 178 | } |
| 179 | #endif |
Florin Malita | 0bb0411 | 2017-06-27 14:35:50 -0400 | [diff] [blame] | 180 | |
Florin Malita | 50b2084 | 2017-07-29 19:08:28 -0400 | [diff] [blame] | 181 | void SkTwoPointConicalGradient::appendGradientStages(SkArenaAlloc* alloc, SkRasterPipeline* p, |
| 182 | SkRasterPipeline* postPipeline) const { |
Florin Malita | a66ef2d | 2017-06-28 10:02:40 -0400 | [diff] [blame] | 183 | const auto dRadius = fRadius2 - fRadius1; |
Florin Malita | a66ef2d | 2017-06-28 10:02:40 -0400 | [diff] [blame] | 184 | |
Florin Malita | 9c2212f | 2017-07-29 18:23:10 -0400 | [diff] [blame] | 185 | if (fType == Type::kRadial) { |
Florin Malita | 0bb0411 | 2017-06-27 14:35:50 -0400 | [diff] [blame] | 186 | p->append(SkRasterPipeline::xy_to_radius); |
| 187 | |
| 188 | // 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^] | 189 | auto scale = SkTMax(fRadius1, fRadius2) / dRadius; |
Florin Malita | a66ef2d | 2017-06-28 10:02:40 -0400 | [diff] [blame] | 190 | auto bias = -fRadius1 / dRadius; |
Florin Malita | 0bb0411 | 2017-06-27 14:35:50 -0400 | [diff] [blame] | 191 | |
Mike Reed | 6b59bf4 | 2017-07-03 21:26:44 -0400 | [diff] [blame] | 192 | p->append_matrix(alloc, SkMatrix::Concat(SkMatrix::MakeTrans(bias, 0), |
| 193 | SkMatrix::MakeScale(scale, 1))); |
Florin Malita | 50b2084 | 2017-07-29 19:08:28 -0400 | [diff] [blame] | 194 | return; |
Florin Malita | 0bb0411 | 2017-06-27 14:35:50 -0400 | [diff] [blame] | 195 | } |
| 196 | |
Florin Malita | 9c2212f | 2017-07-29 18:23:10 -0400 | [diff] [blame] | 197 | const auto dCenter = (fCenter1 - fCenter2).length(); |
Florin Malita | a66ef2d | 2017-06-28 10:02:40 -0400 | [diff] [blame] | 198 | |
| 199 | // Since we've squashed the centers into a unit vector, we must also scale |
| 200 | // all the coefficient variables by (1 / dCenter). |
| 201 | const auto coeffA = 1 - dRadius * dRadius / (dCenter * dCenter); |
Florin Malita | a66ef2d | 2017-06-28 10:02:40 -0400 | [diff] [blame] | 202 | auto* ctx = alloc->make<SkJumper_2PtConicalCtx>(); |
| 203 | ctx->fCoeffA = coeffA; |
| 204 | ctx->fInvCoeffA = 1 / coeffA; |
| 205 | ctx->fR0 = fRadius1 / dCenter; |
| 206 | ctx->fDR = dRadius / dCenter; |
| 207 | |
Florin Malita | 9026fe1 | 2017-06-29 11:03:45 -0400 | [diff] [blame] | 208 | // Is the solver guaranteed to not produce degenerates? |
| 209 | bool isWellBehaved = true; |
| 210 | |
Florin Malita | 2e40900 | 2017-06-28 14:46:54 -0400 | [diff] [blame] | 211 | if (SkScalarNearlyZero(coeffA)) { |
| 212 | // The focal point is on the edge of the end circle. |
| 213 | p->append(SkRasterPipeline::xy_to_2pt_conical_linear, ctx); |
Florin Malita | 9026fe1 | 2017-06-29 11:03:45 -0400 | [diff] [blame] | 214 | isWellBehaved = false; |
Florin Malita | 2e40900 | 2017-06-28 14:46:54 -0400 | [diff] [blame] | 215 | } else { |
Florin Malita | 5f379a8 | 2017-10-18 16:22:35 -0400 | [diff] [blame^] | 216 | isWellBehaved = SkScalarAbs(dRadius) >= dCenter; |
| 217 | bool isFlipped = isWellBehaved && dRadius < 0; |
Florin Malita | 9026fe1 | 2017-06-29 11:03:45 -0400 | [diff] [blame] | 218 | |
Florin Malita | 5f379a8 | 2017-10-18 16:22:35 -0400 | [diff] [blame^] | 219 | // We want the larger root, per spec: |
| 220 | // "For all values of ω where r(ω) > 0, starting with the value of ω nearest |
| 221 | // to positive infinity and ending with the value of ω nearest to negative |
| 222 | // infinity, draw the circumference of the circle with radius r(ω) at position |
| 223 | // (x(ω), y(ω)), with the color at ω, but only painting on the parts of the |
| 224 | // bitmap that have not yet been painted on by earlier circles in this step for |
| 225 | // this rendering of the gradient." |
| 226 | // (https://html.spec.whatwg.org/multipage/canvas.html#dom-context-2d-createradialgradient) |
| 227 | // |
| 228 | // ... except when the gradient is flipped. |
| 229 | p->append(isFlipped ? SkRasterPipeline::xy_to_2pt_conical_quadratic_min |
| 230 | : SkRasterPipeline::xy_to_2pt_conical_quadratic_max, ctx); |
Florin Malita | 9026fe1 | 2017-06-29 11:03:45 -0400 | [diff] [blame] | 231 | } |
| 232 | |
| 233 | if (!isWellBehaved) { |
| 234 | p->append(SkRasterPipeline::mask_2pt_conical_degenerates, ctx); |
| 235 | postPipeline->append(SkRasterPipeline::apply_vector_mask, &ctx->fMask); |
Florin Malita | 2e40900 | 2017-06-28 14:46:54 -0400 | [diff] [blame] | 236 | } |
Florin Malita | 0bb0411 | 2017-06-27 14:35:50 -0400 | [diff] [blame] | 237 | } |