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, |
| 15 | bool flipped, const Descriptor& desc) { |
| 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). |
| 21 | gradientMatrix = SkMatrix::MakeTrans(-c1.x(), -c1.y()); |
| 22 | gradientMatrix.postScale(1 / r1, 1 / r1); |
| 23 | |
| 24 | gradientType = Type::kRadial; |
| 25 | } else { |
| 26 | const SkPoint centers[2] = { c0 , c1 }; |
| 27 | const SkPoint unitvec[2] = { {0, 0}, {1, 0} }; |
| 28 | |
| 29 | if (!gradientMatrix.setPolyToPoly(centers, unitvec, 2)) { |
| 30 | // Degenerate case. |
| 31 | return nullptr; |
| 32 | } |
| 33 | |
| 34 | // General two-point case. |
| 35 | gradientType = Type::kTwoPoint; |
| 36 | } |
| 37 | |
| 38 | return sk_sp<SkShader>(new SkTwoPointConicalGradient(c0, r0, c1, r1, flipped, desc, |
| 39 | gradientType, gradientMatrix)); |
| 40 | } |
| 41 | |
rileya@google.com | 589708b | 2012-07-26 20:04:23 +0000 | [diff] [blame] | 42 | SkTwoPointConicalGradient::SkTwoPointConicalGradient( |
reed@google.com | 3d3a860 | 2013-05-24 14:58:44 +0000 | [diff] [blame] | 43 | const SkPoint& start, SkScalar startRadius, |
| 44 | const SkPoint& end, SkScalar endRadius, |
Florin Malita | 9c2212f | 2017-07-29 18:23:10 -0400 | [diff] [blame] | 45 | bool flippedGrad, const Descriptor& desc, |
| 46 | Type type, const SkMatrix& gradientMatrix) |
| 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) |
| 52 | , fFlippedGrad(flippedGrad) |
Florin Malita | 9c2212f | 2017-07-29 18:23:10 -0400 | [diff] [blame] | 53 | , fType(type) |
reed | addf2ed | 2014-08-11 08:28:24 -0700 | [diff] [blame] | 54 | { |
rileya@google.com | 589708b | 2012-07-26 20:04:23 +0000 | [diff] [blame] | 55 | // this is degenerate, and should be caught by our caller |
| 56 | SkASSERT(fCenter1 != fCenter2 || fRadius1 != fRadius2); |
rileya@google.com | 589708b | 2012-07-26 20:04:23 +0000 | [diff] [blame] | 57 | } |
| 58 | |
commit-bot@chromium.org | 3fbab82 | 2013-03-20 00:49:57 +0000 | [diff] [blame] | 59 | bool SkTwoPointConicalGradient::isOpaque() const { |
robertphillips@google.com | cb6d97c | 2013-07-09 13:50:09 +0000 | [diff] [blame] | 60 | // Because areas outside the cone are left untouched, we cannot treat the |
| 61 | // shader as opaque even if the gradient itself is opaque. |
| 62 | // TODO(junov): Compute whether the cone fills the plane crbug.com/222380 |
| 63 | return false; |
commit-bot@chromium.org | 3fbab82 | 2013-03-20 00:49:57 +0000 | [diff] [blame] | 64 | } |
| 65 | |
commit-bot@chromium.org | 44d83c1 | 2014-04-21 13:10:25 +0000 | [diff] [blame] | 66 | // Returns the original non-sorted version of the gradient |
rileya@google.com | 589708b | 2012-07-26 20:04:23 +0000 | [diff] [blame] | 67 | SkShader::GradientType SkTwoPointConicalGradient::asAGradient( |
| 68 | GradientInfo* info) const { |
| 69 | if (info) { |
commit-bot@chromium.org | 44d83c1 | 2014-04-21 13:10:25 +0000 | [diff] [blame] | 70 | commonAsAGradient(info, fFlippedGrad); |
rileya@google.com | 589708b | 2012-07-26 20:04:23 +0000 | [diff] [blame] | 71 | info->fPoint[0] = fCenter1; |
| 72 | info->fPoint[1] = fCenter2; |
| 73 | info->fRadius[0] = fRadius1; |
| 74 | info->fRadius[1] = fRadius2; |
commit-bot@chromium.org | 44d83c1 | 2014-04-21 13:10:25 +0000 | [diff] [blame] | 75 | if (fFlippedGrad) { |
| 76 | SkTSwap(info->fPoint[0], info->fPoint[1]); |
| 77 | SkTSwap(info->fRadius[0], info->fRadius[1]); |
| 78 | } |
rileya@google.com | 589708b | 2012-07-26 20:04:23 +0000 | [diff] [blame] | 79 | } |
| 80 | return kConical_GradientType; |
| 81 | } |
| 82 | |
reed | 60c9b58 | 2016-04-03 09:11:13 -0700 | [diff] [blame] | 83 | sk_sp<SkFlattenable> SkTwoPointConicalGradient::CreateProc(SkReadBuffer& buffer) { |
reed | 9fa60da | 2014-08-21 07:59:51 -0700 | [diff] [blame] | 84 | DescriptorScope desc; |
| 85 | if (!desc.unflatten(buffer)) { |
halcanary | 96fcdcc | 2015-08-27 07:41:13 -0700 | [diff] [blame] | 86 | return nullptr; |
reed | 9fa60da | 2014-08-21 07:59:51 -0700 | [diff] [blame] | 87 | } |
| 88 | SkPoint c1 = buffer.readPoint(); |
| 89 | SkPoint c2 = buffer.readPoint(); |
| 90 | SkScalar r1 = buffer.readScalar(); |
| 91 | SkScalar r2 = buffer.readScalar(); |
| 92 | |
| 93 | if (buffer.readBool()) { // flipped |
| 94 | SkTSwap(c1, c2); |
| 95 | SkTSwap(r1, r2); |
| 96 | |
brianosman | e25d71c | 2016-09-28 11:27:28 -0700 | [diff] [blame] | 97 | SkColor4f* colors = desc.mutableColors(); |
reed | 9fa60da | 2014-08-21 07:59:51 -0700 | [diff] [blame] | 98 | SkScalar* pos = desc.mutablePos(); |
| 99 | const int last = desc.fCount - 1; |
| 100 | const int half = desc.fCount >> 1; |
| 101 | for (int i = 0; i < half; ++i) { |
| 102 | SkTSwap(colors[i], colors[last - i]); |
| 103 | if (pos) { |
| 104 | SkScalar tmp = pos[i]; |
| 105 | pos[i] = SK_Scalar1 - pos[last - i]; |
| 106 | pos[last - i] = SK_Scalar1 - tmp; |
| 107 | } |
| 108 | } |
| 109 | if (pos) { |
| 110 | if (desc.fCount & 1) { |
| 111 | pos[half] = SK_Scalar1 - pos[half]; |
| 112 | } |
| 113 | } |
| 114 | } |
| 115 | |
brianosman | e25d71c | 2016-09-28 11:27:28 -0700 | [diff] [blame] | 116 | return SkGradientShader::MakeTwoPointConical(c1, r1, c2, r2, desc.fColors, |
| 117 | std::move(desc.fColorSpace), desc.fPos, |
reed | 8a21c9f | 2016-03-08 18:50:00 -0800 | [diff] [blame] | 118 | desc.fCount, desc.fTileMode, desc.fGradFlags, |
reed | 60c9b58 | 2016-04-03 09:11:13 -0700 | [diff] [blame] | 119 | desc.fLocalMatrix); |
reed | 9fa60da | 2014-08-21 07:59:51 -0700 | [diff] [blame] | 120 | } |
| 121 | |
| 122 | void SkTwoPointConicalGradient::flatten(SkWriteBuffer& buffer) const { |
rileya@google.com | 589708b | 2012-07-26 20:04:23 +0000 | [diff] [blame] | 123 | this->INHERITED::flatten(buffer); |
| 124 | buffer.writePoint(fCenter1); |
| 125 | buffer.writePoint(fCenter2); |
| 126 | buffer.writeScalar(fRadius1); |
| 127 | buffer.writeScalar(fRadius2); |
commit-bot@chromium.org | 44d83c1 | 2014-04-21 13:10:25 +0000 | [diff] [blame] | 128 | buffer.writeBool(fFlippedGrad); |
rileya@google.com | 589708b | 2012-07-26 20:04:23 +0000 | [diff] [blame] | 129 | } |
| 130 | |
bsalomon@google.com | cf8fb1f | 2012-08-02 14:03:32 +0000 | [diff] [blame] | 131 | #if SK_SUPPORT_GPU |
| 132 | |
dandov | 9de5b51 | 2014-06-10 14:38:28 -0700 | [diff] [blame] | 133 | #include "SkGr.h" |
brianosman | 9557c27 | 2016-09-15 06:59:15 -0700 | [diff] [blame] | 134 | #include "SkTwoPointConicalGradient_gpu.h" |
dandov | 9de5b51 | 2014-06-10 14:38:28 -0700 | [diff] [blame] | 135 | |
bungeman | 06ca8ec | 2016-06-09 08:01:03 -0700 | [diff] [blame] | 136 | sk_sp<GrFragmentProcessor> SkTwoPointConicalGradient::asFragmentProcessor( |
brianosman | 1638c0d | 2016-07-25 05:12:53 -0700 | [diff] [blame] | 137 | const AsFPArgs& args) const { |
brianosman | 839345d | 2016-07-22 11:04:53 -0700 | [diff] [blame] | 138 | SkASSERT(args.fContext); |
brianosman | b9c5137 | 2016-09-15 11:09:45 -0700 | [diff] [blame] | 139 | sk_sp<GrColorSpaceXform> colorSpaceXform = GrColorSpaceXform::Make(fColorSpace.get(), |
| 140 | args.fDstColorSpace); |
brianosman | 9557c27 | 2016-09-15 06:59:15 -0700 | [diff] [blame] | 141 | sk_sp<GrFragmentProcessor> inner(Gr2PtConicalGradientEffect::Make( |
brianosman | b9c5137 | 2016-09-15 11:09:45 -0700 | [diff] [blame] | 142 | GrGradientEffect::CreateArgs(args.fContext, this, args.fLocalMatrix, fTileMode, |
| 143 | std::move(colorSpaceXform), SkToBool(args.fDstColorSpace)))); |
Brian Salomon | 6af2701 | 2017-06-09 08:21:42 -0400 | [diff] [blame] | 144 | if (!inner) { |
| 145 | return nullptr; |
| 146 | } |
bungeman | 06ca8ec | 2016-06-09 08:01:03 -0700 | [diff] [blame] | 147 | return GrFragmentProcessor::MulOutputByInputAlpha(std::move(inner)); |
bsalomon@google.com | cf8fb1f | 2012-08-02 14:03:32 +0000 | [diff] [blame] | 148 | } |
| 149 | |
twiz@google.com | a5e65ec | 2012-08-02 15:15:16 +0000 | [diff] [blame] | 150 | #endif |
robertphillips@google.com | 76f9e93 | 2013-01-15 20:17:47 +0000 | [diff] [blame] | 151 | |
Matt Sarett | 6cc6ae75 | 2017-04-18 18:29:12 -0400 | [diff] [blame] | 152 | sk_sp<SkShader> SkTwoPointConicalGradient::onMakeColorSpace(SkColorSpaceXformer* xformer) const { |
| 153 | SkSTArray<8, SkColor> origColorsStorage(fColorCount); |
| 154 | SkSTArray<8, SkScalar> origPosStorage(fColorCount); |
| 155 | SkSTArray<8, SkColor> xformedColorsStorage(fColorCount); |
| 156 | SkColor* origColors = origColorsStorage.begin(); |
| 157 | SkScalar* origPos = fOrigPos ? origPosStorage.begin() : nullptr; |
| 158 | SkColor* xformedColors = xformedColorsStorage.begin(); |
| 159 | |
| 160 | // Flip if necessary |
| 161 | SkPoint center1 = fFlippedGrad ? fCenter2 : fCenter1; |
| 162 | SkPoint center2 = fFlippedGrad ? fCenter1 : fCenter2; |
| 163 | SkScalar radius1 = fFlippedGrad ? fRadius2 : fRadius1; |
| 164 | SkScalar radius2 = fFlippedGrad ? fRadius1 : fRadius2; |
| 165 | for (int i = 0; i < fColorCount; i++) { |
| 166 | origColors[i] = fFlippedGrad ? fOrigColors[fColorCount - i - 1] : fOrigColors[i]; |
| 167 | if (origPos) { |
| 168 | origPos[i] = fFlippedGrad ? 1.0f - fOrigPos[fColorCount - i - 1] : fOrigPos[i]; |
| 169 | } |
| 170 | } |
| 171 | |
| 172 | xformer->apply(xformedColors, origColors, fColorCount); |
| 173 | return SkGradientShader::MakeTwoPointConical(center1, radius1, center2, radius2, xformedColors, |
| 174 | origPos, fColorCount, fTileMode, fGradFlags, |
| 175 | &this->getLocalMatrix()); |
| 176 | } |
| 177 | |
| 178 | |
commit-bot@chromium.org | 0f10f7b | 2014-03-13 18:02:17 +0000 | [diff] [blame] | 179 | #ifndef SK_IGNORE_TO_STRING |
robertphillips@google.com | 76f9e93 | 2013-01-15 20:17:47 +0000 | [diff] [blame] | 180 | void SkTwoPointConicalGradient::toString(SkString* str) const { |
| 181 | str->append("SkTwoPointConicalGradient: ("); |
| 182 | |
| 183 | str->append("center1: ("); |
| 184 | str->appendScalar(fCenter1.fX); |
| 185 | str->append(", "); |
| 186 | str->appendScalar(fCenter1.fY); |
| 187 | str->append(") radius1: "); |
| 188 | str->appendScalar(fRadius1); |
| 189 | str->append(" "); |
| 190 | |
| 191 | str->append("center2: ("); |
| 192 | str->appendScalar(fCenter2.fX); |
| 193 | str->append(", "); |
| 194 | str->appendScalar(fCenter2.fY); |
| 195 | str->append(") radius2: "); |
| 196 | str->appendScalar(fRadius2); |
| 197 | str->append(" "); |
| 198 | |
| 199 | this->INHERITED::toString(str); |
| 200 | |
| 201 | str->append(")"); |
| 202 | } |
| 203 | #endif |
Florin Malita | 0bb0411 | 2017-06-27 14:35:50 -0400 | [diff] [blame] | 204 | |
Florin Malita | 50b2084 | 2017-07-29 19:08:28 -0400 | [diff] [blame^] | 205 | void SkTwoPointConicalGradient::appendGradientStages(SkArenaAlloc* alloc, SkRasterPipeline* p, |
| 206 | SkRasterPipeline* postPipeline) const { |
Florin Malita | a66ef2d | 2017-06-28 10:02:40 -0400 | [diff] [blame] | 207 | const auto dRadius = fRadius2 - fRadius1; |
| 208 | SkASSERT(dRadius >= 0); |
| 209 | |
Florin Malita | 9c2212f | 2017-07-29 18:23:10 -0400 | [diff] [blame] | 210 | if (fType == Type::kRadial) { |
Florin Malita | 0bb0411 | 2017-06-27 14:35:50 -0400 | [diff] [blame] | 211 | p->append(SkRasterPipeline::xy_to_radius); |
| 212 | |
| 213 | // Tiny twist: radial computes a t for [0, r2], but we want a t for [r1, r2]. |
Florin Malita | a66ef2d | 2017-06-28 10:02:40 -0400 | [diff] [blame] | 214 | auto scale = fRadius2 / dRadius; |
| 215 | auto bias = -fRadius1 / dRadius; |
Florin Malita | 0bb0411 | 2017-06-27 14:35:50 -0400 | [diff] [blame] | 216 | |
Mike Reed | 6b59bf4 | 2017-07-03 21:26:44 -0400 | [diff] [blame] | 217 | p->append_matrix(alloc, SkMatrix::Concat(SkMatrix::MakeTrans(bias, 0), |
| 218 | SkMatrix::MakeScale(scale, 1))); |
Florin Malita | 50b2084 | 2017-07-29 19:08:28 -0400 | [diff] [blame^] | 219 | return; |
Florin Malita | 0bb0411 | 2017-06-27 14:35:50 -0400 | [diff] [blame] | 220 | } |
| 221 | |
Florin Malita | 9c2212f | 2017-07-29 18:23:10 -0400 | [diff] [blame] | 222 | const auto dCenter = (fCenter1 - fCenter2).length(); |
Florin Malita | a66ef2d | 2017-06-28 10:02:40 -0400 | [diff] [blame] | 223 | |
| 224 | // Since we've squashed the centers into a unit vector, we must also scale |
| 225 | // all the coefficient variables by (1 / dCenter). |
| 226 | const auto coeffA = 1 - dRadius * dRadius / (dCenter * dCenter); |
Florin Malita | a66ef2d | 2017-06-28 10:02:40 -0400 | [diff] [blame] | 227 | auto* ctx = alloc->make<SkJumper_2PtConicalCtx>(); |
| 228 | ctx->fCoeffA = coeffA; |
| 229 | ctx->fInvCoeffA = 1 / coeffA; |
| 230 | ctx->fR0 = fRadius1 / dCenter; |
| 231 | ctx->fDR = dRadius / dCenter; |
| 232 | |
Florin Malita | 9026fe1 | 2017-06-29 11:03:45 -0400 | [diff] [blame] | 233 | // Is the solver guaranteed to not produce degenerates? |
| 234 | bool isWellBehaved = true; |
| 235 | |
Florin Malita | 2e40900 | 2017-06-28 14:46:54 -0400 | [diff] [blame] | 236 | if (SkScalarNearlyZero(coeffA)) { |
| 237 | // The focal point is on the edge of the end circle. |
| 238 | p->append(SkRasterPipeline::xy_to_2pt_conical_linear, ctx); |
Florin Malita | 9026fe1 | 2017-06-29 11:03:45 -0400 | [diff] [blame] | 239 | isWellBehaved = false; |
Florin Malita | 2e40900 | 2017-06-28 14:46:54 -0400 | [diff] [blame] | 240 | } else { |
Florin Malita | 9026fe1 | 2017-06-29 11:03:45 -0400 | [diff] [blame] | 241 | if (dCenter + fRadius1 > fRadius2) { |
| 242 | // The focal point is outside the end circle. |
| 243 | |
| 244 | // We want the larger root, per spec: |
| 245 | // "For all values of ω where r(ω) > 0, starting with the value of ω nearest |
| 246 | // to positive infinity and ending with the value of ω nearest to negative |
| 247 | // infinity, draw the circumference of the circle with radius r(ω) at position |
| 248 | // (x(ω), y(ω)), with the color at ω, but only painting on the parts of the |
| 249 | // bitmap that have not yet been painted on by earlier circles in this step for |
| 250 | // this rendering of the gradient." |
| 251 | // (https://html.spec.whatwg.org/multipage/canvas.html#dom-context-2d-createradialgradient) |
| 252 | p->append(fFlippedGrad ? SkRasterPipeline::xy_to_2pt_conical_quadratic_min |
| 253 | : SkRasterPipeline::xy_to_2pt_conical_quadratic_max, ctx); |
| 254 | isWellBehaved = false; |
| 255 | } else { |
| 256 | // The focal point is inside (well-behaved case). |
| 257 | p->append(SkRasterPipeline::xy_to_2pt_conical_quadratic_max, ctx); |
| 258 | } |
| 259 | } |
| 260 | |
| 261 | if (!isWellBehaved) { |
| 262 | p->append(SkRasterPipeline::mask_2pt_conical_degenerates, ctx); |
| 263 | postPipeline->append(SkRasterPipeline::apply_vector_mask, &ctx->fMask); |
Florin Malita | 2e40900 | 2017-06-28 14:46:54 -0400 | [diff] [blame] | 264 | } |
Florin Malita | 0bb0411 | 2017-06-27 14:35:50 -0400 | [diff] [blame] | 265 | } |