bsalomon | 848faf0 | 2014-07-11 10:01:02 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2014 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 | |
humper@google.com | 3aad3b0 | 2013-09-04 19:23:53 +0000 | [diff] [blame] | 8 | #include "GrBicubicEffect.h" |
egdaniel | 605dd0f | 2014-11-12 08:35:25 -0800 | [diff] [blame] | 9 | #include "GrInvariantOutput.h" |
brianosman | 54f30c1 | 2016-07-18 10:53:52 -0700 | [diff] [blame] | 10 | #include "glsl/GrGLSLColorSpaceXformHelper.h" |
egdaniel | 2d721d3 | 2015-11-11 13:06:05 -0800 | [diff] [blame] | 11 | #include "glsl/GrGLSLFragmentShaderBuilder.h" |
egdaniel | 018fb62 | 2015-10-28 07:26:40 -0700 | [diff] [blame] | 12 | #include "glsl/GrGLSLProgramDataManager.h" |
egdaniel | 7ea439b | 2015-12-03 09:20:44 -0800 | [diff] [blame] | 13 | #include "glsl/GrGLSLUniformHandler.h" |
Brian Salomon | 94efbf5 | 2016-11-29 13:43:05 -0500 | [diff] [blame] | 14 | #include "../private/GrGLSL.h" |
bsalomon | 848faf0 | 2014-07-11 10:01:02 -0700 | [diff] [blame] | 15 | |
egdaniel | 64c4728 | 2015-11-13 06:54:19 -0800 | [diff] [blame] | 16 | class GrGLBicubicEffect : public GrGLSLFragmentProcessor { |
humper@google.com | 3aad3b0 | 2013-09-04 19:23:53 +0000 | [diff] [blame] | 17 | public: |
robertphillips | 9cdb992 | 2016-02-03 12:25:40 -0800 | [diff] [blame] | 18 | void emitCode(EmitArgs&) override; |
humper@google.com | 3aad3b0 | 2013-09-04 19:23:53 +0000 | [diff] [blame] | 19 | |
Brian Salomon | 94efbf5 | 2016-11-29 13:43:05 -0500 | [diff] [blame] | 20 | static inline void GenKey(const GrProcessor& effect, const GrShaderCaps&, |
joshualitt | b0a8a37 | 2014-09-23 09:50:21 -0700 | [diff] [blame] | 21 | GrProcessorKeyBuilder* b) { |
brianosman | 54f30c1 | 2016-07-18 10:53:52 -0700 | [diff] [blame] | 22 | const GrBicubicEffect& bicubicEffect = effect.cast<GrBicubicEffect>(); |
| 23 | b->add32(GrTextureDomain::GLDomain::DomainKey(bicubicEffect.domain())); |
brianosman | 77320db | 2016-09-07 08:09:10 -0700 | [diff] [blame] | 24 | b->add32(GrColorSpaceXform::XformKey(bicubicEffect.colorSpaceXform())); |
commit-bot@chromium.org | 7d7f314 | 2013-12-16 15:18:11 +0000 | [diff] [blame] | 25 | } |
| 26 | |
wangyix | b1daa86 | 2015-08-18 11:29:31 -0700 | [diff] [blame] | 27 | protected: |
egdaniel | 018fb62 | 2015-10-28 07:26:40 -0700 | [diff] [blame] | 28 | void onSetData(const GrGLSLProgramDataManager&, const GrProcessor&) override; |
wangyix | b1daa86 | 2015-08-18 11:29:31 -0700 | [diff] [blame] | 29 | |
humper@google.com | 3aad3b0 | 2013-09-04 19:23:53 +0000 | [diff] [blame] | 30 | private: |
egdaniel | 018fb62 | 2015-10-28 07:26:40 -0700 | [diff] [blame] | 31 | typedef GrGLSLProgramDataManager::UniformHandle UniformHandle; |
humper@google.com | 3aad3b0 | 2013-09-04 19:23:53 +0000 | [diff] [blame] | 32 | |
commit-bot@chromium.org | 7d7f314 | 2013-12-16 15:18:11 +0000 | [diff] [blame] | 33 | UniformHandle fImageIncrementUni; |
brianosman | 54f30c1 | 2016-07-18 10:53:52 -0700 | [diff] [blame] | 34 | UniformHandle fColorSpaceXformUni; |
commit-bot@chromium.org | 7d7f314 | 2013-12-16 15:18:11 +0000 | [diff] [blame] | 35 | GrTextureDomain::GLDomain fDomain; |
humper@google.com | 3aad3b0 | 2013-09-04 19:23:53 +0000 | [diff] [blame] | 36 | |
egdaniel | 64c4728 | 2015-11-13 06:54:19 -0800 | [diff] [blame] | 37 | typedef GrGLSLFragmentProcessor INHERITED; |
humper@google.com | 3aad3b0 | 2013-09-04 19:23:53 +0000 | [diff] [blame] | 38 | }; |
| 39 | |
wangyix | 7c157a9 | 2015-07-22 15:08:53 -0700 | [diff] [blame] | 40 | void GrGLBicubicEffect::emitCode(EmitArgs& args) { |
brianosman | 54f30c1 | 2016-07-18 10:53:52 -0700 | [diff] [blame] | 41 | const GrBicubicEffect& bicubicEffect = args.fFp.cast<GrBicubicEffect>(); |
commit-bot@chromium.org | a34995e | 2013-10-23 05:42:03 +0000 | [diff] [blame] | 42 | |
egdaniel | 7ea439b | 2015-12-03 09:20:44 -0800 | [diff] [blame] | 43 | GrGLSLUniformHandler* uniformHandler = args.fUniformHandler; |
cdalton | 5e58cee | 2016-02-11 12:49:47 -0800 | [diff] [blame] | 44 | fImageIncrementUni = uniformHandler->addUniform(kFragment_GrShaderFlag, |
egdaniel | 7ea439b | 2015-12-03 09:20:44 -0800 | [diff] [blame] | 45 | kVec2f_GrSLType, kDefault_GrSLPrecision, |
| 46 | "ImageIncrement"); |
humper@google.com | 3aad3b0 | 2013-09-04 19:23:53 +0000 | [diff] [blame] | 47 | |
egdaniel | 7ea439b | 2015-12-03 09:20:44 -0800 | [diff] [blame] | 48 | const char* imgInc = uniformHandler->getUniformCStr(fImageIncrementUni); |
humper@google.com | 3aad3b0 | 2013-09-04 19:23:53 +0000 | [diff] [blame] | 49 | |
brianosman | 54f30c1 | 2016-07-18 10:53:52 -0700 | [diff] [blame] | 50 | GrGLSLColorSpaceXformHelper colorSpaceHelper(uniformHandler, bicubicEffect.colorSpaceXform(), |
| 51 | &fColorSpaceXformUni); |
| 52 | |
cdalton | 8528541 | 2016-02-18 12:37:07 -0800 | [diff] [blame] | 53 | GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder; |
bsalomon | 1a1aa93 | 2016-09-12 09:30:36 -0700 | [diff] [blame] | 54 | SkString coords2D = fragBuilder->ensureCoords2D(args.fTransformedCoords[0]); |
Brian Osman | a3fa2ef | 2017-01-06 16:13:06 +0000 | [diff] [blame^] | 55 | |
| 56 | /* |
| 57 | * Filter weights come from Don Mitchell & Arun Netravali's 'Reconstruction Filters in Computer |
| 58 | * Graphics', ACM SIGGRAPH Computer Graphics 22, 4 (Aug. 1988). |
| 59 | * ACM DL: http://dl.acm.org/citation.cfm?id=378514 |
| 60 | * Free : http://www.cs.utexas.edu/users/fussell/courses/cs384g/lectures/mitchell/Mitchell.pdf |
| 61 | * |
| 62 | * The authors define a family of cubic filters with two free parameters (B and C): |
| 63 | * |
| 64 | * { (12 - 9B - 6C)|x|^3 + (-18 + 12B + 6C)|x|^2 + (6 - 2B) if |x| < 1 |
| 65 | * k(x) = 1/6 { (-B - 6C)|x|^3 + (6B + 30C)|x|^2 + (-12B - 48C)|x| + (8B + 24C) if 1 <= |x| < 2 |
| 66 | * { 0 otherwise |
| 67 | * |
| 68 | * Various well-known cubic splines can be generated, and the authors select (1/3, 1/3) as their |
| 69 | * favorite overall spline - this is now commonly known as the Mitchell filter, and is the |
| 70 | * source of the specific weights below. |
| 71 | * |
| 72 | * This is GLSL, so the matrix is column-major (transposed from standard matrix notation). |
| 73 | */ |
| 74 | fragBuilder->codeAppend("mat4 kMitchellCoefficients = mat4(" |
| 75 | " 1.0 / 18.0, 16.0 / 18.0, 1.0 / 18.0, 0.0 / 18.0," |
| 76 | "-9.0 / 18.0, 0.0 / 18.0, 9.0 / 18.0, 0.0 / 18.0," |
| 77 | "15.0 / 18.0, -36.0 / 18.0, 27.0 / 18.0, -6.0 / 18.0," |
| 78 | "-7.0 / 18.0, 21.0 / 18.0, -21.0 / 18.0, 7.0 / 18.0);"); |
| 79 | fragBuilder->codeAppendf("vec2 coord = %s - %s * vec2(0.5);", coords2D.c_str(), imgInc); |
commit-bot@chromium.org | dec6150 | 2013-12-02 22:22:35 +0000 | [diff] [blame] | 80 | // We unnormalize the coord in order to determine our fractional offset (f) within the texel |
| 81 | // We then snap coord to a texel center and renormalize. The snap prevents cases where the |
| 82 | // starting coords are near a texel boundary and accumulations of imgInc would cause us to skip/ |
| 83 | // double hit a texel. |
Brian Osman | a3fa2ef | 2017-01-06 16:13:06 +0000 | [diff] [blame^] | 84 | fragBuilder->codeAppendf("coord /= %s;", imgInc); |
| 85 | fragBuilder->codeAppend("vec2 f = fract(coord);"); |
| 86 | fragBuilder->codeAppendf("coord = (coord - f + vec2(0.5)) * %s;", imgInc); |
| 87 | fragBuilder->codeAppend("vec4 wx = kMitchellCoefficients * vec4(1.0, f.x, f.x * f.x, f.x * f.x * f.x);"); |
| 88 | fragBuilder->codeAppend("vec4 wy = kMitchellCoefficients * vec4(1.0, f.y, f.y * f.y, f.y * f.y * f.y);"); |
| 89 | fragBuilder->codeAppend("vec4 rowColors[4];"); |
humper@google.com | 3aad3b0 | 2013-09-04 19:23:53 +0000 | [diff] [blame] | 90 | for (int y = 0; y < 4; ++y) { |
| 91 | for (int x = 0; x < 4; ++x) { |
| 92 | SkString coord; |
| 93 | coord.printf("coord + %s * vec2(%d, %d)", imgInc, x - 1, y - 1); |
commit-bot@chromium.org | 7d7f314 | 2013-12-16 15:18:11 +0000 | [diff] [blame] | 94 | SkString sampleVar; |
| 95 | sampleVar.printf("rowColors[%d]", x); |
egdaniel | a2e3e0f | 2015-11-19 07:23:45 -0800 | [diff] [blame] | 96 | fDomain.sampleTexture(fragBuilder, |
egdaniel | 7ea439b | 2015-12-03 09:20:44 -0800 | [diff] [blame] | 97 | args.fUniformHandler, |
Brian Salomon | 1edc5b9 | 2016-11-29 13:43:46 -0500 | [diff] [blame] | 98 | args.fShaderCaps, |
brianosman | 54f30c1 | 2016-07-18 10:53:52 -0700 | [diff] [blame] | 99 | bicubicEffect.domain(), |
egdaniel | a2e3e0f | 2015-11-19 07:23:45 -0800 | [diff] [blame] | 100 | sampleVar.c_str(), |
| 101 | coord, |
cdalton | 3f6f76f | 2016-04-11 12:18:09 -0700 | [diff] [blame] | 102 | args.fTexSamplers[0]); |
humper@google.com | 3aad3b0 | 2013-09-04 19:23:53 +0000 | [diff] [blame] | 103 | } |
egdaniel | 4ca2e60 | 2015-11-18 08:01:26 -0800 | [diff] [blame] | 104 | fragBuilder->codeAppendf( |
Brian Osman | a3fa2ef | 2017-01-06 16:13:06 +0000 | [diff] [blame^] | 105 | "vec4 s%d = wx.x * rowColors[0] + wx.y * rowColors[1] + wx.z * rowColors[2] + wx.w * rowColors[3];", |
| 106 | y); |
humper@google.com | 3aad3b0 | 2013-09-04 19:23:53 +0000 | [diff] [blame] | 107 | } |
Brian Osman | a3fa2ef | 2017-01-06 16:13:06 +0000 | [diff] [blame^] | 108 | SkString bicubicColor("(wy.x * s0 + wy.y * s1 + wy.z * s2 + wy.w * s3)"); |
brianosman | 54f30c1 | 2016-07-18 10:53:52 -0700 | [diff] [blame] | 109 | if (colorSpaceHelper.getXformMatrix()) { |
brianosman | 77320db | 2016-09-07 08:09:10 -0700 | [diff] [blame] | 110 | SkString xformedColor; |
| 111 | fragBuilder->appendColorGamutXform(&xformedColor, bicubicColor.c_str(), &colorSpaceHelper); |
| 112 | bicubicColor.swap(xformedColor); |
brianosman | 54f30c1 | 2016-07-18 10:53:52 -0700 | [diff] [blame] | 113 | } |
Brian Osman | a3fa2ef | 2017-01-06 16:13:06 +0000 | [diff] [blame^] | 114 | fragBuilder->codeAppendf("%s = %s;", |
egdaniel | 4ca2e60 | 2015-11-18 08:01:26 -0800 | [diff] [blame] | 115 | args.fOutputColor, (GrGLSLExpr4(bicubicColor.c_str()) * |
| 116 | GrGLSLExpr4(args.fInputColor)).c_str()); |
humper@google.com | 3aad3b0 | 2013-09-04 19:23:53 +0000 | [diff] [blame] | 117 | } |
| 118 | |
egdaniel | 018fb62 | 2015-10-28 07:26:40 -0700 | [diff] [blame] | 119 | void GrGLBicubicEffect::onSetData(const GrGLSLProgramDataManager& pdman, |
| 120 | const GrProcessor& processor) { |
joshualitt | b0a8a37 | 2014-09-23 09:50:21 -0700 | [diff] [blame] | 121 | const GrBicubicEffect& bicubicEffect = processor.cast<GrBicubicEffect>(); |
Brian Salomon | db4183d | 2016-11-17 12:48:40 -0500 | [diff] [blame] | 122 | GrTexture* texture = processor.textureSampler(0).texture(); |
humper@google.com | 3aad3b0 | 2013-09-04 19:23:53 +0000 | [diff] [blame] | 123 | float imageIncrement[2]; |
Brian Salomon | 0bbecb2 | 2016-11-17 11:38:22 -0500 | [diff] [blame] | 124 | imageIncrement[0] = 1.0f / texture->width(); |
| 125 | imageIncrement[1] = 1.0f / texture->height(); |
kkinnunen | 7510b22 | 2014-07-30 00:04:16 -0700 | [diff] [blame] | 126 | pdman.set2fv(fImageIncrementUni, 1, imageIncrement); |
Brian Salomon | 0bbecb2 | 2016-11-17 11:38:22 -0500 | [diff] [blame] | 127 | fDomain.setData(pdman, bicubicEffect.domain(), texture->origin()); |
brianosman | 54f30c1 | 2016-07-18 10:53:52 -0700 | [diff] [blame] | 128 | if (SkToBool(bicubicEffect.colorSpaceXform())) { |
brianosman | 5192475 | 2016-09-12 08:50:19 -0700 | [diff] [blame] | 129 | pdman.setSkMatrix44(fColorSpaceXformUni, bicubicEffect.colorSpaceXform()->srcToDst()); |
brianosman | 54f30c1 | 2016-07-18 10:53:52 -0700 | [diff] [blame] | 130 | } |
commit-bot@chromium.org | 7d7f314 | 2013-12-16 15:18:11 +0000 | [diff] [blame] | 131 | } |
| 132 | |
bsalomon | 4a33952 | 2015-10-06 08:40:50 -0700 | [diff] [blame] | 133 | GrBicubicEffect::GrBicubicEffect(GrTexture* texture, |
brianosman | 54f30c1 | 2016-07-18 10:53:52 -0700 | [diff] [blame] | 134 | sk_sp<GrColorSpaceXform> colorSpaceXform, |
humper@google.com | 3aad3b0 | 2013-09-04 19:23:53 +0000 | [diff] [blame] | 135 | const SkMatrix &matrix, |
commit-bot@chromium.org | bc91fd7 | 2013-12-10 12:53:39 +0000 | [diff] [blame] | 136 | const SkShader::TileMode tileModes[2]) |
Brian Osman | 0857527 | 2016-12-21 15:26:37 -0500 | [diff] [blame] | 137 | : INHERITED(texture, std::move(colorSpaceXform), matrix, |
Brian Salomon | 514baff | 2016-11-17 15:17:07 -0500 | [diff] [blame] | 138 | GrSamplerParams(tileModes, GrSamplerParams::kNone_FilterMode)) |
Brian Osman | 0857527 | 2016-12-21 15:26:37 -0500 | [diff] [blame] | 139 | , fDomain(GrTextureDomain::IgnoredDomain()) { |
joshualitt | eb2a676 | 2014-12-04 11:35:33 -0800 | [diff] [blame] | 140 | this->initClassID<GrBicubicEffect>(); |
commit-bot@chromium.org | 7d7f314 | 2013-12-16 15:18:11 +0000 | [diff] [blame] | 141 | } |
| 142 | |
bsalomon | 4a33952 | 2015-10-06 08:40:50 -0700 | [diff] [blame] | 143 | GrBicubicEffect::GrBicubicEffect(GrTexture* texture, |
brianosman | 54f30c1 | 2016-07-18 10:53:52 -0700 | [diff] [blame] | 144 | sk_sp<GrColorSpaceXform> colorSpaceXform, |
commit-bot@chromium.org | 7d7f314 | 2013-12-16 15:18:11 +0000 | [diff] [blame] | 145 | const SkMatrix &matrix, |
| 146 | const SkRect& domain) |
Brian Osman | 0857527 | 2016-12-21 15:26:37 -0500 | [diff] [blame] | 147 | : INHERITED(texture, std::move(colorSpaceXform), matrix, |
Brian Salomon | 514baff | 2016-11-17 15:17:07 -0500 | [diff] [blame] | 148 | GrSamplerParams(SkShader::kClamp_TileMode, GrSamplerParams::kNone_FilterMode)) |
Brian Osman | 0857527 | 2016-12-21 15:26:37 -0500 | [diff] [blame] | 149 | , fDomain(domain, GrTextureDomain::kClamp_Mode) { |
joshualitt | eb2a676 | 2014-12-04 11:35:33 -0800 | [diff] [blame] | 150 | this->initClassID<GrBicubicEffect>(); |
humper@google.com | 3aad3b0 | 2013-09-04 19:23:53 +0000 | [diff] [blame] | 151 | } |
| 152 | |
| 153 | GrBicubicEffect::~GrBicubicEffect() { |
| 154 | } |
| 155 | |
Brian Salomon | 94efbf5 | 2016-11-29 13:43:05 -0500 | [diff] [blame] | 156 | void GrBicubicEffect::onGetGLSLProcessorKey(const GrShaderCaps& caps, |
egdaniel | 57d3b03 | 2015-11-13 11:57:27 -0800 | [diff] [blame] | 157 | GrProcessorKeyBuilder* b) const { |
joshualitt | eb2a676 | 2014-12-04 11:35:33 -0800 | [diff] [blame] | 158 | GrGLBicubicEffect::GenKey(*this, caps, b); |
| 159 | } |
| 160 | |
egdaniel | 57d3b03 | 2015-11-13 11:57:27 -0800 | [diff] [blame] | 161 | GrGLSLFragmentProcessor* GrBicubicEffect::onCreateGLSLInstance() const { |
robertphillips | 9cdb992 | 2016-02-03 12:25:40 -0800 | [diff] [blame] | 162 | return new GrGLBicubicEffect; |
humper@google.com | 3aad3b0 | 2013-09-04 19:23:53 +0000 | [diff] [blame] | 163 | } |
| 164 | |
bsalomon | 0e08fc1 | 2014-10-15 08:19:04 -0700 | [diff] [blame] | 165 | bool GrBicubicEffect::onIsEqual(const GrFragmentProcessor& sBase) const { |
joshualitt | 49586be | 2014-09-16 08:21:41 -0700 | [diff] [blame] | 166 | const GrBicubicEffect& s = sBase.cast<GrBicubicEffect>(); |
Brian Osman | 0857527 | 2016-12-21 15:26:37 -0500 | [diff] [blame] | 167 | return fDomain == s.fDomain; |
humper@google.com | 3aad3b0 | 2013-09-04 19:23:53 +0000 | [diff] [blame] | 168 | } |
| 169 | |
egdaniel | 605dd0f | 2014-11-12 08:35:25 -0800 | [diff] [blame] | 170 | void GrBicubicEffect::onComputeInvariantOutput(GrInvariantOutput* inout) const { |
commit-bot@chromium.org | 7d7f314 | 2013-12-16 15:18:11 +0000 | [diff] [blame] | 171 | // FIXME: Perhaps we can do better. |
joshualitt | 56995b5 | 2014-12-11 15:44:02 -0800 | [diff] [blame] | 172 | inout->mulByUnknownSingleComponent(); |
humper@google.com | 3aad3b0 | 2013-09-04 19:23:53 +0000 | [diff] [blame] | 173 | } |
| 174 | |
joshualitt | b0a8a37 | 2014-09-23 09:50:21 -0700 | [diff] [blame] | 175 | GR_DEFINE_FRAGMENT_PROCESSOR_TEST(GrBicubicEffect); |
humper@google.com | 3aad3b0 | 2013-09-04 19:23:53 +0000 | [diff] [blame] | 176 | |
bungeman | 06ca8ec | 2016-06-09 08:01:03 -0700 | [diff] [blame] | 177 | sk_sp<GrFragmentProcessor> GrBicubicEffect::TestCreate(GrProcessorTestData* d) { |
joshualitt | 0067ff5 | 2015-07-08 14:26:19 -0700 | [diff] [blame] | 178 | int texIdx = d->fRandom->nextBool() ? GrProcessorUnitTest::kSkiaPMTextureIdx : |
| 179 | GrProcessorUnitTest::kAlphaTextureIdx; |
Brian Osman | e2f732f | 2016-10-03 14:23:50 -0400 | [diff] [blame] | 180 | auto colorSpaceXform = GrTest::TestColorXform(d->fRandom); |
Brian Osman | 0857527 | 2016-12-21 15:26:37 -0500 | [diff] [blame] | 181 | static const SkShader::TileMode kClampClamp[] = |
| 182 | { SkShader::kClamp_TileMode, SkShader::kClamp_TileMode }; |
| 183 | return GrBicubicEffect::Make(d->fTextures[texIdx], colorSpaceXform, |
| 184 | GrCoordTransform::MakeDivByTextureWHMatrix(d->fTextures[texIdx]), |
| 185 | kClampClamp); |
humper@google.com | 3aad3b0 | 2013-09-04 19:23:53 +0000 | [diff] [blame] | 186 | } |
commit-bot@chromium.org | 9927bd3 | 2014-05-20 17:51:13 +0000 | [diff] [blame] | 187 | |
| 188 | ////////////////////////////////////////////////////////////////////////////// |
| 189 | |
| 190 | bool GrBicubicEffect::ShouldUseBicubic(const SkMatrix& matrix, |
Brian Salomon | 514baff | 2016-11-17 15:17:07 -0500 | [diff] [blame] | 191 | GrSamplerParams::FilterMode* filterMode) { |
commit-bot@chromium.org | 9927bd3 | 2014-05-20 17:51:13 +0000 | [diff] [blame] | 192 | if (matrix.isIdentity()) { |
Brian Salomon | 514baff | 2016-11-17 15:17:07 -0500 | [diff] [blame] | 193 | *filterMode = GrSamplerParams::kNone_FilterMode; |
commit-bot@chromium.org | 9927bd3 | 2014-05-20 17:51:13 +0000 | [diff] [blame] | 194 | return false; |
| 195 | } |
| 196 | |
| 197 | SkScalar scales[2]; |
| 198 | if (!matrix.getMinMaxScales(scales) || scales[0] < SK_Scalar1) { |
| 199 | // Bicubic doesn't handle arbitrary minimization well, as src texels can be skipped |
| 200 | // entirely, |
Brian Salomon | 514baff | 2016-11-17 15:17:07 -0500 | [diff] [blame] | 201 | *filterMode = GrSamplerParams::kMipMap_FilterMode; |
commit-bot@chromium.org | 9927bd3 | 2014-05-20 17:51:13 +0000 | [diff] [blame] | 202 | return false; |
| 203 | } |
| 204 | // At this point if scales[1] == SK_Scalar1 then the matrix doesn't do any scaling. |
| 205 | if (scales[1] == SK_Scalar1) { |
| 206 | if (matrix.rectStaysRect() && SkScalarIsInt(matrix.getTranslateX()) && |
| 207 | SkScalarIsInt(matrix.getTranslateY())) { |
Brian Salomon | 514baff | 2016-11-17 15:17:07 -0500 | [diff] [blame] | 208 | *filterMode = GrSamplerParams::kNone_FilterMode; |
commit-bot@chromium.org | 9927bd3 | 2014-05-20 17:51:13 +0000 | [diff] [blame] | 209 | } else { |
| 210 | // Use bilerp to handle rotation or fractional translation. |
Brian Salomon | 514baff | 2016-11-17 15:17:07 -0500 | [diff] [blame] | 211 | *filterMode = GrSamplerParams::kBilerp_FilterMode; |
commit-bot@chromium.org | 9927bd3 | 2014-05-20 17:51:13 +0000 | [diff] [blame] | 212 | } |
| 213 | return false; |
| 214 | } |
| 215 | // When we use the bicubic filtering effect each sample is read from the texture using |
| 216 | // nearest neighbor sampling. |
Brian Salomon | 514baff | 2016-11-17 15:17:07 -0500 | [diff] [blame] | 217 | *filterMode = GrSamplerParams::kNone_FilterMode; |
commit-bot@chromium.org | 9927bd3 | 2014-05-20 17:51:13 +0000 | [diff] [blame] | 218 | return true; |
| 219 | } |