| /* |
| * Copyright 2011 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "gm/gm.h" |
| #include "include/core/SkBlendMode.h" |
| #include "include/core/SkCanvas.h" |
| #include "include/core/SkColor.h" |
| #include "include/core/SkColorSpace.h" |
| #include "include/core/SkMatrix.h" |
| #include "include/core/SkPaint.h" |
| #include "include/core/SkPicture.h" |
| #include "include/core/SkPictureRecorder.h" |
| #include "include/core/SkPoint.h" |
| #include "include/core/SkRect.h" |
| #include "include/core/SkRefCnt.h" |
| #include "include/core/SkScalar.h" |
| #include "include/core/SkShader.h" |
| #include "include/core/SkSize.h" |
| #include "include/core/SkString.h" |
| #include "include/core/SkTileMode.h" |
| #include "include/core/SkTypes.h" |
| #include "include/effects/SkGradientShader.h" |
| |
| #include <math.h> |
| |
| namespace { |
| |
| struct GradData { |
| int fCount; |
| const SkColor* fColors; |
| const SkColor4f* fColors4f; |
| const SkScalar* fPos; |
| }; |
| |
| constexpr SkColor gColors[] = { |
| SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorWHITE, SK_ColorBLACK |
| }; |
| constexpr SkColor4f gColors4f[] ={ |
| { 1.0f, 0.0f, 0.0f, 1.0f }, // Red |
| { 0.0f, 1.0f, 0.0f, 1.0f }, // Green |
| { 0.0f, 0.0f, 1.0f, 1.0f }, // Blue |
| { 1.0f, 1.0f, 1.0f, 1.0f }, // White |
| { 0.0f, 0.0f, 0.0f, 1.0f } // Black |
| }; |
| constexpr SkScalar gPos0[] = { 0, SK_Scalar1 }; |
| constexpr SkScalar gPos1[] = { SK_Scalar1/4, SK_Scalar1*3/4 }; |
| constexpr SkScalar gPos2[] = { |
| 0, SK_Scalar1/8, SK_Scalar1/2, SK_Scalar1*7/8, SK_Scalar1 |
| }; |
| |
| constexpr SkScalar gPosClamp[] = {0.0f, 0.0f, 1.0f, 1.0f}; |
| constexpr SkColor gColorClamp[] = { |
| SK_ColorRED, SK_ColorGREEN, SK_ColorGREEN, SK_ColorBLUE |
| }; |
| constexpr SkColor4f gColor4fClamp[] ={ |
| { 1.0f, 0.0f, 0.0f, 1.0f }, // Red |
| { 0.0f, 1.0f, 0.0f, 1.0f }, // Green |
| { 0.0f, 1.0f, 0.0f, 1.0f }, // Green |
| { 0.0f, 0.0f, 1.0f, 1.0f } // Blue |
| }; |
| constexpr GradData gGradData[] = { |
| { 2, gColors, gColors4f, nullptr }, |
| { 2, gColors, gColors4f, gPos0 }, |
| { 2, gColors, gColors4f, gPos1 }, |
| { 5, gColors, gColors4f, nullptr }, |
| { 5, gColors, gColors4f, gPos2 }, |
| { 4, gColorClamp, gColor4fClamp, gPosClamp } |
| }; |
| |
| static sk_sp<SkShader> MakeLinear(const SkPoint pts[2], const GradData& data, |
| SkTileMode tm, const SkMatrix& localMatrix) { |
| return SkGradientShader::MakeLinear(pts, data.fColors, data.fPos, data.fCount, tm, 0, |
| &localMatrix); |
| } |
| |
| static sk_sp<SkShader> MakeLinear4f(const SkPoint pts[2], const GradData& data, |
| SkTileMode tm, const SkMatrix& localMatrix) { |
| auto srgb = SkColorSpace::MakeSRGB(); |
| return SkGradientShader::MakeLinear(pts, data.fColors4f, srgb, data.fPos, data.fCount, tm, 0, |
| &localMatrix); |
| } |
| |
| static sk_sp<SkShader> MakeRadial(const SkPoint pts[2], const GradData& data, |
| SkTileMode tm, const SkMatrix& localMatrix) { |
| SkPoint center; |
| center.set(SkScalarAve(pts[0].fX, pts[1].fX), |
| SkScalarAve(pts[0].fY, pts[1].fY)); |
| return SkGradientShader::MakeRadial(center, center.fX, data.fColors, data.fPos, data.fCount, |
| tm, 0, &localMatrix); |
| } |
| |
| static sk_sp<SkShader> MakeRadial4f(const SkPoint pts[2], const GradData& data, |
| SkTileMode tm, const SkMatrix& localMatrix) { |
| SkPoint center; |
| center.set(SkScalarAve(pts[0].fX, pts[1].fX), |
| SkScalarAve(pts[0].fY, pts[1].fY)); |
| auto srgb = SkColorSpace::MakeSRGB(); |
| return SkGradientShader::MakeRadial(center, center.fX, data.fColors4f, srgb, data.fPos, |
| data.fCount, tm, 0, &localMatrix); |
| } |
| |
| static sk_sp<SkShader> MakeSweep(const SkPoint pts[2], const GradData& data, |
| SkTileMode, const SkMatrix& localMatrix) { |
| SkPoint center; |
| center.set(SkScalarAve(pts[0].fX, pts[1].fX), |
| SkScalarAve(pts[0].fY, pts[1].fY)); |
| return SkGradientShader::MakeSweep(center.fX, center.fY, data.fColors, data.fPos, data.fCount, |
| 0, &localMatrix); |
| } |
| |
| static sk_sp<SkShader> MakeSweep4f(const SkPoint pts[2], const GradData& data, |
| SkTileMode, const SkMatrix& localMatrix) { |
| SkPoint center; |
| center.set(SkScalarAve(pts[0].fX, pts[1].fX), |
| SkScalarAve(pts[0].fY, pts[1].fY)); |
| auto srgb = SkColorSpace::MakeSRGB(); |
| return SkGradientShader::MakeSweep(center.fX, center.fY, data.fColors4f, srgb, data.fPos, |
| data.fCount, 0, &localMatrix); |
| } |
| |
| static sk_sp<SkShader> Make2Radial(const SkPoint pts[2], const GradData& data, |
| SkTileMode tm, const SkMatrix& localMatrix) { |
| SkPoint center0, center1; |
| center0.set(SkScalarAve(pts[0].fX, pts[1].fX), |
| SkScalarAve(pts[0].fY, pts[1].fY)); |
| center1.set(SkScalarInterp(pts[0].fX, pts[1].fX, SkIntToScalar(3)/5), |
| SkScalarInterp(pts[0].fY, pts[1].fY, SkIntToScalar(1)/4)); |
| return SkGradientShader::MakeTwoPointConical(center1, (pts[1].fX - pts[0].fX) / 7, |
| center0, (pts[1].fX - pts[0].fX) / 2, |
| data.fColors, data.fPos, data.fCount, tm, |
| 0, &localMatrix); |
| } |
| |
| static sk_sp<SkShader> Make2Radial4f(const SkPoint pts[2], const GradData& data, |
| SkTileMode tm, const SkMatrix& localMatrix) { |
| SkPoint center0, center1; |
| center0.set(SkScalarAve(pts[0].fX, pts[1].fX), |
| SkScalarAve(pts[0].fY, pts[1].fY)); |
| center1.set(SkScalarInterp(pts[0].fX, pts[1].fX, SkIntToScalar(3) / 5), |
| SkScalarInterp(pts[0].fY, pts[1].fY, SkIntToScalar(1) / 4)); |
| auto srgb = SkColorSpace::MakeSRGB(); |
| return SkGradientShader::MakeTwoPointConical(center1, (pts[1].fX - pts[0].fX) / 7, |
| center0, (pts[1].fX - pts[0].fX) / 2, |
| data.fColors4f, srgb, data.fPos, data.fCount, tm, |
| 0, &localMatrix); |
| } |
| |
| static sk_sp<SkShader> Make2Conical(const SkPoint pts[2], const GradData& data, |
| SkTileMode tm, const SkMatrix& localMatrix) { |
| SkPoint center0, center1; |
| SkScalar radius0 = (pts[1].fX - pts[0].fX) / 10; |
| SkScalar radius1 = (pts[1].fX - pts[0].fX) / 3; |
| center0.set(pts[0].fX + radius0, pts[0].fY + radius0); |
| center1.set(pts[1].fX - radius1, pts[1].fY - radius1); |
| return SkGradientShader::MakeTwoPointConical(center1, radius1, center0, radius0, |
| data.fColors, data.fPos, |
| data.fCount, tm, 0, &localMatrix); |
| } |
| |
| static sk_sp<SkShader> Make2Conical4f(const SkPoint pts[2], const GradData& data, |
| SkTileMode tm, const SkMatrix& localMatrix) { |
| SkPoint center0, center1; |
| SkScalar radius0 = (pts[1].fX - pts[0].fX) / 10; |
| SkScalar radius1 = (pts[1].fX - pts[0].fX) / 3; |
| center0.set(pts[0].fX + radius0, pts[0].fY + radius0); |
| center1.set(pts[1].fX - radius1, pts[1].fY - radius1); |
| auto srgb = SkColorSpace::MakeSRGB(); |
| return SkGradientShader::MakeTwoPointConical(center1, radius1, center0, radius0, |
| data.fColors4f, srgb, data.fPos, |
| data.fCount, tm, 0, &localMatrix); |
| } |
| |
| typedef sk_sp<SkShader> (*GradMaker)(const SkPoint pts[2], const GradData& data, |
| SkTileMode tm, const SkMatrix& localMatrix); |
| constexpr GradMaker gGradMakers[] = { |
| MakeLinear, MakeRadial, MakeSweep, Make2Radial, Make2Conical |
| }; |
| constexpr GradMaker gGradMakers4f[] ={ |
| MakeLinear4f, MakeRadial4f, MakeSweep4f, Make2Radial4f, Make2Conical4f |
| }; |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| class GradientsGM : public skiagm::GM { |
| public: |
| GradientsGM(bool dither) : fDither(dither) {} |
| |
| protected: |
| const bool fDither; |
| |
| void onDraw(SkCanvas* canvas) override { |
| SkPoint pts[2] = { |
| { 0, 0 }, |
| { SkIntToScalar(100), SkIntToScalar(100) } |
| }; |
| SkTileMode tm = SkTileMode::kClamp; |
| SkRect r = { 0, 0, SkIntToScalar(100), SkIntToScalar(100) }; |
| SkPaint paint; |
| paint.setAntiAlias(true); |
| paint.setDither(fDither); |
| |
| canvas->translate(SkIntToScalar(20), SkIntToScalar(20)); |
| for (size_t i = 0; i < SK_ARRAY_COUNT(gGradData); i++) { |
| canvas->save(); |
| for (size_t j = 0; j < SK_ARRAY_COUNT(gGradMakers); j++) { |
| SkMatrix scale = SkMatrix::I(); |
| |
| if (i == 5) { // if the clamp case |
| scale.setScale(0.5f, 0.5f); |
| scale.postTranslate(25.f, 25.f); |
| } |
| |
| paint.setShader(gGradMakers[j](pts, gGradData[i], tm, scale)); |
| canvas->drawRect(r, paint); |
| canvas->translate(0, SkIntToScalar(120)); |
| } |
| canvas->restore(); |
| canvas->translate(SkIntToScalar(120), 0); |
| } |
| } |
| |
| private: |
| void onOnceBeforeDraw() override { this->setBGColor(0xFFDDDDDD); } |
| |
| SkString onShortName() override { |
| return SkString(fDither ? "gradients" : "gradients_nodither"); |
| } |
| |
| SkISize onISize() override { return {840, 815}; } |
| }; |
| DEF_GM( return new GradientsGM(true); ) |
| DEF_GM( return new GradientsGM(false); ) |
| |
| // Like the original gradients GM, but using the SkColor4f shader factories. Should be identical. |
| class Gradients4fGM : public skiagm::GM { |
| public: |
| Gradients4fGM(bool dither) : fDither(dither) {} |
| |
| private: |
| void onOnceBeforeDraw() override { this->setBGColor(0xFFDDDDDD); } |
| |
| SkString onShortName() override { |
| return SkString(fDither ? "gradients4f" : "gradients4f_nodither"); |
| } |
| |
| SkISize onISize() override { return {840, 815}; } |
| |
| void onDraw(SkCanvas* canvas) override { |
| SkPoint pts[2] ={ |
| { 0, 0 }, |
| { SkIntToScalar(100), SkIntToScalar(100) } |
| }; |
| SkTileMode tm = SkTileMode::kClamp; |
| SkRect r ={ 0, 0, SkIntToScalar(100), SkIntToScalar(100) }; |
| SkPaint paint; |
| paint.setAntiAlias(true); |
| paint.setDither(fDither); |
| |
| canvas->translate(SkIntToScalar(20), SkIntToScalar(20)); |
| for (size_t i = 0; i < SK_ARRAY_COUNT(gGradData); i++) { |
| canvas->save(); |
| for (size_t j = 0; j < SK_ARRAY_COUNT(gGradMakers4f); j++) { |
| SkMatrix scale = SkMatrix::I(); |
| |
| if (i == 5) { // if the clamp case |
| scale.setScale(0.5f, 0.5f); |
| scale.postTranslate(25.f, 25.f); |
| } |
| |
| paint.setShader(gGradMakers4f[j](pts, gGradData[i], tm, scale)); |
| canvas->drawRect(r, paint); |
| canvas->translate(0, SkIntToScalar(120)); |
| } |
| canvas->restore(); |
| canvas->translate(SkIntToScalar(120), 0); |
| } |
| } |
| |
| bool fDither; |
| }; |
| DEF_GM(return new Gradients4fGM(true); ) |
| DEF_GM(return new Gradients4fGM(false); ) |
| |
| // Based on the original gradient slide, but with perspective applied to the |
| // gradient shaders' local matrices |
| class GradientsLocalPerspectiveGM : public skiagm::GM { |
| public: |
| GradientsLocalPerspectiveGM(bool dither) : fDither(dither) { |
| this->setBGColor(0xFFDDDDDD); |
| } |
| |
| private: |
| SkString onShortName() override { |
| return SkString(fDither ? "gradients_local_perspective" : |
| "gradients_local_perspective_nodither"); |
| } |
| |
| SkISize onISize() override { return {840, 815}; } |
| |
| void onDraw(SkCanvas* canvas) override { |
| SkPoint pts[2] = { |
| { 0, 0 }, |
| { SkIntToScalar(100), SkIntToScalar(100) } |
| }; |
| SkTileMode tm = SkTileMode::kClamp; |
| SkRect r = { 0, 0, SkIntToScalar(100), SkIntToScalar(100) }; |
| SkPaint paint; |
| paint.setAntiAlias(true); |
| paint.setDither(fDither); |
| |
| canvas->translate(SkIntToScalar(20), SkIntToScalar(20)); |
| for (size_t i = 0; i < SK_ARRAY_COUNT(gGradData); i++) { |
| canvas->save(); |
| for (size_t j = 0; j < SK_ARRAY_COUNT(gGradMakers); j++) { |
| // apply an increasing y perspective as we move to the right |
| SkMatrix perspective; |
| perspective.setIdentity(); |
| perspective.setPerspY(SkIntToScalar(i+1) / 500); |
| perspective.setSkewX(SkIntToScalar(i+1) / 10); |
| |
| paint.setShader(gGradMakers[j](pts, gGradData[i], tm, perspective)); |
| canvas->drawRect(r, paint); |
| canvas->translate(0, SkIntToScalar(120)); |
| } |
| canvas->restore(); |
| canvas->translate(SkIntToScalar(120), 0); |
| } |
| } |
| |
| bool fDither; |
| }; |
| DEF_GM( return new GradientsLocalPerspectiveGM(true); ) |
| DEF_GM( return new GradientsLocalPerspectiveGM(false); ) |
| |
| // Based on the original gradient slide, but with perspective applied to |
| // the view matrix |
| class GradientsViewPerspectiveGM : public GradientsGM { |
| public: |
| GradientsViewPerspectiveGM(bool dither) : INHERITED(dither) { } |
| |
| private: |
| SkString onShortName() override { |
| return SkString(fDither ? "gradients_view_perspective" : |
| "gradients_view_perspective_nodither"); |
| } |
| |
| SkISize onISize() override { return {840, 500}; } |
| |
| void onDraw(SkCanvas* canvas) override { |
| SkMatrix perspective; |
| perspective.setIdentity(); |
| perspective.setPerspY(0.001f); |
| perspective.setSkewX(SkIntToScalar(8) / 25); |
| canvas->concat(perspective); |
| this->INHERITED::onDraw(canvas); |
| } |
| |
| private: |
| typedef GradientsGM INHERITED; |
| }; |
| DEF_GM( return new GradientsViewPerspectiveGM(true); ) |
| DEF_GM( return new GradientsViewPerspectiveGM(false); ) |
| |
| /* |
| Inspired by this <canvas> javascript, where we need to detect that we are not |
| solving a quadratic equation, but must instead solve a linear (since our X^2 |
| coefficient is 0) |
| |
| ctx.fillStyle = '#f00'; |
| ctx.fillRect(0, 0, 100, 50); |
| |
| var g = ctx.createRadialGradient(-80, 25, 70, 0, 25, 150); |
| g.addColorStop(0, '#f00'); |
| g.addColorStop(0.01, '#0f0'); |
| g.addColorStop(0.99, '#0f0'); |
| g.addColorStop(1, '#f00'); |
| ctx.fillStyle = g; |
| ctx.fillRect(0, 0, 100, 50); |
| */ |
| class GradientsDegenrate2PointGM : public skiagm::GM { |
| public: |
| GradientsDegenrate2PointGM(bool dither) : fDither(dither) {} |
| |
| private: |
| SkString onShortName() override { |
| return SkString(fDither ? "gradients_degenerate_2pt" : "gradients_degenerate_2pt_nodither"); |
| } |
| |
| SkISize onISize() override { return {320, 320}; } |
| |
| void onDraw(SkCanvas* canvas) override { |
| canvas->drawColor(SK_ColorBLUE); |
| |
| SkColor colors[] = { SK_ColorRED, SK_ColorGREEN, SK_ColorGREEN, SK_ColorRED }; |
| SkScalar pos[] = { 0, 0.01f, 0.99f, SK_Scalar1 }; |
| SkPoint c0; |
| c0.iset(-80, 25); |
| SkScalar r0 = SkIntToScalar(70); |
| SkPoint c1; |
| c1.iset(0, 25); |
| SkScalar r1 = SkIntToScalar(150); |
| SkPaint paint; |
| paint.setShader(SkGradientShader::MakeTwoPointConical(c0, r0, c1, r1, colors, |
| pos, SK_ARRAY_COUNT(pos), |
| SkTileMode::kClamp)); |
| paint.setDither(fDither); |
| canvas->drawPaint(paint); |
| } |
| |
| bool fDither; |
| }; |
| DEF_GM( return new GradientsDegenrate2PointGM(true); ) |
| DEF_GM( return new GradientsDegenrate2PointGM(false); ) |
| |
| /* bug.skia.org/517 |
| <canvas id="canvas"></canvas> |
| <script> |
| var c = document.getElementById("canvas"); |
| var ctx = c.getContext("2d"); |
| ctx.fillStyle = '#ff0'; |
| ctx.fillRect(0, 0, 100, 50); |
| |
| var g = ctx.createRadialGradient(200, 25, 20, 200, 25, 10); |
| g.addColorStop(0, '#0f0'); |
| g.addColorStop(0.003, '#f00'); // 0.004 makes this work |
| g.addColorStop(1, '#ff0'); |
| ctx.fillStyle = g; |
| ctx.fillRect(0, 0, 100, 50); |
| </script> |
| */ |
| |
| // should draw only green |
| DEF_SIMPLE_GM(small_color_stop, canvas, 100, 150) { |
| SkColor colors[] = { SK_ColorGREEN, SK_ColorRED, SK_ColorYELLOW }; |
| SkScalar pos[] = { 0, 0.003f, SK_Scalar1 }; // 0.004f makes this work |
| SkPoint c0 = { 200, 25 }; |
| SkScalar r0 = 20; |
| SkPoint c1 = { 200, 25 }; |
| SkScalar r1 = 10; |
| |
| SkPaint paint; |
| paint.setColor(SK_ColorYELLOW); |
| canvas->drawRect(SkRect::MakeWH(100, 150), paint); |
| paint.setShader(SkGradientShader::MakeTwoPointConical(c0, r0, c1, r1, colors, pos, |
| SK_ARRAY_COUNT(pos), |
| SkTileMode::kClamp)); |
| canvas->drawRect(SkRect::MakeWH(100, 150), paint); |
| } |
| |
| |
| /// Tests correctness of *optimized* codepaths in gradients. |
| |
| class ClampedGradientsGM : public skiagm::GM { |
| public: |
| ClampedGradientsGM(bool dither) : fDither(dither) {} |
| |
| private: |
| SkString onShortName() override { |
| return SkString(fDither ? "clamped_gradients" : "clamped_gradients_nodither"); |
| } |
| |
| SkISize onISize() override { return {640, 510}; } |
| |
| void onDraw(SkCanvas* canvas) override { |
| canvas->drawColor(0xFFDDDDDD); |
| |
| SkRect r = { 0, 0, SkIntToScalar(100), SkIntToScalar(300) }; |
| SkPaint paint; |
| paint.setDither(fDither); |
| paint.setAntiAlias(true); |
| |
| SkPoint center; |
| center.iset(0, 300); |
| canvas->translate(SkIntToScalar(20), SkIntToScalar(20)); |
| paint.setShader(SkGradientShader::MakeRadial( |
| SkPoint(center), |
| SkIntToScalar(200), gColors, nullptr, 5, |
| SkTileMode::kClamp)); |
| canvas->drawRect(r, paint); |
| } |
| |
| bool fDither; |
| }; |
| DEF_GM( return new ClampedGradientsGM(true); ) |
| DEF_GM( return new ClampedGradientsGM(false); ) |
| |
| /// Checks quality of large radial gradients, which may display |
| /// some banding. |
| |
| class RadialGradientGM : public skiagm::GM { |
| SkString onShortName() override { return SkString("radial_gradient"); } |
| |
| SkISize onISize() override { return {1280, 1280}; } |
| |
| void onDraw(SkCanvas* canvas) override { |
| const SkISize dim = this->getISize(); |
| |
| canvas->drawColor(0xFF000000); |
| |
| SkPaint paint; |
| paint.setDither(true); |
| SkPoint center; |
| center.set(SkIntToScalar(dim.width())/2, SkIntToScalar(dim.height())/2); |
| SkScalar radius = SkIntToScalar(dim.width())/2; |
| const SkColor colors[] = { 0x7f7f7f7f, 0x7f7f7f7f, 0xb2000000 }; |
| const SkScalar pos[] = { 0.0f, |
| 0.35f, |
| 1.0f }; |
| paint.setShader(SkGradientShader::MakeRadial(center, radius, colors, pos, |
| SK_ARRAY_COUNT(pos), |
| SkTileMode::kClamp)); |
| SkRect r = { |
| 0, 0, SkIntToScalar(dim.width()), SkIntToScalar(dim.height()) |
| }; |
| canvas->drawRect(r, paint); |
| } |
| }; |
| DEF_GM( return new RadialGradientGM; ) |
| |
| class RadialGradient2GM : public skiagm::GM { |
| public: |
| RadialGradient2GM(bool dither) : fDither(dither) {} |
| |
| private: |
| SkString onShortName() override { |
| return SkString(fDither ? "radial_gradient2" : "radial_gradient2_nodither"); |
| } |
| |
| SkISize onISize() override { return {800, 400}; } |
| |
| // Reproduces the example given in bug 7671058. |
| void onDraw(SkCanvas* canvas) override { |
| SkPaint paint1, paint2, paint3; |
| paint1.setStyle(SkPaint::kFill_Style); |
| paint2.setStyle(SkPaint::kFill_Style); |
| paint3.setStyle(SkPaint::kFill_Style); |
| |
| const SkColor sweep_colors[] = |
| { 0xFFFF0000, 0xFFFFFF00, 0xFF00FF00, 0xFF00FFFF, 0xFF0000FF, 0xFFFF00FF, 0xFFFF0000 }; |
| const SkColor colors1[] = { 0xFFFFFFFF, 0x00000000 }; |
| const SkColor colors2[] = { 0xFF000000, 0x00000000 }; |
| |
| const SkScalar cx = 200, cy = 200, radius = 150; |
| SkPoint center; |
| center.set(cx, cy); |
| |
| // We can either interpolate endpoints and premultiply each point (default, more precision), |
| // or premultiply the endpoints first, avoiding the need to premultiply each point (cheap). |
| const uint32_t flags[] = { 0, SkGradientShader::kInterpolateColorsInPremul_Flag }; |
| |
| for (size_t i = 0; i < SK_ARRAY_COUNT(flags); i++) { |
| paint1.setShader(SkGradientShader::MakeSweep(cx, cy, sweep_colors, |
| nullptr, SK_ARRAY_COUNT(sweep_colors), |
| flags[i], nullptr)); |
| paint2.setShader(SkGradientShader::MakeRadial(center, radius, colors1, |
| nullptr, SK_ARRAY_COUNT(colors1), |
| SkTileMode::kClamp, |
| flags[i], nullptr)); |
| paint3.setShader(SkGradientShader::MakeRadial(center, radius, colors2, |
| nullptr, SK_ARRAY_COUNT(colors2), |
| SkTileMode::kClamp, |
| flags[i], nullptr)); |
| paint1.setDither(fDither); |
| paint2.setDither(fDither); |
| paint3.setDither(fDither); |
| |
| canvas->drawCircle(cx, cy, radius, paint1); |
| canvas->drawCircle(cx, cy, radius, paint3); |
| canvas->drawCircle(cx, cy, radius, paint2); |
| |
| canvas->translate(400, 0); |
| } |
| } |
| |
| private: |
| bool fDither; |
| |
| typedef GM INHERITED; |
| }; |
| DEF_GM( return new RadialGradient2GM(true); ) |
| DEF_GM( return new RadialGradient2GM(false); ) |
| |
| // Shallow radial (shows banding on raster) |
| class RadialGradient3GM : public skiagm::GM { |
| public: |
| RadialGradient3GM(bool dither) : fDither(dither) { } |
| |
| private: |
| SkString onShortName() override { |
| return SkString(fDither ? "radial_gradient3" : "radial_gradient3_nodither"); |
| } |
| |
| SkISize onISize() override { return {500, 500}; } |
| |
| bool runAsBench() const override { return true; } |
| |
| void onOnceBeforeDraw() override { |
| const SkPoint center = { 0, 0 }; |
| const SkScalar kRadius = 3000; |
| const SkColor gColors[] = { 0xFFFFFFFF, 0xFF000000 }; |
| fShader = SkGradientShader::MakeRadial(center, kRadius, gColors, nullptr, 2, |
| SkTileMode::kClamp); |
| } |
| |
| void onDraw(SkCanvas* canvas) override { |
| SkPaint paint; |
| paint.setShader(fShader); |
| paint.setDither(fDither); |
| canvas->drawRect(SkRect::MakeWH(500, 500), paint); |
| } |
| |
| private: |
| sk_sp<SkShader> fShader; |
| bool fDither; |
| |
| typedef GM INHERITED; |
| }; |
| DEF_GM( return new RadialGradient3GM(true); ) |
| DEF_GM( return new RadialGradient3GM(false); ) |
| |
| class RadialGradient4GM : public skiagm::GM { |
| public: |
| RadialGradient4GM(bool dither) : fDither(dither) { } |
| |
| private: |
| SkString onShortName() override { |
| return SkString(fDither ? "radial_gradient4" : "radial_gradient4_nodither"); |
| } |
| |
| SkISize onISize() override { return {500, 500}; } |
| |
| void onOnceBeforeDraw() override { |
| const SkPoint center = { 250, 250 }; |
| const SkScalar kRadius = 250; |
| const SkColor colors[] = { SK_ColorRED, SK_ColorRED, SK_ColorWHITE, SK_ColorWHITE, |
| SK_ColorRED }; |
| const SkScalar pos[] = { 0, .4f, .4f, .8f, .8f, 1 }; |
| fShader = SkGradientShader::MakeRadial(center, kRadius, colors, pos, |
| SK_ARRAY_COUNT(gColors), SkTileMode::kClamp); |
| } |
| |
| void onDraw(SkCanvas* canvas) override { |
| SkPaint paint; |
| paint.setAntiAlias(true); |
| paint.setDither(fDither); |
| paint.setShader(fShader); |
| canvas->drawRect(SkRect::MakeWH(500, 500), paint); |
| } |
| |
| private: |
| sk_sp<SkShader> fShader; |
| bool fDither; |
| |
| typedef GM INHERITED; |
| }; |
| DEF_GM( return new RadialGradient4GM(true); ) |
| DEF_GM( return new RadialGradient4GM(false); ) |
| |
| class LinearGradientGM : public skiagm::GM { |
| public: |
| LinearGradientGM(bool dither) : fDither(dither) { } |
| |
| private: |
| SkString onShortName() override { |
| return SkString(fDither ? "linear_gradient" : "linear_gradient_nodither"); |
| } |
| |
| const SkScalar kWidthBump = 30.f; |
| const SkScalar kHeight = 5.f; |
| const SkScalar kMinWidth = 540.f; |
| |
| SkISize onISize() override { return {500, 500}; } |
| |
| void onOnceBeforeDraw() override { |
| SkPoint pts[2] = { {0, 0}, {0, 0} }; |
| const SkColor colors[] = { SK_ColorWHITE, SK_ColorWHITE, 0xFF008200, 0xFF008200, |
| SK_ColorWHITE, SK_ColorWHITE }; |
| const SkScalar unitPos[] = { 0, 50, 70, 500, 540 }; |
| SkScalar pos[6]; |
| pos[5] = 1; |
| for (int index = 0; index < (int) SK_ARRAY_COUNT(fShader); ++index) { |
| pts[1].fX = 500.f + index * kWidthBump; |
| for (int inner = 0; inner < (int) SK_ARRAY_COUNT(unitPos); ++inner) { |
| pos[inner] = unitPos[inner] / (kMinWidth + index * kWidthBump); |
| } |
| fShader[index] = SkGradientShader::MakeLinear(pts, colors, pos, |
| SK_ARRAY_COUNT(gColors), SkTileMode::kClamp); |
| } |
| } |
| |
| void onDraw(SkCanvas* canvas) override { |
| SkPaint paint; |
| paint.setAntiAlias(true); |
| paint.setDither(fDither); |
| for (int index = 0; index < (int) SK_ARRAY_COUNT(fShader); ++index) { |
| paint.setShader(fShader[index]); |
| canvas->drawRect(SkRect::MakeLTRB(0, index * kHeight, kMinWidth + index * kWidthBump, |
| (index + 1) * kHeight), paint); |
| } |
| } |
| |
| private: |
| sk_sp<SkShader> fShader[100]; |
| bool fDither; |
| |
| typedef GM INHERITED; |
| }; |
| DEF_GM( return new LinearGradientGM(true); ) |
| DEF_GM( return new LinearGradientGM(false); ) |
| |
| class LinearGradientTinyGM : public skiagm::GM { |
| static constexpr uint32_t kFlags = 0; |
| |
| SkString onShortName() override { return SkString("linear_gradient_tiny"); } |
| |
| SkISize onISize() override { return {600, 500}; } |
| |
| void onDraw(SkCanvas* canvas) override { |
| const SkScalar kRectSize = 100; |
| const unsigned kStopCount = 3; |
| const SkColor colors[kStopCount] = { SK_ColorGREEN, SK_ColorRED, SK_ColorGREEN }; |
| const struct { |
| SkPoint pts[2]; |
| SkScalar pos[kStopCount]; |
| } configs[] = { |
| { { SkPoint::Make(0, 0), SkPoint::Make(10, 0) }, { 0, 0.999999f, 1 }}, |
| { { SkPoint::Make(0, 0), SkPoint::Make(10, 0) }, { 0, 0.000001f, 1 }}, |
| { { SkPoint::Make(0, 0), SkPoint::Make(10, 0) }, { 0, 0.999999999f, 1 }}, |
| { { SkPoint::Make(0, 0), SkPoint::Make(10, 0) }, { 0, 0.000000001f, 1 }}, |
| |
| { { SkPoint::Make(0, 0), SkPoint::Make(0, 10) }, { 0, 0.999999f, 1 }}, |
| { { SkPoint::Make(0, 0), SkPoint::Make(0, 10) }, { 0, 0.000001f, 1 }}, |
| { { SkPoint::Make(0, 0), SkPoint::Make(0, 10) }, { 0, 0.999999999f, 1 }}, |
| { { SkPoint::Make(0, 0), SkPoint::Make(0, 10) }, { 0, 0.000000001f, 1 }}, |
| |
| { { SkPoint::Make(0, 0), SkPoint::Make(0.00001f, 0) }, { 0, 0.5f, 1 }}, |
| { { SkPoint::Make(9.99999f, 0), SkPoint::Make(10, 0) }, { 0, 0.5f, 1 }}, |
| { { SkPoint::Make(0, 0), SkPoint::Make(0, 0.00001f) }, { 0, 0.5f, 1 }}, |
| { { SkPoint::Make(0, 9.99999f), SkPoint::Make(0, 10) }, { 0, 0.5f, 1 }}, |
| }; |
| |
| SkPaint paint; |
| for (unsigned i = 0; i < SK_ARRAY_COUNT(configs); ++i) { |
| SkAutoCanvasRestore acr(canvas, true); |
| paint.setShader(SkGradientShader::MakeLinear(configs[i].pts, colors, configs[i].pos, |
| kStopCount, SkTileMode::kClamp, |
| kFlags, nullptr)); |
| canvas->translate(kRectSize * ((i % 4) * 1.5f + 0.25f), |
| kRectSize * ((i / 4) * 1.5f + 0.25f)); |
| |
| canvas->drawRect(SkRect::MakeWH(kRectSize, kRectSize), paint); |
| } |
| } |
| }; |
| |
| DEF_GM( return new LinearGradientTinyGM; ) |
| } // namespace |
| |
| /////////////////////////////////////////////////////////////////////////////////////////////////// |
| |
| struct GradRun { |
| SkColor fColors[4]; |
| SkScalar fPos[4]; |
| int fCount; |
| }; |
| |
| #define SIZE 121 |
| |
| static sk_sp<SkShader> make_linear(const GradRun& run, SkTileMode mode) { |
| const SkPoint pts[] { { 30, 30 }, { SIZE - 30, SIZE - 30 } }; |
| return SkGradientShader::MakeLinear(pts, run.fColors, run.fPos, run.fCount, mode); |
| } |
| |
| static sk_sp<SkShader> make_radial(const GradRun& run, SkTileMode mode) { |
| const SkScalar half = SIZE * 0.5f; |
| return SkGradientShader::MakeRadial({half,half}, half - 10, run.fColors, run.fPos, |
| run.fCount, mode); |
| } |
| |
| static sk_sp<SkShader> make_conical(const GradRun& run, SkTileMode mode) { |
| const SkScalar half = SIZE * 0.5f; |
| const SkPoint center { half, half }; |
| return SkGradientShader::MakeTwoPointConical(center, 20, center, half - 10, |
| run.fColors, run.fPos, run.fCount, mode); |
| } |
| |
| static sk_sp<SkShader> make_sweep(const GradRun& run, SkTileMode) { |
| const SkScalar half = SIZE * 0.5f; |
| return SkGradientShader::MakeSweep(half, half, run.fColors, run.fPos, run.fCount); |
| } |
| |
| /* |
| * Exercise duplicate color-stops, at the ends, and in the middle |
| * |
| * At the time of this writing, only Linear correctly deals with duplicates at the ends, |
| * and then only correctly on CPU backend. |
| */ |
| DEF_SIMPLE_GM(gradients_dup_color_stops, canvas, 704, 564) { |
| const SkColor preColor = 0xFFFF0000; // clamp color before start |
| const SkColor postColor = 0xFF0000FF; // clamp color after end |
| const SkColor color0 = 0xFF000000; |
| const SkColor color1 = 0xFF00FF00; |
| const SkColor badColor = 0xFF3388BB; // should never be seen, fills out fixed-size array |
| |
| const GradRun runs[] = { |
| { { color0, color1, badColor, badColor }, |
| { 0, 1, -1, -1 }, |
| 2, |
| }, |
| { { preColor, color0, color1, badColor }, |
| { 0, 0, 1, -1 }, |
| 3, |
| }, |
| { { color0, color1, postColor, badColor }, |
| { 0, 1, 1, -1 }, |
| 3, |
| }, |
| { { preColor, color0, color1, postColor }, |
| { 0, 0, 1, 1 }, |
| 4, |
| }, |
| { { color0, color0, color1, color1 }, |
| { 0, 0.5f, 0.5f, 1 }, |
| 4, |
| }, |
| }; |
| sk_sp<SkShader> (*factories[])(const GradRun&, SkTileMode) { |
| make_linear, make_radial, make_conical, make_sweep |
| }; |
| |
| const SkRect rect = SkRect::MakeWH(SIZE, SIZE); |
| const SkScalar dx = SIZE + 20; |
| const SkScalar dy = SIZE + 20; |
| const SkTileMode mode = SkTileMode::kClamp; |
| |
| SkPaint paint; |
| canvas->translate(10, 10 - dy); |
| for (auto factory : factories) { |
| canvas->translate(0, dy); |
| SkAutoCanvasRestore acr(canvas, true); |
| for (const auto& run : runs) { |
| paint.setShader(factory(run, mode)); |
| canvas->drawRect(rect, paint); |
| canvas->translate(dx, 0); |
| } |
| } |
| } |
| |
| static void draw_many_stops(SkCanvas* canvas) { |
| const unsigned kStopCount = 200; |
| const SkPoint pts[] = { {50, 50}, {450, 465}}; |
| |
| SkColor colors[kStopCount]; |
| for (unsigned i = 0; i < kStopCount; i++) { |
| switch (i % 5) { |
| case 0: colors[i] = SK_ColorRED; break; |
| case 1: colors[i] = SK_ColorGREEN; break; |
| case 2: colors[i] = SK_ColorGREEN; break; |
| case 3: colors[i] = SK_ColorBLUE; break; |
| case 4: colors[i] = SK_ColorRED; break; |
| } |
| } |
| |
| SkPaint p; |
| p.setShader(SkGradientShader::MakeLinear( |
| pts, colors, nullptr, SK_ARRAY_COUNT(colors), SkTileMode::kClamp)); |
| |
| canvas->drawRect(SkRect::MakeXYWH(0, 0, 500, 500), p); |
| } |
| |
| DEF_SIMPLE_GM(gradient_many_stops, canvas, 500, 500) { |
| draw_many_stops(canvas); |
| } |
| |
| static void draw_circle_shader(SkCanvas* canvas, SkScalar cx, SkScalar cy, SkScalar r, |
| sk_sp<SkShader> (*shaderFunc)()) { |
| SkPaint p; |
| p.setAntiAlias(true); |
| p.setShader(shaderFunc()); |
| canvas->drawCircle(cx, cy, r, p); |
| |
| p.setShader(nullptr); |
| p.setColor(SK_ColorGRAY); |
| p.setStyle(SkPaint::kStroke_Style); |
| p.setStrokeWidth(2); |
| canvas->drawCircle(cx, cy, r, p); |
| } |
| |
| DEF_SIMPLE_GM(fancy_gradients, canvas, 800, 300) { |
| draw_circle_shader(canvas, 150, 150, 100, []() -> sk_sp<SkShader> { |
| // Checkerboard using two linear gradients + picture shader. |
| SkScalar kTileSize = 80 / sqrtf(2); |
| SkColor colors1[] = { 0xff000000, 0xff000000, |
| 0xffffffff, 0xffffffff, |
| 0xff000000, 0xff000000 }; |
| SkColor colors2[] = { 0xff000000, 0xff000000, |
| 0x00000000, 0x00000000, |
| 0xff000000, 0xff000000 }; |
| SkScalar pos[] = { 0, .25f, .25f, .75f, .75f, 1 }; |
| static_assert(SK_ARRAY_COUNT(colors1) == SK_ARRAY_COUNT(pos), "color/pos size mismatch"); |
| static_assert(SK_ARRAY_COUNT(colors2) == SK_ARRAY_COUNT(pos), "color/pos size mismatch"); |
| |
| SkPictureRecorder recorder; |
| recorder.beginRecording(SkRect::MakeWH(kTileSize, kTileSize)); |
| |
| SkPaint p; |
| |
| SkPoint pts1[] = { { 0, 0 }, { kTileSize, kTileSize }}; |
| p.setShader(SkGradientShader::MakeLinear(pts1, colors1, pos, SK_ARRAY_COUNT(colors1), |
| SkTileMode::kClamp, 0, nullptr)); |
| recorder.getRecordingCanvas()->drawPaint(p); |
| |
| SkPoint pts2[] = { { 0, kTileSize }, { kTileSize, 0 }}; |
| p.setShader(SkGradientShader::MakeLinear(pts2, colors2, pos, SK_ARRAY_COUNT(colors2), |
| SkTileMode::kClamp, 0, nullptr)); |
| recorder.getRecordingCanvas()->drawPaint(p); |
| |
| SkMatrix m = SkMatrix::I(); |
| m.preRotate(45); |
| return recorder.finishRecordingAsPicture()->makeShader( |
| SkTileMode::kRepeat, |
| SkTileMode::kRepeat, &m, nullptr); |
| }); |
| |
| draw_circle_shader(canvas, 400, 150, 100, []() -> sk_sp<SkShader> { |
| // Checkerboard using a sweep gradient + picture shader. |
| SkScalar kTileSize = 80; |
| SkColor colors[] = { 0xff000000, 0xff000000, |
| 0xffffffff, 0xffffffff, |
| 0xff000000, 0xff000000, |
| 0xffffffff, 0xffffffff }; |
| SkScalar pos[] = { 0, .25f, .25f, .5f, .5f, .75f, .75f, 1 }; |
| static_assert(SK_ARRAY_COUNT(colors) == SK_ARRAY_COUNT(pos), "color/pos size mismatch"); |
| |
| SkPaint p; |
| p.setShader(SkGradientShader::MakeSweep(kTileSize / 2, kTileSize / 2, |
| colors, pos, SK_ARRAY_COUNT(colors), 0, nullptr)); |
| SkPictureRecorder recorder; |
| recorder.beginRecording(SkRect::MakeWH(kTileSize, kTileSize))->drawPaint(p); |
| |
| return recorder.finishRecordingAsPicture()->makeShader( |
| SkTileMode::kRepeat, |
| SkTileMode::kRepeat); |
| }); |
| |
| draw_circle_shader(canvas, 650, 150, 100, []() -> sk_sp<SkShader> { |
| // Dartboard using sweep + radial. |
| const SkColor a = 0xffffffff; |
| const SkColor b = 0xff000000; |
| SkColor colors[] = { a, a, b, b, a, a, b, b, a, a, b, b, a, a, b, b}; |
| SkScalar pos[] = { 0, .125f, .125f, .25f, .25f, .375f, .375f, .5f, .5f, |
| .625f, .625f, .75f, .75f, .875f, .875f, 1}; |
| static_assert(SK_ARRAY_COUNT(colors) == SK_ARRAY_COUNT(pos), "color/pos size mismatch"); |
| |
| SkPoint center = { 650, 150 }; |
| sk_sp<SkShader> sweep1 = SkGradientShader::MakeSweep(center.x(), center.y(), colors, pos, |
| SK_ARRAY_COUNT(colors), 0, nullptr); |
| SkMatrix m = SkMatrix::I(); |
| m.preRotate(22.5f, center.x(), center.y()); |
| sk_sp<SkShader> sweep2 = SkGradientShader::MakeSweep(center.x(), center.y(), colors, pos, |
| SK_ARRAY_COUNT(colors), 0, &m); |
| |
| sk_sp<SkShader> sweep(SkShaders::Blend(SkBlendMode::kExclusion, sweep1, sweep2)); |
| |
| SkScalar radialPos[] = { 0, .02f, .02f, .04f, .04f, .08f, .08f, .16f, .16f, .31f, .31f, |
| .62f, .62f, 1, 1, 1 }; |
| static_assert(SK_ARRAY_COUNT(colors) == SK_ARRAY_COUNT(radialPos), |
| "color/pos size mismatch"); |
| |
| return SkShaders::Blend(SkBlendMode::kExclusion, sweep, |
| SkGradientShader::MakeRadial(center, 100, colors, |
| radialPos, |
| SK_ARRAY_COUNT(radialPos), |
| SkTileMode::kClamp)); |
| }); |
| } |
| |
| DEF_SIMPLE_GM(sweep_tiling, canvas, 690, 512) { |
| static constexpr SkScalar size = 160; |
| static constexpr SkColor colors[] = { SK_ColorBLUE, SK_ColorYELLOW, SK_ColorGREEN }; |
| static constexpr SkScalar pos[] = { 0, .25f, .50f }; |
| static_assert(SK_ARRAY_COUNT(colors) == SK_ARRAY_COUNT(pos), "size mismatch"); |
| |
| static constexpr SkTileMode modes[] = { SkTileMode::kClamp, |
| SkTileMode::kRepeat, |
| SkTileMode::kMirror }; |
| |
| static const struct { |
| SkScalar start, end; |
| } angles[] = { |
| { -330, -270 }, |
| { 30, 90 }, |
| { 390, 450 }, |
| { -30, 800 }, |
| }; |
| |
| SkPaint p; |
| const SkRect r = SkRect::MakeWH(size, size); |
| |
| for (auto mode : modes) { |
| { |
| SkAutoCanvasRestore acr(canvas, true); |
| |
| for (auto angle : angles) { |
| p.setShader(SkGradientShader::MakeSweep(size / 2, size / 2, colors, pos, |
| SK_ARRAY_COUNT(colors), mode, |
| angle.start, angle.end, 0, nullptr)); |
| |
| canvas->drawRect(r, p); |
| canvas->translate(size * 1.1f, 0); |
| } |
| } |
| canvas->translate(0, size * 1.1f); |
| } |
| } |
| |
| // Exercises the special-case Ganesh gradient effects. |
| DEF_SIMPLE_GM(gradients_interesting, canvas, 640, 1300) { |
| static const SkColor colors2[] = { SK_ColorRED, SK_ColorBLUE }; |
| static const SkColor colors3[] = { SK_ColorRED, SK_ColorYELLOW, SK_ColorBLUE }; |
| static const SkColor colors4[] = { SK_ColorRED, SK_ColorYELLOW, SK_ColorYELLOW, SK_ColorBLUE }; |
| |
| static const SkScalar softRight[] = { 0, .999f, 1 }; // Based on Android launcher "clipping" |
| static const SkScalar hardLeft[] = { 0, 0, 1 }; |
| static const SkScalar hardRight[] = { 0, 1, 1 }; |
| static const SkScalar hardCenter[] = { 0, .5f, .5f, 1 }; |
| |
| static const struct { |
| const SkColor* colors; |
| const SkScalar* pos; |
| int count; |
| } configs[] = { |
| { colors2, nullptr, 2 }, // kTwo_ColorType |
| { colors3, nullptr, 3 }, // kThree_ColorType (simple) |
| { colors3, softRight, 3 }, // kThree_ColorType (tricky) |
| { colors3, hardLeft, 3 }, // kHardStopLeftEdged_ColorType |
| { colors3, hardRight, 3 }, // kHardStopRightEdged_ColorType |
| { colors4, hardCenter, 4 }, // kSingleHardStop_ColorType |
| }; |
| |
| static const SkTileMode modes[] = { |
| SkTileMode::kClamp, |
| SkTileMode::kRepeat, |
| SkTileMode::kMirror, |
| }; |
| |
| static constexpr SkScalar size = 200; |
| static const SkPoint pts[] = { { size / 3, size / 3 }, { size * 2 / 3, size * 2 / 3} }; |
| |
| SkPaint p; |
| for (const auto& cfg : configs) { |
| { |
| SkAutoCanvasRestore acr(canvas, true); |
| for (auto mode : modes) { |
| p.setShader(SkGradientShader::MakeLinear(pts, cfg.colors, cfg.pos, cfg.count, |
| mode)); |
| canvas->drawRect(SkRect::MakeWH(size, size), p); |
| canvas->translate(size * 1.1f, 0); |
| } |
| } |
| canvas->translate(0, size * 1.1f); |
| } |
| } |
