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- /*
- * Copyright 2013 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/SkCanvas.h"
- #include "include/core/SkColor.h"
- #include "include/core/SkPaint.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 <string.h>
- using namespace skiagm;
- struct GradData {
- int fCount;
- const SkColor* fColors;
- const SkScalar* fPos;
- };
- constexpr SkColor gColors[] = {
- SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorWHITE,
- };
- constexpr GradData gGradData[] = {
- { 1, gColors, nullptr },
- { 2, gColors, nullptr },
- { 3, gColors, nullptr },
- { 4, gColors, nullptr },
- };
- static sk_sp<SkShader> MakeLinear(const SkPoint pts[2], const GradData& data, SkTileMode tm) {
- return SkGradientShader::MakeLinear(pts, data.fColors, data.fPos, data.fCount, tm);
- }
- static sk_sp<SkShader> MakeRadial(const SkPoint pts[2], const GradData& data, SkTileMode tm) {
- 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);
- }
- static sk_sp<SkShader> MakeSweep(const SkPoint pts[2], const GradData& data, SkTileMode) {
- 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);
- }
- static sk_sp<SkShader> Make2Radial(const SkPoint pts[2], const GradData& data, SkTileMode tm) {
- 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);
- }
- static sk_sp<SkShader> Make2Conical(const SkPoint pts[2], const GradData& data, SkTileMode tm) {
- 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);
- }
- typedef sk_sp<SkShader> (*GradMaker)(const SkPoint pts[2], const GradData& data, SkTileMode tm);
- constexpr GradMaker gGradMakers[] = {
- MakeLinear, MakeRadial, MakeSweep, Make2Radial, Make2Conical,
- };
- ///////////////////////////////////////////////////////////////////////////////
- class GradientsNoTextureGM : public GM {
- public:
- GradientsNoTextureGM(bool dither) : fDither(dither) {
- this->setBGColor(0xFFDDDDDD);
- }
- protected:
- SkString onShortName() override {
- return SkString(fDither ? "gradients_no_texture" : "gradients_no_texture_nodither");
- }
- SkISize onISize() override { return SkISize::Make(640, 615); }
- void onDraw(SkCanvas* canvas) override {
- constexpr SkPoint kPts[2] = { { 0, 0 },
- { SkIntToScalar(50), SkIntToScalar(50) } };
- constexpr SkTileMode kTM = SkTileMode::kClamp;
- SkRect kRect = { 0, 0, SkIntToScalar(50), SkIntToScalar(50) };
- SkPaint paint;
- paint.setAntiAlias(true);
- paint.setDither(fDither);
- canvas->translate(SkIntToScalar(20), SkIntToScalar(20));
- constexpr uint8_t kAlphas[] = { 0xff, 0x40 };
- for (size_t a = 0; a < SK_ARRAY_COUNT(kAlphas); ++a) {
- for (size_t i = 0; i < SK_ARRAY_COUNT(gGradData); ++i) {
- canvas->save();
- for (size_t j = 0; j < SK_ARRAY_COUNT(gGradMakers); ++j) {
- paint.setShader(gGradMakers[j](kPts, gGradData[i], kTM));
- paint.setAlpha(kAlphas[a]);
- canvas->drawRect(kRect, paint);
- canvas->translate(0, SkIntToScalar(kRect.height() + 20));
- }
- canvas->restore();
- canvas->translate(SkIntToScalar(kRect.width() + 20), 0);
- }
- }
- }
- private:
- bool fDither;
- typedef GM INHERITED;
- };
- ///////////////////////////////////////////////////////////////////////////////
- struct ColorPos {
- SkColor* fColors;
- SkScalar* fPos;
- int fCount;
- ColorPos() : fColors(nullptr), fPos(nullptr), fCount(0) {}
- ~ColorPos() {
- delete[] fColors;
- delete[] fPos;
- }
- void construct(const SkColor colors[], const SkScalar pos[], int count) {
- fColors = new SkColor[count];
- memcpy(fColors, colors, count * sizeof(SkColor));
- if (pos) {
- fPos = new SkScalar[count];
- memcpy(fPos, pos, count * sizeof(SkScalar));
- fPos[0] = 0;
- fPos[count - 1] = 1;
- }
- fCount = count;
- }
- };
- static void make0(ColorPos* rec) {
- #if 0
- From http://jsfiddle.net/3fe2a/
- background-image: -webkit-linear-gradient(left, #22d1cd 1%, #22d1cd 0.9510157507590116%, #df4b37 2.9510157507590113%, #df4b37 23.695886056604927%, #22d1cd 25.695886056604927%, #22d1cd 25.39321881940624%, #e6de36 27.39321881940624%, #e6de36 31.849399922570655%, #3267ff 33.849399922570655%, #3267ff 44.57735802921938%, #9d47d1 46.57735802921938%, #9d47d1 53.27185850805876%, #3267ff 55.27185850805876%, #3267ff 61.95718972227316%, #5cdd9d 63.95718972227316%, #5cdd9d 69.89166004442%, #3267ff 71.89166004442%, #3267ff 74.45795382765857%, #9d47d1 76.45795382765857%, #9d47d1 82.78364610713776%, #3267ff 84.78364610713776%, #3267ff 94.52743647737229%, #e3d082 96.52743647737229%, #e3d082 96.03934633331295%);
- height: 30px;
- #endif
- const SkColor colors[] = {
- 0xFF22d1cd, 0xFF22d1cd, 0xFFdf4b37, 0xFFdf4b37, 0xFF22d1cd, 0xFF22d1cd, 0xFFe6de36, 0xFFe6de36,
- 0xFF3267ff, 0xFF3267ff, 0xFF9d47d1, 0xFF9d47d1, 0xFF3267ff, 0xFF3267ff, 0xFF5cdd9d, 0xFF5cdd9d,
- 0xFF3267ff, 0xFF3267ff, 0xFF9d47d1, 0xFF9d47d1, 0xFF3267ff, 0xFF3267ff, 0xFFe3d082, 0xFFe3d082
- };
- const double percent[] = {
- 1, 0.9510157507590116, 2.9510157507590113, 23.695886056604927,
- 25.695886056604927, 25.39321881940624, 27.39321881940624, 31.849399922570655,
- 33.849399922570655, 44.57735802921938, 46.57735802921938, 53.27185850805876,
- 55.27185850805876, 61.95718972227316, 63.95718972227316, 69.89166004442,
- 71.89166004442, 74.45795382765857, 76.45795382765857, 82.78364610713776,
- 84.78364610713776, 94.52743647737229, 96.52743647737229, 96.03934633331295,
- };
- const int N = SK_ARRAY_COUNT(percent);
- SkScalar pos[N];
- for (int i = 0; i < N; ++i) {
- pos[i] = SkDoubleToScalar(percent[i] / 100);
- }
- rec->construct(colors, pos, N);
- }
- static void make1(ColorPos* rec) {
- const SkColor colors[] = {
- SK_ColorBLACK, SK_ColorWHITE, SK_ColorBLACK, SK_ColorWHITE,
- SK_ColorBLACK, SK_ColorWHITE, SK_ColorBLACK, SK_ColorWHITE,
- SK_ColorBLACK,
- };
- rec->construct(colors, nullptr, SK_ARRAY_COUNT(colors));
- }
- static void make2(ColorPos* rec) {
- const SkColor colors[] = {
- SK_ColorBLACK, SK_ColorWHITE, SK_ColorBLACK, SK_ColorWHITE,
- SK_ColorBLACK, SK_ColorWHITE, SK_ColorBLACK, SK_ColorWHITE,
- SK_ColorBLACK,
- };
- const int N = SK_ARRAY_COUNT(colors);
- SkScalar pos[N];
- for (int i = 0; i < N; ++i) {
- pos[i] = SK_Scalar1 * i / (N - 1);
- }
- rec->construct(colors, pos, N);
- }
- static void make3(ColorPos* rec) {
- const SkColor colors[] = {
- SK_ColorRED, SK_ColorBLUE, SK_ColorBLUE, SK_ColorGREEN, SK_ColorGREEN, SK_ColorBLACK,
- };
- const SkScalar pos[] = {
- 0, 0, 0.5f, 0.5, 1, 1,
- };
- rec->construct(colors, pos, SK_ARRAY_COUNT(colors));
- }
- class GradientsManyColorsGM : public GM {
- enum {
- W = 800,
- };
- sk_sp<SkShader> fShader;
- typedef void (*Proc)(ColorPos*);
- public:
- GradientsManyColorsGM(bool dither) : fDither(dither) {}
- protected:
- SkString onShortName() override {
- return SkString(fDither ? "gradients_many" : "gradients_many_nodither");
- }
- SkISize onISize() override { return SkISize::Make(880, 400); }
- void onDraw(SkCanvas* canvas) override {
- const Proc procs[] = {
- make0, make1, make2, make3,
- };
- const SkPoint pts[] = {
- { 0, 0 },
- { SkIntToScalar(W), 0 },
- };
- const SkRect r = SkRect::MakeWH(SkIntToScalar(W), 30);
- SkPaint paint;
- paint.setDither(fDither);
- canvas->translate(40, 20);
- for (int i = 0; i <= 8; ++i) {
- SkScalar x = r.width() * i / 8;
- canvas->drawLine(x, 0, x, 10000, paint);
- }
- // expand the drawing rect so we exercise clampping in the gradients
- const SkRect drawR = r.makeOutset(20, 0);
- for (size_t i = 0; i < SK_ARRAY_COUNT(procs); ++i) {
- ColorPos rec;
- procs[i](&rec);
- paint.setShader(SkGradientShader::MakeLinear(pts, rec.fColors, rec.fPos, rec.fCount,
- SkTileMode::kClamp));
- canvas->drawRect(drawR, paint);
- canvas->save();
- canvas->translate(r.centerX(), r.height() + 4);
- canvas->scale(-1, 1);
- canvas->translate(-r.centerX(), 0);
- canvas->drawRect(drawR, paint);
- canvas->restore();
- canvas->translate(0, r.height() + 2*r.height() + 8);
- }
- }
- private:
- bool fDither;
- typedef GM INHERITED;
- };
- ///////////////////////////////////////////////////////////////////////////////
- DEF_GM(return new GradientsNoTextureGM(true);)
- DEF_GM(return new GradientsNoTextureGM(false);)
- DEF_GM(return new GradientsManyColorsGM(true);)
- DEF_GM(return new GradientsManyColorsGM(false);)
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