287 lines
10 KiB
C++
287 lines
10 KiB
C++
/*
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* Copyright 2013 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "gm.h"
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#include "SkGradientShader.h"
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using namespace skiagm;
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struct GradData {
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int fCount;
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const SkColor* fColors;
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const SkScalar* fPos;
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};
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static const SkColor gColors[] = {
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SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorWHITE,
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};
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static const GradData gGradData[] = {
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{ 1, gColors, nullptr },
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{ 2, gColors, nullptr },
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{ 3, gColors, nullptr },
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{ 4, gColors, nullptr },
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};
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static SkShader* MakeLinear(const SkPoint pts[2], const GradData& data, SkShader::TileMode tm) {
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return SkGradientShader::CreateLinear(pts, data.fColors, data.fPos, data.fCount, tm);
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}
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static SkShader* MakeRadial(const SkPoint pts[2], const GradData& data, SkShader::TileMode tm) {
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SkPoint center;
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center.set(SkScalarAve(pts[0].fX, pts[1].fX),
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SkScalarAve(pts[0].fY, pts[1].fY));
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return SkGradientShader::CreateRadial(center, center.fX, data.fColors,
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data.fPos, data.fCount, tm);
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}
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static SkShader* MakeSweep(const SkPoint pts[2], const GradData& data, SkShader::TileMode) {
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SkPoint center;
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center.set(SkScalarAve(pts[0].fX, pts[1].fX),
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SkScalarAve(pts[0].fY, pts[1].fY));
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return SkGradientShader::CreateSweep(center.fX, center.fY, data.fColors, data.fPos, data.fCount);
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}
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static SkShader* Make2Radial(const SkPoint pts[2], const GradData& data, SkShader::TileMode tm) {
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SkPoint center0, center1;
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center0.set(SkScalarAve(pts[0].fX, pts[1].fX),
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SkScalarAve(pts[0].fY, pts[1].fY));
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center1.set(SkScalarInterp(pts[0].fX, pts[1].fX, SkIntToScalar(3)/5),
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SkScalarInterp(pts[0].fY, pts[1].fY, SkIntToScalar(1)/4));
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return SkGradientShader::CreateTwoPointConical(
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center1, (pts[1].fX - pts[0].fX) / 7,
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center0, (pts[1].fX - pts[0].fX) / 2,
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data.fColors, data.fPos, data.fCount, tm);
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}
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static SkShader* Make2Conical(const SkPoint pts[2], const GradData& data, SkShader::TileMode tm) {
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SkPoint center0, center1;
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SkScalar radius0 = (pts[1].fX - pts[0].fX) / 10;
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SkScalar radius1 = (pts[1].fX - pts[0].fX) / 3;
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center0.set(pts[0].fX + radius0, pts[0].fY + radius0);
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center1.set(pts[1].fX - radius1, pts[1].fY - radius1);
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return SkGradientShader::CreateTwoPointConical(center1, radius1,
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center0, radius0,
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data.fColors, data.fPos,
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data.fCount, tm);
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}
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typedef SkShader* (*GradMaker)(const SkPoint pts[2], const GradData& data, SkShader::TileMode tm);
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static const GradMaker gGradMakers[] = {
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MakeLinear, MakeRadial, MakeSweep, Make2Radial, Make2Conical,
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};
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///////////////////////////////////////////////////////////////////////////////
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class GradientsNoTextureGM : public GM {
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public:
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GradientsNoTextureGM(bool dither) : fDither(dither) {
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this->setBGColor(sk_tool_utils::color_to_565(0xFFDDDDDD));
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}
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protected:
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SkString onShortName() override {
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return SkString(fDither ? "gradients_no_texture" : "gradients_no_texture_nodither");
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}
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SkISize onISize() override { return SkISize::Make(640, 615); }
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void onDraw(SkCanvas* canvas) override {
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static const SkPoint kPts[2] = { { 0, 0 },
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{ SkIntToScalar(50), SkIntToScalar(50) } };
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static const SkShader::TileMode kTM = SkShader::kClamp_TileMode;
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SkRect kRect = { 0, 0, SkIntToScalar(50), SkIntToScalar(50) };
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SkPaint paint;
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paint.setAntiAlias(true);
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paint.setDither(fDither);
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canvas->translate(SkIntToScalar(20), SkIntToScalar(20));
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static const uint8_t kAlphas[] = { 0xff, 0x40 };
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for (size_t a = 0; a < SK_ARRAY_COUNT(kAlphas); ++a) {
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for (size_t i = 0; i < SK_ARRAY_COUNT(gGradData); ++i) {
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canvas->save();
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for (size_t j = 0; j < SK_ARRAY_COUNT(gGradMakers); ++j) {
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SkShader* shader = gGradMakers[j](kPts, gGradData[i], kTM);
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paint.setShader(shader)->unref();
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paint.setAlpha(kAlphas[a]);
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canvas->drawRect(kRect, paint);
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canvas->translate(0, SkIntToScalar(kRect.height() + 20));
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}
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canvas->restore();
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canvas->translate(SkIntToScalar(kRect.width() + 20), 0);
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}
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}
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}
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private:
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bool fDither;
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typedef GM INHERITED;
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};
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///////////////////////////////////////////////////////////////////////////////
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struct ColorPos {
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SkColor* fColors;
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SkScalar* fPos;
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int fCount;
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ColorPos() : fColors(nullptr), fPos(nullptr), fCount(0) {}
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~ColorPos() {
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delete[] fColors;
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delete[] fPos;
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}
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void construct(const SkColor colors[], const SkScalar pos[], int count) {
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fColors = new SkColor[count];
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memcpy(fColors, colors, count * sizeof(SkColor));
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if (pos) {
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fPos = new SkScalar[count];
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memcpy(fPos, pos, count * sizeof(SkScalar));
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fPos[0] = 0;
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fPos[count - 1] = 1;
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}
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fCount = count;
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}
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};
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static void make0(ColorPos* rec) {
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#if 0
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From http://jsfiddle.net/3fe2a/
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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%);
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height: 30px;
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#endif
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const SkColor colors[] = {
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0xFF22d1cd, 0xFF22d1cd, 0xFFdf4b37, 0xFFdf4b37, 0xFF22d1cd, 0xFF22d1cd, 0xFFe6de36, 0xFFe6de36,
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0xFF3267ff, 0xFF3267ff, 0xFF9d47d1, 0xFF9d47d1, 0xFF3267ff, 0xFF3267ff, 0xFF5cdd9d, 0xFF5cdd9d,
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0xFF3267ff, 0xFF3267ff, 0xFF9d47d1, 0xFF9d47d1, 0xFF3267ff, 0xFF3267ff, 0xFFe3d082, 0xFFe3d082
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};
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const double percent[] = {
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1, 0.9510157507590116, 2.9510157507590113, 23.695886056604927,
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25.695886056604927, 25.39321881940624, 27.39321881940624, 31.849399922570655,
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33.849399922570655, 44.57735802921938, 46.57735802921938, 53.27185850805876,
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55.27185850805876, 61.95718972227316, 63.95718972227316, 69.89166004442,
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71.89166004442, 74.45795382765857, 76.45795382765857, 82.78364610713776,
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84.78364610713776, 94.52743647737229, 96.52743647737229, 96.03934633331295,
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};
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const int N = SK_ARRAY_COUNT(percent);
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SkScalar pos[N];
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for (int i = 0; i < N; ++i) {
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pos[i] = SkDoubleToScalar(percent[i] / 100);
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}
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rec->construct(colors, pos, N);
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}
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static void make1(ColorPos* rec) {
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const SkColor colors[] = {
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SK_ColorBLACK, SK_ColorWHITE, SK_ColorBLACK, SK_ColorWHITE,
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SK_ColorBLACK, SK_ColorWHITE, SK_ColorBLACK, SK_ColorWHITE,
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SK_ColorBLACK,
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};
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rec->construct(colors, nullptr, SK_ARRAY_COUNT(colors));
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}
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static void make2(ColorPos* rec) {
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const SkColor colors[] = {
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SK_ColorBLACK, SK_ColorWHITE, SK_ColorBLACK, SK_ColorWHITE,
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SK_ColorBLACK, SK_ColorWHITE, SK_ColorBLACK, SK_ColorWHITE,
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SK_ColorBLACK,
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};
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const int N = SK_ARRAY_COUNT(colors);
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SkScalar pos[N];
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for (int i = 0; i < N; ++i) {
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pos[i] = SK_Scalar1 * i / (N - 1);
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}
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rec->construct(colors, pos, N);
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}
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static void make3(ColorPos* rec) {
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const SkColor colors[] = {
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SK_ColorRED, SK_ColorBLUE, SK_ColorBLUE, SK_ColorGREEN, SK_ColorGREEN, SK_ColorBLACK,
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};
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const SkScalar pos[] = {
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0, 0, 0.5f, 0.5, 1, 1,
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};
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rec->construct(colors, pos, SK_ARRAY_COUNT(colors));
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}
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class GradientsManyColorsGM : public GM {
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enum {
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W = 800,
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};
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SkAutoTUnref<SkShader> fShader;
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typedef void (*Proc)(ColorPos*);
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public:
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GradientsManyColorsGM(bool dither) : fDither(dither) {}
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protected:
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SkString onShortName() override {
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return SkString(fDither ? "gradients_many" : "gradients_many_nodither");
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}
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SkISize onISize() override { return SkISize::Make(880, 400); }
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void onDraw(SkCanvas* canvas) override {
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const Proc procs[] = {
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make0, make1, make2, make3,
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};
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const SkPoint pts[] = {
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{ 0, 0 },
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{ SkIntToScalar(W), 0 },
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};
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const SkRect r = SkRect::MakeWH(SkIntToScalar(W), 30);
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SkPaint paint;
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paint.setDither(fDither);
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canvas->translate(40, 20);
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for (int i = 0; i <= 8; ++i) {
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SkScalar x = r.width() * i / 8;
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canvas->drawLine(x, 0, x, 10000, paint);
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}
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// expand the drawing rect so we exercise clampping in the gradients
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const SkRect drawR = r.makeOutset(20, 0);
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for (size_t i = 0; i < SK_ARRAY_COUNT(procs); ++i) {
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ColorPos rec;
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procs[i](&rec);
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SkShader* s = SkGradientShader::CreateLinear(pts, rec.fColors, rec.fPos, rec.fCount,
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SkShader::kClamp_TileMode);
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paint.setShader(s)->unref();
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canvas->drawRect(drawR, paint);
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canvas->save();
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canvas->translate(r.centerX(), r.height() + 4);
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canvas->scale(-1, 1);
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canvas->translate(-r.centerX(), 0);
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canvas->drawRect(drawR, paint);
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canvas->restore();
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canvas->translate(0, r.height() + 2*r.height() + 8);
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}
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}
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private:
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bool fDither;
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typedef GM INHERITED;
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};
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///////////////////////////////////////////////////////////////////////////////
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DEF_GM(return new GradientsNoTextureGM(true);)
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DEF_GM(return new GradientsNoTextureGM(false);)
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DEF_GM(return new GradientsManyColorsGM(true);)
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DEF_GM(return new GradientsManyColorsGM(false);)
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