537 lines
18 KiB
C++
537 lines
18 KiB
C++
/*
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* Copyright 2011 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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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, SK_ColorBLACK
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};
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static const SkScalar gPos0[] = { 0, SK_Scalar1 };
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static const SkScalar gPos1[] = { SK_Scalar1/4, SK_Scalar1*3/4 };
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static const SkScalar gPos2[] = {
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0, SK_Scalar1/8, SK_Scalar1/2, SK_Scalar1*7/8, SK_Scalar1
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};
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static const SkScalar gPosClamp[] = {0.0f, 0.0f, 1.0f, 1.0f};
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static const SkColor gColorClamp[] = {
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SK_ColorRED, SK_ColorGREEN, SK_ColorGREEN, SK_ColorBLUE
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};
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static const GradData gGradData[] = {
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{ 2, gColors, NULL },
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{ 2, gColors, gPos0 },
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{ 2, gColors, gPos1 },
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{ 5, gColors, NULL },
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{ 5, gColors, gPos2 },
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{ 4, gColorClamp, gPosClamp }
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};
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static SkShader* MakeLinear(const SkPoint pts[2], const GradData& data,
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SkShader::TileMode tm, const SkMatrix& localMatrix) {
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return SkGradientShader::CreateLinear(pts, data.fColors, data.fPos,
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data.fCount, tm, 0, &localMatrix);
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}
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static SkShader* MakeRadial(const SkPoint pts[2], const GradData& data,
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SkShader::TileMode tm, const SkMatrix& localMatrix) {
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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, 0, &localMatrix);
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}
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static SkShader* MakeSweep(const SkPoint pts[2], const GradData& data,
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SkShader::TileMode, const SkMatrix& localMatrix) {
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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,
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data.fPos, data.fCount, 0, &localMatrix);
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}
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static SkShader* Make2Radial(const SkPoint pts[2], const GradData& data,
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SkShader::TileMode tm, const SkMatrix& localMatrix) {
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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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0, &localMatrix);
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}
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static SkShader* Make2Conical(const SkPoint pts[2], const GradData& data,
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SkShader::TileMode tm, const SkMatrix& localMatrix) {
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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, 0, &localMatrix);
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}
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typedef SkShader* (*GradMaker)(const SkPoint pts[2], const GradData& data,
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SkShader::TileMode tm, const SkMatrix& localMatrix);
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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 GradientsGM : public GM {
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public:
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GradientsGM() {
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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() {
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return SkString("gradients");
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}
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virtual SkISize onISize() { return SkISize::Make(840, 815); }
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virtual void onDraw(SkCanvas* canvas) {
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SkPoint pts[2] = {
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{ 0, 0 },
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{ SkIntToScalar(100), SkIntToScalar(100) }
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};
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SkShader::TileMode tm = SkShader::kClamp_TileMode;
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SkRect r = { 0, 0, SkIntToScalar(100), SkIntToScalar(100) };
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SkPaint paint;
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paint.setAntiAlias(true);
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canvas->translate(SkIntToScalar(20), SkIntToScalar(20));
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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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SkMatrix scale = SkMatrix::I();
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if (i == 5) { // if the clamp case
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scale.setScale(0.5f, 0.5f);
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scale.postTranslate(25.f, 25.f);
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}
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SkShader* shader = gGradMakers[j](pts, gGradData[i], tm, scale);
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paint.setShader(shader);
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canvas->drawRect(r, paint);
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shader->unref();
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canvas->translate(0, SkIntToScalar(120));
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}
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canvas->restore();
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canvas->translate(SkIntToScalar(120), 0);
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}
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}
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private:
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typedef GM INHERITED;
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};
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DEF_GM( return new GradientsGM; )
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// Based on the original gradient slide, but with perspective applied to the
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// gradient shaders' local matrices
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class GradientsLocalPerspectiveGM : public GM {
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public:
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GradientsLocalPerspectiveGM() {
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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() {
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return SkString("gradients_local_perspective");
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}
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virtual SkISize onISize() { return SkISize::Make(840, 815); }
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virtual void onDraw(SkCanvas* canvas) {
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SkPoint pts[2] = {
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{ 0, 0 },
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{ SkIntToScalar(100), SkIntToScalar(100) }
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};
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SkShader::TileMode tm = SkShader::kClamp_TileMode;
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SkRect r = { 0, 0, SkIntToScalar(100), SkIntToScalar(100) };
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SkPaint paint;
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paint.setAntiAlias(true);
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canvas->translate(SkIntToScalar(20), SkIntToScalar(20));
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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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// apply an increasing y perspective as we move to the right
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SkMatrix perspective;
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perspective.setIdentity();
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perspective.setPerspY(SkIntToScalar(i+1) / 500);
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perspective.setSkewX(SkIntToScalar(i+1) / 10);
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SkShader* shader = gGradMakers[j](pts, gGradData[i], tm, perspective);
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paint.setShader(shader);
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canvas->drawRect(r, paint);
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shader->unref();
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canvas->translate(0, SkIntToScalar(120));
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}
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canvas->restore();
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canvas->translate(SkIntToScalar(120), 0);
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}
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}
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private:
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typedef GM INHERITED;
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};
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DEF_GM( return new GradientsLocalPerspectiveGM; )
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// Based on the original gradient slide, but with perspective applied to
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// the view matrix
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class GradientsViewPerspectiveGM : public GradientsGM {
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protected:
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SkString onShortName() {
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return SkString("gradients_view_perspective");
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}
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virtual SkISize onISize() { return SkISize::Make(840, 500); }
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virtual void onDraw(SkCanvas* canvas) {
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SkMatrix perspective;
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perspective.setIdentity();
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perspective.setPerspY(0.001f);
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perspective.setSkewX(SkIntToScalar(8) / 25);
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canvas->concat(perspective);
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INHERITED::onDraw(canvas);
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}
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private:
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typedef GradientsGM INHERITED;
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};
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DEF_GM( return new GradientsViewPerspectiveGM; )
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/*
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Inspired by this <canvas> javascript, where we need to detect that we are not
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solving a quadratic equation, but must instead solve a linear (since our X^2
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coefficient is 0)
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ctx.fillStyle = '#f00';
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ctx.fillRect(0, 0, 100, 50);
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var g = ctx.createRadialGradient(-80, 25, 70, 0, 25, 150);
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g.addColorStop(0, '#f00');
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g.addColorStop(0.01, '#0f0');
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g.addColorStop(0.99, '#0f0');
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g.addColorStop(1, '#f00');
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ctx.fillStyle = g;
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ctx.fillRect(0, 0, 100, 50);
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*/
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class GradientsDegenrate2PointGM : public GM {
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public:
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GradientsDegenrate2PointGM() {}
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protected:
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SkString onShortName() {
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return SkString("gradients_degenerate_2pt");
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}
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virtual SkISize onISize() { return SkISize::Make(320, 320); }
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void drawBG(SkCanvas* canvas) {
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canvas->drawColor(SK_ColorBLUE);
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}
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virtual void onDraw(SkCanvas* canvas) {
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this->drawBG(canvas);
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SkColor colors[] = { SK_ColorRED, SK_ColorGREEN, SK_ColorGREEN, SK_ColorRED };
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SkScalar pos[] = { 0, 0.01f, 0.99f, SK_Scalar1 };
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SkPoint c0;
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c0.iset(-80, 25);
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SkScalar r0 = SkIntToScalar(70);
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SkPoint c1;
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c1.iset(0, 25);
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SkScalar r1 = SkIntToScalar(150);
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SkShader* s = SkGradientShader::CreateTwoPointConical(c0, r0, c1, r1, colors,
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pos, SK_ARRAY_COUNT(pos),
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SkShader::kClamp_TileMode);
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SkPaint paint;
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paint.setShader(s)->unref();
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canvas->drawPaint(paint);
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}
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private:
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typedef GM INHERITED;
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};
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DEF_GM( return new GradientsDegenrate2PointGM; )
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/// Tests correctness of *optimized* codepaths in gradients.
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class ClampedGradientsGM : public GM {
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public:
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ClampedGradientsGM() {}
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protected:
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SkString onShortName() { return SkString("clamped_gradients"); }
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virtual SkISize onISize() { return SkISize::Make(640, 510); }
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void drawBG(SkCanvas* canvas) {
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canvas->drawColor(sk_tool_utils::color_to_565(0xFFDDDDDD));
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}
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virtual void onDraw(SkCanvas* canvas) {
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this->drawBG(canvas);
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SkRect r = { 0, 0, SkIntToScalar(100), SkIntToScalar(300) };
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SkPaint paint;
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paint.setAntiAlias(true);
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SkPoint center;
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center.iset(0, 300);
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canvas->translate(SkIntToScalar(20), SkIntToScalar(20));
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SkShader* shader = SkGradientShader::CreateRadial(
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SkPoint(center),
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SkIntToScalar(200), gColors, NULL, 5,
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SkShader::kClamp_TileMode);
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paint.setShader(shader);
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canvas->drawRect(r, paint);
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shader->unref();
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}
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private:
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typedef GM INHERITED;
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};
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DEF_GM( return new ClampedGradientsGM; )
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/// Checks quality of large radial gradients, which may display
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/// some banding.
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class RadialGradientGM : public GM {
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public:
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RadialGradientGM() {}
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protected:
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SkString onShortName() override { return SkString("radial_gradient"); }
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SkISize onISize() override { return SkISize::Make(1280, 1280); }
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void drawBG(SkCanvas* canvas) {
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canvas->drawColor(0xFF000000);
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}
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void onDraw(SkCanvas* canvas) override {
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const SkISize dim = this->getISize();
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this->drawBG(canvas);
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SkPaint paint;
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paint.setDither(true);
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SkPoint center;
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center.set(SkIntToScalar(dim.width())/2, SkIntToScalar(dim.height())/2);
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SkScalar radius = SkIntToScalar(dim.width())/2;
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const SkColor colors[] = { 0x7f7f7f7f, 0x7f7f7f7f, 0xb2000000 };
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const SkScalar pos[] = { 0.0f,
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0.35f,
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1.0f };
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SkShader* shader =
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SkGradientShader::CreateRadial(center, radius, colors,
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pos, SK_ARRAY_COUNT(pos),
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SkShader::kClamp_TileMode);
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paint.setShader(shader)->unref();
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SkRect r = {
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0, 0, SkIntToScalar(dim.width()), SkIntToScalar(dim.height())
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};
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canvas->drawRect(r, paint);
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}
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private:
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typedef GM INHERITED;
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};
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DEF_GM( return new RadialGradientGM; )
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class RadialGradient2GM : public GM {
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public:
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RadialGradient2GM() {}
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protected:
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SkString onShortName() override { return SkString("radial_gradient2"); }
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SkISize onISize() override { return SkISize::Make(800, 400); }
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void drawBG(SkCanvas* canvas) {
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canvas->drawColor(0xFF000000);
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}
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// Reproduces the example given in bug 7671058.
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void onDraw(SkCanvas* canvas) override {
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SkPaint paint1, paint2, paint3;
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paint1.setStyle(SkPaint::kFill_Style);
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paint2.setStyle(SkPaint::kFill_Style);
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paint3.setStyle(SkPaint::kFill_Style);
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const SkColor sweep_colors[] =
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{ 0xFFFF0000, 0xFFFFFF00, 0xFF00FF00, 0xFF00FFFF, 0xFF0000FF, 0xFFFF00FF, 0xFFFF0000 };
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const SkColor colors1[] = { 0xFFFFFFFF, 0x00000000 };
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const SkColor colors2[] = { 0xFF000000, 0x00000000 };
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const SkScalar cx = 200, cy = 200, radius = 150;
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SkPoint center;
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center.set(cx, cy);
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// We can either interpolate endpoints and premultiply each point (default, more precision),
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// or premultiply the endpoints first, avoiding the need to premultiply each point (cheap).
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const uint32_t flags[] = { 0, SkGradientShader::kInterpolateColorsInPremul_Flag };
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for (size_t i = 0; i < SK_ARRAY_COUNT(flags); i++) {
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SkAutoTUnref<SkShader> sweep(
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SkGradientShader::CreateSweep(cx, cy, sweep_colors,
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NULL, SK_ARRAY_COUNT(sweep_colors),
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flags[i], NULL));
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SkAutoTUnref<SkShader> radial1(
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SkGradientShader::CreateRadial(center, radius, colors1,
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NULL, SK_ARRAY_COUNT(colors1),
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SkShader::kClamp_TileMode,
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flags[i], NULL));
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SkAutoTUnref<SkShader> radial2(
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SkGradientShader::CreateRadial(center, radius, colors2,
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NULL, SK_ARRAY_COUNT(colors2),
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SkShader::kClamp_TileMode,
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flags[i], NULL));
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paint1.setShader(sweep);
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paint2.setShader(radial1);
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paint3.setShader(radial2);
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canvas->drawCircle(cx, cy, radius, paint1);
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canvas->drawCircle(cx, cy, radius, paint3);
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canvas->drawCircle(cx, cy, radius, paint2);
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canvas->translate(400, 0);
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}
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}
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private:
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typedef GM INHERITED;
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};
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DEF_GM( return new RadialGradient2GM; )
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// Shallow radial (shows banding on raster)
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class RadialGradient3GM : public GM {
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SkAutoTUnref<SkShader> fShader;
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protected:
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SkString onShortName() override { return SkString("radial_gradient3"); }
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SkISize onISize() override { return SkISize::Make(500, 500); }
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bool runAsBench() const override { return true; }
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void onOnceBeforeDraw() override {
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const SkPoint center = { 0, 0 };
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const SkScalar kRadius = 3000;
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const SkColor gColors[] = { 0xFFFFFFFF, 0xFF000000 };
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fShader.reset(SkGradientShader::CreateRadial(center, kRadius, gColors, NULL, 2,
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SkShader::kClamp_TileMode));
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}
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void onDraw(SkCanvas* canvas) override {
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SkPaint paint;
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paint.setShader(fShader);
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canvas->drawRect(SkRect::MakeWH(500, 500), paint);
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}
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private:
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typedef GM INHERITED;
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};
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DEF_GM( return new RadialGradient3GM; )
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class RadialGradient4GM : public GM {
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SkAutoTUnref<SkShader> fShader;
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protected:
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SkString onShortName() override { return SkString("radial_gradient4"); }
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SkISize onISize() override { return SkISize::Make(500, 500); }
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void onOnceBeforeDraw() override {
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const SkPoint center = { 250, 250 };
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const SkScalar kRadius = 250;
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const SkColor colors[] = { SK_ColorRED, SK_ColorRED, SK_ColorWHITE, SK_ColorWHITE,
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SK_ColorRED };
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const SkScalar pos[] = { 0, .4f, .4f, .8f, .8f, 1 };
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fShader.reset(SkGradientShader::CreateRadial(center, kRadius, colors, pos,
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SK_ARRAY_COUNT(gColors), SkShader::kClamp_TileMode));
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}
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void onDraw(SkCanvas* canvas) override {
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SkPaint paint;
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paint.setAntiAlias(true);
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paint.setShader(fShader);
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canvas->drawRect(SkRect::MakeWH(500, 500), paint);
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}
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private:
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typedef GM INHERITED;
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};
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DEF_GM( return new RadialGradient4GM; )
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class LinearGradientGM : public GM {
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SkAutoTUnref<SkShader> fShader[100];
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protected:
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SkString onShortName() override { return SkString("linear_gradient"); }
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const SkScalar kWidthBump = 30.f;
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const SkScalar kHeight = 5.f;
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const SkScalar kMinWidth = 540.f;
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SkISize onISize() override { return SkISize::Make(500, 500); }
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void onOnceBeforeDraw() override {
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SkPoint pts[2] = { {0, 0}, {0, 0} };
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const SkColor colors[] = { SK_ColorWHITE, SK_ColorWHITE, 0xFF008200, 0xFF008200,
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SK_ColorWHITE, SK_ColorWHITE };
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const SkScalar unitPos[] = { 0, 50, 70, 500, 540 };
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SkScalar pos[6];
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pos[5] = 1;
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for (int index = 0; index < (int) SK_ARRAY_COUNT(fShader); ++index) {
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pts[1].fX = 500.f + index * kWidthBump;
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for (int inner = 0; inner < (int) SK_ARRAY_COUNT(unitPos); ++inner) {
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pos[inner] = unitPos[inner] / (kMinWidth + index * kWidthBump);
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}
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fShader[index].reset(SkGradientShader::CreateLinear(pts, colors, pos,
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SK_ARRAY_COUNT(gColors), SkShader::kClamp_TileMode));
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}
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}
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void onDraw(SkCanvas* canvas) override {
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SkPaint paint;
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paint.setAntiAlias(true);
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for (int index = 0; index < (int) SK_ARRAY_COUNT(fShader); ++index) {
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paint.setShader(fShader[index]);
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canvas->drawRect(SkRect::MakeLTRB(0, index * kHeight, kMinWidth + index * kWidthBump,
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(index + 1) * kHeight), paint);
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}
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}
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private:
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typedef GM INHERITED;
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};
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DEF_GM( return new LinearGradientGM; )
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}
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