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skia2/gm/gradients.cpp
Brian Salomon 9fa47cc1c6 Make class members that are static constexpr also be inline. 
This is in prep for compiling with -std=c++14 and -Wno-c++17-extensions
when building with clang. Chrome has encountered problems with
third_party headers that are included both in Skia and other Chrome
sources that produce different code based on whether preprocessor macros
indicate a C++14 or C++17 compilation.

In C++17 they are already inline implicitly. When compiling with C++14
we can get linker errors unless they're explicitly inlined or defined
outside the class. With -Wno-c++17-extensions we can explicitly inline
them in the C++14 build because the warning that would be generated
about using a C++17 language extension is suppressed.

We cannot do this in public headers because we support compiling with
C++14 without suppressing the C++17 language extension warnings.

Bug: chromium:1257145
Change-Id: Iaf5f4c62a398f98dd4ca9b7dfb86f2d5cab21d66
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/457498
Reviewed-by: Ben Wagner <bungeman@google.com>
Reviewed-by: Herb Derby <herb@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
2021-10-11 16:22:59 +00:00

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/*
* 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:
using INHERITED = GradientsGM;
};
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;
using INHERITED = GM;
};
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 kColors[] = { 0xFFFFFFFF, 0xFF000000 };
fShader = SkGradientShader::MakeRadial(center, kRadius, kColors, 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;
using INHERITED = GM;
};
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;
using INHERITED = GM;
};
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;
using INHERITED = GM;
};
DEF_GM( return new LinearGradientGM(true); )
DEF_GM( return new LinearGradientGM(false); )
class LinearGradientTinyGM : public skiagm::GM {
inline 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,
SkFilterMode::kNearest, &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, SkFilterMode::kNearest);
});
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);
}
}
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