Inheritance diagram for GradientsSlide:

Public Member Functions
	GradientsSlide ()

void	drawUI ()

void	draw (SkCanvas *canvas) override

Public Member Functions inherited from Slide
virtual SkISize	getDimensions () const

virtual void	gpuTeardown ()

virtual bool	animate (double nanos)

virtual void	load (SkScalar winWidth, SkScalar winHeight)

virtual void	resize (SkScalar winWidth, SkScalar winHeight)

virtual void	unload ()

virtual bool	onChar (SkUnichar c)

virtual bool	onMouse (SkScalar x, SkScalar y, skui::InputState state, skui::ModifierKey modifiers)

virtual bool	onGetControls (SkMetaData *)

virtual void	onSetControls (const SkMetaData &)

const SkString &	getName ()

Public Member Functions inherited from SkRefCntBase
	SkRefCntBase ()

virtual	~SkRefCntBase ()

bool	unique () const

void	ref () const

void	unref () const

Additional Inherited Members
Protected Attributes inherited from Slide
SkString	fName

Detailed Description

Definition at line 19 of file GradientsSlide.cpp.

Constructor & Destructor Documentation

◆ GradientsSlide()

GradientsSlide::GradientsSlide ( )

inline

Definition at line 21 of file GradientsSlide.cpp.

                     {
        fName = "Gradients";
        fColors.push_back(SkColors::kBlue);
        fColors.push_back(SkColors::kYellow);
    }

Member Function Documentation

◆ draw()

void GradientsSlide::draw ( SkCanvas * canvas )

inlineoverridevirtual

Implements Slide.

Definition at line 61 of file GradientsSlide.cpp.

                                         {
        canvas->clear(SK_ColorGRAY);
 
        this->drawUI();
 
        SkPoint pts[2] = {{0, 0}, {256, 0}};
        SkRect r = {0, 0, 256, 32};
        SkPaint labelPaint;
        SkPaint paint;
        paint.setDither(fDither);
 
        canvas->save();
        canvas->translate(10, 10);
 
        using CS = SkGradientShader::Interpolation::ColorSpace;
        struct Config {
            CS fColorSpace;
            const char* fLabel;
        };
        static const Config kConfigs[] = {
            { CS::kDestination,         "Destination" },
            { CS::kSRGB,                "sRGB" },
            { CS::kSRGBLinear,          "Linear sRGB" },
            { CS::kLab,                 "CIELAB" },
            { CS::kOKLab,               "Oklab" },
            { CS::kOKLabGamutMap,       "OklabGamutMap" },
            { CS::kLCH,                 "LCH" },
            { CS::kOKLCH,               "Oklch" },
            { CS::kOKLCHGamutMap,       "OklchGamutMap" },
            { CS::kHSL,                 "HSL" },
            { CS::kHWB,                 "HWB" },
        };
        SkFont font = ToolUtils::DefaultFont();
 
        for (const Config& config : kConfigs) {
            fInterpolation.fColorSpace = config.fColorSpace;
 
            paint.setShader(SkGradientShader::MakeLinear(pts, fColors.data(),
                                                         SkColorSpace::MakeSRGB(), nullptr,
                                                         (int)fColors.size(), SkTileMode::kClamp,
                                                         fInterpolation, nullptr));
            canvas->drawRect(r, paint);
            canvas->drawSimpleText(config.fLabel, strlen(config.fLabel), SkTextEncoding::kUTF8,
                                   266, 20, font, labelPaint);
            canvas->translate(0, 42);
        }
        canvas->restore();
    }

◆ drawUI()

void GradientsSlide::drawUI ( )

inline

Definition at line 27 of file GradientsSlide.cpp.

                  {
        ImGui::Begin("Gradient");
 
        ImGui::Checkbox("Dither", &fDither);
 
        bool premul = static_cast<bool>(fInterpolation.fInPremul);
        ImGui::Checkbox("Premul", &premul);
        fInterpolation.fInPremul = static_cast<SkGradientShader::Interpolation::InPremul>(premul);
 
        int hm = static_cast<int>(fInterpolation.fHueMethod);
        ImGui::Combo("Hue Method", &hm, "Shorter\0Longer\0Increasing\0Decreasing\0\0");
        fInterpolation.fHueMethod = static_cast<SkGradientShader::Interpolation::HueMethod>(hm);
 
        int removeIdx = -1;
        for (int i = 0; i < (int)fColors.size(); ++i) {
            ImGui::PushID(i);
            if (ImGui::Button("X")) {
                removeIdx = i;
            }
            ImGui::SameLine();
            ImGui::ColorEdit4("##Color", fColors[i].vec());
            ImGui::PopID();
        }
        if (removeIdx >= 0 && fColors.size() > 2) {
            fColors.erase(fColors.begin() + removeIdx);
        }
 
        if (ImGui::Button("+")) {
            fColors.push_back(SkColors::kBlack);
        }
 
        ImGui::End();
    }

The documentation for this class was generated from the following file:

third_party/skia/tools/viewer/GradientsSlide.cpp