LinearGradientRT Class Reference

Inheritance diagram for LinearGradientRT:

Public Member Functions
	LinearGradientRT ()
void	onDraw (SkCanvas *canvas) override
Public Member Functions inherited from RuntimeShaderGM
	RuntimeShaderGM (const char *name, SkISize size, const char *sksl, uint32_t flags=0)
void	onOnceBeforeDraw () override
bool	runAsBench () const override
SkString	getName () const override
SkISize	getISize () override
bool	onAnimate (double nanos) override
Public Member Functions inherited from skiagm::GM
	GM (SkColor backgroundColor=SK_ColorWHITE)
virtual	~GM ()
void	setMode (Mode mode)
Mode	getMode () const
DrawResult	gpuSetup (SkCanvas *, SkString *errorMsg, GraphiteTestContext *=nullptr)
void	gpuTeardown ()
void	onceBeforeDraw ()
DrawResult	draw (SkCanvas *canvas)
DrawResult	draw (SkCanvas *, SkString *errorMsg)
void	drawBackground (SkCanvas *)
DrawResult	drawContent (SkCanvas *canvas)
DrawResult	drawContent (SkCanvas *, SkString *errorMsg)
virtual SkISize	getISize ()=0
virtual SkString	getName () const =0
virtual bool	runAsBench () const
SkScalar	width ()
SkScalar	height ()
SkColor	getBGColor () const
void	setBGColor (SkColor)
void	drawSizeBounds (SkCanvas *, SkColor)
bool	animate (double)
virtual bool	onChar (SkUnichar)
bool	getControls (SkMetaData *controls)
void	setControls (const SkMetaData &controls)
virtual void	modifyGrContextOptions (GrContextOptions *)
virtual void	modifyGraphiteContextOptions (skgpu::graphite::ContextOptions *) const
virtual bool	isBazelOnly () const
virtual std::map< std::string, std::string >	getGoldKeys () const

Additional Inherited Members
Public Types inherited from skiagm::GM
enum	Mode { kGM_Mode , kSample_Mode , kBench_Mode }
using	DrawResult = skiagm::DrawResult
using	GraphiteTestContext = skiatest::graphite::GraphiteTestContext
Static Public Attributes inherited from skiagm::GM
static constexpr char	kErrorMsg_DrawSkippedGpuOnly []
Protected Member Functions inherited from skiagm::GM
virtual DrawResult	onGpuSetup (SkCanvas *, SkString *, GraphiteTestContext *)
virtual void	onGpuTeardown ()
virtual void	onOnceBeforeDraw ()
virtual DrawResult	onDraw (SkCanvas *, SkString *errorMsg)
virtual void	onDraw (SkCanvas *)
virtual bool	onAnimate (double)
virtual bool	onGetControls (SkMetaData *)
virtual void	onSetControls (const SkMetaData &)
GraphiteTestContext *	graphiteTestContext () const
Protected Attributes inherited from RuntimeShaderGM
SkString	fName
SkISize	fSize
uint32_t	fFlags
float	fSecs = 0.0f
SkString	fSkSL
sk_sp< SkRuntimeEffect >	fEffect

Detailed Description

Definition at line 593 of file runtimeshader.cpp.

Constructor & Destructor Documentation

LinearGradientRT()

LinearGradientRT::LinearGradientRT ( )

inline

Definition at line 595 of file runtimeshader.cpp.

                       : RuntimeShaderGM("linear_gradient_rt", {256 + 10, 128 + 15}, R"(
        layout(color) uniform vec4 in_colors0;
        layout(color) uniform vec4 in_colors1;
 
        vec4 main(vec2 p) {
            float t = p.x / 256;
            if (p.y < 32) {
                return mix(in_colors0, in_colors1, t);
            } else {
                vec3 linColor0 = toLinearSrgb(in_colors0.rgb);
                vec3 linColor1 = toLinearSrgb(in_colors1.rgb);
                vec3 linColor = mix(linColor0, linColor1, t);
                return fromLinearSrgb(linColor).rgb1;
            }
        }
    )") {}

Member Function Documentation

onDraw()

void LinearGradientRT::onDraw ( SkCanvas *  canvas )

inlineoverridevirtual

Reimplemented from skiagm::GM.

Definition at line 612 of file runtimeshader.cpp.

                                           {
        // Colors chosen to use values other than 0 and 1 - so that it's obvious if the conversion
        // intrinsics are doing anything. (Most transfer functions map 0 -> 0 and 1 -> 1).
        SkRuntimeShaderBuilder builder(fEffect);
        builder.uniform("in_colors0") = SkColor4f{0.75f, 0.25f, 0.0f, 1.0f};
        builder.uniform("in_colors1") = SkColor4f{0.0f, 0.75f, 0.25f, 1.0f};
        SkPaint paint;
        paint.setShader(builder.makeShader());
 
        canvas->save();
        canvas->clear(SK_ColorWHITE);
        canvas->translate(5, 5);
 
        // We draw everything twice. First to a surface with no color management, where the
        // intrinsics should do nothing (eg, the top bar should look the same in the top and bottom
        // halves). Then to an sRGB surface, where they should produce linearly interpolated
        // gradients (the bottom half of the second bar should be brighter than the top half).
        for (auto cs : {static_cast<SkColorSpace*>(nullptr), sk_srgb_singleton()}) {
            SkImageInfo info = SkImageInfo::Make(
                    256, 64, kN32_SkColorType, kPremul_SkAlphaType, sk_ref_sp(cs));
            auto surface = canvas->makeSurface(info);
            if (!surface) {
                surface = SkSurfaces::Raster(info);
            }
 
            surface->getCanvas()->drawRect({0, 0, 256, 64}, paint);
            canvas->drawImage(surface->makeImageSnapshot(), 0, 0);
            canvas->translate(0, 64 + 5);
        }
 
        canvas->restore();
    }

---

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

• third_party/skia/gm/runtimeshader.cpp