Viewer Class Reference

#include <Viewer.h>

Inheritance diagram for Viewer:

Classes
struct	DisplayFields
struct	SkFontFields
struct	SkPaintFields
struct	SkSurfacePropsFields

Public Member Functions
	Viewer (int argc, char **argv, void *platformData)
	~Viewer () override
void	onIdle () override
void	onBackendCreated () override
void	onPaint (SkSurface *) override
void	onResize (int width, int height) override
bool	onTouch (intptr_t owner, skui::InputState state, float x, float y) override
bool	onMouse (int x, int y, skui::InputState state, skui::ModifierKey modifiers) override
bool	onMouseWheel (float delta, int x, int y, skui::ModifierKey) override
void	onUIStateChanged (const SkString &stateName, const SkString &stateValue) override
bool	onKey (skui::Key key, skui::InputState state, skui::ModifierKey modifiers) override
bool	onChar (SkUnichar c, skui::ModifierKey modifiers) override
bool	onPinch (skui::InputState state, float scale, float x, float y) override
bool	onFling (skui::InputState state) override
Public Member Functions inherited from sk_app::Application
virtual	~Application ()

Static Public Member Functions
static GrContextOptions::ShaderErrorHandler *	ShaderErrorHandler ()
Static Public Member Functions inherited from sk_app::Application
static Application *	Create (int argc, char **argv, void *platformData)

Detailed Description

Definition at line 43 of file Viewer.h.

Constructor & Destructor Documentation

Viewer()

Viewer::Viewer	(	int	argc,
		char **	argv,
		void *	platformData
	)

Definition at line 493 of file Viewer.cpp.

    : fCurrentSlide(-1)
    , fRefresh(false)
    , fSaveToSKP(false)
    , fShowSlideDimensions(false)
    , fShowImGuiDebugWindow(false)
    , fShowSlidePicker(false)
    , fShowImGuiTestWindow(false)
    , fShowHistogramWindow(false)
    , fShowZoomWindow(false)
    , fZoomWindowFixed(false)
    , fZoomWindowLocation{0.0f, 0.0f}
    , fLastImage(nullptr)
    , fZoomUI(false)
    , fBackendType(sk_app::Window::kNativeGL_BackendType)
    , fColorMode(ColorMode::kLegacy)
    , fColorSpacePrimaries(gSrgbPrimaries)
    // Our UI can only tweak gamma (currently), so start out gamma-only
    , fColorSpaceTransferFn(SkNamedTransferFn::k2Dot2)
    , fApplyBackingScale(true)
    , fZoomLevel(0.0f)
    , fRotation(0.0f)
    , fOffset{0.5f, 0.5f}
    , fGestureDevice(GestureDevice::kNone)
    , fTiled(false)
    , fDrawTileBoundaries(false)
    , fTileScale{0.25f, 0.25f}
    , fPerspectiveMode(kPerspective_Off)
{
    SkGraphics::Init();
#if defined(SK_ENABLE_SVG)
    SkGraphics::SetOpenTypeSVGDecoderFactory(SkSVGOpenTypeSVGDecoder::Make);
#endif
    CodecUtils::RegisterAllAvailable();
 
    gGaneshPathRendererNames[GpuPathRenderers::kDefault] = "Default Path Renderers";
    gGaneshPathRendererNames[GpuPathRenderers::kAtlas] = "Atlas (tessellation)";
    gGaneshPathRendererNames[GpuPathRenderers::kTessellation] = "Tessellation";
    gGaneshPathRendererNames[GpuPathRenderers::kSmall] = "Small paths (cached sdf or alpha masks)";
    gGaneshPathRendererNames[GpuPathRenderers::kTriangulating] = "Triangulating";
    gGaneshPathRendererNames[GpuPathRenderers::kNone] = "Software masks";
 
    SkDebugf("Command line arguments: ");
    for (int i = 1; i < argc; ++i) {
        SkDebugf("%s ", argv[i]);
    }
    SkDebugf("\n");
 
    CommandLineFlags::Parse(argc, argv);
#ifdef SK_BUILD_FOR_ANDROID
    SetResourcePath("/data/local/tmp/resources");
#endif
 
    initializeEventTracingForTools();
    static SkTaskGroup::Enabler kTaskGroupEnabler(FLAGS_threads);
 
    fBackendType = get_backend_type(FLAGS_backend[0]);
    fWindow = Window::CreateNativeWindow(platformData);
 
    DisplayParams displayParams;
    displayParams.fMSAASampleCount = FLAGS_msaa;
    CommonFlags::SetCtxOptions(&displayParams.fGrContextOptions);
    displayParams.fGrContextOptions.fPersistentCache = &fPersistentCache;
    displayParams.fGrContextOptions.fShaderCacheStrategy =
            GrContextOptions::ShaderCacheStrategy::kSkSL;
    displayParams.fGrContextOptions.fShaderErrorHandler = &gShaderErrorHandler;
    displayParams.fGrContextOptions.fSuppressPrints = true;
    displayParams.fGrContextOptions.fSupportBilerpFromGlyphAtlas = true;
    if (FLAGS_dmsaa) {
        displayParams.fSurfaceProps = SkSurfaceProps(
                displayParams.fSurfaceProps.flags() | SkSurfaceProps::kDynamicMSAA_Flag,
                displayParams.fSurfaceProps.pixelGeometry());
    }
    displayParams.fCreateProtectedNativeBackend = FLAGS_createProtected;
#if defined(SK_GRAPHITE)
    displayParams.fGraphiteContextOptions.fPriv.fPathRendererStrategy =
            get_path_renderer_strategy_type(FLAGS_pathstrategy[0]);
#endif
    fWindow->setRequestedDisplayParams(displayParams);
    fDisplay = fWindow->getRequestedDisplayParams();
    fRefresh = FLAGS_redraw;
 
    fImGuiLayer.setScaleFactor(fWindow->scaleFactor());
    fStatsLayer.setDisplayScale((fZoomUI ? 2.0f : 1.0f) * fWindow->scaleFactor());
 
    // Configure timers
    fStatsLayer.setActive(FLAGS_stats);
    fAnimateTimer = fStatsLayer.addTimer("Animate", SK_ColorMAGENTA, 0xffff66ff);
    fPaintTimer = fStatsLayer.addTimer("Paint", SK_ColorGREEN);
    fFlushTimer = fStatsLayer.addTimer("Flush", SK_ColorRED, 0xffff6666);
 
    // register callbacks
    fCommands.attach(fWindow);
    fWindow->pushLayer(this);
    fWindow->pushLayer(&fStatsLayer);
    fWindow->pushLayer(&fImGuiLayer);
 
    // add key-bindings
    fCommands.addCommand(' ', "GUI", "Toggle Debug GUI", [this]() {
        this->fShowImGuiDebugWindow = !this->fShowImGuiDebugWindow;
        fWindow->inval();
    });
    // Command to jump directly to the slide picker and give it focus
    fCommands.addCommand('/', "GUI", "Jump to slide picker", [this]() {
        this->fShowImGuiDebugWindow = true;
        this->fShowSlidePicker = true;
        fWindow->inval();
    });
    // Alias that to Backspace, to match SampleApp
    fCommands.addCommand(skui::Key::kBack, "Backspace", "GUI", "Jump to slide picker", [this]() {
        this->fShowImGuiDebugWindow = true;
        this->fShowSlidePicker = true;
        fWindow->inval();
    });
    fCommands.addCommand('g', "GUI", "Toggle GUI Demo", [this]() {
        this->fShowImGuiTestWindow = !this->fShowImGuiTestWindow;
        fWindow->inval();
    });
    fCommands.addCommand('z', "GUI", "Toggle zoom window", [this]() {
        this->fShowZoomWindow = !this->fShowZoomWindow;
        fWindow->inval();
    });
    fCommands.addCommand('Z', "GUI", "Toggle zoom window state", [this]() {
        this->fZoomWindowFixed = !this->fZoomWindowFixed;
        fWindow->inval();
    });
    fCommands.addCommand('v', "Swapchain", "Toggle vsync on/off", [this]() {
        DisplayParams params = fWindow->getRequestedDisplayParams();
        params.fDisableVsync = !params.fDisableVsync;
        fWindow->setRequestedDisplayParams(params);
        this->updateTitle();
        fWindow->inval();
    });
    fCommands.addCommand('V', "Swapchain", "Toggle delayed acquire on/off (Metal only)", [this]() {
        DisplayParams params = fWindow->getRequestedDisplayParams();
        params.fDelayDrawableAcquisition = !params.fDelayDrawableAcquisition;
        fWindow->setRequestedDisplayParams(params);
        this->updateTitle();
        fWindow->inval();
    });
    fCommands.addCommand('r', "Redraw", "Toggle redraw", [this]() {
        fRefresh = !fRefresh;
        fWindow->inval();
    });
    fCommands.addCommand('s', "Overlays", "Toggle stats display", [this]() {
        fStatsLayer.setActive(!fStatsLayer.getActive());
        fWindow->inval();
    });
    fCommands.addCommand('0', "Overlays", "Reset stats", [this]() {
        fStatsLayer.resetMeasurements();
        this->updateTitle();
        fWindow->inval();
    });
    fCommands.addCommand('C', "GUI", "Toggle color histogram", [this]() {
        this->fShowHistogramWindow = !this->fShowHistogramWindow;
        fWindow->inval();
    });
    fCommands.addCommand('c', "Modes", "Cycle color mode", [this]() {
        switch (fColorMode) {
            case ColorMode::kLegacy:
                this->setColorMode(ColorMode::kColorManaged8888);
                break;
            case ColorMode::kColorManaged8888:
                this->setColorMode(ColorMode::kColorManagedF16);
                break;
            case ColorMode::kColorManagedF16:
                this->setColorMode(ColorMode::kColorManagedF16Norm);
                break;
            case ColorMode::kColorManagedF16Norm:
                this->setColorMode(ColorMode::kLegacy);
                break;
        }
    });
    fCommands.addCommand('w', "Modes", "Toggle wireframe", [this]() {
        DisplayParams params = fWindow->getRequestedDisplayParams();
        params.fGrContextOptions.fWireframeMode = !params.fGrContextOptions.fWireframeMode;
        fWindow->setRequestedDisplayParams(params);
        fWindow->inval();
    });
    fCommands.addCommand('w', "Modes", "Toggle reduced shaders", [this]() {
      DisplayParams params = fWindow->getRequestedDisplayParams();
      params.fGrContextOptions.fReducedShaderVariations =
              !params.fGrContextOptions.fReducedShaderVariations;
      fWindow->setRequestedDisplayParams(params);
      fWindow->inval();
    });
    fCommands.addCommand(skui::Key::kRight, "Right", "Navigation", "Next slide", [this]() {
        this->setCurrentSlide(fCurrentSlide < fSlides.size() - 1 ? fCurrentSlide + 1 : 0);
    });
    fCommands.addCommand(skui::Key::kLeft, "Left", "Navigation", "Previous slide", [this]() {
        this->setCurrentSlide(fCurrentSlide > 0 ? fCurrentSlide - 1 : fSlides.size() - 1);
    });
    fCommands.addCommand(skui::Key::kUp, "Up", "Transform", "Zoom in", [this]() {
        this->changeZoomLevel(1.f / 32.f);
        fWindow->inval();
    });
    fCommands.addCommand(skui::Key::kDown, "Down", "Transform", "Zoom out", [this]() {
        this->changeZoomLevel(-1.f / 32.f);
        fWindow->inval();
    });
    fCommands.addCommand('d', "Modes", "Change rendering backend", [this]() {
        sk_app::Window::BackendType newBackend = (sk_app::Window::BackendType)(
                (fBackendType + 1) % sk_app::Window::kBackendTypeCount);
        // Switching to and from Vulkan is problematic on Linux so disabled for now
#if defined(SK_BUILD_FOR_UNIX) && defined(SK_VULKAN)
        if (newBackend == sk_app::Window::kVulkan_BackendType) {
            newBackend = (sk_app::Window::BackendType)((newBackend + 1) %
                                                       sk_app::Window::kBackendTypeCount);
        } else if (fBackendType == sk_app::Window::kVulkan_BackendType) {
            newBackend = sk_app::Window::kVulkan_BackendType;
        }
#endif
        this->setBackend(newBackend);
    });
    fCommands.addCommand('K', "IO", "Save slide to SKP", [this]() {
        fSaveToSKP = true;
        fWindow->inval();
    });
    fCommands.addCommand('&', "Overlays", "Show slide dimensios", [this]() {
        fShowSlideDimensions = !fShowSlideDimensions;
        fWindow->inval();
    });
    fCommands.addCommand('G', "Modes", "Geometry", [this]() {
        DisplayParams params = fWindow->getRequestedDisplayParams();
        uint32_t flags = params.fSurfaceProps.flags();
        SkPixelGeometry defaultPixelGeometry = fDisplay.fSurfaceProps.pixelGeometry();
        if (!fDisplayOverrides.fSurfaceProps.fPixelGeometry) {
            fDisplayOverrides.fSurfaceProps.fPixelGeometry = true;
            params.fSurfaceProps = SkSurfaceProps(flags, kUnknown_SkPixelGeometry);
        } else {
            switch (params.fSurfaceProps.pixelGeometry()) {
                case kUnknown_SkPixelGeometry:
                    params.fSurfaceProps = SkSurfaceProps(flags, kRGB_H_SkPixelGeometry);
                    break;
                case kRGB_H_SkPixelGeometry:
                    params.fSurfaceProps = SkSurfaceProps(flags, kBGR_H_SkPixelGeometry);
                    break;
                case kBGR_H_SkPixelGeometry:
                    params.fSurfaceProps = SkSurfaceProps(flags, kRGB_V_SkPixelGeometry);
                    break;
                case kRGB_V_SkPixelGeometry:
                    params.fSurfaceProps = SkSurfaceProps(flags, kBGR_V_SkPixelGeometry);
                    break;
                case kBGR_V_SkPixelGeometry:
                    params.fSurfaceProps = SkSurfaceProps(flags, defaultPixelGeometry);
                    fDisplayOverrides.fSurfaceProps.fPixelGeometry = false;
                    break;
            }
        }
        fWindow->setRequestedDisplayParams(params);
        this->updateTitle();
        fWindow->inval();
    });
    fCommands.addCommand('H', "Font", "Hinting mode", [this]() {
        if (!fFontOverrides.fHinting) {
            fFontOverrides.fHinting = true;
            fFont.setHinting(SkFontHinting::kNone);
        } else {
            switch (fFont.getHinting()) {
                case SkFontHinting::kNone:
                    fFont.setHinting(SkFontHinting::kSlight);
                    break;
                case SkFontHinting::kSlight:
                    fFont.setHinting(SkFontHinting::kNormal);
                    break;
                case SkFontHinting::kNormal:
                    fFont.setHinting(SkFontHinting::kFull);
                    break;
                case SkFontHinting::kFull:
                    fFont.setHinting(SkFontHinting::kNone);
                    fFontOverrides.fHinting = false;
                    break;
            }
        }
        this->updateTitle();
        fWindow->inval();
    });
    fCommands.addCommand('D', "Modes", "DFT", [this]() {
        DisplayParams params = fWindow->getRequestedDisplayParams();
        uint32_t flags = params.fSurfaceProps.flags();
        flags ^= SkSurfaceProps::kUseDeviceIndependentFonts_Flag;
        params.fSurfaceProps = SkSurfaceProps(flags, params.fSurfaceProps.pixelGeometry());
        fWindow->setRequestedDisplayParams(params);
        this->updateTitle();
        fWindow->inval();
    });
    fCommands.addCommand('L', "Font", "Subpixel Antialias Mode", [this]() {
        if (!fFontOverrides.fEdging) {
            fFontOverrides.fEdging = true;
            fFont.setEdging(SkFont::Edging::kAlias);
        } else {
            switch (fFont.getEdging()) {
                case SkFont::Edging::kAlias:
                    fFont.setEdging(SkFont::Edging::kAntiAlias);
                    break;
                case SkFont::Edging::kAntiAlias:
                    fFont.setEdging(SkFont::Edging::kSubpixelAntiAlias);
                    break;
                case SkFont::Edging::kSubpixelAntiAlias:
                    fFont.setEdging(SkFont::Edging::kAlias);
                    fFontOverrides.fEdging = false;
                    break;
            }
        }
        this->updateTitle();
        fWindow->inval();
    });
    fCommands.addCommand('S', "Font", "Subpixel Position Mode", [this]() {
        if (!fFontOverrides.fSubpixel) {
            fFontOverrides.fSubpixel = true;
            fFont.setSubpixel(false);
        } else {
            if (!fFont.isSubpixel()) {
                fFont.setSubpixel(true);
            } else {
                fFontOverrides.fSubpixel = false;
            }
        }
        this->updateTitle();
        fWindow->inval();
    });
    fCommands.addCommand('B', "Font", "Baseline Snapping", [this]() {
        if (!fFontOverrides.fBaselineSnap) {
            fFontOverrides.fBaselineSnap = true;
            fFont.setBaselineSnap(false);
        } else {
            if (!fFont.isBaselineSnap()) {
                fFont.setBaselineSnap(true);
            } else {
                fFontOverrides.fBaselineSnap = false;
            }
        }
        this->updateTitle();
        fWindow->inval();
    });
    fCommands.addCommand('p', "Transform", "Toggle Perspective Mode", [this]() {
        fPerspectiveMode = (kPerspective_Real == fPerspectiveMode) ? kPerspective_Fake
                                                                   : kPerspective_Real;
        this->updateTitle();
        fWindow->inval();
    });
    fCommands.addCommand('P', "Transform", "Toggle Perspective", [this]() {
        fPerspectiveMode = (kPerspective_Off == fPerspectiveMode) ? kPerspective_Real
                                                                  : kPerspective_Off;
        this->updateTitle();
        fWindow->inval();
    });
    fCommands.addCommand('a', "Transform", "Toggle Animation", [this]() {
        fAnimTimer.togglePauseResume();
    });
    fCommands.addCommand('u', "GUI", "Zoom UI", [this]() {
        fZoomUI = !fZoomUI;
        fStatsLayer.setDisplayScale((fZoomUI ? 2.0f : 1.0f) * fWindow->scaleFactor());
        fWindow->inval();
    });
    fCommands.addCommand('$', "ViaSerialize", "Toggle ViaSerialize", [this]() {
        fDrawViaSerialize = !fDrawViaSerialize;
        this->updateTitle();
        fWindow->inval();
    });
 
    // set up slides
    this->initSlides();
    if (FLAGS_list) {
        this->listNames();
    }
 
    fPerspectivePoints[0].set(0, 0);
    fPerspectivePoints[1].set(1, 0);
    fPerspectivePoints[2].set(0, 1);
    fPerspectivePoints[3].set(1, 1);
    fAnimTimer.run();
 
    auto gamutImage = ToolUtils::GetResourceAsImage("images/gamut.png");
    if (gamutImage) {
        fImGuiGamutPaint.setShader(gamutImage->makeShader(SkSamplingOptions(SkFilterMode::kLinear)));
    }
    fImGuiGamutPaint.setColor(SK_ColorWHITE);
 
    fWindow->attach(backend_type_for_window(fBackendType));
    this->setCurrentSlide(this->startupSlide());
}

~Viewer()

Viewer::~Viewer ( )

override

Definition at line 1107 of file Viewer.cpp.

                {
    for(auto& slide : fSlides) {
        slide->gpuTeardown();
    }
 
    fWindow->detach();
    delete fWindow;
}

Member Function Documentation

onBackendCreated()

void Viewer::onBackendCreated ( )

overridevirtual

Reimplemented from sk_app::Window::Layer.

Definition at line 1847 of file Viewer.cpp.

                              {
    this->setupCurrentSlide();
    fWindow->show();
}

onChar()

bool Viewer::onChar ( SkUnichar  c, skui::ModifierKey  modifiers  )

overridevirtual

Reimplemented from sk_app::Window::Layer.

Definition at line 3331 of file Viewer.cpp.

                                                          {
    if (fSlides[fCurrentSlide]->onChar(c)) {
        fWindow->inval();
        return true;
    } else {
        return fCommands.onChar(c, modifiers);
    }
}

onFling()

bool Viewer::onFling ( skui::InputState  state )

overridevirtual

Reimplemented from sk_app::Window::Layer.

Definition at line 1988 of file Viewer.cpp.

                                         {
    if (skui::InputState::kRight == state) {
        this->setCurrentSlide(fCurrentSlide > 0 ? fCurrentSlide - 1 : fSlides.size() - 1);
        return true;
    } else if (skui::InputState::kLeft == state) {
        this->setCurrentSlide(fCurrentSlide < fSlides.size() - 1 ? fCurrentSlide + 1 : 0);
        return true;
    }
    return false;
}

onIdle()

void Viewer::onIdle ( )

overridevirtual

Implements sk_app::Application.

Definition at line 3125 of file Viewer.cpp.

                    {
    TArray<std::function<void()>> actionsToRun;
    actionsToRun.swap(fDeferredActions);
 
    for (const auto& fn : actionsToRun) {
        fn();
    }
 
    fStatsLayer.beginTiming(fAnimateTimer);
    fAnimTimer.updateTime();
    bool animateWantsInval = fSlides[fCurrentSlide]->animate(fAnimTimer.nanos());
    fStatsLayer.endTiming(fAnimateTimer);
 
    ImGuiIO& io = ImGui::GetIO();
    // ImGui always has at least one "active" window, which is the default "Debug" window. It may
    // not be visible, though. So we need to redraw if there is at least one visible window, or
    // more than one active window. Newly created windows are active but not visible for one frame
    // while they determine their layout and sizing.
    if (animateWantsInval || fStatsLayer.getActive() || fRefresh ||
        io.MetricsActiveWindows > 1 || io.MetricsRenderWindows > 0) {
        fWindow->inval();
    }
}

onKey()

bool Viewer::onKey ( skui::Key  key, skui::InputState  state, skui::ModifierKey  modifiers  )

overridevirtual

Reimplemented from sk_app::Window::Layer.

Definition at line 3327 of file Viewer.cpp.

                                                                               {
    return fCommands.onKey(key, state, modifiers);
}

onMouse()

bool Viewer::onMouse ( int  x, int  y, skui::InputState  state, skui::ModifierKey  modifiers  )

overridevirtual

Reimplemented from sk_app::Window::Layer.

Definition at line 1939 of file Viewer.cpp.

                                                                                  {
    if (GestureDevice::kTouch == fGestureDevice) {
        return false;
    }
 
    const auto slidePt = this->mapEvent(x, y);
    if (fSlides[fCurrentSlide]->onMouse(slidePt.x(), slidePt.y(), state, modifiers)) {
        fWindow->inval();
        return true;
    }
 
    switch (state) {
        case skui::InputState::kUp: {
            fGesture.touchEnd(nullptr);
            break;
        }
        case skui::InputState::kDown: {
            fGesture.touchBegin(nullptr, x, y);
            break;
        }
        case skui::InputState::kMove: {
            fGesture.touchMoved(nullptr, x, y);
            break;
        }
        default: {
            SkASSERT(false); // shouldn't see kRight or kLeft here
            break;
        }
    }
    fGestureDevice = fGesture.isBeingTouched() ? GestureDevice::kMouse : GestureDevice::kNone;
 
    if (state != skui::InputState::kMove || fGesture.isBeingTouched()) {
        fWindow->inval();
    }
    return true;
}

onMouseWheel()

bool Viewer::onMouseWheel ( float  delta, int  x, int  y, skui::ModifierKey    )

overridevirtual

Reimplemented from sk_app::Window::Layer.

Definition at line 1976 of file Viewer.cpp.

                                                                    {
    // Rather than updating the fixed zoom level, treat a mouse wheel event as a gesture, which
    // applies a pre- and post-translation to the transform, resulting in a zoom effect centered at
    // the mouse cursor position.
    SkScalar scale = exp(delta * 0.001);
    fGesture.startZoom();
    fGesture.updateZoom(scale, x, y, x, y);
    fGesture.endZoom();
    fWindow->inval();
    return true;
}

onPaint()

void Viewer::onPaint ( SkSurface *  surface )

overridevirtual

Reimplemented from sk_app::Window::Layer.

Definition at line 1852 of file Viewer.cpp.

                                       {
    this->drawSlide(surface);
 
    fCommands.drawHelp(surface->getCanvas());
 
    this->drawImGui();
 
    fLastImage.reset();
 
    if (auto direct = fWindow->directContext()) {
        // Clean out cache items that haven't been used in more than 10 seconds.
        direct->performDeferredCleanup(std::chrono::seconds(10));
    }
}

onPinch()

bool Viewer::onPinch ( skui::InputState  state, float  scale, float  x, float  y  )

overridevirtual

Reimplemented from sk_app::Window::Layer.

Definition at line 1999 of file Viewer.cpp.

                                                                        {
    switch (state) {
        case skui::InputState::kDown:
            fGesture.startZoom();
            return true;
        case skui::InputState::kMove:
            fGesture.updateZoom(scale, x, y, x, y);
            return true;
        case skui::InputState::kUp:
            fGesture.endZoom();
            return true;
        default:
            SkASSERT(false);
            break;
    }
 
    return false;
}

onResize()

void Viewer::onResize ( int  width, int  height  )

overridevirtual

Reimplemented from sk_app::Window::Layer.

Definition at line 1867 of file Viewer.cpp.

                                           {
    if (fCurrentSlide >= 0) {
        SkScalar scaleFactor = 1.0;
        if (fApplyBackingScale) {
            scaleFactor = fWindow->scaleFactor();
        }
        fSlides[fCurrentSlide]->resize(width / scaleFactor, height / scaleFactor);
    }
}

onTouch()

bool Viewer::onTouch ( intptr_t  owner, skui::InputState  state, float  x, float  y  )

overridevirtual

Reimplemented from sk_app::Window::Layer.

Definition at line 1886 of file Viewer.cpp.

                                                                           {
    if (GestureDevice::kMouse == fGestureDevice) {
        return false;
    }
 
    const auto slidePt = this->mapEvent(x, y);
    if (fSlides[fCurrentSlide]->onMouse(slidePt.x(), slidePt.y(), state, skui::ModifierKey::kNone)) {
        fWindow->inval();
        return true;
    }
 
    void* castedOwner = reinterpret_cast<void*>(owner);
    switch (state) {
        case skui::InputState::kUp: {
            fGesture.touchEnd(castedOwner);
#if defined(SK_BUILD_FOR_IOS)
            // TODO: move IOS swipe detection higher up into the platform code
            SkPoint dir;
            if (fGesture.isFling(&dir)) {
                // swiping left or right
                if (SkTAbs(dir.fX) > SkTAbs(dir.fY)) {
                    if (dir.fX < 0) {
                        this->setCurrentSlide(fCurrentSlide < fSlides.size() - 1 ?
                                              fCurrentSlide + 1 : 0);
                    } else {
                        this->setCurrentSlide(fCurrentSlide > 0 ?
                                              fCurrentSlide - 1 : fSlides.size() - 1);
                    }
                }
                fGesture.reset();
            }
#endif
            break;
        }
        case skui::InputState::kDown: {
            fGesture.touchBegin(castedOwner, x, y);
            break;
        }
        case skui::InputState::kMove: {
            fGesture.touchMoved(castedOwner, x, y);
            break;
        }
        default: {
            // kLeft and kRight are only for swipes
            SkASSERT(false);
            break;
        }
    }
    fGestureDevice = fGesture.isBeingTouched() ? GestureDevice::kTouch : GestureDevice::kNone;
    fWindow->inval();
    return true;
}

onUIStateChanged()

void Viewer::onUIStateChanged ( const SkString &  stateName, const SkString &  stateValue  )

overridevirtual

Reimplemented from sk_app::Window::Layer.

Definition at line 3260 of file Viewer.cpp.

                                                                                   {
    // For those who will add more features to handle the state change in this function:
    // After the change, please call updateUIState no notify the frontend (e.g., Android app).
    // For example, after slide change, updateUIState is called inside setupCurrentSlide;
    // after backend change, updateUIState is called in this function.
    if (stateName.equals(kSlideStateName)) {
        for (int i = 0; i < fSlides.size(); ++i) {
            if (fSlides[i]->getName().equals(stateValue)) {
                this->setCurrentSlide(i);
                return;
            }
        }
 
        SkDebugf("Slide not found: %s", stateValue.c_str());
    } else if (stateName.equals(kBackendStateName)) {
        for (int i = 0; i < sk_app::Window::kBackendTypeCount; i++) {
            auto backendType = static_cast<sk_app::Window::BackendType>(i);
            if (stateValue.equals(get_backend_string(backendType))) {
                if (fBackendType != i) {
                    fBackendType = backendType;
                    for(auto& slide : fSlides) {
                        slide->gpuTeardown();
                    }
                    fWindow->detach();
                    fWindow->attach(backend_type_for_window(fBackendType));
                }
                break;
            }
        }
    } else if (stateName.equals(kMSAAStateName)) {
        DisplayParams params = fWindow->getRequestedDisplayParams();
        int sampleCount = atoi(stateValue.c_str());
        if (sampleCount != params.fMSAASampleCount) {
            params.fMSAASampleCount = sampleCount;
            fWindow->setRequestedDisplayParams(params);
            fWindow->inval();
            this->updateTitle();
            this->updateUIState();
        }
    } else if (stateName.equals(kPathRendererStateName)) {
        DisplayParams params = fWindow->getRequestedDisplayParams();
        for (const auto& pair : gGaneshPathRendererNames) {
            if (pair.second == stateValue.c_str()) {
                if (params.fGrContextOptions.fGpuPathRenderers != pair.first) {
                    params.fGrContextOptions.fGpuPathRenderers = pair.first;
                    fWindow->setRequestedDisplayParams(params);
                    fWindow->inval();
                    this->updateTitle();
                    this->updateUIState();
                }
                break;
            }
        }
    } else if (stateName.equals(kSoftkeyStateName)) {
        if (!stateValue.equals(kSoftkeyHint)) {
            fCommands.onSoftkey(stateValue);
            this->updateUIState(); // This is still needed to reset the value to kSoftkeyHint
        }
    } else if (stateName.equals(kRefreshStateName)) {
        // This state is actually NOT in the UI state.
        // We use this to allow Android to quickly set bool fRefresh.
        fRefresh = stateValue.equals(kON);
    } else {
        SkDebugf("Unknown stateName: %s", stateName.c_str());
    }
}

ShaderErrorHandler()

GrContextOptions::ShaderErrorHandler * Viewer::ShaderErrorHandler ( )

static

Definition at line 167 of file Viewer.cpp.

{ return &gShaderErrorHandler; }

---

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

• third_party/skia/tools/viewer/Viewer.h
• third_party/skia/tools/viewer/Viewer.cpp