tools/viewer/NIMASlide.cpp - platform/external/skia - Gitiles

 /*
 * Copyright 2018 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

 #include "NIMASlide.h"

 #include "SkAnimTimer.h"
 #include "SkOSPath.h"
 #include "Resources.h"
 #include "imgui.h"

 #include <algorithm>
 #include <cmath>

 using namespace sk_app;
 using namespace nima;

 // ImGui expects an array of const char* when displaying a ListBox. This function is for an
 // overload of ImGui::ListBox that takes a getter so that ListBox works with
 // std::vector<std::string>.
 static bool vector_getter(void* v, int index, const char** out) {
     auto vector = reinterpret_cast<std::vector<std::string>*>(v);
     *out = vector->at(index).c_str();
     return true;
 }

 // A wrapper class that handles rendering of ActorImages (renderable components NIMA Actors).
 class NIMAActorImage {
 public:
     NIMAActorImage(ActorImage* actorImage, SkImage* texture, SkPaint* paint)
             : fActorImage(actorImage)
             , fTexture(texture)
             , fPaint(paint)
             , fSkinned(false)
             , fPositions()
             , fTexs()
             , fBoneIdx()
             , fBoneWgt()
             , fIndices()
             , fBones()
             , fVertices(nullptr)
             , fRenderFlags(0) {
         // Update the vertices and bones.
         this->updateVertices(true);
         this->updateBones();
     }

     void render(SkCanvas* canvas, uint32_t renderFlags) {
         bool dirty = renderFlags != fRenderFlags;
         fRenderFlags = renderFlags;

         bool useImmediate = renderFlags & kImmediate_RenderFlag;
         bool useCache = renderFlags & kCache_RenderFlag;
         bool drawBounds = renderFlags & kBounds_RenderFlag;

         // Don't use the cache if drawing in immediate mode.
         useCache &= !useImmediate;

         if (fActorImage->doesAnimationVertexDeform() || dirty) {
             // These are vertices that transform beyond just bone transforms, so they must be
             // updated every frame.
             // If the render flags are dirty, reset the vertices object.
             this->updateVertices(!useCache);
         }

         // Update the bones.
         this->updateBones();

         // Deform the bones in immediate mode.
         sk_sp<SkVertices> vertices = fVertices;
         if (useImmediate) {
             vertices = fVertices->applyBones(fBones.data(), fBones.size());
         }

         // Draw the vertices object.
         this->drawVerticesObject(vertices.get(), canvas, !useImmediate);

         // Draw the bounds.
         if (drawBounds && fActorImage->renderOpacity() > 0.0f) {
             // Get the bounds.
             SkRect bounds = vertices->bounds();

             // Approximate bounds if not using immediate transforms.
             if (!useImmediate) {
                 const SkRect originalBounds = fBones[0].mapRect(vertices->bounds());
                 bounds = originalBounds;
                 for (size_t i = 1; i < fBones.size(); i++) {
                     const SkVertices::Bone& matrix = fBones[i];
                     bounds.join(matrix.mapRect(originalBounds));
                 }
             }

             // Draw the bounds.
             SkPaint paint;
             paint.setStyle(SkPaint::kStroke_Style);
             paint.setColor(0xFFFF0000);
             canvas->drawRect(bounds, paint);
         }
     }

     int drawOrder() const { return fActorImage->drawOrder(); }

 private:
     void updateVertices(bool isVolatile) {
         // Update whether the image is skinned.
         fSkinned = fActorImage->connectedBoneCount() > 0;

         // Retrieve data from the image.
         uint32_t  vertexCount  = fActorImage->vertexCount();
         uint32_t  vertexStride = fActorImage->vertexStride();
         float*    vertexData   = fActorImage->vertices();
         uint32_t  indexCount   = fActorImage->triangleCount() * 3;
         uint16_t* indexData    = fActorImage->triangles();

         // Don't render if not visible.
         if (!vertexCount || fActorImage->textureIndex() < 0) {
             fPositions.clear();
             fTexs.clear();
             fBoneIdx.clear();
             fBoneWgt.clear();
             fIndices.clear();
             return;
         }

         // Split the vertex data.
         fPositions.resize(vertexCount);
         fTexs.resize(vertexCount);
         fIndices.resize(indexCount);
         if (fSkinned) {
             fBoneIdx.resize(vertexCount * 4);
             fBoneWgt.resize(vertexCount * 4);
         }
         for (uint32_t i = 0; i < vertexCount; i ++) {
             uint32_t j = i * vertexStride;

             // Get the attributes.
             float* attrPosition = vertexData + j;
             float* attrTex      = vertexData + j + 2;
             float* attrBoneIdx  = vertexData + j + 4;
             float* attrBoneWgt  = vertexData + j + 8;

             // Get deformed positions if necessary.
             if (fActorImage->doesAnimationVertexDeform()) {
                 attrPosition = fActorImage->animationDeformedVertices() + i * 2;
             }

             // Set the data.
             fPositions[i].set(attrPosition[0], attrPosition[1]);
             fTexs[i].set(attrTex[0] * fTexture->width(), attrTex[1] * fTexture->height());
             if (fSkinned) {
                 for (uint32_t k = 0; k < 4; k ++) {
                     fBoneIdx[i][k] = static_cast<uint32_t>(attrBoneIdx[k]);
                     fBoneWgt[i][k] = attrBoneWgt[k];
                 }
             }
         }
         memcpy(fIndices.data(), indexData, indexCount * sizeof(uint16_t));

         // Update the vertices object.
         fVertices = SkVertices::MakeCopy(SkVertices::kTriangles_VertexMode,
                                          vertexCount,
                                          fPositions.data(),
                                          fTexs.data(),
                                          nullptr,
                                          fBoneIdx.data(),
                                          fBoneWgt.data(),
                                          fIndices.size(),
                                          fIndices.data(),
                                          isVolatile);
     }

     void updateBones() {
         // NIMA matrices are a collection of 6 floats.
         constexpr int kNIMAMatrixSize = 6;

         // Set up the matrices for the first time.
         if (fBones.size() == 0) {
             int numMatrices = 1;
             if (fSkinned) {
                 numMatrices = fActorImage->boneInfluenceMatricesLength() / kNIMAMatrixSize;
             }

             // Initialize all matrices to the identity matrix.
             fBones.assign(numMatrices, {{ 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f }});
         }

         if (fSkinned) {
             // Update the matrices.
             float* matrixData = fActorImage->boneInfluenceMatrices();
             memcpy(fBones.data(), matrixData, fBones.size() * kNIMAMatrixSize * sizeof(float));
         }

         // Set the zero matrix to be the world transform.
         memcpy(fBones.data(),
                fActorImage->worldTransform().values(),
                kNIMAMatrixSize * sizeof(float));
     }

     void drawVerticesObject(SkVertices* vertices, SkCanvas* canvas, bool useBones) const {
         // Determine the blend mode.
         SkBlendMode blendMode;
         switch (fActorImage->blendMode()) {
             case BlendMode::Off: {
                 blendMode = SkBlendMode::kSrc;
                 break;
             }
             case BlendMode::Normal: {
                 blendMode = SkBlendMode::kSrcOver;
                 break;
             }
             case BlendMode::Additive: {
                 blendMode = SkBlendMode::kPlus;
                 break;
             }
             case BlendMode::Multiply: {
                 blendMode = SkBlendMode::kMultiply;
                 break;
             }
             case BlendMode::Screen: {
                 blendMode = SkBlendMode::kScreen;
                 break;
             }
         }

         // Set the opacity.
         fPaint->setAlpha(static_cast<U8CPU>(fActorImage->renderOpacity() * 255));

         // Draw the vertices.
         if (useBones) {
             canvas->drawVertices(vertices, fBones.data(), fBones.size(), blendMode, *fPaint);
         } else {
             canvas->drawVertices(vertices, blendMode, *fPaint);
         }

         // Reset the opacity.
         fPaint->setAlpha(255);
     }

 private:
     ActorImage* fActorImage;
     SkImage*    fTexture;
     SkPaint*    fPaint;

     bool                                 fSkinned;
     std::vector<SkPoint>                 fPositions;
     std::vector<SkPoint>                 fTexs;
     std::vector<SkVertices::BoneIndices> fBoneIdx;
     std::vector<SkVertices::BoneWeights> fBoneWgt;
     std::vector<uint16_t>                fIndices;

     std::vector<SkVertices::Bone> fBones;
     sk_sp<SkVertices>             fVertices;

     uint32_t fRenderFlags;
 };

 //////////////////////////////////////////////////////////////////////////////////////////////////

 // Represents an Actor, or an animated character, in NIMA.
 class NIMAActor : public Actor {
 public:
     NIMAActor(const std::string& basePath)
         : fTexture(nullptr)
         , fActorImages()
         , fPaint()
         , fAnimations() {
         // Load the NIMA data.
         std::string nimaPath((basePath + ".nima").c_str());
         INHERITED::load(nimaPath);

         // Load the image asset.
         sk_sp<SkData> imageData = SkData::MakeFromFileName((basePath + ".png").c_str());
         fTexture = SkImage::MakeFromEncoded(imageData);

         // Create the paint.
         fPaint.setShader(fTexture->makeShader(nullptr));
         fPaint.setFilterQuality(SkFilterQuality::kLow_SkFilterQuality);

         // Load the image nodes.
         fActorImages.reserve(m_ImageNodeCount);
         for (uint32_t i = 0; i < m_ImageNodeCount; i ++) {
             fActorImages.emplace_back(m_ImageNodes[i], fTexture.get(), &fPaint);
         }

         // Sort the image nodes.
         std::sort(fActorImages.begin(), fActorImages.end(), [](auto a, auto b) {
             return a.drawOrder() < b.drawOrder();
         });

         // Get the list of animations.
         fAnimations.reserve(m_AnimationsCount);
         for (uint32_t i = 0; i < m_AnimationsCount; i ++) {
             fAnimations.push_back(m_Animations[i].name());
         }
     }

     void render(SkCanvas* canvas, uint32_t renderFlags) {
         // Render the image nodes.
         for (auto& image : fActorImages) {
             image.render(canvas, renderFlags);
         }
     }

     const std::vector<std::string>& getAnimations() const {
         return fAnimations;
     }

 private:
     sk_sp<SkImage>              fTexture;
     std::vector<NIMAActorImage> fActorImages;
     SkPaint                     fPaint;
     std::vector<std::string>    fAnimations;

     typedef Actor INHERITED;
 };

 //////////////////////////////////////////////////////////////////////////////////////////////////

 NIMASlide::NIMASlide(const SkString& name, const SkString& path)
         : fBasePath()
         , fActor(nullptr)
         , fPlaying(true)
         , fTime(0.0f)
         , fRenderFlags(0)
         , fAnimation(nullptr)
         , fAnimationIndex(0) {
     fName = name;

     // Get the path components.
     SkString baseName = SkOSPath::Basename(path.c_str());
     baseName.resize(baseName.size() - 5);
     SkString dirName = SkOSPath::Dirname(path.c_str());
     SkString basePath = SkOSPath::Join(dirName.c_str(), baseName.c_str());

     // Save the base path.
     fBasePath = std::string(basePath.c_str());
 }

 NIMASlide::~NIMASlide() {}

 SkISize NIMASlide::getDimensions() const {
     return SkISize::MakeEmpty(); // TODO
 }

 void NIMASlide::draw(SkCanvas* canvas) {
     canvas->save();

     for (int i = 0; i < 10; i ++) {
         for (int j = 0; j < 10; j ++) {
             canvas->save();

             canvas->translate(1250 - 250 * i, 1250 - 250 * j);
             canvas->scale(0.5, -0.5);

             // Render the actor.
             fActor->render(canvas, fRenderFlags);

             canvas->restore();
         }
     }

     canvas->restore();

     // Render the GUI.
     this->renderGUI();
 }

 void NIMASlide::load(SkScalar winWidth, SkScalar winHeight) {
     this->resetActor();
 }

 void NIMASlide::unload() {
     // Discard resources.
     fAnimation = nullptr;
     fActor.reset(nullptr);
 }

 bool NIMASlide::animate(const SkAnimTimer& timer) {
     // Apply the animation.
     if (fAnimation) {
         if (fPlaying) {
             fTime = std::fmod(timer.secs(), fAnimation->max());
         }
         fAnimation->time(fTime);
         fAnimation->apply(1.0f);
     }
     return true;
 }

 bool NIMASlide::onChar(SkUnichar c) {
     return false;
 }

 bool NIMASlide::onMouse(SkScalar x, SkScalar y, Window::InputState state, uint32_t modifiers) {
     return false;
 }

 void NIMASlide::resetActor() {
     // Create the actor.
     fActor = std::make_unique<NIMAActor>(fBasePath);

     // Get the animation.
     fAnimation = fActor->animationInstance(fActor->getAnimations()[fAnimationIndex]);
 }

 void NIMASlide::renderGUI() {
     ImGui::SetNextWindowSize(ImVec2(300, 0));
     ImGui::Begin("NIMA");

     // List of animations.
     auto animations = const_cast<std::vector<std::string>&>(fActor->getAnimations());
     ImGui::PushItemWidth(-1);
     if (ImGui::ListBox("Animations",
                        &fAnimationIndex,
                        vector_getter,
                        reinterpret_cast<void*>(&animations),
                        animations.size(),
                        5)) {
         resetActor();
     }

     // Playback control.
     ImGui::Spacing();
     if (ImGui::Button("Play")) {
         fPlaying = true;
     }
     ImGui::SameLine();
     if (ImGui::Button("Pause")) {
         fPlaying = false;
     }

     // Time slider.
     ImGui::PushItemWidth(-1);
     ImGui::SliderFloat("Time", &fTime, 0.0f, fAnimation->max(), "Time: %.3f");

     // Backend control.
     int useImmediate = SkToBool(fRenderFlags & kImmediate_RenderFlag);
     ImGui::Spacing();
     ImGui::RadioButton("Skia Backend", &useImmediate, 0);
     ImGui::RadioButton("Immediate Backend", &useImmediate, 1);
     if (useImmediate) {
         fRenderFlags |= kImmediate_RenderFlag;
     } else {
         fRenderFlags &= ~kImmediate_RenderFlag;
     }

     // Cache control.
     bool useCache = SkToBool(fRenderFlags & kCache_RenderFlag);
     ImGui::Spacing();
     ImGui::Checkbox("Cache Vertices", &useCache);
     if (useCache) {
         fRenderFlags |= kCache_RenderFlag;
     } else {
         fRenderFlags &= ~kCache_RenderFlag;
     }

     // Bounding box toggle.
     bool drawBounds = SkToBool(fRenderFlags & kBounds_RenderFlag);
     ImGui::Spacing();
     ImGui::Checkbox("Draw Bounds", &drawBounds);
     if (drawBounds) {
         fRenderFlags |= kBounds_RenderFlag;
     } else {
         fRenderFlags &= ~kBounds_RenderFlag;
     }

     ImGui::End();
 }
	/*
	* Copyright 2018 Google Inc.
	*
	* Use of this source code is governed by a BSD-style license that can be
	* found in the LICENSE file.
	*/

	#include "NIMASlide.h"

	#include "SkAnimTimer.h"
	#include "SkOSPath.h"
	#include "Resources.h"
	#include "imgui.h"

	#include <algorithm>
	#include <cmath>

	using namespace sk_app;
	using namespace nima;

	// ImGui expects an array of const char* when displaying a ListBox. This function is for an
	// overload of ImGui::ListBox that takes a getter so that ListBox works with
	// std::vector<std::string>.
	static bool vector_getter(void* v, int index, const char** out) {
	auto vector = reinterpret_cast<std::vector<std::string>*>(v);
	*out = vector->at(index).c_str();
	return true;
	}

	// A wrapper class that handles rendering of ActorImages (renderable components NIMA Actors).
	class NIMAActorImage {
	public:
	NIMAActorImage(ActorImage* actorImage, SkImage* texture, SkPaint* paint)
	: fActorImage(actorImage)
	, fTexture(texture)
	, fPaint(paint)
	, fSkinned(false)
	, fPositions()
	, fTexs()
	, fBoneIdx()
	, fBoneWgt()
	, fIndices()
	, fBones()
	, fVertices(nullptr)
	, fRenderFlags(0) {
	// Update the vertices and bones.
	this->updateVertices(true);
	this->updateBones();
	}

	void render(SkCanvas* canvas, uint32_t renderFlags) {
	bool dirty = renderFlags != fRenderFlags;
	fRenderFlags = renderFlags;

	bool useImmediate = renderFlags & kImmediate_RenderFlag;
	bool useCache = renderFlags & kCache_RenderFlag;
	bool drawBounds = renderFlags & kBounds_RenderFlag;

	// Don't use the cache if drawing in immediate mode.
	useCache &= !useImmediate;

	if (fActorImage->doesAnimationVertexDeform() \|\| dirty) {
	// These are vertices that transform beyond just bone transforms, so they must be
	// updated every frame.
	// If the render flags are dirty, reset the vertices object.
	this->updateVertices(!useCache);
	}

	// Update the bones.
	this->updateBones();

	// Deform the bones in immediate mode.
	sk_sp<SkVertices> vertices = fVertices;
	if (useImmediate) {
	vertices = fVertices->applyBones(fBones.data(), fBones.size());
	}

	// Draw the vertices object.
	this->drawVerticesObject(vertices.get(), canvas, !useImmediate);

	// Draw the bounds.
	if (drawBounds && fActorImage->renderOpacity() > 0.0f) {
	// Get the bounds.
	SkRect bounds = vertices->bounds();

	// Approximate bounds if not using immediate transforms.
	if (!useImmediate) {
	const SkRect originalBounds = fBones[0].mapRect(vertices->bounds());
	bounds = originalBounds;
	for (size_t i = 1; i < fBones.size(); i++) {
	const SkVertices::Bone& matrix = fBones[i];
	bounds.join(matrix.mapRect(originalBounds));
	}
	}

	// Draw the bounds.
	SkPaint paint;
	paint.setStyle(SkPaint::kStroke_Style);
	paint.setColor(0xFFFF0000);
	canvas->drawRect(bounds, paint);
	}
	}

	int drawOrder() const { return fActorImage->drawOrder(); }

	private:
	void updateVertices(bool isVolatile) {
	// Update whether the image is skinned.
	fSkinned = fActorImage->connectedBoneCount() > 0;

	// Retrieve data from the image.
	uint32_t vertexCount = fActorImage->vertexCount();
	uint32_t vertexStride = fActorImage->vertexStride();
	float* vertexData = fActorImage->vertices();
	uint32_t indexCount = fActorImage->triangleCount() * 3;
	uint16_t* indexData = fActorImage->triangles();

	// Don't render if not visible.
	if (!vertexCount \|\| fActorImage->textureIndex() < 0) {
	fPositions.clear();
	fTexs.clear();
	fBoneIdx.clear();
	fBoneWgt.clear();
	fIndices.clear();
	return;
	}

	// Split the vertex data.
	fPositions.resize(vertexCount);
	fTexs.resize(vertexCount);
	fIndices.resize(indexCount);
	if (fSkinned) {
	fBoneIdx.resize(vertexCount * 4);
	fBoneWgt.resize(vertexCount * 4);
	}
	for (uint32_t i = 0; i < vertexCount; i ++) {
	uint32_t j = i * vertexStride;

	// Get the attributes.
	float* attrPosition = vertexData + j;
	float* attrTex = vertexData + j + 2;
	float* attrBoneIdx = vertexData + j + 4;
	float* attrBoneWgt = vertexData + j + 8;

	// Get deformed positions if necessary.
	if (fActorImage->doesAnimationVertexDeform()) {
	attrPosition = fActorImage->animationDeformedVertices() + i * 2;
	}

	// Set the data.
	fPositions[i].set(attrPosition[0], attrPosition[1]);
	fTexs[i].set(attrTex[0] * fTexture->width(), attrTex[1] * fTexture->height());
	if (fSkinned) {
	for (uint32_t k = 0; k < 4; k ++) {
	fBoneIdx[i][k] = static_cast<uint32_t>(attrBoneIdx[k]);
	fBoneWgt[i][k] = attrBoneWgt[k];
	}
	}
	}
	memcpy(fIndices.data(), indexData, indexCount * sizeof(uint16_t));

	// Update the vertices object.
	fVertices = SkVertices::MakeCopy(SkVertices::kTriangles_VertexMode,
	vertexCount,
	fPositions.data(),
	fTexs.data(),
	nullptr,
	fBoneIdx.data(),
	fBoneWgt.data(),
	fIndices.size(),
	fIndices.data(),
	isVolatile);
	}

	void updateBones() {
	// NIMA matrices are a collection of 6 floats.
	constexpr int kNIMAMatrixSize = 6;

	// Set up the matrices for the first time.
	if (fBones.size() == 0) {
	int numMatrices = 1;
	if (fSkinned) {
	numMatrices = fActorImage->boneInfluenceMatricesLength() / kNIMAMatrixSize;
	}

	// Initialize all matrices to the identity matrix.
	fBones.assign(numMatrices, {{ 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f }});
	}

	if (fSkinned) {
	// Update the matrices.
	float* matrixData = fActorImage->boneInfluenceMatrices();
	memcpy(fBones.data(), matrixData, fBones.size() * kNIMAMatrixSize * sizeof(float));
	}

	// Set the zero matrix to be the world transform.
	memcpy(fBones.data(),
	fActorImage->worldTransform().values(),
	kNIMAMatrixSize * sizeof(float));
	}

	void drawVerticesObject(SkVertices* vertices, SkCanvas* canvas, bool useBones) const {
	// Determine the blend mode.
	SkBlendMode blendMode;
	switch (fActorImage->blendMode()) {
	case BlendMode::Off: {
	blendMode = SkBlendMode::kSrc;
	break;
	}
	case BlendMode::Normal: {
	blendMode = SkBlendMode::kSrcOver;
	break;
	}
	case BlendMode::Additive: {
	blendMode = SkBlendMode::kPlus;
	break;
	}
	case BlendMode::Multiply: {
	blendMode = SkBlendMode::kMultiply;
	break;
	}
	case BlendMode::Screen: {
	blendMode = SkBlendMode::kScreen;
	break;
	}
	}

	// Set the opacity.
	fPaint->setAlpha(static_cast<U8CPU>(fActorImage->renderOpacity() * 255));

	// Draw the vertices.
	if (useBones) {
	canvas->drawVertices(vertices, fBones.data(), fBones.size(), blendMode, *fPaint);
	} else {
	canvas->drawVertices(vertices, blendMode, *fPaint);
	}

	// Reset the opacity.
	fPaint->setAlpha(255);
	}

	private:
	ActorImage* fActorImage;
	SkImage* fTexture;
	SkPaint* fPaint;

	bool fSkinned;
	std::vector<SkPoint> fPositions;
	std::vector<SkPoint> fTexs;
	std::vector<SkVertices::BoneIndices> fBoneIdx;
	std::vector<SkVertices::BoneWeights> fBoneWgt;
	std::vector<uint16_t> fIndices;

	std::vector<SkVertices::Bone> fBones;
	sk_sp<SkVertices> fVertices;

	uint32_t fRenderFlags;
	};

	//////////////////////////////////////////////////////////////////////////////////////////////////

	// Represents an Actor, or an animated character, in NIMA.
	class NIMAActor : public Actor {
	public:
	NIMAActor(const std::string& basePath)
	: fTexture(nullptr)
	, fActorImages()
	, fPaint()
	, fAnimations() {
	// Load the NIMA data.
	std::string nimaPath((basePath + ".nima").c_str());
	INHERITED::load(nimaPath);

	// Load the image asset.
	sk_sp<SkData> imageData = SkData::MakeFromFileName((basePath + ".png").c_str());
	fTexture = SkImage::MakeFromEncoded(imageData);

	// Create the paint.
	fPaint.setShader(fTexture->makeShader(nullptr));
	fPaint.setFilterQuality(SkFilterQuality::kLow_SkFilterQuality);

	// Load the image nodes.
	fActorImages.reserve(m_ImageNodeCount);
	for (uint32_t i = 0; i < m_ImageNodeCount; i ++) {
	fActorImages.emplace_back(m_ImageNodes[i], fTexture.get(), &fPaint);
	}

	// Sort the image nodes.
	std::sort(fActorImages.begin(), fActorImages.end(), [](auto a, auto b) {
	return a.drawOrder() < b.drawOrder();
	});

	// Get the list of animations.
	fAnimations.reserve(m_AnimationsCount);
	for (uint32_t i = 0; i < m_AnimationsCount; i ++) {
	fAnimations.push_back(m_Animations[i].name());
	}
	}

	void render(SkCanvas* canvas, uint32_t renderFlags) {
	// Render the image nodes.
	for (auto& image : fActorImages) {
	image.render(canvas, renderFlags);
	}
	}

	const std::vector<std::string>& getAnimations() const {
	return fAnimations;
	}

	private:
	sk_sp<SkImage> fTexture;
	std::vector<NIMAActorImage> fActorImages;
	SkPaint fPaint;
	std::vector<std::string> fAnimations;

	typedef Actor INHERITED;
	};

	//////////////////////////////////////////////////////////////////////////////////////////////////

	NIMASlide::NIMASlide(const SkString& name, const SkString& path)
	: fBasePath()
	, fActor(nullptr)
	, fPlaying(true)
	, fTime(0.0f)
	, fRenderFlags(0)
	, fAnimation(nullptr)
	, fAnimationIndex(0) {
	fName = name;

	// Get the path components.
	SkString baseName = SkOSPath::Basename(path.c_str());
	baseName.resize(baseName.size() - 5);
	SkString dirName = SkOSPath::Dirname(path.c_str());
	SkString basePath = SkOSPath::Join(dirName.c_str(), baseName.c_str());

	// Save the base path.
	fBasePath = std::string(basePath.c_str());
	}

	NIMASlide::~NIMASlide() {}

	SkISize NIMASlide::getDimensions() const {
	return SkISize::MakeEmpty(); // TODO
	}

	void NIMASlide::draw(SkCanvas* canvas) {
	canvas->save();

	for (int i = 0; i < 10; i ++) {
	for (int j = 0; j < 10; j ++) {
	canvas->save();

	canvas->translate(1250 - 250 * i, 1250 - 250 * j);
	canvas->scale(0.5, -0.5);

	// Render the actor.
	fActor->render(canvas, fRenderFlags);

	canvas->restore();
	}
	}

	canvas->restore();

	// Render the GUI.
	this->renderGUI();
	}

	void NIMASlide::load(SkScalar winWidth, SkScalar winHeight) {
	this->resetActor();
	}

	void NIMASlide::unload() {
	// Discard resources.
	fAnimation = nullptr;
	fActor.reset(nullptr);
	}

	bool NIMASlide::animate(const SkAnimTimer& timer) {
	// Apply the animation.
	if (fAnimation) {
	if (fPlaying) {
	fTime = std::fmod(timer.secs(), fAnimation->max());
	}
	fAnimation->time(fTime);
	fAnimation->apply(1.0f);
	}
	return true;
	}

	bool NIMASlide::onChar(SkUnichar c) {
	return false;
	}

	bool NIMASlide::onMouse(SkScalar x, SkScalar y, Window::InputState state, uint32_t modifiers) {
	return false;
	}

	void NIMASlide::resetActor() {
	// Create the actor.
	fActor = std::make_unique<NIMAActor>(fBasePath);

	// Get the animation.
	fAnimation = fActor->animationInstance(fActor->getAnimations()[fAnimationIndex]);
	}

	void NIMASlide::renderGUI() {
	ImGui::SetNextWindowSize(ImVec2(300, 0));
	ImGui::Begin("NIMA");

	// List of animations.
	auto animations = const_cast<std::vector<std::string>&>(fActor->getAnimations());
	ImGui::PushItemWidth(-1);
	if (ImGui::ListBox("Animations",
	&fAnimationIndex,
	vector_getter,
	reinterpret_cast<void*>(&animations),
	animations.size(),
	5)) {
	resetActor();
	}

	// Playback control.
	ImGui::Spacing();
	if (ImGui::Button("Play")) {
	fPlaying = true;
	}
	ImGui::SameLine();
	if (ImGui::Button("Pause")) {
	fPlaying = false;
	}

	// Time slider.
	ImGui::PushItemWidth(-1);
	ImGui::SliderFloat("Time", &fTime, 0.0f, fAnimation->max(), "Time: %.3f");

	// Backend control.
	int useImmediate = SkToBool(fRenderFlags & kImmediate_RenderFlag);
	ImGui::Spacing();
	ImGui::RadioButton("Skia Backend", &useImmediate, 0);
	ImGui::RadioButton("Immediate Backend", &useImmediate, 1);
	if (useImmediate) {
	fRenderFlags \|= kImmediate_RenderFlag;
	} else {
	fRenderFlags &= ~kImmediate_RenderFlag;
	}

	// Cache control.
	bool useCache = SkToBool(fRenderFlags & kCache_RenderFlag);
	ImGui::Spacing();
	ImGui::Checkbox("Cache Vertices", &useCache);
	if (useCache) {
	fRenderFlags \|= kCache_RenderFlag;
	} else {
	fRenderFlags &= ~kCache_RenderFlag;
	}

	// Bounding box toggle.
	bool drawBounds = SkToBool(fRenderFlags & kBounds_RenderFlag);
	ImGui::Spacing();
	ImGui::Checkbox("Draw Bounds", &drawBounds);
	if (drawBounds) {
	fRenderFlags \|= kBounds_RenderFlag;
	} else {
	fRenderFlags &= ~kBounds_RenderFlag;
	}

	ImGui::End();
	}