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skia2/experimental/skottiekit/skottiekit_bindings.cpp
Adlai Holler dd09d6e2ef Migrate skottiekit to GrDirectContext 
Change-Id: I6767070f63ba19a61ac6766254b9e524b7bbc8a3
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/326901
Reviewed-by: Kevin Lubick <kjlubick@google.com>
Commit-Queue: Adlai Holler <adlai@google.com>
2020-10-15 13:27:16 +00:00

454 lines
18 KiB
C++
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/*
* Copyright 2020 Google LLC
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "include/core/SkCanvas.h"
#include "include/core/SkColor.h"
#include "include/core/SkImage.h"
#include "include/core/SkPaint.h"
#include "include/core/SkRect.h"
#include "include/core/SkSize.h"
#include "include/core/SkString.h"
#include "include/core/SkSurface.h"
#include "include/core/SkTypes.h"
#include "modules/skottie/include/Skottie.h"
#include "modules/sksg/include/SkSGInvalidationController.h"
#include <string>
#include <vector>
#include <emscripten.h>
#include <emscripten/bind.h>
#if SK_INCLUDE_MANAGED_SKOTTIE
#include "modules/skottie/utils/SkottieUtils.h"
#include "modules/skresources/include/SkResources.h"
#endif // SK_INCLUDE_MANAGED_SKOTTIE
#ifdef SK_GL
#include "include/core/SkImageInfo.h"
#include "include/gpu/GrBackendSurface.h"
#include "include/gpu/GrDirectContext.h"
#include "include/gpu/gl/GrGLInterface.h"
#include "include/gpu/gl/GrGLTypes.h"
#include <GL/gl.h>
#include <emscripten/html5.h>
#endif
using namespace emscripten;
// Self-documenting types
using JSArray = emscripten::val;
using JSObject = emscripten::val;
using JSString = emscripten::val;
using SkPathOrNull = emscripten::val;
using Uint8Array = emscripten::val;
using Float32Array = emscripten::val;
#if SK_INCLUDE_MANAGED_SKOTTIE
namespace {
class SkottieAssetProvider : public skottie::ResourceProvider {
public:
~SkottieAssetProvider() override = default;
// Tried using a map, but that gave strange errors like
// https://emscripten.org/docs/porting/guidelines/function_pointer_issues.html
// Not entirely sure why, but perhaps the iterator in the map was
// confusing enscripten.
using AssetVec = std::vector<std::pair<SkString, sk_sp<SkData>>>;
static sk_sp<SkottieAssetProvider> Make(AssetVec assets) {
if (assets.empty()) {
return nullptr;
}
return sk_sp<SkottieAssetProvider>(new SkottieAssetProvider(std::move(assets)));
}
sk_sp<skottie::ImageAsset> loadImageAsset(const char[] /* path */,
const char name[],
const char[] /* id */) const override {
// For CK/Skottie we ignore paths & IDs, and identify images based solely on name.
if (auto data = this->findAsset(name)) {
return skresources::MultiFrameImageAsset::Make(std::move(data));
}
return nullptr;
}
sk_sp<SkData> loadFont(const char name[], const char[] /* url */) const override {
// Same as images paths, we ignore font URLs.
return this->findAsset(name);
}
private:
explicit SkottieAssetProvider(AssetVec assets) : fAssets(std::move(assets)) {}
sk_sp<SkData> findAsset(const char name[]) const {
for (const auto& asset : fAssets) {
if (asset.first.equals(name)) {
return asset.second;
}
}
SkDebugf("Could not find %s\n", name);
return nullptr;
}
const AssetVec fAssets;
};
class ManagedAnimation final : public SkRefCnt {
public:
static sk_sp<ManagedAnimation> Make(const std::string& json,
sk_sp<skottie::ResourceProvider> rp) {
auto mgr = std::make_unique<skottie_utils::CustomPropertyManager>();
auto animation = skottie::Animation::Builder()
.setMarkerObserver(mgr->getMarkerObserver())
.setPropertyObserver(mgr->getPropertyObserver())
.setResourceProvider(rp)
.make(json.c_str(), json.size());
return animation
? sk_sp<ManagedAnimation>(new ManagedAnimation(std::move(animation), std::move(mgr)))
: nullptr;
}
~ManagedAnimation() override = default;
// skottie::Animation API
void render(SkCanvas* canvas) const { fAnimation->render(canvas, nullptr); }
void render(SkCanvas* canvas, const SkRect& dst) const { fAnimation->render(canvas, &dst); }
// Returns a damage rect.
SkRect seek(SkScalar t) {
sksg::InvalidationController ic;
fAnimation->seek(t, &ic);
return ic.bounds();
}
// Returns a damage rect.
SkRect seekFrame(double t) {
sksg::InvalidationController ic;
fAnimation->seekFrame(t, &ic);
return ic.bounds();
}
double duration() const { return fAnimation->duration(); }
double fps() const { return fAnimation->fps(); }
const SkSize& size() const { return fAnimation->size(); }
std::string version() const { return std::string(fAnimation->version().c_str()); }
// CustomPropertyManager API
JSArray getColorProps() const {
JSArray props = emscripten::val::array();
for (const auto& cp : fPropMgr->getColorProps()) {
JSObject prop = emscripten::val::object();
prop.set("key", cp);
prop.set("value", fPropMgr->getColor(cp));
props.call<void>("push", prop);
}
return props;
}
JSArray getOpacityProps() const {
JSArray props = emscripten::val::array();
for (const auto& op : fPropMgr->getOpacityProps()) {
JSObject prop = emscripten::val::object();
prop.set("key", op);
prop.set("value", fPropMgr->getOpacity(op));
props.call<void>("push", prop);
}
return props;
}
bool setColor(const std::string& key, SkColor c) {
return fPropMgr->setColor(key, c);
}
bool setOpacity(const std::string& key, float o) {
return fPropMgr->setOpacity(key, o);
}
JSArray getMarkers() const {
JSArray markers = emscripten::val::array();
for (const auto& m : fPropMgr->markers()) {
JSObject marker = emscripten::val::object();
marker.set("name", m.name);
marker.set("t0" , m.t0);
marker.set("t1" , m.t1);
markers.call<void>("push", marker);
}
return markers;
}
private:
ManagedAnimation(sk_sp<skottie::Animation> animation,
std::unique_ptr<skottie_utils::CustomPropertyManager> propMgr)
: fAnimation(std::move(animation))
, fPropMgr(std::move(propMgr)) {}
sk_sp<skottie::Animation> fAnimation;
std::unique_ptr<skottie_utils::CustomPropertyManager> fPropMgr;
};
} // anonymous ns
#endif // SK_INCLUDE_MANAGED_SKOTTIE
struct SimpleImageInfo {
int width;
int height;
SkColorType colorType;
SkAlphaType alphaType;
// TODO color spaces?
};
SkImageInfo toSkImageInfo(const SimpleImageInfo& sii) {
return SkImageInfo::Make(sii.width, sii.height, sii.colorType, sii.alphaType);
}
#ifdef SK_GL
sk_sp<GrDirectContext> MakeGrContext(EMSCRIPTEN_WEBGL_CONTEXT_HANDLE context)
{
EMSCRIPTEN_RESULT r = emscripten_webgl_make_context_current(context);
if (r < 0) {
printf("failed to make webgl context current %d\n", r);
return nullptr;
}
// setup GrDirectContext
auto interface = GrGLMakeNativeInterface();
return GrDirectContext::MakeGL(interface);
}
sk_sp<SkSurface> MakeOnScreenGLSurface(sk_sp<GrDirectContext> grContext, int width, int height) {
glClearColor(0, 0, 0, 0);
glClearStencil(0);
glClear(GL_COLOR_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
// Wrap the frame buffer object attached to the screen in a Skia render
// target so Skia can render to it
GrGLint buffer;
glGetIntegerv(GL_FRAMEBUFFER_BINDING, &buffer);
GrGLFramebufferInfo info;
info.fFBOID = (GrGLuint) buffer;
SkColorType colorType;
GrGLint stencil;
glGetIntegerv(GL_STENCIL_BITS, &stencil);
info.fFormat = GL_RGBA8;
colorType = kRGBA_8888_SkColorType;
GrBackendRenderTarget target(width, height, 0, stencil, info);
sk_sp<SkSurface> surface(SkSurface::MakeFromBackendRenderTarget(grContext.get(), target,
kBottomLeft_GrSurfaceOrigin,
colorType, nullptr, nullptr));
return surface;
}
sk_sp<SkSurface> MakeRenderTarget(sk_sp<GrDirectContext> grContext, int width, int height) {
SkImageInfo info = SkImageInfo::MakeN32(width, height, SkAlphaType::kPremul_SkAlphaType);
sk_sp<SkSurface> surface(SkSurface::MakeRenderTarget(grContext.get(),
SkBudgeted::kYes,
info, 0,
kBottomLeft_GrSurfaceOrigin,
nullptr, true));
return surface;
}
sk_sp<SkSurface> MakeRenderTarget(sk_sp<GrDirectContext> grContext, SimpleImageInfo sii) {
sk_sp<SkSurface> surface(SkSurface::MakeRenderTarget(grContext.get(),
SkBudgeted::kYes,
toSkImageInfo(sii), 0,
kBottomLeft_GrSurfaceOrigin,
nullptr, true));
return surface;
}
#endif // SK_GL
// Some signatures below have uintptr_t instead of a pointer to a primitive
// type (e.g. SkScalar). This is necessary because we can't use "bind" (EMSCRIPTEN_BINDINGS)
// and pointers to primitive types (Only bound types like SkPoint). We could if we used
// cwrap (see https://becominghuman.ai/passing-and-returning-webassembly-array-parameters-a0f572c65d97)
// but that requires us to stick to C code and, AFAIK, doesn't allow us to return nice things like
// SkPath or SkCanvas.
//
// So, basically, if we are using C++ and EMSCRIPTEN_BINDINGS, we can't have primitive pointers
// in our function type signatures. (this gives an error message like "Cannot call foo due to unbound
// types Pi, Pf"). But, we can just pretend they are numbers and cast them to be pointers and
// the compiler is happy.
EMSCRIPTEN_BINDINGS(Skottie) {
#ifdef SK_GL
function("currentContext", &emscripten_webgl_get_current_context);
function("setCurrentContext", &emscripten_webgl_make_context_current);
function("MakeGrContext", &MakeGrContext);
function("MakeOnScreenGLSurface", &MakeOnScreenGLSurface);
function("MakeRenderTarget",
select_overload<sk_sp<SkSurface>(sk_sp<GrDirectContext>, int, int)>(&MakeRenderTarget));
function("MakeRenderTarget",
select_overload<sk_sp<SkSurface>(sk_sp<GrDirectContext>, SimpleImageInfo)>(&MakeRenderTarget));
constant("gpu", true);
class_<GrDirectContext>("GrDirectContext")
.smart_ptr<sk_sp<GrDirectContext>>("sk_sp<GrDirectContext>");
// .function("getResourceCacheLimitBytes", optional_override([](GrDirectContext& self)->size_t {
// int maxResources = 0;// ignored
// size_t currMax = 0;
// self.getResourceCacheLimits(&maxResources, &currMax);
// return currMax;
// }))
// .function("getResourceCacheUsageBytes", optional_override([](GrDirectContext& self)->size_t {
// int usedResources = 0;// ignored
// size_t currUsage = 0;
// self.getResourceCacheUsage(&usedResources, &currUsage);
// return currUsage;
// }))
// .function("releaseResourcesAndAbandonContext", &GrDirectContext::releaseResourcesAndAbandonContext)
// .function("setResourceCacheLimitBytes", optional_override([](GrDirectContext& self, size_t maxResourceBytes) {
// int maxResources = 0;
// size_t currMax = 0; // ignored
// self.getResourceCacheLimits(&maxResources, &currMax);
// self.setResourceCacheLimits(maxResources, maxResourceBytes);
// }));
#endif
// function("getDecodeCacheLimitBytes", &SkResourceCache::GetTotalByteLimit);
// function("setDecodeCacheLimitBytes", &SkResourceCache::SetTotalByteLimit);
// function("getDecodeCacheUsedBytes" , &SkResourceCache::GetTotalBytesUsed);
function("_getRasterDirectSurface", optional_override([](const SimpleImageInfo ii,
uintptr_t /* uint8_t* */ pPtr,
size_t rowBytes)->sk_sp<SkSurface> {
uint8_t* pixels = reinterpret_cast<uint8_t*>(pPtr);
SkImageInfo imageInfo = toSkImageInfo(ii);
return SkSurface::MakeRasterDirect(imageInfo, pixels, rowBytes, nullptr);
}), allow_raw_pointers());
class_<SkCanvas>("SkCanvas")
.function("_clear", optional_override([](SkCanvas& self, uintptr_t /* float* */ cPtr) {
// See comment above for uintptr_t explanation
float* fourFloats = reinterpret_cast<float*>(cPtr);
SkColor4f color = { fourFloats[0], fourFloats[1], fourFloats[2], fourFloats[3]};
// TODO(reed): SkCanvas.clear() should take SkColor4f, then we could just use it here.
SkPaint p;
p.setBlendMode(SkBlendMode::kSrc);
p.setColor4f(color);
self.drawPaint(p);
}));
class_<SkSurface>("SkSurface")
.smart_ptr<sk_sp<SkSurface>>("sk_sp<SkSurface>")
.function("_flush", select_overload<void()>(&SkSurface::flush))
.function("getCanvas", &SkSurface::getCanvas, allow_raw_pointers());
class_<skottie::Animation>("Animation")
.smart_ptr<sk_sp<skottie::Animation>>("sk_sp<Animation>")
.function("version", optional_override([](skottie::Animation& self)->std::string {
return std::string(self.version().c_str());
}))
.function("size" , &skottie::Animation::size)
.function("duration", &skottie::Animation::duration)
.function("fps" , &skottie::Animation::fps)
.function("seek", optional_override([](skottie::Animation& self, SkScalar t)->void {
self.seek(t);
}))
.function("seekFrame", optional_override([](skottie::Animation& self, double t)->void {
self.seekFrame(t);
}))
.function("render", optional_override([](skottie::Animation& self, SkCanvas* canvas)->void {
self.render(canvas, nullptr);
}), allow_raw_pointers())
.function("render", optional_override([](skottie::Animation& self, SkCanvas* canvas,
const SkRect r)->void {
self.render(canvas, &r);
}), allow_raw_pointers());
function("MakeAnimation", optional_override([](std::string json)->sk_sp<skottie::Animation> {
return skottie::Animation::Make(json.c_str(), json.length());
}));
constant("skottie", true);
#if SK_INCLUDE_MANAGED_SKOTTIE
class_<ManagedAnimation>("ManagedAnimation")
.smart_ptr<sk_sp<ManagedAnimation>>("sk_sp<ManagedAnimation>")
.function("version" , &ManagedAnimation::version)
.function("size" , &ManagedAnimation::size)
.function("duration" , &ManagedAnimation::duration)
.function("fps" , &ManagedAnimation::fps)
.function("seek" , &ManagedAnimation::seek)
.function("seekFrame" , &ManagedAnimation::seekFrame)
.function("render" , select_overload<void(SkCanvas*) const>(&ManagedAnimation::render), allow_raw_pointers())
.function("render" , select_overload<void(SkCanvas*, const SkRect&) const>
(&ManagedAnimation::render), allow_raw_pointers());
// .function("setColor" , optional_override([](ManagedAnimation& self, const std::string& key, SimpleColor4f c) {
// self.setColor(key, c.toSkColor());
// }))
// .function("setOpacity", &ManagedAnimation::setOpacity)
// .function("getMarkers", &ManagedAnimation::getMarkers)
// .function("getColorProps" , &ManagedAnimation::getColorProps)
// .function("getOpacityProps", &ManagedAnimation::getOpacityProps);
function("_MakeManagedAnimation", optional_override([](std::string json,
size_t assetCount,
uintptr_t /* char** */ nptr,
uintptr_t /* uint8_t** */ dptr,
uintptr_t /* size_t* */ sptr)
->sk_sp<ManagedAnimation> {
// See the comment in canvaskit_bindings.cpp about the use of uintptr_t
const auto assetNames = reinterpret_cast<char** >(nptr);
const auto assetDatas = reinterpret_cast<uint8_t**>(dptr);
const auto assetSizes = reinterpret_cast<size_t* >(sptr);
SkottieAssetProvider::AssetVec assets;
assets.reserve(assetCount);
for (size_t i = 0; i < assetCount; i++) {
auto name = SkString(assetNames[i]);
auto bytes = SkData::MakeFromMalloc(assetDatas[i], assetSizes[i]);
assets.push_back(std::make_pair(std::move(name), std::move(bytes)));
}
return ManagedAnimation::Make(json,
skresources::DataURIResourceProviderProxy::Make(
SkottieAssetProvider::Make(std::move(assets))));
}));
constant("managed_skottie", true);
#endif // SK_INCLUDE_MANAGED_SKOTTIE
value_object<SimpleImageInfo>("SkImageInfo")
.field("width", &SimpleImageInfo::width)
.field("height", &SimpleImageInfo::height)
.field("colorType", &SimpleImageInfo::colorType)
.field("alphaType", &SimpleImageInfo::alphaType);
value_object<SkRect>("SkRect")
.field("fLeft", &SkRect::fLeft)
.field("fTop", &SkRect::fTop)
.field("fRight", &SkRect::fRight)
.field("fBottom", &SkRect::fBottom);
// {"w": Number, "h", Number}
value_object<SkSize>("SkSize")
.field("w", &SkSize::fWidth)
.field("h", &SkSize::fHeight);
enum_<SkAlphaType>("AlphaType")
.value("Opaque", SkAlphaType::kOpaque_SkAlphaType)
.value("Premul", SkAlphaType::kPremul_SkAlphaType)
.value("Unpremul", SkAlphaType::kUnpremul_SkAlphaType);
enum_<SkColorType>("ColorType")
.value("RGBA_8888", SkColorType::kRGBA_8888_SkColorType);
}
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