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DrawableFrameHostObject subclass
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,35 @@ | ||
| // | ||
| // DrawableFrameHostObject.h | ||
| // VisionCamera | ||
| // | ||
| // Created by Marc Rousavy on 20.07.23. | ||
| // Copyright © 2023 mrousavy. All rights reserved. | ||
| // | ||
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| #pragma once | ||
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| #import <jsi/jsi.h> | ||
| #import "../Frame Processor/FrameHostObject.h" | ||
| #import "../Frame Processor/Frame.h" | ||
| #import <CoreMedia/CMSampleBuffer.h> | ||
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| #import "SkCanvas.h" | ||
| #import "JsiSkCanvas.h" | ||
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| using namespace facebook; | ||
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| class JSI_EXPORT DrawableFrameHostObject: public FrameHostObject { | ||
| public: | ||
| explicit DrawableFrameHostObject(Frame* frame, | ||
| std::shared_ptr<RNSkia::JsiSkCanvas> canvas): | ||
| FrameHostObject(frame), _canvas(canvas) {} | ||
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| public: | ||
| jsi::Value get(jsi::Runtime&, const jsi::PropNameID& name) override; | ||
| std::vector<jsi::PropNameID> getPropertyNames(jsi::Runtime& rt) override; | ||
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| void invalidateCanvas(); | ||
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| private: | ||
| std::shared_ptr<RNSkia::JsiSkCanvas> _canvas; | ||
| }; |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,80 @@ | ||
| // | ||
| // DrawableFrameHostObject.mm | ||
| // VisionCamera | ||
| // | ||
| // Created by Marc Rousavy on 20.07.23. | ||
| // Copyright © 2023 mrousavy. All rights reserved. | ||
| // | ||
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| #import "DrawableFrameHostObject.h" | ||
| #import "SkCanvas.h" | ||
| #import "SkImageHelpers.h" | ||
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| std::vector<jsi::PropNameID> DrawableFrameHostObject::getPropertyNames(jsi::Runtime& rt) { | ||
| auto result = FrameHostObject::getPropertyNames(rt); | ||
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| // Skia - Render Frame | ||
| result.push_back(jsi::PropNameID::forUtf8(rt, std::string("render"))); | ||
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| if (_canvas != nullptr) { | ||
| auto canvasPropNames = _canvas->getPropertyNames(rt); | ||
| for (auto& prop : canvasPropNames) { | ||
| result.push_back(std::move(prop)); | ||
| } | ||
| } | ||
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| return result; | ||
| } | ||
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| SkRect inscribe(SkSize size, SkRect rect) { | ||
| auto halfWidthDelta = (rect.width() - size.width()) / 2.0; | ||
| auto halfHeightDelta = (rect.height() - size.height()) / 2.0; | ||
| return SkRect::MakeXYWH(rect.x() + halfWidthDelta, | ||
| rect.y() + halfHeightDelta, size.width(), | ||
| size.height()); | ||
| } | ||
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| jsi::Value DrawableFrameHostObject::get(jsi::Runtime& runtime, const jsi::PropNameID& propName) { | ||
| auto name = propName.utf8(runtime); | ||
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| if (name == "render") { | ||
| auto render = JSI_HOST_FUNCTION_LAMBDA { | ||
| if (_canvas == nullptr) { | ||
| throw jsi::JSError(runtime, "Trying to render a Frame without a Skia Canvas! Did you install Skia?"); | ||
| } | ||
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| // convert CMSampleBuffer to SkImage | ||
| auto context = _canvas->getCanvas()->recordingContext(); | ||
| auto image = SkImageHelpers::convertCMSampleBufferToSkImage(context, frame.buffer); | ||
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| // draw SkImage | ||
| if (count > 0) { | ||
| // ..with paint/shader | ||
| auto paintHostObject = arguments[0].asObject(runtime).asHostObject<RNSkia::JsiSkPaint>(runtime); | ||
| auto paint = paintHostObject->getObject(); | ||
| _canvas->getCanvas()->drawImage(image, 0, 0, SkSamplingOptions(), paint.get()); | ||
| } else { | ||
| // ..without paint/shader | ||
| _canvas->getCanvas()->drawImage(image, 0, 0); | ||
| } | ||
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| return jsi::Value::undefined(); | ||
| }; | ||
| return jsi::Function::createFromHostFunction(runtime, jsi::PropNameID::forUtf8(runtime, "render"), 1, render); | ||
| } | ||
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| if (_canvas != nullptr) { | ||
| // If we have a Canvas, try to access the property on there. | ||
| auto result = _canvas->get(runtime, propName); | ||
| if (!result.isUndefined()) { | ||
| return result; | ||
| } | ||
| } | ||
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| // fallback to base implementation | ||
| return FrameHostObject::get(runtime, propName); | ||
| } | ||
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| void DrawableFrameHostObject::invalidateCanvas() { | ||
| _canvas = nullptr; | ||
| } |
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