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Charles Parker
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Charles Parker
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,35 +1,3 @@ | ||
| import React from "react"; | ||
| import { type ViewStyle, Text, Platform } from "react-native"; | ||
| import { | ||
| Camera, | ||
| useCameraDevice, | ||
| type CameraPosition, | ||
| type FrameProcessor, | ||
| } from "react-native-vision-camera"; | ||
|
|
||
| export type MediapipeCameraProps = { | ||
| style: ViewStyle; | ||
| processor: FrameProcessor; | ||
| activeCamera: CameraPosition; | ||
| }; | ||
|
|
||
| export const MediapipeCamera: React.FC<MediapipeCameraProps> = ({ | ||
| style, | ||
| processor, | ||
| activeCamera, | ||
| }) => { | ||
| const device = useCameraDevice(activeCamera); | ||
| return device !== undefined ? ( | ||
| <Camera | ||
| style={style} | ||
| device={device} | ||
| pixelFormat={Platform.select({ ios: "rgb", android: "yuv" })} | ||
| isActive={true} | ||
| frameProcessor={processor} | ||
| /> | ||
| ) : ( | ||
| <Text>no device</Text> | ||
| ); | ||
| }; | ||
|
|
||
| export * from "./objectDetection"; | ||
| export * from "./shared/mediapipeCamera"; | ||
| export * from "./shared/convert"; |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,128 @@ | ||
| export type Dims = { width: number; height: number }; | ||
| export type Point = { x: number; y: number }; | ||
| export type RectXYWH = { x: number; y: number; width: number; height: number }; | ||
| export type RectLTRB = { | ||
| left: number; | ||
| top: number; | ||
| right: number; | ||
| bottom: number; | ||
| }; | ||
| export type ResizeMode = "cover" | "contain"; | ||
|
|
||
| // both cover and contain preserve aspect ratio. Cover will crop the image to fill the view, contain will show the whole image and add padding. | ||
| // for cover, if the aspect ratio x/y of the frame is greater than | ||
| export function framePointToView( | ||
| point: Point, | ||
| frameDims: Dims, | ||
| viewDims: Dims, | ||
| mode: ResizeMode | ||
| ): Point { | ||
| const frameRatio = frameDims.width / frameDims.height; | ||
| const viewRatio = viewDims.width / viewDims.height; | ||
| let scale = 1; | ||
| let xoffset = 0; | ||
| let yoffset = 0; | ||
| if (mode === "contain") { | ||
| // contain means that the frame rect will be smaller than the view rect, | ||
| // if the w/h ratio of the frame is greater than the w/h ratio of the view, | ||
| // then equal in the x dimension, smaller in the y dimension | ||
| // else the other way around | ||
| if (frameRatio > viewRatio) { | ||
| scale = viewDims.width / frameDims.width; | ||
| xoffset = 0; | ||
| yoffset = (viewDims.height - frameDims.height * scale) / 2; | ||
| } else { | ||
| scale = viewDims.height / frameDims.height; | ||
| xoffset = (viewDims.width - frameDims.width * scale) / 2; | ||
| yoffset = 0; | ||
| } | ||
| } else { | ||
| if (frameRatio > viewRatio) { | ||
| scale = viewDims.height / frameDims.height; | ||
| xoffset = (viewDims.width - frameDims.width * scale) / 2; | ||
| yoffset = 0; | ||
| } else { | ||
| scale = viewDims.width / frameDims.width; | ||
| xoffset = 0; | ||
| yoffset = (viewDims.height - frameDims.height * scale) / 2; | ||
| } | ||
| } | ||
| return { | ||
| x: point.x * scale + xoffset, | ||
| y: point.y * scale + yoffset, | ||
| }; | ||
| } | ||
|
|
||
| function frameRectLTRBToView( | ||
| rect: RectLTRB, | ||
| frameDims: Dims, | ||
| viewDims: Dims, | ||
| mode: ResizeMode | ||
| ): RectLTRB { | ||
| const lt = framePointToView( | ||
| { x: rect.left, y: rect.top }, | ||
| frameDims, | ||
| viewDims, | ||
| mode | ||
| ); | ||
| const rb = framePointToView( | ||
| { x: rect.right, y: rect.bottom }, | ||
| frameDims, | ||
| viewDims, | ||
| mode | ||
| ); | ||
| return { left: lt.x, top: lt.y, right: rb.x, bottom: rb.y }; | ||
| } | ||
|
|
||
| function frameRectXYWHToView( | ||
| rect: RectXYWH, | ||
| frameDims: Dims, | ||
| viewDims: Dims, | ||
| mode: ResizeMode | ||
| ): RectXYWH { | ||
| const lt = framePointToView( | ||
| { x: rect.x, y: rect.y }, | ||
| frameDims, | ||
| viewDims, | ||
| mode | ||
| ); | ||
| const rb = framePointToView( | ||
| { x: rect.x + rect.width, y: rect.y + rect.height }, | ||
| frameDims, | ||
| viewDims, | ||
| mode | ||
| ); | ||
| return { x: lt.x, y: lt.y, width: rb.x - lt.x, height: rb.y - lt.y }; | ||
| } | ||
|
|
||
| function isRectLTRB(rect: unknown): rect is RectLTRB { | ||
| return ( | ||
| typeof rect === "object" && | ||
| "left" in (rect as object) && | ||
| "top" in (rect as object) && | ||
| "right" in (rect as object) && | ||
| "bottom" in (rect as object) | ||
| ); | ||
| } | ||
|
|
||
| export function frameRectToView<TRect extends RectLTRB | RectXYWH>( | ||
| rect: TRect, | ||
| frameDims: Dims, | ||
| viewDims: Dims, | ||
| mode: ResizeMode | ||
| ): TRect { | ||
| if (isRectLTRB(rect)) { | ||
| return frameRectLTRBToView(rect, frameDims, viewDims, mode) as TRect; | ||
| } else { | ||
| return frameRectXYWHToView(rect, frameDims, viewDims, mode) as TRect; | ||
| } | ||
| } | ||
|
|
||
| export function ltrbToXywh(rect: RectLTRB): RectXYWH { | ||
| return { | ||
| x: rect.left, | ||
| y: rect.top, | ||
| width: rect.right - rect.left, | ||
| height: rect.bottom - rect.top, | ||
| }; | ||
| } |
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