kross krossford
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krossford
/ gist:fece10384b8dac5da134fd3539496618
Created
November 24, 2020 10:26
IOS UILabel starting or ending with extra whitespaces.
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| uiLabel.text = "\u{00a0} Hello World \u{200c}" |
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| from PIL import Image | |
| img = Image.open("cat.jpg") | |
| # 图片尺寸 | |
| print(img.size) | |
| img.size[0] # 宽度 | |
| img.size[1] # 高度 | |
| # 操作像素 |
krossford
/ Create Texture from CMSampleBuffer.swift
Created
July 22, 2020 03:55
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| private func createTexture(sampleBuffer: CMSampleBuffer, planeIndex: Int, pixelFormat: MTLPixelFormat) throws -> MTLTexture { | |
| guard let cvImageBuffer = CMSampleBufferGetImageBuffer(sampleBuffer) else { | |
| throw MyError.normal | |
| } | |
| let isPlanar = CVPixelBufferIsPlanar(cvImageBuffer) | |
| let width = isPlanar ? CVPixelBufferGetWidthOfPlane(cvImageBuffer, planeIndex) : CVPixelBufferGetWidth(cvImageBuffer) | |
| let height = isPlanar ? CVPixelBufferGetHeightOfPlane(cvImageBuffer, planeIndex) : CVPixelBufferGetHeight(cvImageBuffer) | |
| var cvMetalTexture: CVMetalTexture? | |
| CVMetalTextureCacheCreateTextureFromImage(nil, _textureCache!, cvImageBuffer, nil, pixelFormat, width, height, planeIndex, &cvMetalTexture) |
krossford
/ CMSampleBuffer如何显示到View上.swift
Created
July 22, 2020 03:47
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| sampleBuffer: CMSampleBuffer | |
| guard let formatDesc = CMSampleBufferGetFormatDescription(sampleBuffer) else { return } | |
| let dimension = CMVideoFormatDescriptionGetDimensions(formatDesc) | |
| var ciImage = CIImage(cvImageBuffer: cvImageBuffer, options: nil) | |
| // 负数是顺时针旋转 | |
| ciImage = ciImage.transformed(by: CGAffineTransform(rotationAngle: -1 * CGFloat.pi / 2)) |