krossford

uiLabel.text = "\u{00a0}     Hello World     \u{200c}"

krossford

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

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

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))