mirror of
https://github.com/Swiftgram/Telegram-iOS.git
synced 2025-06-16 05:55:20 +00:00
342 lines
14 KiB
Swift
342 lines
14 KiB
Swift
import Foundation
|
|
import UIKit
|
|
|
|
let deviceColorSpace = CGColorSpaceCreateDeviceRGB()
|
|
let deviceScale = UIScreen.main.scale
|
|
|
|
public func generateImagePixel(_ size: CGSize, pixelGenerator: (CGSize, UnsafeMutablePointer<Int8>) -> Void) -> UIImage? {
|
|
let scale = deviceScale
|
|
let scaledSize = CGSize(width: size.width * scale, height: size.height * scale)
|
|
let bytesPerRow = (4 * Int(scaledSize.width) + 15) & (~15)
|
|
let length = bytesPerRow * Int(scaledSize.height)
|
|
let bytes = malloc(length)!.assumingMemoryBound(to: Int8.self)
|
|
guard let provider = CGDataProvider(dataInfo: bytes, data: bytes, size: length, releaseData: { bytes, _, _ in
|
|
free(bytes)
|
|
})
|
|
else {
|
|
return nil
|
|
}
|
|
|
|
pixelGenerator(scaledSize, bytes)
|
|
|
|
let bitmapInfo = CGBitmapInfo(rawValue: CGBitmapInfo.byteOrder32Little.rawValue | CGImageAlphaInfo.premultipliedFirst.rawValue)
|
|
|
|
guard let image = CGImage(width: Int(scaledSize.width), height: Int(scaledSize.height), bitsPerComponent: 8, bitsPerPixel: 32, bytesPerRow: bytesPerRow, space: deviceColorSpace, bitmapInfo: bitmapInfo, provider: provider, decode: nil, shouldInterpolate: false, intent: .defaultIntent)
|
|
else {
|
|
return nil
|
|
}
|
|
|
|
return UIImage(cgImage: image, scale: scale, orientation: .up)
|
|
}
|
|
|
|
public func generateImage(_ size: CGSize, contextGenerator: (CGSize, CGContext) -> Void, opaque: Bool = false) -> UIImage? {
|
|
let scale = deviceScale
|
|
let scaledSize = CGSize(width: size.width * scale, height: size.height * scale)
|
|
let bytesPerRow = (4 * Int(scaledSize.width) + 15) & (~15)
|
|
let length = bytesPerRow * Int(scaledSize.height)
|
|
let bytes = malloc(length)!.assumingMemoryBound(to: Int8.self)
|
|
|
|
guard let provider = CGDataProvider(dataInfo: bytes, data: bytes, size: length, releaseData: { bytes, _, _ in
|
|
free(bytes)
|
|
})
|
|
else {
|
|
return nil
|
|
}
|
|
|
|
let bitmapInfo = CGBitmapInfo(rawValue: CGBitmapInfo.byteOrder32Little.rawValue | (opaque ? CGImageAlphaInfo.noneSkipFirst.rawValue : CGImageAlphaInfo.premultipliedFirst.rawValue))
|
|
|
|
guard let context = CGContext(data: bytes, width: Int(scaledSize.width), height: Int(scaledSize.height), bitsPerComponent: 8, bytesPerRow: bytesPerRow, space: deviceColorSpace, bitmapInfo: bitmapInfo.rawValue)
|
|
else {
|
|
return nil
|
|
}
|
|
|
|
context.scaleBy(x: scale, y: scale)
|
|
|
|
contextGenerator(size, context)
|
|
|
|
guard let image = CGImage(width: Int(scaledSize.width), height: Int(scaledSize.height), bitsPerComponent: 8, bitsPerPixel: 32, bytesPerRow: bytesPerRow, space: deviceColorSpace, bitmapInfo: bitmapInfo, provider: provider, decode: nil, shouldInterpolate: false, intent: .defaultIntent)
|
|
else {
|
|
return nil
|
|
}
|
|
|
|
return UIImage(cgImage: image, scale: scale, orientation: .up)
|
|
}
|
|
|
|
public func generateFilledCircleImage(radius: CGFloat, color: UIColor?, backgroundColor: UIColor? = nil) -> UIImage? {
|
|
return generateImage(CGSize(width: radius * 2.0, height: radius * 2.0), contextGenerator: { size, context in
|
|
context.clear(CGRect(origin: CGPoint(), size: size))
|
|
if let backgroundColor = backgroundColor {
|
|
context.setFillColor(backgroundColor.cgColor)
|
|
context.fill(CGRect(origin: CGPoint(), size: size))
|
|
}
|
|
|
|
if let color = color {
|
|
context.setFillColor(color.cgColor)
|
|
} else {
|
|
context.setFillColor(UIColor.clear.cgColor)
|
|
context.setBlendMode(.copy)
|
|
}
|
|
context.fillEllipse(in: CGRect(origin: CGPoint(), size: size))
|
|
})
|
|
}
|
|
|
|
public func generateStretchableFilledCircleImage(radius: CGFloat, color: UIColor?, backgroundColor: UIColor? = nil) -> UIImage? {
|
|
return generateFilledCircleImage(radius: radius, color: color, backgroundColor: backgroundColor)?.stretchableImage(withLeftCapWidth: Int(radius), topCapHeight: Int(radius))
|
|
}
|
|
|
|
public func generateTintedImage(image: UIImage?, color: UIColor, backgroundColor: UIColor? = nil) -> UIImage? {
|
|
guard let image = image else {
|
|
return nil
|
|
}
|
|
|
|
let imageSize = image.size
|
|
|
|
UIGraphicsBeginImageContextWithOptions(imageSize, backgroundColor != nil, image.scale)
|
|
if let context = UIGraphicsGetCurrentContext() {
|
|
if let backgroundColor = backgroundColor {
|
|
context.setFillColor(backgroundColor.cgColor)
|
|
context.fill(CGRect(origin: CGPoint(), size: imageSize))
|
|
}
|
|
|
|
let imageRect = CGRect(origin: CGPoint(), size: imageSize)
|
|
context.saveGState()
|
|
context.translateBy(x: imageRect.midX, y: imageRect.midY)
|
|
context.scaleBy(x: 1.0, y: -1.0)
|
|
context.translateBy(x: -imageRect.midX, y: -imageRect.midY)
|
|
context.clip(to: imageRect, mask: image.cgImage!)
|
|
context.setFillColor(color.cgColor)
|
|
context.fill(imageRect)
|
|
context.restoreGState()
|
|
}
|
|
|
|
let tintedImage = UIGraphicsGetImageFromCurrentImageContext()!
|
|
UIGraphicsEndImageContext()
|
|
|
|
return tintedImage
|
|
}
|
|
|
|
private func generateSingleColorImage(size: CGSize, color: UIColor) -> UIImage? {
|
|
return generateImage(size, contextGenerator: { size, context in
|
|
context.setFillColor(color.cgColor)
|
|
context.fill(CGRect(origin: CGPoint(), size: size))
|
|
})
|
|
}
|
|
|
|
public enum DrawingContextBltMode {
|
|
case Alpha
|
|
}
|
|
|
|
public class DrawingContext {
|
|
public let size: CGSize
|
|
public let scale: CGFloat
|
|
private let scaledSize: CGSize
|
|
public let bytesPerRow: Int
|
|
private let bitmapInfo: CGBitmapInfo
|
|
public let length: Int
|
|
public let bytes: UnsafeMutableRawPointer
|
|
let provider: CGDataProvider?
|
|
|
|
private var _context: CGContext?
|
|
|
|
public func withContext(_ f: @noescape(CGContext) -> ()) {
|
|
if self._context == nil {
|
|
if let c = CGContext(data: bytes, width: Int(scaledSize.width), height: Int(scaledSize.height), bitsPerComponent: 8, bytesPerRow: bytesPerRow, space: deviceColorSpace, bitmapInfo: self.bitmapInfo.rawValue) {
|
|
c.scaleBy(x: scale, y: scale)
|
|
self._context = c
|
|
}
|
|
}
|
|
|
|
if let _context = self._context {
|
|
_context.translateBy(x: self.size.width / 2.0, y: self.size.height / 2.0)
|
|
_context.scaleBy(x: 1.0, y: -1.0)
|
|
_context.translateBy(x: -self.size.width / 2.0, y: -self.size.height / 2.0)
|
|
|
|
f(_context)
|
|
|
|
_context.translateBy(x: self.size.width / 2.0, y: self.size.height / 2.0)
|
|
_context.scaleBy(x: 1.0, y: -1.0)
|
|
_context.translateBy(x: -self.size.width / 2.0, y: -self.size.height / 2.0)
|
|
}
|
|
}
|
|
|
|
public func withFlippedContext(_ f: @noescape(CGContext) -> ()) {
|
|
if self._context == nil {
|
|
if let c = CGContext(data: bytes, width: Int(scaledSize.width), height: Int(scaledSize.height), bitsPerComponent: 8, bytesPerRow: bytesPerRow, space: deviceColorSpace, bitmapInfo: self.bitmapInfo.rawValue) {
|
|
c.scaleBy(x: scale, y: scale)
|
|
self._context = c
|
|
}
|
|
}
|
|
|
|
if let _context = self._context {
|
|
f(_context)
|
|
}
|
|
}
|
|
|
|
public init(size: CGSize, scale: CGFloat = deviceScale, clear: Bool = false) {
|
|
self.size = size
|
|
self.scale = scale
|
|
self.scaledSize = CGSize(width: size.width * scale, height: size.height * scale)
|
|
|
|
self.bytesPerRow = (4 * Int(scaledSize.width) + 15) & (~15)
|
|
self.length = bytesPerRow * Int(scaledSize.height)
|
|
|
|
self.bitmapInfo = CGBitmapInfo(rawValue: CGBitmapInfo.byteOrder32Little.rawValue | CGImageAlphaInfo.premultipliedFirst.rawValue)
|
|
|
|
self.bytes = malloc(length)!
|
|
if clear {
|
|
memset(self.bytes, 0, self.length)
|
|
}
|
|
self.provider = CGDataProvider(dataInfo: bytes, data: bytes, size: length, releaseData: { bytes, _, _ in
|
|
free(bytes)
|
|
})
|
|
}
|
|
|
|
public func generateImage() -> UIImage? {
|
|
if let image = CGImage(width: Int(scaledSize.width), height: Int(scaledSize.height), bitsPerComponent: 8, bitsPerPixel: 32, bytesPerRow: bytesPerRow, space: deviceColorSpace, bitmapInfo: bitmapInfo, provider: provider!, decode: nil, shouldInterpolate: false, intent: .defaultIntent) {
|
|
return UIImage(cgImage: image, scale: scale, orientation: .up)
|
|
} else {
|
|
return nil
|
|
}
|
|
}
|
|
|
|
public func colorAt(_ point: CGPoint) -> UIColor {
|
|
let x = Int(point.x * self.scale)
|
|
let y = Int(point.y * self.scale)
|
|
if x >= 0 && x < Int(self.scaledSize.width) && y >= 0 && y < Int(self.scaledSize.height) {
|
|
let srcLine = self.bytes.advanced(by: y * self.bytesPerRow).assumingMemoryBound(to: UInt32.self)
|
|
let pixel = srcLine + x
|
|
let colorValue = pixel.pointee
|
|
return UIColor(UInt32(colorValue))
|
|
} else {
|
|
return UIColor.clear
|
|
}
|
|
}
|
|
|
|
public func blt(_ other: DrawingContext, at: CGPoint, mode: DrawingContextBltMode = .Alpha) {
|
|
if abs(other.scale - self.scale) < CGFloat(FLT_EPSILON) {
|
|
let srcX = 0
|
|
var srcY = 0
|
|
let dstX = Int(at.x * self.scale)
|
|
var dstY = Int(at.y * self.scale)
|
|
|
|
let width = min(Int(self.size.width * self.scale) - dstX, Int(other.size.width * self.scale))
|
|
let height = min(Int(self.size.height * self.scale) - dstY, Int(other.size.height * self.scale))
|
|
|
|
let maxDstX = dstX + width
|
|
let maxDstY = dstY + height
|
|
|
|
switch mode {
|
|
case .Alpha:
|
|
while dstY < maxDstY {
|
|
let srcLine = other.bytes.advanced(by: srcY * other.bytesPerRow).assumingMemoryBound(to: UInt32.self)
|
|
let dstLine = self.bytes.advanced(by: dstY * self.bytesPerRow).assumingMemoryBound(to: UInt32.self)
|
|
|
|
var dx = dstX
|
|
var sx = srcX
|
|
while dx < maxDstX {
|
|
let srcPixel = srcLine + sx
|
|
let dstPixel = dstLine + dx
|
|
|
|
let baseColor = dstPixel.pointee
|
|
let baseR = (baseColor >> 16) & 0xff
|
|
let baseG = (baseColor >> 8) & 0xff
|
|
let baseB = baseColor & 0xff
|
|
|
|
let alpha = srcPixel.pointee >> 24
|
|
|
|
let r = (baseR * alpha) / 255
|
|
let g = (baseG * alpha) / 255
|
|
let b = (baseB * alpha) / 255
|
|
|
|
dstPixel.pointee = (alpha << 24) | (r << 16) | (g << 8) | b
|
|
|
|
dx += 1
|
|
sx += 1
|
|
}
|
|
|
|
dstY += 1
|
|
srcY += 1
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
public enum ParsingError: Error {
|
|
case Generic
|
|
}
|
|
|
|
public func readCGFloat(_ index: inout UnsafePointer<UInt8>, end: UnsafePointer<UInt8>, separator: UInt8) throws -> CGFloat {
|
|
let begin = index
|
|
var seenPoint = false
|
|
while index <= end {
|
|
let c = index.pointee
|
|
index = index.successor()
|
|
|
|
if c == 46 { // .
|
|
if seenPoint {
|
|
throw ParsingError.Generic
|
|
} else {
|
|
seenPoint = true
|
|
}
|
|
} else if c == separator {
|
|
break
|
|
} else if c < 48 || c > 57 {
|
|
throw ParsingError.Generic
|
|
}
|
|
}
|
|
|
|
if index == begin {
|
|
throw ParsingError.Generic
|
|
}
|
|
|
|
if let value = NSString(bytes: UnsafePointer<Void>(begin), length: index - begin, encoding: String.Encoding.utf8.rawValue)?.floatValue {
|
|
return CGFloat(value)
|
|
} else {
|
|
throw ParsingError.Generic
|
|
}
|
|
}
|
|
|
|
public func drawSvgPath(_ context: CGContext, path: StaticString) throws {
|
|
var index: UnsafePointer<UInt8> = path.utf8Start
|
|
let end = path.utf8Start.advanced(by: path.utf8CodeUnitCount)
|
|
while index < end {
|
|
let c = index.pointee
|
|
index = index.successor()
|
|
|
|
if c == 77 { // M
|
|
let x = try readCGFloat(&index, end: end, separator: 44)
|
|
let y = try readCGFloat(&index, end: end, separator: 32)
|
|
|
|
//print("Move to \(x), \(y)")
|
|
context.move(to: CGPoint(x: x, y: y))
|
|
} else if c == 76 { // L
|
|
let x = try readCGFloat(&index, end: end, separator: 44)
|
|
let y = try readCGFloat(&index, end: end, separator: 32)
|
|
|
|
//print("Line to \(x), \(y)")
|
|
context.addLine(to: CGPoint(x: x, y: y))
|
|
} else if c == 67 { // C
|
|
let x1 = try readCGFloat(&index, end: end, separator: 44)
|
|
let y1 = try readCGFloat(&index, end: end, separator: 32)
|
|
let x2 = try readCGFloat(&index, end: end, separator: 44)
|
|
let y2 = try readCGFloat(&index, end: end, separator: 32)
|
|
let x = try readCGFloat(&index, end: end, separator: 44)
|
|
let y = try readCGFloat(&index, end: end, separator: 32)
|
|
context.addCurve(to: CGPoint(x: x1, y: y1), control1: CGPoint(x: x2, y: y2), control2: CGPoint(x: x, y: y))
|
|
|
|
//print("Line to \(x), \(y)")
|
|
|
|
} else if c == 90 { // Z
|
|
if index != end && index.pointee != 32 {
|
|
throw ParsingError.Generic
|
|
}
|
|
|
|
//CGContextClosePath(context)
|
|
context.fillPath()
|
|
//CGContextBeginPath(context)
|
|
//print("Close")
|
|
}
|
|
}
|
|
}
|