public void Draw(SkiaSharp.SKCanvas canvas) { var info = this.info; var viewBounds = Bounds; var scale = (float)UIKit.UIScreen.MainScreen.Scale; using (var image = new SkiaSharp.SKBitmap(info, info.RowBytes)) { using (var pixels = image.PeekPixels()) using (var colorSpace = CGColorSpace.CreateDeviceRGB()) using (var ctx = new CGBitmapContext(pixels.GetPixels(), info.Width, info.Height, 8, info.RowBytes, colorSpace, CGBitmapFlags.PremultipliedLast | CGBitmapFlags.ByteOrder32Big)) { ctx.ClearRect(viewBounds); ctx.TranslateCTM(0, info.Height); ctx.ScaleCTM(scale, -scale); Layer.RenderInContext(ctx); } canvas.DrawBitmap(image, SkiaSharp.SKPoint.Empty); } }
/// <summary> /// 生成二维码(320*320) /// </summary> /// <param name="text">文本内容</param> /// <param name="format">保存格式</param> /// <param name="logoImgae">Logo图片(缩放到真实二维码区域尺寸的1/6)</param> /// <param name="keepWhiteBorderPixelVal">白边处理(负值表示不做处理,最大值不超过真实二维码区域的1/10)</param> /// <returns></returns> public static byte[] QRCoder(string text, SkiaSharp.SKEncodedImageFormat format, byte[] logoImgae = null, int keepWhiteBorderPixelVal = -1) { byte[] reval = null; int width = 320; int height = 320; var qRCodeWriter = new ZXing.QrCode.QRCodeWriter(); var hints = new Dictionary <ZXing.EncodeHintType, object>(); hints.Add(ZXing.EncodeHintType.CHARACTER_SET, "utf-8"); hints.Add(ZXing.EncodeHintType.QR_VERSION, 8); hints.Add(ZXing.EncodeHintType.ERROR_CORRECTION, ZXing.QrCode.Internal.ErrorCorrectionLevel.Q); var bitMatrix = qRCodeWriter.encode(text, ZXing.BarcodeFormat.QR_CODE, width, height, hints); var w = bitMatrix.Width; var h = bitMatrix.Height; var sKBitmap = new SkiaSharp.SKBitmap(w, h); int blackStartPointX = 0; int blackStartPointY = 0; int blackEndPointX = w; int blackEndPointY = h; #region --绘制二维码(同时获取真实的二维码区域起绘点和结束点的坐标)-- var sKCanvas = new SkiaSharp.SKCanvas(sKBitmap); var sKColorBlack = SkiaSharp.SKColor.Parse("000000"); var sKColorWihte = SkiaSharp.SKColor.Parse("ffffff"); sKCanvas.Clear(sKColorWihte); bool blackStartPointIsNotWriteDown = true; for (var y = 0; y < h; y++) { for (var x = 0; x < w; x++) { var flag = bitMatrix[x, y]; if (flag) { if (blackStartPointIsNotWriteDown) { blackStartPointX = x; blackStartPointY = y; blackStartPointIsNotWriteDown = false; } blackEndPointX = x; blackEndPointY = y; sKCanvas.DrawPoint(x, y, sKColorBlack); } else { //sKCanvas.DrawPoint(x, y, sKColorWihte);//不用绘制(背景是白色的) } } } sKCanvas.Dispose(); #endregion int qrcodeRealWidth = blackEndPointX - blackStartPointX; int qrcodeRealHeight = blackEndPointY - blackStartPointY; #region -- 处理白边 -- if (keepWhiteBorderPixelVal > -1)//指定了边框宽度 { var borderMaxWidth = (int)Math.Floor((double)qrcodeRealWidth / 10); if (keepWhiteBorderPixelVal > borderMaxWidth) { keepWhiteBorderPixelVal = borderMaxWidth; } var nQrcodeRealWidth = width - keepWhiteBorderPixelVal - keepWhiteBorderPixelVal; var nQrcodeRealHeight = height - keepWhiteBorderPixelVal - keepWhiteBorderPixelVal; var sKBitmap2 = new SkiaSharp.SKBitmap(width, height); var sKCanvas2 = new SkiaSharp.SKCanvas(sKBitmap2); sKCanvas2.Clear(sKColorWihte); //二维码绘制到临时画布上时无需抗锯齿等处理(避免文件增大) sKCanvas2.DrawBitmap( sKBitmap, new SkiaSharp.SKRect { Location = new SkiaSharp.SKPoint { X = blackStartPointX, Y = blackStartPointY }, Size = new SkiaSharp.SKSize { Height = qrcodeRealHeight, Width = qrcodeRealWidth } }, new SkiaSharp.SKRect { Location = new SkiaSharp.SKPoint { X = keepWhiteBorderPixelVal, Y = keepWhiteBorderPixelVal }, Size = new SkiaSharp.SKSize { Width = nQrcodeRealWidth, Height = nQrcodeRealHeight } }); blackStartPointX = keepWhiteBorderPixelVal; blackStartPointY = keepWhiteBorderPixelVal; qrcodeRealWidth = nQrcodeRealWidth; qrcodeRealHeight = nQrcodeRealHeight; sKCanvas2.Dispose(); sKBitmap.Dispose(); sKBitmap = sKBitmap2; } #endregion #region -- 绘制LOGO -- if (logoImgae != null && logoImgae.Length > 0) { SkiaSharp.SKBitmap sKBitmapLogo = SkiaSharp.SKBitmap.Decode(logoImgae); if (!sKBitmapLogo.IsEmpty) { var sKPaint2 = new SkiaSharp.SKPaint { FilterQuality = SkiaSharp.SKFilterQuality.None, IsAntialias = true }; var logoTargetMaxWidth = (int)Math.Floor((double)qrcodeRealWidth / 6); var logoTargetMaxHeight = (int)Math.Floor((double)qrcodeRealHeight / 6); var qrcodeCenterX = (int)Math.Floor((double)qrcodeRealWidth / 2); var qrcodeCenterY = (int)Math.Floor((double)qrcodeRealHeight / 2); var logoResultWidth = sKBitmapLogo.Width; var logoResultHeight = sKBitmapLogo.Height; if (logoResultWidth > logoTargetMaxWidth) { var r = (double)logoTargetMaxWidth / logoResultWidth; logoResultWidth = logoTargetMaxWidth; logoResultHeight = (int)Math.Floor(logoResultHeight * r); } if (logoResultHeight > logoTargetMaxHeight) { var r = (double)logoTargetMaxHeight / logoResultHeight; logoResultHeight = logoTargetMaxHeight; logoResultWidth = (int)Math.Floor(logoResultWidth * r); } var pointX = qrcodeCenterX - (int)Math.Floor((double)logoResultWidth / 2) + blackStartPointX; var pointY = qrcodeCenterY - (int)Math.Floor((double)logoResultHeight / 2) + blackStartPointY; var sKCanvas3 = new SkiaSharp.SKCanvas(sKBitmap); var sKPaint = new SkiaSharp.SKPaint { FilterQuality = SkiaSharp.SKFilterQuality.Medium, IsAntialias = true }; sKCanvas3.DrawBitmap( sKBitmapLogo, new SkiaSharp.SKRect { Location = new SkiaSharp.SKPoint { X = 0, Y = 0 }, Size = new SkiaSharp.SKSize { Height = sKBitmapLogo.Height, Width = sKBitmapLogo.Width } }, new SkiaSharp.SKRect { Location = new SkiaSharp.SKPoint { X = pointX, Y = pointY }, Size = new SkiaSharp.SKSize { Height = logoResultHeight, Width = logoResultWidth } }, sKPaint); sKCanvas3.Dispose(); sKPaint.Dispose(); sKBitmapLogo.Dispose(); } else { sKBitmapLogo.Dispose(); } } #endregion SkiaSharp.SKImage sKImage = SkiaSharp.SKImage.FromBitmap(sKBitmap); sKBitmap.Dispose(); var data = sKImage.Encode(format, 75); sKImage.Dispose(); reval = data.ToArray(); data.Dispose(); return(reval); }
public static byte[] ImageScalingToRange(string path, int maxWidth, int maxHeight, int quality) { byte[] bytes = null; if (!System.IO.File.Exists(path)) { return(bytes); } var fileStream = new System.IO.FileStream(path, System.IO.FileMode.Open, System.IO.FileAccess.Read, System.IO.FileShare.Read); //fileInfo.OpenRead(); if (fileStream.Length > maxLength) { fileStream.Dispose(); return(bytes); } var sKManagedStream = new SkiaSharp.SKManagedStream(fileStream, true); var sKBitmap = SkiaSharp.SKBitmap.Decode(sKManagedStream); sKManagedStream.Dispose(); if (sKBitmap.IsEmpty) { return(bytes); } if (maxWidth < 1) { maxWidth = 1; } if (maxHeight < 1) { maxHeight = 1; } if (quality < 1) { quality = 1; } if (quality > 100) { quality = 100; } int oW = sKBitmap.Width; int oH = sKBitmap.Height; int nW = oW; int nH = oH; if (nW < maxWidth && nH < maxHeight)//放大 { if (nW < maxWidth) { var r = (double)maxWidth / (double)nW; nW = maxWidth; nH = (int)Math.Floor((double)nH * r); } if (nH < maxHeight) { var r = (double)maxHeight / (double)nH; nH = maxHeight; nW = (int)Math.Floor((double)nW * r); } } //限制超出(缩小) if (nW > maxWidth) { var r = (double)maxWidth / (double)nW; nW = maxWidth; nH = (int)Math.Floor((double)nH * r); } if (nH > maxHeight) { var r = (double)maxHeight / (double)nH; nH = maxHeight; nW = (int)Math.Floor((double)nW * r); } var sKBitmap2 = new SkiaSharp.SKBitmap(nW, nH); var sKCanvas = new SkiaSharp.SKCanvas(sKBitmap2); var sKPaint = new SkiaSharp.SKPaint { FilterQuality = SkiaSharp.SKFilterQuality.Medium, IsAntialias = true }; sKCanvas.DrawBitmap( sKBitmap, new SkiaSharp.SKRect { Location = new SkiaSharp.SKPoint { X = 0, Y = 0 }, Size = new SkiaSharp.SKSize { Height = oH, Width = oW } }, new SkiaSharp.SKRect { Location = new SkiaSharp.SKPoint { X = 0, Y = 0 }, Size = new SkiaSharp.SKSize { Height = nH, Width = nW } }, sKPaint); sKCanvas.Dispose(); var sKImage2 = SkiaSharp.SKImage.FromBitmap(sKBitmap2); sKBitmap2.Dispose(); var data = sKImage2.Encode(GetImageFormatByPath(path), quality); sKImage2.Dispose(); bytes = data.ToArray(); data.Dispose(); return(bytes); }
public static byte[] ImageScalingByOversized(string path, int maxWidth, int maxHeight, int quality) { byte[] bytes = null; if (!System.IO.File.Exists(path)) { return(bytes); } var fileStream = new System.IO.FileStream(path, System.IO.FileMode.Open, System.IO.FileAccess.Read, System.IO.FileShare.Read); if (fileStream.Length > maxLength) { fileStream.Dispose(); return(bytes); } var sKManagedStream = new SkiaSharp.SKManagedStream(fileStream, true); var sKBitmap = SkiaSharp.SKBitmap.Decode(sKManagedStream); sKManagedStream.Dispose(); if (sKBitmap.IsEmpty) { return(bytes); } if (maxWidth < 1) { maxWidth = 1; } if (maxHeight < 1) { maxHeight = 1; } if (quality < 1) { quality = 1; } if (quality > 100) { quality = 100; } int oW = sKBitmap.Width; int oH = sKBitmap.Height; int nW = oW; int nH = oH; if (oW > maxWidth || oH > maxHeight) { nW = maxWidth; nH = maxHeight; double ratio = 1; if (nW > 0 && nH > 0) { ratio = (double)nW / oW; nH = Convert.ToInt32(oH * ratio); if (maxHeight < nH) { ratio = (double)maxHeight / nH; nW = Convert.ToInt32(nW * ratio); nH = maxHeight; } } if (nW < 1 && nH < 1) { nW = oW; nH = oH; } if (nW < 1) { ratio = (double)nH / oH; nW = Convert.ToInt32(oW * ratio); } if (nH < 1) { ratio = (double)nW / oW; nH = Convert.ToInt32(oH * ratio); } var sKBitmap2 = new SkiaSharp.SKBitmap(nW, nH); var sKCanvas = new SkiaSharp.SKCanvas(sKBitmap2); var sKPaint = new SkiaSharp.SKPaint { FilterQuality = SkiaSharp.SKFilterQuality.Medium, IsAntialias = true }; sKCanvas.DrawBitmap( sKBitmap, new SkiaSharp.SKRect { Location = new SkiaSharp.SKPoint { X = 0, Y = 0 }, Size = new SkiaSharp.SKSize { Height = oH, Width = oW } }, new SkiaSharp.SKRect { Location = new SkiaSharp.SKPoint { X = 0, Y = 0 }, Size = new SkiaSharp.SKSize { Height = nH, Width = nW } }, sKPaint); sKCanvas.Dispose(); sKBitmap.Dispose(); sKBitmap = sKBitmap2; } var sKImage = SkiaSharp.SKImage.FromBitmap(sKBitmap); sKBitmap.Dispose(); var data = sKImage.Encode(GetImageFormatByPath(path), quality); sKImage.Dispose(); bytes = data.ToArray(); data.Dispose(); return(bytes); }
public static byte[] ImageMaxCutByCenter(string path, int saveWidth, int saveHeight, int quality) { byte[] bytes = null; if (!System.IO.File.Exists(path)) { return(bytes); } var fileStream = new System.IO.FileStream(path, System.IO.FileMode.Open, System.IO.FileAccess.Read, System.IO.FileShare.Read); //fileInfo.OpenRead(); if (fileStream.Length > maxLength) { fileStream.Dispose(); return(bytes); } var sKManagedStream = new SkiaSharp.SKManagedStream(fileStream, true); var sKBitmap = SkiaSharp.SKBitmap.Decode(sKManagedStream); sKManagedStream.Dispose(); if (sKBitmap.IsEmpty) { return(bytes); } if (saveWidth < 1) { saveWidth = 1; } if (saveHeight < 1) { saveHeight = 1; } if (quality < 1) { quality = 1; } if (quality > 100) { quality = 100; } int oW = sKBitmap.Width; int oH = sKBitmap.Height; int cutW = saveWidth; int cutH = saveHeight; double ratio = 1; if (cutW > oW) { ratio = (double)oW / (double)cutW; cutH = Convert.ToInt32((double)cutH * ratio); cutW = oW; if (cutH > oH) { ratio = (double)oH / (double)cutH; cutW = Convert.ToInt32((double)cutW * ratio); cutH = oH; } } else if (cutW < oW) { ratio = (double)oW / (double)cutW; cutH = Convert.ToInt32(Convert.ToDouble(cutH) * ratio); cutW = oW; if (cutH > oH) { ratio = (double)oH / (double)cutH; cutW = Convert.ToInt32((double)cutW * ratio); cutH = oH; } } else { if (cutH > oH) { ratio = (double)oH / (double)cutH; cutW = Convert.ToInt32((double)cutW * ratio); cutH = oH; } } int startX = oW > cutW ? (oW / 2 - cutW / 2) : (cutW / 2 - oW / 2); int startY = oH > cutH ? (oH / 2 - cutH / 2) : (cutH / 2 - oH / 2); var sKBitmap2 = new SkiaSharp.SKBitmap(saveWidth, saveHeight); var sKCanvas = new SkiaSharp.SKCanvas(sKBitmap2); var sKPaint = new SkiaSharp.SKPaint { FilterQuality = SkiaSharp.SKFilterQuality.Medium, IsAntialias = true }; sKCanvas.DrawBitmap( sKBitmap, new SkiaSharp.SKRect { Location = new SkiaSharp.SKPoint { X = startX, Y = startY }, Size = new SkiaSharp.SKSize { Height = cutH, Width = cutW } }, new SkiaSharp.SKRect { Location = new SkiaSharp.SKPoint { X = 0, Y = 0 }, Size = new SkiaSharp.SKSize { Height = saveHeight, Width = saveWidth } }, sKPaint); sKCanvas.Dispose(); var sKImage2 = SkiaSharp.SKImage.FromBitmap(sKBitmap2); sKBitmap2.Dispose(); var data = sKImage2.Encode(GetImageFormatByPath(path), quality); sKImage2.Dispose(); bytes = data.ToArray(); data.Dispose(); return(bytes); }