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fix label background color drawing when transparent color used, safer…
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… dispose calls when drawing errors occur
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@barnhill
barnhill committed Apr 27, 2024
1 parent aed199d commit ad96880
Showing 1 changed file with 101 additions and 81 deletions.
182 changes: 101 additions & 81 deletions BarcodeStandard/Labels.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -85,10 +85,24 @@ public static SKImage Label_ITF14(Barcode barcode, SKBitmap img)
/// <returns>Image representation of the barcode with labels applied</returns>
public static SKImage Label_Generic(Barcode barcode, SKBitmap img)
{
using var foreBrush = new SKPaint(barcode.LabelFont)
{
ColorF = barcode.ForeColor,
IsAntialias = true,
IsLinearText = true,
IsDither = true,
IsAutohinted = true,
FilterQuality = SKFilterQuality.High,
};
using var backBrush = new SKPaint
{
ColorF = barcode.BackColor,
Style = SKPaintStyle.Fill,
IsAntialias = true,
BlendMode = SKBlendMode.SrcIn
};
try
{
using var g = new SKCanvas(img);

/*g.SmoothingMode = SmoothingMode.HighQuality;
g.InterpolationMode = InterpolationMode.HighQualityBicubic;
g.PixelOffsetMode = PixelOffsetMode.HighQuality;
Expand All @@ -97,48 +111,37 @@ public static SKImage Label_Generic(Barcode barcode, SKBitmap img)

var alignmentAdjustment = BarcodeCommon.GetAlignmentShiftAdjustment(barcode);
var text = barcode.AlternateLabel ?? barcode.RawData;

//draw datastring under the barcode image
using var foreBrush = new SKPaint(barcode.LabelFont)
{
ColorF = barcode.ForeColor,
};
foreBrush.IsAntialias = true;
foreBrush.IsLinearText = true;
foreBrush.IsDither = true;
foreBrush.IsAutohinted = true;
foreBrush.FilterQuality = SKFilterQuality.High;

//draw datastring under the barcode image
SKRect textBounds = new();
foreBrush.MeasureText(text, ref textBounds);
var labelPadding = textBounds.Height / 2f;

var labelX = img.Width / 2f - textBounds.Width / 2f;
var labelY = img.Height - textBounds.Height + labelPadding;
var backY = img.Height - textBounds.Height - labelPadding * 2f;

//color a background color box at the bottom of the barcode to hold the string of data
using var backBrush = new SKPaint

using (var g = new SKCanvas(img))
{
ColorF = barcode.BackColor,
Style = SKPaintStyle.Fill
};

g.DrawRect(SKRect.Create(0, backY, img.Width, textBounds.Height + labelPadding * 2f), backBrush);
g.DrawText(text, labelX, labelY, foreBrush);

g.Save();
g.Dispose();
foreBrush.Dispose();
backBrush.Dispose();
//color a background color box at the bottom of the barcode to hold the string of data
g.DrawRect(SKRect.Create(0, backY, img.Width, textBounds.Height + labelPadding * 2f), backBrush);
g.DrawText(text, labelX, labelY, foreBrush);

g.Save();
}
return SKImage.FromBitmap(img);
}//try
catch (Exception ex)
{
throw new Exception("ELABEL_GENERIC-1: " + ex.Message);
}//catch
finally
{
foreBrush.Dispose();
backBrush.Dispose();
}
}

/// <summary>
/// Draws Label for EAN-13 barcodes
/// </summary>
Expand All @@ -148,6 +151,22 @@ public static SKImage Label_Generic(Barcode barcode, SKBitmap img)
public static SKImage Label_EAN13(Barcode barcode, SKBitmap img)
{
if (barcode == null) throw new ArgumentNullException(nameof(barcode));
using var foreBrush = new SKPaint(barcode.LabelFont)
{
ColorF = barcode.ForeColor,
IsAntialias = true,
IsLinearText = true,
IsDither = true,
IsAutohinted = true,
FilterQuality = SKFilterQuality.High,
};
using var backBrush = new SKPaint
{
ColorF = barcode.BackColor,
Style = SKPaintStyle.Fill,
IsAntialias = true,
BlendMode = SKBlendMode.SrcIn
};
try
{
var iBarWidth = barcode.Width / barcode.EncodedValue.Length;
Expand All @@ -160,13 +179,10 @@ public static SKImage Label_EAN13(Barcode barcode, SKBitmap img)
var first = text.Substring(0, 1);
var second = text.Substring(1, 6);
var third = text.Substring(7, 6);

using var g = new SKCanvas(img);

using var foreBrush = new SKPaint(barcode.LabelFont);

SKRect textBounds = new();
foreBrush.MeasureText(text, ref textBounds);

//Default alignment for UPCA

float w1 = iBarWidth * 3; //Width of first block
Expand All @@ -177,49 +193,45 @@ public static SKImage Label_EAN13(Barcode barcode, SKBitmap img)
var s2 = s1 + w1; //Start position of block 2
var s3 = s2 + w2 + iBarWidth * 5; //Start position of block 3
var s4 = s3 + w3;

SKRect textBounds1 = new();
SKRect textBounds2 = new();
SKRect textBounds3 = new();
SKRect textBounds4 = new();

foreBrush.MeasureText(first, ref textBounds1);
foreBrush.MeasureText(second, ref textBounds2);
foreBrush.MeasureText(third, ref textBounds3);

//Draw the background rectangles for each block
using (var backBrush = new SKPaint())
using (var g = new SKCanvas(img))
{
backBrush.ColorF = barcode.BackColor;
backBrush.IsAntialias = true;

//Draw the background rectangles for each block
g.DrawRect(new SKRect(s1, img.Height - textBounds1.Height - textBounds1.Height / 4f, s1 + w1, img.Height), backBrush); // first guard bar cover
g.DrawRect(new SKRect(s3, img.Height - textBounds3.Height * 2f, s3 + w3, img.Height), backBrush); // middle bar cover

g.DrawRect(new SKRect(s2 + w2, img.Height - textBounds4.Height - textBounds4.Height / 4f, s3, img.Height), backBrush);
g.DrawRect(new SKRect(s2, img.Height - textBounds2.Height * 2f, s2 + w2, img.Height), backBrush);
}

foreBrush.ColorF = barcode.ForeColor;
foreBrush.IsAntialias = true;
foreBrush.IsDither = true;
foreBrush.IsLinearText = true;
foreBrush.IsAutohinted = true;
foreBrush.FilterQuality = SKFilterQuality.High;

g.DrawText(first, s1 + (w1 / 2f - textBounds1.Width / 2f), img.Height, foreBrush);
g.DrawText(second, s2 + (w2 / 2f - textBounds2.Width / 2f), img.Height + textBounds2.MidY, foreBrush);
g.DrawText(third, s3 + (w3 / 2f - textBounds3.Width / 2f), img.Height + textBounds3.MidY, foreBrush);
//Draw text
g.DrawText(first, s1 + (w1 / 2f - textBounds1.Width / 2f), img.Height, foreBrush);
g.DrawText(second, s2 + (w2 / 2f - textBounds2.Width / 2f), img.Height + textBounds2.MidY, foreBrush);
g.DrawText(third, s3 + (w3 / 2f - textBounds3.Width / 2f), img.Height + textBounds3.MidY, foreBrush);

g.Save();
g.Dispose();
foreBrush.Dispose();
g.Save();
}

return SKImage.FromBitmap(img);
}//try
catch (Exception ex)
{
throw new Exception("ELABEL_EAN13-1: " + ex.Message);
}//catch
finally
{
foreBrush.Dispose();
backBrush.Dispose();
}
}//Label_EAN13

/// <summary>
Expand All @@ -231,6 +243,23 @@ public static SKImage Label_EAN13(Barcode barcode, SKBitmap img)
public static SKImage Label_UPCA(Barcode barcode, SKBitmap img)
{
if (barcode == null) throw new ArgumentNullException(nameof(barcode));
using var foreBrush = new SKPaint(barcode.LabelFont)
{
ColorF = barcode.ForeColor,
IsAntialias = true,
IsLinearText = true,
IsDither = true,
IsAutohinted = true,
FilterQuality = SKFilterQuality.High,
};
using var backBrush = new SKPaint
{
ColorF = barcode.BackColor,
Style = SKPaintStyle.Fill,
IsAntialias = true,
BlendMode = SKBlendMode.SrcIn
};

try
{
var iBarWidth = barcode.Width / barcode.EncodedValue.Length;
Expand All @@ -244,13 +273,10 @@ public static SKImage Label_UPCA(Barcode barcode, SKBitmap img)
var second = text.Substring(1, 5);
var third = text.Substring(6, 5);
var fourth = text.Substring(11);

using var g = new SKCanvas(img);

using var foreBrush = new SKPaint(barcode.LabelFont);

SKRect textBounds = new();
foreBrush.MeasureText(text, ref textBounds);

//Default alignment for UPCA

float w1 = iBarWidth * 3; //Width of first block
Expand All @@ -262,52 +288,46 @@ public static SKImage Label_UPCA(Barcode barcode, SKBitmap img)
var s2 = s1 + w1; //Start position of block 2
var s3 = s2 + w2 + iBarWidth * 5; //Start position of block 3
var s4 = s3 + w3;

SKRect textBounds1 = new();
SKRect textBounds2 = new();
SKRect textBounds3 = new();
SKRect textBounds4 = new();

foreBrush.MeasureText(first, ref textBounds1);
foreBrush.MeasureText(second, ref textBounds2);
foreBrush.MeasureText(third, ref textBounds3);
foreBrush.MeasureText(fourth, ref textBounds4);

//Draw the background rectangles for each block
using (var backBrush = new SKPaint())
using (var g = new SKCanvas(img))
{
backBrush.ColorF = barcode.BackColor;
backBrush.IsAntialias = true;

g.DrawRect(new SKRect(s1, img.Height - textBounds1.Height - textBounds1.Height / 4f, s1 + w1, img.Height), backBrush); // first guard bar cover
g.DrawRect(new SKRect(s4, img.Height - textBounds4.Height - textBounds4.Height / 4f, s4 + w4, img.Height), backBrush); // end guard bar cover
g.DrawRect(new SKRect(s3, img.Height - textBounds3.Height * 2f, s3 + w3, img.Height), backBrush); // middle bar cover

g.DrawRect(new SKRect(s2 + w2, img.Height - textBounds4.Height - textBounds4.Height / 4f, s3, img.Height), backBrush);
g.DrawRect(new SKRect(s2, img.Height - textBounds2.Height * 2f, s2 + w2, img.Height), backBrush);
}

foreBrush.ColorF = barcode.ForeColor;
foreBrush.IsAntialias = true;
foreBrush.IsDither = true;
foreBrush.IsLinearText = true;
foreBrush.IsAutohinted = true;
foreBrush.FilterQuality = SKFilterQuality.High;
g.DrawText(first, s1 + (w1 / 2f - textBounds1.Width / 2f), img.Height, foreBrush);
g.DrawText(second, s2 + (w2 / 2f - textBounds2.Width / 2f), img.Height + textBounds2.MidY, foreBrush);
g.DrawText(third, s3 + (w3 / 2f - textBounds3.Width / 2f), img.Height + textBounds3.MidY, foreBrush);
g.DrawText(fourth, s4 + (w4 / 2f - textBounds4.Width / 2f), img.Height, foreBrush);

g.DrawText(first, s1 + (w1 / 2f - textBounds1.Width / 2f), img.Height, foreBrush);
g.DrawText(second, s2 + (w2 / 2f - textBounds2.Width / 2f), img.Height + textBounds2.MidY, foreBrush);
g.DrawText(third, s3 + (w3 / 2f - textBounds3.Width / 2f), img.Height + textBounds3.MidY, foreBrush);
g.DrawText(fourth, s4 + (w4 / 2f - textBounds4.Width / 2f), img.Height, foreBrush);
g.Save();
}

g.Save();
g.Dispose();
foreBrush.Dispose();
return SKImage.FromBitmap(img);
}//try
catch (Exception ex)
{
throw new Exception("ELABEL_UPCA-1: " + ex.Message);
}//catch
finally
{
foreBrush.Dispose();
backBrush.Dispose();
}
}//Label_UPCA

private static int GetFontSize(Barcode barcode, int wid, int hgt, string lbl)
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