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Improved left/right cropping for export images

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git-svn-id: https://subtitleedit.googlecode.com/svn/trunk@940 99eadd0c-20b8-1223-b5c4-2a2b2df33de2
This commit is contained in:
niksedk 2012-01-20 22:52:21 +00:00
parent ac806aa685
commit 44b651eb5c
2 changed files with 64 additions and 1 deletions
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5
src/Forms/ExportPngXml.cs
View File

@ -474,7 +474,10 @@ namespace Nikse.SubtitleEdit.Forms
g.DrawPath(new Pen(parameter.BorderColor, parameter.BorderWidth), path);
g.FillPath(new SolidBrush(parameter.SubtitleColor), path);
g.Dispose();
return bmp;
NikseBitmap nbmp = new NikseBitmap(bmp);
nbmp.CropTransparentSides(5);
return nbmp.GetBitmap();
//return bmp;
}
private static string RemoveSubStationAlphaFormatting(string s)

60
src/Logic/NikseBitmap.cs
View File

@ -357,6 +357,66 @@ namespace Nikse.SubtitleEdit.Logic
return 0;
}
public void CropTransparentSides(int maximumCropping)
{
int leftStart = 0;
bool done = false;
for (int x = 0; x < Width; x++)
{
for (int y = 0; y < Height; y++)
{
Color c = GetPixel(x, y);
if (c.A != 0)
{
done = true;
leftStart = x;
leftStart -= maximumCropping;
if (leftStart < 0)
leftStart = 0;
break;
}
if (done)
break;
}
}
int rightEnd = Width-1;
done = false;
for (int x = Width - 1; x >= 0; x--)
{
for (int y = 0; y < Height; y++)
{
Color c = GetPixel(x, y);
if (c.A != 0)
{
done = true;
rightEnd = x;
rightEnd += maximumCropping;
if (rightEnd >= Width)
rightEnd = Width-1;
break;
}
if (done)
break;
}
}
if (leftStart < 2 && rightEnd >= Width - 3)
return;
int newWidth = rightEnd - leftStart + 1;
var newBitmapData = new byte[newWidth * Height * 4];
int index = 0;
for (int y = 0; y < Height; y++)
{
int pixelAddress = (leftStart * 4) + (y * 4 * Width);
Buffer.BlockCopy(_bitmapData, pixelAddress, newBitmapData, index, 4 * newWidth);
index += 4 * newWidth;
}
Width = newWidth;
_bitmapData = newBitmapData;
}
public void Fill(Color color)
{
byte[] buffer = new byte[4];