Some of my resulting images are slanted, some are not.
Expected Result: (529x22)
Actual Result: (529x22)
Don't mind the different image sizes, these are screenshots. They are both 529x22.
The code I am using, I just got this from an answer on a question here at SO.
// some other method
byte[] pixels = new byte[size - 16];
Array.Copy(this.data, offset, pixels, 0, pixels.Length);
this.ByteToImage(w, h, pixels);
// builds the pixels to a image
private Bitmap ByteToImage(int w, int h, byte[] pixels)
{
var bmp = new Bitmap(w, h, PixelFormat.Format16bppRgb565);
var BoundsRect = new Rectangle(0, 0, bmp.Width, bmp.Height);
BitmapData bmpData = bmp.LockBits(BoundsRect,
ImageLockMode.WriteOnly,
bmp.PixelFormat);
// bytes => not using this because it gives error
// eg. pixel.Length = 16032, bytes = 16064
int bytes = bmpData.Stride * bmp.Height;
Marshal.Copy(pixels, 0, bmpData.Scan0, pixels.Length);
bmp.UnlockBits(bmpData);
return bmp;
}
I'm confused because some works ok, not slanted. But others are slanted. What did I miss?
Update
As stated in the comments and answers, the problem is how I'm calculating stride. I'm still confused on how to do it but I tried this:
public static void RemovePadding(this Bitmap bitmap)
{
int bytesPerPixel = Image.GetPixelFormatSize(bitmap.PixelFormat) / 8;
BitmapData bitmapData = bitmap.LockBits(new Rectangle(0, 0, bitmap.Width, bitmap.Height), ImageLockMode.ReadOnly, bitmap.PixelFormat);
var pixels = new byte[bitmapData.Width * bitmapData.Height * bytesPerPixel];
for (int row = 0; row < bitmapData.Height; row++)
{
var dataBeginPointer = IntPtr.Add(bitmapData.Scan0, row * bitmapData.Stride);
Marshal.Copy(dataBeginPointer, pixels, row * bitmapData.Width * bytesPerPixel, bitmapData.Width * bytesPerPixel);
}
Marshal.Copy(pixels, 0, bitmapData.Scan0, pixels.Length);
bitmap.UnlockBits(bitmapData);
}
But the result is (more slanted):