public static int CalculateStride(int width, CpuBlit.Imaging.PixelFormat format, out int bitDepth, out int bytesPerPixel)
{
//stride calcuation helper
switch (format)
{
case CpuBlit.Imaging.PixelFormat.ARGB32:
{
bitDepth = 32;
bytesPerPixel = (bitDepth + 7) / 8;
return width * (32 / 8);
}
case CpuBlit.Imaging.PixelFormat.GrayScale8:
{
bitDepth = 8; //bit per pixel
bytesPerPixel = (bitDepth + 7) / 8;
return 4 * ((width * bytesPerPixel + 3) / 4);
}
case CpuBlit.Imaging.PixelFormat.RGB24:
{
bitDepth = 24; //bit per pixel
bytesPerPixel = (bitDepth + 7) / 8;
return 4 * ((width * bytesPerPixel + 3) / 4);
}
default:
throw new NotSupportedException();
}
}
public ActualBitmap(int width, int height, int[] orgBuffer)
{
//width and height must >0
this.width = width;
this.height = height;
int bytesPerPixel;
this.stride = CalculateStride(width,
this.pixelFormat = CpuBlit.Imaging.PixelFormat.ARGB32, //***
out bitDepth,
out bytesPerPixel);
//alloc mem
this.pixelBuffer = orgBuffer;
}
public MemBitmap(int width, int height, IntPtr externalNativeInt32Ptr)
{
//width and height must >0
_width = width;
_height = height;
_strideBytes = CalculateStride(width,
_pixelFormat = CpuBlit.Imaging.PixelFormat.ARGB32, //***
out _bitDepth,
out int bytesPerPixel);
_pixelBufferInBytes = width * height * 4;
_pixelBufferFromExternalSrc = true; //*** we receive ptr from external ***
_pixelBuffer = externalNativeInt32Ptr;
#if DEBUG
dbugMemBitmapMonitor.dbugRegisterMemBitmap(this, width + "x" + height + ": " + DateTime.Now.ToString("u"));
#endif
}
public static int CalculateStride(int width, CpuBlit.Imaging.PixelFormat format)
{
int bitDepth, bytesPerPixel;
return CalculateStride(width, format, out bitDepth, out bytesPerPixel);
}
