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Joined: 5/10/2006(UTC)
Posts: 32
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I'm having to process an external data file that contains image data, but not in any normal format, and construct the image this is in it. These images are often 9600x101406 24bbp or bigger. I create a new Aurigma bitmap instance with those dimensions, and then use the Scan0 to directly access the pixels to assign the colors from the external file. When I get to pixel location row 74566, column 0, I get an access violation. Which is a hair more than 2GB. (74566 * 9600 * 3) = 2,147,500,800 Any ideas on what to do? .net 4.6.2 Aurigma Graphics Mill, 9.2.23.0 x64 Code:
//must use lingpad 'any cpu' or create a console app set to run as 64bit.
void Main()
{
int height = 101406;
int width = 9600;
var bmp = new Bitmap(width, height, PixelFormat.Format24bppRgb);
unsafe
{
System.Drawing.Color color = System.Drawing.Color.Beige;
for(int y = 0; y < height; y++)
{
if (y % 50 == 0) Console.Write(".");
if (y % 1000 == 0) Console.WriteLine(" " + y);
byte* rowStartPosition = (byte*)bmp.Scan0.ToPointer() + (y * bmp.Stride);
for(int x = 0; x < width; x++)
{
try
{
byte* pixelPostion = rowStartPosition + (x * 3);
// do real work here
//var color = CMYKToRGB(planes[0][x], planes[1][x], planes[2][x], planes[3][x]);
//will crash here when we pass 2GB
*(pixelPostion + 0) = (byte)color.B;
*(pixelPostion + 1) = (byte)color.G;
*(pixelPostion + 2) = (byte)color.R;
}
catch(Exception ex) //since it is an Access violation, we cannot not catch it without extra settings
{
Console.WriteLine($"Error updating pixel color. x,y {x},{y}. msg: {ex.Message}");
throw;
}
}
}
}
}
app.config - to allow memory allocation greater than 2GB Code:
<configuration>
<runtime>
<gcAllowVeryLargeObjects enabled="true"></gcAllowVeryLargeObjects>
</runtime>
</configuration>
Upon further testing with this simple example, I dont think the Memory, at least not all of it, is getting allocated during the new call. The new call does take a few seconds. Code:
int height = 101406;
int width = 9600;
var bmp = new Bitmap(width, height, PixelFormat.Format24bppRgb);
bmp.Fill(Color.FromGdiPlusColor(System.Drawing.Color.BlueViolet));
bmp.Save(@"C:\temp\test.jpg");
I get an ArgumentOutOfRangeException during the Save call, the callstack looks like its running the pipeline at the time of save. Code:
at Aurigma.GraphicsMill.GMException.ThrowManagedException(IntPtr unmanagedException)
at Aurigma.GraphicsMill.PipelineElement.RunPipeline()
at Aurigma.GraphicsMill.Pipeline.Run()
at Aurigma.GraphicsMill.Bitmap.SaveToWriter(ImageWriter writer)
at Aurigma.GraphicsMill.Bitmap.Save(String fileName)
at UserQuery
at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Threading.ThreadHelper.ThreadStart()
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