/// <summary>
/// Function to write an array of value types to a stream using the GorgonBinaryWriter and reading it back again using the GorgonBinaryReader.
/// </summary>
/// <param name="stream">The stream that will receive the data.</param>
private static void WriteArrayValues(MemoryStream stream)
{
stream.Position = 0;
var writer = new GorgonBinaryWriter(stream, true);
var reader = new GorgonBinaryReader(stream, true);
try
{
var expected = new SomeTestData[3];
for (int i = 1; i < 4; ++i)
{
expected[i - 1] = new SomeTestData
{
Value1 = i,
Value2 = System.Math.PI * i,
Value3 = (short)(i & 2)
};
}
Console.ForegroundColor = ConsoleColor.Cyan;
Console.WriteLine("Writing/Reading an array of value types to a memory stream.");
Console.ForegroundColor = ConsoleColor.White;
writer.WriteRange(expected);
stream.Position = 0;
var actual = new SomeTestData[4];
reader.ReadRange(actual, 1);
for (int i = 1; i < 4; ++i)
{
Console.ForegroundColor = ConsoleColor.Yellow;
Console.Write($"[{i - 1}] ");
Console.ForegroundColor = ConsoleColor.White;
Console.WriteLine($"int32 Value1 = {expected[i - 1].Value1}: {actual[i].Value1 == expected[i - 1].Value1}");
Console.ForegroundColor = ConsoleColor.Yellow;
Console.Write($"[{i - 1}] ");
Console.ForegroundColor = ConsoleColor.White;
Console.WriteLine($"double Value2 = {expected[i - 1].Value2:0.00000}: {actual[i].Value2.EqualsEpsilon(expected[i - 1].Value2)}");
Console.ForegroundColor = ConsoleColor.Yellow;
Console.Write($"[{i - 1}] ");
Console.ForegroundColor = ConsoleColor.White;
Console.WriteLine($"int16 Value3 = {expected[i - 1].Value3}: {actual[i].Value3 == expected[i - 1].Value3}");
}
stream.Position = 0;
}
finally
{
writer.Dispose();
reader.Dispose();
}
}
/// <summary>
/// Function to perform the copying of image data into the buffer.
/// </summary>
/// <param name="reader">A reader used to read the data from the source stream.</param>
/// <param name="image">Image data.</param>
/// <param name="conversionFlags">Flags used to convert the image.</param>
private void CopyImageData(GorgonBinaryReader reader, IGorgonImage image, TGAConversionFlags conversionFlags)
{
// TGA only supports 1 array level, and 1 mip level, so we only need to get the first buffer.
IGorgonImageBuffer buffer = image.Buffers[0];
// Determine how large a row is, in bytes.
var formatInfo = new GorgonFormatInfo(image.Format);
GorgonPitchLayout srcPitch = (conversionFlags & TGAConversionFlags.Expand) == TGAConversionFlags.Expand
? new GorgonPitchLayout(image.Width * 3, image.Width * 3 * image.Height)
: formatInfo.GetPitchForFormat(image.Width, image.Height);
unsafe
{
// Otherwise, allocate a buffer for conversion.
byte *destPtr = (byte *)buffer.Data;
// Adjust destination for inverted axes.
if ((conversionFlags & TGAConversionFlags.InvertX) == TGAConversionFlags.InvertX)
{
destPtr += buffer.PitchInformation.RowPitch - formatInfo.SizeInBytes;
}
if ((conversionFlags & TGAConversionFlags.InvertY) != TGAConversionFlags.InvertY)
{
destPtr += (image.Height - 1) * buffer.PitchInformation.RowPitch;
}
// Used to counter the number of lines to force as opaque.
int opaqueLineCount = 0;
// The buffer used to hold an uncompressed scanline.
GorgonNativeBuffer <byte> lineBuffer = null;
try
{
for (int y = 0; y < image.Height; y++)
{
// Indicates that the scanline has an alpha of 0 for the entire run.
bool lineHasZeroAlpha;
if ((conversionFlags & TGAConversionFlags.RLE) == TGAConversionFlags.RLE)
{
lineHasZeroAlpha = ReadCompressed(reader, image.Width, destPtr, image.Format, conversionFlags);
}
else
{
// Read the current scanline into memory.
if (lineBuffer == null)
{
lineBuffer = new GorgonNativeBuffer <byte>(srcPitch.RowPitch);
}
reader.ReadRange(lineBuffer, count: srcPitch.RowPitch);
lineHasZeroAlpha = ReadUncompressed((byte *)lineBuffer, srcPitch.RowPitch, destPtr, image.Format, conversionFlags);
}
if ((lineHasZeroAlpha) && ((conversionFlags & TGAConversionFlags.SetOpaqueAlpha) == TGAConversionFlags.SetOpaqueAlpha))
{
opaqueLineCount++;
}
// The components of the pixel data in a TGA file need swizzling for 32 bit.
if (formatInfo.BitDepth == 32)
{
ImageUtilities.SwizzleScanline(destPtr,
buffer.PitchInformation.RowPitch,
destPtr,
buffer.PitchInformation.RowPitch,
image.Format,
ImageBitFlags.None);
}
if ((conversionFlags & TGAConversionFlags.InvertY) != TGAConversionFlags.InvertY)
{
destPtr -= buffer.PitchInformation.RowPitch;
}
else
{
destPtr += buffer.PitchInformation.RowPitch;
}
}
}
finally
{
lineBuffer?.Dispose();
}
if (opaqueLineCount != image.Height)
{
return;
}
// Set the alpha to opaque if we don't have any alpha values (i.e. alpha = 0 for all pixels).
destPtr = (byte *)buffer.Data;
for (int y = 0; y < image.Height; y++)
{
ImageUtilities.CopyScanline(destPtr,
buffer.PitchInformation.RowPitch,
destPtr,
buffer.PitchInformation.RowPitch,
image.Format,
ImageBitFlags.OpaqueAlpha);
destPtr += buffer.PitchInformation.RowPitch;
}
}
}
