public YUVToRGBLookup(PixelFormat format, LuminanceScale scale)
{
_format = format;
_scale = scale;
var r_2_pix_alloc = 0 * 768;
var g_2_pix_alloc = 1 * 768;
var b_2_pix_alloc = 2 * 768;
if (scale == LuminanceScale.ScaleFull)
{
// Set up entries 0-255 in rgb-to-pixel value tables.
for (int i = 0; i < 256; i++)
{
_rgbToPix[r_2_pix_alloc + i + 256] = ColorHelper.RGBToColor((byte)i, 0, 0);
_rgbToPix[g_2_pix_alloc + i + 256] = ColorHelper.RGBToColor(0, (byte)i, 0);
_rgbToPix[b_2_pix_alloc + i + 256] = ColorHelper.RGBToColor(0, 0, (byte)i);
}
// Spread out the values we have to the rest of the array so that we do
// not need to check for overflow.
for (int i = 0; i < 256; i++)
{
_rgbToPix[r_2_pix_alloc + i] = _rgbToPix[r_2_pix_alloc + 256];
_rgbToPix[r_2_pix_alloc + i + 512] = _rgbToPix[r_2_pix_alloc + 511];
_rgbToPix[g_2_pix_alloc + i] = _rgbToPix[g_2_pix_alloc + 256];
_rgbToPix[g_2_pix_alloc + i + 512] = _rgbToPix[g_2_pix_alloc + 511];
_rgbToPix[b_2_pix_alloc + i] = _rgbToPix[b_2_pix_alloc + 256];
_rgbToPix[b_2_pix_alloc + i + 512] = _rgbToPix[b_2_pix_alloc + 511];
}
}
else
{
// Set up entries 16-235 in rgb-to-pixel value tables
for (int i = 16; i < 236; i++)
{
byte scaledValue = (byte)((i - 16) * 255 / 219);
_rgbToPix[r_2_pix_alloc + i + 256] = ColorHelper.RGBToColor(scaledValue, 0, 0);
_rgbToPix[g_2_pix_alloc + i + 256] = ColorHelper.RGBToColor(0, scaledValue, 0);
_rgbToPix[b_2_pix_alloc + i + 256] = ColorHelper.RGBToColor(0, 0, scaledValue);
}
// Spread out the values we have to the rest of the array so that we do
// not need to check for overflow. We have to do it here in two steps.
for (int i = 0; i < 256 + 16; i++)
{
_rgbToPix[r_2_pix_alloc + i] = _rgbToPix[r_2_pix_alloc + 256 + 16];
_rgbToPix[g_2_pix_alloc + i] = _rgbToPix[g_2_pix_alloc + 256 + 16];
_rgbToPix[b_2_pix_alloc + i] = _rgbToPix[b_2_pix_alloc + 256 + 16];
}
for (int i = 256 + 236; i < 768; i++)
{
_rgbToPix[r_2_pix_alloc + i] = _rgbToPix[r_2_pix_alloc + 256 + 236 - 1];
_rgbToPix[g_2_pix_alloc + i] = _rgbToPix[g_2_pix_alloc + 256 + 236 - 1];
_rgbToPix[b_2_pix_alloc + i] = _rgbToPix[b_2_pix_alloc + 256 + 236 - 1];
}
}
}
public YUVToRGBLookup(PixelFormat format, LuminanceScale scale)
{
_format = format;
_scale = scale;
var r_2_pix_alloc = 0 * 768;
var g_2_pix_alloc = 1 * 768;
var b_2_pix_alloc = 2 * 768;
if (scale == LuminanceScale.ScaleFull)
{
// Set up entries 0-255 in rgb-to-pixel value tables.
for (int i = 0; i < 256; i++)
{
_rgbToPix[r_2_pix_alloc + i + 256] = ColorHelper.RGBToColor((byte)i, 0, 0);
_rgbToPix[g_2_pix_alloc + i + 256] = ColorHelper.RGBToColor(0, (byte)i, 0);
_rgbToPix[b_2_pix_alloc + i + 256] = ColorHelper.RGBToColor(0, 0, (byte)i);
}
// Spread out the values we have to the rest of the array so that we do
// not need to check for overflow.
for (int i = 0; i < 256; i++)
{
_rgbToPix[r_2_pix_alloc + i] = _rgbToPix[r_2_pix_alloc + 256];
_rgbToPix[r_2_pix_alloc + i + 512] = _rgbToPix[r_2_pix_alloc + 511];
_rgbToPix[g_2_pix_alloc + i] = _rgbToPix[g_2_pix_alloc + 256];
_rgbToPix[g_2_pix_alloc + i + 512] = _rgbToPix[g_2_pix_alloc + 511];
_rgbToPix[b_2_pix_alloc + i] = _rgbToPix[b_2_pix_alloc + 256];
_rgbToPix[b_2_pix_alloc + i + 512] = _rgbToPix[b_2_pix_alloc + 511];
}
}
else {
// Set up entries 16-235 in rgb-to-pixel value tables
for (int i = 16; i < 236; i++)
{
byte scaledValue = (byte)((i - 16) * 255 / 219);
_rgbToPix[r_2_pix_alloc + i + 256] = ColorHelper.RGBToColor(scaledValue, 0, 0);
_rgbToPix[g_2_pix_alloc + i + 256] = ColorHelper.RGBToColor(0, scaledValue, 0);
_rgbToPix[b_2_pix_alloc + i + 256] = ColorHelper.RGBToColor(0, 0, scaledValue);
}
// Spread out the values we have to the rest of the array so that we do
// not need to check for overflow. We have to do it here in two steps.
for (int i = 0; i < 256 + 16; i++)
{
_rgbToPix[r_2_pix_alloc + i] = _rgbToPix[r_2_pix_alloc + 256 + 16];
_rgbToPix[g_2_pix_alloc + i] = _rgbToPix[g_2_pix_alloc + 256 + 16];
_rgbToPix[b_2_pix_alloc + i] = _rgbToPix[b_2_pix_alloc + 256 + 16];
}
for (int i = 256 + 236; i < 768; i++)
{
_rgbToPix[r_2_pix_alloc + i] = _rgbToPix[r_2_pix_alloc + 256 + 236 - 1];
_rgbToPix[g_2_pix_alloc + i] = _rgbToPix[g_2_pix_alloc + 256 + 236 - 1];
_rgbToPix[b_2_pix_alloc + i] = _rgbToPix[b_2_pix_alloc + 256 + 236 - 1];
}
}
}
private static YUVToRGBLookup GetLookup(PixelFormat format, LuminanceScale scale)
{
if (_lookup != null && _lookup.PixelFormat == format && _lookup.Scale == scale)
{
return(_lookup);
}
_lookup = new YUVToRGBLookup(format, scale);
return(_lookup);
}
public static void Convert420(Surface dst, LuminanceScale scale, byte[] ySrc, byte[] uSrc, byte[] vSrc, int yWidth, int yHeight, int yPitch, int uvPitch)
{
// Sanity checks
Debug.Assert(dst != null && dst.Pixels != null);
Debug.Assert(dst.BytesPerPixel == 2 || dst.BytesPerPixel == 4);
Debug.Assert(ySrc != null && uSrc != null && vSrc != null);
Debug.Assert((yWidth & 1) == 0);
Debug.Assert((yHeight & 1) == 0);
var lookup = GetLookup(dst.PixelFormat, scale);
// Use a templated function to avoid an if check on every pixel
if (dst.BytesPerPixel == 2)
{
ConvertYUV420ToRGB(dst.Pixels, dst.Pitch, lookup, _colorTab.Value, ySrc, uSrc, vSrc, yWidth, yHeight, yPitch, uvPitch, sizeof(ushort));
}
else
{
ConvertYUV420ToRGB(dst.Pixels, dst.Pitch, lookup, _colorTab.Value, ySrc, uSrc, vSrc, yWidth, yHeight, yPitch, uvPitch, sizeof(uint));
}
}
private static YUVToRGBLookup GetLookup(PixelFormat format, LuminanceScale scale)
{
if (_lookup != null && _lookup.PixelFormat == format && _lookup.Scale == scale)
return _lookup;
_lookup = new YUVToRGBLookup(format, scale);
return _lookup;
}
public static void Convert420(Surface dst, LuminanceScale scale, byte[] ySrc, byte[] uSrc, byte[] vSrc, int yWidth, int yHeight, int yPitch, int uvPitch)
{
// Sanity checks
Debug.Assert(dst != null && dst.Pixels != null);
Debug.Assert(dst.BytesPerPixel == 2 || dst.BytesPerPixel == 4);
Debug.Assert(ySrc != null && uSrc != null && vSrc != null);
Debug.Assert((yWidth & 1) == 0);
Debug.Assert((yHeight & 1) == 0);
var lookup = GetLookup(dst.PixelFormat, scale);
// Use a templated function to avoid an if check on every pixel
if (dst.BytesPerPixel == 2)
ConvertYUV420ToRGB(dst.Pixels, dst.Pitch, lookup, _colorTab.Value, ySrc, uSrc, vSrc, yWidth, yHeight, yPitch, uvPitch, sizeof(ushort));
else
ConvertYUV420ToRGB(dst.Pixels, dst.Pitch, lookup, _colorTab.Value, ySrc, uSrc, vSrc, yWidth, yHeight, yPitch, uvPitch, sizeof(uint));
}
