// Once arranging is complete, copies each glyph to its chosen position in the single larger output bitmap.
static PixelBitmapContent <Color> CopyGlyphsToOutput(
List <ArrangedGlyph> glyphs, int width, int height)
{
var output = new PixelBitmapContent <Color>(width, height);
foreach (var glyph in glyphs)
{
var sourceGlyph = glyph.Source;
var sourceRegion = sourceGlyph.Subrect;
var destinationRegion = new Rectangle(glyph.X + 1, glyph.Y + 1, sourceRegion.Width, sourceRegion.Height);
BitmapContent.Copy(sourceGlyph.Bitmap, sourceRegion, output, destinationRegion);
sourceGlyph.Bitmap = output;
sourceGlyph.Subrect = destinationRegion;
}
return(output);
}
internal static PixelBitmapContent <RgbaVector> Resize(
this BitmapContent bitmap, int newWidth, int newHeight)
{
BitmapContent src = bitmap;
src.TryGetFormat(out SurfaceFormat format);
if (format != SurfaceFormat.Vector4)
{
var v4 = new PixelBitmapContent <RgbaVector>(src.Width, src.Height);
BitmapContent.Copy(src, v4);
src = v4;
}
using (var image = Image.WrapMemory <RgbaVector>(src.GetPixelData(), new Size(src.Height, src.Width)))
using (var resized = image.ProcessRows(x => x.Resize(new Size(newWidth, newHeight), 0)))
{
var result = new PixelBitmapContent <RgbaVector>(newWidth, newHeight);
result.SetPixelData(resized.GetPixelSpan());
return(result);
}
}
protected override bool TryCopyFrom(BitmapContent sourceBitmap, Rectangle sourceRegion, Rectangle destinationRegion)
{
if (!sourceBitmap.TryGetFormat(out SurfaceFormat sourceFormat))
{
return(false);
}
TryGetFormat(out SurfaceFormat format);
// A shortcut for copying the entire bitmap to another bitmap of the same type and format
if (format == sourceFormat &&
sourceRegion == new Rectangle(0, 0, Width, Height) &&
sourceRegion == destinationRegion)
{
SetPixelData(sourceBitmap.GetPixelData());
return(true);
}
// TODO: Add a XNA unit test to see what it does
// my guess is that this is invalid for DXT.
//
// Destination region copy is not yet supported
if (destinationRegion != new Rectangle(0, 0, Width, Height))
{
return(false);
}
if (sourceBitmap is PixelBitmapContent <RgbaVector> &&
sourceRegion.Width == destinationRegion.Width &&
sourceRegion.Height == destinationRegion.Height)
{
// NVTT wants 8bit data in BGRA format.
var colorBitmap = new PixelBitmapContent <Bgra32>(sourceBitmap.Width, sourceBitmap.Height);
Copy(sourceBitmap, colorBitmap);
var sourceData = colorBitmap.GetPixelData();
AlphaMode alphaMode;
Format outputFormat;
bool alphaDither = false;
switch (format)
{
case SurfaceFormat.Dxt1:
case SurfaceFormat.Dxt1SRgb:
{
PrepareNVTT_DXT1(sourceData, out bool hasTransparency);
outputFormat = hasTransparency ? Format.DXT1a : Format.DXT1;
alphaMode = hasTransparency ? AlphaMode.Transparency : AlphaMode.None;
alphaDither = true;
break;
}
case SurfaceFormat.Dxt3:
case SurfaceFormat.Dxt3SRgb:
{
//PrepareNVTT(sourceData);
outputFormat = Format.DXT3;
alphaMode = AlphaMode.Transparency;
break;
}
case SurfaceFormat.Dxt5:
case SurfaceFormat.Dxt5SRgb:
{
//PrepareNVTT(sourceData);
outputFormat = Format.DXT5;
alphaMode = AlphaMode.Transparency;
break;
}
default:
throw new InvalidOperationException("Invalid DXT surface format!");
}
// Do all the calls to the NVTT wrapper within this handler
// so we properly clean up if things blow up.
var dataHandle = GCHandle.Alloc(sourceData, GCHandleType.Pinned);
try
{
var dataPtr = dataHandle.AddrOfPinnedObject();
var inputOptions = new InputOptions();
inputOptions.SetTextureLayout(TextureType.Texture2D, colorBitmap.Width, colorBitmap.Height, 1);
inputOptions.SetMipmapData(dataPtr, colorBitmap.Width, colorBitmap.Height, 1, 0, 0);
inputOptions.SetMipmapGeneration(false);
inputOptions.SetGamma(1.0f, 1.0f);
inputOptions.SetAlphaMode(alphaMode);
var compressionOptions = new CompressionOptions();
compressionOptions.SetFormat(outputFormat);
compressionOptions.SetQuality(Quality.Normal);
// TODO: This isn't working which keeps us from getting the
// same alpha dither behavior on DXT1 as XNA.
//
// See https://github.com/MonoGame/MonoGame/issues/6259
//
//if (alphaDither)
//compressionOptions.SetQuantization(false, false, true);
var outputOptions = new OutputOptions();
outputOptions.SetOutputHeader(false);
outputOptions.SetOutputOptionsOutputHandler(NvttBeginImage, NvttWriteImage, NvttEndImage);
var dxtCompressor = new Compressor();
dxtCompressor.Compress(inputOptions, compressionOptions, outputOptions);
}
finally
{
dataHandle.Free();
}
return(true);
}
try
{
Copy(sourceBitmap, sourceRegion, this, destinationRegion);
return(true);
}
catch (InvalidOperationException)
{
return(false);
}
}
// Rasterizes a single character glyph.
private Glyph ImportGlyph(Rune character, Face face)
{
uint glyphIndex = face.GetCharIndex((uint)character.Value);
face.LoadGlyph(glyphIndex, LoadFlags.Default, LoadTarget.Normal);
face.Glyph.RenderGlyph(RenderMode.Normal);
// Render the character.
BitmapContent glyphBitmap = null;
if (face.Glyph.Bitmap.Width > 0 && face.Glyph.Bitmap.Rows > 0)
{
glyphBitmap = new PixelBitmapContent <Alpha8>(face.Glyph.Bitmap.Width, face.Glyph.Bitmap.Rows);
byte[] gpixelAlphas = new byte[face.Glyph.Bitmap.Width * face.Glyph.Bitmap.Rows];
//if the character bitmap has 1bpp we have to expand the buffer data to get the 8bpp pixel data
//each byte in bitmap.bufferdata contains the value of to 8 pixels in the row
//if bitmap is of width 10, each row has 2 bytes with 10 valid bits, and the last 6 bits of 2nd byte must be discarded
if (face.Glyph.Bitmap.PixelMode == PixelMode.Mono)
{
//variables needed for the expansion, amount of written data, length of the data to write
int written = 0, length = face.Glyph.Bitmap.Width * face.Glyph.Bitmap.Rows;
for (int i = 0; written < length; i++)
{
//width in pixels of each row
int width = face.Glyph.Bitmap.Width;
while (width > 0)
{
//valid data in the current byte
int stride = Math.Min(8, width);
//copy the valid bytes to pixeldata
//System.Array.Copy(ExpandByte(face.Glyph.Bitmap.BufferData[i]), 0, gpixelAlphas, written, stride);
ExpandByteAndCopy(face.Glyph.Bitmap.BufferData[i], stride, gpixelAlphas, written);
written += stride;
width -= stride;
if (width > 0)
{
i++;
}
}
}
}
else
{
Marshal.Copy(face.Glyph.Bitmap.Buffer, gpixelAlphas, 0, gpixelAlphas.Length);
}
glyphBitmap.SetPixelData(gpixelAlphas);
}
if (glyphBitmap == null)
{
var gHA = face.Glyph.Metrics.HorizontalAdvance >> 6;
var gVA = face.Size.Metrics.Height >> 6;
gHA = gHA > 0 ? gHA : gVA;
gVA = gVA > 0 ? gVA : gHA;
glyphBitmap = new PixelBitmapContent <Alpha8>(gHA, gVA);
}
// not sure about this at all
var abc = new ABCFloat
{
A = face.Glyph.Metrics.HorizontalBearingX >> 6,
B = face.Glyph.Metrics.Width >> 6
};
abc.C = (face.Glyph.Metrics.HorizontalAdvance >> 6) - (abc.A + abc.B);
// Construct the output Glyph object.
return(new Glyph(character, glyphBitmap)
{
XOffset = -(face.Glyph.Advance.X >> 6),
XAdvance = face.Glyph.Metrics.HorizontalAdvance >> 6,
YOffset = -(face.Glyph.Metrics.HorizontalBearingY >> 6),
CharacterWidths = abc
});
}
