/// <summary>
/// Converts all bitmaps for this texture to a different format.
/// </summary>
/// <param name="newBitmapType">
/// Type being converted to.
/// The new type must be a subclass of BitmapContent,
/// such as PixelBitmapContent or DxtBitmapContent.
/// </param>
public void ConvertBitmapType(Type newBitmapType)
{
if (newBitmapType == null)
{
throw new ArgumentNullException(nameof(newBitmapType));
}
if (!newBitmapType.IsSubclassOf(typeof(BitmapContent)))
{
throw new ArgumentException(
$"Type '{newBitmapType}' is not a subclass of BitmapContent.");
}
if (newBitmapType.IsAbstract)
{
throw new ArgumentException(
$"Type '{newBitmapType}' is abstract and cannot be allocated.");
}
if (newBitmapType.ContainsGenericParameters)
{
throw new ArgumentException(
$"Type '{newBitmapType}' contains generic parameters and cannot be allocated.");
}
if (newBitmapType.GetConstructor(new Type[2] {
typeof(int), typeof(int)
}) == null)
{
throw new ArgumentException(
$"Type '{newBitmapType} does not have a " +
$"constructor with signature (int, int) and cannot be allocated.");
}
foreach (var mipChain in Faces)
{
for (var i = 0; i < mipChain.Count; i++)
{
var src = mipChain[i];
if (src.GetType() != newBitmapType)
{
var dst = (BitmapContent)Activator.CreateInstance(
newBitmapType, new object[] { src.Width, src.Height });
BitmapContent.Copy(src, dst);
mipChain[i] = dst;
}
}
}
}
// 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);
}
}
/// <summary>
/// Generates a full set of mipmaps for the texture.
/// </summary>
/// <param name="overwriteExistingMipmaps">
/// true if the existing mipmap set is replaced with the new set; false otherwise.
/// </param>
public virtual void GenerateMipmaps(bool overwriteExistingMipmaps)
{
// If we already have mipmaps and we're not supposed to overwrite
// them then return without any generation.
if (!overwriteExistingMipmaps && Faces.Any(f => f.Count > 1))
{
return;
}
// Generate the mips for each face.
foreach (var face in Faces)
{
// Remove any existing mipmaps.
var faceBitmap = face[0];
face.Clear();
face.Add(faceBitmap);
var faceType = faceBitmap.GetType();
int width = faceBitmap.Width;
int height = faceBitmap.Height;
while (width > 1 || height > 1)
{
if (width > 1)
{
width /= 2;
}
if (height > 1)
{
height /= 2;
}
var mip = (BitmapContent)Activator.CreateInstance(
faceType, new object[] { width, height });
BitmapContent.Copy(faceBitmap, mip);
face.Add(mip);
}
}
}
