/// <summary>
/// Initializes a new instance of the <see cref="DynamicTextureAtlas"/> class.
/// </summary>
/// <param name="uv">The Ultraviolet context.</param>
/// <param name="width">The width of the texture atlas in pixels.</param>
/// <param name="height">The height of the texture atlas in pixels.</param>
/// <param name="spacing">The number of pixels between cells on the texture atlas.</param>
/// <param name="options">The texture's configuration options.</param>
private DynamicTextureAtlas(UltravioletContext uv, Int32 width, Int32 height, Int32 spacing, TextureOptions options)
: base(uv)
{
Contract.EnsureRange(width > 0, nameof(width));
Contract.EnsureRange(height > 0, nameof(height));
Contract.EnsureRange(spacing >= 0, nameof(spacing));
var isSrgb = (options & TextureOptions.SrgbColor) == TextureOptions.SrgbColor;
var isLinear = (options & TextureOptions.LinearColor) == TextureOptions.LinearColor;
if (isSrgb && isLinear)
{
throw new ArgumentException(UltravioletStrings.TextureCannotHaveMultipleEncodings);
}
var caps = uv.GetGraphics().Capabilities;
var srgbEncoded = (isLinear ? false : (isSrgb ? true : uv.Properties.SrgbDefaultForTexture2D)) && caps.SrgbEncodingEnabled;
var surfOptions = (srgbEncoded ? SurfaceOptions.SrgbColor : SurfaceOptions.LinearColor);
this.IsFlipped = Ultraviolet.GetGraphics().Capabilities.FlippedTextures;
this.Width = width;
this.Height = height;
this.Spacing = spacing;
this.Surface = Surface2D.Create(width, height, surfOptions);
this.Texture = Texture2D.CreateDynamicTexture(width, height, options, this, (dt2d, state) =>
{
((DynamicTextureAtlas)state).Flush();
});
Clear(true);
Invalidate();
}
/// <summary>
/// Creates the output surface for a texture atlas.
/// </summary>
private static Surface2D CreateOutputSurface(TextureAtlasDescription atlasDesc, IEnumerable <TextureAtlasImage> atlasImages,
ContentManager content, IContentProcessorMetadata metadata, Int32 width, Int32 height, Dictionary <String, Rectangle> images)
{
var output = Surface2D.Create(width, height);
foreach (var image in atlasImages)
{
var imageArea = images[image.Name];
using (var imageSurface = content.Load <Surface2D>(image.Path, metadata.AssetDensity, false, metadata.IsLoadedFromSolution))
{
var areaWithoutPadding = new Rectangle(
imageArea.X,
imageArea.Y,
imageArea.Width - atlasDesc.Metadata.Padding,
imageArea.Height - atlasDesc.Metadata.Padding);
imageSurface.Blit(output, areaWithoutPadding);
}
}
return(output);
}