/// <summary>
/// Attempts to reserve a position on a texture atlas for the specified surface, and if the reservation
/// is successful, blits the surface to the atlas.
/// </summary>
private static Boolean BlitSurfaceToDynamicTextureAtlas(DynamicTextureAtlas atlas, Surface2D surface)
{
if (!atlas.TryReserveCell(surface.Width, surface.Height, out var reservation))
{
return(false);
}
surface.ProcessAlpha(true, Color.Magenta);
surface.Blit(atlas.Surface, new Point2(reservation.X, reservation.Y), atlas.IsFlipped ?
SurfaceFlipDirection.Vertical : SurfaceFlipDirection.None);
return(true);
}
public void DynamicTextureAtlas_IsConstructedCorrectly()
{
var sbatch = default(SpriteBatch);
var atlas = default(DynamicTextureAtlas);
var surface = default(Surface2D);
var result = GivenAnUltravioletApplication()
.WithContent(content =>
{
sbatch = SpriteBatch.Create();
atlas = DynamicTextureAtlas.Create(512, 512, 8);
surface = content.Load <Surface2D>("Surfaces/bear");
TheResultingValue(BlitSurfaceToDynamicTextureAtlas(atlas, surface)).ShouldBe(true);
surface = content.Load <Surface2D>("Surfaces/frog");
TheResultingValue(BlitSurfaceToDynamicTextureAtlas(atlas, surface)).ShouldBe(true);
surface = content.Load <Surface2D>("Surfaces/pig");
TheResultingValue(BlitSurfaceToDynamicTextureAtlas(atlas, surface)).ShouldBe(true);
surface = content.Load <Surface2D>("Surfaces/panda");
TheResultingValue(BlitSurfaceToDynamicTextureAtlas(atlas, surface)).ShouldBe(true);
surface = content.Load <Surface2D>("Surfaces/dog");
TheResultingValue(BlitSurfaceToDynamicTextureAtlas(atlas, surface)).ShouldBe(true);
surface = content.Load <Surface2D>("Surfaces/walrus");
TheResultingValue(BlitSurfaceToDynamicTextureAtlas(atlas, surface)).ShouldBe(true);
})
.Render(uv =>
{
uv.GetGraphics().Clear(Color.CornflowerBlue);
sbatch.Begin(SpriteSortMode.Immediate, BlendState.AlphaBlend);
sbatch.Draw(atlas, Vector2.Zero, Color.White);
sbatch.End();
});
TheResultingImage(result)
.ShouldMatch(@"Resources/Expected/Graphics/DynamicTextureAtlas_IsConstructedCorrectly.png");
}
