/// <summary>
/// Combine all sprites into a single texture and save it to disk.
/// </summary>
static public bool UpdateTexture(UIAtlas atlas, List <SpriteEntry> sprites)
{
// Get the texture for the atlas
Texture2D tex = atlas.texture as Texture2D;
Texture2D alphaTex = null;
string oldPath = (tex != null) ? AssetDatabase.GetAssetPath(tex.GetInstanceID()) : "";
string newPath = NGUIEditorTools.GetSaveableTexturePath(atlas);
string alphaPath = newPath.Replace(".png", "`alpha.png");
// Clear the read-only flag in texture file attributes
if (System.IO.File.Exists(newPath))
{
System.IO.FileAttributes newPathAttrs = System.IO.File.GetAttributes(newPath);
newPathAttrs &= ~System.IO.FileAttributes.ReadOnly;
System.IO.File.SetAttributes(newPath, newPathAttrs);
}
bool newTexture = (tex == null || oldPath != newPath);
if (newTexture)
{
// Create a new texture for the atlas
tex = new Texture2D(1, 1, TextureFormat.ARGB32, false);
}
else
{
// Make the atlas readable so we can save it
if (tex.format.ToString().EndsWith("32"))
{
tex = NGUIEditorTools.ImportTexture(oldPath, true, false, false);
}
else
{
tex = new Texture2D(tex.width, tex.height, TextureFormat.ARGB32, false);
}
}
bool alphaSplit = NGUISettings.atlasAlphaSplit && !atlas.premultipliedAlpha;
if (!alphaSplit)
{
alphaTex = NGUIEditorTools.ImportTexture(alphaPath, true, true, false);
if (alphaTex != null)
{
tex = AlphaMerge(tex, alphaTex);
byte[] bytes = tex.EncodeToPNG();
System.IO.File.WriteAllBytes(newPath, bytes);
bytes = null;
AssetDatabase.SaveAssets();
AssetDatabase.DeleteAsset(alphaPath);
AssetDatabase.Refresh(ImportAssetOptions.ForceSynchronousImport);
tex = NGUIEditorTools.ImportTexture(newPath, true, true, true);
}
}
// Pack the sprites into this texture
if (PackTextures(tex, sprites))
{
atlas.InitSize(tex);
if (alphaSplit)
{
alphaTex = AlphaSplit(ref tex);
byte[] alphaBytes = alphaTex.EncodeToPNG();
System.IO.File.WriteAllBytes(alphaPath, alphaBytes);
}
byte[] bytes = tex.EncodeToPNG();
System.IO.File.WriteAllBytes(newPath, bytes);
// Load the texture we just saved as a Texture2D
AssetDatabase.SaveAssets();
AssetDatabase.Refresh(ImportAssetOptions.ForceSynchronousImport);
tex = NGUIEditorTools.ImportTexture(newPath, false, true, !atlas.premultipliedAlpha && !alphaSplit);
if (alphaSplit)
{
alphaTex = NGUIEditorTools.ImportTexture(alphaPath, false, true, false);
}
// Update the atlas texture
if (newTexture)
{
if (tex == null)
{
Debug.LogError("Failed to load the created atlas saved as " + newPath);
}
else
{
atlas.spriteMaterial.mainTexture = tex;
if (alphaTex != null)
{
atlas.spriteMaterial.SetTexture("_AlphaTex", alphaTex);
}
}
ReleaseSprites(sprites);
AssetDatabase.SaveAssets();
AssetDatabase.Refresh(ImportAssetOptions.ForceSynchronousImport);
}
return(true);
}
else
{
if (!newTexture)
{
NGUIEditorTools.ImportTexture(oldPath, false, true, !atlas.premultipliedAlpha);
}
//Debug.LogError("Operation canceled: The selected sprites can't fit into the atlas.\n" +
// "Keep large sprites outside the atlas (use UITexture), and/or use multiple atlases instead.");
EditorUtility.DisplayDialog("Operation Canceled", "The selected sprites can't fit into the atlas.\n" +
"Keep large sprites outside the atlas (use UITexture), and/or use multiple atlases instead", "OK");
return(false);
}
}
