---
title: "Interface IFontSubstitutionService | Customer's Canvas On-Premises"
canonical: "https://customerscanvas.com/docs/on-premises/design-atoms-cs/reference/api/Aurigma.DesignAtoms.Services/IFontSubstitutionService/"
---

# Interface IFontSubstitutionService

> `System.Collections.Generic.ICollection<System.String>`

###### **Namespace**: [Aurigma.DesignAtoms.Services](https://customerscanvas.com/docs/on-premises/design-atoms-cs/reference/api/Aurigma.DesignAtoms.Services.md)

###### **Assembly**: Aurigma.DesignAtoms.dll

```csharp title="Syntax"
public interface IFontSubstitutionService
```

## Methods

### SubstituteFonts

```csharp
ICollection<string> SubstituteFonts(Product product)
```

##### Parameters

| Type | Name | Description |
|:---|:---|:---|
| [Aurigma.DesignAtoms.Model.Product](https://customerscanvas.com/docs/on-premises/design-atoms-cs/reference/api/Aurigma.DesignAtoms.Model/Product.md) | *product* |  |

##### Returns

### SubstituteFonts

```csharp
ICollection<string> SubstituteFonts(Surface surface)
```

##### Parameters

| Type | Name | Description |
|:---|:---|:---|
| [Aurigma.DesignAtoms.Model.Surface](https://customerscanvas.com/docs/on-premises/design-atoms-cs/reference/api/Aurigma.DesignAtoms.Model/Surface.md) | *surface* |  |

##### Returns

`System.Collections.Generic.ICollection<System.String>`

### SubstituteFonts

```csharp
ICollection<string> SubstituteFonts(BaseTextItem textItem)
```

##### Parameters

| Type | Name | Description |
|:---|:---|:---|
| [Aurigma.DesignAtoms.Model.Items.BaseTextItem](https://customerscanvas.com/docs/on-premises/design-atoms-cs/reference/api/Aurigma.DesignAtoms.Model.Items/BaseTextItem.md) | *textItem* |  |

##### Returns

`System.Collections.Generic.ICollection<System.String>`

### SubstituteFonts

```csharp
ICollection<string> SubstituteFonts(GroupItem groupItem)
```

##### Parameters

| Type | Name | Description |
|:---|:---|:---|
| [Aurigma.DesignAtoms.Model.Items.GroupItem](https://customerscanvas.com/docs/on-premises/design-atoms-cs/reference/api/Aurigma.DesignAtoms.Model.Items/GroupItem.md) | *groupItem* |  |

##### Returns

`System.Collections.Generic.ICollection<System.String>`

### AllFontsAvailable

```csharp
bool AllFontsAvailable(BaseTextItem textItem)
```

##### Parameters

| Type | Name | Description |
|:---|:---|:---|
| [Aurigma.DesignAtoms.Model.Items.BaseTextItem](https://customerscanvas.com/docs/on-premises/design-atoms-cs/reference/api/Aurigma.DesignAtoms.Model.Items/BaseTextItem.md) | *textItem* |  |

##### Returns

`System.Boolean`

### ValidateSubstitutionFontPostScriptName

```csharp
void ValidateSubstitutionFontPostScriptName()
```