xref: /docs/en/application-dev/reference/apis-arkgraphics2d/effect_kit.md

# EffectKit


## Overview

The EffectKit module provides the basic image processing capabilities, including brightness adjustment, blurring, and grayscale adjustment.

**Since**: 12


## Summary


### File

| Name| Description|
| -------- | -------- |
| [effect_filter.h](effect__filter_8h.md) | Declares the APIs of an image effect filter.|
| [effect_types.h](effect__types_8h.md) | Declares the data types of the image effect filter.|


### Structs

| Name| Description|
| -------- | -------- |
| struct  [OH_Filter](_o_h___filter.md) | Describes a filter used to generate a filter pixel map.|
| struct  [OH_Filter_ColorMatrix](_o_h___filter___color_matrix.md) | Describes a matrix used to create an effect filter.|


### Types

| Name| Description|
| -------- | -------- |
| typedef struct [OH_Filter](_o_h___filter.md)  [pixelMap](#pixelmap) | Defines a struct for a filter used to generate a filter pixel map.|
| typedef enum [EffectErrorCode](#effecterrorcode)  [EffectErrorCode](#effecterrorcode) | Defines an enum for the status codes that may be used by the effect filter.|


### Enums

| Name| Description|
| -------- | -------- |
| [EffectErrorCode](#effecterrorcode) { EFFECT_SUCCESS = 0, EFFECT_BAD_PARAMETER = 401, EFFECT_UNSUPPORTED_OPERATION = 7600201, EFFECT_UNKNOWN_ERROR = 7600901 } | Enumerates the status codes that may be used by the effect filter.|


### Functions

| Name| Description|
| -------- | -------- |
| [EffectErrorCode](#effecterrorcode) [OH_Filter_CreateEffect](#oh_filter_createeffect) (OH_PixelmapNative \*pixelmap, [OH_Filter](_o_h___filter.md) \*\*filter) | Creates an **OH_Filter** object.|
| [EffectErrorCode](#effecterrorcode) [OH_Filter_Release](#oh_filter_release) ([OH_Filter](_o_h___filter.md) \*filter) | Releases an **OH_Filter** object.|
| [EffectErrorCode](#effecterrorcode) [OH_Filter_Blur](#oh_filter_blur) ([OH_Filter](_o_h___filter.md) \*filter, float radius) | Creates the frosted glass effect and adds it to a filter.|
| [EffectErrorCode](#effecterrorcode) [OH_Filter_Brighten](#oh_filter_brighten) ([OH_Filter](_o_h___filter.md) \*filter, float brightness) | Creates the brightening effect and adds it to a filter.|
| [EffectErrorCode](#effecterrorcode) [OH_Filter_GrayScale](#oh_filter_grayscale) ([OH_Filter](_o_h___filter.md) \*filter) | Creates the grayscale effect and adds it to a filter.|
| [EffectErrorCode](#effecterrorcode) [OH_Filter_Invert](#oh_filter_invert) ([OH_Filter](_o_h___filter.md) \*filter) | Creates the inverted color effect and adds it to a filter.|
| [EffectErrorCode](#effecterrorcode) [OH_Filter_SetColorMatrix](#oh_filter_setcolormatrix) ([OH_Filter](_o_h___filter.md) \*filter, [OH_Filter_ColorMatrix](_o_h___filter___color_matrix.md) \*matrix) | Creates a custom effect through a matrix and adds it to a filter.|
| [EffectErrorCode](#effecterrorcode) [OH_Filter_GetEffectPixelMap](#oh_filter_geteffectpixelmap) ([OH_Filter](_o_h___filter.md) \*filter, OH_PixelmapNative \*\*pixelmap) | Obtains the pixel map used to create a filter.|


## Type Description


### EffectErrorCode

```
typedef enum EffectErrorCode EffectErrorCode
```

**Description**

Defines an enum for the status codes that may be used by the effect filter.

**Since**: 12


### pixelMap

```
typedef struct OH_Filter pixelMap
```

**Description**

Defines a struct for a filter used to generate a filter pixel map. 

**Since**: 12 


## Enum Description


### EffectErrorCode

```
enum EffectErrorCode
```

**Description**

Enumerates the status codes that may be used by the effect filter.

**Since**: 12

| Value| Description|
| -------- | -------- |
| EFFECT_SUCCESS | Operation successful.|
| EFFECT_BAD_PARAMETER | Invalid parameter.|
| EFFECT_UNSUPPORTED_OPERATION | Unsupported operation.|
| EFFECT_UNKNOWN_ERROR | Unknown error.|


## Function Description


### OH_Filter_Blur()

```
EffectErrorCode OH_Filter_Blur (OH_Filter* filter, float radius )
```

**Description**

Creates the frosted glass effect and adds it to a filter.

**Since**: 12

**Parameters**

| Name| Description|
| -------- | -------- |
| filter | Pointer to the filter.|
| radius | Blur radius of the frosted glass effect, in px.|

**Returns**

Returns a status code defined in [EffectErrorCode](#effecterrorcode).


### OH_Filter_Brighten()

```
EffectErrorCode OH_Filter_Brighten (OH_Filter* filter, float brightness )
```

**Description**

Creates the brightening effect and adds it to a filter.

**Since**: 12

**Parameters**

| Name| Description|
| -------- | -------- |
| filter | Pointer to the filter.|
| brightness | Luminance of the brightening effect. The value ranges from 0 to 1. When the value is **0**, the image remains unchanged.|

**Returns**

Returns a status code defined in [EffectErrorCode](#effecterrorcode).


### OH_Filter_CreateEffect()

```
EffectErrorCode OH_Filter_CreateEffect (OH_PixelmapNative* pixelmap, OH_Filter** filter )
```

**Description**

Creates an **OH_Filter** object.

**Since**: 12

**Parameters**

| Name| Description|
| -------- | -------- |
| pixelmap | Pointer to the pixel map.|
| filter | Double pointer to the filter created.|

**Returns**

Returns a status code defined in [EffectErrorCode](#effecterrorcode).


### OH_Filter_GetEffectPixelMap()

```
EffectErrorCode OH_Filter_GetEffectPixelMap (OH_Filter* filter, OH_PixelmapNative** pixelmap )
```

**Description**

Obtains the pixel map used to create a filter.

**Since**: 12

**Parameters**

| Name| Description|
| -------- | -------- |
| filter | Pointer to the filter.|
| pixelmap | Double pointer to the pixel map obtained.|

**Returns**

Returns a status code defined in [EffectErrorCode](#effecterrorcode).


### OH_Filter_GrayScale()

```
EffectErrorCode OH_Filter_GrayScale (OH_Filter* filter)
```

**Description**

Creates the grayscale effect and adds it to a filter.

**Since**: 12

**Parameters**

| Name| Description|
| -------- | -------- |
| filter | Pointer to the filter.|

**Returns**

Returns a status code defined in [EffectErrorCode](#effecterrorcode).


### OH_Filter_Invert()

```
EffectErrorCode OH_Filter_Invert (OH_Filter* filter)
```

**Description**

Creates the inverted color effect and adds it to a filter.

**Since**: 12

**Parameters**

| Name| Description|
| -------- | -------- |
| filter | Pointer to the filter.|

**Returns**

Returns a status code defined in [EffectErrorCode](#effecterrorcode).


### OH_Filter_Release()

```
EffectErrorCode OH_Filter_Release (OH_Filter* filter)
```

**Description**

Releases an **OH_Filter** object.

**Since**: 12

**Parameters**

| Name| Description|
| -------- | -------- |
| filter | Pointer to the filter.|

**Returns**

Returns a status code defined in [EffectErrorCode](#effecterrorcode).


### OH_Filter_SetColorMatrix()

```
EffectErrorCode OH_Filter_SetColorMatrix (OH_Filter* filter, OH_Filter_ColorMatrix* matrix )
```

**Description**

Creates a custom effect through a matrix and adds it to a filter.

**Since**: 12

**Parameters**

| Name| Description|
| -------- | -------- |
| filter | Pointer to the filter.|
| matrix | Pointer to a custom matrix, which is an [OH_Filter_ColorMatrix](_o_h___filter___color_matrix.md) object.|

**Returns**

Returns a status code defined in [EffectErrorCode](#effecterrorcode).