harmony 鸿蒙image_effect_filter.h

2025-06-12
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image_effect_filter.h

Overview

The image_effect_filter.h file declares the APIs related to an image effect filter.

With these APIs, you can quickly implement basic effect processing or connect multiple filters in series in an image effector to implement complex effect processing. The system provides basic effect processing filters such as brightness and crop filters.

Library: libimage_effect.so

File to include: <multimedia/image_effect/image_effect_filter.h>

System capability: SystemCapability.Multimedia.ImageEffect.Core

Since: 12

Related module: ImageEffect

Summary

Structs

Name	Description
union ImageEffect_DataValue	Describes the data values.
struct ImageEffect_Any	Describes the image effect parameters.
struct ImageEffect_FilterNames	Describes the filter name information.
struct ImageEffect_FilterDelegate	Describes the callback functions of a custom filter.
struct ImageEffect_Region	Describes the image region.
struct ImageEffect_Size	Describes the image size.

Macros

Name	Description
OH_EFFECT_BRIGHTNESS_FILTER “Brightness”	Brightness filter. The corresponding parameter is OH_EFFECT_FILTER_INTENSITY_KEY and the parameter type is EFFECT_DATA_TYPE_FLOAT.
OH_EFFECT_CONTRAST_FILTER “Contrast”	Contrast filter. The corresponding parameter is OH_EFFECT_FILTER_INTENSITY_KEY and the parameter type is EFFECT_DATA_TYPE_FLOAT.
OH_EFFECT_CROP_FILTER “Crop”	Crop filter. The corresponding parameter is OH_EFFECT_FILTER_REGION_KEY, the parameter type is EFFECT_DATA_TYPE_PTR, and the parameter value is ImageEffect_Region.
OH_EFFECT_FILTER_INTENSITY_KEY “FilterIntensity”	Intensity filter.
OH_EFFECT_FILTER_REGION_KEY “FilterRegion”	Image region filter.

Types

Name	Description
typedef struct OH_EffectFilter OH_EffectFilter	Defines a struct for the image effect filter.
typedef enum ImageEffect_DataType ImageEffect_DataType	Defines an enum for the data types.
typedef union ImageEffect_DataValue ImageEffect_DataValue	Defines a union for the data values.
typedef struct ImageEffect_Any ImageEffect_Any	Defines a struct for the image effect parameters.
typedef enum ImageEffect_Format ImageEffect_Format	Defines an enum for the pixel formats.
typedef enum ImageEffect_BufferType ImageEffect_BufferType	Defines an enum for the buffer types.
typedef struct OH_EffectFilterInfo OH_EffectFilterInfo	Defines a struct for the filter information.
typedef struct ImageEffect_FilterNames ImageEffect_FilterNames	Defines a struct for the filter name information.
typedef struct OH_EffectBufferInfo OH_EffectBufferInfo	Defines a struct for the buffer information.
typedef bool(* OH_EffectFilterDelegate_SetValue) (OH_EffectFilter filter, const char key, const ImageEffect_Any *value)	Defines a pointer to the callback function for setting parameters of a custom filter. It is used to verify parameters and parameter values.
typedef void(* OH_EffectFilterDelegate_PushData) (OH_EffectFilter filter, OH_EffectBufferInfo info)	Defines a pointer to the callback function used by a custom filter to push image data to the next-level filter.
typedef bool(* OH_EffectFilterDelegate_Render) (OH_EffectFilter filter, OH_EffectBufferInfo info, OH_EffectFilterDelegate_PushData pushData)	Defines a pointer to the callback function for rendering an image using a custom filter.
typedef bool(* OH_EffectFilterDelegate_Save) (OH_EffectFilter filter, char *info)	Defines a pointer to the callback function for serializing a custom filter. Filters are serialized in JSON format.
typedef OH_EffectFilter ( OH_EffectFilterDelegate_Restore) (const char *info)	Defines a pointer to the callback function for deserializing a custom filter.
typedef struct ImageEffect_FilterDelegate ImageEffect_FilterDelegate	Describes the callback functions of a custom filter.
typedef struct ImageEffect_Region ImageEffect_Region	Defines a struct for the image region.
typedef struct ImageEffect_Size ImageEffect_Size	Defines a struct for the image size.

Enums

Name	Description
ImageEffect_DataType { EFFECT_DATA_TYPE_UNKNOWN = 0, EFFECT_DATA_TYPE_INT32 = 1, EFFECT_DATA_TYPE_FLOAT = 2, EFFECT_DATA_TYPE_DOUBLE = 3, EFFECT_DATA_TYPE_CHAR = 4, EFFECT_DATA_TYPE_LONG = 5, EFFECT_DATA_TYPE_BOOL = 6, EFFECT_DATA_TYPE_PTR = 7 }	Enumerates the data types.
ImageEffect_Format { EFFECT_PIXEL_FORMAT_UNKNOWN = 0, EFFECT_PIXEL_FORMAT_RGBA8888 = 1, EFFECT_PIXEL_FORMAT_NV21 = 2, EFFECT_PIXEL_FORMAT_NV12 = 3, EFFECT_PIXEL_FORMAT_RGBA1010102 = 4, EFFECT_PIXEL_FORMAT_YCBCR_P010 = 5, EFFECT_PIXEL_FORMAT_YCRCB_P010 = 6 }	Enumerates the pixel formats.
ImageEffect_BufferType { EFFECT_BUFFER_TYPE_UNKNOWN = 0, EFFECT_BUFFER_TYPE_PIXEL = 1, EFFECT_BUFFER_TYPE_TEXTURE = 2 }	Enumerates the buffer types.

Functions

Name	Description
OH_EffectFilterInfo * OH_EffectFilterInfo_Create ()	Creates an OH_EffectFilterInfo instance. The instance must be released by calling OH_EffectFilterInfo_Release when it is no longer needed.
ImageEffect_ErrorCode OH_EffectFilterInfo_SetFilterName (OH_EffectFilterInfo info, const char name)	Sets a filter name.
ImageEffect_ErrorCode OH_EffectFilterInfo_GetFilterName (OH_EffectFilterInfo info, char *name)	Obtains a filter name.
ImageEffect_ErrorCode OH_EffectFilterInfo_SetSupportedBufferTypes (OH_EffectFilterInfo info, uint32_t size, ImageEffect_BufferType bufferTypeArray)	Sets the buffer types supported by a filter.
ImageEffect_ErrorCode OH_EffectFilterInfo_GetSupportedBufferTypes (OH_EffectFilterInfo info, uint32_t size, ImageEffect_BufferType **bufferTypeArray)	Obtains the buffer types supported by a filter.
ImageEffect_ErrorCode OH_EffectFilterInfo_SetSupportedFormats (OH_EffectFilterInfo info, uint32_t size, ImageEffect_Format formatArray)	Sets the pixel formats supported by a filter.
ImageEffect_ErrorCode OH_EffectFilterInfo_GetSupportedFormats (OH_EffectFilterInfo info, uint32_t size, ImageEffect_Format **formatArray)	Obtains the pixel formats supported by a filter.
ImageEffect_ErrorCode OH_EffectFilterInfo_Release (OH_EffectFilterInfo *info)	Destroys an OH_EffectFilterInfo instance.
OH_EffectBufferInfo * OH_EffectBufferInfo_Create ()	Creates an OH_EffectBufferInfo instance. The instance must be released by calling OH_EffectBufferInfo_Release when it is no longer needed.
ImageEffect_ErrorCode OH_EffectBufferInfo_SetAddr (OH_EffectBufferInfo info, void addr)	Sets the address of an effect buffer.
ImageEffect_ErrorCode OH_EffectBufferInfo_GetAddr (OH_EffectBufferInfo info, void *addr)	Obtains the address of an effect buffer.
ImageEffect_ErrorCode OH_EffectBufferInfo_SetWidth (OH_EffectBufferInfo *info, int32_t width)	Sets the image width.
ImageEffect_ErrorCode OH_EffectBufferInfo_GetWidth (OH_EffectBufferInfo info, int32_t width)	Obtains the image width.
ImageEffect_ErrorCode OH_EffectBufferInfo_SetHeight (OH_EffectBufferInfo *info, int32_t height)	Sets the image height.
ImageEffect_ErrorCode OH_EffectBufferInfo_GetHeight (OH_EffectBufferInfo info, int32_t height)	Obtains the image height.
ImageEffect_ErrorCode OH_EffectBufferInfo_SetRowSize (OH_EffectBufferInfo *info, int32_t rowSize)	Sets the number of bytes per row for an image.
ImageEffect_ErrorCode OH_EffectBufferInfo_GetRowSize (OH_EffectBufferInfo info, int32_t rowSize)	Obtains the number of bytes per row of an image.
ImageEffect_ErrorCode OH_EffectBufferInfo_SetEffectFormat (OH_EffectBufferInfo *info, ImageEffect_Format format)	Sets the pixel format for an image.
ImageEffect_ErrorCode OH_EffectBufferInfo_GetEffectFormat (OH_EffectBufferInfo info, ImageEffect_Format format)	Obtains the pixel format of an image.
ImageEffect_ErrorCode OH_EffectBufferInfo_Release (OH_EffectBufferInfo *info)	Destroys an OH_EffectBufferInfo instance.
OH_EffectFilter * OH_EffectFilter_Create (const char *name)	Creates an OH_EffectFilter instance. The instance must be released by calling OH_EffectFilter_Release when it is no longer needed.
ImageEffect_ErrorCode OH_EffectFilter_SetValue (OH_EffectFilter filter, const char key, const ImageEffect_Any *value)	Sets a filter parameter.
ImageEffect_ErrorCode OH_EffectFilter_GetValue (OH_EffectFilter filter, const char key, ImageEffect_Any *value)	Obtains a filter parameter.
ImageEffect_ErrorCode OH_EffectFilter_Register (const OH_EffectFilterInfo info, const ImageEffect_FilterDelegate delegate)	Registers a custom filter.
ImageEffect_FilterNames * OH_EffectFilter_LookupFilters (const char *key)	Obtains filters that meet given conditions.
void OH_EffectFilter_ReleaseFilterNames ()	Releases filter name memory resources.
ImageEffect_ErrorCode OH_EffectFilter_LookupFilterInfo (const char name, OH_EffectFilterInfo info)	Obtains the filter information.
ImageEffect_ErrorCode OH_EffectFilter_Render (OH_EffectFilter filter, OH_PixelmapNative inputPixelmap, OH_PixelmapNative *outputPixelmap)	Starts image rendering.
ImageEffect_ErrorCode OH_EffectFilter_Release (OH_EffectFilter *filter)	Destroys an OH_EffectFilter instance.