mlib_VideoColorBlendABGR_Inp

, mlib_VideoColorBlendABGR_ResetAlpha_Inp

- in-place image blend

Synopsis

cc [ flag... ] file... -lmlib [ library... ]
#include <mlib.h>

void mlib_VideoColorBlendABGR_Inp(mlib_u32 *src1dst, 
     const mlib_u32 *src2,mlib_s32 src1dst_w,
     mlib_s32 src1dst_h,mlib_s32 src2_w,
     mlib_s32 src2_h,mlib_s32 src2_x,
     mlib_s32 src2_y,mlib_s32 src1dst_lb,
     mlib_s32 src2_lb,mlib_blend src1dst_blend,
     mlib_blend src2_blend);

void mlib_VideoColorBlendABGR_ResetAlpha_Inp(mlib_u32 *src1dst,
     const mlib_u32 *src2, mlib_s32 src1dst_w,
     mlib_s32 src1dst_h, mlib_s32 src2_w,
     mlib_s32 src2_h, mlib_s32 src2_x,
     mlib_s32 src2_y, mlib_s32 src1dst_lb,
     mlib_s32 src2_lb, mlib_blend src1dst_blend,
     mlib_blend src2_blend);

Description

The functions use the following equation for blending images:

  src1dst = (src1dst * src1dst_blend) + (src2 * src2_blend)

The two multi-banded source images (src1dst and src2) are blended together and the result is stored in src1dst. src1dst_blend specifies the blend function to be applied to the src1dst image and src2_blend specifies the blend function to be applied to the src2 image. src2_x and src2_y specify position of src2 relative to the upper-left corner of src1dst. src2 is clipped to the boundaries of src1dst, if needed.

Possible blend functions are:

  MLIB_BLEND_ZERO
  MLIB_BLEND_ONE
  MLIB_BLEND_SRC_ALPHA
  MLIB_BLEND_ONE_MINUS_SRC_ALPHA
  MLIB_BLEND_DST_ALPHA
  MLIB_BLEND_ONE_MINUS_DST_ALPHA

MLIB_BLEND_DST_ALPHA is the alpha band of image src1 scaled to the range 0 to 1. MLIB_BLEND_SRC_ALPHA is the alpha band of image src2 scaled to the range 0 to 1. The output pixel bands are clamped to the range 0 to 255.

For the mlib_VideoColorBlendABGR_ResetAlpha_Inp() function, the alpha value of every pixel in destination image is set to 0 after blending is complete.

Parameters

Each of the functions takes the following arguments:

src1dst

Pointer to 1st input image (also dest. image).

src2

Pointer to 2nd input image.

src1dst_w

src1dst image width in pixels.

src1dst_h

src1dst image height in rows.

src2_w

src2 image width in pixels.

src2_h

src2 image height in rows.

src2_x

src2 horizontal displacement (in pixels), relative to the upper-left corner of src1dst.

src2_y

src2 vertical displacement (in rows), relative to the upper-left corner of src1dst.

src1dst_lb

Linebytes for src1dst image.

src2_lb

Linebytes for src2 image.

src1dst_blend

Blend function for src1dst image.

src2_blend

Blend function for src2 image.

Return Values

None.

Attributes

See attributes(5) for descriptions of the following attributes:

See Also

mlib_VideoColorBlendABGR(3MLIB), attributes(5)