Padding

Set the padding around an image. More...

int	rapp_pad_align_u8 (uint8_t *buf, int dim, int width, int height, int value)
	Sets the alignment pixels to value.
int	rapp_pad_const_u8 (uint8_t *buf, int dim, int width, int height, int size, int value)
	Pad an 8-bit image with a constant value.
int	rapp_pad_clamp_u8 (uint8_t *buf, int dim, int width, int height, int size)
	Pad an 8-bit image by clamping the edge value.
int	rapp_pad_align_bin (uint8_t *buf, int dim, int off, int width, int height, int value)
	Sets the alignment pixels to value.
int	rapp_pad_const_bin (uint8_t *buf, int dim, int off, int width, int height, int size, int set)
	Pad a binary image with a constant value.
int	rapp_pad_clamp_bin (uint8_t *buf, int dim, int off, int width, int height, int size)
	Pad a binary image by clamping the edge value.

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Detailed Description

Set the padding around an image.

The functions that accept a size in pixels of the padding will set exactly this number of pixels in the top and bottom padding, but may set left and right padding pixels up to the nearest alignment boundaries.

The images may be misaligned.

Next section: Geometrical Transformations

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Function Documentation

int rapp_pad_align_u8	(	uint8_t *	buf,
		int	dim,
		int	width,
		int	height,
		int	value
	)

Sets the alignment pixels to value.

The alignment pixels consists of the pixels to the left and right of the actual image area, up to the nearest alignment boundary.

Parameters:

[in,out]	buf	Pixel buffer, possibly misaligned.
	dim	Row dimension of the buffer.
	width	Image width in pixels.
	height	Image height in pixels.
	value	The value, in the range 0-255.

Returns:

A negative error code on error, zero otherwise.

int rapp_pad_align_bin	(	uint8_t *	buf,
		int	dim,
		int	off,
		int	width,
		int	height,
		int	value
	)

Sets the alignment pixels to value.

The alignment pixels consists of the pixels to the left (including the binary offset) and right of the actual image area, up to the nearest alignment boundary.

Parameters:

[in,out]	buf	Pixel buffer, possibly misaligned.
	dim	Row dimension of the buffer.
	off	Bit offset of the buffer, in the range 0-7.
	width	Image width in pixels.
	height	Image height in pixels.
	value	The boolean value to set.

Returns:

A negative error code on error, zero otherwise.

int rapp_pad_const_u8	(	uint8_t *	buf,
		int	dim,
		int	width,
		int	height,
		int	size,
		int	value
	)

Pad an 8-bit image with a constant value.

Parameters:

[in,out]	buf	Pixel buffer, possibly misaligned.
	dim	Row dimension of the buffer.
	width	Image width in pixels.
	height	Image height in pixels.
	size	Size of the padding in pixels.
	value	Padding value, in the range 0-255.

Returns:

A negative error code on error, zero otherwise.

int rapp_pad_clamp_u8	(	uint8_t *	buf,
		int	dim,
		int	width,
		int	height,
		int	size
	)

Pad an 8-bit image by clamping the edge value.

Parameters:

[in,out]	buf	Pixel buffer, possibly misaligned.
	dim	Row dimension of the buffer.
	width	Image width in pixels.
	height	Image height in pixels.
	size	Size of the padding in pixels.

Returns:

A negative error code on error, zero otherwise.

int rapp_pad_const_bin	(	uint8_t *	buf,
		int	dim,
		int	off,
		int	width,
		int	height,
		int	size,
		int	set
	)

Pad a binary image with a constant value.

Parameters:

[in,out]	buf	Pixel buffer, possibly misaligned.
	dim	Row dimension of the buffer.
	off	Bit offset of the buffer, in the range 0-7.
	width	Image width in pixels.
	height	Image height in pixels.
	size	Size of the padding in pixels.
	set	The boolean value to set.

Returns:

A negative error code on error, zero otherwise.

int rapp_pad_clamp_bin	(	uint8_t *	buf,
		int	dim,
		int	off,
		int	width,
		int	height,
		int	size
	)

Pad a binary image by clamping the edge value.

Parameters:

[in,out]	buf	Pixel buffer, possibly misaligned.
	dim	Row dimension of the buffer.
	off	Bit offset of the buffer, in the range 0-7.
	width	Image width in pixels.
	height	Image height in pixels.
	size	Size of the padding in pixels.

Returns:

A negative error code on error, zero otherwise.