image.h File Reference

(v16)

Image related functions. More...

#include "logging.h"

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Data Structures
struct	pixel
	A pixel storage structure. More...

Functions
int	cmp_pixel (const void *a, const void *b)
	Compare pixel iteration counts and error counts.
float *	image_get_glitched (int width, int height)
	Download image glitch flags from OpenGL.
float *	image_get_iterations (int width, int height)
	Download image iteration counts from OpenGL.
unsigned char *	image_erode (const unsigned char *data, int width, int height)
	Erode a binary image.
struct pixel *	image_find_peak_glitches (const float *glitched, const float *iterations, int width, int height, int *count)
	Find the highest iteration count glitched pixels.
enum result_t	image_result (int width, int height, double *iterations, double *exterior, double *interior, double *glitch)

Detailed Description

Image related functions.

Definition in file image.h.

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Data Structure Documentation

struct pixel

A pixel storage structure.

Definition at line 18 of file image.h.

Data Fields
float	e	Error count.
int	i	Pixel x coordinate.
int	j	Pixel y coordinate.
float	n	Iteration count.

Function Documentation

int cmp_pixel	(	const void *	a,
		const void *	b
	)

Compare pixel iteration counts and error counts.

For use in qsort(), larger iteration counts compare earlier, same iteration count has larger error count comparing earlier.

Parameters

a	The first pixel.
b	The second pixel.

Returns

Whether the first pixel is earlier than (-1), equal to (0), or later than (1) the second pixel.

Definition at line 28 of file image.c.

References pixel::e, and pixel::n.

Referenced by image_find_peak_glitches().

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unsigned char* image_erode	(	const unsigned char *	data,
		int	width,
		int	height
	)

Erode a binary image.

See https://en.wikipedia.org/wiki/Erosion_%28morphology%29. The result should be free()d when no longer needed.

Parameters

data	The input image.
width	The image width.
height	The image height.

Returns

The eroded image.

Definition at line 103 of file image.c.

References pixel::i, and pixel::j.

struct pixel* image_find_peak_glitches ( const float *  glitched, const float *  iterations, int  width, int  height, int *  count  )

read

Find the highest iteration count glitched pixels.

The result should be free()d when no longer needed.

Parameters

glitched	The glitch count image.
iterations	The iteration count image.
width	The image width.
height	The image height.
count	The number of glitched pixels is stored here.

Returns

The glitched pixels sorted by error count, then by iteration count (highest first in both fields).

Definition at line 140 of file image.c.

References cmp_pixel(), pixel::e, pixel::i, pixel::j, and pixel::n.

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float* image_get_glitched	(	int	width,
		int	height
	)

Download image glitch flags from OpenGL.

Uses the currently bound texture, assumes glitch is in alpha. The result should be free()d when no longer needed.

Parameters

width	The width of the texture.
height	The height of the texture.

Returns

The glitch count image, tightly packed in rows from top left to bottom right.

Definition at line 49 of file image.c.

References pixel::i, pixel::j, and TEX_RAW.

Referenced by find_ref().

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float* image_get_iterations	(	int	width,
		int	height
	)

Download image iteration counts from OpenGL.

Uses the currently bound textures, assumes iteration count is in red. The result should be free()d when no longer needed.

Parameters

width	The width of the texture.
height	The height of the texture.

Returns

The iteration count image, tightly packed in rows from top left to bottom right.

Definition at line 76 of file image.c.

References pixel::i, pixel::j, and TEX_RAW.

enum result_t image_result	(	int	width,
		int	height,
		double *	iterations,
		double *	exterior,
		double *	interior,
		double *	glitch
	)

Definition at line 161 of file image.c.

References pixel::i, pixel::j, result_glitch, result_ok, and TEX_RAW.

Referenced by collect_metadata_to_string(), and render_display().

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