General Utilities

Some functions that are handy but are not specific of canvas or objects. More...

Functions
EAPI const char *	evas_load_error_str (int error)
	Converts the given error code into a string describing it in english.
EAPI void	evas_color_hsv_to_rgb (float h, float s, float v, int *r, int *g, int *b)
	Convert a given color from HSV to RGB format.
EAPI void	evas_color_rgb_to_hsv (int r, int g, int b, float *h, float *s, float *v)
	Convert a given color from RGB to HSV format.
EAPI void	evas_color_argb_premul (int a, int *r, int *g, int *b)
	Pre-multiplies a rgb triplet by an alpha factor.
EAPI void	evas_color_argb_unpremul (int a, int *r, int *g, int *b)
	Undo pre-multiplication of a rgb triplet by an alpha factor.
EAPI void	evas_data_argb_premul (unsigned int *data, unsigned int len)
	Pre-multiplies data by an alpha factor.
EAPI void	evas_data_argb_unpremul (unsigned int *data, unsigned int len)
	Undo pre-multiplication data by an alpha factor.
EAPI int	evas_string_char_next_get (const char *str, int pos, int *decoded)
	To be documented.
EAPI int	evas_string_char_prev_get (const char *str, int pos, int *decoded)
	To be documented.
EAPI int	evas_string_char_len_get (const char *str)
	Get the length in characters of the string.
EAPI void	evas_transform_identity_set (Evas_Transform *t)
	To be documented.
EAPI void	evas_transform_rotate (double angle, Evas_Transform *t)
	To be documented.
EAPI void	evas_transform_translate (float dx, float dy, Evas_Transform *t)
	To be documented.
EAPI void	evas_transform_scale (float sx, float sy, Evas_Transform *t)
	To be documented.
EAPI void	evas_transform_shear (float sh, float sv, Evas_Transform *t)
	To be documented.
EAPI void	evas_transform_compose (Evas_Transform *l, Evas_Transform *t)
	To be documented.

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Detailed Description

Some functions that are handy but are not specific of canvas or objects.

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Function Documentation

EAPI void evas_color_argb_premul	(	int	a,
		int *	r,
		int *	g,
		int *	b
	)

Pre-multiplies a rgb triplet by an alpha factor.

Parameters:

a	The alpha factor.
r	The Red component of the color.
g	The Green component of the color.
b	The Blue component of the color.

This function pre-multiplies a given rbg triplet by an alpha factor. Alpha factor is used to define transparency.

EAPI void evas_color_argb_unpremul	(	int	a,
		int *	r,
		int *	g,
		int *	b
	)

Undo pre-multiplication of a rgb triplet by an alpha factor.

Parameters:

a	The alpha factor.
r	The Red component of the color.
g	The Green component of the color.
b	The Blue component of the color.

This function undoes pre-multiplication a given rbg triplet by an alpha factor. Alpha factor is used to define transparency.

See also:

evas_color_argb_premul().

EAPI void evas_color_hsv_to_rgb	(	float	h,
		float	s,
		float	v,
		int *	r,
		int *	g,
		int *	b
	)

Convert a given color from HSV to RGB format.

Parameters:

h	The Hue component of the color.
s	The Saturation component of the color.
v	The Value component of the color.
r	The Red component of the color.
g	The Green component of the color.
b	The Blue component of the color.

This function converts a given color in HSV color format to RGB color format.

EAPI void evas_color_rgb_to_hsv	(	int	r,
		int	g,
		int	b,
		float *	h,
		float *	s,
		float *	v
	)

Convert a given color from RGB to HSV format.

Parameters:

r	The Red component of the color.
g	The Green component of the color.
b	The Blue component of the color.
h	The Hue component of the color.
s	The Saturation component of the color.
v	The Value component of the color.

This function converts a given color in RGB color format to HSV color format.

EAPI void evas_data_argb_premul	(	unsigned int *	data,
		unsigned int	len
	)

Pre-multiplies data by an alpha factor.

Parameters:

data	The data value.
len	The lenght value.

This function pre-multiplies a given data by an alpha factor. Alpha factor is used to define transparency.

EAPI void evas_data_argb_unpremul	(	unsigned int *	data,
		unsigned int	len
	)

Undo pre-multiplication data by an alpha factor.

Parameters:

data	The data value.
len	The lenght value.

This function undoes pre-multiplication of a given data by an alpha factor. Alpha factor is used to define transparency.

EAPI const char* evas_load_error_str

(

int

error

)

Converts the given error code into a string describing it in english.

Parameters:

error

the error code.

Returns:

Always return a valid string. If given error is not supported "Unknown error" is returned.

References EVAS_LOAD_ERROR_CORRUPT_FILE, EVAS_LOAD_ERROR_DOES_NOT_EXIST, EVAS_LOAD_ERROR_GENERIC, EVAS_LOAD_ERROR_NONE, EVAS_LOAD_ERROR_PERMISSION_DENIED, EVAS_LOAD_ERROR_RESOURCE_ALLOCATION_FAILED, and EVAS_LOAD_ERROR_UNKNOWN_FORMAT.

EAPI int evas_string_char_len_get

(

const char *

str

)

Get the length in characters of the string.

Parameters:

str	The string to get the length of.

Returns:

The length in characters (not bytes)

EAPI int evas_string_char_next_get	(	const char *	str,
		int	pos,
		int *	decoded
	)

To be documented.

FIXME: To be fixed.

EAPI int evas_string_char_prev_get	(	const char *	str,
		int	pos,
		int *	decoded
	)

To be documented.

FIXME: To be fixed.

EAPI void evas_transform_compose	(	Evas_Transform *	l,
		Evas_Transform *	t
	)

To be documented.

FIXME: To be fixed.

EAPI void evas_transform_identity_set

(

Evas_Transform *

t

)

To be documented.

FIXME: To be fixed.

EAPI void evas_transform_rotate	(	double	angle,
		Evas_Transform *	t
	)

To be documented.

FIXME: To be fixed.

EAPI void evas_transform_scale	(	float	sx,
		float	sy,
		Evas_Transform *	t
	)

To be documented.

FIXME: To be fixed.

EAPI void evas_transform_shear	(	float	sh,
		float	sv,
		Evas_Transform *	t
	)

To be documented.

FIXME: To be fixed.

EAPI void evas_transform_translate	(	float	dx,
		float	dy,
		Evas_Transform *	t
	)

To be documented.

FIXME: To be fixed.