Collaboration diagram for Color:

Data Structures
struct	GF_VideoSurface
	Video framebuffer object. More...

struct	GF_Window
	Video Window object. More...

struct	GF_ColorMatrix
	color matrix object More...

struct	GF_ColorKey
	Color Key descriptor. More...

Macros
#define	GF_COL_ARGB(a, r, g, b)

#define	GF_COL_ARGB_FIXED(_a, _r, _g, _b)

#define	GF_COL_A(c)

#define	GF_COL_R(c)

#define	GF_COL_G(c)

#define	GF_COL_B(c)

#define	GF_COL_565(r, g, b)

#define	GF_COL_555(r, g, b)

#define	GF_COLW_A(c)

#define	GF_COLW_R(c)

#define	GF_COLW_G(c)

#define	GF_COLW_B(c)

Typedefs
typedef u32	GF_Color
	ARGB color object. More...

Functions
GF_Color	gf_color_parse (const char *name)

const char *	gf_color_get_name (GF_Color col)

Bool	gf_color_enum (u32 idx, GF_Color color, const char **color_name)

void	gf_cmx_init (GF_ColorMatrix *_this)

void	gf_cmx_set (GF_ColorMatrix *_this, Fixed mrr, Fixed mrg, Fixed mrb, Fixed mra, Fixed tr, Fixed mgr, Fixed mgg, Fixed mgb, Fixed mga, Fixed tg, Fixed mbr, Fixed mbg, Fixed mbb, Fixed mba, Fixed tb, Fixed mar, Fixed mag, Fixed mab, Fixed maa, Fixed ta)

void	gf_cmx_copy (GF_ColorMatrix _this, GF_ColorMatrix from)

void	gf_cmx_multiply (GF_ColorMatrix _this, GF_ColorMatrix with)
	color matrix multiplication More...

GF_Color	gf_cmx_apply (GF_ColorMatrix *_this, GF_Color col)
	color matrix transform More...

void	gf_cmx_apply_argb (GF_ColorMatrix _this, u8 a, u8 r, u8 g, u8 *b)
	color matrix transform More...

u64	gf_cmx_apply_wide (GF_ColorMatrix *_this, u64 col)
	color matrix transform on wide pixel (16 bit per component) More...

void	gf_cmx_apply_fixed (GF_ColorMatrix _this, Fixed a, Fixed r, Fixed g, Fixed *b)
	color components matrix transform More...

GF_Err	gf_stretch_bits (GF_VideoSurface dst, GF_VideoSurface src, GF_Window dst_wnd, GF_Window src_wnd, u8 alpha, Bool flip, GF_ColorKey colorKey, GF_ColorMatrix cmat)
	stretches two video surfaces More...

Detailed Description

This section documents color tools for image processing and color conversion

Data Structure Documentation

◆ GF_VideoSurface

struct GF_VideoSurface

The video framebuffer object represents uncompressed color data like images in a variety of formats. Data in the video framebuffer MUST be continuous.

Data Fields
u32	width	Width of the video framebuffer
u32	height	Height of the video framebuffer
s32	pitch_x	Horizontal pitch of the video framebuffer (number of bytes to skip to go to next (right) pixel in the buffer). May be negative for some framebuffers (embedded devices). 0 means linear frame buffer (pitch_x==bytes per pixel)
s32	pitch_y	Vertical pitch of the video framebuffer (number of bytes to skip to go down one line in the buffer). May be negative for some framebuffers (embedded devices)
u32	pixel_format	Pixel format of the video framebuffer
u8 *	video_buffer	pointer to the beginning of the video memory (top-left corner)
Bool	is_hardware_memory	indicates that the video data reside on systems memory or video card one
u8 *	u_ptr	indicates U and V (and optional alpha) buffers in case of planar video with separated component. If not set, all components are in the video_buffer pointer
u8 *	v_ptr
u8 *	a_ptr
u8	global_alpha	alpha value for this surface

◆ GF_Window

struct GF_Window

The video window object represents a rectangle in framebuffer coordinate system

Data Fields
u32	x	left-most coordinate of the rectangle
u32	y	top-most coordinate of the rectangle
u32	w	width of the rectangle
u32	h	height of the rectangle

◆ GF_ColorMatrix

struct GF_ColorMatrix

The Color transformation matrix object allows complete color space transformation (shift, rotate, skew, add).
The matrix coefs are in rgba order, hence the color RGBA is transformed to:

R'              m0      m1      m2      m3      m4                      R
G'              m5      m6      m7      m8      m9                      G
B'      =       m10     m11     m12     m13     m14             x       B
A'              m15     m16     m17     m18     m19                     A
0               0       0       0       0       1                       0

Coeficients are in intensity scale, ranging from 0 to FIX_ONE.

Data Fields
Fixed	m[20]	color matrix coefficient
u32	identity	internal flag to speed up things when matrix is identity. This is a read only flag, do not modify it

◆ GF_ColorKey

struct GF_ColorKey

The ColorKey object represents a ColorKey with low and high threshold keying

Data Fields
u8	r	color key R, G, and B components
u8	g
u8	b
u8	alpha	Alpha value for opaque (non-keyed) pixels
u8	low	low variance threshold
u8	high	high variance threshold

Macro Definition Documentation

◆ GF_COL_ARGB

#define GF_COL_ARGB	(	a,
		r,
		g,
		b
	)

color formatting macro from alpha, red, green and blue components expressed as integers ranging from 0 to 255

◆ GF_COL_ARGB_FIXED

#define GF_COL_ARGB_FIXED	(	_a,
		_r,
		_g,
		_b
	)

color formatting macro from alpha, red, green and blue components expressed as fixed numbers ranging from 0 to FIX_ONE

◆ GF_COL_A

#define GF_COL_A ( c )

gets alpha component of a color

◆ GF_COL_R

#define GF_COL_R ( c )

gets red component of a color

◆ GF_COL_G

#define GF_COL_G ( c )

gets green component of a color

◆ GF_COL_B

#define GF_COL_B ( c )

gets blue component of a color

◆ GF_COL_565

#define GF_COL_565	(	r,
		g,
		b
	)

16-bits color formatting macro from red, green and blue components

◆ GF_COL_555

#define GF_COL_555	(	r,
		g,
		b
	)

15-bits color formatting macro from red, green and blue components

◆ GF_COLW_A

#define GF_COLW_A ( c )

gets alpha component of a wide color

◆ GF_COLW_R

#define GF_COLW_R ( c )

gets red component of a wide color

◆ GF_COLW_G

#define GF_COLW_G ( c )

gets green component of a wide color

◆ GF_COLW_B

#define GF_COLW_B ( c )

gets blue component of a wide color

Typedef Documentation

◆ GF_Color

typedef u32 GF_Color

The color type used in the GPAC framework represents colors in the form 0xAARRGGBB, with each component ranging from 0 to 255

Function Documentation

◆ gf_color_parse()

GF_Color gf_color_parse ( const char * name )

Parses color from HTML name or hexa representation

Parameters

name	name of the color to parse

Returns: GF_Color value with alpha set to 0xFF if successful, 0 otherwise

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◆ gf_color_get_name()

const char* gf_color_get_name ( GF_Color col )

Gets color from HTML name or hexa representation

Parameters

col	color to identify

Returns: name of the color if successful, NULL otherwise

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◆ gf_color_enum()

Bool gf_color_enum	(	u32 *	idx,
		GF_Color *	color,
		const char **	color_name
	)

Enumerates built-in colors

Parameters

idx	index of color to query, incremented by one on success
color	set to color value, can be NULL
color_name	set to color name, can be NULL

Returns: GF_TRUE if sucess, GF_FALSE otherwise

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◆ gf_cmx_init()

void gf_cmx_init ( GF_ColorMatrix * _this )

Inits a color matrix to identity

Parameters

_this the target color matrix to initialize

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◆ gf_cmx_set()

void gf_cmx_set	(	GF_ColorMatrix *	_this,
		Fixed	mrr,
		Fixed	mrg,
		Fixed	mrb,
		Fixed	mra,
		Fixed	tr,
		Fixed	mgr,
		Fixed	mgg,
		Fixed	mgb,
		Fixed	mga,
		Fixed	tg,
		Fixed	mbr,
		Fixed	mbg,
		Fixed	mbb,
		Fixed	mba,
		Fixed	tb,
		Fixed	mar,
		Fixed	mag,
		Fixed	mab,
		Fixed	maa,
		Fixed	ta
	)

Inits all coefficients of a color matrix

Parameters

_this	color matrix to initialize
mrr	red-to-red multiplication factor
mrg	red-to-green multiplication factor
mrb	red-to-blue multiplication factor
mra	red-to-alpha multiplication factor
tr	red translation factor
mgr	green-to-red multiplication factor
mgg	green-to-green multiplication factor
mgb	green-to-blue multiplication factor
mga	green-to-alpha multiplication factor
tg	green translation factor
mbr	blue-to-red multiplication factor
mbg	blue-to-green multiplication factor
mbb	blue-to-blue multiplication factor
mba	blue-to-alpha multiplication factor
tb	blue translation factor
mar	alpha-to-red multiplication factor
mag	alpha-to-green multiplication factor
mab	alpha-to-blue multiplication factor
maa	alpha-to-alpha multiplication factor
ta	alpha translation factor

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◆ gf_cmx_copy()

void gf_cmx_copy	(	GF_ColorMatrix *	_this,
		GF_ColorMatrix *	from
	)

Inits a matrix from another matrix

Parameters

_this	color matrix to initialize
from	color matrix to copy from

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◆ gf_cmx_multiply()

void gf_cmx_multiply	(	GF_ColorMatrix *	_this,
		GF_ColorMatrix *	with
	)

Multiplies a color matrix by another one. Result is _this*with

Parameters

_this	color matrix to transform. Once the function called, _this will contain the resulting color matrix
with	color matrix to add

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◆ gf_cmx_apply()

GF_Color gf_cmx_apply	(	GF_ColorMatrix *	_this,
		GF_Color	col
	)

Transforms a color with a given color matrix

Parameters

_this	color matrix to use.
col	color to transform

Returns: transformed color

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◆ gf_cmx_apply_argb()

void gf_cmx_apply_argb	(	GF_ColorMatrix *	_this,
		u8 *	a,
		u8 *	r,
		u8 *	g,
		u8 *	b
	)

Transforms a color with a given color matrix

Parameters

_this	color matrix to use.
a	alpha to transform (in/out)
r	red to transform (in/out)
g	green to transform (in/out)
b	blue to transform (in/out)

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◆ gf_cmx_apply_wide()

u64 gf_cmx_apply_wide	(	GF_ColorMatrix *	_this,
		u64	col
	)

Transforms a color with a given color matrix

Parameters

_this	color matrix to use.
col	color to transform

Returns: transformed color

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◆ gf_cmx_apply_fixed()

void gf_cmx_apply_fixed	(	GF_ColorMatrix *	_this,
		Fixed *	a,
		Fixed *	r,
		Fixed *	g,
		Fixed *	b
	)

Transforms color components with a given color matrix

Parameters

_this	color matrix to use.
a	pointer to alpha component. Once the function is called, a contains the transformed alpha component
r	pointer to red component. Once the function is called, r contains the transformed red component
g	pointer to green component. Once the function is called, g contains the transformed green component
b	pointer to blue component. Once the function is called, b contains the transformed blue component

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◆ gf_stretch_bits()

GF_Err gf_stretch_bits	(	GF_VideoSurface *	dst,
		GF_VideoSurface *	src,
		GF_Window *	dst_wnd,
		GF_Window *	src_wnd,
		u8	alpha,
		Bool	flip,
		GF_ColorKey *	colorKey,
		GF_ColorMatrix *	cmat
	)

Software stretch of source surface onto destination surface.

Parameters

dst	destination surface
src	source surface
dst_wnd	destination rectangle. If null the entire destination surface is used
src_wnd	source rectangle. If null the entire source surface is used
alpha	blend factor of source over alpha
flip	flips the source
colorKey	makes source pixel matching the color key transparent
cmat	applies color matrix to the source

Returns: error code if any

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Data Structures

Macros

Typedefs

Functions

Detailed Description

Data Structure Documentation

◆ GF_VideoSurface

◆ GF_Window

◆ GF_ColorMatrix

◆ GF_ColorKey

Macro Definition Documentation

◆ GF_COL_ARGB

◆ GF_COL_ARGB_FIXED

◆ GF_COL_A

◆ GF_COL_R

◆ GF_COL_G

◆ GF_COL_B

◆ GF_COL_565

◆ GF_COL_555

◆ GF_COLW_A

◆ GF_COLW_R

◆ GF_COLW_G

◆ GF_COLW_B

Typedef Documentation

◆ GF_Color

Function Documentation

◆ gf_color_parse()

◆ gf_color_get_name()

◆ gf_color_enum()

◆ gf_cmx_init()

◆ gf_cmx_set()

◆ gf_cmx_copy()

◆ gf_cmx_multiply()

◆ gf_cmx_apply()

◆ gf_cmx_apply_argb()

◆ gf_cmx_apply_wide()

◆ gf_cmx_apply_fixed()

◆ gf_stretch_bits()