gvplugin_vt.c File Reference

Device that renders using ANSI terminal colors. More...

#include <assert.h>
#include <gvc/gvplugin.h>
#include <gvc/gvplugin_device.h>
#include <limits.h>
#include <stddef.h>
#include <gvc/gvio.h>

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Data Structures
struct	color_t
	an ANSI color More...

Macros
#define	GVPLUGIN_VT_API

Functions
static unsigned	distance (const color_t base, unsigned red, unsigned green, unsigned blue)
	a metric of “closeness” to a given color
static unsigned	get_color (unsigned red, unsigned green, unsigned blue)
	find closest ANSI color
static void	process (GVJ_t *job, int color_depth)
static void	process3 (GVJ_t *job)
static void	process24 (GVJ_t *job)
static unsigned	rgb_to_grayscale (unsigned red, unsigned green, unsigned blue)
	convert an RGB color to grayscale
static void	processNup (GVJ_t *job, unsigned y_stride, unsigned x_stride, const char **tiles)
static void	process4up (GVJ_t *job)
	draw a 4-pixels-per-character monochrome image
static void	process6up (GVJ_t *job)
	draw a 6-pixels-per-character monochrome image
static void	process8up (GVJ_t *job)
	draw a 8-pixels-per-character monochrome image

Variables
static const color_t	COLORS []
	ANSI 3-bit colors.
static const unsigned	BPP = 4
static gvdevice_engine_t	engine3
static gvdevice_engine_t	engine24
static gvdevice_engine_t	engine4up
static gvdevice_engine_t	engine6up
static gvdevice_engine_t	engine8up
static gvdevice_features_t	device_features
static gvplugin_installed_t	device_types []
static gvplugin_api_t	apis []
GVPLUGIN_VT_API gvplugin_library_t	gvplugin_vt_LTX_library = {"vt", apis}

Macro Definition Documentation

GVPLUGIN_VT_API

#define GVPLUGIN_VT_API

Definition at line 283 of file gvplugin_vt.c.

Function Documentation

distance()

static unsigned distance ( const color_t  base, unsigned  red, unsigned  green, unsigned  blue  )

static

Definition at line 34 of file gvplugin_vt.c.

References color_t::blue, color_t::green, and color_t::red.

Referenced by get_color().

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get_color()

static unsigned get_color ( unsigned  red, unsigned  green, unsigned  blue  )

static

Definition at line 44 of file gvplugin_vt.c.

References COLORS, distance(), and color_t::value.

Referenced by process().

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process()

static void process ( GVJ_t *  job, int  color_depth  )

static

Definition at line 60 of file gvplugin_vt.c.

References BPP, get_color(), gvprintf(), GVJ_s::height, GVJ_s::imagedata, offset, and GVJ_s::width.

Referenced by process24(), and process3().

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process24()

static void process24 ( GVJ_t *  job )

static

Definition at line 118 of file gvplugin_vt.c.

References process().

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process3()

static void process3 ( GVJ_t *  job )

static

Definition at line 116 of file gvplugin_vt.c.

References process().

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process4up()

static void process4up ( GVJ_t *  job )

static

Definition at line 189 of file gvplugin_vt.c.

References processNup().

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process6up()

static void process6up ( GVJ_t *  job )

static

Definition at line 200 of file gvplugin_vt.c.

References processNup().

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process8up()

static void process8up ( GVJ_t *  job )

static

Definition at line 215 of file gvplugin_vt.c.

References processNup().

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processNup()

static void processNup ( GVJ_t *  job, unsigned  y_stride, unsigned  x_stride, const char **  tiles  )

static

draw a y_stride×x_stride-pixels-per-character monochrome image

Parameters

job	GVC job to operate on
y_stride	How many Y pixels fit in a character
x_stride	How many X pixels fit in a character
tiles	In-order list of characters for each representation

Definition at line 141 of file gvplugin_vt.c.

References BPP, gvputc(), gvputs(), GVJ_s::height, GVJ_s::imagedata, NULL, offset, rgb_to_grayscale(), and GVJ_s::width.

Referenced by process4up(), process6up(), and process8up().

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rgb_to_grayscale()

static unsigned rgb_to_grayscale ( unsigned  red, unsigned  green, unsigned  blue  )

static

use “perceptual” scaling, https://en.wikipedia.org/wiki/Grayscale#Colorimetric_(perceptual_luminance-preserving)_conversion_to_grayscale

Definition at line 121 of file gvplugin_vt.c.

Referenced by processNup().

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Variable Documentation

apis

gvplugin_api_t apis[]

static

Initial value:

= {
    {API_device, device_types},
    {(api_t)0, 0},
}

Definition at line 275 of file gvplugin_vt.c.

BPP

const unsigned BPP = 4

static

Definition at line 58 of file gvplugin_vt.c.

Referenced by process(), and processNup().

COLORS

const color_t COLORS[]

static

Initial value:

= {
    {0, 0x00, 0x00, 0x00}, 
    {1, 0xff, 0x00, 0x00}, 
    {2, 0x00, 0xff, 0x00}, 
    {3, 0xff, 0xff, 0x00}, 
    {4, 0x00, 0x00, 0xff}, 
    {5, 0xff, 0x00, 0xff}, 
    {6, 0x00, 0xff, 0xff}, 
    {7, 0xff, 0xff, 0xff}, 
}

Definition at line 22 of file gvplugin_vt.c.

Referenced by get_color().

device_features

gvdevice_features_t device_features

static

Initial value:

= {
    .default_dpi = {96, 96},
}

Definition at line 262 of file gvplugin_vt.c.

device_types

gvplugin_installed_t device_types[]

static

Initial value:

= {
    {8, "vt:cairo", 0, &engine3, &device_features},
    {1 << 24, "vt-24bit:cairo", 0, &engine24, &device_features},
    {4, "vt-4up:cairo", 0, &engine4up, &device_features},
    {6, "vt-6up:cairo", 0, &engine6up, &device_features},
    {7, "vt-8up:cairo", 0, &engine8up, &device_features},
    {0},
}

Definition at line 266 of file gvplugin_vt.c.

engine24

gvdevice_engine_t engine24

static

Initial value:

= {
    .format = process24,
}

Definition at line 246 of file gvplugin_vt.c.

engine3

gvdevice_engine_t engine3

static

Initial value:

= {
    .format = process3,
}

Definition at line 242 of file gvplugin_vt.c.

engine4up

gvdevice_engine_t engine4up

static

Initial value:

= {
    .format = process4up,
}

Definition at line 250 of file gvplugin_vt.c.

engine6up

gvdevice_engine_t engine6up

static

Initial value:

= {
    .format = process6up,
}

Definition at line 254 of file gvplugin_vt.c.

engine8up

gvdevice_engine_t engine8up

static

Initial value:

= {
    .format = process8up,
}

Definition at line 258 of file gvplugin_vt.c.

gvplugin_vt_LTX_library

GVPLUGIN_VT_API gvplugin_library_t gvplugin_vt_LTX_library = {"vt", apis}

Definition at line 286 of file gvplugin_vt.c.