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elinks/src/terminal/screen.c
Witold Filipczyk c086cbe26e [color] Removed code related to draw_text_node 
This idea failed. Code was slow.
2022-10-16 15:18:34 +02:00

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/** Terminal screen drawing routines.
* @file */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdlib.h>
#include <string.h>
#include "elinks.h"
#include "config/options.h"
#include "intl/charsets.h"
#include "main/module.h"
#include "osdep/ascii.h"
#include "osdep/osdep.h"
#include "terminal/color.h"
#include "terminal/draw.h"
#include "terminal/hardio.h"
#include "terminal/kbd.h"
#include "terminal/screen.h"
#include "terminal/terminal.h"
#ifdef CONFIG_TERMINFO
#include "terminal/terminfo.h"
#endif
#include "util/conv.h"
#include "util/error.h"
#include "util/memory.h"
#include "util/string.h"
/* TODO: We must use termcap/terminfo if available! --pasky
* Please mention ELinks bug 96 in commit logs. --KON */
/** Mapping from (enum ::border_char - 0xB0) to ASCII characters. */
const unsigned char frame_dumb[48] = {
' ',' ',' ','|','|','|','|','+',
'+','|','|','+','+','+','+','+',
'+','-','-','|','-','+','|','|',
'+','+','-','-','|','-','+','-',
'-','-','-','+','+','+','+','+',
'+','+','+',' ',' ',' ',' ',' '
};
/** Mapping from (enum ::border_char - 0xB0) to VT100 line-drawing
* characters. */
static const unsigned char frame_vt100[48] = {
'a','a','a','x','u','u','u','k',
'k','u','x','k','j','j','j','k',
'm','v','w','t','q','n','t','t',
'm','l','v','w','t','q','n','v',
'v','w','w','m','m','l','l','n',
'n','j','l','a',' ',' ',' ',' '
};
/** Mapping from (enum ::border_char - 0xB0) to VT100 line-drawing
* characters encoded in CP437.
* When UTF-8 I/O is enabled, ELinks uses this array instead of
* ::frame_vt100[], and converts the characters from CP437 to UTF-8. */
static const unsigned char frame_vt100_u[48] = {
177, 177, 177, 179, 180, 180, 180, 191,
191, 180, 179, 191, 217, 217, 217, 191,
192, 193, 194, 195, 196, 197, 195, 195,
192, 218, 193, 194, 195, 196, 197, 193,
193, 194, 194, 192, 192, 218, 218, 197,
197, 217, 218, 177, 32, 32, 32, 32
};
/** Mapping from (enum ::border_char - 0xB0) to obsolete FreeBSD ACS
* graphics.
*
* This is for FreeBSD fonts that place graphics characters in the
* 0x80...0x9F range, which ISO 8859 does not use. The characters are
* supposed to be sorted according to the codes used in VT100 or in
* the terminfo "acsc" capability:
*
* @verbatim
* 0x80 U+2588 '0' ACS_BLOCK
* 0x81 U+25C6 '`' ACS_DIAMOND
* 0x82 U+2592 'a' ACS_CKBOARD
* 0x83 U+2409 'b' -
* 0x84 U+240C 'c' -
* 0x85 U+240D 'd' -
* 0x86 U+240A 'e' -
* 0x87 U+00B0 'f' ACS_DEGREE
* 0x88 U+00B1 'g' ACS_PLMINUS
* 0x89 U+2424 'h' -
* 0x8A U+240B 'i' -
* 0x8B U+2518 'j' ACS_LRCORNER
* 0x8C U+2510 'k' ACS_URCORNER
* 0x8D U+250C 'l' ACS_ULCORNER
* 0x8E U+2514 'm' ACS_LLCORNER
* 0x8F U+253C 'n' ACS_PLUS
* 0x90 U+23BA 'o' ACS_S1
* 0x91 U+23BB 'p' ACS_S3
* 0x92 U+2500 'q' ACS_HLINE
* 0x93 U+23BC 'r' ACS_S7
* 0x94 U+23BD 's' ACS_S9
* 0x95 U+251C 't' ACS_LTEE
* 0x96 U+2524 'u' ACS_RTEE
* 0x97 U+2534 'v' ACS_BTEE
* 0x98 U+252C 'w' ACS_TTEE
* 0x99 U+2502 'x' ACS_VLINE
* 0x9A U+2264 'y' ACS_LEQUAL
* 0x9B U+2265 'z' ACS_GEQUAL
* 0x9C U+03C0 '{' ACS_PI
* 0x9D U+2260 '|' ACS_NEQUAL
* 0x9E U+00A3 '}' ACS_STERLING
* 0x9F U+00B7 '~' ACS_BULLET
* @endverbatim
*
* (Ncurses 5.5 defines ACS_BOARD using 'h' and ACS_LANTERN using 'i',
* but those are not the characters meant above.)
*
* In FreeBSD CVS, src/share/syscons/fonts/iso-8x16.fnt revision 1.1
* includes these characters, except it has a space at 0x80. In
* revision 1.2 however, all the characters not defined by ISO 8859-1
* have been blanked out. This change was made on 2001-11-22 and
* included in FreeBSD 4.6.0, which was then released in June 2002.
* Yet, support for these characters was added to Links on 2003-11-18
* and to ELinks on 2003-12-07, so perhaps we should keep it for now. */
static const unsigned char frame_freebsd[48] = {
130, 138, 128, 153, 150, 150, 150, 140,
140, 150, 153, 140, 139, 139, 139, 140,
142, 151, 152, 149, 146, 143, 149, 149,
142, 141, 151, 152, 149, 146, 143, 151,
151, 152, 152, 142, 142, 141, 141, 143,
143, 139, 141, 128, 128, 128, 128, 128,
};
/** Mapping from (enum ::border_char - 0xB0) to obsolete FreeBSD ACS
* graphics encoded in CP437.
* When UTF-8 I/O is enabled, ELinks uses this array instead of
* ::frame_freebsd[], and converts the characters from CP437 to UTF-8.
*
* Derived from ::frame_freebsd[] by converting the characters to
* Unicode and back to CP437. frame_freebsd[1] = 138 = 0x8a = U+240B
* SYMBOL FOR VERTICAL TABULATION does not exist in CP437, so we
* substitute U+2592 MEDIUM SHADE. */
static const unsigned char frame_freebsd_u[48] = {
177, 177, 219, 179, 180, 180, 180, 191,
191, 180, 179, 191, 217, 217, 217, 191,
192, 193, 194, 195, 196, 197, 195, 195,
192, 218, 193, 194, 195, 196, 197, 193,
193, 194, 194, 192, 192, 218, 218, 197,
197, 217, 218, 219, 219, 219, 219, 219,
};
/** Mapping from (enum ::border_char - 0xB0) to KOI8-R. */
static const unsigned char frame_koi[48] = {
144, 145, 146, 129, 135, 178, 180, 167,
166, 181, 161, 168, 174, 173, 172, 131,
132, 137, 136, 134, 128, 138, 175, 176,
171, 165, 187, 184, 177, 160, 190, 185,
186, 182, 183, 170, 169, 162, 164, 189,
188, 133, 130, 141, 140, 142, 143, 139,
};
/** Mapping from (enum ::border_char - 0xB0) to CP850 or CP852. Most of
* this table is just 0xB0 + @<index in table>, because these codepages
* are quite similar to CP437. However, they lack some line-drawing
* characters, so we must use others instead. */
static const unsigned char frame_restrict[48] = {
176, 177, 178, 179, 180, 179, 186, 186,
205, 185, 186, 187, 188, 186, 205, 191,
192, 193, 194, 195, 196, 197, 179, 186,
200, 201, 202, 203, 204, 205, 206, 205,
196, 205, 196, 186, 205, 205, 186, 186,
179, 217, 218, 219, 220, 221, 222, 223,
};
#define TERM_STRING(str) INIT_STRING(str, sizeof(str) - 1)
/** Like add_string_to_string() but has fewer checks to slow it down. */
#define add_term_string(str, tstr) \
add_bytes_to_string(str, (tstr).source, (tstr).length)
/** Frame begin/end sequences that switch fonts with ECMA-48 SGR.
* ECMA-48: CSI Ps... 06/13 = SGR - SELECT GRAPHIC RENDITION
* - Ps = 10 = primary (default) font
* - Ps = 11 = first alternative font */
static const struct string m11_hack_frame_seqs[] = {
/* end border: */ TERM_STRING("\033[10m"),
/* begin border: */ TERM_STRING("\033[11m"),
};
/** Frame begin/end sequences for VT100. */
static const struct string vt100_frame_seqs[] = {
/* end border: */ TERM_STRING("\x0f"),
/* begin border: */ TERM_STRING("\x0e"),
};
/** Italic begin/end sequences using ECMA-48 SGR.
* ECMA-48: CSI Ps... 06/13 = SGR - SELECT GRAPHIC RENDITION
* - Ps = 3 = italicized
* - Ps = 20 = Fraktur (Gothic)
* - Ps = 23 = not italicized, not fraktur */
static const struct string italic_seqs[] = {
/* end italics: */ TERM_STRING("\033[23m"),
/* begin italics: */ TERM_STRING("\033[3m"),
};
/** Underline begin/end sequences using ECMA-48 SGR.
* ECMA-48: CSI Ps... 06/13 = SGR - SELECT GRAPHIC RENDITION
* - Ps = 4 = singly underlined
* - Ps = 21 = doubly underlined
* - Ps = 24 = not underlined (neither singly nor doubly) */
static const struct string underline_seqs[] = {
/* end underline: */ TERM_STRING("\033[24m"),
/* begin underline: */ TERM_STRING("\033[4m"),
};
/* elinks --dump has a separate implementation of color-changing
* sequences and does not use these. */
#if defined(CONFIG_88_COLORS) || defined(CONFIG_256_COLORS)
static const struct string color256_seqs[] = {
/* foreground: */ TERM_STRING("\033[0;38;5;%dm"),
/* background: */ TERM_STRING("\033[48;5;%dm"),
};
static const struct string fbterm_color256_seqs[] = {
/* foreground: */ TERM_STRING("\033[m\033[1;%d}"),
/* background: */ TERM_STRING("\033[2;%d}"),
};
#endif
struct screen_driver_opt {
/** Charsets when doing UTF-8 I/O.
* [0] is the common charset and [1] is the frame charset.
* Test whether to use UTF-8 I/O using the use_utf8_io() macro. */
int charsets[2];
/** The frame translation table. May be NULL. */
const unsigned char *frame;
/** The frame mode setup and teardown sequences. May be NULL. */
const struct string *frame_seqs;
/** The italic mode setup and teardown sequences. May be NULL. */
const struct string *italic;
/** The underline mode setup and teardown sequences. May be NULL. */
const struct string *underline;
/** The color mode */
color_mode_T color_mode;
#if defined(CONFIG_88_COLORS) || defined(CONFIG_256_COLORS)
const struct string *color256_seqs;
#endif
/** These are directly derived from the terminal options. */
unsigned int transparent:1;
#ifdef CONFIG_UTF8
/* Whether the charset of the terminal is UTF-8. This
* is the same as is_cp_utf8(charsets[0]), except the
* latter might crash if UTF-8 I/O is disabled. */
unsigned int utf8_cp:1;
#endif /* CONFIG_UTF8 */
#ifdef CONFIG_COMBINE
/* Whether the terminal supports combining characters. */
unsigned int combine:1;
#endif /* CONFIG_COMBINE */
#ifdef CONFIG_TERMINFO
/* Whether use terminfo. */
unsigned int terminfo:1;
#endif
};
/** Used in @c add_char*() and @c redraw_screen() to reduce the logic.
* It is updated from terminal._template_.* using option.change_hook.
*
* @todo TODO: termcap/terminfo can maybe gradually be introduced via
* this structure. We'll see. --jonas */
struct screen_driver {
LIST_HEAD(struct screen_driver);
/** The terminal._template_.type. Together with the #name member they
* uniquely identify the screen_driver. */
term_mode_type_T type;
/** set_screen_driver_opt() sets these. */
struct screen_driver_opt opt;
/* The terminal._template_ name. */
char name[1]; /* XXX: Keep last! */
};
/** Default options for ::TERM_DUMB. */
static const struct screen_driver_opt dumb_screen_driver_opt = {
/* charsets: */ { -1, -1 }, /* No UTF8 I/O */
/* frame: */ frame_dumb,
/* frame_seqs: */ NULL,
/* italic: */ italic_seqs,
/* underline: */ underline_seqs,
/* color_mode: */ COLOR_MODE_16,
#if defined(CONFIG_88_COLORS) || defined(CONFIG_256_COLORS)
/* color256_seqs: */ color256_seqs,
#endif
/* transparent: */ 1,
#ifdef CONFIG_UTF8
/* utf8_cp: */ 0,
#endif /* CONFIG_UTF8 */
#ifdef CONFIG_COMBINE
/* combine */ 0,
#endif /* CONFIG_COMBINE */
#ifdef CONFIG_TERMINFO
/* terminfo */ 0,
#endif
};
/** Default options for ::TERM_VT100. */
static const struct screen_driver_opt vt100_screen_driver_opt = {
/* charsets: */ { -1, -1 }, /* No UTF8 I/O */
/* frame: */ frame_vt100,
/* frame_seqs: */ vt100_frame_seqs,
/* italic: */ italic_seqs,
/* underline: */ underline_seqs,
/* color_mode: */ COLOR_MODE_16,
#if defined(CONFIG_88_COLORS) || defined(CONFIG_256_COLORS)
/* color256_seqs: */ color256_seqs,
#endif
/* transparent: */ 1,
#ifdef CONFIG_UTF8
/* utf8_cp: */ 0,
#endif /* CONFIG_UTF8 */
#ifdef CONFIG_COMBINE
/* combine */ 0,
#endif /* CONFIG_COMBINE */
#ifdef CONFIG_TERMINFO
/* terminfo */ 0,
#endif
};
/** Default options for ::TERM_LINUX. */
static const struct screen_driver_opt linux_screen_driver_opt = {
/* charsets: */ { -1, -1 }, /* No UTF8 I/O */
/* frame: */ NULL, /* No restrict_852 */
/* frame_seqs: */ NULL, /* No m11_hack */
/* italic: */ italic_seqs,
/* underline: */ underline_seqs,
/* color_mode: */ COLOR_MODE_16,
#if defined(CONFIG_88_COLORS) || defined(CONFIG_256_COLORS)
/* color256_seqs: */ color256_seqs,
#endif
/* transparent: */ 1,
#ifdef CONFIG_UTF8
/* utf8_cp: */ 0,
#endif /* CONFIG_UTF8 */
#ifdef CONFIG_COMBINE
/* combine */ 0,
#endif /* CONFIG_COMBINE */
#ifdef CONFIG_TERMINFO
/* terminfo */ 0,
#endif
};
/** Default options for ::TERM_KOI8. */
static const struct screen_driver_opt koi8_screen_driver_opt = {
/* charsets: */ { -1, -1 }, /* No UTF8 I/O */
/* frame: */ frame_koi,
/* frame_seqs: */ NULL,
/* italic: */ italic_seqs,
/* underline: */ underline_seqs,
/* color_mode: */ COLOR_MODE_16,
#if defined(CONFIG_88_COLORS) || defined(CONFIG_256_COLORS)
/* color256_seqs: */ color256_seqs,
#endif
/* transparent: */ 1,
#ifdef CONFIG_UTF8
/* utf8_cp: */ 0,
#endif /* CONFIG_UTF8 */
#ifdef CONFIG_COMBINE
/* combine */ 0,
#endif /* CONFIG_COMBINE */
#ifdef CONFIG_TERMINFO
/* terminfo */ 0,
#endif
};
/** Default options for ::TERM_FREEBSD. */
static const struct screen_driver_opt freebsd_screen_driver_opt = {
/* charsets: */ { -1, -1 }, /* No UTF8 I/O */
/* frame: */ frame_freebsd,
/* frame_seqs: */ NULL, /* No m11_hack */
/* italic: */ italic_seqs,
/* underline: */ underline_seqs,
/* color_mode: */ COLOR_MODE_16,
#if defined(CONFIG_88_COLORS) || defined(CONFIG_256_COLORS)
/* color256_seqs: */ color256_seqs,
#endif
/* transparent: */ 1,
#ifdef CONFIG_UTF8
/* utf8_cp: */ 0,
#endif /* CONFIG_UTF8 */
#ifdef CONFIG_COMBINE
/* combine */ 0,
#endif /* CONFIG_COMBINE */
#ifdef CONFIG_TERMINFO
/* terminfo */ 0,
#endif
};
/** Default options for ::TERM_FBTERM. */
static const struct screen_driver_opt fbterm_screen_driver_opt = {
/* charsets: */ { -1, -1 }, /* No UTF8 I/O */
/* frame: */ NULL,
/* frame_seqs: */ NULL, /* No m11_hack */
/* italic: */ italic_seqs,
/* underline: */ underline_seqs,
/* color_mode: */ COLOR_MODE_16,
#if defined(CONFIG_88_COLORS) || defined(CONFIG_256_COLORS)
/* color256_seqs: */ fbterm_color256_seqs,
#endif
/* transparent: */ 1,
#ifdef CONFIG_UTF8
/* utf8_cp: */ 0,
#endif /* CONFIG_UTF8 */
#ifdef CONFIG_COMBINE
/* combine */ 0,
#endif /* CONFIG_COMBINE */
#ifdef CONFIG_TERMINFO
/* terminfo */ 0,
#endif
};
/** Default options for all the different types of terminals.
* XXX: Keep in sync with term_mode_type_T. */
static const struct screen_driver_opt *const screen_driver_opts[] = {
/* TERM_DUMB: */ &dumb_screen_driver_opt,
/* TERM_VT100: */ &vt100_screen_driver_opt,
/* TERM_LINUX: */ &linux_screen_driver_opt,
/* TERM_KOI8: */ &koi8_screen_driver_opt,
/* TERM_FREEBSD: */ &freebsd_screen_driver_opt,
/* TERM_FBTERM: */ &fbterm_screen_driver_opt,
};
#define use_utf8_io(driver) ((driver)->opt.charsets[0] != -1)
static INIT_LIST_OF(struct screen_driver, active_screen_drivers);
/** Set screen_driver.opt according to screen_driver.type and @a term_spec.
* Other members of @a *driver need not have been initialized.
*
* If you modify anything here, check whether option descriptions
* should be updated. */
static void
set_screen_driver_opt(struct screen_driver *driver, struct option *term_spec)
{
const int cp = get_opt_codepage_tree(term_spec, "charset", NULL);
int utf8_io = get_opt_bool_tree(term_spec, "utf_8_io", NULL);
/* Copy all the original options from constants, so that this
* function need not carefully restore options one by one. */
copy_struct(&driver->opt, screen_driver_opts[driver->type]);
#ifdef CONFIG_COMBINE
driver->opt.combine = get_opt_bool_tree(term_spec, "combine", NULL);
#endif /* CONFIG_COMBINE */
#ifdef CONFIG_UTF8
/* Force UTF-8 I/O if the UTF-8 charset is selected. Various
* places assume that the terminal's charset is unibyte if
* UTF-8 I/O is disabled. (bug 827) */
if (is_cp_utf8(cp)) {
driver->opt.utf8_cp = 1;
utf8_io = 1;
} else {
driver->opt.utf8_cp = 0;
}
#endif /* CONFIG_UTF8 */
driver->opt.color_mode = get_opt_int_tree(term_spec, "colors", NULL);
driver->opt.transparent = get_opt_bool_tree(term_spec, "transparency",
NULL);
if (get_opt_bool_tree(term_spec, "italic", NULL)) {
driver->opt.italic = italic_seqs;
} else {
driver->opt.italic = NULL;
}
if (get_opt_bool_tree(term_spec, "underline", NULL)) {
driver->opt.underline = underline_seqs;
} else {
driver->opt.underline = NULL;
}
if (utf8_io) {
driver->opt.charsets[0] = cp;
/* When we're using UTF-8 I/O, we never need to switch
* charsets or fonts for drawing frames, because the
* characters encoded in UTF-8 are already unambiguous. */
driver->opt.frame_seqs = NULL;
if (driver->type == TERM_LINUX || driver->type == TERM_FBTERM) {
if (get_opt_bool_tree(term_spec, "restrict_852", NULL))
driver->opt.frame = frame_restrict;
driver->opt.charsets[1] = get_cp_index("cp437");
} else if (driver->type == TERM_FREEBSD) {
driver->opt.frame = frame_freebsd_u;
driver->opt.charsets[1] = get_cp_index("cp437");
} else if (driver->type == TERM_VT100) {
driver->opt.frame = frame_vt100_u;
driver->opt.charsets[1] = get_cp_index("cp437");
} else if (driver->type == TERM_KOI8) {
driver->opt.charsets[1] = get_cp_index("koi8-r");
} else {
#ifdef CONFIG_UTF8
/* Don't let driver->opt.charsets[1] become
* UTF-8, because it is passed to cp2u(),
* which supports only unibyte characters. */
if (driver->opt.utf8_cp)
driver->opt.charsets[1] = get_cp_index("US-ASCII");
else
#endif /* CONFIG_UTF8 */
driver->opt.charsets[1] = driver->opt.charsets[0];
}
} else { /* !utf8_io */
driver->opt.charsets[0] = -1;
if (driver->type == TERM_LINUX) {
if (get_opt_bool_tree(term_spec, "restrict_852", NULL))
driver->opt.frame = frame_restrict;
if (get_opt_bool_tree(term_spec, "m11_hack", NULL))
driver->opt.frame_seqs = m11_hack_frame_seqs;
} else if (driver->type == TERM_FREEBSD) {
if (get_opt_bool_tree(term_spec, "m11_hack", NULL))
driver->opt.frame_seqs = m11_hack_frame_seqs;
} else if (driver->type == TERM_VT100) {
driver->opt.frame = frame_vt100;
}
} /* !utf8_io */
#ifdef CONFIG_TERMINFO
driver->opt.terminfo = get_cmd_opt_bool("terminfo");
if (!driver->opt.terminfo) {
return;
}
#ifdef CONFIG_TRUE_COLOR
if (driver->opt.color_mode == COLOR_MODE_TRUE_COLOR) {
driver->opt.terminfo = 0;
return;
}
#endif
if (driver->opt.color_mode == COLOR_MODE_MONO) {
driver->opt.terminfo = 0;
return;
}
switch (terminfo_max_colors()) {
case 88:
#ifdef CONFIG_88_COLORS
driver->opt.color_mode = COLOR_MODE_88;
#else
driver->opt.color_mode = COLOR_MODE_16;
#endif
break;
case 256:
#ifdef CONFIG_256_COLORS
driver->opt.color_mode = COLOR_MODE_256;
#else
driver->opt.color_mode = COLOR_MODE_16;
#endif
break;
case 16:
case 8:
driver->opt.color_mode = COLOR_MODE_16;
break;
default:
driver->opt.color_mode = COLOR_MODE_MONO;
break;
}
#endif
}
static int
screen_driver_change_hook(struct session *ses, struct option *term_spec,
struct option *changed)
{
term_mode_type_T type = get_opt_int_tree(term_spec, "type", NULL);
struct screen_driver *driver;
const char *name = term_spec->name;
foreach (driver, active_screen_drivers)
if (driver->type == type && !strcmp(driver->name, name)) {
set_screen_driver_opt(driver, term_spec);
break;
}
return 0;
}
static inline struct screen_driver *
add_screen_driver(term_mode_type_T type, struct terminal *term, int env_len)
{
struct screen_driver *driver;
/* One byte is reserved for name in struct screen_driver. */
driver = (struct screen_driver *)mem_alloc(sizeof(*driver) + env_len);
if (!driver) return NULL;
/* These four operations fully initialize *driver. */
add_to_list(active_screen_drivers, driver);
driver->type = type;
set_screen_driver_opt(driver, term->spec);
memcpy(driver->name, term->spec->name, env_len + 1);
term->spec->change_hook = screen_driver_change_hook;
#ifdef CONFIG_UTF8
term->utf8_cp = driver->opt.utf8_cp;
term->utf8_io = use_utf8_io(driver);
#endif /* CONFIG_UTF8 */
return driver;
}
static inline struct screen_driver *
get_screen_driver(struct terminal *term)
{
term_mode_type_T type = get_opt_int_tree(term->spec, "type", NULL);
const char *name = term->spec->name;
int len = strlen(name);
struct screen_driver *driver;
foreach (driver, active_screen_drivers) {
if (driver->type != type) continue;
if (strcmp(driver->name, name)) continue;
/* Some simple probably useless MRU ;) */
move_to_top_of_list(active_screen_drivers, driver);
#ifdef CONFIG_UTF8
term->utf8_cp = driver->opt.utf8_cp;
term->utf8_io = use_utf8_io(driver);
#endif /* CONFIG_UTF8 */
return driver;
}
return add_screen_driver(type, term, len);
}
/** Release private screen drawing utilities. */
void
done_screen_drivers(struct module *xxx)
{
free_list(active_screen_drivers);
}
/** Adds the term code for positioning the cursor at @a x and @a y to
* @a string. The template term code is: "\033[<y>;<x>H" */
static inline struct string *
add_cursor_move_to_string(struct string *screen, int y, int x)
{
#ifdef CONFIG_TERMINFO
if (get_cmd_opt_bool("terminfo")) {
const char *aa = terminfo_cursor_address(y-1, x-1);
return add_to_string(screen, aa);
} else
#endif
#define CURSOR_NUM_LEN 10 /* 10 chars for @y and @x numbers should be more than enough. */
{ char code[4 + 2 * CURSOR_NUM_LEN + 1];
unsigned int length = 2;
code[0] = '\033';
code[1] = '[';
if (ulongcat(code, &length, y, CURSOR_NUM_LEN, 0) < 0)
return screen;
code[length++] = ';';
if (ulongcat(code, &length, x, CURSOR_NUM_LEN, 0) < 0)
return screen;
code[length++] = 'H';
return add_bytes_to_string(screen, code, length);
}
#undef CURSOR_NUM_LEN
}
struct screen_state {
unsigned char border;
unsigned char italic;
unsigned char underline;
unsigned char bold;
unsigned char attr;
/** Following should match the screen_char.color field. */
unsigned char color[SCREEN_COLOR_SIZE];
};
#if defined(CONFIG_TRUE_COLOR)
#define INIT_SCREEN_STATE { 0xFF, 0xFF, 0xFF, 0xFF, 0, { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF} }
#elif defined(CONFIG_88_COLORS) || defined(CONFIG_256_COLORS)
#define INIT_SCREEN_STATE { 0xFF, 0xFF, 0xFF, 0xFF, 0, { 0xFF, 0xFF } }
#else
#define INIT_SCREEN_STATE { 0xFF, 0xFF, 0xFF, 0xFF, 0, { 0xFF } }
#endif
#ifdef CONFIG_TRUE_COLOR
static inline int
compare_color_true(unsigned char *a, unsigned char *b)
{
return !memcmp(a, b, 6);
}
static inline int
compare_bg_color_true(unsigned char *a, unsigned char *b)
{
return (a[3] == b[3] && a[4] == b[4] && a[5] == b[5]);
}
static inline int
compare_fg_color_true(unsigned char *a, unsigned char *b)
{
return (a[0] == b[0] && a[1] == b[1] && a[2] == b[2]);
}
static inline void
copy_color_true(unsigned char *a, unsigned char *b)
{
memcpy(a, b, 6);
}
static inline int
background_is_black(unsigned char *a)
{
static unsigned char b[6] = {0, 0, 0, 0, 0, 0};
return compare_bg_color_true(a, b);
}
#endif
#if defined(CONFIG_88_COLORS) || defined(CONFIG_256_COLORS)
static inline int
compare_color_256(unsigned char *a, unsigned char *b)
{
return (a[0] == b[0] && a[1] == b[1]);
}
static inline int
compare_bg_color_256(unsigned char *a, unsigned char *b)
{
return (a[1] == b[1]);
}
static inline int
compare_fg_color_256(unsigned char *a, unsigned char *b)
{
return (a[0] == b[0]);
}
static inline void
copy_color_256(unsigned char *a, unsigned char *b)
{
a[0] = b[0];
a[1] = b[1];
}
#endif
static inline int
compare_color_16(unsigned char *a, unsigned char *b)
{
return (a[0] == b[0]);
}
static inline int
compare_bg_color_16(unsigned char *a, unsigned char *b)
{
return (TERM_COLOR_BACKGROUND_16(a) == TERM_COLOR_BACKGROUND_16(b));
}
static inline int
compare_fg_color_16(unsigned char *a, unsigned char *b)
{
return (TERM_COLOR_FOREGROUND_16(a) == TERM_COLOR_FOREGROUND_16(b));
}
static inline void
copy_color_16(unsigned char *a, unsigned char *b)
{
a[0] = b[0];
}
#ifdef CONFIG_UTF8
static inline void
add_char_data(struct string *screen, struct screen_driver *driver,
unicode_val_T data, unsigned char border)
#else /* !CONFIG_UTF8 */
static inline void
add_char_data(struct string *screen, struct screen_driver *driver,
unsigned char data, unsigned char border)
#endif /* !CONFIG_UTF8 */
{
/* charset use_utf8_io border data add_to_string
* ------- ----------- ------ ---------------- ----------------
* unibyte 0 0 terminal unibyte terminal unibyte
* unibyte 0 1 enum border_char border unibyte
* unibyte 1 0 terminal unibyte UTF-8
* unibyte 1 1 enum border_char UTF-8
* UTF-8 1 0 UTF-32 (*) UTF-8
* UTF-8 1 1 enum border_char UTF-8
*
* (*) For "UTF-32" above, data can also be UCS_NO_CHAR,
* in which case this function must not alter *screen.
*/
if (border && driver->opt.frame && data >= 176 && data < 224)
data = driver->opt.frame[data - 176];
#ifdef CONFIG_UTF8
if (driver->opt.utf8_cp) {
if (border) {
data = cp2u(driver->opt.charsets[1],
(unsigned char) data);
}
if (data == UCS_NO_CHAR)
return;
#ifdef CONFIG_COMBINE
if (data >= UCS_BEGIN_COMBINED && data <= last_combined) {
unicode_val_T *text = combined[data - UCS_BEGIN_COMBINED];
if (driver->opt.combine) {
/* XTerm */
while (*text != UCS_END_COMBINED) {
add_to_string(screen, encode_utf8(*text));
text++;
}
return;
} else {
/* Others */
data = *text;
}
}
#endif /* CONFIG_COMBINE */
if (!isscreensafe_ucs(data))
data = UCS_SPACE;
add_to_string(screen, encode_utf8(data));
} else
#endif /* CONFIG_UTF8 */
if (use_utf8_io(driver)) {
int charset = driver->opt.charsets[!!border];
if (border || isscreensafe(data))
add_to_string(screen, cp2utf8(charset, data));
else /* UCS_SPACE <= 0x7F and so fits in one UTF-8 byte */
add_char_to_string(screen, UCS_SPACE);
} else {
if (border || isscreensafe(data))
add_char_to_string(screen, (unsigned char)data);
else
add_char_to_string(screen, ' ');
}
}
/** Time critical section. */
static inline void
add_char16(struct string *screen, struct screen_driver *driver,
struct screen_char *ch, struct screen_state *state)
{
unsigned char border = (ch->attr & SCREEN_ATTR_FRAME);
unsigned char italic = (ch->attr & SCREEN_ATTR_ITALIC);
unsigned char underline = (ch->attr & SCREEN_ATTR_UNDERLINE);
unsigned char bold = (ch->attr & SCREEN_ATTR_BOLD);
if (
#ifdef CONFIG_UTF8
!(driver->opt.utf8_cp && ch->data == UCS_NO_CHAR) &&
#endif /* CONFIG_UTF8 */
border != state->border && driver->opt.frame_seqs
) {
state->border = border;
add_term_string(screen, driver->opt.frame_seqs[!!border]);
}
if (
#ifdef CONFIG_UTF8
!(driver->opt.utf8_cp && ch->data == UCS_NO_CHAR) &&
#endif /* CONFIG_UTF8 */
italic != state->italic && driver->opt.italic
) {
state->italic = italic;
#ifdef CONFIG_TERMINFO
if (driver->opt.terminfo) {
add_to_string(screen, terminfo_set_italics(italic));
} else
#endif
{
add_term_string(screen, driver->opt.italic[!!italic]);
}
}
if (
#ifdef CONFIG_UTF8
!(driver->opt.utf8_cp && ch->data == UCS_NO_CHAR) &&
#endif /* CONFIG_UTF8 */
underline != state->underline && driver->opt.underline
) {
state->underline = underline;
#ifdef CONFIG_TERMINFO
if (driver->opt.terminfo) {
add_to_string(screen, terminfo_set_underline(underline));
} else
#endif
{
add_term_string(screen, driver->opt.underline[!!underline]);
}
}
if (
#ifdef CONFIG_UTF8
!(driver->opt.utf8_cp && ch->data == UCS_NO_CHAR) &&
#endif /* CONFIG_UTF8 */
bold != state->bold
) {
state->bold = bold;
if (bold) {
#ifdef CONFIG_TERMINFO
if (driver->opt.terminfo) {
add_to_string(screen, terminfo_set_bold(bold));
} else
#endif
{
add_bytes_to_string(screen, "\033[1m", 4);
}
} else {
/* Force repainting of the other attributes. */
state->color[0] = ch->c.color[0] + 1;
}
}
if (
#ifdef CONFIG_UTF8
!(driver->opt.utf8_cp && ch->data == UCS_NO_CHAR) &&
#endif /* CONFIG_UTF8 */
!compare_color_16(ch->c.color, state->color)
) {
copy_color_16(state->color, ch->c.color);
#ifdef CONFIG_TERMINFO
if (driver->opt.terminfo) {
add_to_string(screen, terminfo_set_bold(bold));
add_to_string(screen, terminfo_set_foreground(TERM_COLOR_FOREGROUND_16(ch->c.color)));
add_to_string(screen, terminfo_set_background(TERM_COLOR_BACKGROUND_16(ch->c.color)));
if (italic)
add_to_string(screen, terminfo_set_italics(italic));
if (underline)
add_to_string(screen, terminfo_set_underline(underline));
} else
#endif
{
add_bytes_to_string(screen, "\033[0", 3);
/* @set_screen_driver_opt has set @driver->opt.color_mode
* according to terminal-type-specific options.
* The caller of @add_char16 has already partially
* checked it, but there are still these possibilities:
* - COLOR_MODE_MONO. Then don't show colors, but
* perhaps use the standout attribute.
* - COLOR_MODE_16. Use 16 colors.
* - An unsupported color mode. Use 16 colors. */
if (driver->opt.color_mode != COLOR_MODE_MONO) {
char code[] = ";30;40";
unsigned char bgcolor = TERM_COLOR_BACKGROUND_16(ch->c.color);
code[2] += TERM_COLOR_FOREGROUND_16(ch->c.color);
if (!driver->opt.transparent || bgcolor != 0) {
code[5] += bgcolor;
add_bytes_to_string(screen, code, 6);
} else {
add_bytes_to_string(screen, code, 3);
}
} else if (ch->attr & SCREEN_ATTR_STANDOUT) {
/* Flip the fore- and background colors for highlighing
* purposes. */
add_bytes_to_string(screen, ";7", 2);
}
if (italic && driver->opt.italic) {
add_bytes_to_string(screen, ";3", 2);
}
if (underline && driver->opt.underline) {
add_bytes_to_string(screen, ";4", 2);
}
/* Check if the char should be rendered bold. */
if (bold) {
add_bytes_to_string(screen, ";1", 2);
}
add_bytes_to_string(screen, "m", 1);
}
}
add_char_data(screen, driver, ch->data, border);
}
#if defined(CONFIG_88_COLORS) || defined(CONFIG_256_COLORS)
static inline void
add_char_color(struct string *screen, const struct string *seq, unsigned char color)
{
char color_buf[3];
char *color_pos = color_buf;
int seq_pos = 0;
int color_len = 1;
check_string_magic(seq);
for (; seq->source[seq_pos] != '%'; seq_pos++) ;
add_bytes_to_string(screen, seq->source, seq_pos);
if (color < 10) {
color_pos += 2;
} else {
int color2;
++color_len;
if (color < 100) {
++color_pos;
} else {
++color_len;
if (color < 200) {
color_buf[0] = '1';
color -= 100;
} else {
color_buf[0] = '2';
color -= 200;
}
}
color2 = (color % 10);
color /= 10;
color_buf[1] = '0' + color;
color = color2;
}
color_buf[2] = '0' + color;
add_bytes_to_string(screen, color_pos, color_len);
seq_pos += 2; /* Skip "%d" */
add_bytes_to_string(screen, &seq->source[seq_pos], seq->length - seq_pos);
}
#define add_background_color(str, seq, chr) add_char_color(str, &(seq)[1], (chr)->c.color[1])
#define add_foreground_color(str, seq, chr) add_char_color(str, &(seq)[0], (chr)->c.color[0])
/** Time critical section. */
static inline void
add_char256(struct string *screen, struct screen_driver *driver,
struct screen_char *ch, struct screen_state *state)
{
unsigned char attr_delta = (ch->attr ^ state->attr);
if (
#ifdef CONFIG_UTF8
!(driver->opt.utf8_cp && ch->data == UCS_NO_CHAR) &&
#endif /* CONFIG_UTF8 */
attr_delta
) {
if ((attr_delta & SCREEN_ATTR_FRAME) && driver->opt.frame_seqs) {
state->border = !!(ch->attr & SCREEN_ATTR_FRAME);
add_term_string(screen, driver->opt.frame_seqs[state->border]);
}
if ((attr_delta & SCREEN_ATTR_ITALIC) && driver->opt.italic) {
state->italic = !!(ch->attr & SCREEN_ATTR_ITALIC);
#ifdef CONFIG_TERMINFO
if (driver->opt.terminfo) {
add_to_string(screen, terminfo_set_italics(state->italic));
} else
#endif
{
add_term_string(screen, driver->opt.italic[state->italic]);
}
}
if ((attr_delta & SCREEN_ATTR_UNDERLINE) && driver->opt.underline) {
state->underline = !!(ch->attr & SCREEN_ATTR_UNDERLINE);
#ifdef CONFIG_TERMINFO
if (driver->opt.terminfo) {
add_to_string(screen, terminfo_set_underline(state->underline));
} else
#endif
{
add_term_string(screen, driver->opt.underline[state->underline]);
}
}
if (attr_delta & SCREEN_ATTR_BOLD) {
if (ch->attr & SCREEN_ATTR_BOLD) {
#ifdef CONFIG_TERMINFO
if (driver->opt.terminfo) {
add_to_string(screen, terminfo_set_bold(1));
} else
#endif
{
add_bytes_to_string(screen, "\033[1m", 4);
}
} else {
/* Force repainting of the other attributes. */
state->color[0] = ch->c.color[0] + 1;
}
}
state->attr = ch->attr;
}
if (
#ifdef CONFIG_UTF8
!(driver->opt.utf8_cp && ch->data == UCS_NO_CHAR) &&
#endif /* CONFIG_UTF8 */
!compare_color_256(ch->c.color, state->color)
) {
copy_color_256(state->color, ch->c.color);
#ifdef CONFIG_TERMINFO
if (driver->opt.terminfo) {
add_to_string(screen, terminfo_set_bold(ch->attr & SCREEN_ATTR_BOLD));
add_to_string(screen, terminfo_set_foreground(ch->c.color[0]));
add_to_string(screen, terminfo_set_background(ch->c.color[1]));
if (ch->attr & SCREEN_ATTR_ITALIC && driver->opt.italic) {
state->italic = !!(ch->attr & SCREEN_ATTR_ITALIC);
add_to_string(screen, terminfo_set_italics(state->italic));
}
if (ch->attr & SCREEN_ATTR_UNDERLINE && driver->opt.underline) {
state->underline = !!(ch->attr & SCREEN_ATTR_UNDERLINE);
add_to_string(screen, terminfo_set_underline(state->underline));
}
} else
#endif
{
add_foreground_color(screen, driver->opt.color256_seqs, ch);
if (!driver->opt.transparent || ch->c.color[1] != 0) {
add_background_color(screen, driver->opt.color256_seqs, ch);
}
if (ch->attr & SCREEN_ATTR_BOLD)
add_bytes_to_string(screen, "\033[1m", 4);
if (ch->attr & SCREEN_ATTR_ITALIC && driver->opt.italic) {
state->italic = !!(ch->attr & SCREEN_ATTR_ITALIC);
add_term_string(screen, driver->opt.italic[state->italic]);
}
if (ch->attr & SCREEN_ATTR_UNDERLINE && driver->opt.underline) {
state->underline = !!(ch->attr & SCREEN_ATTR_UNDERLINE);
add_term_string(screen, driver->opt.underline[state->underline]);
}
}
}
add_char_data(screen, driver, ch->data, ch->attr & SCREEN_ATTR_FRAME);
}
#endif
#ifdef CONFIG_TRUE_COLOR
static const struct string color_true_seqs[] = {
/* foreground: */ TERM_STRING("\033[0;38;2"),
/* background: */ TERM_STRING("\033[48;2"),
};
#define add_true_background_color(str, seq, chr) add_char_true_color(str, &(seq)[1], &(chr)->c.color[3])
#define add_true_foreground_color(str, seq, chr) add_char_true_color(str, &(seq)[0], &(chr)->c.color[0])
static inline void
add_char_true_color(struct string *screen, const struct string *seq, unsigned char *colors)
{
char color_buf[3];
int i;
check_string_magic(seq);
add_string_to_string(screen, seq);
for (i = 0; i < 3; i++) {
char *color_pos = color_buf;
int color_len = 1;
unsigned char color = colors[i];
add_char_to_string(screen, ';');
if (color < 10) {
color_pos += 2;
} else {
int color2;
++color_len;
if (color < 100) {
++color_pos;
} else {
++color_len;
if (color < 200) {
color_buf[0] = '1';
color -= 100;
} else {
color_buf[0] = '2';
color -= 200;
}
}
color2 = (color % 10);
color /= 10;
color_buf[1] = '0' + color;
color = color2;
}
color_buf[2] = '0' + color;
add_bytes_to_string(screen, color_pos, color_len);
}
add_char_to_string(screen, 'm');
}
/** Time critical section. */
static inline void
add_char_true(struct string *screen, struct screen_driver *driver,
struct screen_char *ch, struct screen_state *state)
{
unsigned char attr_delta = (ch->attr ^ state->attr);
if (
#ifdef CONFIG_UTF8
!(driver->opt.utf8_cp && ch->data == UCS_NO_CHAR) &&
#endif /* CONFIG_UTF8 */
attr_delta
) {
if ((attr_delta & SCREEN_ATTR_FRAME) && driver->opt.frame_seqs) {
state->border = !!(ch->attr & SCREEN_ATTR_FRAME);
add_term_string(screen, driver->opt.frame_seqs[state->border]);
}
if ((attr_delta & SCREEN_ATTR_ITALIC) && driver->opt.italic) {
state->italic = !!(ch->attr & SCREEN_ATTR_ITALIC);
add_term_string(screen, driver->opt.italic[state->italic]);
}
if ((attr_delta & SCREEN_ATTR_UNDERLINE) && driver->opt.underline) {
state->underline = !!(ch->attr & SCREEN_ATTR_UNDERLINE);
add_term_string(screen, driver->opt.underline[state->underline]);
}
if (attr_delta & SCREEN_ATTR_BOLD) {
if (ch->attr & SCREEN_ATTR_BOLD) {
add_bytes_to_string(screen, "\033[1m", 4);
} else {
/* Force repainting of the other attributes. */
state->color[0] = ch->c.color[0] + 1;
}
}
state->attr = ch->attr;
}
if (
#ifdef CONFIG_UTF8
!(driver->opt.utf8_cp && ch->data == UCS_NO_CHAR) &&
#endif /* CONFIG_UTF8 */
!compare_color_true(ch->c.color, state->color)
) {
copy_color_true(state->color, ch->c.color);
add_true_foreground_color(screen, color_true_seqs, ch);
if (!driver->opt.transparent || !background_is_black(ch->c.color)) {
add_true_background_color(screen, color_true_seqs, ch);
}
if (ch->attr & SCREEN_ATTR_BOLD)
add_bytes_to_string(screen, "\033[1m", 4);
if (ch->attr & SCREEN_ATTR_ITALIC && driver->opt.italic) {
state->italic = !!(ch->attr & SCREEN_ATTR_ITALIC);
add_term_string(screen, driver->opt.italic[state->italic]);
}
if (ch->attr & SCREEN_ATTR_UNDERLINE && driver->opt.underline) {
state->underline = !!(ch->attr & SCREEN_ATTR_UNDERLINE);
add_term_string(screen, driver->opt.underline[state->underline]);
}
}
add_char_data(screen, driver, ch->data, ch->attr & SCREEN_ATTR_FRAME);
}
#endif
#define add_chars(image_, term_, driver_, state_, ADD_CHAR, compare_bg_color, compare_fg_color) \
{ \
struct terminal_screen *screen = (term_)->screen; \
int y = screen->dirty_from; \
int xmax = (term_)->width - 1; \
int ymax = (term_)->height - 1; \
\
int_upper_bound(&screen->dirty_to, ymax); \
\
for (; y <= screen->dirty_to; y++) { \
int ypos = y * (term_)->width; \
struct screen_char *current = &screen->last_image[ypos]; \
struct screen_char *pos = &screen->image[ypos]; \
struct screen_char *start_of_line = pos; \
int is_last_line = (y == ymax); \
int x = 0; \
int dirty = 0; \
\
for (; x <= xmax; x++, current++, pos++) { \
/* Workaround for terminals without
* "eat_newline_glitch (xn)", e.g., the cons25 family
* of terminals and cygwin terminal.
* It prevents display distortion, but char at bottom
* right of terminal will not be drawn.
* A better fix would be to correctly detects
* terminal type, and/or add a terminal option for
* this purpose. */ \
\
if (is_last_line && x == xmax) \
break; \
\
if (compare_bg_color(pos->c.color, current->c.color)) { \
/* No update for exact match. */ \
if (compare_fg_color(pos->c.color, current->c.color)\
&& pos->data == current->data \
&& pos->attr == current->attr) \
continue; \
\
/* Else if the color match and the data is
* ``space''. */ \
if (pos->data <= ' ' && current->data <= ' ' \
&& pos->attr == current->attr) \
continue; \
} \
dirty = 1; \
break; \
} \
\
if (!dirty) { \
continue; \
} \
add_cursor_move_to_string(image_, y + 1, 1); \
for (pos = start_of_line, x = 0; x <= xmax; x++, pos++) { \
ADD_CHAR(image_, driver_, pos, state_); \
} \
} \
}
/*! Updating of the terminal screen is done by checking what needs to
* be updated using the last screen. */
void
redraw_screen(struct terminal *term)
{
struct screen_driver *driver;
struct string image;
struct screen_state state = INIT_SCREEN_STATE;
struct terminal_screen *screen = term->screen;
if (!screen || screen->dirty_from > screen->dirty_to) return;
if (term->master && is_blocked()) return;
driver = get_screen_driver(term);
if (!driver) return;
if (!init_string(&image)) return;
switch (driver->opt.color_mode) {
default:
/* If the desired color mode was not compiled in,
* use 16 colors. */
case COLOR_MODE_MONO:
case COLOR_MODE_16:
add_chars(&image, term, driver, &state, add_char16, compare_bg_color_16, compare_fg_color_16);
break;
#ifdef CONFIG_88_COLORS
case COLOR_MODE_88:
add_chars(&image, term, driver, &state, add_char256, compare_bg_color_256, compare_fg_color_256);
break;
#endif
#ifdef CONFIG_256_COLORS
case COLOR_MODE_256:
add_chars(&image, term, driver, &state, add_char256, compare_bg_color_256, compare_fg_color_256);
break;
#endif
#ifdef CONFIG_TRUE_COLOR
case COLOR_MODE_TRUE_COLOR:
add_chars(&image, term, driver, &state, add_char_true, compare_bg_color_true, compare_fg_color_true);
break;
#endif
case COLOR_MODES:
case COLOR_MODE_DUMP:
INTERNAL("Invalid color mode (%d).", driver->opt.color_mode);
return;
}
if (image.length) {
if (driver->opt.color_mode != COLOR_MODE_MONO)
add_bytes_to_string(&image, "\033[37;40m", 8);
add_bytes_to_string(&image, "\033[0m", 4);
/* If we ended in border state end the frame mode. */
if (state.border && driver->opt.frame_seqs)
add_term_string(&image, driver->opt.frame_seqs[0]);
}
/* Even if nothing was redrawn, we possibly still need to move
* cursor. */
if (image.length
|| screen->cx != screen->lcx
|| screen->cy != screen->lcy) {
screen->lcx = screen->cx;
screen->lcy = screen->cy;
add_cursor_move_to_string(&image, screen->cy + 1,
screen->cx + 1);
}
if (image.length) {
if (term->master) want_draw();
hard_write(term->fdout, image.source, image.length);
if (term->master) done_draw();
}
done_string(&image);
copy_screen_chars(screen->last_image, screen->image, term->width * term->height);
screen->dirty_from = term->height;
screen->dirty_to = 0;
}
void
erase_screen(struct terminal *term)
{
if (term->master) {
if (is_blocked()) return;
want_draw();
}
#ifdef CONFIG_TERMINFO
if (get_cmd_opt_bool("terminfo")) {
const char *text = terminfo_clear_screen();
hard_write(term->fdout, text, strlen(text));
} else
#endif
hard_write(term->fdout, "\033[2J\033[1;1H", 10);
if (term->master) done_draw();
}
void
beep_terminal(struct terminal *term)
{
#ifdef CONFIG_OS_WIN32
MessageBeep(MB_ICONEXCLAMATION);
#else
hard_write(term->fdout, "\a", 1);
#endif
}
struct terminal_screen *
init_screen(void)
{
struct terminal_screen *screen;
screen = (struct terminal_screen *)mem_calloc(1, sizeof(*screen));
if (!screen) return NULL;
screen->lcx = -1;
screen->lcy = -1;
return screen;
}
/*! The two images are allocated in one chunk.
* @todo TODO: It seems allocation failure here is fatal.
* We should do something! */
void
resize_screen(struct terminal *term, int width, int height)
{
struct terminal_screen *screen;
struct screen_char *image;
size_t size, bsize;
assert(term && term->screen);
screen = term->screen;
assert(width >= 0);
assert(height >= 0);
size = width * height;
if (size <= 0) return;
bsize = size * sizeof(*image);
image = (struct screen_char *)mem_realloc(screen->image, bsize * 2);
if (!image) return;
screen->image = image;
screen->last_image = image + size;
memset(screen->image, 0, bsize);
memset(screen->last_image, 0xFF, bsize);
term->width = width;
term->height = height;
set_screen_dirty(screen, 0, height);
}
void
done_screen(struct terminal_screen *screen)
{
mem_free_if(screen->image);
mem_free(screen);
}
struct module terminal_screen_module = struct_module(
/* Because this module is a submodule of terminal_module,
* which is listed in main_modules rather than in builtin_modules,
* its name does not appear in the user interface and
* so need not be translatable. */
/* name: */ "Terminal Screen",
/* options: */ NULL,
/* hooks: */ NULL,
/* submodules: */ NULL,
/* data: */ NULL,
/* init: */ NULL,
/* done: */ done_screen_drivers
);
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