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xenocara/app/xterm/graphics.c

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/* $XTermId: graphics.c,v 1.17 2013/11/26 22:15:21 tom Exp $ */
/*
* Copyright 2013 by Ross Combs
*
* All Rights Reserved
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE ABOVE LISTED COPYRIGHT HOLDER(S) BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
* Except as contained in this notice, the name(s) of the above copyright
* holders shall not be used in advertising or otherwise to promote the
* sale, use or other dealings in this Software without prior written
* authorization.
*/
#include <xterm.h>
#include <stdio.h>
#include <math.h>
#include <ctype.h>
#include <stdlib.h>
#include <data.h>
#include <VTparse.h>
#include <ptyx.h>
#include <assert.h>
#include <graphics.h>
#undef DUMP_SIXEL_BITMAP
#undef DEBUG_REFRESH
/* TODO:
* ReGIS:
* - everything
* sixel:
* - erase graphic when erasing screen
* - maintain ordered list/array instead of qsort()
* - erase text under graphics if bg not transparent
* - erase scrolled portions of all graphics on alt buffer
* - delete graphic if scrolled past end of scrollback
* - delete graphic if all pixels are transparent/erased
* - dynamic memory allocation, add configurable limits
* - auto convert color graphics in VT330 mode
* - investigate second graphic framebuffer for ReGIS -- does this apply to text and sixel graphics?
* - fix problem where new_row < 0 during sixel parsing (see FIXME)
* VT55/VT105 waveform graphics
* - everything
* escape sequences
* - way to query font size without "window ops" (or make "window ops" permissions more fine grained)
* - way to query and/or set the maximum number of color registers
*/
/* font sizes:
* VT510:
* 80 Columns 132 Columns Maximum Number of Lines
* 10 x 16 6 x 16 26 lines + keyboard indicator line
* 10 x 10 6 x 10 42 lines + keyboard indicator line
* 10 x 8 6 x 8 53 lines + keyboard indicator line
* 10 x 13 6 x 13 26 lines + keyboard indicator line
*/
/***====================================================================***/
/*
* Parse numeric parameters which have the operator as a prefix rather than a
* suffix as in ANSI format.
*
* # 0
* #1 1
* #1; 1
* "1;2;640;480 4
* #1;2;0;0;0 5
*/
static void
parse_prefixedtype_params(ANSI *params, const char **string)
{
const char *cp = *string;
ParmType nparam = 0;
int last_empty = 1;
memset(params, 0, sizeof(*params));
params->a_final = CharOf(*cp);
if (*cp != '\0')
cp++;
while (*cp != '\0') {
Char ch = CharOf(*cp);
if (isdigit(ch)) {
last_empty = 0;
if (nparam < NPARAM) {
params->a_param[nparam] =
(ParmType) ((params->a_param[nparam] * 10)
+ (ch - '0'));
}
} else if (ch == ';') {
last_empty = 1;
nparam++;
} else if (ch == ' ' || ch == '\r' || ch == '\n') {
/* EMPTY */ ;
} else {
break;
}
cp++;
}
*string = cp;
if (!last_empty)
nparam++;
if (nparam > NPARAM)
params->a_nparam = NPARAM;
else
params->a_nparam = nparam;
}
typedef struct {
Pixel pix;
short r, g, b;
short allocated;
} ColorRegister;
#define MAX_COLOR_REGISTERS 256U
#define COLOR_HOLE ((unsigned short)MAX_COLOR_REGISTERS)
#define BUFFER_WIDTH 1000
#define BUFFER_HEIGHT 800
typedef struct {
RegisterNum pixels[BUFFER_HEIGHT * BUFFER_WIDTH];
ColorRegister private_color_registers[MAX_COLOR_REGISTERS];
ColorRegister *color_registers;
char color_registers_used[MAX_COLOR_REGISTERS];
XtermWidget xw;
int max_width; /* largest image which can be stored */
int max_height; /* largest image which can be stored */
RegisterNum current_register;
int valid_registers; /* for wrap-around behavior */
int device_background; /* 0: set to color 0, 1: unchanged */
int background; /* current background color */
int aspect_vertical;
int aspect_horizontal;
int declared_width; /* size as reported by the application */
int declared_height; /* size as reported by the application */
int actual_width; /* size measured during parsing */
int actual_height; /* size measured during parsing */
int private_colors; /* if not using the shared color registers */
int charrow; /* upper left starting point in characters */
int charcol; /* upper left starting point in characters */
int pixw; /* width of graphic pixels in screen pixels */
int pixh; /* height of graphic pixels in screen pixels */
int row; /* context used during parsing */
int col; /* context used during parsing */
int bufferid; /* which screen buffer the graphic is associated with */
unsigned int id; /* sequential id used for preserving layering */
int valid; /* if the graphic has been initialized */
int dirty; /* if the graphic needs to be redrawn */
} SixelGraphic;
static unsigned int next_sixel_id = 0U;
static ColorRegister shared_color_registers[MAX_COLOR_REGISTERS];
#define MAX_SIXEL_GRAPHICS 16U
static SixelGraphic sixel_graphics[MAX_SIXEL_GRAPHICS];
/* sixel scrolling:
* VK100/GIGI ? (did it even support Sixel?)
* VT125 unsupported
* VT240 unsupported
* VT241 unsupported
* VT330 mode setting
* VT340 mode setting
* dxterm ?
*/
static void
init_sixel_background(SixelGraphic *graphic)
{
RegisterNum bgcolor = (RegisterNum) graphic->background;
int r, c;
TRACE(("initializing sixel background to size=%dx%d bgcolor=%hu\n",
graphic->declared_width,
graphic->declared_height,
bgcolor));
for (r = 0; r < graphic->max_height; r++) {
for (c = 0; c < graphic->max_width; c++) {
if (c < graphic->declared_width && r < graphic->declared_height) {
graphic->pixels[r * graphic->max_width + c] = bgcolor;
} else {
graphic->pixels[r * graphic->max_width + c] = COLOR_HOLE;
}
}
}
}
static void
set_sixel(SixelGraphic *graphic, int sixel)
{
RegisterNum color;
int pix;
color = graphic->current_register;
TRACE(("drawing sixel at pos=%d,%d color=%hu (hole=%d, [%d,%d,%d])\n",
graphic->col,
graphic->row,
color,
color == COLOR_HOLE,
((color != COLOR_HOLE)
? (unsigned int) graphic->color_registers[color].r : 0U),
((color != COLOR_HOLE)
? (unsigned int) graphic->color_registers[color].g : 0U),
((color != COLOR_HOLE)
? (unsigned int) graphic->color_registers[color].b : 0U)));
for (pix = 0; pix < 6; pix++) {
if (graphic->col < graphic->max_width &&
graphic->row + pix < graphic->max_height) {
if (sixel & (1 << pix)) {
if (graphic->col + 1 > graphic->actual_width) {
graphic->actual_width = graphic->col + 1;
}
if (graphic->row + pix + 1 > graphic->actual_height) {
graphic->actual_height = graphic->row + pix + 1;
}
graphic->pixels[
(((graphic->row + pix) * graphic->max_width)
+ graphic->col)
] = color;
}
} else {
TRACE(("sixel pixel %d out of bounds\n", pix));
}
}
}
static void
set_sixel_color_register(ColorRegister *color_registers,
int color,
int r,
int g,
int b)
{
ColorRegister *reg = &color_registers[color];
reg->r = (short) r;
reg->g = (short) g;
reg->b = (short) b;
reg->allocated = 0;
}
static void
init_color_registers(ColorRegister *color_registers, int terminal_id)
{
TRACE(("initializing colors for %d\n", terminal_id));
{
unsigned int i;
for (i = 0U; i < MAX_COLOR_REGISTERS; i++) {
set_sixel_color_register(color_registers, (int) i, 0, 0, 0);
}
}
/*
* default color registers:
* (mono) (color)
* VK100/GIGI (fixed)
* VT125:
* 0: 0% 0%
* 1: 33% blue
* 2: 66% red
* 3: 100% green
* VT240:
* 0: 0% 0%
* 1: 33% blue
* 2: 66% red
* 3: 100% green
* VT241:
* 0: 0% 0%
* 1: 33% blue
* 2: 66% red
* 3: 100% green
* VT330:
* 0: 0% 0% (bg for light on dark mode)
* 1: 33% blue (red?)
* 2: 66% red (green?)
* 3: 100% green (yellow?) (fg for light on dark mode)
* VT340:
* 0: 0% 0% (bg for light on dark mode)
* 1: 14% blue
* 2: 29% red
* 3: 43% green
* 4: 57% magenta
* 5: 71% cyan
* 6: 86% yellow
* 7: 100% 50% (fg for light on dark mode)
* 8: 0% 25%
* 9: 14% gray-blue
* 10: 29% gray-red
* 11: 43% gray-green
* 12: 57% gray-magenta
* 13: 71% gray-cyan
* 14: 86% gray-yellow
* 15: 100% 75%
* dxterm:
* ?
*/
switch (terminal_id) {
case 125:
case 241:
set_sixel_color_register(color_registers, 0, 0, 0, 0);
set_sixel_color_register(color_registers, 1, 0, 0, 100);
set_sixel_color_register(color_registers, 2, 0, 100, 0);
set_sixel_color_register(color_registers, 3, 100, 0, 0);
break;
case 240:
case 330:
set_sixel_color_register(color_registers, 0, 0, 0, 0);
set_sixel_color_register(color_registers, 1, 33, 33, 33);
set_sixel_color_register(color_registers, 2, 66, 66, 66);
set_sixel_color_register(color_registers, 3, 100, 100, 100);
break;
case 340:
default:
set_sixel_color_register(color_registers, 0, 0, 0, 0);
set_sixel_color_register(color_registers, 1, 20, 20, 80);
set_sixel_color_register(color_registers, 2, 80, 13, 13);
set_sixel_color_register(color_registers, 3, 20, 80, 20);
set_sixel_color_register(color_registers, 4, 80, 20, 80);
set_sixel_color_register(color_registers, 5, 20, 80, 80);
set_sixel_color_register(color_registers, 6, 80, 80, 20);
set_sixel_color_register(color_registers, 7, 53, 53, 53);
set_sixel_color_register(color_registers, 8, 26, 26, 26);
set_sixel_color_register(color_registers, 9, 33, 33, 60);
set_sixel_color_register(color_registers, 10, 60, 26, 26);
set_sixel_color_register(color_registers, 11, 33, 60, 33);
set_sixel_color_register(color_registers, 12, 60, 33, 60);
set_sixel_color_register(color_registers, 13, 33, 60, 60);
set_sixel_color_register(color_registers, 14, 60, 60, 33);
set_sixel_color_register(color_registers, 15, 80, 80, 80);
break;
}
}
static void
init_sixel_graphic(SixelGraphic *graphic, int terminal_id, int private_colors)
{
TRACE(("initializing sixel graphic\n"));
graphic->dirty = 1;
memset(graphic->pixels, 0, sizeof(graphic->pixels));
memset(graphic->color_registers_used, 0, sizeof(graphic->color_registers_used));
/*
* dimensions (REGIS logical, physical):
* VK100/GIGI 768x4?? 768x2??
* VT125 768x460 768x230(+10status) (1:2 aspect ratio, REGIS halves vertical addresses through "odd y emulation")
* VT240 800x460 800x230(+10status) (1:2 aspect ratio, REGIS halves vertical addresses through "odd y emulation")
* VT241 800x460 800x230(+10status) (1:2 aspect ratio, REGIS halves vertical addresses through "odd y emulation")
* VT330 800x480 800x480(+?status)
* VT340 800x480 800x480(+?status)
* dxterm ?x? variable?
*/
graphic->max_width = BUFFER_WIDTH;
graphic->max_height = BUFFER_HEIGHT;
/* default isn't white on the VT240, but not sure what it is */
graphic->current_register = 3; /* FIXME: using green, but not sure what it should be */
/*
* When an application selects the monochrome map: the terminal sets the
* 16 entries of the color map to the default monochrome gray level.
* Therefore, the original colors are lost when changing from the color map
* to the monochrome map.
*
* If you change the color value (green, red, blue) using the Color Set-Up
* screen or a ReGIS command, the VT340 sets the gray scale by using the
* formula (2G + R)/3.
*
* When an application selects the color map: the terminal sets the 16
* entries of the color map to the default (color) color map.
*/
/*
* color capabilities:
* VK100/GIGI 1 plane (12x1 pixel attribute blocks) colorspace is 8 fixed colors (black, white, red, green, blue, cyan, yellow, magenta)
* VT125 2 planes (4 registers) colorspace is (64?) (color), ? (grayscale)
* VT240 2 planes (4 registers) colorspace is ? shades (grayscale)
* VT241 2 planes (4 registers) colorspace is ? (color), ? shades (grayscale)
* VT330 2 planes (4 registers) colorspace is 4 shades (grayscale)
* VT340 4 planes (16 registers) colorspace is r16g16b16 (color), 16 shades (grayscale)
* dxterm ?
*/
switch (terminal_id) {
case 125:
graphic->valid_registers = 4;
break;
case 240:
graphic->valid_registers = 4;
break;
case 241:
graphic->valid_registers = 4;
break;
case 330:
graphic->valid_registers = 4;
break;
case 340:
graphic->valid_registers = 16;
break;
default:
graphic->valid_registers = 64; /* unknown graphics model -- might as well be generous */
break;
}
/*
* text and graphics interactions:
* VK100/GIGI text writes on top of graphics buffer, color attribute shared with text
* VT240,VT241,VT330,VT340 text writes on top of graphics buffer
* VT125 graphics buffer overlaid on top of text in B&W display, text not present in color display
*/
/* FIXME: is this always zero? what about in light background mode? */
graphic->device_background = 0; /* default background color register */
/* pixel sizes seem to have differed by model and options */
/* VT240 and VT340 defaulted to 2:1 ratio */
graphic->aspect_vertical = 2;
graphic->aspect_horizontal = 1;
graphic->declared_width = 0;
graphic->declared_height = 0;
graphic->actual_width = 0;
graphic->actual_height = 0;
graphic->private_colors = private_colors;
if (graphic->private_colors) {
TRACE(("sixel using private color registers\n"));
init_color_registers(graphic->private_color_registers, terminal_id);
graphic->color_registers = graphic->private_color_registers;
} else {
TRACE(("sixel using shared color registers\n"));
graphic->color_registers = shared_color_registers;
}
graphic->charrow = 0;
graphic->charcol = 0;
graphic->row = 0;
graphic->col = 0;
graphic->valid = 0;
}
static SixelGraphic *
get_sixel_graphic(XtermWidget xw)
{
TScreen const *screen = TScreenOf(xw);
int bufferid = screen->whichBuf;
int terminal_id = screen->terminal_id;
int private_colors = screen->privatecolorregisters;
SixelGraphic *graphic;
unsigned int ii;
for (ii = 0U; ii < MAX_SIXEL_GRAPHICS; ii++) {
graphic = &sixel_graphics[ii];
if (!graphic->valid)
break;
}
if (ii >= MAX_SIXEL_GRAPHICS) {
int min_charrow = 0;
SixelGraphic *min_graphic = NULL;
for (ii = 0U; ii < MAX_SIXEL_GRAPHICS; ii++) {
graphic = &sixel_graphics[ii];
if (!min_graphic || graphic->charrow < min_charrow) {
min_charrow = graphic->charrow;
min_graphic = graphic;
}
}
graphic = min_graphic;
}
graphic->xw = xw;
graphic->bufferid = bufferid;
graphic->id = next_sixel_id++;
init_sixel_graphic(graphic, terminal_id, private_colors);
return graphic;
}
static void
dump_sixel(SixelGraphic const *graphic)
{
#ifdef DUMP_SIXEL_BITMAP
int r, c;
RegisterNum color;
ColorRegister const *reg;
#endif
(void) graphic;
TRACE(("sixel stats: charrow=%d charcol=%d actual_width=%d actual_height=%d pixw=%d pixh=%d\n",
graphic->charrow,
graphic->charcol,
graphic->actual_width,
graphic->actual_height,
graphic->pixw,
graphic->pixh));
#ifdef DUMP_SIXEL_BITMAP
TRACE(("sixel dump:\n"));
for (r = 0; r < graphic->max_height; r++) {
for (c = 0; c < graphic->max_width; c++) {
color = graphic->pixels[r * graphic->max_width + c];
if (color == COLOR_HOLE) {
TRACE(("?"));
} else {
reg = &graphic->color_registers[color];
if (reg->r + reg->g + reg->b > 200) {
TRACE(("#"));
} else if (reg->r + reg->g + reg->b > 150) {
TRACE(("%%"));
} else if (reg->r + reg->g + reg->b > 100) {
TRACE((":"));
} else if (reg->r + reg->g + reg->b > 80) {
TRACE(("."));
} else {
TRACE((" "));
}
}
}
TRACE(("\n"));
}
#endif
TRACE(("\n"));
}
static void
set_shared_color_register(int color, int r, int g, int b)
{
SixelGraphic *graphic;
unsigned int ii;
assert(color < (int) MAX_COLOR_REGISTERS);
set_sixel_color_register(shared_color_registers, color, r, g, b);
for (ii = 0U; ii < MAX_SIXEL_GRAPHICS; ii++) {
graphic = &sixel_graphics[ii];
if (graphic->private_colors)
continue;
if (graphic->color_registers_used[ii]) {
graphic->dirty = 1;
}
}
}
#define ScaleForXColor(s) (unsigned short) ((long)(s) * 65535 / 100)
static Pixel
sixel_register_to_xpixel(ColorRegister *reg, XtermWidget xw)
{
if (!reg->allocated) {
XColor def;
def.red = ScaleForXColor(reg->r);
def.green = ScaleForXColor(reg->g);
def.blue = ScaleForXColor(reg->b);
def.flags = DoRed | DoGreen | DoBlue;
if (!allocateBestRGB(xw, &def)) {
return 0UL;
}
reg->pix = def.pixel;
reg->allocated = 1;
}
/* FIXME: with so many possible colors we need to determine
* when to free them to be nice to PseudoColor displays
*/
return reg->pix;
}
static void
refresh_sixel_graphic(TScreen const *screen,
SixelGraphic *graphic,
int xbase,
int ybase,
int x,
int y,
int w,
int h)
{
Display *display = screen->display;
Window vwindow = WhichVWin(screen)->window;
GC graphics_gc;
int r, c;
int wx, wy;
int pw, ph;
RegisterNum color;
RegisterNum old_fg;
XGCValues xgcv;
XtGCMask mask;
int holes, total;
TRACE(("refreshing sixel graphic from %d,%d %dx%d (valid=%d, bg=%dx%d size=%dx%d, max=%dx%d) at base=%d,%d\n",
x, y, w, h,
graphic->valid,
graphic->declared_width,
graphic->declared_height,
graphic->actual_width,
graphic->actual_height,
graphic->max_width,
graphic->max_height,
xbase, ybase));
memset(&xgcv, 0, sizeof(xgcv));
xgcv.foreground = 0UL;
xgcv.graphics_exposures = False;
mask = GCForeground | GCGraphicsExposures;
graphics_gc = XCreateGC(display, vwindow, mask, &xgcv);
pw = graphic->pixw;
ph = graphic->pixh;
TRACE(("refreshed graphic covers 0,0 to %d,%d\n",
(graphic->actual_width - 1) * pw + pw - 1,
(graphic->actual_height - 1) * ph + ph - 1));
TRACE(("refreshed area covers %d,%d to %d,%d\n",
x, y,
x + w - 1,
y + h - 1));
old_fg = COLOR_HOLE;
holes = total = 0;
for (r = 0; r < graphic->actual_height; r++)
for (c = 0; c < graphic->actual_width; c++) {
if (r * ph + ph - 1 < y ||
r * ph > y + h - 1 ||
c * pw + pw - 1 < x ||
c * pw > x + w - 1)
continue;
wy = ybase + r * ph;
wx = xbase + c * pw;
total++;
color = graphic->pixels[r * graphic->max_width + c];
if (color == COLOR_HOLE) {
holes++;
continue;
}
if (color != old_fg) {
xgcv.foreground =
sixel_register_to_xpixel(&graphic->color_registers[color],
graphic->xw);
XChangeGC(display, graphics_gc, mask, &xgcv);
old_fg = color;
}
XFillRectangle(display, vwindow, graphics_gc,
wx, wy, (unsigned) pw, (unsigned) ph);
}
#ifdef DEBUG_REFRESH
{
XColor def;
def.red = (short) (1.0 * 65535.0);
def.green = (short) (0.1 * 65535.0);
def.blue = (short) (1.0 * 65535.0);
def.flags = DoRed | DoGreen | DoBlue;
if (allocateBestRGB(graphic->xw, &def)) {
xgcv.foreground = def.pixel;
XChangeGC(display, graphics_gc, mask, &xgcv);
}
XFillRectangle(display, vwindow, graphics_gc,
xbase + 0,
ybase + 0,
(unsigned) pw, (unsigned) ph);
XFillRectangle(display, vwindow, graphics_gc,
xbase + (graphic->actual_width - 1) * pw,
ybase + (graphic->actual_height - 1) * ph,
(unsigned) pw, (unsigned) ph);
def.red = (unsigned short) ((1.0 - 0.1 * (rand() / (double)
RAND_MAX) * 65535.0));
def.green = (unsigned short) ((0.7 + 0.2 * (rand() / (double)
RAND_MAX)) * 65535.0);
def.blue = (unsigned short) ((0.1 + 0.1 * (rand() / (double)
RAND_MAX)) * 65535.0);
def.flags = DoRed | DoGreen | DoBlue;
if (allocateBestRGB(graphic->xw, &def)) {
xgcv.foreground = def.pixel;
XChangeGC(display, graphics_gc, mask, &xgcv);
}
XDrawLine(display, vwindow, graphics_gc,
xbase + x + 0, ybase + y + 0,
xbase + x + w - 1, ybase + y + 0);
XDrawLine(display, vwindow, graphics_gc,
xbase + x + w - 1, ybase + y + 0,
xbase + x + 0, ybase + y + h - 1);
XDrawLine(display, vwindow, graphics_gc,
xbase + x + 0, ybase + y + h - 1,
xbase + x + w - 1, ybase + y + h - 1);
XDrawLine(display, vwindow, graphics_gc,
xbase + x + w - 1, ybase + y + h - 1,
xbase + x + 0, ybase + y + 0);
}
#endif
XFlush(display);
TRACE(("done refreshing sixel graphic: %d of %d refreshed pixels were holes\n",
holes, total));
XFreeGC(display, graphics_gc);
}
/*
* Primary color hues:
* blue: 0 degrees
* red: 120 degrees
* green: 240 degrees
*/
static void
hls2rgb(int h, int l, int s, short *r, short *g, short *b)
{
double hs = (h + 240) % 360;
double hv = hs / 360.0;
double lv = l / 100.0;
double sv = s / 100.0;
double c, x, m;
double r1, g1, b1;
int hpi;
if (s == 0) {
*r = *g = *b = (short) l;
return;
}
c = (1.0 - fabs(2.0 * lv - 1.0)) * sv;
hpi = (int) (hv * 6.0);
x = (hpi & 1) ? c : 0.0;
m = lv - 0.5 * c;
switch (hpi) {
case 0:
r1 = c;
g1 = x;
b1 = 0.0;
break;
case 1:
r1 = x;
g1 = c;
b1 = 0.0;
break;
case 2:
r1 = 0.0;
g1 = c;
b1 = x;
break;
case 3:
r1 = 0.0;
g1 = x;
b1 = c;
break;
case 4:
r1 = x;
g1 = 0.0;
b1 = c;
break;
case 5:
r1 = c;
g1 = 0.0;
b1 = x;
break;
default:
printf("BAD\n");
*r = (short) 100;
*g = (short) 100;
*b = (short) 100;
return;
}
*r = (short) ((r1 + m) * 100.0 + 0.5);
*g = (short) ((g1 + m) * 100.0 + 0.5);
*b = (short) ((b1 + m) * 100.0 + 0.5);
if (*r < 0)
*r = 0;
else if (*r > 100)
*r = 100;
if (*g < 0)
*g = 0;
else if (*g > 100)
*g = 100;
if (*b < 0)
*b = 0;
else if (*b > 100)
*b = 100;
}
static void
update_sixel_aspect(SixelGraphic *graphic)
{
/* We want to keep the ratio accurate but would like every pixel to have
* the same size so keep these as whole numbers.
*/
/* FIXME: DEC terminals had pixels about twice as tall as they were wide,
* and it seems the VT125 and VT24x only used data from odd graphic rows.
* This means it basically cancels out if we ignore both, except that
* the even rows of pixels may not be written by the application such that
* they are suitable for display. In practice this doesn't seem to be
* an issue but I have very few test files/programs.
*/
if (graphic->aspect_vertical < graphic->aspect_horizontal) {
graphic->pixw = 1;
graphic->pixh = ((graphic->aspect_vertical
+ graphic->aspect_horizontal - 1)
/ graphic->aspect_horizontal);
} else {
graphic->pixw = ((graphic->aspect_horizontal
+ graphic->aspect_vertical - 1)
/ graphic->aspect_vertical);
graphic->pixh = 1;
}
TRACE(("sixel aspect ratio: an=%d ad=%d -> pixw=%d pixh=%d\n",
graphic->aspect_vertical,
graphic->aspect_horizontal,
graphic->pixw,
graphic->pixh));
}
/*
* Interpret sixel graphics sequences.
*
* Resources:
* http://en.wikipedia.org/wiki/Sixel
* http://vt100.net/docs/vt3xx-gp/chapter14.html
* ftp://ftp.cs.utk.edu/pub/shuford/terminal/sixel_graphics_news.txt
* ftp://ftp.cs.utk.edu/pub/shuford/terminal/all_about_sixels.txt
*/
extern void
parse_sixel(XtermWidget xw, ANSI *params, char const *string)
{
TScreen *screen = TScreenOf(xw);
SixelGraphic *graphic;
Char ch;
graphic = get_sixel_graphic(xw);
{
int Pmacro = params->a_param[0];
int Pbgmode = params->a_param[1];
int Phgrid = params->a_param[2];
int Pan = params->a_param[3];
int Pad = params->a_param[4];
int Ph = params->a_param[5];
int Pv = params->a_param[6];
(void) Phgrid;
TRACE(("sixel bitmap graphics sequence: params=%d (Pmacro=%d Pbgmode=%d Phgrid=%d) scroll_amt=%d\n",
params->a_nparam,
Pmacro,
Pbgmode,
Phgrid,
screen->scroll_amt));
switch (params->a_nparam) {
case 7:
if (Pan == 0 || Pad == 0) {
TRACE(("DATA_ERROR: invalid raster ratio %d/%d\n", Pan, Pad));
return;
}
graphic->aspect_vertical = Pan;
graphic->aspect_horizontal = Pad;
if (Ph == 0 || Pv == 0) {
TRACE(("DATA_ERROR: raster image dimensions are invalid %dx%d\n",
Ph, Pv));
return;
}
if (Ph > graphic->max_width || Pv > graphic->max_height) {
TRACE(("DATA_ERROR: raster image dimensions are too large %dx%d\n",
Ph, Pv));
return;
}
graphic->declared_width = Ph;
graphic->declared_height = Pv;
if (graphic->declared_width > graphic->actual_width) {
graphic->actual_width = graphic->declared_width;
}
if (graphic->declared_height > graphic->actual_height) {
graphic->actual_height = graphic->declared_height;
}
break;
case 3:
case 2:
switch (Pmacro) {
case 0:
case 1:
graphic->aspect_vertical = 5;
graphic->aspect_horizontal = 1;
break;
case 2:
graphic->aspect_vertical = 3;
graphic->aspect_horizontal = 1;
break;
case 3:
case 4:
graphic->aspect_vertical = 2;
graphic->aspect_horizontal = 1;
break;
case 5:
case 6:
graphic->aspect_vertical = 2;
graphic->aspect_horizontal = 1;
break;
case 7:
case 8:
case 9:
graphic->aspect_vertical = 1;
graphic->aspect_horizontal = 1;
break;
default:
TRACE(("DATA_ERROR: unknown sixel macro mode parameter\n"));
return;
}
break;
case 0:
break;
default:
TRACE(("DATA_ERROR: unexpected parameter count (found %d)\n", params->a_nparam));
return;
}
if (Pbgmode == 1) {
graphic->background = COLOR_HOLE;
} else {
graphic->background = graphic->device_background;
}
/* Ignore the grid parameter because it seems only printers paid attention to it.
* The VT3xx was always 0.0195 cm.
*/
}
#if OPT_SIXEL_GRAPHICS
if (xw->keyboard.flags & MODE_DECSDM) {
TRACE(("sixel scrolling enabled: inline positioning for graphic\n"));
graphic->charrow = screen->cur_row;
graphic->charcol = screen->cur_col;
}
update_sixel_aspect(graphic);
#endif
for (;;) {
ch = CharOf(*string);
if (ch == '\0')
break;
if (ch >= 0x3f && ch <= 0x7e) {
int sixel = ch - 0x3f;
TRACE(("sixel=%x (%c)\n", sixel, (char) ch));
if (!graphic->valid) {
init_sixel_background(graphic);
graphic->valid = 1;
}
set_sixel(graphic, sixel);
graphic->col++;
} else if (ch == '$') { /* DECGCR */
/* ignore DECCRNLM in sixel mode */
TRACE(("sixel CR\n"));
graphic->col = 0;
} else if (ch == '-') { /* DECGNL */
int scroll_lines;
TRACE(("sixel NL\n"));
scroll_lines = 0;
while (graphic->charrow - scroll_lines +
(((graphic->row + 6) * graphic->pixh
+ FontHeight(screen) - 1)
/ FontHeight(screen)) > screen->bot_marg) {
scroll_lines++;
}
graphic->col = 0;
graphic->row += 6;
/* If we hit the bottom margin on the graphics page (well, we just use the text margin for now),
* the behavior is to either scroll or to discard the remainder of the graphic depending on this
* setting.
*/
if (scroll_lines > 0) {
if (xw->keyboard.flags & MODE_DECSDM) {
Display *display = screen->display;
xtermScroll(xw, scroll_lines);
XSync(display, False);
TRACE(("graphic scrolled the screen %d lines. screen->scroll_amt=%d screen->topline=%d, now starting row is %d\n",
scroll_lines,
screen->scroll_amt,
screen->topline,
graphic->charrow));
} else {
break;
}
}
} else if (ch == '!') { /* DECGRI */
int Pcount;
const char *start;
int sixel;
int i;
start = ++string;
for (;;) {
ch = CharOf(*string);
if (ch != '0' &&
ch != '1' &&
ch != '2' &&
ch != '3' &&
ch != '4' &&
ch != '5' &&
ch != '6' &&
ch != '7' &&
ch != '8' &&
ch != '9' &&
ch != ' ' &&
ch != '\r' &&
ch != '\n')
break;
string++;
}
if (ch == '\0') {
TRACE(("DATA_ERROR: sixel data string terminated in the middle of a repeat operator\n"));
return;
}
if (string == start) {
TRACE(("DATA_ERROR: sixel data string contains a repeat operator with empty count\n"));
return;
}
Pcount = atoi(start);
sixel = ch - 0x3f;
TRACE(("sixel repeat operator: sixel=%d (%c), count=%d\n",
sixel, (char) ch, Pcount));
if (!graphic->valid) {
init_sixel_background(graphic);
graphic->valid = 1;
}
for (i = 0; i < Pcount; i++) {
set_sixel(graphic, sixel);
graphic->col++;
}
} else if (ch == '#') { /* DECGCI */
ANSI color_params;
int Pregister;
parse_prefixedtype_params(&color_params, &string);
Pregister = color_params.a_param[0];
if (Pregister >= graphic->valid_registers) {
TRACE(("DATA_WARNING: sixel color operator uses out-of-range register %d\n", Pregister));
/* FIXME: supposedly the DEC terminals wrapped register indicies -- verify */
while (Pregister >= graphic->valid_registers)
Pregister -= graphic->valid_registers;
TRACE(("DATA_WARNING: converted to %d\n", Pregister));
}
if (color_params.a_nparam > 2 && color_params.a_nparam <= 5) {
int Pspace = color_params.a_param[1];
int Pc1 = color_params.a_param[2];
int Pc2 = color_params.a_param[3];
int Pc3 = color_params.a_param[4];
short r, g, b;
TRACE(("sixel set color register=%d space=%d color=[%d,%d,%d] (nparams=%d)\n",
Pregister, Pspace, Pc1, Pc2, Pc3, color_params.a_nparam));
switch (Pspace) {
case 1: /* HLS */
if (Pc1 > 360 || Pc2 > 100 || Pc3 > 100) {
TRACE(("DATA_ERROR: sixel set color operator uses out-of-range HLS color coordinates %d,%d,%d\n",
Pc1, Pc2, Pc3));
return;
}
hls2rgb(Pc1, Pc2, Pc3, &r, &g, &b);
break;
case 2: /* RGB */
if (Pc1 > 100 || Pc2 > 100 || Pc3 > 100) {
TRACE(("DATA_ERROR: sixel set color operator uses out-of-range RGB color coordinates %d,%d,%d\n",
Pc1, Pc2, Pc3));
return;
}
r = (short) Pc1;
g = (short) Pc2;
b = (short) Pc3;
break;
default: /* unknown */
TRACE(("DATA_ERROR: sixel set color operator uses unknown color space %d\n", Pspace));
return;
}
if (graphic->private_colors) {
set_sixel_color_register(graphic->private_color_registers,
Pregister,
r, g, b);
} else {
set_shared_color_register(Pregister, r, g, b);
}
graphic->color_registers_used[Pregister] = 1;
} else if (color_params.a_nparam == 1) {
TRACE(("sixel switch to color register=%d (nparams=%d)\n",
Pregister, color_params.a_nparam));
graphic->current_register = (RegisterNum) Pregister;
} else {
TRACE(("DATA_ERROR: sixel switch color operator with unexpected parameter count (nparams=%d)\n", color_params.a_nparam));
return;
}
continue;
} else if (ch == '"') /* DECGRA */ {
ANSI raster_params;
parse_prefixedtype_params(&raster_params, &string);
if (raster_params.a_nparam < 2) {
TRACE(("DATA_ERROR: sixel raster attribute operator with incomplete parameters (found %d, expected 2 or 4)\n", raster_params.a_nparam));
return;
} {
int Pan = raster_params.a_param[0];
int Pad = raster_params.a_param[1];
TRACE(("sixel raster attribute with h:w=%d:%d\n", Pan, Pad));
if (Pan == 0 || Pad == 0) {
TRACE(("DATA_ERROR: invalid raster ratio %d/%d\n", Pan, Pad));
return;
}
graphic->aspect_vertical = Pan;
graphic->aspect_horizontal = Pad;
update_sixel_aspect(graphic);
}
if (raster_params.a_nparam >= 4) {
int Ph = raster_params.a_param[2];
int Pv = raster_params.a_param[3];
TRACE(("sixel raster attribute with h=%d v=%d\n", Ph, Pv));
if (Ph == 0 || Pv == 0) {
TRACE(("DATA_ERROR: raster image dimensions are invalid %dx%d\n",
Ph, Pv));
return;
}
if (Ph > graphic->max_width || Pv > graphic->max_height) {
TRACE(("DATA_ERROR: raster image dimensions are too large %dx%d\n",
Ph, Pv));
return;
}
graphic->declared_width = Ph;
graphic->declared_height = Pv;
if (graphic->declared_width > graphic->actual_width) {
graphic->actual_width = graphic->declared_width;
}
if (graphic->declared_height > graphic->actual_height) {
graphic->actual_height = graphic->declared_height;
}
}
continue;
} else if (ch == ' ' || ch == '\r' || ch == '\n') {
/* EMPTY */ ;
} else {
TRACE(("DATA_ERROR: unknown sixel command %04x (%c)\n",
(int) ch, ch));
}
string++;
}
/* update the screen */
if (screen->scroll_amt)
FlushScroll(xw);
if (xw->keyboard.flags & MODE_DECSDM) {
int new_row = (graphic->charrow
+ ((graphic->actual_height * graphic->pixh)
/ FontHeight(screen)));
int new_col = (graphic->charcol
+ (((graphic->actual_width * graphic->pixw)
+ FontWidth(screen) - 1)
/ FontWidth(screen)));
TRACE(("setting text position after %dx%d graphic starting on row=%d col=%d: cursor new_row=%d new_col=%d\n",
graphic->actual_width * graphic->pixw,
graphic->actual_height * graphic->pixh,
graphic->charrow,
graphic->charcol,
new_row, new_col));
if (new_col > screen->rgt_marg) {
new_col = screen->lft_marg;
new_row++;
TRACE(("column past left margin, overriding to row=%d col=%d\n",
new_row, new_col));
}
while (new_row > screen->bot_marg) {
xtermScroll(xw, 1);
new_row--;
TRACE(("bottom row was past screen. new start row=%d, cursor row=%d\n",
graphic->charrow, new_row));
}
if (new_row < 0) {
TRACE(("new row is going to be negative (%d)!", new_row)); /* FIXME: this was triggering, now it isn't */
}
set_cur_row(screen, new_row);
set_cur_col(screen, new_col <= screen->rgt_marg ? new_col : screen->rgt_marg);
}
refresh_modified_displayed_graphics(screen);
TRACE(("DONE successfully parsed sixel data\n"));
dump_sixel(graphic);
}
extern void
parse_regis(XtermWidget xw, ANSI *params, char const *string)
{
(void) xw;
(void) string;
(void) params;
TRACE(("ReGIS vector graphics mode, params=%d\n", params->a_nparam));
}
/* Erase the portion of any displayed graphic overlapping with a rectangle
* of the given size and location in pixels.
* This is used to allow text to "erase" graphics underneath it.
*/
static void
erase_sixel_graphic(SixelGraphic *graphic, int x, int y, int w, int h)
{
RegisterNum hole = COLOR_HOLE;
int pw, ph;
int r, c;
pw = graphic->pixw;
ph = graphic->pixh;
TRACE(("erasing sixel bitmap %d,%d %dx%d\n", x, y, w, h));
for (r = 0; r < graphic->actual_height; r++) {
for (c = 0; c < graphic->actual_width; c++) {
if (r * ph + ph - 1 < y ||
r * ph > y + h - 1 ||
c * pw + pw - 1 < x ||
c * pw > x + w - 1)
continue;
graphic->pixels[r * graphic->max_width + c] = hole;
}
}
}
static int
compare_sixel_ids(const void *left, const void *right)
{
const SixelGraphic *l = *(const SixelGraphic *const *) left;
const SixelGraphic *r = *(const SixelGraphic *const *) right;
if (!l->valid || !r->valid)
return 0;
if (l->id < r->id)
return -1;
else
return 1;
}
extern void
refresh_displayed_graphics(TScreen const *screen,
int leftcol,
int toprow,
int ncols,
int nrows)
{
SixelGraphic *ordered_graphics[MAX_SIXEL_GRAPHICS];
SixelGraphic *graphic;
unsigned int ii;
int x, y, w, h;
int xbase, ybase;
for (ii = 0U; ii < MAX_SIXEL_GRAPHICS; ii++) {
ordered_graphics[ii] = &sixel_graphics[ii];
}
qsort(ordered_graphics,
(size_t) MAX_SIXEL_GRAPHICS,
sizeof(ordered_graphics[0]),
compare_sixel_ids);
for (ii = 0U; ii < MAX_SIXEL_GRAPHICS; ii++) {
graphic = ordered_graphics[ii];
if (!graphic->valid || graphic->bufferid != screen->whichBuf)
continue;
x = (leftcol - graphic->charcol) * FontWidth(screen);
y = (toprow - graphic->charrow) * FontHeight(screen);
w = ncols * FontWidth(screen);
h = nrows * FontHeight(screen);
xbase = (OriginX(screen)
+ graphic->charcol * FontWidth(screen));
ybase = (OriginY(screen)
+ (graphic->charrow - screen->topline) * FontHeight(screen));
if (xbase + x + w + OriginX(screen) > FullWidth(screen))
w = FullWidth(screen) - (xbase + x + OriginX(screen));
if (ybase + y + h + OriginY(screen) > FullHeight(screen))
h = FullHeight(screen) - (ybase + y + OriginY(screen));
else if (ybase + y < OriginY(screen)) {
int diff = OriginY(screen) - (ybase + y);
y += diff;
h -= diff;
}
TRACE(("graphics refresh: screen->topline=%d leftcol=%d toprow=%d nrows=%d ncols=%d x=%d y=%d w=%d h=%d xbase=%d ybase=%d\n",
screen->topline,
leftcol, toprow,
nrows, ncols,
x, y, w, h,
xbase, ybase));
refresh_sixel_graphic(screen, graphic, xbase, ybase, x, y, w, h);
}
}
extern void
refresh_modified_displayed_graphics(TScreen const *screen)
{
SixelGraphic *graphic;
unsigned int ii;
int leftcol, toprow;
int nrows, ncols;
int x, y, w, h;
int xbase, ybase;
for (ii = 0U; ii < MAX_SIXEL_GRAPHICS; ii++) {
graphic = &sixel_graphics[ii];
if (!graphic->valid || graphic->bufferid != screen->whichBuf || !graphic->dirty)
continue;
leftcol = graphic->charcol;
toprow = graphic->charrow;
nrows = (((graphic->actual_height * graphic->pixh)
+ FontHeight(screen) - 1)
/ FontHeight(screen));
ncols = (((graphic->actual_width * graphic->pixw)
+ FontWidth(screen) - 1)
/ FontWidth(screen));
x = (leftcol - graphic->charcol) * FontWidth(screen);
y = (toprow - graphic->charrow) * FontHeight(screen);
w = ncols * FontWidth(screen);
h = nrows * FontHeight(screen);
xbase = (OriginX(screen)
+ graphic->charcol * FontWidth(screen));
ybase = (OriginY(screen)
+ (graphic->charrow - screen->topline) * FontHeight(screen));
if (xbase + x + w + OriginX(screen) > FullWidth(screen))
w = FullWidth(screen) - (xbase + x + OriginX(screen));
if (ybase + y + h + OriginY(screen) > FullHeight(screen))
h = FullHeight(screen) - (ybase + y + OriginY(screen));
else if (ybase + y < OriginY(screen)) {
int diff = OriginY(screen) - (ybase + y);
y += diff;
h -= diff;
}
TRACE(("full graphics refresh: screen->topline=%d leftcol=%d toprow=%d nrows=%d ncols=%d x=%d y=%d w=%d h=%d xbase=%d ybase=%d\n",
screen->topline,
leftcol, toprow,
nrows, ncols,
x, y, w, h,
xbase, ybase));
refresh_sixel_graphic(screen, graphic, xbase, ybase, x, y, w, h);
graphic->dirty = 0;
}
}
extern void
scroll_displayed_graphics(int rows)
{
SixelGraphic *graphic;
unsigned int ii;
TRACE(("graphics scroll: moving all up %d rows\n", rows));
for (ii = 0U; ii < MAX_SIXEL_GRAPHICS; ii++) {
graphic = &sixel_graphics[ii];
if (!graphic->valid)
continue;
graphic->charrow -= rows;
}
}
extern void
pixelarea_clear_displayed_graphics(TScreen const *screen,
int winx,
int winy,
int w,
int h)
{
SixelGraphic *graphic;
unsigned int ii;
int x, y;
for (ii = 0U; ii < MAX_SIXEL_GRAPHICS; ii++) {
graphic = &sixel_graphics[ii];
if (!graphic->valid)
continue;
x = winx - graphic->charcol * FontWidth(screen);
y = winy - graphic->charrow * FontHeight(screen);
TRACE(("pixelarea graphics erase: screen->topline=%d winx=%d winy=%d w=%d h=%d x=%d y=%d\n",
screen->topline,
winx, winy,
w, h,
x, y));
erase_sixel_graphic(graphic, x, y, w, h);
}
}
extern void
chararea_clear_displayed_graphics(TScreen const *screen,
int leftcol,
int toprow,
int ncols,
int nrows)
{
int x, y, w, h;
x = leftcol * FontWidth(screen);
y = toprow * FontHeight(screen);
w = ncols * FontWidth(screen);
h = nrows * FontHeight(screen);
TRACE(("chararea clear graphics: screen->topline=%d leftcol=%d toprow=%d nrows=%d ncols=%d x=%d y=%d w=%d h=%d\n",
screen->topline,
leftcol, toprow,
nrows, ncols,
x, y, w, h));
pixelarea_clear_displayed_graphics(screen, x, y, w, h);
}
extern void
reset_displayed_graphics(TScreen const *screen)
{
SixelGraphic *graphic;
unsigned int ii;
init_color_registers(shared_color_registers, screen->terminal_id);
TRACE(("resetting all sixel graphics\n"));
for (ii = 0U; ii < MAX_SIXEL_GRAPHICS; ii++) {
graphic = &sixel_graphics[ii];
graphic->valid = 0;
}
}
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