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sixel: add support for fully transparent bg (P2=1) (#132) 

P2 selects how the terminal draws the background color.

P2                  Meaning
0 or 2 (default)    Pixel positions specified as 0 are set to the
                    current background color.
1                   Pixel positions specified as 0 remain at their
                    current color.

Both modes are now supported.

Ref. https://www.vt100.net/docs/vt3xx-gp/chapter14.html
This commit is contained in:
veltza 2024-04-17 19:04:27 +03:00 committed by GitHub
parent dd8675943d
commit 118e965d0c
No known key found for this signature in database
GPG Key ID: B5690EEEBB952194
6 changed files with 85 additions and 33 deletions
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15
patch/reflow.c
View File

@ -81,7 +81,7 @@ treflow(int col, int row)
int oce, nce, bot, scr;
int ox = 0, oy = -term.histf, nx = 0, ny = -1, len;
int cy = -1; /* proxy for new y coordinate of cursor */
int buflen, nlines, del;
int buflen, nlines;
Line *buf, bufline, line;
#if SIXEL_PATCH
ImageList *im, *next;
@ -219,21 +219,14 @@ treflow(int col, int row)
}
}
/* expand images into new text cells or
* delete images if there is text behind them */
/* expand images into new text cells */
for (im = term.images; im; im = next) {
next = im->next;
if (im->x < col) {
line = TLINE(im->y);
x2 = MIN(im->x + im->cols, col);
for (del = 0, x = im->x; x < x2; x++) {
if ((del = line[x].mode & ATTR_SET))
break;
line[x].u = ' ';
line[x].mode = ATTR_SIXEL;
}
if (del)
delete_image(im);
for (x = im->x; x < x2; x++)
line[x].mode |= ATTR_SIXEL;
}
}
#endif // SIXEL_PATCH

40
sixel.c
View File

@ -66,6 +66,8 @@ delete_image(ImageList *im)
im->next->prev = im->prev;
if (im->pixmap)
XFreePixmap(xw.dpy, (Drawable)im->pixmap);
if (im->clipmask)
XFreePixmap(xw.dpy, (Drawable)im->clipmask);
free(im->pixels);
free(im);
}
@ -217,6 +219,7 @@ sixel_image_deinit(sixel_image_t *image)
int
sixel_parser_init(sixel_state_t *st,
int transparent,
sixel_color_t fgcolor, sixel_color_t bgcolor,
unsigned char use_private_register,
int cell_width, int cell_height)
@ -232,6 +235,7 @@ sixel_parser_init(sixel_state_t *st,
st->attributed_pad = 1;
st->attributed_ph = 0;
st->attributed_pv = 0;
st->transparent = transparent;
st->repeat_count = 1;
st->color_index = 16;
st->grid_width = cell_width;
@ -240,7 +244,7 @@ sixel_parser_init(sixel_state_t *st,
st->param = 0;
/* buffer initialization */
status = sixel_image_init(&st->image, 1, 1, fgcolor, bgcolor, use_private_register);
status = sixel_image_init(&st->image, 1, 1, fgcolor, transparent ? 0 : bgcolor, use_private_register);
return status;
}
@ -304,8 +308,10 @@ sixel_parser_finalize(sixel_state_t *st, ImageList **newimages, int cx, int cy,
im->height = MIN(h - ch * i, ch);
im->pixels = malloc(im->width * im->height * 4);
im->pixmap = NULL;
im->clipmask = NULL;
im->cw = cw;
im->ch = ch;
im->transparent = st->transparent;
}
if (!im || !im->pixels) {
for (im = *newimages; im; im = next) {
@ -652,3 +658,35 @@ sixel_parser_deinit(sixel_state_t *st)
if (st)
sixel_image_deinit(&st->image);
}
Pixmap
sixel_create_clipmask(char *pixels, int width, int height)
{
char c, *clipdata, *dst;
int b, i, n, y, w;
int msb = (XBitmapBitOrder(xw.dpy) == MSBFirst);
sixel_color_t *src = (sixel_color_t *)pixels;
Pixmap clipmask;
clipdata = dst = malloc((width+7)/8 * height);
if (!clipdata)
return (Pixmap)None;
for (y = 0; y < height; y++) {
for (w = width; w > 0; w -= n) {
n = MIN(w, 8);
if (msb) {
for (b = 0x80, c = 0, i = 0; i < n; i++, b >>= 1)
c |= (*src++) ? b : 0;
} else {
for (b = 0x01, c = 0, i = 0; i < n; i++, b <<= 1)
c |= (*src++) ? b : 0;
}
*dst++ = c;
}
}
clipmask = XCreateBitmapFromData(xw.dpy, xw.win, clipdata, width, height);
free(clipdata);
return clipmask;
}

4
sixel.h
View File

@ -39,6 +39,7 @@ typedef struct parser_context {
int attributed_pad;
int attributed_ph;
int attributed_pv;
int transparent;
int repeat_count;
int color_index;
int bgindex;
@ -52,10 +53,11 @@ typedef struct parser_context {
void scroll_images(int n);
void delete_image(ImageList *im);
int sixel_parser_init(sixel_state_t *st, sixel_color_t fgcolor, sixel_color_t bgcolor, unsigned char use_private_register, int cell_width, int cell_height);
int sixel_parser_init(sixel_state_t *st, int transparent, sixel_color_t fgcolor, sixel_color_t bgcolor, unsigned char use_private_register, int cell_width, int cell_height);
int sixel_parser_parse(sixel_state_t *st, const unsigned char *p, size_t len);
int sixel_parser_set_default_color(sixel_state_t *st);
int sixel_parser_finalize(sixel_state_t *st, ImageList **newimages, int cx, int cy, int cw, int ch);
void sixel_parser_deinit(sixel_state_t *st);
Pixmap sixel_create_clipmask(char *pixels, int width, int height);
#endif

32
st.c
View File

@ -2714,14 +2714,18 @@ strhandle(void)
y1 = newimages->y;
x2 = x1 + newimages->cols;
y2 = y1 + numimages;
for (tail = NULL, im = term.images; im; im = next) {
next = im->next;
if (im->x >= x1 && im->x + im->cols <= x2 &&
im->y >= y1 && im->y <= y2) {
delete_image(im);
continue;
if (newimages->transparent) {
for (tail = term.images; tail && tail->next; tail = tail->next);
} else {
for (tail = NULL, im = term.images; im; im = next) {
next = im->next;
if (im->x >= x1 && im->x + im->cols <= x2 &&
im->y >= y1 && im->y <= y2) {
delete_image(im);
continue;
}
tail = im;
}
tail = im;
}
if (tail) {
tail->next = newimages;
@ -2747,8 +2751,7 @@ strhandle(void)
line = term.line[term.c.y];
}
for (x = im->x; x < x2; x++) {
line[x].u = ' ';
line[x].mode = ATTR_SIXEL;
line[x].mode |= ATTR_SIXEL;
}
term.dirty[MIN(im->y, term.row-1)] = 1;
if (!IS_SET(MODE_SIXEL_SDM) && i < numimages-1) {
@ -3097,7 +3100,7 @@ tcontrolcode(uchar ascii)
void
dcshandle(void)
{
int bgcolor;
int bgcolor, transparent;
unsigned char r, g, b, a = 255;
switch (csiescseq.mode[0]) {
@ -3119,6 +3122,7 @@ dcshandle(void)
break;
#endif // SYNC_PATCH
case 'q': /* DECSIXEL */
transparent = (csiescseq.narg >= 2 && csiescseq.arg[1] == 1);
if (IS_TRUECOL(term.c.attr.bg)) {
r = term.c.attr.bg >> 16 & 255;
g = term.c.attr.bg >> 8 & 255;
@ -3129,7 +3133,7 @@ dcshandle(void)
a = dc.col[defaultbg].pixel >> 24 & 255;
}
bgcolor = a << 24 | r << 16 | g << 8 | b;
if (sixel_parser_init(&sixel_st, (255 << 24), bgcolor, 1, win.cw, win.ch) != 0)
if (sixel_parser_init(&sixel_st, transparent, (255 << 24), bgcolor, 1, win.cw, win.ch) != 0)
perror("sixel_parser_init() failed");
term.mode |= MODE_SIXEL;
break;
@ -3632,10 +3636,8 @@ tresize(int col, int row)
line = term.line[im->y];
#endif // SCROLLBACK_PATCH
x2 = MIN(im->x + im->cols, term.col);
for (x = im->x; x < x2; x++) {
line[x].u = ' ';
line[x].mode = ATTR_SIXEL;
}
for (x = im->x; x < x2; x++)
line[x].mode |= ATTR_SIXEL;
}
tswapscreen();
}

2
st.h
View File

@ -77,6 +77,7 @@ typedef struct _ImageList {
struct _ImageList *next, *prev;
unsigned char *pixels;
void *pixmap;
void *clipmask;
int width;
int height;
int x;
@ -87,6 +88,7 @@ typedef struct _ImageList {
int cols;
int cw;
int ch;
int transparent;
} ImageList;
#endif // SIXEL_PATCH

25
x.c
View File

@ -325,7 +325,10 @@ zoomabs(const Arg *arg)
for (im = term.images; im; im = im->next) {
if (im->pixmap)
XFreePixmap(xw.dpy, (Drawable)im->pixmap);
if (im->clipmask)
XFreePixmap(xw.dpy, (Drawable)im->clipmask);
im->pixmap = NULL;
im->clipmask = NULL;
}
#endif // SIXEL_PATCH
@ -3138,7 +3141,7 @@ xfinishdraw(void)
XGCValues gcvalues;
GC gc;
int width, height;
int x, x2, del;
int x, x2, del, destx, desty;
Line line;
#endif // SIXEL_PATCH
@ -3161,6 +3164,8 @@ xfinishdraw(void)
DefaultDepth(xw.dpy, xw.scr)
#endif // ALPHA_PATCH
);
if (!im->pixmap)
continue;
if (win.cw == im->cw && win.ch == im->ch) {
XImage ximage = {
.format = ZPixmap,
@ -3181,12 +3186,15 @@ xfinishdraw(void)
#endif // ALPHA_PATCH
};
XPutImage(xw.dpy, (Drawable)im->pixmap, dc.gc, &ximage, 0, 0, 0, 0, width, height);
if (im->transparent)
im->clipmask = (void *)sixel_create_clipmask((char *)im->pixels, width, height);
} else {
origin = imlib_create_image_using_data(im->width, im->height, (DATA32 *)im->pixels);
if (!origin)
continue;
imlib_context_set_image(origin);
imlib_image_set_has_alpha(1);
imlib_context_set_anti_alias(im->transparent ? 0 : 1); /* anti-aliasing messes up the clip mask */
scaled = imlib_create_cropped_scaled_image(0, 0, im->width, im->height, width, height);
imlib_free_image_and_decache();
if (!scaled)
@ -3212,6 +3220,8 @@ xfinishdraw(void)
#endif // ALPHA_PATCH
};
XPutImage(xw.dpy, (Drawable)im->pixmap, dc.gc, &ximage, 0, 0, 0, 0, width, height);
if (im->transparent)
im->clipmask = (void *)sixel_create_clipmask((char *)imlib_image_get_data_for_reading_only(), width, height);
imlib_free_image_and_decache();
}
}
@ -3240,12 +3250,17 @@ xfinishdraw(void)
gcvalues.graphics_exposures = False;
gc = XCreateGC(xw.dpy, xw.win, GCGraphicsExposures, &gcvalues);
#if ANYSIZE_PATCH
XCopyArea(xw.dpy, (Drawable)im->pixmap, xw.buf, gc, 0, 0,
width, height, win.hborderpx + im->x * win.cw, win.vborderpx + im->y * win.ch);
destx = win.hborderpx + im->x * win.cw;
desty = win.vborderpx + im->y * win.ch;
#else
XCopyArea(xw.dpy, (Drawable)im->pixmap, xw.buf, gc, 0, 0,
width, height, borderpx + im->x * win.cw, borderpx + im->y * win.ch);
destx = borderpx + im->x * win.cw;
desty = borderpx + im->y * win.ch;
#endif // ANYSIZE_PATCH
if (im->clipmask) {
XSetClipMask(xw.dpy, gc, (Drawable)im->clipmask);
XSetClipOrigin(xw.dpy, gc, destx, desty);
}
XCopyArea(xw.dpy, (Drawable)im->pixmap, xw.buf, gc, 0, 0, width, height, destx, desty);
XFreeGC(xw.dpy, gc);
}
#endif // SIXEL_PATCH