added draw.h, draw.c
This commit is contained in:
Connor Lane Smith
parent
22d8818850
commit
e7d41cc188
176
draw.c
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176
draw.c
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/* See LICENSE file for copyright and license details. */
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#include <locale.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <X11/Xlib.h>
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#include "draw.h"
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#define MAX(a, b) ((a) > (b) ? (a) : (b))
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#define MIN(a, b) ((a) < (b) ? (a) : (b))
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#define DEFAULTFN "fixed"
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static Bool loadfont(DC *dc, const char *fontstr);
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void
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drawrect(DC *dc, int x, int y, unsigned int w, unsigned int h, Bool fill, unsigned long color) {
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XSetForeground(dc->dpy, dc->gc, color);
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if(fill)
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XFillRectangle(dc->dpy, dc->canvas, dc->gc, dc->x + x, dc->y + y, w, h);
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else
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XDrawRectangle(dc->dpy, dc->canvas, dc->gc, dc->x + x, dc->y + y, w-1, h-1);
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}
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void
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drawtext(DC *dc, const char *text, unsigned long col[ColLast]) {
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char buf[BUFSIZ];
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size_t mn, n = strlen(text);
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/* shorten text if necessary */
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for(mn = MIN(n, sizeof buf); textnw(dc, text, mn) + dc->font.height/2 > dc->w; mn--)
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if(mn == 0)
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return;
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memcpy(buf, text, mn);
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if(mn < n)
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for(n = MAX(mn-3, 0); n < mn; buf[n++] = '.');
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drawrect(dc, 0, 0, dc->w, dc->h, True, BG(dc, col));
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drawtextn(dc, buf, mn, col);
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}
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void
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drawtextn(DC *dc, const char *text, size_t n, unsigned long col[ColLast]) {
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int x = dc->x + dc->font.height/2;
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int y = dc->y + dc->font.ascent+1;
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XSetForeground(dc->dpy, dc->gc, FG(dc, col));
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if(dc->font.set)
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XmbDrawString(dc->dpy, dc->canvas, dc->font.set, dc->gc, x, y, text, n);
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else {
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XSetFont(dc->dpy, dc->gc, dc->font.xfont->fid);
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XDrawString(dc->dpy, dc->canvas, dc->gc, x, y, text, n);
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}
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}
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void
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eprintf(const char *fmt, ...) {
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va_list ap;
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va_start(ap, fmt);
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vfprintf(stderr, fmt, ap);
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va_end(ap);
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if(fmt[0] != '\0' && fmt[strlen(fmt)-1] == ':') {
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fputc(' ', stderr);
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perror(NULL);
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}
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exit(EXIT_FAILURE);
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}
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void
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freedc(DC *dc) {
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if(dc->font.set)
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XFreeFontSet(dc->dpy, dc->font.set);
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if(dc->font.xfont)
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XFreeFont(dc->dpy, dc->font.xfont);
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if(dc->canvas)
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XFreePixmap(dc->dpy, dc->canvas);
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XFreeGC(dc->dpy, dc->gc);
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XCloseDisplay(dc->dpy);
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free(dc);
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}
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unsigned long
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getcolor(DC *dc, const char *colstr) {
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Colormap cmap = DefaultColormap(dc->dpy, DefaultScreen(dc->dpy));
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XColor color;
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if(!XAllocNamedColor(dc->dpy, cmap, colstr, &color, &color))
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eprintf("cannot allocate color '%s'\n", colstr);
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return color.pixel;
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}
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DC *
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initdc(void) {
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DC *dc;
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if(!setlocale(LC_CTYPE, "") || !XSupportsLocale())
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fprintf(stderr, "no locale support\n");
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if(!(dc = calloc(1, sizeof *dc)))
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eprintf("cannot malloc %u bytes:", sizeof *dc);
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if(!(dc->dpy = XOpenDisplay(NULL)))
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eprintf("cannot open display\n");
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dc->gc = XCreateGC(dc->dpy, DefaultRootWindow(dc->dpy), 0, NULL);
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XSetLineAttributes(dc->dpy, dc->gc, 1, LineSolid, CapButt, JoinMiter);
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return dc;
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}
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void
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initfont(DC *dc, const char *fontstr) {
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if(!loadfont(dc, fontstr ? fontstr : DEFAULTFN)) {
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if(fontstr != NULL)
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fprintf(stderr, "cannot load font '%s'\n", fontstr);
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if(fontstr == NULL || !loadfont(dc, DEFAULTFN))
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eprintf("cannot load font '%s'\n", DEFAULTFN);
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}
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dc->font.height = dc->font.ascent + dc->font.descent;
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}
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Bool
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loadfont(DC *dc, const char *fontstr) {
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char *def, **missing, **names;
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int i, n = 1;
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XFontStruct **xfonts;
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if(!*fontstr)
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return False;
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if((dc->font.set = XCreateFontSet(dc->dpy, fontstr, &missing, &n, &def))) {
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n = XFontsOfFontSet(dc->font.set, &xfonts, &names);
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}
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else {
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dc->font.xfont = XLoadQueryFont(dc->dpy, fontstr);
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xfonts = &dc->font.xfont;
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}
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for(i = 0; i < n; i++) {
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dc->font.ascent = MAX(dc->font.ascent, xfonts[i]->ascent);
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dc->font.descent = MAX(dc->font.descent, xfonts[i]->descent);
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dc->font.width = MAX(dc->font.width, xfonts[i]->max_bounds.width);
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}
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if(missing)
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XFreeStringList(missing);
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return (dc->font.set || dc->font.xfont);
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}
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void
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mapdc(DC *dc, Window win, unsigned int w, unsigned int h) {
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XCopyArea(dc->dpy, dc->canvas, win, dc->gc, 0, 0, w, h, 0, 0);
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}
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void
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resizedc(DC *dc, unsigned int w, unsigned int h) {
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if(dc->canvas)
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XFreePixmap(dc->dpy, dc->canvas);
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dc->canvas = XCreatePixmap(dc->dpy, DefaultRootWindow(dc->dpy), w, h,
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DefaultDepth(dc->dpy, DefaultScreen(dc->dpy)));
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dc->w = w;
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dc->h = h;
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}
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int
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textnw(DC *dc, const char *text, size_t len) {
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if(dc->font.set) {
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XRectangle r;
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XmbTextExtents(dc->font.set, text, len, NULL, &r);
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return r.width;
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}
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return XTextWidth(dc->font.xfont, text, len);
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}
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int
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textw(DC *dc, const char *text) {
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return textnw(dc, text, strlen(text)) + dc->font.height;
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}
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35
draw.h
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35
draw.h
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@ -0,0 +1,35 @@
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/* See LICENSE file for copyright and license details. */
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#define FG(dc, col) ((col)[(dc)->invert ? ColBG : ColFG])
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#define BG(dc, col) ((col)[(dc)->invert ? ColFG : ColBG])
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enum { ColBG, ColFG, ColBorder, ColLast };
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typedef struct {
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int x, y, w, h;
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Bool invert;
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Display *dpy;
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GC gc;
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Pixmap canvas;
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struct {
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int ascent;
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int descent;
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int height;
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int width;
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XFontSet set;
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XFontStruct *xfont;
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} font;
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} DC; /* draw context */
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void drawrect(DC *dc, int x, int y, unsigned int w, unsigned int h, Bool fill, unsigned long color);
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void drawtext(DC *dc, const char *text, unsigned long col[ColLast]);
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void drawtextn(DC *dc, const char *text, size_t n, unsigned long col[ColLast]);
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void eprintf(const char *fmt, ...);
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void freedc(DC *dc);
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unsigned long getcolor(DC *dc, const char *colstr);
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DC *initdc(void);
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void initfont(DC *dc, const char *fontstr);
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void mapdc(DC *dc, Window win, unsigned int w, unsigned int h);
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void resizedc(DC *dc, unsigned int w, unsigned int h);
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int textnw(DC *dc, const char *text, size_t len);
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int textw(DC *dc, const char *text);
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