Add more realistic example

examples/stupidterm.c

@@ -0,0 +1,205 @@
+/* See LICENSE file for copyright and license details. */
+
+#include <assert.h>
+#include <stdint.h>
+
+#include <X11/Xlib.h>
+#include <X11/keysym.h>
+#include <X11/extensions/Xrender.h>
+
+#include <ft2build.h>
+#include FT_FREETYPE_H
+
+#include "dtext.h"
+
+// Configuration
+
+char const *font =
+	"/usr/share/fonts/fantasque-sans-mono/FantasqueSansMono-Regular.otf:16;"
+	"/usr/share/fonts/powerline-symbols/PowerlineSymbols.otf:14;"
+	"/usr/share/fonts/dejavu/DejaVuSansMono.ttf:16";
+char const *fontb =
+	"/usr/share/fonts/fantasque-sans-mono/FantasqueSansMono-Bold.otf:16;"
+	"/usr/share/fonts/powerline-symbols/PowerlineSymbols.otf:14;"
+	"/usr/share/fonts/dejavu/DejaVuSansMono-Bold.ttf:16";
+char const *fonti =
+	"/usr/share/fonts/fantasque-sans-mono/FantasqueSansMono-RegItalic.otf:16;"
+	"/usr/share/fonts/powerline-symbols/PowerlineSymbols.otf:14;"
+	"/usr/share/fonts/dejavu/DejaVuSansMono-Oblique.ttf:16";
+char const *fontbi =
+	"/usr/share/fonts/fantasque-sans-mono/FantasqueSansMono-BoldItalic.otf:16;"
+	"/usr/share/fonts/powerline-symbols/PowerlineSymbols.otf:14;"
+	"/usr/share/fonts/dejavu/DejaVuSansMono-BoldOblique.ttf:16";
+
+// Fantasque is good for testing: its reported height is far too big, so it
+// allows testing the boringness of tuning the scales
+float chscale = 1.f; // horizontal scale
+float cvscale = .51f; // vertical scale
+float cascale = .482f; // ascender scale
+
+// \f1: toggle bold
+// \f2: toggle italics
+// \f3??????: change fgcolor to ?????? (RGB format)
+// \f4??????: change bgcolor to ?????? (RGB format)
+wchar_t const *text =
+	L"Lorem ipsum dolor sit amet, consectetur adipiscing elit.\n"
+	L"Donec a diam lectus. \f1Sed sit amet ipsum mauris.\f1\n"
+	L"\f2Maecenas\f2 congue ligula ac \f1\f2quam viverra nec\f1\f2\n"
+	L"consectetur ante hendrerit. \f300FF00Donec et mollis dolor.\f3000000\n"
+	L"Praesent \f4FF0000et \f1diam \f2eget\f1 libero\f40000FF egestas\f2\f4FFFFFF\n"
+	L"mattis sit amet vitae augue.\n"
+	L"\n"
+	L"\f4000000\f3FF0000 \xe0a0 \f30000FF\x2699 \f3FFFFFFsome text \f3000000\f4FFFFFF This is a pseudo-prompt.\n";
+
+// Implementation
+
+Display *dpy;
+Window win;
+GC gc;
+Colormap cmap;
+
+dt_context *ctx;
+dt_font *fnt, *fntb, *fnti, *fntbi;
+dt_color color;
+
+static void setup_x();
+static void setup_dt();
+static void draw(wchar_t const *txt);
+
+int main()
+{
+	XEvent evt;
+
+	_Xdebug = 1;
+
+	setup_x();
+	setup_dt();
+
+	draw(text);
+
+	XSelectInput(dpy, win, ExposureMask | KeyPressMask);
+	while (1) {
+		XNextEvent(dpy, &evt);
+		switch (evt.type) {
+		case Expose:
+			draw(text);
+			break;
+		case KeyPress:
+			if (XLookupKeysym(&evt.xkey, 0) == XK_Escape)
+				return 0;
+			break;
+		}
+	}
+
+	dt_free(ctx, fnt);
+	dt_quit(ctx);
+	XCloseDisplay(dpy);
+}
+
+static void setup_x()
+{
+	unsigned long white, black;
+
+	dpy = XOpenDisplay(NULL);
+
+	white = XWhitePixel(dpy, DefaultScreen(dpy));
+	black = XBlackPixel(dpy, DefaultScreen(dpy));
+
+	win = XCreateSimpleWindow(dpy, DefaultRootWindow(dpy), 0, 0,
+	                          700, 500, 0, white, white);
+	XMapWindow(dpy, win);
+
+	gc = XDefaultGC(dpy, 0);
+	XSetForeground(dpy, gc, black);
+
+	cmap = DefaultColormap(dpy, 0);
+}
+
+static void setup_dt()
+{
+	assert(!dt_init(&ctx, dpy, win));
+
+	assert(!dt_load(ctx, &fnt, font));
+	assert(!dt_load(ctx, &fntb, fontb));
+	assert(!dt_load(ctx, &fnti, fonti));
+	assert(!dt_load(ctx, &fntbi, fontbi));
+
+	memset(&color, 0, sizeof(color));
+	color.alpha = 0xFF;
+}
+
+static void draw(wchar_t const *txt)
+{
+	dt_bbox bbox;
+	size_t x, y;
+	int bold, italics;
+	dt_font *curfnt;
+	dt_color fgcol;
+	XColor bgcol;
+	char color[8];
+	size_t i;
+
+	x = 0;
+	y = fnt->ascent * cascale;
+
+	bold = italics = 0;
+	curfnt = fnt;
+
+	memset(&fgcol, 0, sizeof(fgcol));
+	fgcol.alpha = 0xFF;
+
+	XParseColor(dpy, cmap, "#FFFFFF", &bgcol);
+	XAllocColor(dpy, cmap, &bgcol);
+	XSetForeground(dpy, gc, bgcol.pixel);
+
+	memset(color, 0, sizeof(color));
+	color[0] = '#';
+
+	while (*txt) {
+		if (*txt != L'\f' && *txt != L'\n') {
+			dt_box(ctx, curfnt, &bbox, txt, 1);
+			XFillRectangle(dpy, win, gc, x + bbox.x, y - curfnt->ascent * cascale, bbox.w, curfnt->height * cvscale);
+			dt_draw(ctx, curfnt, &fgcol, x, y, txt, 1);
+			x += bbox.w * chscale;
+		} else if (*txt == L'\n') {
+			x = 0;
+			y += curfnt->height * cvscale;
+		} else if (*txt == L'\f') {
+			++txt;
+			switch (*txt) {
+			case L'1':
+				bold = !bold;
+				break;
+			case L'2':
+				italics = !italics;
+				break;
+			case L'3':
+			case L'4':
+				for (i = 0; i < 6; ++i)
+					color[i + 1] = (char) txt[i + 1];
+				XParseColor(dpy, cmap, color, &bgcol);
+				if (*txt == L'3') {
+					fgcol.red = bgcol.red >> 8;
+					fgcol.green = bgcol.green >> 8;
+					fgcol.blue = bgcol.blue >> 8;
+				} else {
+					XAllocColor(dpy, cmap, &bgcol);
+					XSetForeground(dpy, gc, bgcol.pixel);
+				}
+				txt += 6;
+				break;
+			}
+			if (bold && italics)
+				curfnt = fntbi;
+			else if (bold)
+				curfnt = fntb;
+			else if (italics)
+				curfnt = fnti;
+			else
+				curfnt = fnt;
+		}
+		++txt;
+	}
+
+	XFlush(dpy);
+}