popup: place and bound the input panel

fn.h

@@ -48,3 +48,4 @@ void*	erealloc(void*, ulong);
 int	textinit(void);
 int	textwidth(Str*);
 void	textdraw(u32int*, int, int, int, int, Str*);
+void	textdrawfit(u32int*, int, int, int, int, int, Str*);

font.c

@@ -6,6 +6,13 @@ static PangoFontMap *fontmap;
 static PangoContext *context;
 static PangoLayout *layout;
 
+static void
+resetlayout(void)
+{
+	pango_layout_set_width(layout, -1);
+	pango_layout_set_ellipsize(layout, PANGO_ELLIPSIZE_NONE);
+}
+
 static void
 textclear(void)
 {
@@ -100,20 +107,32 @@ textwidth(Str *s)
 {
 	PangoRectangle r;
 
+	if(layout == nil)
+		return 0;
+	resetlayout();
 	if(!settext(s))
 		return 0;
 	textextents(&r);
 	return r.width;
 }
 
-void
+static void
-textdraw(u32int *buf, int w, int h, int x, int y, Str *s)
+drawtext(u32int *buf, int w, int h, int x, int y, int fit, Str *s)
 {
 	PangoRectangle r;
 	cairo_surface_t *surface;
 	cairo_t *cr;
 	int stride;
 
+	if(layout == nil)
+		return;
+	resetlayout();
+	if(fit != -1 && fit <= 0)
+		return;
+	if(fit > 0){
+		pango_layout_set_width(layout, fit * PANGO_SCALE);
+		pango_layout_set_ellipsize(layout, PANGO_ELLIPSIZE_END);
+	}
 	if(buf == nil || w <= 0 || h <= 0 || !settext(s))
 		return;
 	stride = cairo_format_stride_for_width(CAIRO_FORMAT_RGB24, w);
@@ -131,7 +150,10 @@ textdraw(u32int *buf, int w, int h, int x, int y, Str *s)
 		pango_cairo_update_layout(cr, layout);
 		textextents(&r);
 		/* A fallback face must not paint into another popup row. */
-		cairo_rectangle(cr, 0, y, w, Fontsz);
+		if(fit > 0)
+			cairo_rectangle(cr, x, y, fit, Fontsz);
+		else
+			cairo_rectangle(cr, 0, y, w, Fontsz);
 		cairo_clip(cr);
 		cairo_move_to(cr, x - r.x, y + (Fontsz - r.height) / 2 - r.y);
 		cairo_set_source_rgb(cr, 0, 0, 0);
@@ -141,3 +163,15 @@ textdraw(u32int *buf, int w, int h, int x, int y, Str *s)
 	cairo_surface_flush(surface);
 	cairo_surface_destroy(surface);
 }
+
+void
+textdraw(u32int *buf, int w, int h, int x, int y, Str *s)
+{
+	drawtext(buf, w, h, x, y, -1, s);
+}
+
+void
+textdrawfit(u32int *buf, int w, int h, int x, int y, int fit, Str *s)
+{
+	drawtext(buf, w, h, x, y, fit, s);
+}

popup_layout.c

@@ -5,11 +5,15 @@ void
 popupposition(Caret *caret, int pointerx, int pointery, int screenw,
 	int screenh, int w, int h, int *x, int *y)
 {
-	vlong px, py, xmax, ymax;
+	vlong below, px, py, xmax, ymax;
 
 	if(caret->valid){
 		px = caret->x;
-		py = (vlong)caret->y + max(caret->h, 0);
+		below = (vlong)caret->y + max(caret->h, 0);
+		if(below >= 0 && below + h <= screenh)
+			py = below;
+		else
+			py = (vlong)caret->y - h;
 	}else{
 		px = (vlong)pointerx + 10;
 		py = (vlong)pointery + 10;

tests/font_test.c

@@ -178,8 +178,8 @@ font_render(struct ct *t)
 {
 	static char *plain[] = { "A", "가", "あ", "漢", "☆", "𠀋" };
 	u32int *buf, *mem;
-	Str a, heart, missing;
+	Str a, heart, longrow, missing;
-	int i, w;
+	int i, natural, w, x, y;
 
 	mem = emalloc((Testn + 2 * Guard) * sizeof mem[0]);
 	fillpixels(mem, Testn + 2 * Guard, guardcolor);
@@ -216,6 +216,21 @@ font_render(struct ct *t)
 	checkclip(t, mem, Fontsz, -Fontsz / 2, &a);
 	checkclip(t, mem, Fontsz, Testh - Fontsz / 2, &a);
 
+	longrow = mkstr("abcdefghijklmnopqrstuvwxyz");
+	natural = textwidth(&longrow);
+	CT_CHECK(t, natural > 2*Fontsz);
+	fillpixels(buf, Testn, Colbg);
+	textdrawfit(buf, Testw, Testh, 2*Fontsz, Fontsz,
+		2*Fontsz, &longrow);
+	CT_CHECK(t, hasink(buf, Testn, Colbg));
+	for(y = Fontsz; y < 2*Fontsz; y++){
+		for(x = 0; x < 2*Fontsz; x++)
+			CT_EQ_UINT(t, Colbg, buf[y * Testw + x] & Rgbmask);
+		for(x = 4*Fontsz; x < Testw; x++)
+			CT_EQ_UINT(t, Colbg, buf[y * Testw + x] & Rgbmask);
+	}
+	CT_EQ_INT(t, natural, textwidth(&longrow));
+
 	missing = mkstr("\xF4\x8F\xBF\xBF");
 	for(i = 0; i < 32; i++){
 		textdraw(buf, Testw, Testh, Fontsz, Fontsz, &heart);

tests/popup_test.c

@@ -22,11 +22,38 @@ popup_layout(struct ct *t)
 	caret.y = 590;
 	popupposition(&caret, 0, 0, 800, 600, 100, 60, &x, &y);
 	CT_EQ_INT(t, 700, x);
-	CT_EQ_INT(t, 540, y);
+	CT_EQ_INT(t, 530, y);
+
+	/* Neither side fits: choose above, then clamp to the screen. */
+	caret.x = 20;
+	caret.y = 30;
+	caret.h = 20;
+	popupposition(&caret, 0, 0, 80, 80, 100, 100, &x, &y);
+	CT_EQ_INT(t, 0, x);
+	CT_EQ_INT(t, 0, y);
+
+	caret.x = 70;
+	caret.y = 80;
+	caret.h = 0;
+	popupposition(&caret, 0, 0, 800, 600, 100, 60, &x, &y);
+	CT_EQ_INT(t, 70, x);
+	CT_EQ_INT(t, 80, y);
+	caret.h = -20;
+	popupposition(&caret, 0, 0, 800, 600, 100, 60, &x, &y);
+	CT_EQ_INT(t, 70, x);
+	CT_EQ_INT(t, 80, y);
+
 	caret.x = INT_MIN;
 	caret.y = INT_MAX;
 	caret.h = INT_MAX;
 	popupposition(&caret, 0, 0, 800, 600, 100, 60, &x, &y);
 	CT_EQ_INT(t, 0, x);
 	CT_EQ_INT(t, 540, y);
+	caret.x = INT_MAX;
+	caret.y = INT_MIN;
+	caret.h = INT_MIN;
+	popupposition(&caret, 0, 0, INT_MAX, INT_MAX,
+		INT_MAX, INT_MAX, &x, &y);
+	CT_EQ_INT(t, 0, x);
+	CT_EQ_INT(t, 0, y);
 }

win.c

@@ -161,6 +161,8 @@ drawkouho(Drawcmd *dc, int n, int w, int h)
 	int npre, sely, y, i;
 	Str num, *s;
 
+	if(w <= 0 || w > Imgw || h <= 0 || h > Imgh)
+		return;
 	fill(img, w * h, Colbg);
 	npre = dc->pre.n != 0;
 	if(npre)
@@ -174,13 +176,15 @@ drawkouho(Drawcmd *dc, int n, int w, int h)
 		sclear(&num);
 		sputr(&num, '1' + i + Asciitofull);
 		textdraw(img, w, h, 0, y, &num);
-		textdraw(img, w, h, 2*Fontsz, y, s);
+		textdrawfit(img, w, h, 2*Fontsz, y, w - 2*Fontsz, s);
 	}
 }
 
 static void
 putimage(int w, int h)
 {
+	if(w <= 0 || w > Imgw || h <= 0 || h > Imgh)
+		return;
 	xcb_put_image(conn, XCB_IMAGE_FORMAT_Z_PIXMAP, pix, gc,
 		w, h, 0, 0, 0, depth, w * h * 4, (u8int*)img);
 	/* The retained background pixmap lets the server repaint exposures. */
@@ -213,7 +217,9 @@ winshow(Drawcmd *dc)
 		maxw = max(maxw, textwidth(&dc->kouho[i]));
 	vals[3] = h = (n + npre) * Fontsz;
 	width = (vlong)maxw + 3*Fontsz;
-	vals[2] = w = min(max(width, 1), Imgw);
+	vals[2] = w = min(min(max(width, 1), Imgw), scr->width_in_pixels);
+	if(w <= 0 || w > Imgw || h <= 0 || h > Imgh)
+		return 0;
 	px = py = 0;
 	if(!dc->caret.valid){
 		cookie = xcb_query_pointer(conn, scr->root);