lib: add kmstest_cairo_printf_line

Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@gmail.com>
[v3: fix mode printing in paint_output_info() botched by debugging leftover :/ ]

2 files changed, 57 insertions, 0 deletions

diff --git a/lib/drmtest.c b/lib/drmtest.c
index 3c4812f0..71dd06b0 100644
--- a/lib/drmtest.c
+++ b/lib/drmtest.c
@@ -907,6 +907,50 @@ paint_test_patterns(cairo_t *cr, int width, int height)
 	paint_color_gradient(cr, x, y, gr_width, gr_height, 1, 1, 1);
 }
 
+int kmstest_cairo_printf_line(cairo_t *cr, enum kmstest_text_align align,
+				double yspacing, const char *fmt, ...)
+{
+	double x, y, xofs, yofs;
+	cairo_text_extents_t extents;
+	char *text;
+	va_list ap;
+	int ret;
+
+	va_start(ap, fmt);
+	ret = vasprintf(&text, fmt, ap);
+	assert(ret >= 0);
+	va_end(ap);
+
+	cairo_text_extents(cr, text, &extents);
+
+	xofs = yofs = 0;
+	if (align & align_right)
+		xofs = -extents.width;
+	else if (align & align_hcenter)
+		xofs = -extents.width / 2;
+
+	if (align & align_top)
+		yofs = extents.height;
+	else if (align & align_vcenter)
+		yofs = extents.height / 2;
+
+	cairo_get_current_point(cr, &x, &y);
+	if (xofs || yofs)
+		cairo_rel_move_to(cr, xofs, yofs);
+
+	cairo_text_path(cr, text);
+	cairo_set_source_rgb(cr, 0, 0, 0);
+	cairo_stroke_preserve(cr);
+	cairo_set_source_rgb(cr, 1, 1, 1);
+	cairo_fill(cr);
+
+	cairo_move_to(cr, x, y + extents.height + yspacing);
+
+	free(text);
+
+	return extents.width;
+}
+
 enum corner {
 	topleft,
 	topright,
diff --git a/lib/drmtest.h b/lib/drmtest.h
index 38aeb9d3..3c1368db 100644
--- a/lib/drmtest.h
+++ b/lib/drmtest.h
@@ -109,6 +109,19 @@ struct kmstest_fb {
 	unsigned size;
 };
 
+enum kmstest_text_align {
+	align_left,
+	align_bottom	= align_left,
+	align_right	= 0x01,
+	align_top	= 0x02,
+	align_vcenter	= 0x04,
+	align_hcenter	= 0x08,
+};
+
+int kmstest_cairo_printf_line(cairo_t *cr, enum kmstest_text_align align,
+			       double yspacing, const char *fmt, ...)
+			       __attribute__((format (printf, 4, 5)));
+
 typedef void (*kmstest_paint_func)(cairo_t *cr, int width, int height, void *priv);
 
 unsigned int kmstest_create_fb(int fd, int width, int height, int bpp,