[PATCH v2 3/5] perf diff: generalize hpp__color_delta for -c

[Ramkumar Ramachandra <artagnon@gmail.com>]

Generalize the function so that we can accommodate all three comparison
methods: delta, ratio, and wdiff.

Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Ramkumar Ramachandra <artagnon@gmail.com>
---
 tools/perf/builtin-diff.c | 47 +++++++++++++++++++++++++++++++++++++----------
 1 file changed, 37 insertions(+), 10 deletions(-)

diff --git a/tools/perf/builtin-diff.c b/tools/perf/builtin-diff.c
index 84d5f2d..a54736c 100644
--- a/tools/perf/builtin-diff.c
+++ b/tools/perf/builtin-diff.c
@@ -769,33 +769,60 @@ static int hpp__entry_baseline(struct hist_entry *he, char *buf, size_t size)
 	return ret;
 }
 
-static int hpp__color_delta(struct perf_hpp_fmt *fmt,
-			struct perf_hpp *hpp, struct hist_entry *he)
+static int __hpp__color_compare(struct perf_hpp_fmt *fmt,
+				struct perf_hpp *hpp, struct hist_entry *he,
+				int comparison_method)
 {
 	struct diff_hpp_fmt *dfmt =
 		container_of(fmt, struct diff_hpp_fmt, fmt);
 	struct hist_entry *pair = get_pair_fmt(he, dfmt);
-	double percent;
+	double delta;
 	char pfmt[20] = " ";
 
 	if (!pair)
 		goto dummy_print;
 	if (pair->diff.computed)
-		percent = pair->diff.period_ratio_delta;
+		switch (comparison_method) {
+		case COMPUTE_DELTA:
+			delta = pair->diff.period_ratio_delta;
+			break;
+		default:
+			BUG_ON(1);
+		}
 	else
-		percent = compute_delta(he, pair);
+		switch (comparison_method) {
+		case COMPUTE_DELTA:
+			delta = compute_delta(he, pair);
+			break;
+		default:
+			BUG_ON(1);
+		}
 
-	if (!he->dummy && fabs(percent) >= 0.01) {
-		scnprintf(pfmt, 20, "%%%+d.2f%%%%", dfmt->header_width - 1);
-		return color_snprintf(hpp->buf, hpp->size,
-				percent > 0 ? PERF_COLOR_GREEN : PERF_COLOR_RED,
-				pfmt, percent);
+	if (!he->dummy) {
+		switch (comparison_method) {
+		case COMPUTE_DELTA:
+			if (fabs(delta) < 0.01)
+				goto dummy_print;
+			scnprintf(pfmt, 20, "%%%+d.2f%%%%", dfmt->header_width - 1);
+			return color_snprintf(hpp->buf, hpp->size,
+					delta > 0 ? PERF_COLOR_GREEN : PERF_COLOR_RED,
+					pfmt, delta);
+			break;
+		default:
+			BUG_ON(1);
+		}
 	} else
 dummy_print:
 		return scnprintf(hpp->buf, hpp->size, "%*s",
 				dfmt->header_width, pfmt);
 }
 
+static int hpp__color_delta(struct perf_hpp_fmt *fmt,
+			struct perf_hpp *hpp, struct hist_entry *he)
+{
+	return __hpp__color_compare(fmt, hpp, he, COMPUTE_DELTA);
+}
+
 static void
 hpp__entry_unpair(struct hist_entry *he, int idx, char *buf, size_t size)
 {
-- 
1.8.5.rc0.5.g70ebc73.dirty