[Intel-gfx] [PATCH i-g-t 3/4] tools/intel_gpu_top: Optimise interactive display a bit

[Tvrtko Ursulin]

From: Tvrtko Ursulin <tvrtko.ursu...@intel.com>

Padding the percentage bars and table columns with spaces happens quite a
lot so lets do better than putchar at a time. Have a table of visually
empty strings and build the required length out of those chunks.

While at it, also move the percentage bar table into its function scope.

v2:
 * Fix checkpatch and use ARRAY_SIZE. (Kamil)

Signed-off-by: Tvrtko Ursulin <tvrtko.ursu...@intel.com>
Cc: Kamil Konieczny <kamil.koniec...@linux.intel.com>
---
 tools/intel_gpu_top.c | 38 +++++++++++++++++++++++++++++++++-----
 1 file changed, 33 insertions(+), 5 deletions(-)

diff --git a/tools/intel_gpu_top.c b/tools/intel_gpu_top.c
index b6d1014f00b8..006879c4ae67 100644
--- a/tools/intel_gpu_top.c
+++ b/tools/intel_gpu_top.c
@@ -926,14 +926,39 @@ static void free_display_clients(struct igt_drm_clients 
*clients)
        free(clients);
 }
 
-static const char *bars[] = { " ", "▏", "▎", "▍", "▌", "▋", "▊", "▉", "█" };
-
 static int n_spaces(const int n)
 {
-       int i;
+       static const char *spaces[] = {
+               " ",
+               "  ",
+               "   ",
+               "    ",
+               "     ",
+               "      ",
+               "       ",
+               "        ",
+               "         ",
+               "          ",
+               "           ",
+               "            ",
+               "             ",
+               "              ",
+               "               ",
+               "                ",
+               "                 ",
+               "                  ",
+               "                   ",
+       };
+       int i, r = n;
 
-       for (i = 0; i < n; i++)
-               putchar(' ');
+       while (r) {
+               if (r > ARRAY_SIZE(spaces))
+                       i = ARRAY_SIZE(spaces) - 1;
+               else
+                       i = r - 1;
+               fputs(spaces[i], stdout);
+               r -= i + 1;
+       }
 
        return n;
 }
@@ -941,6 +966,9 @@ static int n_spaces(const int n)
 static void
 print_percentage_bar(double percent, double max, int max_len, bool numeric)
 {
+       static const char *bars[] = {
+               " ", "▏", "▎", "▍", "▌", "▋", "▊", "▉", "█"
+       };
        int bar_len, i, len = max_len - 2;
        const int w = 8;
 
-- 
2.39.2