1 files changed, 38 insertions, 0 deletions
diff --git a/test/scaling-test-bisect.rb b/test/scaling-test-bisect.rb
new file mode 100644
index 00000000..2e4aff30
--- /dev/null
+++ b/test/scaling-test-bisect.rb
@@ -0,0 +1,38 @@
+#!/usr/bin/env ruby
+
+if not ARGV[0] or not ARGV[1] then
+    printf("Please provide two 'scaling-test' static binaries in the command line.\n\n")
+    printf("The first should be linked with the correct reference pixman library.\n")
+    printf("The second binrary should be linked with the pixman library to be tested.\n")
+    exit(0)
+end
+
+$MAX = 10000
+$MIN = 1
+$AVG = 0
+
+if `#{ARGV[0]} #{$MAX} 2>/dev/null` == `#{ARGV[1]} #{$MAX} 2>/dev/null` then
+    printf("test ok\n")
+    exit(0)
+end
+
+printf("test failed, bisecting...\n")
+
+while $MAX != $MIN + 1 do
+    $AVG = (($MIN + $MAX) / 2).to_i
+    res1 = `#{ARGV[0]} #{$AVG} 2>/dev/null`
+    res2 = `#{ARGV[1]} #{$AVG} 2>/dev/null`
+    if res1 != res2 then
+        $MAX = $AVG
+    else
+        $MIN = $AVG
+    end
+end
+
+printf("-- ref --\n")
+printf("%s\n", `#{ARGV[0]} -#{$MAX}`)
+printf("-- new --\n")
+printf("%s\n", `#{ARGV[1]} -#{$MAX}`)
+
+printf("\nFailed test number is %d, you can reproduce the problematic conditions\n", $MAX)
+printf("by running 'scaling-test -%d'\n", $MAX)