1 files changed, 80 insertions, 0 deletions
diff --git a/src/pixman/test/scaling-bench.c b/src/pixman/test/scaling-bench.c
new file mode 100644
index 0000000..365e798
--- /dev/null
+++ b/src/pixman/test/scaling-bench.c
@@ -0,0 +1,80 @@
+#include <stdlib.h>
+#include "utils.h"
+
+#define SOURCE_WIDTH 320
+#define SOURCE_HEIGHT 240
+#define TEST_REPEATS 3
+
+static pixman_image_t *
+make_source (void)
+{
+    size_t n_bytes = (SOURCE_WIDTH + 2) * (SOURCE_HEIGHT + 2) * 4;
+    uint32_t *data = malloc (n_bytes);
+    pixman_image_t *source;
+
+    prng_randmemset (data, n_bytes, 0);
+    
+    source = pixman_image_create_bits (
+	PIXMAN_a8r8g8b8, SOURCE_WIDTH + 2, SOURCE_HEIGHT + 2,
+	data,
+	(SOURCE_WIDTH + 2) * 4);
+
+    pixman_image_set_filter (source, PIXMAN_FILTER_BILINEAR, NULL, 0);
+
+    return source;
+}
+
+int
+main ()
+{
+    double scale;
+    pixman_image_t *src;
+
+    prng_srand (23874);
+    
+    src = make_source ();
+    printf ("# %-6s %-22s   %-14s %-12s\n",
+	    "ratio",
+	    "resolutions",
+	    "time / ms",
+	    "time per pixel / ns");
+    for (scale = 0.1; scale < 10.005; scale += 0.01)
+    {
+	int i;
+	int dest_width = SOURCE_WIDTH * scale + 0.5;
+	int dest_height = SOURCE_HEIGHT * scale + 0.5;
+	int dest_byte_stride = (dest_width * 4 + 15) & ~15;
+	pixman_fixed_t s = (1 / scale) * 65536.0 + 0.5;
+	pixman_transform_t transform;
+	pixman_image_t *dest;
+	double t1, t2, t = -1;
+	uint32_t *dest_buf = aligned_malloc (16, dest_byte_stride * dest_height);
+	memset (dest_buf, 0, dest_byte_stride * dest_height);
+
+	pixman_transform_init_scale (&transform, s, s);
+	pixman_image_set_transform (src, &transform);
+	
+	dest = pixman_image_create_bits (
+	    PIXMAN_a8r8g8b8, dest_width, dest_height, dest_buf, dest_byte_stride);
+
+	for (i = 0; i < TEST_REPEATS; i++)
+	{
+	    t1 = gettime();
+	    pixman_image_composite (
+		PIXMAN_OP_OVER, src, NULL, dest,
+		scale, scale, 0, 0, 0, 0, dest_width, dest_height);
+	    t2 = gettime();
+	    if (t < 0 || t2 - t1 < t)
+		t = t2 - t1;
+	}
+
+	printf ("%6.2f : %4dx%-4d => %4dx%-4d : %12.4f : %12.4f\n",
+		scale, SOURCE_WIDTH, SOURCE_HEIGHT, dest_width, dest_height,
+		t * 1000, (t / (dest_width * dest_height)) * 1000000000);
+
+	pixman_image_unref (dest);
+	free (dest_buf);
+    }
+
+    return 0;
+}