From f567ea1e2798fd3156a416e61f083ea3e6b95719 Mon Sep 17 00:00:00 2001
From: sanine <sanine.not@pm.me>
Date: Wed, 12 Oct 2022 13:26:36 -0500
Subject: add pixman and libpng

---
 libs/pixman-0.40.0/test/scaling-helpers-test.c | 92 ++++++++++++++++++++++++++
 1 file changed, 92 insertions(+)
 create mode 100644 libs/pixman-0.40.0/test/scaling-helpers-test.c

(limited to 'libs/pixman-0.40.0/test/scaling-helpers-test.c')

diff --git a/libs/pixman-0.40.0/test/scaling-helpers-test.c b/libs/pixman-0.40.0/test/scaling-helpers-test.c
new file mode 100644
index 0000000..cd5ace0
--- /dev/null
+++ b/libs/pixman-0.40.0/test/scaling-helpers-test.c
@@ -0,0 +1,92 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <assert.h>
+#include "utils.h"
+#include "pixman-inlines.h"
+
+/* A trivial reference implementation for
+ * 'bilinear_pad_repeat_get_scanline_bounds'
+ */
+static void
+bilinear_pad_repeat_get_scanline_bounds_ref (int32_t        source_image_width,
+					     pixman_fixed_t vx_,
+					     pixman_fixed_t unit_x,
+					     int32_t *      left_pad,
+					     int32_t *      left_tz,
+					     int32_t *      width,
+					     int32_t *      right_tz,
+					     int32_t *      right_pad)
+{
+    int w = *width;
+    int64_t vx = vx_;
+    *left_pad = 0;
+    *left_tz = 0;
+    *width = 0;
+    *right_tz = 0;
+    *right_pad = 0;
+    while (--w >= 0)
+    {
+	if (vx < 0)
+	{
+	    if (vx + pixman_fixed_1 < 0)
+		*left_pad += 1;
+	    else
+		*left_tz += 1;
+	}
+	else if (vx + pixman_fixed_1 >= pixman_int_to_fixed (source_image_width))
+	{
+	    if (vx >= pixman_int_to_fixed (source_image_width))
+		*right_pad += 1;
+	    else
+		*right_tz += 1;
+	}
+	else
+	{
+	    *width += 1;
+	}
+	vx += unit_x;
+    }
+}
+
+int
+main (void)
+{
+    int i;
+    prng_srand (0);
+    for (i = 0; i < 10000; i++)
+    {
+	int32_t left_pad1, left_tz1, width1, right_tz1, right_pad1;
+	int32_t left_pad2, left_tz2, width2, right_tz2, right_pad2;
+	pixman_fixed_t vx = prng_rand_n(10000 << 16) - (3000 << 16);
+	int32_t width = prng_rand_n(10000);
+	int32_t source_image_width = prng_rand_n(10000) + 1;
+	pixman_fixed_t unit_x = prng_rand_n(10 << 16) + 1;
+	width1 = width2 = width;
+
+	bilinear_pad_repeat_get_scanline_bounds_ref (source_image_width,
+						     vx,
+						     unit_x,
+						     &left_pad1,
+						     &left_tz1,
+						     &width1,
+						     &right_tz1,
+						     &right_pad1);
+
+	bilinear_pad_repeat_get_scanline_bounds (source_image_width,
+						 vx,
+						 unit_x,
+						 &left_pad2,
+						 &left_tz2,
+						 &width2,
+						 &right_tz2,
+						 &right_pad2);
+
+	assert (left_pad1 == left_pad2);
+	assert (left_tz1 == left_tz2);
+	assert (width1 == width2);
+	assert (right_tz1 == right_tz2);
+	assert (right_pad1 == right_pad2);
+    }
+
+    return 0;
+}
-- 
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