test: Search/replace 'lcg_*' -> 'prng_*'

The 'lcg' prefix is going to be misleading if we replace
PRNG algorithm.

14 files changed, 317 insertions, 317 deletions

diff --git a/test/affine-test.c b/test/affine-test.c
index daa86c8..d94023b 100644
--- a/test/affine-test.c
+++ b/test/affine-test.c
@@ -48,18 +48,18 @@ test_composite (int      testnum,
     uint32_t           crc32;
     FLOAT_REGS_CORRUPTION_DETECTOR_START ();
 
-    lcg_srand (testnum);
+    prng_srand (testnum);
 
-    src_bpp = (lcg_rand_n (2) == 0) ? 2 : 4;
-    dst_bpp = (lcg_rand_n (2) == 0) ? 2 : 4;
-    op = (lcg_rand_n (2) == 0) ? PIXMAN_OP_SRC : PIXMAN_OP_OVER;
+    src_bpp = (prng_rand_n (2) == 0) ? 2 : 4;
+    dst_bpp = (prng_rand_n (2) == 0) ? 2 : 4;
+    op = (prng_rand_n (2) == 0) ? PIXMAN_OP_SRC : PIXMAN_OP_OVER;
 
-    src_width = lcg_rand_n (MAX_SRC_WIDTH) + 1;
-    src_height = lcg_rand_n (MAX_SRC_HEIGHT) + 1;
-    dst_width = lcg_rand_n (MAX_DST_WIDTH) + 1;
-    dst_height = lcg_rand_n (MAX_DST_HEIGHT) + 1;
-    src_stride = src_width * src_bpp + lcg_rand_n (MAX_STRIDE) * src_bpp;
-    dst_stride = dst_width * dst_bpp + lcg_rand_n (MAX_STRIDE) * dst_bpp;
+    src_width = prng_rand_n (MAX_SRC_WIDTH) + 1;
+    src_height = prng_rand_n (MAX_SRC_HEIGHT) + 1;
+    dst_width = prng_rand_n (MAX_DST_WIDTH) + 1;
+    dst_height = prng_rand_n (MAX_DST_HEIGHT) + 1;
+    src_stride = src_width * src_bpp + prng_rand_n (MAX_STRIDE) * src_bpp;
+    dst_stride = dst_width * dst_bpp + prng_rand_n (MAX_STRIDE) * dst_bpp;
 
     if (src_stride & 3)
 	src_stride += 2;
@@ -67,26 +67,26 @@ test_composite (int      testnum,
     if (dst_stride & 3)
 	dst_stride += 2;
 
-    src_x = -(src_width / 4) + lcg_rand_n (src_width * 3 / 2);
-    src_y = -(src_height / 4) + lcg_rand_n (src_height * 3 / 2);
-    dst_x = -(dst_width / 4) + lcg_rand_n (dst_width * 3 / 2);
-    dst_y = -(dst_height / 4) + lcg_rand_n (dst_height * 3 / 2);
-    w = lcg_rand_n (dst_width * 3 / 2 - dst_x);
-    h = lcg_rand_n (dst_height * 3 / 2 - dst_y);
+    src_x = -(src_width / 4) + prng_rand_n (src_width * 3 / 2);
+    src_y = -(src_height / 4) + prng_rand_n (src_height * 3 / 2);
+    dst_x = -(dst_width / 4) + prng_rand_n (dst_width * 3 / 2);
+    dst_y = -(dst_height / 4) + prng_rand_n (dst_height * 3 / 2);
+    w = prng_rand_n (dst_width * 3 / 2 - dst_x);
+    h = prng_rand_n (dst_height * 3 / 2 - dst_y);
 
     srcbuf = (uint32_t *)malloc (src_stride * src_height);
     dstbuf = (uint32_t *)malloc (dst_stride * dst_height);
 
     for (i = 0; i < src_stride * src_height; i++)
-	*((uint8_t *)srcbuf + i) = lcg_rand_n (256);
+	*((uint8_t *)srcbuf + i) = prng_rand_n (256);
 
     for (i = 0; i < dst_stride * dst_height; i++)
-	*((uint8_t *)dstbuf + i) = lcg_rand_n (256);
+	*((uint8_t *)dstbuf + i) = prng_rand_n (256);
 
-    src_fmt = src_bpp == 4 ? (lcg_rand_n (2) == 0 ?
+    src_fmt = src_bpp == 4 ? (prng_rand_n (2) == 0 ?
                               PIXMAN_a8r8g8b8 : PIXMAN_x8r8g8b8) : PIXMAN_r5g6b5;
 
-    dst_fmt = dst_bpp == 4 ? (lcg_rand_n (2) == 0 ?
+    dst_fmt = dst_bpp == 4 ? (prng_rand_n (2) == 0 ?
                               PIXMAN_a8r8g8b8 : PIXMAN_x8r8g8b8) : PIXMAN_r5g6b5;
 
     src_img = pixman_image_create_bits (
@@ -100,29 +100,29 @@ test_composite (int      testnum,
 
     pixman_transform_init_identity (&transform);
 
-    if (lcg_rand_n (3) > 0)
+    if (prng_rand_n (3) > 0)
     {
-	scale_x = -65536 * 3 + lcg_rand_N (65536 * 6);
-	if (lcg_rand_n (2))
-	    scale_y = -65536 * 3 + lcg_rand_N (65536 * 6);
+	scale_x = -65536 * 3 + prng_rand_N (65536 * 6);
+	if (prng_rand_n (2))
+	    scale_y = -65536 * 3 + prng_rand_N (65536 * 6);
 	else
 	    scale_y = scale_x;
 	pixman_transform_init_scale (&transform, scale_x, scale_y);
     }
-    if (lcg_rand_n (3) > 0)
+    if (prng_rand_n (3) > 0)
     {
-	translate_x = -65536 * 3 + lcg_rand_N (6 * 65536);
-	if (lcg_rand_n (2))
-	    translate_y = -65536 * 3 + lcg_rand_N (6 * 65536);
+	translate_x = -65536 * 3 + prng_rand_N (6 * 65536);
+	if (prng_rand_n (2))
+	    translate_y = -65536 * 3 + prng_rand_N (6 * 65536);
 	else
 	    translate_y = translate_x;
 	pixman_transform_translate (&transform, NULL, translate_x, translate_y);
     }
 
-    if (lcg_rand_n (4) > 0)
+    if (prng_rand_n (4) > 0)
     {
 	int c, s, tx = 0, ty = 0;
-	switch (lcg_rand_n (4))
+	switch (prng_rand_n (4))
 	{
 	case 0:
 	    /* 90 degrees */
@@ -145,32 +145,32 @@ test_composite (int      testnum,
 	    break;
 	default:
 	    /* arbitrary rotation */
-	    c = lcg_rand_N (2 * 65536) - 65536;
-	    s = lcg_rand_N (2 * 65536) - 65536;
+	    c = prng_rand_N (2 * 65536) - 65536;
+	    s = prng_rand_N (2 * 65536) - 65536;
 	    break;
 	}
 	pixman_transform_rotate (&transform, NULL, c, s);
 	pixman_transform_translate (&transform, NULL, tx, ty);
     }
 
-    if (lcg_rand_n (8) == 0)
+    if (prng_rand_n (8) == 0)
     {
 	/* Flip random bits */
 	int maxflipcount = 8;
 	while (maxflipcount--)
 	{
-	    int i = lcg_rand_n (2);
-	    int j = lcg_rand_n (3);
-	    int bitnum = lcg_rand_n (32);
+	    int i = prng_rand_n (2);
+	    int j = prng_rand_n (3);
+	    int bitnum = prng_rand_n (32);
 	    transform.matrix[i][j] ^= 1 << bitnum;
-	    if (lcg_rand_n (2))
+	    if (prng_rand_n (2))
 		break;
 	}
     }
 
     pixman_image_set_transform (src_img, &transform);
 
-    switch (lcg_rand_n (4))
+    switch (prng_rand_n (4))
     {
     case 0:
 	repeat = PIXMAN_REPEAT_NONE;
@@ -193,7 +193,7 @@ test_composite (int      testnum,
     }
     pixman_image_set_repeat (src_img, repeat);
 
-    if (lcg_rand_n (2))
+    if (prng_rand_n (2))
 	pixman_image_set_filter (src_img, PIXMAN_FILTER_NEAREST, NULL, 0);
     else
 	pixman_image_set_filter (src_img, PIXMAN_FILTER_BILINEAR, NULL, 0);
@@ -220,19 +220,19 @@ test_composite (int      testnum,
 	printf ("w=%d, h=%d\n", w, h);
     }
 
-    if (lcg_rand_n (8) == 0)
+    if (prng_rand_n (8) == 0)
     {
 	pixman_box16_t clip_boxes[2];
-	int            n = lcg_rand_n (2) + 1;
+	int            n = prng_rand_n (2) + 1;
 
 	for (i = 0; i < n; i++)
 	{
-	    clip_boxes[i].x1 = lcg_rand_n (src_width);
-	    clip_boxes[i].y1 = lcg_rand_n (src_height);
+	    clip_boxes[i].x1 = prng_rand_n (src_width);
+	    clip_boxes[i].y1 = prng_rand_n (src_height);
 	    clip_boxes[i].x2 =
-		clip_boxes[i].x1 + lcg_rand_n (src_width - clip_boxes[i].x1);
+		clip_boxes[i].x1 + prng_rand_n (src_width - clip_boxes[i].x1);
 	    clip_boxes[i].y2 =
-		clip_boxes[i].y1 + lcg_rand_n (src_height - clip_boxes[i].y1);
+		clip_boxes[i].y1 + prng_rand_n (src_height - clip_boxes[i].y1);
 
 	    if (verbose)
 	    {
@@ -248,18 +248,18 @@ test_composite (int      testnum,
 	pixman_region_fini (&clip);
     }
 
-    if (lcg_rand_n (8) == 0)
+    if (prng_rand_n (8) == 0)
     {
 	pixman_box16_t clip_boxes[2];
-	int            n = lcg_rand_n (2) + 1;
+	int            n = prng_rand_n (2) + 1;
 	for (i = 0; i < n; i++)
 	{
-	    clip_boxes[i].x1 = lcg_rand_n (dst_width);
-	    clip_boxes[i].y1 = lcg_rand_n (dst_height);
+	    clip_boxes[i].x1 = prng_rand_n (dst_width);
+	    clip_boxes[i].y1 = prng_rand_n (dst_height);
 	    clip_boxes[i].x2 =
-		clip_boxes[i].x1 + lcg_rand_n (dst_width - clip_boxes[i].x1);
+		clip_boxes[i].x1 + prng_rand_n (dst_width - clip_boxes[i].x1);
 	    clip_boxes[i].y2 =
-		clip_boxes[i].y1 + lcg_rand_n (dst_height - clip_boxes[i].y1);
+		clip_boxes[i].y1 + prng_rand_n (dst_height - clip_boxes[i].y1);
 
 	    if (verbose)
 	    {
diff --git a/test/blitters-test.c b/test/blitters-test.c
index 30d6912..b0115d4 100644
--- a/test/blitters-test.c
+++ b/test/blitters-test.c
@@ -33,14 +33,14 @@ create_random_image (pixman_format_code_t *allowed_formats,
     while (allowed_formats[n] != PIXMAN_null)
 	n++;
 
-    if (n > N_MOST_LIKELY_FORMATS && lcg_rand_n (4) != 0)
+    if (n > N_MOST_LIKELY_FORMATS && prng_rand_n (4) != 0)
 	n = N_MOST_LIKELY_FORMATS;
-    fmt = allowed_formats[lcg_rand_n (n)];
+    fmt = allowed_formats[prng_rand_n (n)];
 
-    width = lcg_rand_n (max_width) + 1;
-    height = lcg_rand_n (max_height) + 1;
+    width = prng_rand_n (max_width) + 1;
+    height = prng_rand_n (max_height) + 1;
     stride = (width * PIXMAN_FORMAT_BPP (fmt) + 7) / 8 +
-	lcg_rand_n (max_extra_stride + 1);
+	prng_rand_n (max_extra_stride + 1);
     stride = (stride + 3) & ~3;
 
     /* do the allocation */
@@ -52,8 +52,8 @@ create_random_image (pixman_format_code_t *allowed_formats,
 	/* generation is biased to having more 0 or 255 bytes as
 	 * they are more likely to be special-cased in code
 	 */
-	*((uint8_t *)buf + i) = lcg_rand_n (4) ? lcg_rand_n (256) :
-	    (lcg_rand_n (2) ? 0 : 255);
+	*((uint8_t *)buf + i) = prng_rand_n (4) ? prng_rand_n (256) :
+	    (prng_rand_n (2) ? 0 : 255);
     }
 
     img = pixman_image_create_bits (fmt, width, height, buf, stride);
@@ -67,7 +67,7 @@ create_random_image (pixman_format_code_t *allowed_formats,
 	pixman_image_set_indexed (img, &(y_palette[PIXMAN_FORMAT_BPP (fmt)]));
     }
 
-    if (lcg_rand_n (16) == 0)
+    if (prng_rand_n (16) == 0)
 	pixman_image_set_filter (img, PIXMAN_FILTER_BILINEAR, NULL, 0);
 
     image_endian_swap (img);
@@ -251,11 +251,11 @@ test_composite (int testnum, int verbose)
     if (max_extra_stride > 8)
 	max_extra_stride = 8;
 
-    lcg_srand (testnum);
+    prng_srand (testnum);
 
-    op = op_list[lcg_rand_n (ARRAY_LENGTH (op_list))];
+    op = op_list[prng_rand_n (ARRAY_LENGTH (op_list))];
 
-    if (lcg_rand_n (8))
+    if (prng_rand_n (8))
     {
 	/* normal image */
 	src_img = create_random_image (img_fmt_list, max_width, max_height,
@@ -284,10 +284,10 @@ test_composite (int testnum, int verbose)
     dstbuf = pixman_image_get_data (dst_img);
     srcbuf = pixman_image_get_data (src_img);
 
-    src_x = lcg_rand_n (src_width);
-    src_y = lcg_rand_n (src_height);
-    dst_x = lcg_rand_n (dst_width);
-    dst_y = lcg_rand_n (dst_height);
+    src_x = prng_rand_n (src_width);
+    src_y = prng_rand_n (src_height);
+    dst_x = prng_rand_n (dst_width);
+    dst_y = prng_rand_n (dst_height);
 
     mask_img = NULL;
     mask_fmt = PIXMAN_null;
@@ -296,10 +296,10 @@ test_composite (int testnum, int verbose)
     maskbuf = NULL;
 
     if ((src_fmt == PIXMAN_x8r8g8b8 || src_fmt == PIXMAN_x8b8g8r8) &&
-	(lcg_rand_n (4) == 0))
+	(prng_rand_n (4) == 0))
     {
 	/* PIXBUF */
-	mask_fmt = lcg_rand_n (2) ? PIXMAN_a8r8g8b8 : PIXMAN_a8b8g8r8;
+	mask_fmt = prng_rand_n (2) ? PIXMAN_a8r8g8b8 : PIXMAN_a8b8g8r8;
 	mask_img = pixman_image_create_bits (mask_fmt,
 	                                     src_width,
 	                                     src_height,
@@ -309,9 +309,9 @@ test_composite (int testnum, int verbose)
 	mask_y = src_y;
 	maskbuf = srcbuf;
     }
-    else if (lcg_rand_n (2))
+    else if (prng_rand_n (2))
     {
-	if (lcg_rand_n (2))
+	if (prng_rand_n (2))
 	{
 	    mask_img = create_random_image (mask_fmt_list, max_width, max_height,
 					   max_extra_stride, &mask_fmt);
@@ -324,16 +324,16 @@ test_composite (int testnum, int verbose)
 	    pixman_image_set_repeat (mask_img, PIXMAN_REPEAT_NORMAL);
 	}
 
-	if (lcg_rand_n (2))
+	if (prng_rand_n (2))
 	    pixman_image_set_component_alpha (mask_img, 1);
 
-	mask_x = lcg_rand_n (pixman_image_get_width (mask_img));
-	mask_y = lcg_rand_n (pixman_image_get_height (mask_img));
+	mask_x = prng_rand_n (pixman_image_get_width (mask_img));
+	mask_y = prng_rand_n (pixman_image_get_height (mask_img));
     }
 
 
-    w = lcg_rand_n (dst_width - dst_x + 1);
-    h = lcg_rand_n (dst_height - dst_y + 1);
+    w = prng_rand_n (dst_width - dst_x + 1);
+    h = prng_rand_n (dst_height - dst_y + 1);
 
     if (verbose)
     {
diff --git a/test/combiner-test.c b/test/combiner-test.c
index c438ae6..7d6feda 100644
--- a/test/combiner-test.c
+++ b/test/combiner-test.c
@@ -67,7 +67,7 @@ static const pixman_op_t op_list[] =
 static float
 rand_float (void)
 {
-    uint32_t u = lcg_rand_u32();
+    uint32_t u = prng_rand_u32();
 
     return *(float *)&u;
 }
@@ -123,7 +123,7 @@ main ()
     
     impl = _pixman_internal_only_get_implementation();
     
-    lcg_srand (0);
+    prng_srand (0);
 
     for (i = 0; i < ARRAY_LENGTH (op_list); ++i)
     {
diff --git a/test/composite-traps-test.c b/test/composite-traps-test.c
index 9fc94a4..efb3c30 100644
--- a/test/composite-traps-test.c
+++ b/test/composite-traps-test.c
@@ -26,7 +26,7 @@ static pixman_op_t operators[] =
 };
 
 #define RANDOM_ELT(array)						\
-    ((array)[lcg_rand_n(ARRAY_LENGTH((array)))])
+    ((array)[prng_rand_n(ARRAY_LENGTH((array)))])
 
 static void
 destroy_bits (pixman_image_t *image, void *data)
@@ -37,7 +37,7 @@ destroy_bits (pixman_image_t *image, void *data)
 static pixman_fixed_t
 random_fixed (int n)
 {
-    return lcg_rand_N (n << 16);
+    return prng_rand_N (n << 16);
 }
 
 /*
@@ -75,17 +75,17 @@ test_composite (int      testnum,
     
     FLOAT_REGS_CORRUPTION_DETECTOR_START ();
 
-    lcg_srand (testnum);
+    prng_srand (testnum);
 
     op = RANDOM_ELT (operators);
     mask_format = RANDOM_ELT (mask_formats);
 
     /* Create source image */
     
-    if (lcg_rand_n (4) == 0)
+    if (prng_rand_n (4) == 0)
     {
 	src_img = pixman_image_create_solid_fill (
-	    &(colors[lcg_rand_n (ARRAY_LENGTH (colors))]));
+	    &(colors[prng_rand_n (ARRAY_LENGTH (colors))]));
 
 	src_x = 10;
 	src_y = 234;
@@ -94,13 +94,13 @@ test_composite (int      testnum,
     {
 	pixman_format_code_t src_format = RANDOM_ELT(formats);
 	int src_bpp = (PIXMAN_FORMAT_BPP (src_format) + 7) / 8;
-	int src_width = lcg_rand_n (MAX_SRC_WIDTH) + 1;
-	int src_height = lcg_rand_n (MAX_SRC_HEIGHT) + 1;
-	int src_stride = src_width * src_bpp + lcg_rand_n (MAX_STRIDE) * src_bpp;
+	int src_width = prng_rand_n (MAX_SRC_WIDTH) + 1;
+	int src_height = prng_rand_n (MAX_SRC_HEIGHT) + 1;
+	int src_stride = src_width * src_bpp + prng_rand_n (MAX_STRIDE) * src_bpp;
 	uint32_t *bits;
 
-	src_x = -(src_width / 4) + lcg_rand_n (src_width * 3 / 2);
-	src_y = -(src_height / 4) + lcg_rand_n (src_height * 3 / 2);
+	src_x = -(src_width / 4) + prng_rand_n (src_width * 3 / 2);
+	src_y = -(src_height / 4) + prng_rand_n (src_height * 3 / 2);
 
 	src_stride = (src_stride + 3) & ~3;
 	
@@ -111,19 +111,19 @@ test_composite (int      testnum,
 
 	pixman_image_set_destroy_function (src_img, destroy_bits, bits);
 
-	if (lcg_rand_n (8) == 0)
+	if (prng_rand_n (8) == 0)
 	{
 	    pixman_box16_t clip_boxes[2];
-	    int            n = lcg_rand_n (2) + 1;
+	    int            n = prng_rand_n (2) + 1;
 	    
 	    for (i = 0; i < n; i++)
 	    {
-		clip_boxes[i].x1 = lcg_rand_n (src_width);
-		clip_boxes[i].y1 = lcg_rand_n (src_height);
+		clip_boxes[i].x1 = prng_rand_n (src_width);
+		clip_boxes[i].y1 = prng_rand_n (src_height);
 		clip_boxes[i].x2 =
-		    clip_boxes[i].x1 + lcg_rand_n (src_width - clip_boxes[i].x1);
+		    clip_boxes[i].x1 + prng_rand_n (src_width - clip_boxes[i].x1);
 		clip_boxes[i].y2 =
-		    clip_boxes[i].y1 + lcg_rand_n (src_height - clip_boxes[i].y1);
+		    clip_boxes[i].y1 + prng_rand_n (src_height - clip_boxes[i].y1);
 		
 		if (verbose)
 		{
@@ -146,15 +146,15 @@ test_composite (int      testnum,
     {
 	dst_format = RANDOM_ELT(formats);
 	dst_bpp = (PIXMAN_FORMAT_BPP (dst_format) + 7) / 8;
-	dst_width = lcg_rand_n (MAX_DST_WIDTH) + 1;
-	dst_height = lcg_rand_n (MAX_DST_HEIGHT) + 1;
-	dst_stride = dst_width * dst_bpp + lcg_rand_n (MAX_STRIDE) * dst_bpp;
+	dst_width = prng_rand_n (MAX_DST_WIDTH) + 1;
+	dst_height = prng_rand_n (MAX_DST_HEIGHT) + 1;
+	dst_stride = dst_width * dst_bpp + prng_rand_n (MAX_STRIDE) * dst_bpp;
 	dst_stride = (dst_stride + 3) & ~3;
 	
 	dst_bits = (uint32_t *)make_random_bytes (dst_stride * dst_height);
 
-	dst_x = -(dst_width / 4) + lcg_rand_n (dst_width * 3 / 2);
-	dst_y = -(dst_height / 4) + lcg_rand_n (dst_height * 3 / 2);
+	dst_x = -(dst_width / 4) + prng_rand_n (dst_width * 3 / 2);
+	dst_y = -(dst_height / 4) + prng_rand_n (dst_height * 3 / 2);
 	
 	dst_img = pixman_image_create_bits (
 	    dst_format, dst_width, dst_height, dst_bits, dst_stride);
@@ -166,7 +166,7 @@ test_composite (int      testnum,
     {
 	int i;
 
-	n_traps = lcg_rand_n (25);
+	n_traps = prng_rand_n (25);
 	traps = fence_malloc (n_traps * sizeof (pixman_trapezoid_t));
 
 	for (i = 0; i < n_traps; ++i)
@@ -186,18 +186,18 @@ test_composite (int      testnum,
 	}
     }
     
-    if (lcg_rand_n (8) == 0)
+    if (prng_rand_n (8) == 0)
     {
 	pixman_box16_t clip_boxes[2];
-	int            n = lcg_rand_n (2) + 1;
+	int            n = prng_rand_n (2) + 1;
 	for (i = 0; i < n; i++)
 	{
-	    clip_boxes[i].x1 = lcg_rand_n (dst_width);
-	    clip_boxes[i].y1 = lcg_rand_n (dst_height);
+	    clip_boxes[i].x1 = prng_rand_n (dst_width);
+	    clip_boxes[i].y1 = prng_rand_n (dst_height);
 	    clip_boxes[i].x2 =
-		clip_boxes[i].x1 + lcg_rand_n (dst_width - clip_boxes[i].x1);
+		clip_boxes[i].x1 + prng_rand_n (dst_width - clip_boxes[i].x1);
 	    clip_boxes[i].y2 =
-		clip_boxes[i].y1 + lcg_rand_n (dst_height - clip_boxes[i].y1);
+		clip_boxes[i].y1 + prng_rand_n (dst_height - clip_boxes[i].y1);
 
 	    if (verbose)
 	    {
diff --git a/test/composite.c b/test/composite.c
index 2930fb7..09752c5 100644
--- a/test/composite.c
+++ b/test/composite.c
@@ -725,19 +725,19 @@ image_fini (image_t *info)
 static int
 random_size (void)
 {
-    return lcg_rand_n (ARRAY_LENGTH (sizes));
+    return prng_rand_n (ARRAY_LENGTH (sizes));
 }
 
 static int
 random_color (void)
 {
-    return lcg_rand_n (ARRAY_LENGTH (colors));
+    return prng_rand_n (ARRAY_LENGTH (colors));
 }
 
 static int
 random_format (void)
 {
-    return lcg_rand_n (ARRAY_LENGTH (formats));
+    return prng_rand_n (ARRAY_LENGTH (formats));
 }
 
 static pixman_bool_t
@@ -748,15 +748,15 @@ run_test (uint32_t seed)
     int ca;
     int ok;
 
-    lcg_srand (seed);
+    prng_srand (seed);
 
     image_init (&dst, random_color(), random_format(), 1);
     image_init (&src, random_color(), random_format(), random_size());
     image_init (&mask, random_color(), random_format(), random_size());
 
-    op = &(operators [lcg_rand_n (ARRAY_LENGTH (operators))]);
+    op = &(operators [prng_rand_n (ARRAY_LENGTH (operators))]);
 
-    ca = lcg_rand_n (3);
+    ca = prng_rand_n (3);
 
     switch (ca)
     {
diff --git a/test/glyph-test.c b/test/glyph-test.c
index 501cc2e..2fcc69c 100644
--- a/test/glyph-test.c
+++ b/test/glyph-test.c
@@ -107,7 +107,7 @@ random_format (const pixman_format_code_t *formats)
     i = 0;
     while (formats[i] != PIXMAN_null)
 	++i;
-    return formats[lcg_rand_n (i)];
+    return formats[prng_rand_n (i)];
 }
 
 static pixman_image_t *
@@ -122,27 +122,27 @@ create_image (int max_size, const pixman_format_code_t *formats, uint32_t flags)
     int i;
     pixman_image_destroy_func_t destroy;
 
-    if ((flags & ALLOW_SOLID) && lcg_rand_n (4) == 0)
+    if ((flags & ALLOW_SOLID) && prng_rand_n (4) == 0)
     {
 	pixman_color_t color;
 
-	color.alpha = lcg_rand_u32();
-	color.red = lcg_rand_u32();
-	color.green = lcg_rand_u32();
-	color.blue = lcg_rand_u32();
+	color.alpha = prng_rand_u32();
+	color.red = prng_rand_u32();
+	color.green = prng_rand_u32();
+	color.blue = prng_rand_u32();
 
 	return pixman_image_create_solid_fill (&color);
     }
 
-    width = lcg_rand_n (max_size) + 1;
-    height = lcg_rand_n (max_size) + 1;
+    width = prng_rand_n (max_size) + 1;
+    height = prng_rand_n (max_size) + 1;
     format = random_format (formats);
 
     bpp = PIXMAN_FORMAT_BPP (format);
-    stride = (width * bpp + 7) / 8 + lcg_rand_n (17);
+    stride = (width * bpp + 7) / 8 + prng_rand_n (17);
     stride = (stride + 3) & ~3;
 
-    if (lcg_rand_n (64) == 0)
+    if (prng_rand_n (64) == 0)
     {
 	if (!(data = (uint32_t *)make_random_bytes (stride * height)))
 	{
@@ -159,7 +159,7 @@ create_image (int max_size, const pixman_format_code_t *formats, uint32_t flags)
 
 	d8 = (uint8_t *)data;
 	for (i = 0; i < height * stride; ++i)
-	    d8[i] = lcg_rand_n (256);
+	    d8[i] = prng_rand_n (256);
 
 	destroy = destroy_malloced;
     }
@@ -167,20 +167,20 @@ create_image (int max_size, const pixman_format_code_t *formats, uint32_t flags)
     image = pixman_image_create_bits (format, width, height, data, stride);
     pixman_image_set_destroy_function (image, destroy, data);
 
-    if ((flags & ALLOW_CLIPPED) && lcg_rand_n (8) == 0)
+    if ((flags & ALLOW_CLIPPED) && prng_rand_n (8) == 0)
     {
 	pixman_box16_t clip_boxes[8];
 	pixman_region16_t clip;
-	int n = lcg_rand_n (8) + 1;
+	int n = prng_rand_n (8) + 1;
 
 	for (i = 0; i < n; i++)
 	{
-	    clip_boxes[i].x1 = lcg_rand_n (width);
-	    clip_boxes[i].y1 = lcg_rand_n (height);
+	    clip_boxes[i].x1 = prng_rand_n (width);
+	    clip_boxes[i].y1 = prng_rand_n (height);
 	    clip_boxes[i].x2 =
-		clip_boxes[i].x1 + lcg_rand_n (width - clip_boxes[i].x1);
+		clip_boxes[i].x1 + prng_rand_n (width - clip_boxes[i].x1);
 	    clip_boxes[i].y2 =
-		clip_boxes[i].y1 + lcg_rand_n (height - clip_boxes[i].y1);
+		clip_boxes[i].y1 + prng_rand_n (height - clip_boxes[i].y1);
 	}
 
 	pixman_region_init_rects (&clip, clip_boxes, n);
@@ -188,27 +188,27 @@ create_image (int max_size, const pixman_format_code_t *formats, uint32_t flags)
 	pixman_region_fini (&clip);
     }
 
-    if ((flags & ALLOW_SOURCE_CLIPPING) && lcg_rand_n (4) == 0)
+    if ((flags & ALLOW_SOURCE_CLIPPING) && prng_rand_n (4) == 0)
     {
 	pixman_image_set_source_clipping (image, TRUE);
 	pixman_image_set_has_client_clip (image, TRUE);
     }
 
-    if ((flags & ALLOW_ALPHA_MAP) && lcg_rand_n (16) == 0)
+    if ((flags & ALLOW_ALPHA_MAP) && prng_rand_n (16) == 0)
     {
 	pixman_image_t *alpha_map;
 	int alpha_x, alpha_y;
 
-	alpha_x = lcg_rand_n (width);
-	alpha_y = lcg_rand_n (height);
+	alpha_x = prng_rand_n (width);
+	alpha_y = prng_rand_n (height);
 	alpha_map =
 	    create_image (max_size, formats, (flags & ~(ALLOW_ALPHA_MAP | ALLOW_SOLID)));
 	pixman_image_set_alpha_map (image, alpha_map, alpha_x, alpha_y);
 	pixman_image_unref (alpha_map);
     }
 
-    if ((flags & ALLOW_REPEAT) && lcg_rand_n (2) == 0)
-	pixman_image_set_repeat (image, lcg_rand_n (4));
+    if ((flags & ALLOW_REPEAT) && prng_rand_n (2) == 0)
+	pixman_image_set_repeat (image, prng_rand_n (4));
 
     image_endian_swap (image);
 
@@ -230,7 +230,7 @@ test_glyphs (int testnum, int verbose)
     int n_glyphs, i;
     pixman_glyph_cache_t *cache;
 
-    lcg_srand (testnum);
+    prng_srand (testnum);
 
     cache = pixman_glyph_cache_create ();
 
@@ -245,13 +245,13 @@ test_glyphs (int testnum, int verbose)
 
     pixman_glyph_cache_freeze (cache);
 
-    n_glyphs = lcg_rand_n (MAX_GLYPHS);
+    n_glyphs = prng_rand_n (MAX_GLYPHS);
     for (i = 0; i < n_glyphs; ++i)
 	glyph_images[i] = create_image (32, glyph_formats, 0);
 
     for (i = 0; i < 4 * n_glyphs; ++i)
     {
-	int g = lcg_rand_n (n_glyphs);
+	int g = prng_rand_n (n_glyphs);
 	pixman_image_t *glyph_img = glyph_images[g];
 	void *key1 = KEY1 (glyph_img);
 	void *key2 = KEY2 (glyph_img);
@@ -264,21 +264,21 @@ test_glyphs (int testnum, int verbose)
 	}
 
 	glyphs[i].glyph = glyph;
-	glyphs[i].x = lcg_rand_n (128);
-	glyphs[i].y = lcg_rand_n (128);
+	glyphs[i].x = prng_rand_n (128);
+	glyphs[i].y = prng_rand_n (128);
     }
 
-    if (lcg_rand_n (2) == 0)
+    if (prng_rand_n (2) == 0)
     {
-	int src_x = lcg_rand_n (300) - 150;
-	int src_y = lcg_rand_n (300) - 150;
-	int mask_x = lcg_rand_n (64) - 32;
-	int mask_y = lcg_rand_n (64) - 32;
-	int dest_x = lcg_rand_n (64) - 32;
-	int dest_y = lcg_rand_n (64) - 32;
-	int width = lcg_rand_n (64);
-	int height = lcg_rand_n (64);
-	pixman_op_t op = operators[lcg_rand_n (ARRAY_LENGTH (operators))];
+	int src_x = prng_rand_n (300) - 150;
+	int src_y = prng_rand_n (300) - 150;
+	int mask_x = prng_rand_n (64) - 32;
+	int mask_y = prng_rand_n (64) - 32;
+	int dest_x = prng_rand_n (64) - 32;
+	int dest_y = prng_rand_n (64) - 32;
+	int width = prng_rand_n (64);
+	int height = prng_rand_n (64);
+	pixman_op_t op = operators[prng_rand_n (ARRAY_LENGTH (operators))];
 	pixman_format_code_t format = random_format (glyph_formats);
 
 	pixman_composite_glyphs (
@@ -292,11 +292,11 @@ test_glyphs (int testnum, int verbose)
     }
     else
     {
-	pixman_op_t op = operators[lcg_rand_n (ARRAY_LENGTH (operators))];
-	int src_x = lcg_rand_n (300) - 150;
-	int src_y = lcg_rand_n (300) - 150;
-	int dest_x = lcg_rand_n (64) - 32;
-	int dest_y = lcg_rand_n (64) - 32;
+	pixman_op_t op = operators[prng_rand_n (ARRAY_LENGTH (operators))];
+	int src_x = prng_rand_n (300) - 150;
+	int src_y = prng_rand_n (300) - 150;
+	int dest_x = prng_rand_n (64) - 32;
+	int dest_y = prng_rand_n (64) - 32;
 
 	pixman_composite_glyphs_no_mask (
 	    op, source, dest,
diff --git a/test/region-contains-test.c b/test/region-contains-test.c
index 9524e28..aca24ad 100644
--- a/test/region-contains-test.c
+++ b/test/region-contains-test.c
@@ -9,16 +9,16 @@ make_random_region (pixman_region32_t *region)
 
     pixman_region32_init (region);
 
-    n_boxes = lcg_rand_n (64);
+    n_boxes = prng_rand_n (64);
     while (n_boxes--)
     {
 	int32_t x, y;
 	uint32_t w, h;
 
-	x = (int32_t)lcg_rand_u32() >> 2;
-	y = (int32_t)lcg_rand_u32() >> 2;
-	w = lcg_rand_u32() >> 2;
-	h = lcg_rand_u32() >> 2;
+	x = (int32_t)prng_rand_u32() >> 2;
+	y = (int32_t)prng_rand_u32() >> 2;
+	w = prng_rand_u32() >> 2;
+	h = prng_rand_u32() >> 2;
 
 	pixman_region32_union_rect (region, region, x, y, w, h);
     }
@@ -37,12 +37,12 @@ random_coord (pixman_region32_t *region, pixman_bool_t x)
     int n_boxes;
     int begin, end;
 
-    if (lcg_rand_n (14))
+    if (prng_rand_n (14))
     {
 	bb = pixman_region32_rectangles (region, &n_boxes);
 	if (n_boxes == 0)
 	    goto use_extent;
-	b = bb + lcg_rand_n (n_boxes);
+	b = bb + prng_rand_n (n_boxes);
     }
     else
     {
@@ -62,12 +62,12 @@ random_coord (pixman_region32_t *region, pixman_bool_t x)
 	end = b->y2;
     }
 
-    switch (lcg_rand_n (5))
+    switch (prng_rand_n (5))
     {
     case 0:
-	return begin - lcg_rand_u32();
+	return begin - prng_rand_u32();
     case 1:
-	return end + lcg_rand_u32 ();
+	return end + prng_rand_u32 ();
     case 2:
 	return end;
     case 3:
@@ -111,14 +111,14 @@ test_region_contains_rectangle (int i, int verbose)
     pixman_region32_t region;
     uint32_t r, r1, r2, r3, r4, crc32;
 
-    lcg_srand (i);
+    prng_srand (i);
 
     make_random_region (&region);
 
     box.x1 = random_coord (&region, TRUE);
-    box.x2 = box.x1 + lcg_rand_u32 ();
+    box.x2 = box.x1 + prng_rand_u32 ();
     box.y1 = random_coord (&region, FALSE);
-    box.y2 = box.y1 + lcg_rand_u32 ();
+    box.y2 = box.y1 + prng_rand_u32 ();
 
     if (verbose)
     {
diff --git a/test/region-test.c b/test/region-test.c
index 9d5a41e..87010f7 100644
--- a/test/region-test.c
+++ b/test/region-test.c
@@ -91,10 +91,10 @@ main ()
 	/* Add some random rectangles */
 	for (j = 0; j < 64; j++)
 	    pixman_region32_union_rect (&r1, &r1,
-					lcg_rand_n (image_size),
-					lcg_rand_n (image_size),
-					lcg_rand_n (25),
-					lcg_rand_n (25));
+					prng_rand_n (image_size),
+					prng_rand_n (image_size),
+					prng_rand_n (25),
+					prng_rand_n (25));
 
 	/* Clip to image size */
 	pixman_region32_init_rect (&r2, 0, 0, image_size, image_size);
diff --git a/test/rotate-test.c b/test/rotate-test.c
index a0488ef..0fe9301 100644
--- a/test/rotate-test.c
+++ b/test/rotate-test.c
@@ -43,13 +43,13 @@ static const pixman_transform_t transforms[] =
 };
 
 #define RANDOM_FORMAT()							\
-    (formats[lcg_rand_n (ARRAY_LENGTH (formats))])
+    (formats[prng_rand_n (ARRAY_LENGTH (formats))])
 
 #define RANDOM_OP()							\
-    (ops[lcg_rand_n (ARRAY_LENGTH (ops))])
+    (ops[prng_rand_n (ARRAY_LENGTH (ops))])
 
 #define RANDOM_TRANSFORM()						\
-    (&(transforms[lcg_rand_n (ARRAY_LENGTH (transforms))]))
+    (&(transforms[prng_rand_n (ARRAY_LENGTH (transforms))]))
 
 static void
 on_destroy (pixman_image_t *image, void *data)
@@ -66,7 +66,7 @@ make_image (void)
     int i;
 
     for (i = 0; i < WIDTH * HEIGHT * 4; ++i)
-	((uint8_t *)bytes)[i] = lcg_rand_n (256);
+	((uint8_t *)bytes)[i] = prng_rand_n (256);
 
     image = pixman_image_create_bits (
 	format, WIDTH, HEIGHT, bytes, WIDTH * 4);
@@ -86,7 +86,7 @@ test_transform (int testnum, int verbose)
     pixman_image_t *src, *dest;
     uint32_t crc;
 
-    lcg_srand (testnum);
+    prng_srand (testnum);
     
     src = make_image ();
     dest = make_image ();
diff --git a/test/scaling-helpers-test.c b/test/scaling-helpers-test.c
index 33ec47c..a706020 100644
--- a/test/scaling-helpers-test.c
+++ b/test/scaling-helpers-test.c
@@ -56,10 +56,10 @@ main (void)
     {
 	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 = lcg_rand_N(10000 << 16) - (3000 << 16);
-	int32_t width = lcg_rand_N(10000);
-	int32_t source_image_width = lcg_rand_N(10000) + 1;
-	pixman_fixed_t unit_x = lcg_rand_N(10 << 16) + 1;
+	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,
diff --git a/test/scaling-test.c b/test/scaling-test.c
index 0354103..cfe9b52 100644
--- a/test/scaling-test.c
+++ b/test/scaling-test.c
@@ -26,7 +26,7 @@ get_format (int bpp)
 {
     if (bpp == 4)
     {
-	switch (lcg_rand_n (4))
+	switch (prng_rand_n (4))
 	{
 	default:
 	case 0:
@@ -80,11 +80,11 @@ test_composite (int      testnum,
     uint32_t           crc32;
     FLOAT_REGS_CORRUPTION_DETECTOR_START ();
 
-    lcg_srand (testnum);
+    prng_srand (testnum);
 
-    src_bpp = (lcg_rand_n (2) == 0) ? 2 : 4;
-    dst_bpp = (lcg_rand_n (2) == 0) ? 2 : 4;
-    switch (lcg_rand_n (3))
+    src_bpp = (prng_rand_n (2) == 0) ? 2 : 4;
+    dst_bpp = (prng_rand_n (2) == 0) ? 2 : 4;
+    switch (prng_rand_n (3))
     {
     case 0:
 	op = PIXMAN_OP_SRC;
@@ -97,24 +97,24 @@ test_composite (int      testnum,
 	break;
     }
 
-    src_width = lcg_rand_n (MAX_SRC_WIDTH) + 1;
-    src_height = lcg_rand_n (MAX_SRC_HEIGHT) + 1;
+    src_width = prng_rand_n (MAX_SRC_WIDTH) + 1;
+    src_height = prng_rand_n (MAX_SRC_HEIGHT) + 1;
 
-    if (lcg_rand_n (2))
+    if (prng_rand_n (2))
     {
-	mask_width = lcg_rand_n (MAX_SRC_WIDTH) + 1;
-	mask_height = lcg_rand_n (MAX_SRC_HEIGHT) + 1;
+	mask_width = prng_rand_n (MAX_SRC_WIDTH) + 1;
+	mask_height = prng_rand_n (MAX_SRC_HEIGHT) + 1;
     }
     else
     {
 	mask_width = mask_height = 1;
     }
 
-    dst_width = lcg_rand_n (MAX_DST_WIDTH) + 1;
-    dst_height = lcg_rand_n (MAX_DST_HEIGHT) + 1;
-    src_stride = src_width * src_bpp + lcg_rand_n (MAX_STRIDE) * src_bpp;
-    mask_stride = mask_width * mask_bpp + lcg_rand_n (MAX_STRIDE) * mask_bpp;
-    dst_stride = dst_width * dst_bpp + lcg_rand_n (MAX_STRIDE) * dst_bpp;
+    dst_width = prng_rand_n (MAX_DST_WIDTH) + 1;
+    dst_height = prng_rand_n (MAX_DST_HEIGHT) + 1;
+    src_stride = src_width * src_bpp + prng_rand_n (MAX_STRIDE) * src_bpp;
+    mask_stride = mask_width * mask_bpp + prng_rand_n (MAX_STRIDE) * mask_bpp;
+    dst_stride = dst_width * dst_bpp + prng_rand_n (MAX_STRIDE) * dst_bpp;
 
     if (src_stride & 3)
 	src_stride += 2;
@@ -127,27 +127,27 @@ test_composite (int      testnum,
     if (dst_stride & 3)
 	dst_stride += 2;
 
-    src_x = -(src_width / 4) + lcg_rand_n (src_width * 3 / 2);
-    src_y = -(src_height / 4) + lcg_rand_n (src_height * 3 / 2);
-    mask_x = -(mask_width / 4) + lcg_rand_n (mask_width * 3 / 2);
-    mask_y = -(mask_height / 4) + lcg_rand_n (mask_height * 3 / 2);
-    dst_x = -(dst_width / 4) + lcg_rand_n (dst_width * 3 / 2);
-    dst_y = -(dst_height / 4) + lcg_rand_n (dst_height * 3 / 2);
-    w = lcg_rand_n (dst_width * 3 / 2 - dst_x);
-    h = lcg_rand_n (dst_height * 3 / 2 - dst_y);
+    src_x = -(src_width / 4) + prng_rand_n (src_width * 3 / 2);
+    src_y = -(src_height / 4) + prng_rand_n (src_height * 3 / 2);
+    mask_x = -(mask_width / 4) + prng_rand_n (mask_width * 3 / 2);
+    mask_y = -(mask_height / 4) + prng_rand_n (mask_height * 3 / 2);
+    dst_x = -(dst_width / 4) + prng_rand_n (dst_width * 3 / 2);
+    dst_y = -(dst_height / 4) + prng_rand_n (dst_height * 3 / 2);
+    w = prng_rand_n (dst_width * 3 / 2 - dst_x);
+    h = prng_rand_n (dst_height * 3 / 2 - dst_y);
 
     srcbuf = (uint32_t *)malloc (src_stride * src_height);
     maskbuf = (uint32_t *)malloc (mask_stride * mask_height);
     dstbuf = (uint32_t *)malloc (dst_stride * dst_height);
 
     for (i = 0; i < src_stride * src_height; i++)
-	*((uint8_t *)srcbuf + i) = lcg_rand_n (256);
+	*((uint8_t *)srcbuf + i) = prng_rand_n (256);
 
     for (i = 0; i < mask_stride * mask_height; i++)
-	*((uint8_t *)maskbuf + i) = lcg_rand_n (256);
+	*((uint8_t *)maskbuf + i) = prng_rand_n (256);
 
     for (i = 0; i < dst_stride * dst_height; i++)
-	*((uint8_t *)dstbuf + i) = lcg_rand_n (256);
+	*((uint8_t *)dstbuf + i) = prng_rand_n (256);
 
     src_fmt = get_format (src_bpp);
     dst_fmt = get_format (dst_bpp);
@@ -164,29 +164,29 @@ test_composite (int      testnum,
     image_endian_swap (src_img);
     image_endian_swap (dst_img);
 
-    if (lcg_rand_n (4) > 0)
+    if (prng_rand_n (4) > 0)
     {
-	scale_x = -32768 * 3 + lcg_rand_N (65536 * 5);
-	scale_y = -32768 * 3 + lcg_rand_N (65536 * 5);
-	translate_x = lcg_rand_N (65536);
-	translate_y = lcg_rand_N (65536);
+	scale_x = -32768 * 3 + prng_rand_N (65536 * 5);
+	scale_y = -32768 * 3 + prng_rand_N (65536 * 5);
+	translate_x = prng_rand_N (65536);
+	translate_y = prng_rand_N (65536);
 	pixman_transform_init_scale (&transform, scale_x, scale_y);
 	pixman_transform_translate (&transform, NULL, translate_x, translate_y);
 	pixman_image_set_transform (src_img, &transform);
     }
 
-    if (lcg_rand_n (2) > 0)
+    if (prng_rand_n (2) > 0)
     {
-	mask_scale_x = -32768 * 3 + lcg_rand_N (65536 * 5);
-	mask_scale_y = -32768 * 3 + lcg_rand_N (65536 * 5);
-	mask_translate_x = lcg_rand_N (65536);
-	mask_translate_y = lcg_rand_N (65536);
+	mask_scale_x = -32768 * 3 + prng_rand_N (65536 * 5);
+	mask_scale_y = -32768 * 3 + prng_rand_N (65536 * 5);
+	mask_translate_x = prng_rand_N (65536);
+	mask_translate_y = prng_rand_N (65536);
 	pixman_transform_init_scale (&transform, mask_scale_x, mask_scale_y);
 	pixman_transform_translate (&transform, NULL, mask_translate_x, mask_translate_y);
 	pixman_image_set_transform (mask_img, &transform);
     }
 
-    switch (lcg_rand_n (4))
+    switch (prng_rand_n (4))
     {
     case 0:
 	mask_repeat = PIXMAN_REPEAT_NONE;
@@ -209,7 +209,7 @@ test_composite (int      testnum,
     }
     pixman_image_set_repeat (mask_img, mask_repeat);
 
-    switch (lcg_rand_n (4))
+    switch (prng_rand_n (4))
     {
     case 0:
 	repeat = PIXMAN_REPEAT_NONE;
@@ -232,12 +232,12 @@ test_composite (int      testnum,
     }
     pixman_image_set_repeat (src_img, repeat);
 
-    if (lcg_rand_n (2))
+    if (prng_rand_n (2))
 	pixman_image_set_filter (src_img, PIXMAN_FILTER_NEAREST, NULL, 0);
     else
 	pixman_image_set_filter (src_img, PIXMAN_FILTER_BILINEAR, NULL, 0);
 
-    if (lcg_rand_n (2))
+    if (prng_rand_n (2))
 	pixman_image_set_filter (mask_img, PIXMAN_FILTER_NEAREST, NULL, 0);
     else
 	pixman_image_set_filter (mask_img, PIXMAN_FILTER_BILINEAR, NULL, 0);
@@ -256,19 +256,19 @@ test_composite (int      testnum,
 	printf ("w=%d, h=%d\n", w, h);
     }
 
-    if (lcg_rand_n (8) == 0)
+    if (prng_rand_n (8) == 0)
     {
 	pixman_box16_t clip_boxes[2];
-	int            n = lcg_rand_n (2) + 1;
+	int            n = prng_rand_n (2) + 1;
 
 	for (i = 0; i < n; i++)
 	{
-	    clip_boxes[i].x1 = lcg_rand_n (src_width);
-	    clip_boxes[i].y1 = lcg_rand_n (src_height);
+	    clip_boxes[i].x1 = prng_rand_n (src_width);
+	    clip_boxes[i].y1 = prng_rand_n (src_height);
 	    clip_boxes[i].x2 =
-		clip_boxes[i].x1 + lcg_rand_n (src_width - clip_boxes[i].x1);
+		clip_boxes[i].x1 + prng_rand_n (src_width - clip_boxes[i].x1);
 	    clip_boxes[i].y2 =
-		clip_boxes[i].y1 + lcg_rand_n (src_height - clip_boxes[i].y1);
+		clip_boxes[i].y1 + prng_rand_n (src_height - clip_boxes[i].y1);
 
 	    if (verbose)
 	    {
@@ -284,19 +284,19 @@ test_composite (int      testnum,
 	pixman_region_fini (&clip);
     }
 
-    if (lcg_rand_n (8) == 0)
+    if (prng_rand_n (8) == 0)
     {
 	pixman_box16_t clip_boxes[2];
-	int            n = lcg_rand_n (2) + 1;
+	int            n = prng_rand_n (2) + 1;
 
 	for (i = 0; i < n; i++)
 	{
-	    clip_boxes[i].x1 = lcg_rand_n (mask_width);
-	    clip_boxes[i].y1 = lcg_rand_n (mask_height);
+	    clip_boxes[i].x1 = prng_rand_n (mask_width);
+	    clip_boxes[i].y1 = prng_rand_n (mask_height);
 	    clip_boxes[i].x2 =
-		clip_boxes[i].x1 + lcg_rand_n (mask_width - clip_boxes[i].x1);
+		clip_boxes[i].x1 + prng_rand_n (mask_width - clip_boxes[i].x1);
 	    clip_boxes[i].y2 =
-		clip_boxes[i].y1 + lcg_rand_n (mask_height - clip_boxes[i].y1);
+		clip_boxes[i].y1 + prng_rand_n (mask_height - clip_boxes[i].y1);
 
 	    if (verbose)
 	    {
@@ -312,18 +312,18 @@ test_composite (int      testnum,
 	pixman_region_fini (&clip);
     }
 
-    if (lcg_rand_n (8) == 0)
+    if (prng_rand_n (8) == 0)
     {
 	pixman_box16_t clip_boxes[2];
-	int            n = lcg_rand_n (2) + 1;
+	int            n = prng_rand_n (2) + 1;
 	for (i = 0; i < n; i++)
 	{
-	    clip_boxes[i].x1 = lcg_rand_n (dst_width);
-	    clip_boxes[i].y1 = lcg_rand_n (dst_height);
+	    clip_boxes[i].x1 = prng_rand_n (dst_width);
+	    clip_boxes[i].y1 = prng_rand_n (dst_height);
 	    clip_boxes[i].x2 =
-		clip_boxes[i].x1 + lcg_rand_n (dst_width - clip_boxes[i].x1);
+		clip_boxes[i].x1 + prng_rand_n (dst_width - clip_boxes[i].x1);
 	    clip_boxes[i].y2 =
-		clip_boxes[i].y1 + lcg_rand_n (dst_height - clip_boxes[i].y1);
+		clip_boxes[i].y1 + prng_rand_n (dst_height - clip_boxes[i].y1);
 
 	    if (verbose)
 	    {
@@ -337,7 +337,7 @@ test_composite (int      testnum,
 	pixman_region_fini (&clip);
     }
 
-    if (lcg_rand_n (2) == 0)
+    if (prng_rand_n (2) == 0)
 	pixman_image_composite (op, src_img, NULL, dst_img,
                             src_x, src_y, 0, 0, dst_x, dst_y, w, h);
     else
diff --git a/test/stress-test.c b/test/stress-test.c
index 059250d..8b99904 100644
--- a/test/stress-test.c
+++ b/test/stress-test.c
@@ -74,7 +74,7 @@ static pixman_filter_t filters[] =
 static int
 get_size (void)
 {
-    switch (lcg_rand_n (28))
+    switch (prng_rand_n (28))
     {
     case 0:
 	return 1;
@@ -84,10 +84,10 @@ get_size (void)
 
     default:
     case 2:
-	return lcg_rand_n (100);
+	return prng_rand_n (100);
 
     case 4:
-	return lcg_rand_n (2000) + 1000;
+	return prng_rand_n (2000) + 1000;
 
     case 5:
 	return 65535;
@@ -96,7 +96,7 @@ get_size (void)
 	return 65536;
 
     case 7:
-	return lcg_rand_N (64000) + 63000;
+	return prng_rand_N (64000) + 63000;
     }
 }
 
@@ -164,7 +164,7 @@ real_writer (void *src, uint32_t value, int size)
 static uint32_t
 fake_reader (const void *src, int size)
 {
-    uint32_t r = lcg_rand_u32 ();
+    uint32_t r = prng_rand_u32 ();
 
     assert (size == 1 || size == 2 || size == 4);
 
@@ -182,16 +182,16 @@ log_rand (void)
 {
     uint32_t mask;
 
-    mask = (1 << lcg_rand_n (10)) - 1;
+    mask = (1 << prng_rand_n (10)) - 1;
 
-    return (lcg_rand_u32 () & mask) - (mask >> 1);
+    return (prng_rand_u32 () & mask) - (mask >> 1);
 }
 
 static int32_t
 rand_x (pixman_image_t *image)
 {
     if (image->type == BITS)
-	return lcg_rand_n (image->bits.width);
+	return prng_rand_n (image->bits.width);
     else
 	return log_rand ();
 }
@@ -200,7 +200,7 @@ static int32_t
 rand_y (pixman_image_t *image)
 {
     if (image->type == BITS)
-	return lcg_rand_n (image->bits.height);
+	return prng_rand_n (image->bits.height);
     else
 	return log_rand ();
 }
@@ -220,7 +220,7 @@ create_random_bits_image (void)
     int n_coefficients = 0;
 
     /* format */
-    format = image_formats[lcg_rand_n (ARRAY_LENGTH (image_formats))];
+    format = image_formats[prng_rand_n (ARRAY_LENGTH (image_formats))];
 
     indexed = NULL;
     if (PIXMAN_FORMAT_TYPE (format) == PIXMAN_TYPE_COLOR)
@@ -246,7 +246,7 @@ create_random_bits_image (void)
 
     while ((uint64_t)width * height > 200000)
     {
-	if (lcg_rand_n(2) == 0)
+	if (prng_rand_n(2) == 0)
 	    height = 200000 / width;
 	else
 	    width = 200000 / height;
@@ -258,11 +258,11 @@ create_random_bits_image (void)
 	width = 1;
 
     /* bits */
-    switch (lcg_rand_n (7))
+    switch (prng_rand_n (7))
     {
     default:
     case 0:
-	stride = width * PIXMAN_FORMAT_BPP (format) + lcg_rand_n (17);
+	stride = width * PIXMAN_FORMAT_BPP (format) + prng_rand_n (17);
 	stride = (stride + 3) & (~3);
 	bits = (uint32_t *)make_random_bytes (height * stride);
 	break;
@@ -273,7 +273,7 @@ create_random_bits_image (void)
 	break;
 
     case 2: /* Zero-filled */
-	stride = width * PIXMAN_FORMAT_BPP (format) + lcg_rand_n (17);
+	stride = width * PIXMAN_FORMAT_BPP (format) + prng_rand_n (17);
 	stride = (stride + 3) & (~3);
 	bits = fence_malloc (height * stride);
 	if (!bits)
@@ -282,7 +282,7 @@ create_random_bits_image (void)
 	break;
 
     case 3: /* Filled with 0xFF */
-	stride = width * PIXMAN_FORMAT_BPP (format) + lcg_rand_n (17);
+	stride = width * PIXMAN_FORMAT_BPP (format) + prng_rand_n (17);
 	stride = (stride + 3) & (~3);
 	bits = fence_malloc (height * stride);
 	if (!bits)
@@ -298,7 +298,7 @@ create_random_bits_image (void)
 	break;
 
     case 5: /* bits is a real pointer, has read/write functions */
-	stride = width * PIXMAN_FORMAT_BPP (format) + lcg_rand_n (17);
+	stride = width * PIXMAN_FORMAT_BPP (format) + prng_rand_n (17);
 	stride = (stride + 3) & (~3);
 	bits = fence_malloc (height * stride);
 	if (!bits)
@@ -309,7 +309,7 @@ create_random_bits_image (void)
 	break;
 
     case 6: /* bits is a real pointer, stride is negative */
-	stride = (width * PIXMAN_FORMAT_BPP (format) + lcg_rand_n (17));
+	stride = (width * PIXMAN_FORMAT_BPP (format) + prng_rand_n (17));
 	stride = (stride + 3) & (~3);
 	bits = (uint32_t *)make_random_bytes (height * stride);
 	if (!bits)
@@ -320,11 +320,11 @@ create_random_bits_image (void)
     }
 
     /* Filter */
-    filter = filters[lcg_rand_n (ARRAY_LENGTH (filters))];
+    filter = filters[prng_rand_n (ARRAY_LENGTH (filters))];
     if (filter == PIXMAN_FILTER_CONVOLUTION)
     {
-	int width = lcg_rand_n (3);
-	int height = lcg_rand_n (4);
+	int width = prng_rand_n (3);
+	int height = prng_rand_n (4);
 
 	n_coefficients = width * height + 2;
 	coefficients = malloc (n_coefficients * sizeof (pixman_fixed_t));
@@ -334,7 +334,7 @@ create_random_bits_image (void)
 	    int i;
 
 	    for (i = 0; i < width * height; ++i)
-		coefficients[i + 2] = lcg_rand_u32();
+		coefficients[i + 2] = prng_rand_u32();
 
 	    coefficients[0] = width << 16;
 	    coefficients[1] = height << 16;
@@ -380,11 +380,11 @@ set_general_properties (pixman_image_t *image, pixman_bool_t allow_alpha_map)
     /* Set properties that are generic to all images */
 
     /* Repeat */
-    repeat = repeats[lcg_rand_n (ARRAY_LENGTH (repeats))];
+    repeat = repeats[prng_rand_n (ARRAY_LENGTH (repeats))];
     pixman_image_set_repeat (image, repeat);
 
     /* Alpha map */
-    if (allow_alpha_map && lcg_rand_n (4) == 0)
+    if (allow_alpha_map && prng_rand_n (4) == 0)
     {
 	pixman_image_t *alpha_map;
 	int16_t x, y;
@@ -405,17 +405,17 @@ set_general_properties (pixman_image_t *image, pixman_bool_t allow_alpha_map)
     }
 
     /* Component alpha */
-    pixman_image_set_component_alpha (image, lcg_rand_n (3) == 0);
+    pixman_image_set_component_alpha (image, prng_rand_n (3) == 0);
 
     /* Clip region */
-    if (lcg_rand_n (8) < 2)
+    if (prng_rand_n (8) < 2)
     {
 	pixman_region32_t region;
 	int i, n_rects;
 
 	pixman_region32_init (&region);
 
-	switch (lcg_rand_n (12))
+	switch (prng_rand_n (12))
 	{
 	case 0:
 	    n_rects = 0;
@@ -434,7 +434,7 @@ set_general_properties (pixman_image_t *image, pixman_bool_t allow_alpha_map)
 	    break;
 
 	default:
-	    n_rects = lcg_rand_n (100);
+	    n_rects = prng_rand_n (100);
 	    break;
 	}
 
@@ -452,7 +452,7 @@ set_general_properties (pixman_image_t *image, pixman_bool_t allow_alpha_map)
 		&region, &region, x, y, width, height);
 	}
 
-	if (image->type == BITS && lcg_rand_n (8) != 0)
+	if (image->type == BITS && prng_rand_n (8) != 0)
 	{
 	    uint32_t width, height;
 	    int x, y;
@@ -463,10 +463,10 @@ set_general_properties (pixman_image_t *image, pixman_bool_t allow_alpha_map)
 	     */
 	    for (i = 0; i < 5; ++i)
 	    {
-		x = lcg_rand_n (2 * image->bits.width) - image->bits.width;
-		y = lcg_rand_n (2 * image->bits.height) - image->bits.height;
-		width = lcg_rand_n (image->bits.width) - x + 10;
-		height = lcg_rand_n (image->bits.height) - y + 10;
+		x = prng_rand_n (2 * image->bits.width) - image->bits.width;
+		y = prng_rand_n (2 * image->bits.height) - image->bits.height;
+		width = prng_rand_n (image->bits.width) - x + 10;
+		height = prng_rand_n (image->bits.height) - y + 10;
 
 		if (width + x < x)
 		    width = INT32_MAX - x;
@@ -484,13 +484,13 @@ set_general_properties (pixman_image_t *image, pixman_bool_t allow_alpha_map)
     }
 
     /* Whether source clipping is enabled */
-    pixman_image_set_source_clipping (image, !!lcg_rand_n (2));
+    pixman_image_set_source_clipping (image, !!prng_rand_n (2));
 
     /* Client clip */
-    pixman_image_set_has_client_clip (image, !!lcg_rand_n (2));
+    pixman_image_set_has_client_clip (image, !!prng_rand_n (2));
 
     /* Transform */
-    if (lcg_rand_n (5) < 2)
+    if (prng_rand_n (5) < 2)
     {
 	pixman_transform_t xform;
 	int i, j, k;
@@ -504,39 +504,39 @@ set_general_properties (pixman_image_t *image, pixman_bool_t allow_alpha_map)
 
 	for (k = 0; k < 3; ++k)
 	{
-	    switch (lcg_rand_n (4))
+	    switch (prng_rand_n (4))
 	    {
 	    case 0:
 		/* rotation */
-		c = lcg_rand_N (2 * 65536) - 65536;
-		s = lcg_rand_N (2 * 65536) - 65536;
+		c = prng_rand_N (2 * 65536) - 65536;
+		s = prng_rand_N (2 * 65536) - 65536;
 		pixman_transform_rotate (&xform, NULL, c, s);
 		break;
 
 	    case 1:
 		/* translation */
-		tx = lcg_rand_u32();
-		ty = lcg_rand_u32();
+		tx = prng_rand_u32();
+		ty = prng_rand_u32();
 		pixman_transform_translate (&xform, NULL, tx, ty);
 		break;
 
 	    case 2:
 		/* scale */
-		sx = lcg_rand_u32();
-		sy = lcg_rand_u32();
+		sx = prng_rand_u32();
+		sy = prng_rand_u32();
 		pixman_transform_scale (&xform, NULL, sx, sy);
 		break;
 
 	    case 3:
-		if (lcg_rand_n (16) == 0)
+		if (prng_rand_n (16) == 0)
 		{
 		    /* random */
 		    for (i = 0; i < 3; ++i)
 			for (j = 0; j < 3; ++j)
-			    xform.matrix[i][j] = lcg_rand_u32();
+			    xform.matrix[i][j] = prng_rand_u32();
 		    break;
 		}
-		else if (lcg_rand_n (16) == 0)
+		else if (prng_rand_n (16) == 0)
 		{
 		    /* zero */
 		    memset (&xform, 0, sizeof xform);
@@ -554,10 +554,10 @@ random_color (void)
 {
     pixman_color_t color =
     {
-	lcg_rand() & 0xffff,
-	lcg_rand() & 0xffff,
-	lcg_rand() & 0xffff,
-	lcg_rand() & 0xffff,
+	prng_rand() & 0xffff,
+	prng_rand() & 0xffff,
+	prng_rand() & 0xffff,
+	prng_rand() & 0xffff,
     };
 
     return color;
@@ -581,7 +581,7 @@ create_random_stops (int *n_stops)
     int i;
     pixman_gradient_stop_t *stops;
 
-    *n_stops = lcg_rand_n (50) + 1;
+    *n_stops = prng_rand_n (50) + 1;
 
     step = pixman_fixed_1 / *n_stops;
 
@@ -646,8 +646,8 @@ create_random_radial_image (void)
 
     inner_c = create_random_point();
     outer_c = create_random_point();
-    inner_r = lcg_rand();
-    outer_r = lcg_rand();
+    inner_r = prng_rand();
+    outer_r = prng_rand();
 
     stops = create_random_stops (&n_stops);
 
@@ -672,7 +672,7 @@ create_random_conical_image (void)
     pixman_image_t *result;
 
     c = create_random_point();
-    angle = lcg_rand();
+    angle = prng_rand();
 
     stops = create_random_stops (&n_stops);
 
@@ -691,7 +691,7 @@ create_random_image (void)
 {
     pixman_image_t *result;
 
-    switch (lcg_rand_n (5))
+    switch (prng_rand_n (5))
     {
     default:
     case 0:
@@ -793,7 +793,7 @@ run_test (uint32_t seed, pixman_bool_t verbose, uint32_t mod)
 	    printf ("Seed 0x%08x\n", seed);
     }
 	    
-    lcg_srand (seed);
+    prng_srand (seed);
 
     source = create_random_image ();
     mask   = create_random_image ();
@@ -803,7 +803,7 @@ run_test (uint32_t seed, pixman_bool_t verbose, uint32_t mod)
     {
 	set_general_properties (dest, TRUE);
 
-	op = op_list [lcg_rand_n (ARRAY_LENGTH (op_list))];
+	op = op_list [prng_rand_n (ARRAY_LENGTH (op_list))];
 
 	pixman_image_composite32 (op,
 				  source, mask, dest,
diff --git a/test/utils.c b/test/utils.c
index 00e74e5..c82ba2b 100644
--- a/test/utils.c
+++ b/test/utils.c
@@ -30,7 +30,7 @@
 /* Random number seed
  */
 
-uint32_t lcg_seed;
+uint32_t prng_seed;
 
 /*----------------------------------------------------------------------------*\
  *  CRC-32 version 2.0.0 by Craig Bruce, 2006-04-29.
@@ -429,7 +429,7 @@ make_random_bytes (int n_bytes)
 	return NULL;
 
     for (i = 0; i < n_bytes; ++i)
-	bytes[i] = lcg_rand () & 0xff;
+	bytes[i] = prng_rand () & 0xff;
 
     return bytes;
 }
@@ -681,9 +681,9 @@ get_random_seed (void)
 {
     union { double d; uint32_t u32; } t;
     t.d = gettime();
-    lcg_srand (t.u32);
+    prng_srand (t.u32);
 
-    return lcg_rand_u32 ();
+    return prng_rand_u32 ();
 }
 
 #ifdef HAVE_SIGACTION
@@ -777,7 +777,7 @@ initialize_palette (pixman_indexed_t *palette, uint32_t depth, int is_rgb)
     uint32_t mask = (1 << depth) - 1;
 
     for (i = 0; i < 32768; ++i)
-	palette->ent[i] = lcg_rand() & mask;
+	palette->ent[i] = prng_rand() & mask;
 
     memset (palette->rgba, 0, sizeof (palette->rgba));
 
@@ -797,7 +797,7 @@ initialize_palette (pixman_indexed_t *palette, uint32_t depth, int is_rgb)
 	{
 	    uint32_t old_idx;
 
-	    rgba24 = lcg_rand();
+	    rgba24 = prng_rand();
 	    i15 = CONVERT_15 (rgba24, is_rgb);
 
 	    old_idx = palette->ent[i15];
diff --git a/test/utils.h b/test/utils.h
index fa05587..ec4c4ad 100644
--- a/test/utils.h
+++ b/test/utils.h
@@ -11,47 +11,47 @@
  * taken from POSIX.1-2001 example
  */
 
-extern uint32_t lcg_seed;
+extern uint32_t prng_seed;
 #ifdef USE_OPENMP
-#pragma omp threadprivate(lcg_seed)
+#pragma omp threadprivate(prng_seed)
 #endif
 
 static inline uint32_t
-lcg_rand (void)
+prng_rand (void)
 {
-    lcg_seed = lcg_seed * 1103515245 + 12345;
-    return ((uint32_t)(lcg_seed / 65536) % 32768);
+    prng_seed = prng_seed * 1103515245 + 12345;
+    return ((uint32_t)(prng_seed / 65536) % 32768);
 }
 
 static inline void
-lcg_srand (uint32_t seed)
+prng_srand (uint32_t seed)
 {
-    lcg_seed = seed;
+    prng_seed = seed;
 }
 
 static inline uint32_t
-lcg_rand_n (int max)
+prng_rand_n (int max)
 {
-    return lcg_rand () % max;
+    return prng_rand () % max;
 }
 
 static inline uint32_t
-lcg_rand_N (int max)
+prng_rand_N (int max)
 {
-    uint32_t lo = lcg_rand ();
-    uint32_t hi = lcg_rand () << 15;
+    uint32_t lo = prng_rand ();
+    uint32_t hi = prng_rand () << 15;
     return (lo | hi) % max;
 }
 
 static inline uint32_t
-lcg_rand_u32 (void)
+prng_rand_u32 (void)
 {
     /* This uses the 10/11 most significant bits from the 3 lcg results
      * (and mixes them with the low from the adjacent one).
      */
-    uint32_t lo = lcg_rand() >> -(32 - 15 - 11 * 2);
-    uint32_t mid = lcg_rand() << (32 - 15 - 11 * 1);
-    uint32_t hi = lcg_rand() << (32 - 15 - 11 * 0);
+    uint32_t lo = prng_rand() >> -(32 - 15 - 11 * 2);
+    uint32_t mid = prng_rand() << (32 - 15 - 11 * 1);
+    uint32_t hi = prng_rand() << (32 - 15 - 11 * 0);
 
     return (hi ^ mid ^ lo);
 }