test/scaling-test.c - third_party/pixman - Git at Google

 /*
  * Test program, which can detect some problems with nearest neighbour
  * and bilinear scaling in pixman. Testing is done by running lots
  * of random SRC and OVER compositing operations a8r8g8b8, x8a8r8g8b8
  * and r5g6b5 color formats.
  *
  * Script 'fuzzer-find-diff.pl' can be used to narrow down the problem in
  * the case of test failure.
  */
 #include <stdlib.h>
 #include <stdio.h>
 #include "utils.h"

 #define MAX_SRC_WIDTH  48
 #define MAX_SRC_HEIGHT 8
 #define MAX_DST_WIDTH  48
 #define MAX_DST_HEIGHT 8
 #define MAX_STRIDE     4

 /*
  * Composite operation with pseudorandom images
  */

 static pixman_format_code_t
 get_format (int bpp)
 {
     if (bpp == 4)
     {
 	switch (prng_rand_n (4))
 	{
 	default:
 	case 0:
 	    return PIXMAN_a8r8g8b8;
 	case 1:
 	    return PIXMAN_x8r8g8b8;
 	case 2:
 	    return PIXMAN_a8b8g8r8;
 	case 3:
 	    return PIXMAN_x8b8g8r8;
 	}
     }
     else
     {
 	return PIXMAN_r5g6b5;
     }
 }

 uint32_t
 test_composite (int      testnum,
 		int      verbose)
 {
     int                i;
     pixman_image_t *   src_img;
     pixman_image_t *   mask_img;
     pixman_image_t *   dst_img;
     pixman_transform_t transform;
     pixman_region16_t  clip;
     int                src_width, src_height;
     int                mask_width, mask_height;
     int                dst_width, dst_height;
     int                src_stride, mask_stride, dst_stride;
     int                src_x, src_y;
     int                mask_x, mask_y;
     int                dst_x, dst_y;
     int                src_bpp;
     int                mask_bpp = 1;
     int                dst_bpp;
     int                w, h;
     pixman_fixed_t     scale_x = 65536, scale_y = 65536;
     pixman_fixed_t     translate_x = 0, translate_y = 0;
     pixman_fixed_t     mask_scale_x = 65536, mask_scale_y = 65536;
     pixman_fixed_t     mask_translate_x = 0, mask_translate_y = 0;
     pixman_op_t        op;
     pixman_repeat_t    repeat = PIXMAN_REPEAT_NONE;
     pixman_repeat_t    mask_repeat = PIXMAN_REPEAT_NONE;
     pixman_format_code_t src_fmt, mask_fmt, dst_fmt;
     uint32_t *         srcbuf;
     uint32_t *         dstbuf;
     uint32_t *         maskbuf;
     uint32_t           crc32;
     FLOAT_REGS_CORRUPTION_DETECTOR_START ();

     prng_srand (testnum);

     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;
 	break;
     case 1:
 	op = PIXMAN_OP_OVER;
 	break;
     default:
 	op = PIXMAN_OP_ADD;
 	break;
     }

     src_width = prng_rand_n (MAX_SRC_WIDTH) + 1;
     src_height = prng_rand_n (MAX_SRC_HEIGHT) + 1;

     if (prng_rand_n (2))
     {
 	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 = 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;

     if (mask_stride & 1)
 	mask_stride += 1;
     if (mask_stride & 2)
 	mask_stride += 2;

     if (dst_stride & 3)
 	dst_stride += 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);
     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);

     prng_randmemset (srcbuf, src_stride * src_height, 0);
     prng_randmemset (maskbuf, mask_stride * mask_height, 0);
     prng_randmemset (dstbuf, dst_stride * dst_height, 0);

     src_fmt = get_format (src_bpp);
     mask_fmt = PIXMAN_a8;
     dst_fmt = get_format (dst_bpp);

     if (prng_rand_n (2))
     {
 	srcbuf += (src_stride / 4) * (src_height - 1);
 	src_stride = - src_stride;
     }

     if (prng_rand_n (2))
     {
 	maskbuf += (mask_stride / 4) * (mask_height - 1);
 	mask_stride = - mask_stride;
     }

     if (prng_rand_n (2))
     {
 	dstbuf += (dst_stride / 4) * (dst_height - 1);
 	dst_stride = - dst_stride;
     }

     src_img = pixman_image_create_bits (
         src_fmt, src_width, src_height, srcbuf, src_stride);

     mask_img = pixman_image_create_bits (
         mask_fmt, mask_width, mask_height, maskbuf, mask_stride);

     dst_img = pixman_image_create_bits (
         dst_fmt, dst_width, dst_height, dstbuf, dst_stride);

     image_endian_swap (src_img);
     image_endian_swap (dst_img);

     if (prng_rand_n (4) > 0)
     {
 	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 (prng_rand_n (2) > 0)
     {
 	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 (prng_rand_n (4))
     {
     case 0:
 	mask_repeat = PIXMAN_REPEAT_NONE;
 	break;

     case 1:
 	mask_repeat = PIXMAN_REPEAT_NORMAL;
 	break;

     case 2:
 	mask_repeat = PIXMAN_REPEAT_PAD;
 	break;

     case 3:
 	mask_repeat = PIXMAN_REPEAT_REFLECT;
 	break;

     default:
         break;
     }
     pixman_image_set_repeat (mask_img, mask_repeat);

     switch (prng_rand_n (4))
     {
     case 0:
 	repeat = PIXMAN_REPEAT_NONE;
 	break;

     case 1:
 	repeat = PIXMAN_REPEAT_NORMAL;
 	break;

     case 2:
 	repeat = PIXMAN_REPEAT_PAD;
 	break;

     case 3:
 	repeat = PIXMAN_REPEAT_REFLECT;
 	break;

     default:
         break;
     }
     pixman_image_set_repeat (src_img, repeat);

     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 (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);

     if (prng_rand_n (8) == 0)
     {
 	pixman_box16_t clip_boxes[2];
 	int            n = prng_rand_n (2) + 1;

 	for (i = 0; i < n; i++)
 	{
 	    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 + prng_rand_n (src_width - clip_boxes[i].x1);
 	    clip_boxes[i].y2 =
 		clip_boxes[i].y1 + prng_rand_n (src_height - clip_boxes[i].y1);

 	    if (verbose)
 	    {
 		printf ("source clip box: [%d,%d-%d,%d]\n",
 		        clip_boxes[i].x1, clip_boxes[i].y1,
 		        clip_boxes[i].x2, clip_boxes[i].y2);
 	    }
 	}

 	pixman_region_init_rects (&clip, clip_boxes, n);
 	pixman_image_set_clip_region (src_img, &clip);
 	pixman_image_set_source_clipping (src_img, 1);
 	pixman_region_fini (&clip);
     }

     if (prng_rand_n (8) == 0)
     {
 	pixman_box16_t clip_boxes[2];
 	int            n = prng_rand_n (2) + 1;

 	for (i = 0; i < n; i++)
 	{
 	    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 + prng_rand_n (mask_width - clip_boxes[i].x1);
 	    clip_boxes[i].y2 =
 		clip_boxes[i].y1 + prng_rand_n (mask_height - clip_boxes[i].y1);

 	    if (verbose)
 	    {
 		printf ("mask clip box: [%d,%d-%d,%d]\n",
 		        clip_boxes[i].x1, clip_boxes[i].y1,
 		        clip_boxes[i].x2, clip_boxes[i].y2);
 	    }
 	}

 	pixman_region_init_rects (&clip, clip_boxes, n);
 	pixman_image_set_clip_region (mask_img, &clip);
 	pixman_image_set_source_clipping (mask_img, 1);
 	pixman_region_fini (&clip);
     }

     if (prng_rand_n (8) == 0)
     {
 	pixman_box16_t clip_boxes[2];
 	int            n = prng_rand_n (2) + 1;
 	for (i = 0; i < n; i++)
 	{
 	    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 + prng_rand_n (dst_width - clip_boxes[i].x1);
 	    clip_boxes[i].y2 =
 		clip_boxes[i].y1 + prng_rand_n (dst_height - clip_boxes[i].y1);

 	    if (verbose)
 	    {
 		printf ("destination clip box: [%d,%d-%d,%d]\n",
 		        clip_boxes[i].x1, clip_boxes[i].y1,
 		        clip_boxes[i].x2, clip_boxes[i].y2);
 	    }
 	}
 	pixman_region_init_rects (&clip, clip_boxes, n);
 	pixman_image_set_clip_region (dst_img, &clip);
 	pixman_region_fini (&clip);
     }

     if (prng_rand_n (2) == 0)
     {
 	mask_fmt = PIXMAN_null;
 	pixman_image_unref (mask_img);
 	mask_img = NULL;
 	mask_x = 0;
 	mask_y = 0;
     }

     if (verbose)
     {
 	printf ("op=%s, src_fmt=%s, mask_fmt=%s, dst_fmt=%s\n",
 	        operator_name (op), format_name (src_fmt),
 	        format_name (mask_fmt), format_name (dst_fmt));
 	printf ("scale_x=%d, scale_y=%d, repeat=%d, filter=%d\n",
 	        scale_x, scale_y, repeat, src_img->common.filter);
 	printf ("translate_x=%d, translate_y=%d\n",
 	        translate_x, translate_y);
 	if (mask_fmt != PIXMAN_null)
 	{
 	    printf ("mask_scale_x=%d, mask_scale_y=%d, "
 	            "mask_repeat=%d, mask_filter=%d\n",
 	            mask_scale_x, mask_scale_y, mask_repeat,
 	            mask_img->common.filter);
 	    printf ("mask_translate_x=%d, mask_translate_y=%d\n",
 	            mask_translate_x, mask_translate_y);
 	}
 	printf ("src_width=%d, src_height=%d, src_x=%d, src_y=%d\n",
 	        src_width, src_height, src_x, src_y);
 	if (mask_fmt != PIXMAN_null)
 	{
 	    printf ("mask_width=%d, mask_height=%d, mask_x=%d, mask_y=%d\n",
 	            mask_width, mask_height, mask_x, mask_y);
 	}
 	printf ("dst_width=%d, dst_height=%d, dst_x=%d, dst_y=%d\n",
 	        dst_width, dst_height, dst_x, dst_y);
 	printf ("w=%d, h=%d\n", w, h);
     }

     pixman_image_composite (op, src_img, mask_img, dst_img,
                             src_x, src_y, mask_x, mask_y, dst_x, dst_y, w, h);

     crc32 = compute_crc32_for_image (0, dst_img);

     if (verbose)
 	print_image (dst_img);

     pixman_image_unref (src_img);
     if (mask_img != NULL)
 	pixman_image_unref (mask_img);
     pixman_image_unref (dst_img);

     if (src_stride < 0)
 	srcbuf += (src_stride / 4) * (src_height - 1);

     if (mask_stride < 0)
 	maskbuf += (mask_stride / 4) * (mask_height - 1);

     if (dst_stride < 0)
 	dstbuf += (dst_stride / 4) * (dst_height - 1);

     free (srcbuf);
     free (maskbuf);
     free (dstbuf);

     FLOAT_REGS_CORRUPTION_DETECTOR_FINISH ();
     return crc32;
 }

 #if BILINEAR_INTERPOLATION_BITS == 7
 #define CHECKSUM 0x92E0F068
 #elif BILINEAR_INTERPOLATION_BITS == 4
 #define CHECKSUM 0x8EFFA1E5
 #else
 #define CHECKSUM 0x00000000
 #endif

 int
 main (int argc, const char *argv[])
 {
     pixman_disable_out_of_bounds_workaround ();

     return fuzzer_test_main("scaling", 8000000, CHECKSUM,
 			    test_composite, argc, argv);
 }
	/*
	* Test program, which can detect some problems with nearest neighbour
	* and bilinear scaling in pixman. Testing is done by running lots
	* of random SRC and OVER compositing operations a8r8g8b8, x8a8r8g8b8
	* and r5g6b5 color formats.
	*
	* Script 'fuzzer-find-diff.pl' can be used to narrow down the problem in
	* the case of test failure.
	*/
	#include <stdlib.h>
	#include <stdio.h>
	#include "utils.h"

	#define MAX_SRC_WIDTH 48
	#define MAX_SRC_HEIGHT 8
	#define MAX_DST_WIDTH 48
	#define MAX_DST_HEIGHT 8
	#define MAX_STRIDE 4

	/*
	* Composite operation with pseudorandom images
	*/

	static pixman_format_code_t
	get_format (int bpp)
	{
	if (bpp == 4)
	{
	switch (prng_rand_n (4))
	{
	default:
	case 0:
	return PIXMAN_a8r8g8b8;
	case 1:
	return PIXMAN_x8r8g8b8;
	case 2:
	return PIXMAN_a8b8g8r8;
	case 3:
	return PIXMAN_x8b8g8r8;
	}
	}
	else
	{
	return PIXMAN_r5g6b5;
	}
	}

	uint32_t
	test_composite (int testnum,
	int verbose)
	{
	int i;
	pixman_image_t * src_img;
	pixman_image_t * mask_img;
	pixman_image_t * dst_img;
	pixman_transform_t transform;
	pixman_region16_t clip;
	int src_width, src_height;
	int mask_width, mask_height;
	int dst_width, dst_height;
	int src_stride, mask_stride, dst_stride;
	int src_x, src_y;
	int mask_x, mask_y;
	int dst_x, dst_y;
	int src_bpp;
	int mask_bpp = 1;
	int dst_bpp;
	int w, h;
	pixman_fixed_t scale_x = 65536, scale_y = 65536;
	pixman_fixed_t translate_x = 0, translate_y = 0;
	pixman_fixed_t mask_scale_x = 65536, mask_scale_y = 65536;
	pixman_fixed_t mask_translate_x = 0, mask_translate_y = 0;
	pixman_op_t op;
	pixman_repeat_t repeat = PIXMAN_REPEAT_NONE;
	pixman_repeat_t mask_repeat = PIXMAN_REPEAT_NONE;
	pixman_format_code_t src_fmt, mask_fmt, dst_fmt;
	uint32_t * srcbuf;
	uint32_t * dstbuf;
	uint32_t * maskbuf;
	uint32_t crc32;
	FLOAT_REGS_CORRUPTION_DETECTOR_START ();

	prng_srand (testnum);

	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;
	break;
	case 1:
	op = PIXMAN_OP_OVER;
	break;
	default:
	op = PIXMAN_OP_ADD;
	break;
	}

	src_width = prng_rand_n (MAX_SRC_WIDTH) + 1;
	src_height = prng_rand_n (MAX_SRC_HEIGHT) + 1;

	if (prng_rand_n (2))
	{
	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 = 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;

	if (mask_stride & 1)
	mask_stride += 1;
	if (mask_stride & 2)
	mask_stride += 2;

	if (dst_stride & 3)
	dst_stride += 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);
	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);

	prng_randmemset (srcbuf, src_stride * src_height, 0);
	prng_randmemset (maskbuf, mask_stride * mask_height, 0);
	prng_randmemset (dstbuf, dst_stride * dst_height, 0);

	src_fmt = get_format (src_bpp);
	mask_fmt = PIXMAN_a8;
	dst_fmt = get_format (dst_bpp);

	if (prng_rand_n (2))
	{
	srcbuf += (src_stride / 4) * (src_height - 1);
	src_stride = - src_stride;
	}

	if (prng_rand_n (2))
	{
	maskbuf += (mask_stride / 4) * (mask_height - 1);
	mask_stride = - mask_stride;
	}

	if (prng_rand_n (2))
	{
	dstbuf += (dst_stride / 4) * (dst_height - 1);
	dst_stride = - dst_stride;
	}

	src_img = pixman_image_create_bits (
	src_fmt, src_width, src_height, srcbuf, src_stride);

	mask_img = pixman_image_create_bits (
	mask_fmt, mask_width, mask_height, maskbuf, mask_stride);

	dst_img = pixman_image_create_bits (
	dst_fmt, dst_width, dst_height, dstbuf, dst_stride);

	image_endian_swap (src_img);
	image_endian_swap (dst_img);

	if (prng_rand_n (4) > 0)
	{
	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 (prng_rand_n (2) > 0)
	{
	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 (prng_rand_n (4))
	{
	case 0:
	mask_repeat = PIXMAN_REPEAT_NONE;
	break;

	case 1:
	mask_repeat = PIXMAN_REPEAT_NORMAL;
	break;

	case 2:
	mask_repeat = PIXMAN_REPEAT_PAD;
	break;

	case 3:
	mask_repeat = PIXMAN_REPEAT_REFLECT;
	break;

	default:
	break;
	}
	pixman_image_set_repeat (mask_img, mask_repeat);

	switch (prng_rand_n (4))
	{
	case 0:
	repeat = PIXMAN_REPEAT_NONE;
	break;

	case 1:
	repeat = PIXMAN_REPEAT_NORMAL;
	break;

	case 2:
	repeat = PIXMAN_REPEAT_PAD;
	break;

	case 3:
	repeat = PIXMAN_REPEAT_REFLECT;
	break;

	default:
	break;
	}
	pixman_image_set_repeat (src_img, repeat);

	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 (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);

	if (prng_rand_n (8) == 0)
	{
	pixman_box16_t clip_boxes[2];
	int n = prng_rand_n (2) + 1;

	for (i = 0; i < n; i++)
	{
	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 + prng_rand_n (src_width - clip_boxes[i].x1);
	clip_boxes[i].y2 =
	clip_boxes[i].y1 + prng_rand_n (src_height - clip_boxes[i].y1);

	if (verbose)
	{
	printf ("source clip box: [%d,%d-%d,%d]\n",
	clip_boxes[i].x1, clip_boxes[i].y1,
	clip_boxes[i].x2, clip_boxes[i].y2);
	}
	}

	pixman_region_init_rects (&clip, clip_boxes, n);
	pixman_image_set_clip_region (src_img, &clip);
	pixman_image_set_source_clipping (src_img, 1);
	pixman_region_fini (&clip);
	}

	if (prng_rand_n (8) == 0)
	{
	pixman_box16_t clip_boxes[2];
	int n = prng_rand_n (2) + 1;

	for (i = 0; i < n; i++)
	{
	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 + prng_rand_n (mask_width - clip_boxes[i].x1);
	clip_boxes[i].y2 =
	clip_boxes[i].y1 + prng_rand_n (mask_height - clip_boxes[i].y1);

	if (verbose)
	{
	printf ("mask clip box: [%d,%d-%d,%d]\n",
	clip_boxes[i].x1, clip_boxes[i].y1,
	clip_boxes[i].x2, clip_boxes[i].y2);
	}
	}

	pixman_region_init_rects (&clip, clip_boxes, n);
	pixman_image_set_clip_region (mask_img, &clip);
	pixman_image_set_source_clipping (mask_img, 1);
	pixman_region_fini (&clip);
	}

	if (prng_rand_n (8) == 0)
	{
	pixman_box16_t clip_boxes[2];
	int n = prng_rand_n (2) + 1;
	for (i = 0; i < n; i++)
	{
	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 + prng_rand_n (dst_width - clip_boxes[i].x1);
	clip_boxes[i].y2 =
	clip_boxes[i].y1 + prng_rand_n (dst_height - clip_boxes[i].y1);

	if (verbose)
	{
	printf ("destination clip box: [%d,%d-%d,%d]\n",
	clip_boxes[i].x1, clip_boxes[i].y1,
	clip_boxes[i].x2, clip_boxes[i].y2);
	}
	}
	pixman_region_init_rects (&clip, clip_boxes, n);
	pixman_image_set_clip_region (dst_img, &clip);
	pixman_region_fini (&clip);
	}

	if (prng_rand_n (2) == 0)
	{
	mask_fmt = PIXMAN_null;
	pixman_image_unref (mask_img);
	mask_img = NULL;
	mask_x = 0;
	mask_y = 0;
	}

	if (verbose)
	{
	printf ("op=%s, src_fmt=%s, mask_fmt=%s, dst_fmt=%s\n",
	operator_name (op), format_name (src_fmt),
	format_name (mask_fmt), format_name (dst_fmt));
	printf ("scale_x=%d, scale_y=%d, repeat=%d, filter=%d\n",
	scale_x, scale_y, repeat, src_img->common.filter);
	printf ("translate_x=%d, translate_y=%d\n",
	translate_x, translate_y);
	if (mask_fmt != PIXMAN_null)
	{
	printf ("mask_scale_x=%d, mask_scale_y=%d, "
	"mask_repeat=%d, mask_filter=%d\n",
	mask_scale_x, mask_scale_y, mask_repeat,
	mask_img->common.filter);
	printf ("mask_translate_x=%d, mask_translate_y=%d\n",
	mask_translate_x, mask_translate_y);
	}
	printf ("src_width=%d, src_height=%d, src_x=%d, src_y=%d\n",
	src_width, src_height, src_x, src_y);
	if (mask_fmt != PIXMAN_null)
	{
	printf ("mask_width=%d, mask_height=%d, mask_x=%d, mask_y=%d\n",
	mask_width, mask_height, mask_x, mask_y);
	}
	printf ("dst_width=%d, dst_height=%d, dst_x=%d, dst_y=%d\n",
	dst_width, dst_height, dst_x, dst_y);
	printf ("w=%d, h=%d\n", w, h);
	}

	pixman_image_composite (op, src_img, mask_img, dst_img,
	src_x, src_y, mask_x, mask_y, dst_x, dst_y, w, h);

	crc32 = compute_crc32_for_image (0, dst_img);

	if (verbose)
	print_image (dst_img);

	pixman_image_unref (src_img);
	if (mask_img != NULL)
	pixman_image_unref (mask_img);
	pixman_image_unref (dst_img);

	if (src_stride < 0)
	srcbuf += (src_stride / 4) * (src_height - 1);

	if (mask_stride < 0)
	maskbuf += (mask_stride / 4) * (mask_height - 1);

	if (dst_stride < 0)
	dstbuf += (dst_stride / 4) * (dst_height - 1);

	free (srcbuf);
	free (maskbuf);
	free (dstbuf);

	FLOAT_REGS_CORRUPTION_DETECTOR_FINISH ();
	return crc32;
	}

	#if BILINEAR_INTERPOLATION_BITS == 7
	#define CHECKSUM 0x92E0F068
	#elif BILINEAR_INTERPOLATION_BITS == 4
	#define CHECKSUM 0x8EFFA1E5
	#else
	#define CHECKSUM 0x00000000
	#endif

	int
	main (int argc, const char *argv[])
	{
	pixman_disable_out_of_bounds_workaround ();

	return fuzzer_test_main("scaling", 8000000, CHECKSUM,
	test_composite, argc, argv);
	}