test: Add new pixel-test regression test

This test program contains a table of individual operator/pixel
combinations. For each pixel combination, images of various sizes are
filled with the pixels and then composited. The result is then
verified against the output of do_composite(). If the result doesn't
match, detailed error information is printed.

The initial 14 pixel combinations currently all fail.

2 files changed, 268 insertions, 0 deletions

diff --git a/test/Makefile.sources b/test/Makefile.sources
index 9d0bd0fe..5b30970b 100644
--- a/test/Makefile.sources
+++ b/test/Makefile.sources
@@ -6,6 +6,7 @@ TESTPROGRAMS =			\
 	region-test		\
 	region-translate-test	\
 	combiner-test		\
+	pixel-test		\
 	fetch-test		\
 	rotate-test		\
 	oob-test		\
diff --git a/test/pixel-test.c b/test/pixel-test.c
new file mode 100644
index 00000000..8c525d20
--- /dev/null
+++ b/test/pixel-test.c
@@ -0,0 +1,267 @@
+/*
+ * Copyright © 2013 Soeren Sandmann
+ * Copyright © 2013 Red Hat, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+#include <stdio.h>
+#include <stdlib.h> /* abort() */
+#include <math.h>
+#include <time.h>
+#include "utils.h"
+
+typedef struct pixel_combination_t pixel_combination_t;
+struct pixel_combination_t
+{
+    pixman_op_t			op;
+    pixman_format_code_t	src_format;
+    uint32_t			src_pixel;
+    pixman_format_code_t	dest_format;
+    uint32_t			dest_pixel;
+};
+
+static const pixel_combination_t regressions[] =
+{
+    { PIXMAN_OP_OVER,
+      PIXMAN_a8r8g8b8,	0x0f00c300,
+      PIXMAN_x14r6g6b6,	0x003c0,
+    },
+    { PIXMAN_OP_DISJOINT_XOR,
+      PIXMAN_a4r4g4b4,	0xd0c0,
+      PIXMAN_a8r8g8b8,	0x5300ea00,
+    },
+    { PIXMAN_OP_OVER,
+      PIXMAN_a8r8g8b8,	0x20c6bf00,
+      PIXMAN_r5g6b5,	0xb9ff
+    },
+    { PIXMAN_OP_OVER,
+      PIXMAN_a8r8g8b8,	0x204ac7ff,
+      PIXMAN_r5g6b5,	0xc1ff
+    },
+    { PIXMAN_OP_OVER_REVERSE,
+      PIXMAN_r5g6b5,	0xffc3,
+      PIXMAN_a8r8g8b8,	0x102d00dd
+    },
+    { PIXMAN_OP_OVER_REVERSE,
+      PIXMAN_r5g6b5,	0x1f00,
+      PIXMAN_a8r8g8b8,	0x1bdf0c89
+    },
+    { PIXMAN_OP_OVER_REVERSE,
+      PIXMAN_r5g6b5,	0xf9d2,
+      PIXMAN_a8r8g8b8,	0x1076bcf7
+    },
+    { PIXMAN_OP_OVER_REVERSE,
+      PIXMAN_r5g6b5,	0x00c3,
+      PIXMAN_a8r8g8b8,	0x1bfe9ae5
+    },
+    { PIXMAN_OP_OVER_REVERSE,
+      PIXMAN_r5g6b5,	0x09ff,
+      PIXMAN_a8r8g8b8,	0x0b00c16c
+    },
+    { PIXMAN_OP_DISJOINT_ATOP,
+      PIXMAN_a2r2g2b2,	0xbc,
+      PIXMAN_a8r8g8b8,	0x9efff1ff
+    },
+    { PIXMAN_OP_DISJOINT_ATOP,
+      PIXMAN_a4r4g4b4,	0xae5f,
+      PIXMAN_a8r8g8b8,	0xf215b675
+    },
+    { PIXMAN_OP_DISJOINT_ATOP_REVERSE,
+      PIXMAN_a8r8g8b8,	0xce007980,
+      PIXMAN_a8r8g8b8,	0x80ffe4ad
+    },
+    { PIXMAN_OP_DISJOINT_XOR,
+      PIXMAN_a8r8g8b8,	0xb8b07bea,
+      PIXMAN_a4r4g4b4,	0x939c
+    },
+    { PIXMAN_OP_CONJOINT_ATOP_REVERSE,
+      PIXMAN_r5g6b5,	0x0063,
+      PIXMAN_a8r8g8b8,	0x10bb1ed7,
+    },
+};
+
+static void
+fill (pixman_image_t *image, uint32_t pixel)
+{
+    uint8_t *data = (uint8_t *)pixman_image_get_data (image);
+    int bytes_per_pixel = PIXMAN_FORMAT_BPP (pixman_image_get_format (image)) / 8;
+    int n_bytes = pixman_image_get_stride (image) * pixman_image_get_height (image);
+    int i;
+
+    switch (bytes_per_pixel)
+    {
+    case 4:
+	for (i = 0; i < n_bytes / 4; ++i)
+	    ((uint32_t *)data)[i] = pixel;
+	break;
+
+    case 2:
+	pixel &= 0xffff;
+	for (i = 0; i < n_bytes / 2; ++i)
+	    ((uint16_t *)data)[i] = pixel;
+	break;
+
+    case 1:
+	pixel &= 0xff;
+	for (i = 0; i < n_bytes; ++i)
+	    ((uint8_t *)data)[i] = pixel;
+	break;
+
+    default:
+	assert (0);
+	break;
+    }
+}
+
+static uint32_t
+access (pixman_image_t *image, int x, int y)
+{
+    int bytes_per_pixel;
+    int stride;
+    uint32_t result;
+    uint8_t *location;
+
+    if (x < 0 || x >= image->bits.width || y < 0 || y >= image->bits.height)
+        return 0;
+
+    bytes_per_pixel = PIXMAN_FORMAT_BPP (image->bits.format) / 8;
+    stride = image->bits.rowstride * 4;
+
+    location = (uint8_t *)image->bits.bits + y * stride + x * bytes_per_pixel;
+
+    if (bytes_per_pixel == 4)
+        result = *(uint32_t *)location;
+    else if (bytes_per_pixel == 2)
+        result = *(uint16_t *)location;
+    else if (bytes_per_pixel == 1)
+        result = *(uint8_t *)location;
+    else
+	assert (0);
+
+    return result;
+}
+
+static pixman_bool_t
+verify (int test_no, const pixel_combination_t *combination, int size)
+{
+    pixman_image_t *src, *dest;
+    pixel_checker_t src_checker, dest_checker;
+    color_t source_color, dest_color, reference_color;
+    pixman_bool_t result = TRUE;
+    int i, j;
+
+    /* Compute reference color */
+    pixel_checker_init (&src_checker, combination->src_format);
+    pixel_checker_init (&dest_checker, combination->dest_format);
+    pixel_checker_convert_pixel_to_color (
+	&src_checker, combination->src_pixel, &source_color);
+    pixel_checker_convert_pixel_to_color (
+	&dest_checker, combination->dest_pixel, &dest_color);
+    do_composite (combination->op,
+		  &source_color, NULL, &dest_color,
+		  &reference_color, FALSE);
+
+    src = pixman_image_create_bits (
+	combination->src_format, size, size, NULL, -1);
+    dest = pixman_image_create_bits (
+	combination->dest_format, size, size, NULL, -1);
+
+    fill (src, combination->src_pixel);
+    fill (dest, combination->dest_pixel);
+
+    pixman_image_composite32 (
+	combination->op, src, NULL, dest, 0, 0, 0, 0, 0, 0, size, size);
+
+    for (j = 0; j < size; ++j)
+    {
+	for (i = 0; i < size; ++i)
+	{
+	    uint32_t computed = access (dest, i, j);
+	    int32_t a, r, g, b;
+
+	    if (!pixel_checker_check (&dest_checker, computed, &reference_color))
+	    {
+		printf ("----------- Test %d failed ----------\n", test_no);
+
+		printf ("   operator:         %s\n", operator_name (combination->op));
+		printf ("   src format:       %s\n", format_name (combination->src_format));
+		printf ("   dest format:      %s\n", format_name (combination->dest_format));
+                printf (" - source ARGB:      %f  %f  %f  %f   (pixel: %8x)\n",
+                        source_color.a, source_color.r, source_color.g, source_color.b,
+                        combination->src_pixel);
+		pixel_checker_split_pixel (&src_checker, combination->src_pixel,
+					   &a, &r, &g, &b);
+                printf ("                     %8d  %8d  %8d  %8d\n", a, r, g, b);
+
+                printf (" - dest ARGB:        %f  %f  %f  %f   (pixel: %8x)\n",
+                        dest_color.a, dest_color.r, dest_color.g, dest_color.b,
+                        combination->dest_pixel);
+		pixel_checker_split_pixel (&dest_checker, combination->dest_pixel,
+					   &a, &r, &g, &b);
+                printf ("                     %8d  %8d  %8d  %8d\n", a, r, g, b);
+
+                pixel_checker_split_pixel (&dest_checker, computed, &a, &r, &g, &b);
+                printf (" - expected ARGB:    %f  %f  %f  %f\n",
+                        reference_color.a, reference_color.r, reference_color.g, reference_color.b);
+
+                pixel_checker_get_min (&dest_checker, &reference_color, &a, &r, &g, &b);
+                printf ("   min acceptable:   %8d  %8d  %8d  %8d\n", a, r, g, b);
+
+                pixel_checker_split_pixel (&dest_checker, computed, &a, &r, &g, &b);
+                printf ("   got:              %8d  %8d  %8d  %8d   (pixel: %8x)\n", a, r, g, b, computed);
+
+                pixel_checker_get_max (&dest_checker, &reference_color, &a, &r, &g, &b);
+                printf ("   max acceptable:   %8d  %8d  %8d  %8d\n", a, r, g, b);
+
+		result = FALSE;
+		goto done;
+	    }
+	}
+    }
+
+done:
+    pixman_image_unref (src);
+    pixman_image_unref (dest);
+
+    return result;
+}
+
+int
+main (int argc, char **argv)
+{
+    int result = 0;
+    int i, j;
+
+    for (i = 0; i < ARRAY_LENGTH (regressions); ++i)
+    {
+	const pixel_combination_t *combination = &(regressions[i]);
+
+	for (j = 1; j < 34; ++j)
+	{
+	    if (!verify (i, combination, j))
+	    {
+		result = 1;
+		break;
+	    }
+	}
+    }
+
+    return result;
+}