[PATCH i-g-t v4 4/7] Introduce common frame dumping configuration and helpers

[Paul Kocialkowski <paul.kocialkowski@linux.intel.com>]

This introduces a common FrameDumpPath configuration field, as well as
helper functions in dedicated igt_frame for writing cairo surfaces
to png files.

Signed-off-by: Paul Kocialkowski <paul.kocialkowski@linux.intel.com>
---
 lib/Makefile.sources |   2 +
 lib/igt.h            |   1 +
 lib/igt_core.c       |  12 +++++
 lib/igt_core.h       |   2 +-
 lib/igt_frame.c      | 137 +++++++++++++++++++++++++++++++++++++++++++++++++++
 lib/igt_frame.h      |  43 ++++++++++++++++
 6 files changed, 196 insertions(+), 1 deletion(-)
 create mode 100644 lib/igt_frame.c
 create mode 100644 lib/igt_frame.h

diff --git a/lib/Makefile.sources b/lib/Makefile.sources
index 53fdb54c..c2e58809 100644
--- a/lib/Makefile.sources
+++ b/lib/Makefile.sources
@@ -83,6 +83,8 @@ lib_source_list =	 	\
 	uwildmat/uwildmat.c	\
 	igt_kmod.c		\
 	igt_kmod.h		\
+	igt_frame.c		\
+	igt_frame.h		\
 	$(NULL)
 
 .PHONY: version.h.tmp
diff --git a/lib/igt.h b/lib/igt.h
index a069deb3..d16a4991 100644
--- a/lib/igt.h
+++ b/lib/igt.h
@@ -34,6 +34,7 @@
 #include "igt_draw.h"
 #include "igt_dummyload.h"
 #include "igt_fb.h"
+#include "igt_frame.h"
 #include "igt_gt.h"
 #include "igt_kms.h"
 #include "igt_pm.h"
diff --git a/lib/igt_core.c b/lib/igt_core.c
index 1ba79361..5a3b00e8 100644
--- a/lib/igt_core.c
+++ b/lib/igt_core.c
@@ -235,6 +235,10 @@
  * An example configuration follows:
  *
  * |[<!-- language="plain" -->
+ *	# The common configuration secton follows.
+ *	[Common]
+ *	FrameDumpPath=/tmp # The path to dump frames that fail comparison checks
+ *
  *	# The following section is used for configuring the Device Under Test.
  *	# It is not mandatory and allows overriding default values.
  *	[DUT]
@@ -290,6 +294,7 @@ static struct {
 static pthread_mutex_t log_buffer_mutex = PTHREAD_MUTEX_INITIALIZER;
 
 GKeyFile *igt_key_file;
+char *frame_dump_path;
 
 const char *igt_test_name(void)
 {
@@ -621,6 +626,13 @@ static int config_parse(void)
 	if (!igt_key_file)
 		return 0;
 
+	frame_dump_path = getenv("IGT_FRAME_DUMP_PATH");
+
+	if (!frame_dump_path)
+		frame_dump_path = g_key_file_get_string(igt_key_file, "Common",
+							"FrameDumpPath",
+							&error);
+
 	rc = g_key_file_get_integer(igt_key_file, "DUT", "SuspendResumeDelay",
 				    &error);
 	if (error && error->code == G_KEY_FILE_ERROR_INVALID_VALUE)
diff --git a/lib/igt_core.h b/lib/igt_core.h
index 0739ca83..1619a9d6 100644
--- a/lib/igt_core.h
+++ b/lib/igt_core.h
@@ -50,7 +50,7 @@
 extern const char* __igt_test_description __attribute__((weak));
 extern bool __igt_plain_output;
 extern GKeyFile *igt_key_file;
-
+extern char *frame_dump_path;
 
 /**
  * IGT_TEST_DESCRIPTION:
diff --git a/lib/igt_frame.c b/lib/igt_frame.c
new file mode 100644
index 00000000..dfafe53d
--- /dev/null
+++ b/lib/igt_frame.c
@@ -0,0 +1,137 @@
+/*
+ * Copyright © 2017 Intel Corporation
+ *
+ * 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.
+ *
+ * Authors:
+ *  Paul Kocialkowski <paul.kocialkowski@linux.intel.com>
+ */
+
+#include "config.h"
+
+#include <fcntl.h>
+#include <pixman.h>
+#include <cairo.h>
+
+#include "igt.h"
+
+/**
+ * SECTION:igt_frame
+ * @short_description: Library for frame-related tests
+ * @title: Frame
+ * @include: igt_frame.h
+ *
+ * This library contains helpers for frame-related tests. This includes common
+ * frame dumping as well as frame comparison helpers.
+ */
+
+/**
+ * igt_frame_dump_is_enabled:
+ *
+ * Get whether frame dumping is enabled.
+ *
+ * Returns: A boolean indicating whether frame dumping is enabled
+ */
+bool igt_frame_dump_is_enabled(void)
+{
+	return frame_dump_path != NULL;
+}
+
+static void igt_write_frame_to_png(cairo_surface_t *surface, int fd,
+				   const char *qualifier, const char *suffix)
+{
+	char path[PATH_MAX];
+	const char *test_name;
+	const char *subtest_name;
+	cairo_status_t status;
+	int index;
+
+	test_name = igt_test_name();
+	subtest_name = igt_subtest_name();
+
+	if (suffix)
+		snprintf(path, PATH_MAX, "%s/frame-%s-%s-%s-%s.png",
+			 frame_dump_path, test_name, subtest_name, qualifier,
+			 suffix);
+	else
+		snprintf(path, PATH_MAX, "%s/frame-%s-%s-%s.png",
+			 frame_dump_path, test_name, subtest_name, qualifier);
+
+	igt_debug("Dumping %s frame to %s...\n", qualifier, path);
+
+	status = cairo_surface_write_to_png(surface, path);
+
+	igt_assert_eq(status, CAIRO_STATUS_SUCCESS);
+
+	index = strlen(path);
+
+	if (fd >= 0 && index < (PATH_MAX - 1)) {
+		path[index++] = '\n';
+		path[index] = '\0';
+
+		write(fd, path, strlen(path));
+	}
+}
+
+/**
+ * igt_write_compared_frames_to_png:
+ * @reference: The reference cairo surface
+ * @capture: The captured cairo surface
+ * @reference_suffix: The suffix to give to the reference png file
+ * @capture_suffix: The suffix to give to the capture png file
+ *
+ * Write previously compared frames to png files.
+ */
+void igt_write_compared_frames_to_png(cairo_surface_t *reference,
+				      cairo_surface_t *capture,
+				      const char *reference_suffix,
+				      const char *capture_suffix)
+{
+	char *id;
+	const char *test_name;
+	const char *subtest_name;
+	char path[PATH_MAX];
+	int fd = -1;
+
+	if (!igt_frame_dump_is_enabled())
+		return;
+
+	id = getenv("IGT_FRAME_DUMP_ID");
+
+	test_name = igt_test_name();
+	subtest_name = igt_subtest_name();
+
+	if (id)
+		snprintf(path, PATH_MAX, "%s/frame-%s-%s-%s.txt",
+			 frame_dump_path, test_name, subtest_name, id);
+	else
+		snprintf(path, PATH_MAX, "%s/frame-%s-%s.txt",
+			 frame_dump_path, test_name, subtest_name);
+
+	fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
+	igt_assert(fd >= 0);
+
+	igt_debug("Writing dump report to %s...\n", path);
+
+	igt_write_frame_to_png(reference, fd, "reference", reference_suffix);
+	igt_write_frame_to_png(capture, fd, "capture", capture_suffix);
+
+	close(fd);
+}
diff --git a/lib/igt_frame.h b/lib/igt_frame.h
new file mode 100644
index 00000000..ec6a1643
--- /dev/null
+++ b/lib/igt_frame.h
@@ -0,0 +1,43 @@
+/*
+ * Copyright © 2017 Intel Corporation
+ *
+ * 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.
+ *
+ * Authors:
+ *  Paul Kocialkowski <paul.kocialkowski@linux.intel.com>
+ */
+
+#ifndef IGT_FRAME_H
+#define IGT_FRAME_H
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "igt.h"
+#include <stdbool.h>
+
+bool igt_frame_dump_is_enabled(void);
+void igt_write_compared_frames_to_png(cairo_surface_t *reference,
+				      cairo_surface_t *capture,
+				      const char *reference_suffix,
+				      const char *capture_suffix);
+
+#endif
-- 
2.13.2

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