[PATCH i-g-t v2 3/4] lib/igt_chamelium: Add support for dumping chamelium frames to a png

[Paul Kocialkowski <paul.kocialkowski@xxxxxxxxxxxxxxx>]

This introduces a chamelium_write_frame_to_png function that saves a
Chamelium frame dump to a png file. This should be useful when a frame
comparison with a reference fails.
---
 lib/igt_chamelium.c | 32 ++++++++++++++++++++++++++++++++
 lib/igt_chamelium.h |  3 +++
 2 files changed, 35 insertions(+)

diff --git a/lib/igt_chamelium.c b/lib/igt_chamelium.c
index b9d80b6b..c8719f4d 100644
--- a/lib/igt_chamelium.c
+++ b/lib/igt_chamelium.c
@@ -978,6 +978,38 @@ void chamelium_assert_frame_eq(const struct chamelium *chamelium,
 		      "Chamelium frame dump didn't match reference image\n");
 }
 
+void chamelium_write_frame_to_png(const struct chamelium *chamelium,
+				  const struct chamelium_frame_dump *dump,
+				  const char *filename)
+{
+	cairo_surface_t *dump_surface;
+	pixman_image_t *image_bgr;
+	pixman_image_t *image_argb;
+	int w = dump->width, h = dump->height;
+	uint32_t *bits_bgr = (uint32_t *) dump->bgr;
+	unsigned char *bits_argb;
+	cairo_status_t status;
+
+	image_bgr = pixman_image_create_bits(
+	    PIXMAN_b8g8r8, w, h, bits_bgr,
+	    PIXMAN_FORMAT_BPP(PIXMAN_b8g8r8) / 8 * w);
+	image_argb = convert_frame_format(image_bgr, PIXMAN_x8r8g8b8);
+	pixman_image_unref(image_bgr);
+
+	bits_argb = (unsigned char *) pixman_image_get_data(image_argb);
+
+	dump_surface = cairo_image_surface_create_for_data(
+	    bits_argb, CAIRO_FORMAT_ARGB32, w, h,
+	    PIXMAN_FORMAT_BPP(PIXMAN_x8r8g8b8) / 8 * w);
+
+	status = cairo_surface_write_to_png(dump_surface, filename);
+	cairo_surface_destroy(dump_surface);
+
+	pixman_image_unref(image_argb);
+
+	igt_assert(status == CAIRO_STATUS_SUCCESS);
+}
+
 /**
  * chamelium_get_frame_limit:
  * @chamelium: The Chamelium instance to use
diff --git a/lib/igt_chamelium.h b/lib/igt_chamelium.h
index e51cf4f9..908e03d1 100644
--- a/lib/igt_chamelium.h
+++ b/lib/igt_chamelium.h
@@ -105,6 +105,9 @@ int chamelium_get_frame_limit(struct chamelium *chamelium,
 void chamelium_assert_frame_eq(const struct chamelium *chamelium,
 			       const struct chamelium_frame_dump *dump,
 			       struct igt_fb *fb);
+void chamelium_write_frame_to_png(const struct chamelium *chamelium,
+				  const struct chamelium_frame_dump *dump,
+				  const char *filename);
 void chamelium_destroy_frame_dump(struct chamelium_frame_dump *dump);
 
 #endif /* IGT_CHAMELIUM_H */
-- 
2.13.2

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