[RFC v4 07/22] lib/igt_fb: Add copy_fb function

[Bhanuprakash Modem <bhanuprakash.modem@intel.com>]

From: Harry Wentland <harry.wentland@amd.com>

Signed-off-by: Harry Wentland <harry.wentland@amd.com>
---
 lib/igt_fb.c | 34 ++++++++++++++++++++++++++++++++++
 lib/igt_fb.h |  1 +
 2 files changed, 35 insertions(+)

diff --git a/lib/igt_fb.c b/lib/igt_fb.c
index ee9cd1f35..13e9c29b1 100644
--- a/lib/igt_fb.c
+++ b/lib/igt_fb.c
@@ -2154,6 +2154,40 @@ unsigned int igt_create_fb(int fd, int width, int height, uint32_t format,
 					  fb, 0, 0);
 }
 
+unsigned int igt_copy_fb(int fd, struct igt_fb *src, struct igt_fb *fb)
+{
+	char *in_ptr, *out_ptr;
+	int cpp = igt_drm_format_to_bpp(src->drm_format) / 8;
+
+	int fb_id = 0;
+	igt_assert(src);
+
+	/* TODO allow multiple planes */
+	if (src->num_planes != 1)
+		return -EINVAL;
+
+	/* TODO expand for other formats */
+	if (src->drm_format != DRM_FORMAT_XRGB8888)
+		return -EINVAL;
+
+	fb_id = igt_create_fb(fd, src->width, src->height, src->drm_format,
+			    src->modifier, fb);
+
+	/* copy buffer contents */
+	/* TODO simplify :D */
+	in_ptr = igt_fb_map_buffer(fb->fd, src);
+	igt_assert(in_ptr);
+	out_ptr = igt_fb_map_buffer(fb->fd, fb);
+	igt_assert(out_ptr);
+
+	igt_memcpy_from_wc(out_ptr, in_ptr, fb->width * fb->height * cpp);
+
+	igt_fb_unmap_buffer(fb, out_ptr);
+	igt_fb_unmap_buffer(src, in_ptr);
+
+	return fb_id;
+}
+
 /**
  * igt_create_color_fb:
  * @fd: open drm file descriptor
diff --git a/lib/igt_fb.h b/lib/igt_fb.h
index d2751c0bb..258a7669e 100644
--- a/lib/igt_fb.h
+++ b/lib/igt_fb.h
@@ -142,6 +142,7 @@ struct intel_buf *igt_fb_create_intel_buf(int fd, struct buf_ops *bops,
 					  const struct igt_fb *fb, const char *name);
 unsigned int igt_create_fb(int fd, int width, int height, uint32_t format,
 			   uint64_t modifier, struct igt_fb *fb);
+unsigned int igt_copy_fb(int fd, struct igt_fb *src, struct igt_fb *fb);
 unsigned int igt_create_color_fb(int fd, int width, int height,
 				 uint32_t format, uint64_t modifier,
 				 double r, double g, double b,
-- 
2.43.0