[RFC PATCH v2 04/11] lib/igt_fb: Add YUV color pattern framebuffer support

[Harry Wentland <harry.wentland@amd.com>]

Add igt_create_color_pattern_fb_yuv() function to create test pattern
framebuffers in YUV formats. This extends the existing color pattern
functionality to support YUV testing, handling proper conversion from
RGB test patterns to YUV color spaces with correct encoding and range.

Assisted-by: Claude:claude-sonnet-4-5
Signed-off-by: Harry Wentland <harry.wentland@amd.com>
---
 lib/igt_fb.c | 41 +++++++++++++++++++++++++++++++++++++++++
 lib/igt_fb.h |  6 ++++++
 2 files changed, 47 insertions(+)

diff --git a/lib/igt_fb.c b/lib/igt_fb.c
index d59fe133b320..b7d94bf192ef 100644
--- a/lib/igt_fb.c
+++ b/lib/igt_fb.c
@@ -2367,6 +2367,47 @@ unsigned int igt_create_color_pattern_fb(int fd, int width, int height,
 	return fb_id;
 }
 
+/**
+ * igt_create_color_pattern_fb_yuv:
+ * @fd: open drm file descriptor
+ * @width: width of the framebuffer in pixel
+ * @height: height of the framebuffer in pixel
+ * @format: drm fourcc pixel format code
+ * @modifier: tiling layout of the framebuffer
+ * @color_encoding: color encoding for YUV formats (e.g., BT.601, BT.709, BT.2020)
+ * @color_range: color range for YUV formats (limited or full range)
+ * @r: red value to use as background, 0.0 for black, 1.0 for red
+ * @g: green value to use as background, 0.0 for black, 1.0 for green
+ * @b: blue value to use as background, 0.0 for black, 1.0 for blue
+ * @fb: pointer to an #igt_fb structure
+ *
+ * This creates a framebuffer for YUV formats with the specified color encoding
+ * and range. Cairo is used to draw the background color and test pattern, with
+ * automatic RGB to YUV conversion based on the specified encoding and range.
+ *
+ * Returns:
+ * The kms id of the created framebuffer on success or a negative error code on
+ * failure.
+ */
+unsigned int igt_create_color_pattern_fb_yuv(int fd, int width, int height,
+					     uint32_t format, uint64_t modifier,
+					     enum igt_color_encoding color_encoding,
+					     enum igt_color_range color_range,
+					     double r, double g, double b,
+					     struct igt_fb *fb /* out */)
+{
+	unsigned int fb_id;
+
+	fb_id = igt_create_fb_with_bo_size(fd, width, height, format, modifier,
+					   color_encoding, color_range,
+					   fb, 0, 0);
+	igt_assert(fb_id);
+
+	igt_paint_test_pattern_color_fb(fd, fb, r, g, b);
+
+	return fb_id;
+}
+
 /**
  * igt_create_image_fb:
  * @drm_fd: open drm file descriptor
diff --git a/lib/igt_fb.h b/lib/igt_fb.h
index 8e5907dabed4..213e2d77795d 100644
--- a/lib/igt_fb.h
+++ b/lib/igt_fb.h
@@ -153,6 +153,12 @@ unsigned int igt_create_color_pattern_fb(int fd, int width, int height,
 					 uint32_t format, uint64_t modifier,
 					 double r, double g, double b,
 					 struct igt_fb *fb /* out */);
+unsigned int igt_create_color_pattern_fb_yuv(int fd, int width, int height,
+					     uint32_t format, uint64_t modifier,
+					     enum igt_color_encoding color_encoding,
+					     enum igt_color_range color_range,
+					     double r, double g, double b,
+					     struct igt_fb *fb /* out */);
 unsigned int igt_create_image_fb(int drm_fd,  int width, int height,
 				 uint32_t format, uint64_t modifier,
 				 const char *filename,
-- 
2.53.0