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From: ville.syrjala@linux.intel.com
To: dri-devel@lists.freedesktop.org
Subject: [PATCH 3/4] drm: Add drm_format_{horz, vert}_chroma_subsampling() utility functions
Date: Thu,  5 Apr 2012 21:35:17 +0300	[thread overview]
Message-ID: <1333650918-16919-3-git-send-email-ville.syrjala@linux.intel.com> (raw)
In-Reply-To: <1333650918-16919-1-git-send-email-ville.syrjala@linux.intel.com>

From: Ville Syrjälä <ville.syrjala@linux.intel.com>

These functions return the chroma subsampling factors for the specified
pixel format.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
---
 drivers/gpu/drm/drm_crtc.c |   60 ++++++++++++++++++++++++++++++++++++++++++++
 include/drm/drm_crtc.h     |    2 +
 2 files changed, 62 insertions(+), 0 deletions(-)

diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index 74979ae..95f15c8 100644
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -3531,3 +3531,63 @@ int drm_format_plane_cpp(uint32_t format, int plane)
 	}
 }
 EXPORT_SYMBOL(drm_format_plane_cpp);
+
+/**
+ * drm_format_horz_chroma_subsampling - get the horizontal chroma subsampling factor
+ * @format: pixel format (DRM_FORMAT_*)
+ *
+ * RETURNS:
+ * The horizontal chroma subsampling factor for the
+ * specified pixel format.
+ */
+int drm_format_horz_chroma_subsampling(uint32_t format)
+{
+	switch (format) {
+	case DRM_FORMAT_YUV411:
+	case DRM_FORMAT_YVU411:
+	case DRM_FORMAT_YUV410:
+	case DRM_FORMAT_YVU410:
+		return 4;
+	case DRM_FORMAT_YUYV:
+	case DRM_FORMAT_YVYU:
+	case DRM_FORMAT_UYVY:
+	case DRM_FORMAT_VYUY:
+	case DRM_FORMAT_NV12:
+	case DRM_FORMAT_NV21:
+	case DRM_FORMAT_NV16:
+	case DRM_FORMAT_NV61:
+	case DRM_FORMAT_YUV422:
+	case DRM_FORMAT_YVU422:
+	case DRM_FORMAT_YUV420:
+	case DRM_FORMAT_YVU420:
+		return 2;
+	default:
+		return 1;
+	}
+}
+EXPORT_SYMBOL(drm_format_horz_chroma_subsampling);
+
+/**
+ * drm_format_vert_chroma_subsampling - get the vertical chroma subsampling factor
+ * @format: pixel format (DRM_FORMAT_*)
+ *
+ * RETURNS:
+ * The vertical chroma subsampling factor for the
+ * specified pixel format.
+ */
+int drm_format_vert_chroma_subsampling(uint32_t format)
+{
+	switch (format) {
+	case DRM_FORMAT_YUV410:
+	case DRM_FORMAT_YVU410:
+		return 4;
+	case DRM_FORMAT_YUV420:
+	case DRM_FORMAT_YVU420:
+	case DRM_FORMAT_NV12:
+	case DRM_FORMAT_NV21:
+		return 2;
+	default:
+		return 1;
+	}
+}
+EXPORT_SYMBOL(drm_format_vert_chroma_subsampling);
diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
index ae7be55..824ab09 100644
--- a/include/drm/drm_crtc.h
+++ b/include/drm/drm_crtc.h
@@ -1025,5 +1025,7 @@ extern void drm_fb_get_bpp_depth(uint32_t format, unsigned int *depth,
 				 int *bpp);
 extern int drm_format_num_planes(uint32_t format);
 extern int drm_format_plane_cpp(uint32_t format, int plane);
+extern int drm_format_horz_chroma_subsampling(uint32_t format);
+extern int drm_format_vert_chroma_subsampling(uint32_t format);
 
 #endif /* __DRM_CRTC_H__ */
-- 
1.7.3.4

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  parent reply	other threads:[~2012-04-05 18:35 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-04-05 18:35 [PATCH 1/4] drm: Move drm_format_num_planes() to drm_crtc.c ville.syrjala
2012-04-05 18:35 ` [PATCH 2/4] drm: Add drm_format_plane_cpp() utility function ville.syrjala
2012-04-05 18:35 ` ville.syrjala [this message]
2012-04-11 18:53   ` [PATCH 3/4] drm: Add drm_format_{horz, vert}_chroma_subsampling() utility functions Roland Scheidegger
2012-04-12 12:23     ` Ville Syrjälä
2012-04-13  2:42       ` Roland Scheidegger
2012-04-13 12:09         ` Ville Syrjälä
2012-04-05 18:35 ` [PATCH 4/4] drm: Add sanity checks to framebuffer creation ville.syrjala
2012-04-20 11:43 ` [PATCH 1/4] drm: Move drm_format_num_planes() to drm_crtc.c Dave Airlie
2012-04-20 12:23   ` Ville Syrjälä
2012-04-20 12:29     ` Dave Airlie
2012-04-20 12:48       ` Rob Clark
2012-04-20 13:49         ` Ville Syrjälä
2012-04-20 14:22           ` Rob Clark
2012-04-21  4:00             ` InKi Dae

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