From: Geert Uytterhoeven <geert@linux-m68k.org>
To: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
Maxime Ripard <mripard@kernel.org>,
Thomas Zimmermann <tzimmermann@suse.de>,
David Airlie <airlied@linux.ie>, Daniel Vetter <daniel@ffwll.ch>,
Javier Martinez Canillas <javierm@redhat.com>,
Sam Ravnborg <sam@ravnborg.org>, Helge Deller <deller@gmx.de>
Cc: dri-devel@lists.freedesktop.org, linux-fbdev@vger.kernel.org,
linux-m68k@vger.kernel.org, linux-kernel@vger.kernel.org,
Geert Uytterhoeven <geert@linux-m68k.org>
Subject: [PATCH v2 RFC 10/10] drm/fourcc: Add DRM_FORMAT_D[1248]
Date: Mon, 7 Mar 2022 21:52:45 +0100 [thread overview]
Message-ID: <e05254ba67598b3973010a7b6f31dd6b20a66844.1646683502.git.geert@linux-m68k.org> (raw)
In-Reply-To: <cover.1646683502.git.geert@linux-m68k.org>
As Rn is light-on-dark, and Cn can be any colors, there are currently
no fourcc codes to describe dark-on-light displays.
Introduce fourcc codes for a single-channel dark-on-light frame buffer
format with two, four, sixteen, or 256 darkness levels.
As the number of bits per pixel may be less than eight, some of these
formats rely on proper block handling for the calculation of bits per
pixel and pitch.
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
---
RFC, as I have no immediate need for these formats.
v2:
- Add rationale for adding new formats,
- Improve pixel descriptions,
- Add D[248] for completeness.
---
drivers/gpu/drm/drm_fourcc.c | 7 +++++++
include/uapi/drm/drm_fourcc.h | 12 ++++++++++++
2 files changed, 19 insertions(+)
diff --git a/drivers/gpu/drm/drm_fourcc.c b/drivers/gpu/drm/drm_fourcc.c
index 05e65e9ab0c69c6a..e09331bb3bc73f21 100644
--- a/drivers/gpu/drm/drm_fourcc.c
+++ b/drivers/gpu/drm/drm_fourcc.c
@@ -154,6 +154,13 @@ const struct drm_format_info *__drm_format_info(u32 format)
{ .format = DRM_FORMAT_C4, .depth = 4, .num_planes = 1,
.char_per_block = { 1, }, .block_w = { 2, }, .block_h = { 1, }, .hsub = 1, .vsub = 1, .is_color_indexed = true },
{ .format = DRM_FORMAT_C8, .depth = 8, .num_planes = 1, .cpp = { 1, 0, 0 }, .hsub = 1, .vsub = 1, .is_color_indexed = true },
+ { .format = DRM_FORMAT_D1, .depth = 1, .num_planes = 1,
+ .char_per_block = { 1, }, .block_w = { 8, }, .block_h = { 1, }, .hsub = 1, .vsub = 1 },
+ { .format = DRM_FORMAT_D2, .depth = 2, .num_planes = 1,
+ .char_per_block = { 1, }, .block_w = { 4, }, .block_h = { 1, }, .hsub = 1, .vsub = 1 },
+ { .format = DRM_FORMAT_D4, .depth = 4, .num_planes = 1,
+ .char_per_block = { 1, }, .block_w = { 2, }, .block_h = { 1, }, .hsub = 1, .vsub = 1 },
+ { .format = DRM_FORMAT_D8, .depth = 8, .num_planes = 1, .cpp = { 1, 0, 0 }, .hsub = 1, .vsub = 1 },
{ .format = DRM_FORMAT_R1, .depth = 1, .num_planes = 1,
.char_per_block = { 1, }, .block_w = { 8, }, .block_h = { 1, }, .hsub = 1, .vsub = 1 },
{ .format = DRM_FORMAT_R2, .depth = 2, .num_planes = 1,
diff --git a/include/uapi/drm/drm_fourcc.h b/include/uapi/drm/drm_fourcc.h
index def0a73620dc86d2..1d8d82b1742898c0 100644
--- a/include/uapi/drm/drm_fourcc.h
+++ b/include/uapi/drm/drm_fourcc.h
@@ -104,6 +104,18 @@ extern "C" {
#define DRM_FORMAT_C4 fourcc_code('C', '4', ' ', ' ') /* [7:0] C0:C1 4:4 two pixels/byte */
#define DRM_FORMAT_C8 fourcc_code('C', '8', ' ', ' ') /* [7:0] C 8 one pixel/byte */
+/* 1 bpp Darkness (monochrome dark-on-light) */
+#define DRM_FORMAT_D1 fourcc_code('D', '1', ' ', ' ') /* [7:0] D0:D1:D2:D3:D4:D5:D6:D7 1:1:1:1:1:1:1:1 eight pixels/byte */
+
+/* 2 bpp Darkness (generic dark-on-light) */
+#define DRM_FORMAT_D2 fourcc_code('D', '2', ' ', ' ') /* [7:0] D0:D1:D2:D3 2:2:2:2 four pixels/byte */
+
+/* 4 bpp Darkness (generic dark-on-light) */
+#define DRM_FORMAT_D4 fourcc_code('D', '4', ' ', ' ') /* [7:0] D0:D1 4:4 two pixels/byte */
+
+/* 8 bpp Darkness (generic dark-on-light) */
+#define DRM_FORMAT_D8 fourcc_code('D', '8', ' ', ' ') /* [7:0] D 8 one pixel/byte */
+
/* 1 bpp Red (or monochrome light-on-dark) */
#define DRM_FORMAT_R1 fourcc_code('R', '1', ' ', ' ') /* [7:0] R0:R1:R2:R3:R4:R5:R6:R7 1:1:1:1:1:1:1:1 eight pixels/byte */
--
2.25.1
next prev parent reply other threads:[~2022-03-07 20:54 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-07 20:52 [PATCH v2 00/10] drm: Add support for low-color frame buffer formats Geert Uytterhoeven
2022-03-07 20:52 ` [PATCH v2 01/10] drm/fourcc: Add drm_format_info_bpp() helper Geert Uytterhoeven
2022-03-09 12:46 ` Javier Martinez Canillas
2022-03-07 20:52 ` [PATCH v2 02/10] drm/fourcc: Add drm_format_info.is_color_indexed flag Geert Uytterhoeven
2022-03-09 12:50 ` Javier Martinez Canillas
2022-03-07 20:52 ` [PATCH v2 03/10] drm/client: Use actual bpp when allocating frame buffers Geert Uytterhoeven
2022-03-09 12:51 ` Javier Martinez Canillas
2022-03-07 20:52 ` [PATCH v2 04/10] drm/framebuffer: Use actual bpp for DRM_IOCTL_MODE_GETFB Geert Uytterhoeven
2022-03-09 12:53 ` Javier Martinez Canillas
2022-03-07 20:52 ` [PATCH v2 05/10] drm/fourcc: Add DRM_FORMAT_C[124] Geert Uytterhoeven
2022-03-08 9:04 ` Pekka Paalanen
2022-03-09 12:57 ` Javier Martinez Canillas
2022-03-14 13:30 ` Geert Uytterhoeven
2022-03-14 15:05 ` Pekka Paalanen
2022-03-14 19:01 ` Geert Uytterhoeven
2022-03-14 22:15 ` Finn Thain
2022-03-15 7:32 ` Pekka Paalanen
2022-03-15 7:51 ` Geert Uytterhoeven
2022-03-15 7:52 ` Geert Uytterhoeven
2022-03-15 8:45 ` Pekka Paalanen
2022-03-15 8:57 ` Geert Uytterhoeven
2022-03-15 10:48 ` Pekka Paalanen
2022-03-07 20:52 ` [PATCH v2 06/10] drm/fb-helper: Add support for DRM_FORMAT_C[124] Geert Uytterhoeven
2022-03-09 13:10 ` Javier Martinez Canillas
2022-03-09 13:14 ` Geert Uytterhoeven
2022-03-07 20:52 ` [PATCH v2 RFC 07/10] drm/gem-fb-helper: Use actual bpp for size calculations Geert Uytterhoeven
2022-03-09 13:16 ` Javier Martinez Canillas
2022-03-07 20:52 ` [PATCH v2 RFC 08/10] drm/fourcc: Document that single-channel "red" can be any color Geert Uytterhoeven
2022-03-08 9:06 ` Pekka Paalanen
2022-03-09 13:33 ` Javier Martinez Canillas
2022-03-07 20:52 ` [PATCH v2 RFC 09/10] drm/fourcc: Add DRM_FORMAT_R[124] Geert Uytterhoeven
2022-03-09 13:39 ` Javier Martinez Canillas
2022-03-07 20:52 ` Geert Uytterhoeven [this message]
2022-03-09 13:41 ` [PATCH v2 RFC 10/10] drm/fourcc: Add DRM_FORMAT_D[1248] Javier Martinez Canillas
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