| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-Id: <20240304-yuv-v4-7-76beac8e9793@bootlin.com>
Date: Mon, 04 Mar 2024 16:28:12 +0100
From: Louis Chauvet <louis.chauvet@...tlin.com>
To: Rodrigo Siqueira <rodrigosiqueiramelo@...il.com>,
Melissa Wen <melissa.srw@...il.com>,
Maíra Canal <mairacanal@...eup.net>,
Haneen Mohammed <hamohammed.sa@...il.com>, Daniel Vetter <daniel@...ll.ch>,
Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>,
David Airlie <airlied@...il.com>, arthurgrillo@...eup.net,
Jonathan Corbet <corbet@....net>, pekka.paalanen@...oniitty.fi
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
jeremie.dautheribes@...tlin.com, miquel.raynal@...tlin.com,
thomas.petazzoni@...tlin.com, seanpaul@...gle.com, marcheu@...gle.com,
nicolejadeyee@...gle.com, Louis Chauvet <louis.chauvet@...tlin.com>
Subject: [PATCH v4 07/14] drm/vkms: Update pixels accessor to support
packed and multi-plane formats.
Introduce the usage of block_h/block_w to compute the offset and the
pointer of a pixel. The previous implementation was specialized for
planes with block_h == block_w == 1. To avoid confusion and allow easier
implementation of tiled formats. It also remove the usage of the
deprecated format field `cpp`.
Introduce the plane_index parameter to get an offset/pointer on a
different plane.
Signed-off-by: Louis Chauvet <louis.chauvet@...tlin.com>
---
drivers/gpu/drm/vkms/vkms_formats.c | 59 +++++++++++++++++++++----------------
1 file changed, 34 insertions(+), 25 deletions(-)
diff --git a/drivers/gpu/drm/vkms/vkms_formats.c b/drivers/gpu/drm/vkms/vkms_formats.c
index bdd15964ce24..089e4bdd5da8 100644
--- a/drivers/gpu/drm/vkms/vkms_formats.c
+++ b/drivers/gpu/drm/vkms/vkms_formats.c
@@ -10,23 +10,33 @@
#include "vkms_formats.h"
/**
- * pixel_offset() - Get the offset of the pixel at coordinates x/y in the first plane
+ * packed_pixels_offset() - Get the offset of the block containing the pixel at coordinates x/y
*
* @frame_info: Buffer metadata
* @x: The x coordinate of the wanted pixel in the buffer
* @y: The y coordinate of the wanted pixel in the buffer
+ * @plane_index: The index of the plane to use
*
- * The caller must ensure that the framebuffer associated with this request uses a pixel format
- * where block_h == block_w == 1.
- * If this requirement is not fulfilled, the resulting offset can point to an other pixel or
- * outside of the buffer.
+ * The returned offset correspond to the offset of the block containing the pixel at coordinates
+ * x/y.
+ * The caller must use this offset with care, as for formats with block_h != 1 or block_w != 1
+ * the requested pixel value may have to be extracted from the block, even if they are
+ * individually addressable.
*/
-static size_t pixel_offset(const struct vkms_frame_info *frame_info, int x, int y)
+static size_t packed_pixels_offset(const struct vkms_frame_info *frame_info, int x, int y,
+ size_t plane_index)
{
struct drm_framebuffer *fb = frame_info->fb;
-
- return fb->offsets[0] + (y * fb->pitches[0])
- + (x * fb->format->cpp[0]);
+ const struct drm_format_info *format = frame_info->fb->format;
+ /* Directly using x and y to multiply pitches and format->ccp is not sufficient because
+ * in some formats a block can represent multiple pixels.
+ *
+ * Dividing x and y by the block size allows to extract the correct offset of the block
+ * containing the pixel.
+ */
+ return fb->offsets[plane_index] +
+ (y / drm_format_info_block_width(format, plane_index)) * fb->pitches[plane_index] +
+ (x / drm_format_info_block_height(format, plane_index)) * format->char_per_block[plane_index];
}
/**
@@ -36,30 +46,29 @@ static size_t pixel_offset(const struct vkms_frame_info *frame_info, int x, int
* @frame_info: Buffer metadata
* @x: The x(width) coordinate inside the plane
* @y: The y(height) coordinate inside the plane
+ * @plane_index: The index of the plane
*
- * Takes the information stored in the frame_info, a pair of coordinates, and
- * returns the address of the first color channel.
- * This function assumes the channels are packed together, i.e. a color channel
- * comes immediately after another in the memory. And therefore, this function
- * doesn't work for YUV with chroma subsampling (e.g. YUV420 and NV21).
+ * Takes the information stored in the frame_info, a pair of coordinates, and returns the address
+ * of the block containing this pixel.
*
- * The caller must ensure that the framebuffer associated with this request uses a pixel format
- * where block_h == block_w == 1, otherwise the returned pointer can be outside the buffer.
+ * The returned pointer points to the block containing the pixel at coordinates x/y.
+ * The caller must use this pointer with care, as for formats with block_h != 1 or block_w != 1
+ * the requested pixel may have to be extracted from the block, even if they are
+ * individually addressable.
*/
static void *packed_pixels_addr(const struct vkms_frame_info *frame_info,
- int x, int y)
+ int x, int y, size_t plane_index)
{
- size_t offset = pixel_offset(frame_info, x, y);
-
- return (u8 *)frame_info->map[0].vaddr + offset;
+ return (u8 *)frame_info->map[0].vaddr + packed_pixels_offset(frame_info, x, y, plane_index);
}
-static void *get_packed_src_addr(const struct vkms_frame_info *frame_info, int y)
+static void *get_packed_src_addr(const struct vkms_frame_info *frame_info, int y,
+ size_t plane_index)
{
int x_src = frame_info->src.x1 >> 16;
int y_src = y - frame_info->rotated.y1 + (frame_info->src.y1 >> 16);
- return packed_pixels_addr(frame_info, x_src, y_src);
+ return packed_pixels_addr(frame_info, x_src, y_src, plane_index);
}
static int get_x_position(const struct vkms_frame_info *frame_info, int limit, int x)
@@ -168,14 +177,14 @@ void vkms_compose_row(struct line_buffer *stage_buffer, struct vkms_plane_state
{
struct pixel_argb_u16 *out_pixels = stage_buffer->pixels;
struct vkms_frame_info *frame_info = plane->frame_info;
- u8 *src_pixels = get_packed_src_addr(frame_info, y);
+ u8 *src_pixels = get_packed_src_addr(frame_info, y, 0);
int limit = min_t(size_t, drm_rect_width(&frame_info->dst), stage_buffer->n_pixels);
for (size_t x = 0; x < limit; x++, src_pixels += frame_info->fb->format->cpp[0]) {
int x_pos = get_x_position(frame_info, limit, x);
if (drm_rotation_90_or_270(frame_info->rotation))
- src_pixels = get_packed_src_addr(frame_info, x + frame_info->rotated.y1)
+ src_pixels = get_packed_src_addr(frame_info, x + frame_info->rotated.y1, 0)
+ frame_info->fb->format->cpp[0] * y;
plane->pixel_read(src_pixels, &out_pixels[x_pos]);
@@ -275,7 +284,7 @@ void vkms_writeback_row(struct vkms_writeback_job *wb,
{
struct vkms_frame_info *frame_info = &wb->wb_frame_info;
int x_dst = frame_info->dst.x1;
- u8 *dst_pixels = packed_pixels_addr(frame_info, x_dst, y);
+ u8 *dst_pixels = packed_pixels_addr(frame_info, x_dst, y, 0);
struct pixel_argb_u16 *in_pixels = src_buffer->pixels;
int x_limit = min_t(size_t, drm_rect_width(&frame_info->dst), src_buffer->n_pixels);
--
2.43.0
Powered by blists - more mailing lists