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([213.94.25.69]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3823a0e8f26sm7119834f8f.31.2024.11.18.09.10.46 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 18 Nov 2024 09:10:47 -0800 (PST) From: =?UTF-8?q?Jos=C3=A9=20Exp=C3=B3sito?= To: louis.chauvet@bootlin.com Cc: airlied@gmail.com, arthurgrillo@riseup.net, corbet@lwn.net, dri-devel@lists.freedesktop.org, hamohammed.sa@gmail.com, helen.koike@collabora.com, jeremie.dautheribes@bootlin.com, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, maarten.lankhorst@linux.intel.com, mairacanal@riseup.net, marcheu@google.com, melissa.srw@gmail.com, miquel.raynal@bootlin.com, mripard@kernel.org, nicolejadeyee@google.com, pekka.paalanen@haloniitty.fi, rdunlap@infradead.org, rodrigosiqueiramelo@gmail.com, seanpaul@google.com, simona.vetter@ffwll.ch, simona@ffwll.ch, thomas.petazzoni@bootlin.com, tzimmermann@suse.de Subject: [PATCH v13 7/9] drm/vkms: Introduce pixel_read_direction enum Date: Mon, 18 Nov 2024 18:10:45 +0100 Message-ID: <20241118171046.2861-1-jose.exposito89@gmail.com> X-Mailer: git-send-email 2.47.0 In-Reply-To: <20241031-yuv-v13-7-bd5463126faa@bootlin.com> References: <20241031-yuv-v13-7-bd5463126faa@bootlin.com> Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit > The pixel_read_direction enum is useful to describe the reading direction > in a plane. It avoids using the rotation property of DRM, which not > practical to know the direction of reading. > This patch also introduce two helpers, one to compute the > pixel_read_direction from the DRM rotation property, and one to compute > the step, in byte, between two successive pixel in a specific direction. > > Acked-by: Maíra Canal > Signed-off-by: Louis Chauvet > --- > drivers/gpu/drm/vkms/vkms_composer.c | 44 ++++++++++++++++++++++++++++++++++++ > drivers/gpu/drm/vkms/vkms_drv.h | 11 +++++++++ > drivers/gpu/drm/vkms/vkms_formats.c | 32 ++++++++++++++++++++++++++ > 3 files changed, 87 insertions(+) > > diff --git a/drivers/gpu/drm/vkms/vkms_composer.c b/drivers/gpu/drm/vkms/vkms_composer.c > index ecac0bc858a0..601e33431b45 100644 > --- a/drivers/gpu/drm/vkms/vkms_composer.c > +++ b/drivers/gpu/drm/vkms/vkms_composer.c > @@ -159,6 +159,50 @@ static void apply_lut(const struct vkms_crtc_state *crtc_state, struct line_buff > } > } > > +/** > + * direction_for_rotation() - Get the correct reading direction for a given rotation > + * > + * @rotation: Rotation to analyze. It correspond the field @frame_info.rotation. > + * > + * This function will use the @rotation setting of a source plane to compute the reading > + * direction in this plane which correspond to a "left to right writing" in the CRTC. > + * For example, if the buffer is reflected on X axis, the pixel must be read from right to left > + * to be written from left to right on the CRTC. > + */ > +static enum pixel_read_direction direction_for_rotation(unsigned int rotation) > +{ > + struct drm_rect tmp_a, tmp_b; > + int x, y; > + > + /* > + * Points A and B are depicted as zero-size rectangles on the CRTC. > + * The CRTC writing direction is from A to B. The plane reading direction > + * is discovered by inverse-transforming A and B. > + * The reading direction is computed by rotating the vector AB (top-left to top-right) in a > + * 1x1 square. > + */ > + > + tmp_a = DRM_RECT_INIT(0, 0, 0, 0); > + tmp_b = DRM_RECT_INIT(1, 0, 0, 0); > + drm_rect_rotate_inv(&tmp_a, 1, 1, rotation); > + drm_rect_rotate_inv(&tmp_b, 1, 1, rotation); > + > + x = tmp_b.x1 - tmp_a.x1; > + y = tmp_b.y1 - tmp_a.y1; > + > + if (x == 1 && y == 0) > + return READ_LEFT_TO_RIGHT; > + else if (x == -1 && y == 0) > + return READ_RIGHT_TO_LEFT; > + else if (y == 1 && x == 0) > + return READ_TOP_TO_BOTTOM; > + else if (y == -1 && x == 0) > + return READ_BOTTOM_TO_TOP; > + > + WARN_ONCE(true, "The inverse of the rotation gives an incorrect direction."); > + return READ_LEFT_TO_RIGHT; > +} > + > /** > * blend - blend the pixels from all planes and compute crc > * @wb: The writeback frame buffer metadata > diff --git a/drivers/gpu/drm/vkms/vkms_drv.h b/drivers/gpu/drm/vkms/vkms_drv.h > index 3f45290a0c5d..777b7bd91f27 100644 > --- a/drivers/gpu/drm/vkms/vkms_drv.h > +++ b/drivers/gpu/drm/vkms/vkms_drv.h > @@ -69,6 +69,17 @@ struct vkms_writeback_job { > pixel_write_t pixel_write; > }; > > +/** > + * enum pixel_read_direction - Enum used internaly by VKMS to represent a reading direction in a Minor typo: s/internaly/internally Everything else looks great, thanks! > + * plane. > + */ > +enum pixel_read_direction { > + READ_BOTTOM_TO_TOP, > + READ_TOP_TO_BOTTOM, > + READ_RIGHT_TO_LEFT, > + READ_LEFT_TO_RIGHT > +}; > + > /** > * typedef pixel_read_t - These functions are used to read a pixel in the source frame, > * convert it to `struct pixel_argb_u16` and write it to @out_pixel. > diff --git a/drivers/gpu/drm/vkms/vkms_formats.c b/drivers/gpu/drm/vkms/vkms_formats.c > index 7f932d42394d..d0e7dfc1f0d3 100644 > --- a/drivers/gpu/drm/vkms/vkms_formats.c > +++ b/drivers/gpu/drm/vkms/vkms_formats.c > @@ -79,6 +79,38 @@ static void packed_pixels_addr(const struct vkms_frame_info *frame_info, > *addr = (u8 *)frame_info->map[0].vaddr + offset; > } > > +/** > + * get_block_step_bytes() - Common helper to compute the correct step value between each pixel block > + * to read in a certain direction. > + * > + * @fb: Framebuffer to iter on > + * @direction: Direction of the reading > + * @plane_index: Plane to get the step from > + * > + * As the returned count is the number of bytes between two consecutive blocks in a direction, > + * the caller may have to read multiple pixels before using the next one (for example, to read from > + * left to right in a DRM_FORMAT_R1 plane, each block contains 8 pixels, so the step must be used > + * only every 8 pixels). > + */ > +static int get_block_step_bytes(struct drm_framebuffer *fb, enum pixel_read_direction direction, > + int plane_index) > +{ > + switch (direction) { > + case READ_LEFT_TO_RIGHT: > + return fb->format->char_per_block[plane_index]; > + case READ_RIGHT_TO_LEFT: > + return -fb->format->char_per_block[plane_index]; > + case READ_TOP_TO_BOTTOM: > + return (int)fb->pitches[plane_index] * drm_format_info_block_width(fb->format, > + plane_index); > + case READ_BOTTOM_TO_TOP: > + return -(int)fb->pitches[plane_index] * drm_format_info_block_width(fb->format, > + plane_index); > + } > + > + return 0; > +} > + > /** > * packed_pixels_addr_1x1() - Get the pointer to the block containing the pixel at the given > * coordinates >