From nobody Mon Feb 9 09:38:34 2026 Received: from relay1-d.mail.gandi.net (relay1-d.mail.gandi.net [217.70.183.193]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 00D5C130487 for ; Tue, 9 Apr 2024 13:25:53 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.70.183.193 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712669156; cv=none; b=HbhqDKITABkBIeI1SHgq9TkLXUS2ctGg8eEaWG6bC90qtmufZVXU07BLemnuPnAHlmCaeP2YFvI7Nv4B3ZZjcVm23bqnNOj9OHfhac+JLjONgUiqft/bSR3E64ojgGvwH69qa/21elx0gQN+Seigrzwwvvx7GZvXcfO/XXOAGxk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712669156; c=relaxed/simple; bh=yADtRXVKW9eJ+FMWpWTJbC0RyEvP6Fm0YKwrRfIPJKE=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=G29wK0kbqdIZiP4v8a6nG0HjLeSOaTE1tjY0havbMWlu/IeUGpUOiholy+ctng6sZT4+SsHPCCiiEklEje4ogCDxIxpdOhwetMfydfoUci0Ccm7er3KqejH4nUL9FvwHtqDt35PMz/hVnSzGg58j1TkYrTbtNsYEowNYu7xEc4o= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=bootlin.com; spf=pass smtp.mailfrom=bootlin.com; dkim=pass (2048-bit key) header.d=bootlin.com header.i=@bootlin.com header.b=iHAeqj2C; arc=none smtp.client-ip=217.70.183.193 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=bootlin.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=bootlin.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=bootlin.com header.i=@bootlin.com header.b="iHAeqj2C" Received: by mail.gandi.net (Postfix) with ESMTPSA id 7CACF240014; Tue, 9 Apr 2024 13:25:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1712669152; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=3J4b+nj6kf4aWQDjptbnmcHrG88ny05nRttOGw9gTdw=; b=iHAeqj2CiXCHWrZny388uKfqM7Rm3R6r0mQIdTwCuWEkSYDJBNJWWnczMez4yTrTqMuUkG 5wUiBLiiT27liOpbfs2lak0nIuE1Ewm/blagCMgttbzgzvcNo31mD5kntIMF8Sx5a/Cmj+ 5BaVHsoeFQ/crANSEeM6EzNduaoq1T39xPczCi4SIYCyalZzO9PNpqy3lskTbe2ChdkYSM M/4ldWr5Ym50OIpQmSo7GbNy/TrHv+CTB7mu5BIwOenpTPkYK2znE0A4TU1jlqoSc2ECHH S7Mlohc8nKzin6z2KgV1lHsVMhBvPFobCjgKzg+MZrx6ELRjLLXmAV5NFIul8w== From: Louis Chauvet Date: Tue, 09 Apr 2024 15:25:26 +0200 Subject: [PATCH v6 08/17] drm/vkms: Avoid computing blending limits inside pre_mul_alpha_blend Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20240409-yuv-v6-8-de1c5728fd70@bootlin.com> References: <20240409-yuv-v6-0-de1c5728fd70@bootlin.com> In-Reply-To: <20240409-yuv-v6-0-de1c5728fd70@bootlin.com> To: Rodrigo Siqueira , Melissa Wen , =?utf-8?q?Ma=C3=ADra_Canal?= , Haneen Mohammed , Daniel Vetter , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , rdunlap@infradead.org, arthurgrillo@riseup.net, Jonathan Corbet , pekka.paalanen@haloniitty.fi Cc: dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, jeremie.dautheribes@bootlin.com, miquel.raynal@bootlin.com, thomas.petazzoni@bootlin.com, seanpaul@google.com, marcheu@google.com, nicolejadeyee@google.com, Louis Chauvet X-Mailer: b4 0.14-dev X-Developer-Signature: v=1; a=openpgp-sha256; l=4015; i=louis.chauvet@bootlin.com; h=from:subject:message-id; bh=yADtRXVKW9eJ+FMWpWTJbC0RyEvP6Fm0YKwrRfIPJKE=; b=owEBbQKS/ZANAwAIASCtLsZbECziAcsmYgBmFUHSZUQ6kMwtbBmuo01Nc0Xr4jVnXV+2t8Whm wMWDpaQRqCJAjMEAAEIAB0WIQRPj7g/vng8MQxQWQQgrS7GWxAs4gUCZhVB0gAKCRAgrS7GWxAs 4lylEAC3AIZ9FwjZinvBqAjzOOei5+h9FHfID37FkIrFcXVY157n0f5PyXglexch5q11AABgJ+t nIDwFCinFfcxYPO2rI16udV7+0fo6o1Eoew8BSYdALP9eFTNOcbLXPQqLsqQ1XOssx3n7fS7M/k VH5NZFrunYn3baerSKS8Stv9w1e8ChmSn6vh42FfhjdahZMM7v0XIa2d8FRD1nOi69cXORw//t9 sgfAw686jZnbSUNERJWq3Ce+NtDFUO573vxp2+16nCWsV0edxUktSX+WTQ5H6K3Hf2b3O2cfp4Q pztI+r7mlKQqpjPKPaPgePEYnD8GtKqbiHg2y2CE+x5IHykb8BhdhUWAfuaOK2qIk9JQ88nKPTn FnfryXZgwoB+9yDT1M/6GD3Wks2s/rnh2aDZd3G/JZwsRs+CPUl9613mgDBxwmgawntm1Su93wq 66gYZvOGRcfNWUVucN0QfagqQUuzeub2mrEwaT6eeDK9Wd+BPoVbv8seRXYgGpcUDq7zFTGGUzz ap8o/xNpcZvT1uXKWWJKSLs2J4c9AC7INVkrUpYAg56VcJbIhtZWP1rT2hyXdTPiON0nhBI5vrJ YHpcDFVrjhS7LJ27wK5/OSqsWCyqpCSwgD4M+j23HZcjo5v+1wHi1Dpg6KqRpZtniSePf2u108o 6Xd8346Yohxj7lg== X-Developer-Key: i=louis.chauvet@bootlin.com; a=openpgp; fpr=8B7104AE9A272D6693F527F2EC1883F55E0B40A5 X-GND-Sasl: louis.chauvet@bootlin.com The pre_mul_alpha_blend is dedicated to blending, so to avoid mixing different concepts (coordinate calculation and color management), extract the x_limit and x_dst computation outside of this helper. It also increases the maintainability by grouping the computation related to coordinates in the same place: the loop in `blend`. Signed-off-by: Louis Chauvet Reviewed-by: Pekka Paalanen --- drivers/gpu/drm/vkms/vkms_composer.c | 40 +++++++++++++++++---------------= ---- 1 file changed, 19 insertions(+), 21 deletions(-) diff --git a/drivers/gpu/drm/vkms/vkms_composer.c b/drivers/gpu/drm/vkms/vk= ms_composer.c index da0651a94c9b..45b111c74884 100644 --- a/drivers/gpu/drm/vkms/vkms_composer.c +++ b/drivers/gpu/drm/vkms/vkms_composer.c @@ -24,34 +24,30 @@ static u16 pre_mul_blend_channel(u16 src, u16 dst, u16 = alpha) =20 /** * pre_mul_alpha_blend - alpha blending equation - * @frame_info: Source framebuffer's metadata * @stage_buffer: The line with the pixels from src_plane * @output_buffer: A line buffer that receives all the blends output + * @x_start: The start offset + * @pixel_count: The number of pixels to blend * - * Using the information from the `frame_info`, this blends only the - * necessary pixels from the `stage_buffer` to the `output_buffer` - * using premultiplied blend formula. + * The pixels 0..@pixel_count in stage_buffer are blended at @x_start..@x_= start+@pixel_count in + * output_buffer. * * The current DRM assumption is that pixel color values have been already * pre-multiplied with the alpha channel values. See more * drm_plane_create_blend_mode_property(). Also, this formula assumes a * completely opaque background. */ -static void pre_mul_alpha_blend(struct vkms_frame_info *frame_info, - struct line_buffer *stage_buffer, - struct line_buffer *output_buffer) +static void pre_mul_alpha_blend(const struct line_buffer *stage_buffer, + struct line_buffer *output_buffer, int x_start, int pixel_count) { - int x_dst =3D frame_info->dst.x1; - struct pixel_argb_u16 *out =3D output_buffer->pixels + x_dst; - struct pixel_argb_u16 *in =3D stage_buffer->pixels; - int x_limit =3D min_t(size_t, drm_rect_width(&frame_info->dst), - stage_buffer->n_pixels); - - for (int x =3D 0; x < x_limit; x++) { - out[x].a =3D (u16)0xffff; - out[x].r =3D pre_mul_blend_channel(in[x].r, out[x].r, in[x].a); - out[x].g =3D pre_mul_blend_channel(in[x].g, out[x].g, in[x].a); - out[x].b =3D pre_mul_blend_channel(in[x].b, out[x].b, in[x].a); + struct pixel_argb_u16 *out =3D &output_buffer->pixels[x_start]; + const struct pixel_argb_u16 *in =3D stage_buffer->pixels; + + for (int i =3D 0; i < pixel_count; i++) { + out[i].a =3D (u16)0xffff; + out[i].r =3D pre_mul_blend_channel(in[i].r, out[i].r, in[i].a); + out[i].g =3D pre_mul_blend_channel(in[i].g, out[i].g, in[i].a); + out[i].b =3D pre_mul_blend_channel(in[i].b, out[i].b, in[i].a); } } =20 @@ -183,7 +179,7 @@ static void blend(struct vkms_writeback_job *wb, { struct vkms_plane_state **plane =3D crtc_state->active_planes; u32 n_active_planes =3D crtc_state->num_active_planes; - int y_pos; + int y_pos, x_dst, pixel_count; =20 const struct pixel_argb_u16 background_color =3D { .a =3D 0xffff }; =20 @@ -201,14 +197,16 @@ static void blend(struct vkms_writeback_job *wb, =20 /* The active planes are composed associatively in z-order. */ for (size_t i =3D 0; i < n_active_planes; i++) { + x_dst =3D plane[i]->frame_info->dst.x1; + pixel_count =3D min_t(int, drm_rect_width(&plane[i]->frame_info->dst), + (int)stage_buffer->n_pixels); y_pos =3D get_y_pos(plane[i]->frame_info, y); =20 if (!check_limit(plane[i]->frame_info, y_pos)) continue; =20 vkms_compose_row(stage_buffer, plane[i], y_pos); - pre_mul_alpha_blend(plane[i]->frame_info, stage_buffer, - output_buffer); + pre_mul_alpha_blend(stage_buffer, output_buffer, x_dst, pixel_count); } =20 apply_lut(crtc_state, output_buffer); --=20 2.43.0