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bh=4ep0B8W0dWDgOAnvfxKLWEqaGgJI444n/Y1F+rhWVIA=; b=hwlDPPDcF2F1MNZmaN1UXUpAAFW/mtR1/yP7tF60d5d7IY64t+e5lHAc92fgzNvTQJ3GXy WuGiDLAU3X/dnDuPmfH9H+Xrqm2MiJzx+2cIorGz8TTS7fvEg9hRHEN01v5qulvVq2uJlD SPjqz/KKwJtg38RH9IATb14CyCgjAXtTauXNjMYMVfexldqNS1nLAqU1KH3ueQcpmaguho YDEDBwFUn3UMSI9r/KTOLmD1qEH0NgS6VJ0rw4VN2TwRVnqdqGB+cJe8Ec7eV2q/a3uNHg 5a+EnV37s8J0WWKk+sL36PW0AH2YGgxAR6gsEc/yIMj5GZ6pI+S/UHNGaagrmg== From: Louis Chauvet Date: Thu, 31 Oct 2024 18:53:30 +0100 Subject: [PATCH v13 6/9] 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: <20241031-yuv-v13-6-bd5463126faa@bootlin.com> References: <20241031-yuv-v13-0-bd5463126faa@bootlin.com> In-Reply-To: <20241031-yuv-v13-0-bd5463126faa@bootlin.com> To: Rodrigo Siqueira , Melissa Wen , =?utf-8?q?Ma=C3=ADra_Canal?= , Haneen Mohammed , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Jonathan Corbet , Louis Chauvet , Simona Vetter , Helen Koike , rdunlap@infradead.org, arthurgrillo@riseup.net, pekka.paalanen@haloniitty.fi, Simona Vetter Cc: dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, thomas.petazzoni@bootlin.com, jeremie.dautheribes@bootlin.com, miquel.raynal@bootlin.com, seanpaul@google.com, marcheu@google.com, nicolejadeyee@google.com, Pekka Paalanen X-Mailer: b4 0.14.1 X-Developer-Signature: v=1; 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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`. Reviewed-by: Pekka Paalanen Signed-off-by: Louis Chauvet --- 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 931e214b225c..ecac0bc858a0 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 2.46.2