1 // SPDX-License-Identifier: GPL-2.0+
20 	new_color = (src * 0xffff + dst * (0xffff - alpha));  in pre_mul_blend_channel()
26  * pre_mul_alpha_blend - alpha blending equation
36  * pre-multiplied with the alpha channel values. See more
43 	struct pixel_argb_u16 *out = &output_buffer->pixels[x_start];  in pre_mul_alpha_blend()
44 	const struct pixel_argb_u16 *in = &stage_buffer->pixels[x_start];  in pre_mul_alpha_blend()
58 	for (size_t i = 0; i < output_buffer->n_pixels; i++)  in fill_background()
59 		output_buffer->pixels[i] = *background_color;  in fill_background()
62 // lerp(a, b, t) = a + (b - a) * t
68 	s64 delta = drm_fixp_mul(b_fp - a_fp, t);  in lerp_u16()
77 	return drm_fixp_mul(color_channel_fp, lut->channel_value2index_ratio);  in get_lut_index()
104 	floor_lut_value = (__u16 *)&lut->base[drm_fixp2int(lut_index)];  in apply_lut_to_channel_value()
105 	if (drm_fixp2int(lut_index) == (lut->lut_length - 1))  in apply_lut_to_channel_value()
109 		ceil_lut_value = (__u16 *)&lut->base[drm_fixp2int_ceil(lut_index)];  in apply_lut_to_channel_value()
120 	if (!crtc_state->gamma_lut.base)  in apply_lut()
123 	if (!crtc_state->gamma_lut.lut_length)  in apply_lut()
126 	for (size_t x = 0; x < output_buffer->n_pixels; x++) {  in apply_lut()
127 		struct pixel_argb_u16 *pixel = &output_buffer->pixels[x];  in apply_lut()
129 		pixel->r = apply_lut_to_channel_value(&crtc_state->gamma_lut, pixel->r, LUT_RED);  in apply_lut()
130 		pixel->g = apply_lut_to_channel_value(&crtc_state->gamma_lut, pixel->g, LUT_GREEN);  in apply_lut()
131 		pixel->b = apply_lut_to_channel_value(&crtc_state->gamma_lut, pixel->b, LUT_BLUE);  in apply_lut()
136  * direction_for_rotation() - Get the correct reading direction for a given rotation
151 	 * Points A and B are depicted as zero-size rectangles on the CRTC.  in direction_for_rotation()
153 	 * is discovered by inverse-transforming A and B.  in direction_for_rotation()
154 	 * The reading direction is computed by rotating the vector AB (top-left to top-right) in a  in direction_for_rotation()
163 	x = tmp_b.x1 - tmp_a.x1;  in direction_for_rotation()
164 	y = tmp_b.y1 - tmp_a.y1;  in direction_for_rotation()
168 	else if (x == -1 && y == 0)  in direction_for_rotation()
172 	else if (y == -1 && x == 0)  in direction_for_rotation()
180  * clamp_line_coordinates() - Compute and clamp the coordinate to read and write during the blend
185  * @src_line: source line of the reading. Only the top-left coordinate is used. This rectangle
203 	*src_x_start = src_line->x1;  in clamp_line_coordinates()
204 	*src_y_start = src_line->y1;  in clamp_line_coordinates()
205 	*dst_x_start = current_plane->frame_info->dst.x1;  in clamp_line_coordinates()
230 			*dst_x_start -= *src_x_start;  in clamp_line_coordinates()
233 		if (*src_x_start + *pixel_count > current_plane->frame_info->fb->width)  in clamp_line_coordinates()
234 			*pixel_count = max(0, (int)current_plane->frame_info->fb->width -  in clamp_line_coordinates()
241 			*dst_x_start -= *src_y_start;  in clamp_line_coordinates()
244 		if (*src_y_start + *pixel_count > current_plane->frame_info->fb->height)  in clamp_line_coordinates()
245 			*pixel_count = max(0, (int)current_plane->frame_info->fb->height -  in clamp_line_coordinates()
252  * blend_line() - Blend a line from a plane to the output buffer
268 	if (y < current_plane->frame_info->dst.y1 ||  in blend_line()
269 	    y >= current_plane->frame_info->dst.y2)  in blend_line()
277 	dst_line = DRM_RECT_INIT(current_plane->frame_info->dst.x1, y,  in blend_line()
278 				 drm_rect_width(&current_plane->frame_info->dst),  in blend_line()
281 	drm_rect_fp_to_int(&tmp_src, &current_plane->frame_info->src);  in blend_line()
299 	 * - Cancel the offset of the dst buffer.  in blend_line()
300 	 * - Invert the rotation. This assumes that  in blend_line()
303 	 * - Apply the offset of the source rectangle to the coordinate.  in blend_line()
305 	drm_rect_translate(&src_line, -current_plane->frame_info->dst.x1,  in blend_line()
306 			   -current_plane->frame_info->dst.y1);  in blend_line()
309 			    current_plane->frame_info->rotation);  in blend_line()
315 		direction_for_rotation(current_plane->frame_info->rotation);  in blend_line()
329 	 * src_line is the top-left corner, so when reading READ_RIGHT_TO_LEFT or  in blend_line()
330 	 * READ_BOTTOM_TO_TOP, it must be changed to the top-right/bottom-left  in blend_line()
335 		src_x_start += pixel_count - 1;  in blend_line()
338 		src_y_start += pixel_count - 1;  in blend_line()
342 	 * Perform the conversion and the blending  in blend_line()
348 	current_plane->pixel_read_line(current_plane, src_x_start, src_y_start, direction,  in blend_line()
349 				       pixel_count, &stage_buffer->pixels[dst_x_start]);  in blend_line()
356  * blend - blend the pixels from all planes and compute crc
373 	struct vkms_plane_state **plane = crtc_state->active_planes;  in blend()
374 	u32 n_active_planes = crtc_state->num_active_planes;  in blend()
378 	int crtc_y_limit = crtc_state->base.mode.vdisplay;  in blend()
379 	int crtc_x_limit = crtc_state->base.mode.hdisplay;  in blend()
382 	 * The planes are composed line-by-line to avoid heavy memory usage. It is a necessary  in blend()
383 	 * complexity to avoid poor blending performance.  in blend()
391 		/* The active planes are composed associatively in z-order. */  in blend()
398 		*crc32 = crc32_le(*crc32, (void *)output_buffer->pixels, row_size);  in blend()
408 	struct vkms_plane_state **planes = crtc_state->active_planes;  in check_format_funcs()
409 	u32 n_active_planes = crtc_state->num_active_planes;  in check_format_funcs()
412 		if (!planes[i]->pixel_read_line)  in check_format_funcs()
413 			return -1;  in check_format_funcs()
415 	if (active_wb && !active_wb->pixel_write)  in check_format_funcs()
416 		return -1;  in check_format_funcs()
423 	struct vkms_plane_state **plane_state = crtc_state->active_planes;  in check_iosys_map()
424 	u32 n_active_planes = crtc_state->num_active_planes;  in check_iosys_map()
427 		if (iosys_map_is_null(&plane_state[i]->frame_info->map[0]))  in check_iosys_map()
428 			return -1;  in check_iosys_map()
450 		return -EINVAL;  in compose_active_planes()
453 		return -EINVAL;  in compose_active_planes()
455 	line_width = crtc_state->base.mode.hdisplay;  in compose_active_planes()
462 		return -ENOMEM;  in compose_active_planes()
468 		ret = -ENOMEM;  in compose_active_planes()
483  * vkms_composer_worker - ordered work_struct to compute CRC
496 	struct drm_crtc *crtc = crtc_state->base.crtc;  in vkms_composer_worker()
497 	struct vkms_writeback_job *active_wb = crtc_state->active_writeback;  in vkms_composer_worker()
504 	spin_lock_irq(&out->composer_lock);  in vkms_composer_worker()
505 	frame_start = crtc_state->frame_start;  in vkms_composer_worker()
506 	frame_end = crtc_state->frame_end;  in vkms_composer_worker()
507 	crc_pending = crtc_state->crc_pending;  in vkms_composer_worker()
508 	wb_pending = crtc_state->wb_pending;  in vkms_composer_worker()
509 	crtc_state->frame_start = 0;  in vkms_composer_worker()
510 	crtc_state->frame_end = 0;  in vkms_composer_worker()
511 	crtc_state->crc_pending = false;  in vkms_composer_worker()
513 	if (crtc->state->gamma_lut) {  in vkms_composer_worker()
517 		crtc_state->gamma_lut.base = (struct drm_color_lut *)crtc->state->gamma_lut->data;  in vkms_composer_worker()
518 		crtc_state->gamma_lut.lut_length =  in vkms_composer_worker()
519 			crtc->state->gamma_lut->length / sizeof(struct drm_color_lut);  in vkms_composer_worker()
520 		max_lut_index_fp = drm_int2fixp(crtc_state->gamma_lut.lut_length - 1);  in vkms_composer_worker()
521 		crtc_state->gamma_lut.channel_value2index_ratio = drm_fixp_div(max_lut_index_fp,  in vkms_composer_worker()
525 		crtc_state->gamma_lut.base = NULL;  in vkms_composer_worker()
528 	spin_unlock_irq(&out->composer_lock);  in vkms_composer_worker()
546 		drm_writeback_signal_completion(&out->wb_connector, 0);  in vkms_composer_worker()
547 		spin_lock_irq(&out->composer_lock);  in vkms_composer_worker()
548 		crtc_state->wb_pending = false;  in vkms_composer_worker()
549 		spin_unlock_irq(&out->composer_lock);  in vkms_composer_worker()
578 		ret = -EINVAL;  in vkms_crc_parse_source()
591 		return -EINVAL;  in vkms_verify_crc_source()
604 		drm_crtc_vblank_get(&out->crtc);  in vkms_set_composer()
606 	spin_lock_irq(&out->lock);  in vkms_set_composer()
607 	old_enabled = out->composer_enabled;  in vkms_set_composer()
608 	out->composer_enabled = enabled;  in vkms_set_composer()
609 	spin_unlock_irq(&out->lock);  in vkms_set_composer()
612 		drm_crtc_vblank_put(&out->crtc);  in vkms_set_composer()