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Date:   Sat, 9 Nov 2019 12:50:03 +0100
From:   Hans Verkuil <hverkuil-cisco@...all.nl>
To:     Guilherme Alcarde Gallo <gagallo7@...il.com>,
        helen.koike@...labora.com, drocha.figueiredo@...il.com,
        skhan@...uxfoundation.org, mchehab@...nel.org,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        lkcamp@...ts.libreplanetbr.org, kieran.bingham@...asonboard.com,
        jacopo@...ndi.org, laurent.pinchart@...asonboard.com,
        niklas.soderlund@...natech.se, gabrielabittencourt00@...il.com,
        pedro@...raco.de
Subject: Re: [PATCH v4] media: vimc: Implement get/set selection in sink

On 11/8/19 3:45 AM, Guilherme Alcarde Gallo wrote:
> Add support for the sink pad of scaler subdevice to respond
> VIDIOC_G_SELECTION and VIDIOC_S_SELECTION ioctls with the following
> targets: V4L2_SEL_TGT_COMPOSE_BOUNDS and V4L2_SEL_TGT_CROP.
> 
> * Add new const struct crop_rect_default to initialize subdev scaler
>   properly.
> * Make changes in sink pad format reflect to the crop rectangle. E.g.
>   changing the frame format to a smaller size one can make the former
>   crop rectangle selects a non existing frame area. To solve this
>   situation the crop rectangle is clamped to the frame boundaries.
> * Clamp crop rectangle respecting the sink bounds during set_selection
>   ioctl.
> 
> Signed-off-by: Guilherme Alcarde Gallo <gagallo7@...il.com>
> Co-developed-by: Danilo Figueiredo Rocha <drocha.figueiredo@...il.com>
> Signed-off-by: Danilo Figueiredo Rocha <drocha.figueiredo@...il.com>
> Acked-by: Helen Koike <helen.koike@...labora.com>
> 
> ---
> Changes in V4:
> * Revert an unnecessary change in headers include order.
> * Sort the declaration order for local variables in function by the size
>   descending.
> 
> Changes in V3:
> * Sort the headers in alphabetical order.
> * Change all functions prefix to 'vimc_sca_'.
> * Remove useless case.
> * Change commit message subject.
> 
> Changes in V2:
> * Use v4l2_rect_map_inside to clamp the crop rectangle.
> * Do the crop rectangle clamping after changing sink format.
> * Implement try ioctls for selection with CROP* targets.
> * Treat tiny rectangles with area smaller than minimal dimensions of
>   vimc frames.
> * Allow user to get selection when the streaming is on.
> * Reuse bound rectangle generation in a static function.
> * Disable get_selection for Source pads as we did before with
>   set_selection.
> ---
> ---
>  drivers/media/platform/vimc/vimc-scaler.c | 168 ++++++++++++++++++++--
>  1 file changed, 153 insertions(+), 15 deletions(-)
> 
> diff --git a/drivers/media/platform/vimc/vimc-scaler.c b/drivers/media/platform/vimc/vimc-scaler.c
> index 2f88a7d9d67b..36425cffc0ad 100644
> --- a/drivers/media/platform/vimc/vimc-scaler.c
> +++ b/drivers/media/platform/vimc/vimc-scaler.c
> @@ -8,6 +8,7 @@
>  #include <linux/moduleparam.h>
>  #include <linux/vmalloc.h>
>  #include <linux/v4l2-mediabus.h>
> +#include <media/v4l2-rect.h>
>  #include <media/v4l2-subdev.h>
>  
>  #include "vimc-common.h"
> @@ -18,6 +19,9 @@ MODULE_PARM_DESC(sca_mult, " the image size multiplier");
>  
>  #define MAX_ZOOM	8
>  
> +#define VIMC_SCA_FMT_WIDTH_DEFAULT  640
> +#define VIMC_SCA_FMT_HEIGHT_DEFAULT 480
> +
>  struct vimc_sca_device {
>  	struct vimc_ent_device ved;
>  	struct v4l2_subdev sd;
> @@ -25,6 +29,7 @@ struct vimc_sca_device {
>  	 * with the width and hight multiplied by mult
>  	 */
>  	struct v4l2_mbus_framefmt sink_fmt;
> +	struct v4l2_rect crop_rect;
>  	/* Values calculated when the stream starts */
>  	u8 *src_frame;
>  	unsigned int src_line_size;
> @@ -33,22 +38,64 @@ struct vimc_sca_device {
>  };
>  
>  static const struct v4l2_mbus_framefmt sink_fmt_default = {
> -	.width = 640,
> -	.height = 480,
> +	.width = VIMC_SCA_FMT_WIDTH_DEFAULT,
> +	.height = VIMC_SCA_FMT_HEIGHT_DEFAULT,
>  	.code = MEDIA_BUS_FMT_RGB888_1X24,
>  	.field = V4L2_FIELD_NONE,
>  	.colorspace = V4L2_COLORSPACE_DEFAULT,
>  };
>  
> +static const struct v4l2_rect crop_rect_default = {
> +	.width = VIMC_SCA_FMT_WIDTH_DEFAULT,
> +	.height = VIMC_SCA_FMT_HEIGHT_DEFAULT,
> +	.top = 0,
> +	.left = 0,
> +};
> +
> +static const struct v4l2_rect crop_rect_min = {
> +	.width = VIMC_FRAME_MIN_WIDTH,
> +	.height = VIMC_FRAME_MIN_HEIGHT,
> +	.top = 0,
> +	.left = 0,
> +};
> +
> +static struct v4l2_rect
> +vimc_sca_get_crop_bound_sink(const struct v4l2_mbus_framefmt *sink_fmt)
> +{
> +	/* Get the crop bounds to clamp the crop rectangle correctly */
> +	struct v4l2_rect r = {
> +		.left = 0,
> +		.top = 0,
> +		.width = sink_fmt->width,
> +		.height = sink_fmt->height,
> +	};
> +	return r;
> +}
> +
> +static void vimc_sca_adjust_sink_crop(struct v4l2_rect *r,
> +				      const struct v4l2_mbus_framefmt *sink_fmt)
> +{
> +	const struct v4l2_rect sink_rect =
> +		vimc_sca_get_crop_bound_sink(sink_fmt);
> +
> +	/* Disallow rectangles smaller than the minimal one. */
> +	v4l2_rect_set_min_size(r, &crop_rect_min);
> +	v4l2_rect_map_inside(r, &sink_rect);
> +}
> +
>  static int vimc_sca_init_cfg(struct v4l2_subdev *sd,
>  			     struct v4l2_subdev_pad_config *cfg)
>  {
>  	struct v4l2_mbus_framefmt *mf;
> +	struct v4l2_rect *r;
>  	unsigned int i;
>  
>  	mf = v4l2_subdev_get_try_format(sd, cfg, 0);
>  	*mf = sink_fmt_default;
>  
> +	r = v4l2_subdev_get_try_crop(sd, cfg, 0);
> +	*r = crop_rect_default;
> +
>  	for (i = 1; i < sd->entity.num_pads; i++) {
>  		mf = v4l2_subdev_get_try_format(sd, cfg, i);
>  		*mf = sink_fmt_default;
> @@ -107,16 +154,21 @@ static int vimc_sca_get_fmt(struct v4l2_subdev *sd,
>  			    struct v4l2_subdev_format *format)
>  {
>  	struct vimc_sca_device *vsca = v4l2_get_subdevdata(sd);
> +	struct v4l2_rect *crop_rect;
>  
>  	/* Get the current sink format */
> -	format->format = (format->which == V4L2_SUBDEV_FORMAT_TRY) ?
> -			 *v4l2_subdev_get_try_format(sd, cfg, 0) :
> -			 vsca->sink_fmt;
> +	if (format->which == V4L2_SUBDEV_FORMAT_TRY) {
> +		format->format = *v4l2_subdev_get_try_format(sd, cfg, 0);
> +		crop_rect = v4l2_subdev_get_try_crop(sd, cfg, 0);
> +	} else {
> +		format->format = vsca->sink_fmt;
> +		crop_rect = &vsca->crop_rect;
> +	}
>  
>  	/* Scale the frame size for the source pad */
>  	if (VIMC_IS_SRC(format->pad)) {
> -		format->format.width = vsca->sink_fmt.width * sca_mult;
> -		format->format.height = vsca->sink_fmt.height * sca_mult;
> +		format->format.width = crop_rect->width * sca_mult;
> +		format->format.height = crop_rect->height * sca_mult;
>  	}
>  
>  	return 0;
> @@ -148,6 +200,7 @@ static int vimc_sca_set_fmt(struct v4l2_subdev *sd,
>  {
>  	struct vimc_sca_device *vsca = v4l2_get_subdevdata(sd);
>  	struct v4l2_mbus_framefmt *sink_fmt;
> +	struct v4l2_rect *crop_rect;
>  
>  	if (fmt->which == V4L2_SUBDEV_FORMAT_ACTIVE) {
>  		/* Do not change the format while stream is on */
> @@ -155,8 +208,10 @@ static int vimc_sca_set_fmt(struct v4l2_subdev *sd,
>  			return -EBUSY;
>  
>  		sink_fmt = &vsca->sink_fmt;
> +		crop_rect = &vsca->crop_rect;
>  	} else {
>  		sink_fmt = v4l2_subdev_get_try_format(sd, cfg, 0);
> +		crop_rect = v4l2_subdev_get_try_crop(sd, cfg, 0);
>  	}
>  
>  	/*
> @@ -165,8 +220,8 @@ static int vimc_sca_set_fmt(struct v4l2_subdev *sd,
>  	 */
>  	if (VIMC_IS_SRC(fmt->pad)) {
>  		fmt->format = *sink_fmt;
> -		fmt->format.width = sink_fmt->width * sca_mult;
> -		fmt->format.height = sink_fmt->height * sca_mult;
> +		fmt->format.width = crop_rect->width * sca_mult;
> +		fmt->format.height = crop_rect->height * sca_mult;
>  	} else {
>  		/* Set the new format in the sink pad */
>  		vimc_sca_adjust_sink_fmt(&fmt->format);
> @@ -184,6 +239,80 @@ static int vimc_sca_set_fmt(struct v4l2_subdev *sd,
>  			fmt->format.xfer_func, fmt->format.ycbcr_enc);
>  
>  		*sink_fmt = fmt->format;
> +
> +		/* Do the crop, but respect the current bounds */
> +		vimc_sca_adjust_sink_crop(crop_rect, sink_fmt);
> +	}
> +
> +	return 0;
> +}
> +
> +static int vimc_sca_get_selection(struct v4l2_subdev *sd,
> +				  struct v4l2_subdev_pad_config *cfg,
> +				  struct v4l2_subdev_selection *sel)
> +{
> +	struct vimc_sca_device *vsca = v4l2_get_subdevdata(sd);
> +	struct v4l2_mbus_framefmt *sink_fmt;
> +	struct v4l2_rect *crop_rect;
> +
> +	if (VIMC_IS_SRC(sel->pad))
> +		return -EINVAL;
> +
> +	if (sel->which == V4L2_SUBDEV_FORMAT_ACTIVE) {
> +		sink_fmt = &vsca->sink_fmt;
> +		crop_rect = &vsca->crop_rect;
> +	} else {
> +		sink_fmt = v4l2_subdev_get_try_format(sd, cfg, 0);
> +		crop_rect = v4l2_subdev_get_try_crop(sd, cfg, 0);
> +	}
> +
> +	switch (sel->target) {
> +	case V4L2_SEL_TGT_CROP:
> +		sel->r = *crop_rect;
> +		break;
> +	case V4L2_SEL_TGT_CROP_BOUNDS:
> +		sel->r = vimc_sca_get_crop_bound_sink(sink_fmt);
> +		break;
> +	default:
> +		return -EINVAL;
> +	}
> +
> +	return 0;
> +}
> +
> +static int vimc_sca_set_selection(struct v4l2_subdev *sd,
> +				  struct v4l2_subdev_pad_config *cfg,
> +				  struct v4l2_subdev_selection *sel)
> +{
> +	struct vimc_sca_device *vsca = v4l2_get_subdevdata(sd);
> +	struct v4l2_mbus_framefmt *sink_fmt;
> +	struct v4l2_rect *crop_rect;
> +	struct v4l2_rect sink_rect;
> +
> +	if (VIMC_IS_SRC(sel->pad))
> +		return -EINVAL;
> +
> +	if (sel->which == V4L2_SUBDEV_FORMAT_ACTIVE) {
> +		/* Do not change the format while stream is on */
> +		if (vsca->src_frame)
> +			return -EBUSY;
> +
> +		crop_rect = &vsca->crop_rect;
> +		sink_fmt = &vsca->sink_fmt;
> +	} else {
> +		crop_rect = v4l2_subdev_get_try_crop(sd, cfg, 0);
> +		sink_fmt = v4l2_subdev_get_try_format(sd, cfg, 0);
> +	}
> +
> +	switch (sel->target) {
> +	case V4L2_SEL_TGT_CROP:
> +		/* Do the crop, but respect the current bounds */
> +		sink_rect = vimc_sca_get_crop_bound_sink(sink_fmt);
> +		vimc_sca_adjust_sink_crop(&sel->r, sink_fmt);
> +		*crop_rect = sel->r;

drivers/media/platform/vimc/vimc-scaler.c: In function ‘vimc_sca_set_selection’:
drivers/media/platform/vimc/vimc-scaler.c:290:19: warning: variable ‘sink_rect’ set but not used [-Wunused-but-set-variable]
  290 |  struct v4l2_rect sink_rect;
      |                   ^~~~~~~~~

Something is wrong here.

Regards,

	Hans

> +		break;
> +	default:
> +		return -EINVAL;
>  	}
>  
>  	return 0;
> @@ -195,6 +324,8 @@ static const struct v4l2_subdev_pad_ops vimc_sca_pad_ops = {
>  	.enum_frame_size	= vimc_sca_enum_frame_size,
>  	.get_fmt		= vimc_sca_get_fmt,
>  	.set_fmt		= vimc_sca_set_fmt,
> +	.get_selection		= vimc_sca_get_selection,
> +	.set_selection		= vimc_sca_set_selection,
>  };
>  
>  static int vimc_sca_s_stream(struct v4l2_subdev *sd, int enable)
> @@ -213,11 +344,11 @@ static int vimc_sca_s_stream(struct v4l2_subdev *sd, int enable)
>  		vsca->bpp = vpix->bpp;
>  
>  		/* Calculate the width in bytes of the src frame */
> -		vsca->src_line_size = vsca->sink_fmt.width *
> +		vsca->src_line_size = vsca->crop_rect.width *
>  				      sca_mult * vsca->bpp;
>  
>  		/* Calculate the frame size of the source pad */
> -		frame_size = vsca->src_line_size * vsca->sink_fmt.height *
> +		frame_size = vsca->src_line_size * vsca->crop_rect.height *
>  			     sca_mult;
>  
>  		/* Allocate the frame buffer. Use vmalloc to be able to
> @@ -259,9 +390,10 @@ static void vimc_sca_fill_pix(u8 *const ptr,
>  }
>  
>  static void vimc_sca_scale_pix(const struct vimc_sca_device *const vsca,
> -			       const unsigned int lin, const unsigned int col,
> +			       unsigned int lin, unsigned int col,
>  			       const u8 *const sink_frame)
>  {
> +	const struct v4l2_rect crop_rect = vsca->crop_rect;
>  	unsigned int i, j, index;
>  	const u8 *pixel;
>  
> @@ -278,8 +410,10 @@ static void vimc_sca_scale_pix(const struct vimc_sca_device *const vsca,
>  	/* point to the place we are going to put the first pixel
>  	 * in the scaled src frame
>  	 */
> +	lin -= crop_rect.top;
> +	col -= crop_rect.left;
>  	index = VIMC_FRAME_INDEX(lin * sca_mult, col * sca_mult,
> -				 vsca->sink_fmt.width * sca_mult, vsca->bpp);
> +				 crop_rect.width * sca_mult, vsca->bpp);
>  
>  	dev_dbg(vsca->ved.dev, "sca: %s: scale_pix src pos %dx%d, index %d\n",
>  		vsca->sd.name, lin * sca_mult, col * sca_mult, index);
> @@ -307,12 +441,13 @@ static void vimc_sca_scale_pix(const struct vimc_sca_device *const vsca,
>  static void vimc_sca_fill_src_frame(const struct vimc_sca_device *const vsca,
>  				    const u8 *const sink_frame)
>  {
> +	const struct v4l2_rect r = vsca->crop_rect;
>  	unsigned int i, j;
>  
>  	/* Scale each pixel from the original sink frame */
>  	/* TODO: implement scale down, only scale up is supported for now */
> -	for (i = 0; i < vsca->sink_fmt.height; i++)
> -		for (j = 0; j < vsca->sink_fmt.width; j++)
> +	for (i = r.top; i < r.top + r.height; i++)
> +		for (j = r.left; j < r.left + r.width; j++)
>  			vimc_sca_scale_pix(vsca, i, j, sink_frame);
>  }
>  
> @@ -384,5 +519,8 @@ struct vimc_ent_device *vimc_sca_add(struct vimc_device *vimc,
>  	/* Initialize the frame format */
>  	vsca->sink_fmt = sink_fmt_default;
>  
> +	/* Initialize the crop selection */
> +	vsca->crop_rect = crop_rect_default;
> +
>  	return &vsca->ved;
>  }
> 

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