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[media] v4l: s5p-tv: mixer: add support for selection API
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This patch add support for V4L2 selection API to s5p-tv driver.  Moreover it
removes old API for cropping.  Old applications would still work because the
crop ioctls are emulated using the selection API.

Signed-off-by: Tomasz Stanislawski <t.stanislaws@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
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Tomasz Stanislawski authored and Mauro Carvalho Chehab committed Jan 11, 2012
1 parent 992efef commit 0d066d3
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Showing 4 changed files with 425 additions and 196 deletions.
14 changes: 13 additions & 1 deletion drivers/media/video/s5p-tv/mixer.h
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Original file line number Diff line number Diff line change
Expand Up @@ -86,6 +86,17 @@ struct mxr_crop {
unsigned int field;
};

/** stages of geometry operations */
enum mxr_geometry_stage {
MXR_GEOMETRY_SINK,
MXR_GEOMETRY_COMPOSE,
MXR_GEOMETRY_CROP,
MXR_GEOMETRY_SOURCE,
};

/* flag indicating that offset should be 0 */
#define MXR_NO_OFFSET 0x80000000

/** description of transformation from source to destination image */
struct mxr_geometry {
/** cropping for source image */
Expand Down Expand Up @@ -133,7 +144,8 @@ struct mxr_layer_ops {
/** streaming stop/start */
void (*stream_set)(struct mxr_layer *, int);
/** adjusting geometry */
void (*fix_geometry)(struct mxr_layer *);
void (*fix_geometry)(struct mxr_layer *,
enum mxr_geometry_stage, unsigned long);
};

/** layer instance, a single window and content displayed on output */
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157 changes: 121 additions & 36 deletions drivers/media/video/s5p-tv/mixer_grp_layer.c
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Original file line number Diff line number Diff line change
Expand Up @@ -101,47 +101,132 @@ static void mxr_graph_format_set(struct mxr_layer *layer)
layer->fmt, &layer->geo);
}

static void mxr_graph_fix_geometry(struct mxr_layer *layer)
static inline unsigned int closest(unsigned int x, unsigned int a,
unsigned int b, unsigned long flags)
{
unsigned int mid = (a + b) / 2;

/* choosing closest value with constraints according to table:
* -------------+-----+-----+-----+-------+
* flags | 0 | LE | GE | LE|GE |
* -------------+-----+-----+-----+-------+
* x <= a | a | a | a | a |
* a < x <= mid | a | a | b | a |
* mid < x < b | b | a | b | b |
* b <= x | b | b | b | b |
* -------------+-----+-----+-----+-------+
*/

/* remove all non-constraint flags */
flags &= V4L2_SEL_FLAG_LE | V4L2_SEL_FLAG_GE;

if (x <= a)
return a;
if (x >= b)
return b;
if (flags == V4L2_SEL_FLAG_LE)
return a;
if (flags == V4L2_SEL_FLAG_GE)
return b;
if (x <= mid)
return a;
return b;
}

static inline unsigned int do_center(unsigned int center,
unsigned int size, unsigned int upper, unsigned int flags)
{
unsigned int lower;

if (flags & MXR_NO_OFFSET)
return 0;

lower = center - min(center, size / 2);
return min(lower, upper - size);
}

static void mxr_graph_fix_geometry(struct mxr_layer *layer,
enum mxr_geometry_stage stage, unsigned long flags)
{
struct mxr_geometry *geo = &layer->geo;
struct mxr_crop *src = &geo->src;
struct mxr_crop *dst = &geo->dst;
unsigned int x_center, y_center;

/* limit to boundary size */
geo->src.full_width = clamp_val(geo->src.full_width, 1, 32767);
geo->src.full_height = clamp_val(geo->src.full_height, 1, 2047);
geo->src.width = clamp_val(geo->src.width, 1, geo->src.full_width);
geo->src.width = min(geo->src.width, 2047U);
/* not possible to crop of Y axis */
geo->src.y_offset = min(geo->src.y_offset, geo->src.full_height - 1);
geo->src.height = geo->src.full_height - geo->src.y_offset;
/* limitting offset */
geo->src.x_offset = min(geo->src.x_offset,
geo->src.full_width - geo->src.width);

/* setting position in output */
geo->dst.width = min(geo->dst.width, geo->dst.full_width);
geo->dst.height = min(geo->dst.height, geo->dst.full_height);

/* Mixer supports only 1x and 2x scaling */
if (geo->dst.width >= 2 * geo->src.width) {
geo->x_ratio = 1;
geo->dst.width = 2 * geo->src.width;
} else {
geo->x_ratio = 0;
geo->dst.width = geo->src.width;
}
switch (stage) {

if (geo->dst.height >= 2 * geo->src.height) {
geo->y_ratio = 1;
geo->dst.height = 2 * geo->src.height;
} else {
geo->y_ratio = 0;
geo->dst.height = geo->src.height;
}
case MXR_GEOMETRY_SINK: /* nothing to be fixed here */
flags = 0;
/* fall through */

case MXR_GEOMETRY_COMPOSE:
/* remember center of the area */
x_center = dst->x_offset + dst->width / 2;
y_center = dst->y_offset + dst->height / 2;
/* round up/down to 2 multiple depending on flags */
if (flags & V4L2_SEL_FLAG_LE) {
dst->width = round_down(dst->width, 2);
dst->height = round_down(dst->height, 2);
} else {
dst->width = round_up(dst->width, 2);
dst->height = round_up(dst->height, 2);
}
/* assure that compose rect is inside display area */
dst->width = min(dst->width, dst->full_width);
dst->height = min(dst->height, dst->full_height);

/* ensure that compose is reachable using 2x scaling */
dst->width = min(dst->width, 2 * src->full_width);
dst->height = min(dst->height, 2 * src->full_height);

/* setup offsets */
dst->x_offset = do_center(x_center, dst->width,
dst->full_width, flags);
dst->y_offset = do_center(y_center, dst->height,
dst->full_height, flags);
flags = 0;
/* fall through */

geo->dst.x_offset = min(geo->dst.x_offset,
geo->dst.full_width - geo->dst.width);
geo->dst.y_offset = min(geo->dst.y_offset,
geo->dst.full_height - geo->dst.height);
case MXR_GEOMETRY_CROP:
/* remember center of the area */
x_center = src->x_offset + src->width / 2;
y_center = src->y_offset + src->height / 2;
/* ensure that cropping area lies inside the buffer */
if (src->full_width < dst->width)
src->width = dst->width / 2;
else
src->width = closest(src->width, dst->width / 2,
dst->width, flags);

if (src->width == dst->width)
geo->x_ratio = 0;
else
geo->x_ratio = 1;

if (src->full_height < dst->height)
src->height = dst->height / 2;
else
src->height = closest(src->height, dst->height / 2,
dst->height, flags);

if (src->height == dst->height)
geo->y_ratio = 0;
else
geo->y_ratio = 1;

/* setup offsets */
src->x_offset = do_center(x_center, src->width,
src->full_width, flags);
src->y_offset = do_center(y_center, src->height,
src->full_height, flags);
flags = 0;
/* fall through */
case MXR_GEOMETRY_SOURCE:
src->full_width = clamp_val(src->full_width,
src->width + src->x_offset, 32767);
src->full_height = clamp_val(src->full_height,
src->height + src->y_offset, 2047);
};
}

/* PUBLIC API */
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