linux/drivers/media/video/s5p-tv/mixer_grp_layer.c

271 lines
6.5 KiB
C

/*
* Samsung TV Mixer driver
*
* Copyright (c) 2010-2011 Samsung Electronics Co., Ltd.
*
* Tomasz Stanislawski, <t.stanislaws@samsung.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published
* by the Free Software Foundiation. either version 2 of the License,
* or (at your option) any later version
*/
#include "mixer.h"
#include <media/videobuf2-dma-contig.h>
/* FORMAT DEFINITIONS */
static const struct mxr_format mxr_fb_fmt_rgb565 = {
.name = "RGB565",
.fourcc = V4L2_PIX_FMT_RGB565,
.colorspace = V4L2_COLORSPACE_SRGB,
.num_planes = 1,
.plane = {
{ .width = 1, .height = 1, .size = 2 },
},
.num_subframes = 1,
.cookie = 4,
};
static const struct mxr_format mxr_fb_fmt_argb1555 = {
.name = "ARGB1555",
.num_planes = 1,
.fourcc = V4L2_PIX_FMT_RGB555,
.colorspace = V4L2_COLORSPACE_SRGB,
.plane = {
{ .width = 1, .height = 1, .size = 2 },
},
.num_subframes = 1,
.cookie = 5,
};
static const struct mxr_format mxr_fb_fmt_argb4444 = {
.name = "ARGB4444",
.num_planes = 1,
.fourcc = V4L2_PIX_FMT_RGB444,
.colorspace = V4L2_COLORSPACE_SRGB,
.plane = {
{ .width = 1, .height = 1, .size = 2 },
},
.num_subframes = 1,
.cookie = 6,
};
static const struct mxr_format mxr_fb_fmt_argb8888 = {
.name = "ARGB8888",
.fourcc = V4L2_PIX_FMT_BGR32,
.colorspace = V4L2_COLORSPACE_SRGB,
.num_planes = 1,
.plane = {
{ .width = 1, .height = 1, .size = 4 },
},
.num_subframes = 1,
.cookie = 7,
};
static const struct mxr_format *mxr_graph_format[] = {
&mxr_fb_fmt_rgb565,
&mxr_fb_fmt_argb1555,
&mxr_fb_fmt_argb4444,
&mxr_fb_fmt_argb8888,
};
/* AUXILIARY CALLBACKS */
static void mxr_graph_layer_release(struct mxr_layer *layer)
{
mxr_base_layer_unregister(layer);
mxr_base_layer_release(layer);
}
static void mxr_graph_buffer_set(struct mxr_layer *layer,
struct mxr_buffer *buf)
{
dma_addr_t addr = 0;
if (buf)
addr = vb2_dma_contig_plane_dma_addr(&buf->vb, 0);
mxr_reg_graph_buffer(layer->mdev, layer->idx, addr);
}
static void mxr_graph_stream_set(struct mxr_layer *layer, int en)
{
mxr_reg_graph_layer_stream(layer->mdev, layer->idx, en);
}
static void mxr_graph_format_set(struct mxr_layer *layer)
{
mxr_reg_graph_format(layer->mdev, layer->idx,
layer->fmt, &layer->geo);
}
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;
switch (stage) {
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 */
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 */
struct mxr_layer *mxr_graph_layer_create(struct mxr_device *mdev, int idx)
{
struct mxr_layer *layer;
int ret;
struct mxr_layer_ops ops = {
.release = mxr_graph_layer_release,
.buffer_set = mxr_graph_buffer_set,
.stream_set = mxr_graph_stream_set,
.format_set = mxr_graph_format_set,
.fix_geometry = mxr_graph_fix_geometry,
};
char name[32];
sprintf(name, "graph%d", idx);
layer = mxr_base_layer_create(mdev, idx, name, &ops);
if (layer == NULL) {
mxr_err(mdev, "failed to initialize layer(%d) base\n", idx);
goto fail;
}
layer->fmt_array = mxr_graph_format;
layer->fmt_array_size = ARRAY_SIZE(mxr_graph_format);
ret = mxr_base_layer_register(layer);
if (ret)
goto fail_layer;
return layer;
fail_layer:
mxr_base_layer_release(layer);
fail:
return NULL;
}