hqx magnification filters (hq2x, hq3x, hq4x) More...

#include "libavutil/opt.h"
#include "libavutil/avassert.h"
#include "libavutil/pixdesc.h"
#include "internal.h"

Classes
struct	HQXContext

struct	ThreadData

Macros
#define	OFFSET(x) offsetof(HQXContext, x)

#define	FLAGS AV_OPT_FLAG_FILTERING_PARAM\|AV_OPT_FLAG_VIDEO_PARAM

#define	YMASK 0xff0000

#define	UMASK 0x00ff00

#define	VMASK 0x0000ff

#define	ABSDIFF(a, b) (abs((int)(a)-(int)(b)))

#define	P(m, r) ((k_shuffled & (m)) == (r))

#define	DROP4(z) ((z) > 4 ? (z)-1 : (z))

#define	SHF(x, rot, n) (((x) >> ((rot) ? 7-DROP4(n) : DROP4(n)) & 1) << DROP4(p##n))

#define	WDIFF(c1, c2) yuv_diff(rgb2yuv(r2y, c1), rgb2yuv(r2y, c2))

#define	INTERP_BOOTSTRAP(rot)

#define	HQX_FUNC(size)

Typedefs
typedef int(*	hqxfunc_t) (AVFilterContext ctx, void arg, int jobnr, int nb_jobs)

typedef struct HQXContext	HQXContext

typedef struct ThreadData	ThreadData

Functions
	AVFILTER_DEFINE_CLASS (hqx)

Variables
AVFilter	ff_vf_hqx

Detailed Description

hqx magnification filters (hq2x, hq3x, hq4x)

Originally designed by Maxim Stephin.

See also: http://en.wikipedia.org/wiki/Hqx; http://web.archive.org/web/20131114143602/http://www.hiend3d.com/hq3x.html; http://blog.pkh.me/p/19-butchering-hqx-scaling-filters.html

Macro Definition Documentation

§ HQX_FUNC

#define HQX_FUNC ( size )

Value:

static int hq##size##x(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs) \
{ \
    hqx_filter(arg, jobnr, nb_jobs, size); \
    return 0; \
}

§ INTERP_BOOTSTRAP

#define INTERP_BOOTSTRAP ( rot )

Value:

const int k_shuffled = SHF(k,rot,0) | SHF(k,rot,1) | SHF(k,rot,2)   \
                         | SHF(k,rot,3) |       0      | SHF(k,rot,5)   \
                         | SHF(k,rot,6) | SHF(k,rot,7) | SHF(k,rot,8);  \
                                                                        \
    const uint32_t w0 = w[p0], w1 = w[p1],                              \
                   w3 = w[p3], w4 = w[p4], w5 = w[p5],                  \
                               w7 = w[p7]

Variable Documentation

§ ff_vf_hqx

AVFilter ff_vf_hqx

Initial value:

= {
    .name          = "hqx",
    .description   = NULL_IF_CONFIG_SMALL("Scale the input by 2, 3 or 4 using the hq*x magnification algorithm."),
    .priv_size     = sizeof(HQXContext),
    .init          = init,
    .query_formats = query_formats,
    .inputs        = hqx_inputs,
    .outputs       = hqx_outputs,
    .priv_class    = &hqx_class,
    .flags         = AVFILTER_FLAG_SLICE_THREADS,
}

Classes

Macros

Typedefs