mpv/video/sws_utils.h

#ifndef MPLAYER_SWS_UTILS_H
#define MPLAYER_SWS_UTILS_H

#include <stdbool.h>

#include "mp_image.h"

struct mp_image;
struct mp_csp_details;

// libswscale currently requires 16 bytes alignment for row pointers and
// strides. Otherwise, it will print warnings and use slow codepaths.
// Guaranteed to be a power of 2 and > 1.
#define SWS_MIN_BYTE_ALIGN 16

extern const int mp_sws_hq_flags;

bool mp_sws_supported_format(int imgfmt);

void mp_image_swscale(struct mp_image *dst, struct mp_image *src,
                      int my_sws_flags);

void mp_image_sw_blur_scale(struct mp_image *dst, struct mp_image *src,
                            float gblur);

struct mp_sws_context {
    // User configuration. These can be changed freely, at any time.
    // mp_sws_scale() will handle the changes transparently.
    int flags;
    int brightness, contrast, saturation;
    bool force_reload;
    // These are also implicitly set by mp_sws_scale(), and thus optional.
    // Setting them before that call makes sense when using mp_sws_reinit().
    struct mp_image_params src, dst;

    // Changing these requires setting force_reload=true.
    // By default, they are NULL.
    // Freeing the mp_sws_context will deallocate these if set.
    struct SwsFilter *src_filter, *dst_filter;

    // Cached context (if any)
    struct SwsContext *sws;

    // Contains parameters for which sws is valid
    struct mp_sws_context *cached;
};

struct mp_sws_context *mp_sws_alloc(void *talloc_parent);
int mp_sws_reinit(struct mp_sws_context *ctx);
void mp_sws_set_from_cmdline(struct mp_sws_context *ctx);
int mp_sws_scale(struct mp_sws_context *ctx, struct mp_image *dst,
                 struct mp_image *src);

#endif /* MP_SWS_UTILS_H */

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