280 typedef struct SwsContext {  struct
284     const AVClass *av_class;
290     SwsFunc swscale;
291     int srcW;                     ///< Width  of source      luma/alpha planes.
292     int srcH;                     ///< Height of source      luma/alpha planes.
293     int dstH;                     ///< Height of destination luma/alpha planes.
317     struct SwsContext *cascaded_context[3];  argument
318     int cascaded_tmpStride[4];
319     uint8_t *cascaded_tmp[4];
320     int cascaded1_tmpStride[4];
321     uint8_t *cascaded1_tmp[4];
322     int cascaded_mainindex;
324     double gamma_value;
325     int gamma_flag;
326     int is_internal_gamma;
327     uint16_t *gamma;
328     uint16_t *inv_gamma;
330     int numDesc;
331     int descIndex[2];
332     int numSlice;
333     struct SwsSlice *slice;
334     struct SwsFilterDescriptor *desc;
336     uint32_t pal_yuv[256];
337     uint32_t pal_rgb[256];
339     float uint2float_lut[256];
351 …stInLumBuf;             ///< Last scaled horizontal luma/alpha line from source in the ring buffer.
352 …stInChrBuf;             ///< Last scaled horizontal chroma     line from source in the ring buffer.
355     uint8_t *formatConvBuffer;
356     int needAlpha;
372 …  int16_t *hLumFilter;          ///< Array of horizontal filter coefficients for luma/alpha planes.
373 …  int16_t *hChrFilter;          ///< Array of horizontal filter coefficients for chroma     planes.
374 …  int16_t *vLumFilter;          ///< Array of vertical   filter coefficients for luma/alpha planes.
375 …  int16_t *vChrFilter;          ///< Array of vertical   filter coefficients for chroma     planes.
376 …os;       ///< Array of horizontal filter starting positions for each dst[i] for luma/alpha planes.
377 …os;       ///< Array of horizontal filter starting positions for each dst[i] for chroma     planes.
378 …os;       ///< Array of vertical   filter starting positions for each dst[i] for luma/alpha planes.
379 …os;       ///< Array of vertical   filter starting positions for each dst[i] for chroma     planes.
380     int hLumFilterSize;           ///< Horizontal filter size for luma/alpha pixels.
381     int hChrFilterSize;           ///< Horizontal filter size for chroma     pixels.
382     int vLumFilterSize;           ///< Vertical   filter size for luma/alpha pixels.
383     int vChrFilterSize;           ///< Vertical   filter size for chroma     pixels.
386 …ze;  ///< Runtime-generated MMXEXT horizontal fast bilinear scaler code size for luma/alpha planes.
387 …deSize;  ///< Runtime-generated MMXEXT horizontal fast bilinear scaler code size for chroma planes.
388 …lterCode; ///< Runtime-generated MMXEXT horizontal fast bilinear scaler code for luma/alpha planes.
389 …xtFilterCode; ///< Runtime-generated MMXEXT horizontal fast bilinear scaler code for chroma planes.
391     int canMMXEXTBeUsed;
392     int warned_unuseable_bilinear;
394     int dstY;                     ///< Last destination vertical line output from last slice.
395 …       ///< Flags passed by the user to select scaler algorithm, optimizations, subsampling, etc...
396     void *yuvTable;             // pointer to the yuv->rgb table start so it can be freed()
399     DECLARE_ALIGNED(16, int, table_gV)[256 + 2*YUVRGB_TABLE_HEADROOM];
400     uint8_t *table_rV[256 + 2*YUVRGB_TABLE_HEADROOM];
401     uint8_t *table_gU[256 + 2*YUVRGB_TABLE_HEADROOM];
402     uint8_t *table_bU[256 + 2*YUVRGB_TABLE_HEADROOM];
403 …his table can contain both C and SIMD formatted values, the C vales are always at the XY_IDX points
415     int *dither_error[4];
418     int contrast, brightness, saturation;    // for sws_getColorspaceDetails
419     int srcColorspaceTable[4];
420     int dstColorspaceTable[4];
421     int srcRange;                 ///< 0 = MPG YUV range, 1 = JPG YUV range (source      image).
422     int dstRange;                 ///< 0 = MPG YUV range, 1 = JPG YUV range (destination image).
423     int src0Alpha;
424     int dst0Alpha;
425     int srcXYZ;
426     int dstXYZ;
427     int src_h_chr_pos;
428     int dst_h_chr_pos;
429     int src_v_chr_pos;
430     int dst_v_chr_pos;
431     int yuv2rgb_y_offset;
432     int yuv2rgb_y_coeff;
433     int yuv2rgb_v2r_coeff;
434     int yuv2rgb_v2g_coeff;
435     int yuv2rgb_u2g_coeff;
436     int yuv2rgb_u2b_coeff;
476     int32_t lumMmxFilter[4 * MAX_FILTER_SIZE];
477     int32_t chrMmxFilter[4 * MAX_FILTER_SIZE];
478     int dstW;                     ///< Width  of destination luma/alpha planes.
484     int32_t alpMmxFilter[4 * MAX_FILTER_SIZE];
490     DECLARE_ALIGNED(8, uint16_t, dither16)[8];
491     DECLARE_ALIGNED(8, uint32_t, dither32)[8];
493     const uint8_t *chrDither8, *lumDither8;
496     vector signed short   CY;
497     vector signed short   CRV;
498     vector signed short   CBU;
499     vector signed short   CGU;
500     vector signed short   CGV;
501     vector signed short   OY;
502     vector unsigned short CSHIFT;
503     vector signed short  *vYCoeffsBank, *vCCoeffsBank;
506     int use_mmx_vfilter;
511     int16_t *xyzgamma;
512     int16_t *rgbgamma;
513     int16_t *xyzgammainv;
514     int16_t *rgbgammainv;
515     int16_t xyz2rgb_matrix[3][4];
516     int16_t rgb2xyz_matrix[3][4];
519     yuv2planar1_fn yuv2plane1;
520     yuv2planarX_fn yuv2planeX;
521     yuv2interleavedX_fn yuv2nv12cX;
522     yuv2packed1_fn yuv2packed1;
523     yuv2packed2_fn yuv2packed2;
524     yuv2packedX_fn yuv2packedX;
525     yuv2anyX_fn yuv2anyX;
551      * to produce one line of output data. Compared to SwsContext->hScale(),  argument
568     void (*hyscale_fast)(struct SwsContext *c,  argument
571     void (*hcscale_fast)(struct SwsContext *c,  argument
608     void (*hyScale)(struct SwsContext *c, int16_t *dst, int dstW,  argument
611     void (*hcScale)(struct SwsContext *c, int16_t *dst, int dstW,  argument
626 } SwsContext;  argument