283 typedef struct SwsContext {  struct
287     const AVClass *av_class;
293     SwsFunc swscale;
294     int srcW;                     ///< Width  of source      luma/alpha planes.
295     int srcH;                     ///< Height of source      luma/alpha planes.
296     int dstH;                     ///< Height of destination luma/alpha planes.
320     struct SwsContext *cascaded_context[3];  argument
321     int cascaded_tmpStride[4];
322     uint8_t *cascaded_tmp[4];
323     int cascaded1_tmpStride[4];
324     uint8_t *cascaded1_tmp[4];
325     int cascaded_mainindex;
327     double gamma_value;
328     int gamma_flag;
329     int is_internal_gamma;
330     uint16_t *gamma;
331     uint16_t *inv_gamma;
333     int numDesc;
334     int descIndex[2];
335     int numSlice;
336     struct SwsSlice *slice;
337     struct SwsFilterDescriptor *desc;
339     uint32_t pal_yuv[256];
340     uint32_t pal_rgb[256];
342     float uint2float_lut[256];
354 …stInLumBuf;             ///< Last scaled horizontal luma/alpha line from source in the ring buffer.
355 …stInChrBuf;             ///< Last scaled horizontal chroma     line from source in the ring buffer.
358     uint8_t *formatConvBuffer;
359     int needAlpha;
375 …  int16_t *hLumFilter;          ///< Array of horizontal filter coefficients for luma/alpha planes.
376 …  int16_t *hChrFilter;          ///< Array of horizontal filter coefficients for chroma     planes.
377 …  int16_t *vLumFilter;          ///< Array of vertical   filter coefficients for luma/alpha planes.
378 …  int16_t *vChrFilter;          ///< Array of vertical   filter coefficients for chroma     planes.
379 …os;       ///< Array of horizontal filter starting positions for each dst[i] for luma/alpha planes.
380 …os;       ///< Array of horizontal filter starting positions for each dst[i] for chroma     planes.
381 …os;       ///< Array of vertical   filter starting positions for each dst[i] for luma/alpha planes.
382 …os;       ///< Array of vertical   filter starting positions for each dst[i] for chroma     planes.
383     int hLumFilterSize;           ///< Horizontal filter size for luma/alpha pixels.
384     int hChrFilterSize;           ///< Horizontal filter size for chroma     pixels.
385     int vLumFilterSize;           ///< Vertical   filter size for luma/alpha pixels.
386     int vChrFilterSize;           ///< Vertical   filter size for chroma     pixels.
389 …ze;  ///< Runtime-generated MMXEXT horizontal fast bilinear scaler code size for luma/alpha planes.
390 …deSize;  ///< Runtime-generated MMXEXT horizontal fast bilinear scaler code size for chroma planes.
391 …lterCode; ///< Runtime-generated MMXEXT horizontal fast bilinear scaler code for luma/alpha planes.
392 …xtFilterCode; ///< Runtime-generated MMXEXT horizontal fast bilinear scaler code for chroma planes.
394     int canMMXEXTBeUsed;
395     int warned_unuseable_bilinear;
397     int dstY;                     ///< Last destination vertical line output from last slice.
398 …       ///< Flags passed by the user to select scaler algorithm, optimizations, subsampling, etc...
399     void *yuvTable;             // pointer to the yuv->rgb table start so it can be freed()
402     DECLARE_ALIGNED(16, int, table_gV)[256 + 2*YUVRGB_TABLE_HEADROOM];
403     uint8_t *table_rV[256 + 2*YUVRGB_TABLE_HEADROOM];
404     uint8_t *table_gU[256 + 2*YUVRGB_TABLE_HEADROOM];
405     uint8_t *table_bU[256 + 2*YUVRGB_TABLE_HEADROOM];
406 …his table can contain both C and SIMD formatted values, the C vales are always at the XY_IDX points
418     int *dither_error[4];
421     int contrast, brightness, saturation;    // for sws_getColorspaceDetails
422     int srcColorspaceTable[4];
423     int dstColorspaceTable[4];
424     int srcRange;                 ///< 0 = MPG YUV range, 1 = JPG YUV range (source      image).
425     int dstRange;                 ///< 0 = MPG YUV range, 1 = JPG YUV range (destination image).
426     int src0Alpha;
427     int dst0Alpha;
428     int srcXYZ;
429     int dstXYZ;
430     int src_h_chr_pos;
431     int dst_h_chr_pos;
432     int src_v_chr_pos;
433     int dst_v_chr_pos;
434     int yuv2rgb_y_offset;
435     int yuv2rgb_y_coeff;
436     int yuv2rgb_v2r_coeff;
437     int yuv2rgb_v2g_coeff;
438     int yuv2rgb_u2g_coeff;
439     int yuv2rgb_u2b_coeff;
479     int32_t lumMmxFilter[4 * MAX_FILTER_SIZE];
480     int32_t chrMmxFilter[4 * MAX_FILTER_SIZE];
481     int dstW;                     ///< Width  of destination luma/alpha planes.
487     int32_t alpMmxFilter[4 * MAX_FILTER_SIZE];
493     DECLARE_ALIGNED(8, uint16_t, dither16)[8];
494     DECLARE_ALIGNED(8, uint32_t, dither32)[8];
496     const uint8_t *chrDither8, *lumDither8;
499     vector signed short   CY;
500     vector signed short   CRV;
501     vector signed short   CBU;
502     vector signed short   CGU;
503     vector signed short   CGV;
504     vector signed short   OY;
505     vector unsigned short CSHIFT;
506     vector signed short  *vYCoeffsBank, *vCCoeffsBank;
509     int use_mmx_vfilter;
514     int16_t *xyzgamma;
515     int16_t *rgbgamma;
516     int16_t *xyzgammainv;
517     int16_t *rgbgammainv;
518     int16_t xyz2rgb_matrix[3][4];
519     int16_t rgb2xyz_matrix[3][4];
522     yuv2planar1_fn yuv2plane1;
523     yuv2planarX_fn yuv2planeX;
524     yuv2interleavedX_fn yuv2nv12cX;
525     yuv2packed1_fn yuv2packed1;
526     yuv2packed2_fn yuv2packed2;
527     yuv2packedX_fn yuv2packedX;
528     yuv2anyX_fn yuv2anyX;
554      * to produce one line of output data. Compared to SwsContext->hScale(),  argument
571     void (*hyscale_fast)(struct SwsContext *c,  argument
574     void (*hcscale_fast)(struct SwsContext *c,  argument
611     void (*hyScale)(struct SwsContext *c, int16_t *dst, int dstW,  argument
614     void (*hcScale)(struct SwsContext *c, int16_t *dst, int dstW,  argument
629 } SwsContext;  argument