48 lines
1.6 KiB
C
48 lines
1.6 KiB
C
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/*
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* jdmerge.h
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*
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* This file was part of the Independent JPEG Group's software:
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* Copyright (C) 1994-1996, Thomas G. Lane.
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* libjpeg-turbo Modifications:
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* Copyright (C) 2020, D. R. Commander.
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* For conditions of distribution and use, see the accompanying README.ijg
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* file.
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*/
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#define JPEG_INTERNALS
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#include "jpeglib.h"
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#ifdef UPSAMPLE_MERGING_SUPPORTED
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/* Private subobject */
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typedef struct {
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struct jpeg_upsampler pub; /* public fields */
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/* Pointer to routine to do actual upsampling/conversion of one row group */
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void (*upmethod) (j_decompress_ptr cinfo, JSAMPIMAGE input_buf,
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JDIMENSION in_row_group_ctr, JSAMPARRAY output_buf);
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/* Private state for YCC->RGB conversion */
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int *Cr_r_tab; /* => table for Cr to R conversion */
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int *Cb_b_tab; /* => table for Cb to B conversion */
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JLONG *Cr_g_tab; /* => table for Cr to G conversion */
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JLONG *Cb_g_tab; /* => table for Cb to G conversion */
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/* For 2:1 vertical sampling, we produce two output rows at a time.
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* We need a "spare" row buffer to hold the second output row if the
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* application provides just a one-row buffer; we also use the spare
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* to discard the dummy last row if the image height is odd.
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*/
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JSAMPROW spare_row;
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boolean spare_full; /* T if spare buffer is occupied */
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JDIMENSION out_row_width; /* samples per output row */
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JDIMENSION rows_to_go; /* counts rows remaining in image */
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} my_merged_upsampler;
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typedef my_merged_upsampler *my_merged_upsample_ptr;
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#endif /* UPSAMPLE_MERGING_SUPPORTED */
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