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