Lines Matching defs:idct
10 * This code selects a particular IDCT implementation to be used,
12 * is executed per IDCT step, only during output pass setup.
14 * Note that the IDCT routines are responsible for performing coefficient
15 * dequantization as well as the IDCT proper. This module sets up the
16 * dequantization multiplier table needed by the IDCT routine.
31 * to a multiplier table that will actually be used by the IDCT routine.
32 * The multiplier table contents are IDCT-method-dependent. To support
33 * application changes in IDCT method between scans, we can remake the
38 * to zeroes; the result of the IDCT will be a neutral gray level.
47 /* This array contains the IDCT method code that each multiplier table
71 /* The current scaled-IDCT routines require ISLOW-style multiplier tables,
85 * Here we select the proper IDCT routine for each component and build
92 my_idct_ptr idct = (my_idct_ptr) cinfo->idct;
101 /* Select the proper IDCT routine for this component's scaling */
259 idct->pub.inverse_DCT[ci] = method_ptr;
267 if (! compptr->component_needed || idct->cur_method[ci] == method)
272 idct->cur_method[ci] = method;
277 /* For LL&M IDCT method, multipliers are equal to raw quantization
290 /* For AA&N IDCT method, multipliers are equal to quantization
324 /* For float AA&N IDCT method, multipliers are equal to quantization
358 * Initialize IDCT manager.
364 my_idct_ptr idct;
368 idct = (my_idct_ptr)
371 cinfo->idct = (struct jpeg_inverse_dct *) idct;
372 idct->pub.start_pass = start_pass;
382 idct->cur_method[ci] = -1;
