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- #define JPEG_INTERNALS
- #include "jinclude.h"
- #include "jpeglib.h"
- #include "jdct.h"
- #include "jsimddct.h"
- #include "jpegcomp.h"
- typedef struct {
- struct jpeg_inverse_dct pub;
-
- int cur_method[MAX_COMPONENTS];
- } my_idct_controller;
- typedef my_idct_controller *my_idct_ptr;
- typedef union {
- ISLOW_MULT_TYPE islow_array[DCTSIZE2];
- #ifdef DCT_IFAST_SUPPORTED
- IFAST_MULT_TYPE ifast_array[DCTSIZE2];
- #endif
- #ifdef DCT_FLOAT_SUPPORTED
- FLOAT_MULT_TYPE float_array[DCTSIZE2];
- #endif
- } multiplier_table;
- #ifdef DCT_ISLOW_SUPPORTED
- #define PROVIDE_ISLOW_TABLES
- #else
- #ifdef IDCT_SCALING_SUPPORTED
- #define PROVIDE_ISLOW_TABLES
- #endif
- #endif
- METHODDEF(void)
- start_pass(j_decompress_ptr cinfo)
- {
- my_idct_ptr idct = (my_idct_ptr)cinfo->idct;
- int ci, i;
- jpeg_component_info *compptr;
- int method = 0;
- inverse_DCT_method_ptr method_ptr = NULL;
- JQUANT_TBL *qtbl;
- for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
- ci++, compptr++) {
-
- switch (compptr->_DCT_scaled_size) {
- #ifdef IDCT_SCALING_SUPPORTED
- case 1:
- method_ptr = jpeg_idct_1x1;
- method = JDCT_ISLOW;
- break;
- case 2:
- if (jsimd_can_idct_2x2())
- method_ptr = jsimd_idct_2x2;
- else
- method_ptr = jpeg_idct_2x2;
- method = JDCT_ISLOW;
- break;
- case 3:
- method_ptr = jpeg_idct_3x3;
- method = JDCT_ISLOW;
- break;
- case 4:
- if (jsimd_can_idct_4x4())
- method_ptr = jsimd_idct_4x4;
- else
- method_ptr = jpeg_idct_4x4;
- method = JDCT_ISLOW;
- break;
- case 5:
- method_ptr = jpeg_idct_5x5;
- method = JDCT_ISLOW;
- break;
- case 6:
- #if defined(__mips__)
- if (jsimd_can_idct_6x6())
- method_ptr = jsimd_idct_6x6;
- else
- #endif
- method_ptr = jpeg_idct_6x6;
- method = JDCT_ISLOW;
- break;
- case 7:
- method_ptr = jpeg_idct_7x7;
- method = JDCT_ISLOW;
- break;
- #endif
- case DCTSIZE:
- switch (cinfo->dct_method) {
- #ifdef DCT_ISLOW_SUPPORTED
- case JDCT_ISLOW:
- if (jsimd_can_idct_islow())
- method_ptr = jsimd_idct_islow;
- else
- method_ptr = jpeg_idct_islow;
- method = JDCT_ISLOW;
- break;
- #endif
- #ifdef DCT_IFAST_SUPPORTED
- case JDCT_IFAST:
- if (jsimd_can_idct_ifast())
- method_ptr = jsimd_idct_ifast;
- else
- method_ptr = jpeg_idct_ifast;
- method = JDCT_IFAST;
- break;
- #endif
- #ifdef DCT_FLOAT_SUPPORTED
- case JDCT_FLOAT:
- if (jsimd_can_idct_float())
- method_ptr = jsimd_idct_float;
- else
- method_ptr = jpeg_idct_float;
- method = JDCT_FLOAT;
- break;
- #endif
- default:
- ERREXIT(cinfo, JERR_NOT_COMPILED);
- break;
- }
- break;
- #ifdef IDCT_SCALING_SUPPORTED
- case 9:
- method_ptr = jpeg_idct_9x9;
- method = JDCT_ISLOW;
- break;
- case 10:
- method_ptr = jpeg_idct_10x10;
- method = JDCT_ISLOW;
- break;
- case 11:
- method_ptr = jpeg_idct_11x11;
- method = JDCT_ISLOW;
- break;
- case 12:
- #if defined(__mips__)
- if (jsimd_can_idct_12x12())
- method_ptr = jsimd_idct_12x12;
- else
- #endif
- method_ptr = jpeg_idct_12x12;
- method = JDCT_ISLOW;
- break;
- case 13:
- method_ptr = jpeg_idct_13x13;
- method = JDCT_ISLOW;
- break;
- case 14:
- method_ptr = jpeg_idct_14x14;
- method = JDCT_ISLOW;
- break;
- case 15:
- method_ptr = jpeg_idct_15x15;
- method = JDCT_ISLOW;
- break;
- case 16:
- method_ptr = jpeg_idct_16x16;
- method = JDCT_ISLOW;
- break;
- #endif
- default:
- ERREXIT1(cinfo, JERR_BAD_DCTSIZE, compptr->_DCT_scaled_size);
- break;
- }
- idct->pub.inverse_DCT[ci] = method_ptr;
-
- if (!compptr->component_needed || idct->cur_method[ci] == method)
- continue;
- qtbl = compptr->quant_table;
- if (qtbl == NULL)
- continue;
- idct->cur_method[ci] = method;
- switch (method) {
- #ifdef PROVIDE_ISLOW_TABLES
- case JDCT_ISLOW:
- {
-
- ISLOW_MULT_TYPE *ismtbl = (ISLOW_MULT_TYPE *)compptr->dct_table;
- for (i = 0; i < DCTSIZE2; i++) {
- ismtbl[i] = (ISLOW_MULT_TYPE)qtbl->quantval[i];
- }
- }
- break;
- #endif
- #ifdef DCT_IFAST_SUPPORTED
- case JDCT_IFAST:
- {
-
- IFAST_MULT_TYPE *ifmtbl = (IFAST_MULT_TYPE *)compptr->dct_table;
- #define CONST_BITS 14
- static const INT16 aanscales[DCTSIZE2] = {
-
- 16384, 22725, 21407, 19266, 16384, 12873, 8867, 4520,
- 22725, 31521, 29692, 26722, 22725, 17855, 12299, 6270,
- 21407, 29692, 27969, 25172, 21407, 16819, 11585, 5906,
- 19266, 26722, 25172, 22654, 19266, 15137, 10426, 5315,
- 16384, 22725, 21407, 19266, 16384, 12873, 8867, 4520,
- 12873, 17855, 16819, 15137, 12873, 10114, 6967, 3552,
- 8867, 12299, 11585, 10426, 8867, 6967, 4799, 2446,
- 4520, 6270, 5906, 5315, 4520, 3552, 2446, 1247
- };
- SHIFT_TEMPS
- for (i = 0; i < DCTSIZE2; i++) {
- ifmtbl[i] = (IFAST_MULT_TYPE)
- DESCALE(MULTIPLY16V16((JLONG)qtbl->quantval[i],
- (JLONG)aanscales[i]),
- CONST_BITS - IFAST_SCALE_BITS);
- }
- }
- break;
- #endif
- #ifdef DCT_FLOAT_SUPPORTED
- case JDCT_FLOAT:
- {
-
- FLOAT_MULT_TYPE *fmtbl = (FLOAT_MULT_TYPE *)compptr->dct_table;
- int row, col;
- static const double aanscalefactor[DCTSIZE] = {
- 1.0, 1.387039845, 1.306562965, 1.175875602,
- 1.0, 0.785694958, 0.541196100, 0.275899379
- };
- i = 0;
- for (row = 0; row < DCTSIZE; row++) {
- for (col = 0; col < DCTSIZE; col++) {
- fmtbl[i] = (FLOAT_MULT_TYPE)
- ((double)qtbl->quantval[i] *
- aanscalefactor[row] * aanscalefactor[col]);
- i++;
- }
- }
- }
- break;
- #endif
- default:
- ERREXIT(cinfo, JERR_NOT_COMPILED);
- break;
- }
- }
- }
- GLOBAL(void)
- jinit_inverse_dct(j_decompress_ptr cinfo)
- {
- my_idct_ptr idct;
- int ci;
- jpeg_component_info *compptr;
- idct = (my_idct_ptr)
- (*cinfo->mem->alloc_small) ((j_common_ptr)cinfo, JPOOL_IMAGE,
- sizeof(my_idct_controller));
- cinfo->idct = (struct jpeg_inverse_dct *)idct;
- idct->pub.start_pass = start_pass;
- for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
- ci++, compptr++) {
-
- compptr->dct_table =
- (*cinfo->mem->alloc_small) ((j_common_ptr)cinfo, JPOOL_IMAGE,
- sizeof(multiplier_table));
- MEMZERO(compptr->dct_table, sizeof(multiplier_table));
-
- idct->cur_method[ci] = -1;
- }
- }
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