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- #define JPEG_INTERNALS
- #include "jinclude.h"
- #include "jpeglib.h"
- #include "jdct.h"
- #ifdef IDCT_SCALING_SUPPORTED
- #if DCTSIZE != 8
- Sorry, this code only copes with 8 x8 DCTs.
- #endif
- #if BITS_IN_JSAMPLE == 8
- #define CONST_BITS 13
- #define PASS1_BITS 2
- #else
- #define CONST_BITS 13
- #define PASS1_BITS 1
- #endif
- #if CONST_BITS == 13
- #define FIX_0_211164243 ( (INT32) 1730 )
- #define FIX_0_509795579 ( (INT32) 4176 )
- #define FIX_0_601344887 ( (INT32) 4926 )
- #define FIX_0_720959822 ( (INT32) 5906 )
- #define FIX_0_765366865 ( (INT32) 6270 )
- #define FIX_0_850430095 ( (INT32) 6967 )
- #define FIX_0_899976223 ( (INT32) 7373 )
- #define FIX_1_061594337 ( (INT32) 8697 )
- #define FIX_1_272758580 ( (INT32) 10426 )
- #define FIX_1_451774981 ( (INT32) 11893 )
- #define FIX_1_847759065 ( (INT32) 15137 )
- #define FIX_2_172734803 ( (INT32) 17799 )
- #define FIX_2_562915447 ( (INT32) 20995 )
- #define FIX_3_624509785 ( (INT32) 29692 )
- #else
- #define FIX_0_211164243 FIX( 0.211164243 )
- #define FIX_0_509795579 FIX( 0.509795579 )
- #define FIX_0_601344887 FIX( 0.601344887 )
- #define FIX_0_720959822 FIX( 0.720959822 )
- #define FIX_0_765366865 FIX( 0.765366865 )
- #define FIX_0_850430095 FIX( 0.850430095 )
- #define FIX_0_899976223 FIX( 0.899976223 )
- #define FIX_1_061594337 FIX( 1.061594337 )
- #define FIX_1_272758580 FIX( 1.272758580 )
- #define FIX_1_451774981 FIX( 1.451774981 )
- #define FIX_1_847759065 FIX( 1.847759065 )
- #define FIX_2_172734803 FIX( 2.172734803 )
- #define FIX_2_562915447 FIX( 2.562915447 )
- #define FIX_3_624509785 FIX( 3.624509785 )
- #endif
- #if BITS_IN_JSAMPLE == 8
- #define MULTIPLY( var, const ) MULTIPLY16C16( var, const )
- #else
- #define MULTIPLY( var, const ) ( ( var ) * ( const ) )
- #endif
- #define DEQUANTIZE( coef, quantval ) ( ( (ISLOW_MULT_TYPE) ( coef ) ) * ( quantval ) )
- GLOBAL void
- jpeg_idct_4x4( j_decompress_ptr cinfo, jpeg_component_info * compptr,
- JCOEFPTR coef_block,
- JSAMPARRAY output_buf, JDIMENSION output_col ) {
- INT32 tmp0, tmp2, tmp10, tmp12;
- INT32 z1, z2, z3, z4;
- JCOEFPTR inptr;
- ISLOW_MULT_TYPE * quantptr;
- int * wsptr;
- JSAMPROW outptr;
- JSAMPLE * range_limit = IDCT_range_limit( cinfo );
- int ctr;
- int workspace[DCTSIZE * 4];
- SHIFT_TEMPS
-
- inptr = coef_block;
- quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table;
- wsptr = workspace;
- for ( ctr = DCTSIZE; ctr > 0; inptr++, quantptr++, wsptr++, ctr-- ) {
-
- if ( ctr == DCTSIZE - 4 ) {
- continue;
- }
- if ( ( inptr[DCTSIZE * 1] | inptr[DCTSIZE * 2] | inptr[DCTSIZE * 3] |
- inptr[DCTSIZE * 5] | inptr[DCTSIZE * 6] | inptr[DCTSIZE * 7] ) == 0 ) {
-
- int dcval = DEQUANTIZE( inptr[DCTSIZE * 0], quantptr[DCTSIZE * 0] ) << PASS1_BITS;
- wsptr[DCTSIZE * 0] = dcval;
- wsptr[DCTSIZE * 1] = dcval;
- wsptr[DCTSIZE * 2] = dcval;
- wsptr[DCTSIZE * 3] = dcval;
- continue;
- }
-
- tmp0 = DEQUANTIZE( inptr[DCTSIZE * 0], quantptr[DCTSIZE * 0] );
- tmp0 <<= ( CONST_BITS + 1 );
- z2 = DEQUANTIZE( inptr[DCTSIZE * 2], quantptr[DCTSIZE * 2] );
- z3 = DEQUANTIZE( inptr[DCTSIZE * 6], quantptr[DCTSIZE * 6] );
- tmp2 = MULTIPLY( z2, FIX_1_847759065 ) + MULTIPLY( z3, -FIX_0_765366865 );
- tmp10 = tmp0 + tmp2;
- tmp12 = tmp0 - tmp2;
-
- z1 = DEQUANTIZE( inptr[DCTSIZE * 7], quantptr[DCTSIZE * 7] );
- z2 = DEQUANTIZE( inptr[DCTSIZE * 5], quantptr[DCTSIZE * 5] );
- z3 = DEQUANTIZE( inptr[DCTSIZE * 3], quantptr[DCTSIZE * 3] );
- z4 = DEQUANTIZE( inptr[DCTSIZE * 1], quantptr[DCTSIZE * 1] );
- tmp0 = MULTIPLY( z1, -FIX_0_211164243 )
- + MULTIPLY( z2, FIX_1_451774981 )
- + MULTIPLY( z3, -FIX_2_172734803 )
- + MULTIPLY( z4, FIX_1_061594337 );
- tmp2 = MULTIPLY( z1, -FIX_0_509795579 )
- + MULTIPLY( z2, -FIX_0_601344887 )
- + MULTIPLY( z3, FIX_0_899976223 )
- + MULTIPLY( z4, FIX_2_562915447 );
-
- wsptr[DCTSIZE * 0] = (int) DESCALE( tmp10 + tmp2, CONST_BITS - PASS1_BITS + 1 );
- wsptr[DCTSIZE * 3] = (int) DESCALE( tmp10 - tmp2, CONST_BITS - PASS1_BITS + 1 );
- wsptr[DCTSIZE * 1] = (int) DESCALE( tmp12 + tmp0, CONST_BITS - PASS1_BITS + 1 );
- wsptr[DCTSIZE * 2] = (int) DESCALE( tmp12 - tmp0, CONST_BITS - PASS1_BITS + 1 );
- }
-
- wsptr = workspace;
- for ( ctr = 0; ctr < 4; ctr++ ) {
- outptr = output_buf[ctr] + output_col;
-
- #ifndef NO_ZERO_ROW_TEST
- if ( ( wsptr[1] | wsptr[2] | wsptr[3] | wsptr[5] | wsptr[6] |
- wsptr[7] ) == 0 ) {
-
- JSAMPLE dcval = range_limit[(int) DESCALE( (INT32) wsptr[0], PASS1_BITS + 3 )
- & RANGE_MASK];
- outptr[0] = dcval;
- outptr[1] = dcval;
- outptr[2] = dcval;
- outptr[3] = dcval;
- wsptr += DCTSIZE;
- continue;
- }
- #endif
-
- tmp0 = ( (INT32) wsptr[0] ) << ( CONST_BITS + 1 );
- tmp2 = MULTIPLY( (INT32) wsptr[2], FIX_1_847759065 )
- + MULTIPLY( (INT32) wsptr[6], -FIX_0_765366865 );
- tmp10 = tmp0 + tmp2;
- tmp12 = tmp0 - tmp2;
-
- z1 = (INT32) wsptr[7];
- z2 = (INT32) wsptr[5];
- z3 = (INT32) wsptr[3];
- z4 = (INT32) wsptr[1];
- tmp0 = MULTIPLY( z1, -FIX_0_211164243 )
- + MULTIPLY( z2, FIX_1_451774981 )
- + MULTIPLY( z3, -FIX_2_172734803 )
- + MULTIPLY( z4, FIX_1_061594337 );
- tmp2 = MULTIPLY( z1, -FIX_0_509795579 )
- + MULTIPLY( z2, -FIX_0_601344887 )
- + MULTIPLY( z3, FIX_0_899976223 )
- + MULTIPLY( z4, FIX_2_562915447 );
-
- outptr[0] = range_limit[(int) DESCALE( tmp10 + tmp2,
- CONST_BITS + PASS1_BITS + 3 + 1 )
- & RANGE_MASK];
- outptr[3] = range_limit[(int) DESCALE( tmp10 - tmp2,
- CONST_BITS + PASS1_BITS + 3 + 1 )
- & RANGE_MASK];
- outptr[1] = range_limit[(int) DESCALE( tmp12 + tmp0,
- CONST_BITS + PASS1_BITS + 3 + 1 )
- & RANGE_MASK];
- outptr[2] = range_limit[(int) DESCALE( tmp12 - tmp0,
- CONST_BITS + PASS1_BITS + 3 + 1 )
- & RANGE_MASK];
- wsptr += DCTSIZE;
- }
- }
- GLOBAL void
- jpeg_idct_2x2( j_decompress_ptr cinfo, jpeg_component_info * compptr,
- JCOEFPTR coef_block,
- JSAMPARRAY output_buf, JDIMENSION output_col ) {
- INT32 tmp0, tmp10, z1;
- JCOEFPTR inptr;
- ISLOW_MULT_TYPE * quantptr;
- int * wsptr;
- JSAMPROW outptr;
- JSAMPLE * range_limit = IDCT_range_limit( cinfo );
- int ctr;
- int workspace[DCTSIZE * 2];
- SHIFT_TEMPS
-
- inptr = coef_block;
- quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table;
- wsptr = workspace;
- for ( ctr = DCTSIZE; ctr > 0; inptr++, quantptr++, wsptr++, ctr-- ) {
-
- if ( ( ctr == DCTSIZE - 2 ) || ( ctr == DCTSIZE - 4 ) || ( ctr == DCTSIZE - 6 ) ) {
- continue;
- }
- if ( ( inptr[DCTSIZE * 1] | inptr[DCTSIZE * 3] |
- inptr[DCTSIZE * 5] | inptr[DCTSIZE * 7] ) == 0 ) {
-
- int dcval = DEQUANTIZE( inptr[DCTSIZE * 0], quantptr[DCTSIZE * 0] ) << PASS1_BITS;
- wsptr[DCTSIZE * 0] = dcval;
- wsptr[DCTSIZE * 1] = dcval;
- continue;
- }
-
- z1 = DEQUANTIZE( inptr[DCTSIZE * 0], quantptr[DCTSIZE * 0] );
- tmp10 = z1 << ( CONST_BITS + 2 );
-
- z1 = DEQUANTIZE( inptr[DCTSIZE * 7], quantptr[DCTSIZE * 7] );
- tmp0 = MULTIPLY( z1, -FIX_0_720959822 );
- z1 = DEQUANTIZE( inptr[DCTSIZE * 5], quantptr[DCTSIZE * 5] );
- tmp0 += MULTIPLY( z1, FIX_0_850430095 );
- z1 = DEQUANTIZE( inptr[DCTSIZE * 3], quantptr[DCTSIZE * 3] );
- tmp0 += MULTIPLY( z1, -FIX_1_272758580 );
- z1 = DEQUANTIZE( inptr[DCTSIZE * 1], quantptr[DCTSIZE * 1] );
- tmp0 += MULTIPLY( z1, FIX_3_624509785 );
-
- wsptr[DCTSIZE * 0] = (int) DESCALE( tmp10 + tmp0, CONST_BITS - PASS1_BITS + 2 );
- wsptr[DCTSIZE * 1] = (int) DESCALE( tmp10 - tmp0, CONST_BITS - PASS1_BITS + 2 );
- }
-
- wsptr = workspace;
- for ( ctr = 0; ctr < 2; ctr++ ) {
- outptr = output_buf[ctr] + output_col;
-
- #ifndef NO_ZERO_ROW_TEST
- if ( ( wsptr[1] | wsptr[3] | wsptr[5] | wsptr[7] ) == 0 ) {
-
- JSAMPLE dcval = range_limit[(int) DESCALE( (INT32) wsptr[0], PASS1_BITS + 3 )
- & RANGE_MASK];
- outptr[0] = dcval;
- outptr[1] = dcval;
- wsptr += DCTSIZE;
- continue;
- }
- #endif
-
- tmp10 = ( (INT32) wsptr[0] ) << ( CONST_BITS + 2 );
-
- tmp0 = MULTIPLY( (INT32) wsptr[7], -FIX_0_720959822 )
- + MULTIPLY( (INT32) wsptr[5], FIX_0_850430095 )
- + MULTIPLY( (INT32) wsptr[3], -FIX_1_272758580 )
- + MULTIPLY( (INT32) wsptr[1], FIX_3_624509785 );
-
- outptr[0] = range_limit[(int) DESCALE( tmp10 + tmp0,
- CONST_BITS + PASS1_BITS + 3 + 2 )
- & RANGE_MASK];
- outptr[1] = range_limit[(int) DESCALE( tmp10 - tmp0,
- CONST_BITS + PASS1_BITS + 3 + 2 )
- & RANGE_MASK];
- wsptr += DCTSIZE;
- }
- }
- GLOBAL void
- jpeg_idct_1x1( j_decompress_ptr cinfo, jpeg_component_info * compptr,
- JCOEFPTR coef_block,
- JSAMPARRAY output_buf, JDIMENSION output_col ) {
- int dcval;
- ISLOW_MULT_TYPE * quantptr;
- JSAMPLE * range_limit = IDCT_range_limit( cinfo );
- SHIFT_TEMPS
-
- quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table;
- dcval = DEQUANTIZE( coef_block[0], quantptr[0] );
- dcval = (int) DESCALE( (INT32) dcval, 3 );
- output_buf[0][output_col] = range_limit[dcval & RANGE_MASK];
- }
- #endif
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