/*
* jidctvenum.c
*
* Copyright (c) 2010, Code Aurora Forum. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
* * Neither the name of Code Aurora Forum, Inc. nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#define JPEG_INTERNALS
#include "jinclude.h"
#include "jpeglib.h"
#include "jdct.h" /* Private declarations for DCT subsystem */
#ifdef ANDROID_JPEG_USE_VENUM
/*
* This module is specialized to the case DCTSIZE = 8.
*/
#if DCTSIZE != 8
Sorry, this code only copes with 8x8 DCTs. /* deliberate syntax err */
#endif
/* Dequantize a coefficient by multiplying it by the multiplier-table
* entry; produce an int result. In this module, both inputs and result
* are 16 bits or less, so either int or short multiply will work.
*/
#define DEQUANTIZE(coef,quantval) ((coef) * ((INT16)quantval))
GLOBAL(void)
jpeg_idct_islow (j_decompress_ptr cinfo, jpeg_component_info * compptr,
JCOEFPTR coef_block,
JSAMPARRAY output_buf, JDIMENSION output_col)
{
ISLOW_MULT_TYPE * quantptr;
JCOEFPTR coefptr;
int ctr;
/* idct_out temp buffer is needed because output_buf sample allocation is 8 bits,
* while IDCT output expects 16 bits.
*/
INT16 idct_out[DCTSIZE2]; /* buffers data between passes */
JSAMPROW outptr;
INT16* idctptr;
coefptr = coef_block;
quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table;
/* Dequantize the coeff buffer and write it back to the same location */
for (ctr = DCTSIZE; ctr > 0; ctr--) {
coefptr[0] = DEQUANTIZE(coefptr[0] , quantptr[0] );
coefptr[DCTSIZE*1] = DEQUANTIZE(coefptr[DCTSIZE*1], quantptr[DCTSIZE*1]);
coefptr[DCTSIZE*2] = DEQUANTIZE(coefptr[DCTSIZE*2], quantptr[DCTSIZE*2]);
coefptr[DCTSIZE*3] = DEQUANTIZE(coefptr[DCTSIZE*3], quantptr[DCTSIZE*3]);
coefptr[DCTSIZE*4] = DEQUANTIZE(coefptr[DCTSIZE*4], quantptr[DCTSIZE*4]);
coefptr[DCTSIZE*5] = DEQUANTIZE(coefptr[DCTSIZE*5], quantptr[DCTSIZE*5]);
coefptr[DCTSIZE*6] = DEQUANTIZE(coefptr[DCTSIZE*6], quantptr[DCTSIZE*6]);
coefptr[DCTSIZE*7] = DEQUANTIZE(coefptr[DCTSIZE*7], quantptr[DCTSIZE*7]);
/* advance pointers to next column */
quantptr++;
coefptr++;
}
idct_8x8_venum((INT16*)coef_block,
(INT16*)idct_out,
DCTSIZE * sizeof(INT16));
idctptr = idct_out;
for (ctr = 0; ctr < DCTSIZE; ctr++) {
outptr = output_buf[ctr] + output_col;
// outptr sample size is 1 byte while idctptr sample size is 2 bytes
outptr[0] = idctptr[0];
outptr[1] = idctptr[1];
outptr[2] = idctptr[2];
outptr[3] = idctptr[3];
outptr[4] = idctptr[4];
outptr[5] = idctptr[5];
outptr[6] = idctptr[6];
outptr[7] = idctptr[7];
idctptr += DCTSIZE; /* advance pointers to next row */
}
}
GLOBAL(void)
jpeg_idct_4x4 (j_decompress_ptr cinfo, jpeg_component_info * compptr,
JCOEFPTR coef_block,
JSAMPARRAY output_buf, JDIMENSION output_col)
{
ISLOW_MULT_TYPE * quantptr;
JSAMPROW outptr;
/* Note: Must allocate 8x4 even though only 4x4 is used because
* IDCT function expects stride of 8. Stride input to function is ignored.
*/
INT16 idct_out[DCTSIZE * (DCTSIZE>>1)]; /* buffers data between passes */
INT16* idctptr;
JCOEFPTR coefptr;
int ctr;
coefptr = coef_block;
quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table;
/* Dequantize the coeff buffer and write it back to the same location */
for (ctr = (DCTSIZE>>1); ctr > 0; ctr--) {
coefptr[0] = DEQUANTIZE(coefptr[0] , quantptr[0] );
coefptr[DCTSIZE*1] = DEQUANTIZE(coefptr[DCTSIZE*1], quantptr[DCTSIZE*1]);
coefptr[DCTSIZE*2] = DEQUANTIZE(coefptr[DCTSIZE*2], quantptr[DCTSIZE*2]);
coefptr[DCTSIZE*3] = DEQUANTIZE(coefptr[DCTSIZE*3], quantptr[DCTSIZE*3]);
/* advance pointers to next column */
quantptr++;
coefptr++;
}
idct_4x4_venum((INT16*)coef_block,
(INT16*)idct_out,
DCTSIZE * sizeof(INT16));
idctptr = idct_out;
for (ctr = 0; ctr < (DCTSIZE>>1); ctr++) {
outptr = output_buf[ctr] + output_col;
/* outptr sample size is 1 byte while idctptr sample size is 2 bytes */
outptr[0] = idctptr[0];
outptr[1] = idctptr[1];
outptr[2] = idctptr[2];
outptr[3] = idctptr[3];
/* IDCT function assumes stride of 8 units */
idctptr += (DCTSIZE); /* advance pointers to next row */
}
}
GLOBAL(void)
jpeg_idct_2x2 (j_decompress_ptr cinfo, jpeg_component_info * compptr,
JCOEFPTR coef_block,
JSAMPARRAY output_buf, JDIMENSION output_col)
{
ISLOW_MULT_TYPE * quantptr;
JSAMPROW outptr;
/* Note: Must allocate 8x2 even though only 2x2 is used because
* IDCT function expects stride of 8. Stride input to function is ignored.
* There is also a hw limitation requiring input size to be 8x2.
*/
INT16 idct_out[DCTSIZE * (DCTSIZE>>2)]; /* buffers data between passes */
INT16* idctptr;
JCOEFPTR coefptr;
int ctr;
coefptr = coef_block;
quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table;
/* Dequantize the coeff buffer and write it back to the same location */
for (ctr = (DCTSIZE>>2); ctr > 0; ctr--) {
coefptr[0] = DEQUANTIZE(coefptr[0] , quantptr[0] );
coefptr[DCTSIZE*1] = DEQUANTIZE(coefptr[DCTSIZE*1], quantptr[DCTSIZE*1]);
/* advance pointers to next column */
quantptr++;
coefptr++;
}
idct_2x2_venum((INT16*)coef_block,
(INT16*)idct_out,
DCTSIZE * sizeof(INT16));
idctptr = idct_out;
for (ctr = 0; ctr < (DCTSIZE>>2); ctr++) {
outptr = output_buf[ctr] + output_col;
/* outptr sample size is 1 bytes, idctptr sample size is 2 bytes */
outptr[0] = idctptr[0];
outptr[1] = idctptr[1];
/* IDCT function assumes stride of 8 units */
idctptr += (DCTSIZE); /* advance pointers to next row */
}
}
GLOBAL(void)
jpeg_idct_1x1 (j_decompress_ptr cinfo, jpeg_component_info * compptr,
JCOEFPTR coef_block,
JSAMPARRAY output_buf, JDIMENSION output_col)
{
ISLOW_MULT_TYPE * quantptr;
JSAMPROW outptr; // 8-bit type
INT16 idct_out[DCTSIZE]; /* Required to allocate 8 samples, even though we only use one. */
JCOEFPTR coefptr;
int ctr;
coefptr = coef_block;
quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table;
outptr = output_buf[0] + output_col;
/* Dequantize the coeff buffer and write it back to the same location */
coefptr[0] = DEQUANTIZE(coefptr[0], quantptr[0]);
idct_1x1_venum((INT16*)coef_block,
(INT16*)idct_out,
DCTSIZE * sizeof(INT16));
outptr[0] = idct_out[0];
}
#endif /* ANDROID_JPEG_USE_VENUM */
