michael@0: /*
michael@0:  * jdmrgext.c
michael@0:  *
michael@0:  * This file was part of the Independent JPEG Group's software:
michael@0:  * Copyright (C) 1994-1996, Thomas G. Lane.
michael@0:  * libjpeg-turbo Modifications:
michael@0:  * Copyright (C) 2011, D. R. Commander.
michael@0:  * For conditions of distribution and use, see the accompanying README file.
michael@0:  *
michael@0:  * This file contains code for merged upsampling/color conversion.
michael@0:  */
michael@0: 
michael@0: 
michael@0: /* This file is included by jdmerge.c */
michael@0: 
michael@0: 
michael@0: /*
michael@0:  * Upsample and color convert for the case of 2:1 horizontal and 1:1 vertical.
michael@0:  */
michael@0: 
michael@0: INLINE
michael@0: LOCAL(void)
michael@0: h2v1_merged_upsample_internal (j_decompress_ptr cinfo,
michael@0:                                JSAMPIMAGE input_buf,
michael@0:                                JDIMENSION in_row_group_ctr,
michael@0:                                JSAMPARRAY output_buf)
michael@0: {
michael@0:   my_upsample_ptr upsample = (my_upsample_ptr) cinfo->upsample;
michael@0:   register int y, cred, cgreen, cblue;
michael@0:   int cb, cr;
michael@0:   register JSAMPROW outptr;
michael@0:   JSAMPROW inptr0, inptr1, inptr2;
michael@0:   JDIMENSION col;
michael@0:   /* copy these pointers into registers if possible */
michael@0:   register JSAMPLE * range_limit = cinfo->sample_range_limit;
michael@0:   int * Crrtab = upsample->Cr_r_tab;
michael@0:   int * Cbbtab = upsample->Cb_b_tab;
michael@0:   INT32 * Crgtab = upsample->Cr_g_tab;
michael@0:   INT32 * Cbgtab = upsample->Cb_g_tab;
michael@0:   SHIFT_TEMPS
michael@0: 
michael@0:   inptr0 = input_buf[0][in_row_group_ctr];
michael@0:   inptr1 = input_buf[1][in_row_group_ctr];
michael@0:   inptr2 = input_buf[2][in_row_group_ctr];
michael@0:   outptr = output_buf[0];
michael@0:   /* Loop for each pair of output pixels */
michael@0:   for (col = cinfo->output_width >> 1; col > 0; col--) {
michael@0:     /* Do the chroma part of the calculation */
michael@0:     cb = GETJSAMPLE(*inptr1++);
michael@0:     cr = GETJSAMPLE(*inptr2++);
michael@0:     cred = Crrtab[cr];
michael@0:     cgreen = (int) RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], SCALEBITS);
michael@0:     cblue = Cbbtab[cb];
michael@0:     /* Fetch 2 Y values and emit 2 pixels */
michael@0:     y  = GETJSAMPLE(*inptr0++);
michael@0:     outptr[RGB_RED] =   range_limit[y + cred];
michael@0:     outptr[RGB_GREEN] = range_limit[y + cgreen];
michael@0:     outptr[RGB_BLUE] =  range_limit[y + cblue];
michael@0: #ifdef RGB_ALPHA
michael@0:     outptr[RGB_ALPHA] = 0xFF;
michael@0: #endif
michael@0:     outptr += RGB_PIXELSIZE;
michael@0:     y  = GETJSAMPLE(*inptr0++);
michael@0:     outptr[RGB_RED] =   range_limit[y + cred];
michael@0:     outptr[RGB_GREEN] = range_limit[y + cgreen];
michael@0:     outptr[RGB_BLUE] =  range_limit[y + cblue];
michael@0: #ifdef RGB_ALPHA
michael@0:     outptr[RGB_ALPHA] = 0xFF;
michael@0: #endif
michael@0:     outptr += RGB_PIXELSIZE;
michael@0:   }
michael@0:   /* If image width is odd, do the last output column separately */
michael@0:   if (cinfo->output_width & 1) {
michael@0:     cb = GETJSAMPLE(*inptr1);
michael@0:     cr = GETJSAMPLE(*inptr2);
michael@0:     cred = Crrtab[cr];
michael@0:     cgreen = (int) RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], SCALEBITS);
michael@0:     cblue = Cbbtab[cb];
michael@0:     y  = GETJSAMPLE(*inptr0);
michael@0:     outptr[RGB_RED] =   range_limit[y + cred];
michael@0:     outptr[RGB_GREEN] = range_limit[y + cgreen];
michael@0:     outptr[RGB_BLUE] =  range_limit[y + cblue];
michael@0: #ifdef RGB_ALPHA
michael@0:     outptr[RGB_ALPHA] = 0xFF;
michael@0: #endif
michael@0:   }
michael@0: }
michael@0: 
michael@0: 
michael@0: /*
michael@0:  * Upsample and color convert for the case of 2:1 horizontal and 2:1 vertical.
michael@0:  */
michael@0: 
michael@0: INLINE
michael@0: LOCAL(void)
michael@0: h2v2_merged_upsample_internal (j_decompress_ptr cinfo,
michael@0:                                JSAMPIMAGE input_buf,
michael@0:                                JDIMENSION in_row_group_ctr,
michael@0:                                JSAMPARRAY output_buf)
michael@0: {
michael@0:   my_upsample_ptr upsample = (my_upsample_ptr) cinfo->upsample;
michael@0:   register int y, cred, cgreen, cblue;
michael@0:   int cb, cr;
michael@0:   register JSAMPROW outptr0, outptr1;
michael@0:   JSAMPROW inptr00, inptr01, inptr1, inptr2;
michael@0:   JDIMENSION col;
michael@0:   /* copy these pointers into registers if possible */
michael@0:   register JSAMPLE * range_limit = cinfo->sample_range_limit;
michael@0:   int * Crrtab = upsample->Cr_r_tab;
michael@0:   int * Cbbtab = upsample->Cb_b_tab;
michael@0:   INT32 * Crgtab = upsample->Cr_g_tab;
michael@0:   INT32 * Cbgtab = upsample->Cb_g_tab;
michael@0:   SHIFT_TEMPS
michael@0: 
michael@0:   inptr00 = input_buf[0][in_row_group_ctr*2];
michael@0:   inptr01 = input_buf[0][in_row_group_ctr*2 + 1];
michael@0:   inptr1 = input_buf[1][in_row_group_ctr];
michael@0:   inptr2 = input_buf[2][in_row_group_ctr];
michael@0:   outptr0 = output_buf[0];
michael@0:   outptr1 = output_buf[1];
michael@0:   /* Loop for each group of output pixels */
michael@0:   for (col = cinfo->output_width >> 1; col > 0; col--) {
michael@0:     /* Do the chroma part of the calculation */
michael@0:     cb = GETJSAMPLE(*inptr1++);
michael@0:     cr = GETJSAMPLE(*inptr2++);
michael@0:     cred = Crrtab[cr];
michael@0:     cgreen = (int) RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], SCALEBITS);
michael@0:     cblue = Cbbtab[cb];
michael@0:     /* Fetch 4 Y values and emit 4 pixels */
michael@0:     y  = GETJSAMPLE(*inptr00++);
michael@0:     outptr0[RGB_RED] =   range_limit[y + cred];
michael@0:     outptr0[RGB_GREEN] = range_limit[y + cgreen];
michael@0:     outptr0[RGB_BLUE] =  range_limit[y + cblue];
michael@0: #ifdef RGB_ALPHA
michael@0:     outptr0[RGB_ALPHA] = 0xFF;
michael@0: #endif
michael@0:     outptr0 += RGB_PIXELSIZE;
michael@0:     y  = GETJSAMPLE(*inptr00++);
michael@0:     outptr0[RGB_RED] =   range_limit[y + cred];
michael@0:     outptr0[RGB_GREEN] = range_limit[y + cgreen];
michael@0:     outptr0[RGB_BLUE] =  range_limit[y + cblue];
michael@0: #ifdef RGB_ALPHA
michael@0:     outptr0[RGB_ALPHA] = 0xFF;
michael@0: #endif
michael@0:     outptr0 += RGB_PIXELSIZE;
michael@0:     y  = GETJSAMPLE(*inptr01++);
michael@0:     outptr1[RGB_RED] =   range_limit[y + cred];
michael@0:     outptr1[RGB_GREEN] = range_limit[y + cgreen];
michael@0:     outptr1[RGB_BLUE] =  range_limit[y + cblue];
michael@0: #ifdef RGB_ALPHA
michael@0:     outptr1[RGB_ALPHA] = 0xFF;
michael@0: #endif
michael@0:     outptr1 += RGB_PIXELSIZE;
michael@0:     y  = GETJSAMPLE(*inptr01++);
michael@0:     outptr1[RGB_RED] =   range_limit[y + cred];
michael@0:     outptr1[RGB_GREEN] = range_limit[y + cgreen];
michael@0:     outptr1[RGB_BLUE] =  range_limit[y + cblue];
michael@0: #ifdef RGB_ALPHA
michael@0:     outptr1[RGB_ALPHA] = 0xFF;
michael@0: #endif
michael@0:     outptr1 += RGB_PIXELSIZE;
michael@0:   }
michael@0:   /* If image width is odd, do the last output column separately */
michael@0:   if (cinfo->output_width & 1) {
michael@0:     cb = GETJSAMPLE(*inptr1);
michael@0:     cr = GETJSAMPLE(*inptr2);
michael@0:     cred = Crrtab[cr];
michael@0:     cgreen = (int) RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], SCALEBITS);
michael@0:     cblue = Cbbtab[cb];
michael@0:     y  = GETJSAMPLE(*inptr00);
michael@0:     outptr0[RGB_RED] =   range_limit[y + cred];
michael@0:     outptr0[RGB_GREEN] = range_limit[y + cgreen];
michael@0:     outptr0[RGB_BLUE] =  range_limit[y + cblue];
michael@0: #ifdef RGB_ALPHA
michael@0:     outptr0[RGB_ALPHA] = 0xFF;
michael@0: #endif
michael@0:     y  = GETJSAMPLE(*inptr01);
michael@0:     outptr1[RGB_RED] =   range_limit[y + cred];
michael@0:     outptr1[RGB_GREEN] = range_limit[y + cgreen];
michael@0:     outptr1[RGB_BLUE] =  range_limit[y + cblue];
michael@0: #ifdef RGB_ALPHA
michael@0:     outptr1[RGB_ALPHA] = 0xFF;
michael@0: #endif
michael@0:   }
michael@0: }