00071 {
00072   my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert;
00073   int i;
00074   INT32 x;
00075   SHIFT_TEMPS
00076 
00077   cconvert->Cr_r_tab = (int *)
00078     (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
00079                                 (MAXJSAMPLE+1) * SIZEOF(int));
00080   cconvert->Cb_b_tab = (int *)
00081     (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
00082                                 (MAXJSAMPLE+1) * SIZEOF(int));
00083   cconvert->Cr_g_tab = (INT32 *)
00084     (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
00085                                 (MAXJSAMPLE+1) * SIZEOF(INT32));
00086   cconvert->Cb_g_tab = (INT32 *)
00087     (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
00088                                 (MAXJSAMPLE+1) * SIZEOF(INT32));
00089 
00090   for (i = 0, x = -CENTERJSAMPLE; i <= MAXJSAMPLE; i++, x++) {
00091     /* i is the actual input pixel value, in the range 0..MAXJSAMPLE */
00092     /* The Cb or Cr value we are thinking of is x = i - CENTERJSAMPLE */
00093     /* Cr=>R value is nearest int to 1.40200 * x */
00094     cconvert->Cr_r_tab[i] = (int)
00095                     RIGHT_SHIFT(FIX(1.40200) * x + ONE_HALF, SCALEBITS);
00096     /* Cb=>B value is nearest int to 1.77200 * x */
00097     cconvert->Cb_b_tab[i] = (int)
00098                     RIGHT_SHIFT(FIX(1.77200) * x + ONE_HALF, SCALEBITS);
00099     /* Cr=>G value is scaled-up -0.71414 * x */
00100     cconvert->Cr_g_tab[i] = (- FIX(0.71414)) * x;
00101     /* Cb=>G value is scaled-up -0.34414 * x */
00102     /* We also add in ONE_HALF so that need not do it in inner loop */
00103     cconvert->Cb_g_tab[i] = (- FIX(0.34414)) * x + ONE_HALF;
00104   }
00105 }

00220 {
00221   register JSAMPROW inptr, outptr;
00222   register JDIMENSION col;
00223   JDIMENSION num_cols = cinfo->output_width;
00224 
00225   while (--num_rows >= 0) {
00226     inptr = input_buf[0][input_row++];
00227     outptr = *output_buf++;
00228     for (col = 0; col < num_cols; col++) {
00229       /* We can dispense with GETJSAMPLE() here */
00230       outptr[RGB_RED] = outptr[RGB_GREEN] = outptr[RGB_BLUE] = inptr[col];
00231       outptr += RGB_PIXELSIZE;
00232     }
00233   }
00234 }

00204 {
00205   jcopy_sample_rows(input_buf[0], (int) input_row, output_buf, 0,
00206                     num_rows, cinfo->output_width);
00207 }

00305 {
00306   my_cconvert_ptr cconvert;
00307   int ci;
00308 
00309   cconvert = (my_cconvert_ptr)
00310     (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
00311                                 SIZEOF(my_color_deconverter));
00312   cinfo->cconvert = (struct jpeg_color_deconverter *) cconvert;
00313   cconvert->pub.start_pass = start_pass_dcolor;
00314 
00315   /* Make sure num_components agrees with jpeg_color_space */
00316   switch (cinfo->jpeg_color_space) {
00317   case JCS_GRAYSCALE:
00318     if (cinfo->num_components != 1)
00319       ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
00320     break;
00321 
00322   case JCS_RGB:
00323   case JCS_YCbCr:
00324     if (cinfo->num_components != 3)
00325       ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
00326     break;
00327 
00328   case JCS_CMYK:
00329   case JCS_YCCK:
00330     if (cinfo->num_components != 4)
00331       ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
00332     break;
00333 
00334   default:                      /* JCS_UNKNOWN can be anything */
00335     if (cinfo->num_components < 1)
00336       ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
00337     break;
00338   }
00339 
00340   /* Set out_color_components and conversion method based on requested space.
00341    * Also clear the component_needed flags for any unused components,
00342    * so that earlier pipeline stages can avoid useless computation.
00343    */
00344 
00345   switch (cinfo->out_color_space) {
00346   case JCS_GRAYSCALE:
00347     cinfo->out_color_components = 1;
00348     if (cinfo->jpeg_color_space == JCS_GRAYSCALE ||
00349         cinfo->jpeg_color_space == JCS_YCbCr) {
00350       cconvert->pub.color_convert = grayscale_convert;
00351       /* For color->grayscale conversion, only the Y (0) component is needed */
00352       for (ci = 1; ci < cinfo->num_components; ci++)
00353         cinfo->comp_info[ci].component_needed = FALSE;
00354     } else
00355       ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
00356     break;
00357 
00358   case JCS_RGB:
00359     cinfo->out_color_components = RGB_PIXELSIZE;
00360     if (cinfo->jpeg_color_space == JCS_YCbCr) {
00361       cconvert->pub.color_convert = ycc_rgb_convert;
00362       build_ycc_rgb_table(cinfo);
00363     } else if (cinfo->jpeg_color_space == JCS_GRAYSCALE) {
00364       cconvert->pub.color_convert = gray_rgb_convert;
00365     } else if (cinfo->jpeg_color_space == JCS_RGB && RGB_PIXELSIZE == 3) {
00366       cconvert->pub.color_convert = null_convert;
00367     } else
00368       ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
00369     break;
00370 
00371   case JCS_CMYK:
00372     cinfo->out_color_components = 4;
00373     if (cinfo->jpeg_color_space == JCS_YCCK) {
00374       cconvert->pub.color_convert = ycck_cmyk_convert;
00375       build_ycc_rgb_table(cinfo);
00376     } else if (cinfo->jpeg_color_space == JCS_CMYK) {
00377       cconvert->pub.color_convert = null_convert;
00378     } else
00379       ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
00380     break;
00381 
00382   default:
00383     /* Permit null conversion to same output space */
00384     if (cinfo->out_color_space == cinfo->jpeg_color_space) {
00385       cinfo->out_color_components = cinfo->num_components;
00386       cconvert->pub.color_convert = null_convert;
00387     } else                      /* unsupported non-null conversion */
00388       ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
00389     break;
00390   }
00391 
00392   if (cinfo->quantize_colors)
00393     cinfo->output_components = 1; /* single colormapped output component */
00394   else
00395     cinfo->output_components = cinfo->out_color_components;
00396 }

00172 {
00173   register JSAMPROW inptr, outptr;
00174   register JDIMENSION count;
00175   register int num_components = cinfo->num_components;
00176   JDIMENSION num_cols = cinfo->output_width;
00177   int ci;
00178 
00179   while (--num_rows >= 0) {
00180     for (ci = 0; ci < num_components; ci++) {
00181       inptr = input_buf[ci][input_row];
00182       outptr = output_buf[0] + ci;
00183       for (count = num_cols; count > 0; count--) {
00184         *outptr = *inptr++;     /* needn't bother with GETJSAMPLE() here */
00185         outptr += num_components;
00186       }
00187     }
00188     input_row++;
00189     output_buf++;
00190   }
00191 }

00294 {
00295   /* no work needed */
00296 }

00123 {
00124   my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert;
00125   register int y, cb, cr;
00126   register JSAMPROW outptr;
00127   register JSAMPROW inptr0, inptr1, inptr2;
00128   register JDIMENSION col;
00129   JDIMENSION num_cols = cinfo->output_width;
00130   /* copy these pointers into registers if possible */
00131   register JSAMPLE * range_limit = cinfo->sample_range_limit;
00132   register int * Crrtab = cconvert->Cr_r_tab;
00133   register int * Cbbtab = cconvert->Cb_b_tab;
00134   register INT32 * Crgtab = cconvert->Cr_g_tab;
00135   register INT32 * Cbgtab = cconvert->Cb_g_tab;
00136   SHIFT_TEMPS
00137 
00138   while (--num_rows >= 0) {
00139     inptr0 = input_buf[0][input_row];
00140     inptr1 = input_buf[1][input_row];
00141     inptr2 = input_buf[2][input_row];
00142     input_row++;
00143     outptr = *output_buf++;
00144     for (col = 0; col < num_cols; col++) {
00145       y  = GETJSAMPLE(inptr0[col]);
00146       cb = GETJSAMPLE(inptr1[col]);
00147       cr = GETJSAMPLE(inptr2[col]);
00148       /* Range-limiting is essential due to noise introduced by DCT losses. */
00149       outptr[RGB_RED] =   range_limit[y + Crrtab[cr]];
00150       outptr[RGB_GREEN] = range_limit[y +
00151                               ((int) RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr],
00152                                                  SCALEBITS))];
00153       outptr[RGB_BLUE] =  range_limit[y + Cbbtab[cb]];
00154       outptr += RGB_PIXELSIZE;
00155     }
00156   }
00157 }

00248 {
00249   my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert;
00250   register int y, cb, cr;
00251   register JSAMPROW outptr;
00252   register JSAMPROW inptr0, inptr1, inptr2, inptr3;
00253   register JDIMENSION col;
00254   JDIMENSION num_cols = cinfo->output_width;
00255   /* copy these pointers into registers if possible */
00256   register JSAMPLE * range_limit = cinfo->sample_range_limit;
00257   register int * Crrtab = cconvert->Cr_r_tab;
00258   register int * Cbbtab = cconvert->Cb_b_tab;
00259   register INT32 * Crgtab = cconvert->Cr_g_tab;
00260   register INT32 * Cbgtab = cconvert->Cb_g_tab;
00261   SHIFT_TEMPS
00262 
00263   while (--num_rows >= 0) {
00264     inptr0 = input_buf[0][input_row];
00265     inptr1 = input_buf[1][input_row];
00266     inptr2 = input_buf[2][input_row];
00267     inptr3 = input_buf[3][input_row];
00268     input_row++;
00269     outptr = *output_buf++;
00270     for (col = 0; col < num_cols; col++) {
00271       y  = GETJSAMPLE(inptr0[col]);
00272       cb = GETJSAMPLE(inptr1[col]);
00273       cr = GETJSAMPLE(inptr2[col]);
00274       /* Range-limiting is essential due to noise introduced by DCT losses. */
00275       outptr[0] = range_limit[MAXJSAMPLE - (y + Crrtab[cr])];   /* red */
00276       outptr[1] = range_limit[MAXJSAMPLE - (y +                 /* green */
00277                               ((int) RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr],
00278                                                  SCALEBITS)))];
00279       outptr[2] = range_limit[MAXJSAMPLE - (y + Cbbtab[cb])];   /* blue */
00280       /* K passes through unchanged */
00281       outptr[3] = inptr3[col];  /* don't need GETJSAMPLE here */
00282       outptr += 4;
00283     }
00284   }
00285 }