00251 {
00252   my_post_ptr post;
00253 
00254   post = (my_post_ptr)
00255     (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
00256                                 SIZEOF(my_post_controller));
00257   cinfo->post = (struct jpeg_d_post_controller *) post;
00258   post->pub.start_pass = start_pass_dpost;
00259   post->whole_image = NULL;     /* flag for no virtual arrays */
00260   post->buffer = NULL;          /* flag for no strip buffer */
00261 
00262   /* Create the quantization buffer, if needed */
00263   if (cinfo->quantize_colors) {
00264     /* The buffer strip height is max_v_samp_factor, which is typically
00265      * an efficient number of rows for upsampling to return.
00266      * (In the presence of output rescaling, we might want to be smarter?)
00267      */
00268     post->strip_height = (JDIMENSION) cinfo->max_v_samp_factor;
00269     if (need_full_buffer) {
00270       /* Two-pass color quantization: need full-image storage. */
00271       /* We round up the number of rows to a multiple of the strip height. */
00272 #ifdef QUANT_2PASS_SUPPORTED
00273       post->whole_image = (*cinfo->mem->request_virt_sarray)
00274         ((j_common_ptr) cinfo, JPOOL_IMAGE, FALSE,
00275          cinfo->output_width * cinfo->out_color_components,
00276          (JDIMENSION) jround_up((long) cinfo->output_height,
00277                                 (long) post->strip_height),
00278          post->strip_height);
00279 #else
00280       ERREXIT(cinfo, JERR_BAD_BUFFER_MODE);
00281 #endif /* QUANT_2PASS_SUPPORTED */
00282     } else {
00283       /* One-pass color quantization: just make a strip buffer. */
00284       post->buffer = (*cinfo->mem->alloc_sarray)
00285         ((j_common_ptr) cinfo, JPOOL_IMAGE,
00286          cinfo->output_width * cinfo->out_color_components,
00287          post->strip_height);
00288     }
00289   }
00290 }

00131 {
00132   my_post_ptr post = (my_post_ptr) cinfo->post;
00133   JDIMENSION num_rows, max_rows;
00134 
00135   /* Fill the buffer, but not more than what we can dump out in one go. */
00136   /* Note we rely on the upsampler to detect bottom of image. */
00137   max_rows = out_rows_avail - *out_row_ctr;
00138   if (max_rows > post->strip_height)
00139     max_rows = post->strip_height;
00140   num_rows = 0;
00141   (*cinfo->upsample->upsample) (cinfo,
00142                 input_buf, in_row_group_ctr, in_row_groups_avail,
00143                 post->buffer, &num_rows, max_rows);
00144   /* Quantize and emit data. */
00145   (*cinfo->cquantize->color_quantize) (cinfo,
00146                 post->buffer, output_buf + *out_row_ctr, (int) num_rows);
00147   *out_row_ctr += num_rows;
00148 }

00207 {
00208   my_post_ptr post = (my_post_ptr) cinfo->post;
00209   JDIMENSION num_rows, max_rows;
00210 
00211   /* Reposition virtual buffer if at start of strip. */
00212   if (post->next_row == 0) {
00213     post->buffer = (*cinfo->mem->access_virt_sarray)
00214         ((j_common_ptr) cinfo, post->whole_image,
00215          post->starting_row, post->strip_height, FALSE);
00216   }
00217 
00218   /* Determine number of rows to emit. */
00219   num_rows = post->strip_height - post->next_row; /* available in strip */
00220   max_rows = out_rows_avail - *out_row_ctr; /* available in output area */
00221   if (num_rows > max_rows)
00222     num_rows = max_rows;
00223   /* We have to check bottom of image here, can't depend on upsampler. */
00224   max_rows = cinfo->output_height - post->starting_row;
00225   if (num_rows > max_rows)
00226     num_rows = max_rows;
00227 
00228   /* Quantize and emit data. */
00229   (*cinfo->cquantize->color_quantize) (cinfo,
00230                 post->buffer + post->next_row, output_buf + *out_row_ctr,
00231                 (int) num_rows);
00232   *out_row_ctr += num_rows;
00233 
00234   /* Advance if we filled the strip. */
00235   post->next_row += num_rows;
00236   if (post->next_row >= post->strip_height) {
00237     post->starting_row += post->strip_height;
00238     post->next_row = 0;
00239   }
00240 }

00163 {
00164   my_post_ptr post = (my_post_ptr) cinfo->post;
00165   JDIMENSION old_next_row, num_rows;
00166 
00167   /* Reposition virtual buffer if at start of strip. */
00168   if (post->next_row == 0) {
00169     post->buffer = (*cinfo->mem->access_virt_sarray)
00170         ((j_common_ptr) cinfo, post->whole_image,
00171          post->starting_row, post->strip_height, TRUE);
00172   }
00173 
00174   /* Upsample some data (up to a strip height's worth). */
00175   old_next_row = post->next_row;
00176   (*cinfo->upsample->upsample) (cinfo,
00177                 input_buf, in_row_group_ctr, in_row_groups_avail,
00178                 post->buffer, &post->next_row, post->strip_height);
00179 
00180   /* Allow quantizer to scan new data.  No data is emitted, */
00181   /* but we advance out_row_ctr so outer loop can tell when we're done. */
00182   if (post->next_row > old_next_row) {
00183     num_rows = post->next_row - old_next_row;
00184     (*cinfo->cquantize->color_quantize) (cinfo, post->buffer + old_next_row,
00185                                          (JSAMPARRAY) NULL, (int) num_rows);
00186     *out_row_ctr += num_rows;
00187   }
00188 
00189   /* Advance if we filled the strip. */
00190   if (post->next_row >= post->strip_height) {
00191     post->starting_row += post->strip_height;
00192     post->next_row = 0;
00193   }
00194 }

00074 {
00075   my_post_ptr post = (my_post_ptr) cinfo->post;
00076 
00077   switch (pass_mode) {
00078   case JBUF_PASS_THRU:
00079     if (cinfo->quantize_colors) {
00080       /* Single-pass processing with color quantization. */
00081       post->pub.post_process_data = post_process_1pass;
00082       /* We could be doing buffered-image output before starting a 2-pass
00083        * color quantization; in that case, jinit_d_post_controller did not
00084        * allocate a strip buffer.  Use the virtual-array buffer as workspace.
00085        */
00086       if (post->buffer == NULL) {
00087         post->buffer = (*cinfo->mem->access_virt_sarray)
00088           ((j_common_ptr) cinfo, post->whole_image,
00089            (JDIMENSION) 0, post->strip_height, TRUE);
00090       }
00091     } else {
00092       /* For single-pass processing without color quantization,
00093        * I have no work to do; just call the upsampler directly.
00094        */
00095       post->pub.post_process_data = cinfo->upsample->upsample;
00096     }
00097     break;
00098 #ifdef QUANT_2PASS_SUPPORTED
00099   case JBUF_SAVE_AND_PASS:
00100     /* First pass of 2-pass quantization */
00101     if (post->whole_image == NULL)
00102       ERREXIT(cinfo, JERR_BAD_BUFFER_MODE);
00103     post->pub.post_process_data = post_process_prepass;
00104     break;
00105   case JBUF_CRANK_DEST:
00106     /* Second pass of 2-pass quantization */
00107     if (post->whole_image == NULL)
00108       ERREXIT(cinfo, JERR_BAD_BUFFER_MODE);
00109     post->pub.post_process_data = post_process_2pass;
00110     break;
00111 #endif /* QUANT_2PASS_SUPPORTED */
00112   default:
00113     ERREXIT(cinfo, JERR_BAD_BUFFER_MODE);
00114     break;
00115   }
00116   post->starting_row = post->next_row = 0;
00117 }