#include "jinclude.h"
#include "jpeglib.h"
Go to the source code of this file.
Data Structures | |
struct | my_prep_controller |
Defines | |
#define | CONTEXT_ROWS_SUPPORTED |
#define | JPEG_INTERNALS |
Typedefs | |
typedef my_prep_controller * | my_prep_ptr |
Functions | |
create_context_buffer (j_compress_ptr cinfo) | |
expand_bottom_edge (JSAMPARRAY image_data, JDIMENSION num_cols, int input_rows, int output_rows) | |
jinit_c_prep_controller (j_compress_ptr cinfo, boolean need_full_buffer) | |
pre_process_context (j_compress_ptr cinfo, JSAMPARRAY input_buf, JDIMENSION *in_row_ctr, JDIMENSION in_rows_avail, JSAMPIMAGE output_buf, JDIMENSION *out_row_group_ctr, JDIMENSION out_row_groups_avail) | |
pre_process_data (j_compress_ptr cinfo, JSAMPARRAY input_buf, JDIMENSION *in_row_ctr, JDIMENSION in_rows_avail, JSAMPIMAGE output_buf, JDIMENSION *out_row_group_ctr, JDIMENSION out_row_groups_avail) | |
start_pass_prep (j_compress_ptr cinfo, J_BUF_MODE pass_mode) |
#define CONTEXT_ROWS_SUPPORTED |
Definition at line 28 of file jcprepct.c.
#define JPEG_INTERNALS |
Definition at line 17 of file jcprepct.c.
typedef my_prep_controller* my_prep_ptr |
Definition at line 70 of file jcprepct.c.
create_context_buffer | ( | j_compress_ptr | cinfo | ) |
Definition at line 267 of file jcprepct.c.
References my_prep_controller::color_buf, compptr, DCTSIZE, jpeg_component_info::h_samp_factor, JPOOL_IMAGE, MEMCOPY, SIZEOF, and jpeg_component_info::width_in_blocks.
Referenced by jinit_c_prep_controller().
00268 { 00269 my_prep_ptr prep = (my_prep_ptr) cinfo->prep; 00270 int rgroup_height = cinfo->max_v_samp_factor; 00271 int ci, i; 00272 jpeg_component_info * compptr; 00273 JSAMPARRAY true_buffer, fake_buffer; 00274 00275 /* Grab enough space for fake row pointers for all the components; 00276 * we need five row groups' worth of pointers for each component. 00277 */ 00278 fake_buffer = (JSAMPARRAY) 00279 (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, 00280 (cinfo->num_components * 5 * rgroup_height) * 00281 SIZEOF(JSAMPROW)); 00282 00283 for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components; 00284 ci++, compptr++) { 00285 /* Allocate the actual buffer space (3 row groups) for this component. 00286 * We make the buffer wide enough to allow the downsampler to edge-expand 00287 * horizontally within the buffer, if it so chooses. 00288 */ 00289 true_buffer = (*cinfo->mem->alloc_sarray) 00290 ((j_common_ptr) cinfo, JPOOL_IMAGE, 00291 (JDIMENSION) (((long) compptr->width_in_blocks * DCTSIZE * 00292 cinfo->max_h_samp_factor) / compptr->h_samp_factor), 00293 (JDIMENSION) (3 * rgroup_height)); 00294 /* Copy true buffer row pointers into the middle of the fake row array */ 00295 MEMCOPY(fake_buffer + rgroup_height, true_buffer, 00296 3 * rgroup_height * SIZEOF(JSAMPROW)); 00297 /* Fill in the above and below wraparound pointers */ 00298 for (i = 0; i < rgroup_height; i++) { 00299 fake_buffer[i] = true_buffer[2 * rgroup_height + i]; 00300 fake_buffer[4 * rgroup_height + i] = true_buffer[i]; 00301 } 00302 prep->color_buf[ci] = fake_buffer + rgroup_height; 00303 fake_buffer += 5 * rgroup_height; /* point to space for next component */ 00304 } 00305 }
expand_bottom_edge | ( | JSAMPARRAY | image_data, | |
JDIMENSION | num_cols, | |||
int | input_rows, | |||
int | output_rows | |||
) |
Definition at line 106 of file jcprepct.c.
References jcopy_sample_rows().
Referenced by pre_process_context(), and pre_process_data().
00108 { 00109 register int row; 00110 00111 for (row = input_rows; row < output_rows; row++) { 00112 jcopy_sample_rows(image_data, input_rows-1, image_data, row, 00113 1, num_cols); 00114 } 00115 }
jinit_c_prep_controller | ( | j_compress_ptr | cinfo, | |
boolean | need_full_buffer | |||
) |
Definition at line 315 of file jcprepct.c.
References my_prep_controller::color_buf, compptr, create_context_buffer(), DCTSIZE, ERREXIT, jpeg_component_info::h_samp_factor, JPOOL_IMAGE, pre_process_context(), pre_process_data(), my_prep_controller::pub, SIZEOF, start_pass_prep(), and jpeg_component_info::width_in_blocks.
Referenced by jinit_compress_master().
00316 { 00317 my_prep_ptr prep; 00318 int ci; 00319 jpeg_component_info * compptr; 00320 00321 if (need_full_buffer) /* safety check */ 00322 ERREXIT(cinfo, JERR_BAD_BUFFER_MODE); 00323 00324 prep = (my_prep_ptr) 00325 (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, 00326 SIZEOF(my_prep_controller)); 00327 cinfo->prep = (struct jpeg_c_prep_controller *) prep; 00328 prep->pub.start_pass = start_pass_prep; 00329 00330 /* Allocate the color conversion buffer. 00331 * We make the buffer wide enough to allow the downsampler to edge-expand 00332 * horizontally within the buffer, if it so chooses. 00333 */ 00334 if (cinfo->downsample->need_context_rows) { 00335 /* Set up to provide context rows */ 00336 #ifdef CONTEXT_ROWS_SUPPORTED 00337 prep->pub.pre_process_data = pre_process_context; 00338 create_context_buffer(cinfo); 00339 #else 00340 ERREXIT(cinfo, JERR_NOT_COMPILED); 00341 #endif 00342 } else { 00343 /* No context, just make it tall enough for one row group */ 00344 prep->pub.pre_process_data = pre_process_data; 00345 for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components; 00346 ci++, compptr++) { 00347 prep->color_buf[ci] = (*cinfo->mem->alloc_sarray) 00348 ((j_common_ptr) cinfo, JPOOL_IMAGE, 00349 (JDIMENSION) (((long) compptr->width_in_blocks * DCTSIZE * 00350 cinfo->max_h_samp_factor) / compptr->h_samp_factor), 00351 (JDIMENSION) cinfo->max_v_samp_factor); 00352 } 00353 } 00354 }
pre_process_context | ( | j_compress_ptr | cinfo, | |
JSAMPARRAY | input_buf, | |||
JDIMENSION * | in_row_ctr, | |||
JDIMENSION | in_rows_avail, | |||
JSAMPIMAGE | output_buf, | |||
JDIMENSION * | out_row_group_ctr, | |||
JDIMENSION | out_row_groups_avail | |||
) |
Definition at line 195 of file jcprepct.c.
References my_prep_controller::color_buf, expand_bottom_edge(), jcopy_sample_rows(), MIN, my_prep_controller::next_buf_row, my_prep_controller::next_buf_stop, my_prep_controller::rows_to_go, and my_prep_controller::this_row_group.
Referenced by jinit_c_prep_controller().
00200 { 00201 my_prep_ptr prep = (my_prep_ptr) cinfo->prep; 00202 int numrows, ci; 00203 int buf_height = cinfo->max_v_samp_factor * 3; 00204 JDIMENSION inrows; 00205 00206 while (*out_row_group_ctr < out_row_groups_avail) { 00207 if (*in_row_ctr < in_rows_avail) { 00208 /* Do color conversion to fill the conversion buffer. */ 00209 inrows = in_rows_avail - *in_row_ctr; 00210 numrows = prep->next_buf_stop - prep->next_buf_row; 00211 numrows = (int) MIN((JDIMENSION) numrows, inrows); 00212 (*cinfo->cconvert->color_convert) (cinfo, input_buf + *in_row_ctr, 00213 prep->color_buf, 00214 (JDIMENSION) prep->next_buf_row, 00215 numrows); 00216 /* Pad at top of image, if first time through */ 00217 if (prep->rows_to_go == cinfo->image_height) { 00218 for (ci = 0; ci < cinfo->num_components; ci++) { 00219 int row; 00220 for (row = 1; row <= cinfo->max_v_samp_factor; row++) { 00221 jcopy_sample_rows(prep->color_buf[ci], 0, 00222 prep->color_buf[ci], -row, 00223 1, cinfo->image_width); 00224 } 00225 } 00226 } 00227 *in_row_ctr += numrows; 00228 prep->next_buf_row += numrows; 00229 prep->rows_to_go -= numrows; 00230 } else { 00231 /* Return for more data, unless we are at the bottom of the image. */ 00232 if (prep->rows_to_go != 0) 00233 break; 00234 /* When at bottom of image, pad to fill the conversion buffer. */ 00235 if (prep->next_buf_row < prep->next_buf_stop) { 00236 for (ci = 0; ci < cinfo->num_components; ci++) { 00237 expand_bottom_edge(prep->color_buf[ci], cinfo->image_width, 00238 prep->next_buf_row, prep->next_buf_stop); 00239 } 00240 prep->next_buf_row = prep->next_buf_stop; 00241 } 00242 } 00243 /* If we've gotten enough data, downsample a row group. */ 00244 if (prep->next_buf_row == prep->next_buf_stop) { 00245 (*cinfo->downsample->downsample) (cinfo, 00246 prep->color_buf, 00247 (JDIMENSION) prep->this_row_group, 00248 output_buf, *out_row_group_ctr); 00249 (*out_row_group_ctr)++; 00250 /* Advance pointers with wraparound as necessary. */ 00251 prep->this_row_group += cinfo->max_v_samp_factor; 00252 if (prep->this_row_group >= buf_height) 00253 prep->this_row_group = 0; 00254 if (prep->next_buf_row >= buf_height) 00255 prep->next_buf_row = 0; 00256 prep->next_buf_stop = prep->next_buf_row + cinfo->max_v_samp_factor; 00257 } 00258 } 00259 }
pre_process_data | ( | j_compress_ptr | cinfo, | |
JSAMPARRAY | input_buf, | |||
JDIMENSION * | in_row_ctr, | |||
JDIMENSION | in_rows_avail, | |||
JSAMPIMAGE | output_buf, | |||
JDIMENSION * | out_row_group_ctr, | |||
JDIMENSION | out_row_groups_avail | |||
) |
Definition at line 128 of file jcprepct.c.
References my_prep_controller::color_buf, compptr, DCTSIZE, expand_bottom_edge(), MIN, my_prep_controller::next_buf_row, my_prep_controller::rows_to_go, jpeg_component_info::v_samp_factor, and jpeg_component_info::width_in_blocks.
Referenced by jinit_c_prep_controller().
00133 { 00134 my_prep_ptr prep = (my_prep_ptr) cinfo->prep; 00135 int numrows, ci; 00136 JDIMENSION inrows; 00137 jpeg_component_info * compptr; 00138 00139 while (*in_row_ctr < in_rows_avail && 00140 *out_row_group_ctr < out_row_groups_avail) { 00141 /* Do color conversion to fill the conversion buffer. */ 00142 inrows = in_rows_avail - *in_row_ctr; 00143 numrows = cinfo->max_v_samp_factor - prep->next_buf_row; 00144 numrows = (int) MIN((JDIMENSION) numrows, inrows); 00145 (*cinfo->cconvert->color_convert) (cinfo, input_buf + *in_row_ctr, 00146 prep->color_buf, 00147 (JDIMENSION) prep->next_buf_row, 00148 numrows); 00149 *in_row_ctr += numrows; 00150 prep->next_buf_row += numrows; 00151 prep->rows_to_go -= numrows; 00152 /* If at bottom of image, pad to fill the conversion buffer. */ 00153 if (prep->rows_to_go == 0 && 00154 prep->next_buf_row < cinfo->max_v_samp_factor) { 00155 for (ci = 0; ci < cinfo->num_components; ci++) { 00156 expand_bottom_edge(prep->color_buf[ci], cinfo->image_width, 00157 prep->next_buf_row, cinfo->max_v_samp_factor); 00158 } 00159 prep->next_buf_row = cinfo->max_v_samp_factor; 00160 } 00161 /* If we've filled the conversion buffer, empty it. */ 00162 if (prep->next_buf_row == cinfo->max_v_samp_factor) { 00163 (*cinfo->downsample->downsample) (cinfo, 00164 prep->color_buf, (JDIMENSION) 0, 00165 output_buf, *out_row_group_ctr); 00166 prep->next_buf_row = 0; 00167 (*out_row_group_ctr)++; 00168 } 00169 /* If at bottom of image, pad the output to a full iMCU height. 00170 * Note we assume the caller is providing a one-iMCU-height output buffer! 00171 */ 00172 if (prep->rows_to_go == 0 && 00173 *out_row_group_ctr < out_row_groups_avail) { 00174 for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components; 00175 ci++, compptr++) { 00176 expand_bottom_edge(output_buf[ci], 00177 compptr->width_in_blocks * DCTSIZE, 00178 (int) (*out_row_group_ctr * compptr->v_samp_factor), 00179 (int) (out_row_groups_avail * compptr->v_samp_factor)); 00180 } 00181 *out_row_group_ctr = out_row_groups_avail; 00182 break; /* can exit outer loop without test */ 00183 } 00184 } 00185 }
start_pass_prep | ( | j_compress_ptr | cinfo, | |
J_BUF_MODE | pass_mode | |||
) |
Definition at line 78 of file jcprepct.c.
References ERREXIT, JBUF_PASS_THRU, my_prep_controller::next_buf_row, my_prep_controller::next_buf_stop, my_prep_controller::rows_to_go, and my_prep_controller::this_row_group.
Referenced by jinit_c_prep_controller().
00079 { 00080 my_prep_ptr prep = (my_prep_ptr) cinfo->prep; 00081 00082 if (pass_mode != JBUF_PASS_THRU) 00083 ERREXIT(cinfo, JERR_BAD_BUFFER_MODE); 00084 00085 /* Initialize total-height counter for detecting bottom of image */ 00086 prep->rows_to_go = cinfo->image_height; 00087 /* Mark the conversion buffer empty */ 00088 prep->next_buf_row = 0; 00089 #ifdef CONTEXT_ROWS_SUPPORTED 00090 /* Preset additional state variables for context mode. 00091 * These aren't used in non-context mode, so we needn't test which mode. 00092 */ 00093 prep->this_row_group = 0; 00094 /* Set next_buf_stop to stop after two row groups have been read in. */ 00095 prep->next_buf_stop = 2 * cinfo->max_v_samp_factor; 00096 #endif 00097 }