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jdapistd.c File Reference
#include "jinclude.h"
#include "jpeglib.h"
Include dependency graph for jdapistd.c:

Go to the source code of this file.

Macros

#define JPEG_INTERNALS
 

Functions

 LOCAL (boolean)
 
 output_pass_setup (j_decompress_ptr cinfo)
 
 jpeg_read_scanlines (j_decompress_ptr cinfo, JSAMPARRAY scanlines, JDIMENSION max_lines)
 
 jpeg_read_raw_data (j_decompress_ptr cinfo, JSAMPIMAGE data, JDIMENSION max_lines)
 

Macro Definition Documentation

◆ JPEG_INTERNALS

#define JPEG_INTERNALS

Definition at line 18 of file jdapistd.c.

Function Documentation

◆ jpeg_read_raw_data()

jpeg_read_raw_data ( j_decompress_ptr  cinfo,
JSAMPIMAGE  data,
JDIMENSION  max_lines 
)

Definition at line 186 of file jdapistd.c.

188 {
189  JDIMENSION lines_per_iMCU_row;
190 
191  if (cinfo->global_state != DSTATE_RAW_OK)
192  ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
193  if (cinfo->output_scanline >= cinfo->output_height) {
194  WARNMS(cinfo, JWRN_TOO_MUCH_DATA);
195  return 0;
196  }
197 
198  /* Call progress monitor hook if present */
199  if (cinfo->progress != NULL) {
200  cinfo->progress->pass_counter = (long) cinfo->output_scanline;
201  cinfo->progress->pass_limit = (long) cinfo->output_height;
202  (*cinfo->progress->progress_monitor) ((j_common_ptr) cinfo);
203  }
204 
205  /* Verify that at least one iMCU row can be returned. */
206  lines_per_iMCU_row = cinfo->max_v_samp_factor * cinfo->min_DCT_v_scaled_size;
207  if (max_lines < lines_per_iMCU_row)
208  ERREXIT(cinfo, JERR_BUFFER_SIZE);
209 
210  /* Decompress directly into user's buffer. */
211  if (! (*cinfo->coef->decompress_data) (cinfo, data))
212  return 0; /* suspension forced, can do nothing more */
213 
214  /* OK, we processed one iMCU row. */
215  cinfo->output_scanline += lines_per_iMCU_row;
216  return lines_per_iMCU_row;
217 }
#define DSTATE_RAW_OK
Definition: jpegint.h:36
JDIMENSION output_height
Definition: jpeglib.h:508
#define ERREXIT(msg)
Definition: rdjpgcom.c:72
JSAMPARRAY JDIMENSION max_lines
Definition: jpeglib.h:1057
struct jpeg_d_coef_controller * coef
Definition: jpeglib.h:680
smooth NULL
Definition: ftsmooth.c:416
#define WARNMS(cinfo, code)
Definition: jerror.h:251
GLint GLenum GLsizei GLsizei GLsizei GLint GLsizei const GLvoid * data
Definition: gl.h:1950
#define ERREXIT1(cinfo, code, p1)
Definition: jerror.h:212
JDIMENSION output_scanline
Definition: jpeglib.h:537
#define long
Definition: qsort.c:33
unsigned int JDIMENSION
Definition: jmorecfg.h:229

◆ jpeg_read_scanlines()

jpeg_read_scanlines ( j_decompress_ptr  cinfo,
JSAMPARRAY  scanlines,
JDIMENSION  max_lines 
)

Definition at line 153 of file jdapistd.c.

155 {
156  JDIMENSION row_ctr;
157 
158  if (cinfo->global_state != DSTATE_SCANNING)
159  ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
160  if (cinfo->output_scanline >= cinfo->output_height) {
161  WARNMS(cinfo, JWRN_TOO_MUCH_DATA);
162  return 0;
163  }
164 
165  /* Call progress monitor hook if present */
166  if (cinfo->progress != NULL) {
167  cinfo->progress->pass_counter = (long) cinfo->output_scanline;
168  cinfo->progress->pass_limit = (long) cinfo->output_height;
169  (*cinfo->progress->progress_monitor) ((j_common_ptr) cinfo);
170  }
171 
172  /* Process some data */
173  row_ctr = 0;
174  (*cinfo->main->process_data) (cinfo, scanlines, &row_ctr, max_lines);
175  cinfo->output_scanline += row_ctr;
176  return row_ctr;
177 }
JDIMENSION output_height
Definition: jpeglib.h:508
struct jpeg_d_main_controller * main
Definition: jpeglib.h:679
JSAMPARRAY JDIMENSION max_lines
Definition: jpeglib.h:1057
smooth NULL
Definition: ftsmooth.c:416
#define WARNMS(cinfo, code)
Definition: jerror.h:251
#define DSTATE_SCANNING
Definition: jpegint.h:35
#define ERREXIT1(cinfo, code, p1)
Definition: jerror.h:212
JSAMPARRAY scanlines
Definition: jpeglib.h:1016
JDIMENSION output_scanline
Definition: jpeglib.h:537
#define long
Definition: qsort.c:33
unsigned int JDIMENSION
Definition: jmorecfg.h:229

Referenced by main(), and read_JPEG_file().

◆ LOCAL()

LOCAL ( boolean  )

Definition at line 24 of file jdapistd.c.

40 {
41  if (cinfo->global_state == DSTATE_READY) {
42  /* First call: initialize master control, select active modules */
44  if (cinfo->buffered_image) {
45  /* No more work here; expecting jpeg_start_output next */
46  cinfo->global_state = DSTATE_BUFIMAGE;
47  return TRUE;
48  }
49  cinfo->global_state = DSTATE_PRELOAD;
50  }
51  if (cinfo->global_state == DSTATE_PRELOAD) {
52  /* If file has multiple scans, absorb them all into the coef buffer */
53  if (cinfo->inputctl->has_multiple_scans) {
54 #ifdef D_MULTISCAN_FILES_SUPPORTED
55  for (;;) {
56  int retcode;
57  /* Call progress monitor hook if present */
58  if (cinfo->progress != NULL)
59  (*cinfo->progress->progress_monitor) ((j_common_ptr) cinfo);
60  /* Absorb some more input */
61  retcode = (*cinfo->inputctl->consume_input) (cinfo);
62  if (retcode == JPEG_SUSPENDED)
63  return FALSE;
64  if (retcode == JPEG_REACHED_EOI)
65  break;
66  /* Advance progress counter if appropriate */
67  if (cinfo->progress != NULL &&
68  (retcode == JPEG_ROW_COMPLETED || retcode == JPEG_REACHED_SOS)) {
69  if (++cinfo->progress->pass_counter >= cinfo->progress->pass_limit) {
70  /* jdmaster underestimated number of scans; ratchet up one scan */
71  cinfo->progress->pass_limit += (long) cinfo->total_iMCU_rows;
72  }
73  }
74  }
75 #else
76  ERREXIT(cinfo, JERR_NOT_COMPILED);
77 #endif /* D_MULTISCAN_FILES_SUPPORTED */
78  }
79  cinfo->output_scan_number = cinfo->input_scan_number;
80  } else if (cinfo->global_state != DSTATE_PRESCAN)
81  ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
82  /* Perform any dummy output passes, and set up for the final pass */
83  return output_pass_setup(cinfo);
84 }
#define ERREXIT(msg)
Definition: rdjpgcom.c:72
#define TRUE
Definition: types.h:120
#define JPEG_REACHED_SOS
Definition: jpeglib.h:1076
#define JPEG_REACHED_EOI
Definition: jpeglib.h:1077
#define DSTATE_BUFIMAGE
Definition: jpegint.h:37
#define JPEG_ROW_COMPLETED
Definition: jpeglib.h:1078
#define DSTATE_PRELOAD
Definition: jpegint.h:33
#define FALSE
Definition: types.h:117
smooth NULL
Definition: ftsmooth.c:416
#define DSTATE_READY
Definition: jpegint.h:32
jinit_master_decompress(j_decompress_ptr cinfo)
Definition: jdmaster.c:526
#define ERREXIT1(cinfo, code, p1)
Definition: jerror.h:212
#define DSTATE_PRESCAN
Definition: jpegint.h:34
output_pass_setup(j_decompress_ptr cinfo)
Definition: jdapistd.c:96
#define long
Definition: qsort.c:33
#define JPEG_SUSPENDED
Definition: jpeglib.h:1045

◆ output_pass_setup()

output_pass_setup ( j_decompress_ptr  cinfo)

Definition at line 96 of file jdapistd.c.

97 {
98  if (cinfo->global_state != DSTATE_PRESCAN) {
99  /* First call: do pass setup */
100  (*cinfo->master->prepare_for_output_pass) (cinfo);
101  cinfo->output_scanline = 0;
102  cinfo->global_state = DSTATE_PRESCAN;
103  }
104  /* Loop over any required dummy passes */
105  while (cinfo->master->is_dummy_pass) {
106 #ifdef QUANT_2PASS_SUPPORTED
107  /* Crank through the dummy pass */
108  while (cinfo->output_scanline < cinfo->output_height) {
109  JDIMENSION last_scanline;
110  /* Call progress monitor hook if present */
111  if (cinfo->progress != NULL) {
112  cinfo->progress->pass_counter = (long) cinfo->output_scanline;
113  cinfo->progress->pass_limit = (long) cinfo->output_height;
114  (*cinfo->progress->progress_monitor) ((j_common_ptr) cinfo);
115  }
116  /* Process some data */
117  last_scanline = cinfo->output_scanline;
118  (*cinfo->main->process_data) (cinfo, (JSAMPARRAY) NULL,
119  &cinfo->output_scanline, (JDIMENSION) 0);
120  if (cinfo->output_scanline == last_scanline)
121  return FALSE; /* No progress made, must suspend */
122  }
123  /* Finish up dummy pass, and set up for another one */
124  (*cinfo->master->finish_output_pass) (cinfo);
125  (*cinfo->master->prepare_for_output_pass) (cinfo);
126  cinfo->output_scanline = 0;
127 #else
128  ERREXIT(cinfo, JERR_NOT_COMPILED);
129 #endif /* QUANT_2PASS_SUPPORTED */
130  }
131  /* Ready for application to drive output pass through
132  * jpeg_read_scanlines or jpeg_read_raw_data.
133  */
134  cinfo->global_state = cinfo->raw_data_out ? DSTATE_RAW_OK : DSTATE_SCANNING;
135  return TRUE;
136 }
#define DSTATE_RAW_OK
Definition: jpegint.h:36
JDIMENSION output_height
Definition: jpeglib.h:508
#define ERREXIT(msg)
Definition: rdjpgcom.c:72
#define TRUE
Definition: types.h:120
struct jpeg_d_main_controller * main
Definition: jpeglib.h:679
#define FALSE
Definition: types.h:117
smooth NULL
Definition: ftsmooth.c:416
struct jpeg_decomp_master * master
Definition: jpeglib.h:678
#define DSTATE_SCANNING
Definition: jpegint.h:35
JSAMPROW * JSAMPARRAY
Definition: jpeglib.h:76
JDIMENSION output_scanline
Definition: jpeglib.h:537
#define DSTATE_PRESCAN
Definition: jpegint.h:34
#define long
Definition: qsort.c:33
unsigned int JDIMENSION
Definition: jmorecfg.h:229