ReactOS  0.4.14-dev-998-g623dd26
jcinit.c
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1 /*
2  * jcinit.c
3  *
4  * Copyright (C) 1991-1997, Thomas G. Lane.
5  * Modified 2003-2017 by Guido Vollbeding.
6  * This file is part of the Independent JPEG Group's software.
7  * For conditions of distribution and use, see the accompanying README file.
8  *
9  * This file contains initialization logic for the JPEG compressor.
10  * This routine is in charge of selecting the modules to be executed and
11  * making an initialization call to each one.
12  *
13  * Logically, this code belongs in jcmaster.c. It's split out because
14  * linking this routine implies linking the entire compression library.
15  * For a transcoding-only application, we want to be able to use jcmaster.c
16  * without linking in the whole library.
17  */
18 
19 #define JPEG_INTERNALS
20 #include "jinclude.h"
21 #include "jpeglib.h"
22 
23 
24 /*
25  * Compute JPEG image dimensions and related values.
26  * NOTE: this is exported for possible use by application.
27  * Hence it mustn't do anything that can't be done twice.
28  */
29 
30 GLOBAL(void)
32 /* Do computations that are needed before master selection phase */
33 {
34  /* Sanity check on input image dimensions to prevent overflow in
35  * following calculations.
36  * We do check jpeg_width and jpeg_height in initial_setup in jcmaster.c,
37  * but image_width and image_height can come from arbitrary data,
38  * and we need some space for multiplication by block_size.
39  */
40  if (((long) cinfo->image_width >> 24) || ((long) cinfo->image_height >> 24))
41  ERREXIT1(cinfo, JERR_IMAGE_TOO_BIG, (unsigned int) JPEG_MAX_DIMENSION);
42 
43 #ifdef DCT_SCALING_SUPPORTED
44 
45  /* Compute actual JPEG image dimensions and DCT scaling choices. */
46  if (cinfo->scale_num >= cinfo->scale_denom * cinfo->block_size) {
47  /* Provide block_size/1 scaling */
48  cinfo->jpeg_width = cinfo->image_width * cinfo->block_size;
49  cinfo->jpeg_height = cinfo->image_height * cinfo->block_size;
50  cinfo->min_DCT_h_scaled_size = 1;
51  cinfo->min_DCT_v_scaled_size = 1;
52  } else if (cinfo->scale_num * 2 >= cinfo->scale_denom * cinfo->block_size) {
53  /* Provide block_size/2 scaling */
54  cinfo->jpeg_width = (JDIMENSION)
55  jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 2L);
56  cinfo->jpeg_height = (JDIMENSION)
57  jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 2L);
58  cinfo->min_DCT_h_scaled_size = 2;
59  cinfo->min_DCT_v_scaled_size = 2;
60  } else if (cinfo->scale_num * 3 >= cinfo->scale_denom * cinfo->block_size) {
61  /* Provide block_size/3 scaling */
62  cinfo->jpeg_width = (JDIMENSION)
63  jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 3L);
64  cinfo->jpeg_height = (JDIMENSION)
65  jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 3L);
66  cinfo->min_DCT_h_scaled_size = 3;
67  cinfo->min_DCT_v_scaled_size = 3;
68  } else if (cinfo->scale_num * 4 >= cinfo->scale_denom * cinfo->block_size) {
69  /* Provide block_size/4 scaling */
70  cinfo->jpeg_width = (JDIMENSION)
71  jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 4L);
72  cinfo->jpeg_height = (JDIMENSION)
73  jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 4L);
74  cinfo->min_DCT_h_scaled_size = 4;
75  cinfo->min_DCT_v_scaled_size = 4;
76  } else if (cinfo->scale_num * 5 >= cinfo->scale_denom * cinfo->block_size) {
77  /* Provide block_size/5 scaling */
78  cinfo->jpeg_width = (JDIMENSION)
79  jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 5L);
80  cinfo->jpeg_height = (JDIMENSION)
81  jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 5L);
82  cinfo->min_DCT_h_scaled_size = 5;
83  cinfo->min_DCT_v_scaled_size = 5;
84  } else if (cinfo->scale_num * 6 >= cinfo->scale_denom * cinfo->block_size) {
85  /* Provide block_size/6 scaling */
86  cinfo->jpeg_width = (JDIMENSION)
87  jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 6L);
88  cinfo->jpeg_height = (JDIMENSION)
89  jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 6L);
90  cinfo->min_DCT_h_scaled_size = 6;
91  cinfo->min_DCT_v_scaled_size = 6;
92  } else if (cinfo->scale_num * 7 >= cinfo->scale_denom * cinfo->block_size) {
93  /* Provide block_size/7 scaling */
94  cinfo->jpeg_width = (JDIMENSION)
95  jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 7L);
96  cinfo->jpeg_height = (JDIMENSION)
97  jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 7L);
98  cinfo->min_DCT_h_scaled_size = 7;
99  cinfo->min_DCT_v_scaled_size = 7;
100  } else if (cinfo->scale_num * 8 >= cinfo->scale_denom * cinfo->block_size) {
101  /* Provide block_size/8 scaling */
102  cinfo->jpeg_width = (JDIMENSION)
103  jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 8L);
104  cinfo->jpeg_height = (JDIMENSION)
105  jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 8L);
106  cinfo->min_DCT_h_scaled_size = 8;
107  cinfo->min_DCT_v_scaled_size = 8;
108  } else if (cinfo->scale_num * 9 >= cinfo->scale_denom * cinfo->block_size) {
109  /* Provide block_size/9 scaling */
110  cinfo->jpeg_width = (JDIMENSION)
111  jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 9L);
112  cinfo->jpeg_height = (JDIMENSION)
113  jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 9L);
114  cinfo->min_DCT_h_scaled_size = 9;
115  cinfo->min_DCT_v_scaled_size = 9;
116  } else if (cinfo->scale_num * 10 >= cinfo->scale_denom * cinfo->block_size) {
117  /* Provide block_size/10 scaling */
118  cinfo->jpeg_width = (JDIMENSION)
119  jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 10L);
120  cinfo->jpeg_height = (JDIMENSION)
121  jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 10L);
122  cinfo->min_DCT_h_scaled_size = 10;
123  cinfo->min_DCT_v_scaled_size = 10;
124  } else if (cinfo->scale_num * 11 >= cinfo->scale_denom * cinfo->block_size) {
125  /* Provide block_size/11 scaling */
126  cinfo->jpeg_width = (JDIMENSION)
127  jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 11L);
128  cinfo->jpeg_height = (JDIMENSION)
129  jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 11L);
130  cinfo->min_DCT_h_scaled_size = 11;
131  cinfo->min_DCT_v_scaled_size = 11;
132  } else if (cinfo->scale_num * 12 >= cinfo->scale_denom * cinfo->block_size) {
133  /* Provide block_size/12 scaling */
134  cinfo->jpeg_width = (JDIMENSION)
135  jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 12L);
136  cinfo->jpeg_height = (JDIMENSION)
137  jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 12L);
138  cinfo->min_DCT_h_scaled_size = 12;
139  cinfo->min_DCT_v_scaled_size = 12;
140  } else if (cinfo->scale_num * 13 >= cinfo->scale_denom * cinfo->block_size) {
141  /* Provide block_size/13 scaling */
142  cinfo->jpeg_width = (JDIMENSION)
143  jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 13L);
144  cinfo->jpeg_height = (JDIMENSION)
145  jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 13L);
146  cinfo->min_DCT_h_scaled_size = 13;
147  cinfo->min_DCT_v_scaled_size = 13;
148  } else if (cinfo->scale_num * 14 >= cinfo->scale_denom * cinfo->block_size) {
149  /* Provide block_size/14 scaling */
150  cinfo->jpeg_width = (JDIMENSION)
151  jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 14L);
152  cinfo->jpeg_height = (JDIMENSION)
153  jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 14L);
154  cinfo->min_DCT_h_scaled_size = 14;
155  cinfo->min_DCT_v_scaled_size = 14;
156  } else if (cinfo->scale_num * 15 >= cinfo->scale_denom * cinfo->block_size) {
157  /* Provide block_size/15 scaling */
158  cinfo->jpeg_width = (JDIMENSION)
159  jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 15L);
160  cinfo->jpeg_height = (JDIMENSION)
161  jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 15L);
162  cinfo->min_DCT_h_scaled_size = 15;
163  cinfo->min_DCT_v_scaled_size = 15;
164  } else {
165  /* Provide block_size/16 scaling */
166  cinfo->jpeg_width = (JDIMENSION)
167  jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 16L);
168  cinfo->jpeg_height = (JDIMENSION)
169  jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 16L);
170  cinfo->min_DCT_h_scaled_size = 16;
171  cinfo->min_DCT_v_scaled_size = 16;
172  }
173 
174 #else /* !DCT_SCALING_SUPPORTED */
175 
176  /* Hardwire it to "no scaling" */
177  cinfo->jpeg_width = cinfo->image_width;
178  cinfo->jpeg_height = cinfo->image_height;
179  cinfo->min_DCT_h_scaled_size = DCTSIZE;
180  cinfo->min_DCT_v_scaled_size = DCTSIZE;
181 
182 #endif /* DCT_SCALING_SUPPORTED */
183 }
184 
185 
186 /*
187  * Master selection of compression modules.
188  * This is done once at the start of processing an image. We determine
189  * which modules will be used and give them appropriate initialization calls.
190  */
191 
192 GLOBAL(void)
194 {
195  long samplesperrow;
196  JDIMENSION jd_samplesperrow;
197 
198  /* For now, precision must match compiled-in value... */
199  if (cinfo->data_precision != BITS_IN_JSAMPLE)
200  ERREXIT1(cinfo, JERR_BAD_PRECISION, cinfo->data_precision);
201 
202  /* Sanity check on input image dimensions */
203  if (cinfo->image_height <= 0 || cinfo->image_width <= 0 ||
204  cinfo->input_components <= 0)
205  ERREXIT(cinfo, JERR_EMPTY_IMAGE);
206 
207  /* Width of an input scanline must be representable as JDIMENSION. */
208  samplesperrow = (long) cinfo->image_width * (long) cinfo->input_components;
209  jd_samplesperrow = (JDIMENSION) samplesperrow;
210  if ((long) jd_samplesperrow != samplesperrow)
211  ERREXIT(cinfo, JERR_WIDTH_OVERFLOW);
212 
213  /* Compute JPEG image dimensions and related values. */
215 
216  /* Initialize master control (includes parameter checking/processing) */
217  jinit_c_master_control(cinfo, FALSE /* full compression */);
218 
219  /* Preprocessing */
220  if (! cinfo->raw_data_in) {
221  jinit_color_converter(cinfo);
222  jinit_downsampler(cinfo);
223  jinit_c_prep_controller(cinfo, FALSE /* never need full buffer here */);
224  }
225  /* Forward DCT */
226  jinit_forward_dct(cinfo);
227  /* Entropy encoding: either Huffman or arithmetic coding. */
228  if (cinfo->arith_code)
229  jinit_arith_encoder(cinfo);
230  else {
231  jinit_huff_encoder(cinfo);
232  }
233 
234  /* Need a full-image coefficient buffer in any multi-pass mode. */
236  (boolean) (cinfo->num_scans > 1 || cinfo->optimize_coding));
237  jinit_c_main_controller(cinfo, FALSE /* never need full buffer here */);
238 
239  jinit_marker_writer(cinfo);
240 
241  /* We can now tell the memory manager to allocate virtual arrays. */
242  (*cinfo->mem->realize_virt_arrays) ((j_common_ptr) cinfo);
243 
244  /* Write the datastream header (SOI) immediately.
245  * Frame and scan headers are postponed till later.
246  * This lets application insert special markers after the SOI.
247  */
248  (*cinfo->marker->write_file_header) (cinfo);
249 }
#define BITS_IN_JSAMPLE
Definition: jmorecfg.h:33
#define ERREXIT(msg)
Definition: rdjpgcom.c:72
jinit_c_main_controller(j_compress_ptr cinfo, boolean need_full_buffer)
Definition: jcmainct.c:248
jinit_forward_dct(j_compress_ptr cinfo)
Definition: jcdctmgr.c:458
jpeg_calc_jpeg_dimensions(j_compress_ptr cinfo)
Definition: jcinit.c:31
#define JPEG_MAX_DIMENSION
Definition: jmorecfg.h:231
jinit_color_converter(j_compress_ptr cinfo)
Definition: jccolor.c:438
jinit_downsampler(j_compress_ptr cinfo)
Definition: jcsample.c:478
jinit_arith_encoder(j_compress_ptr cinfo)
Definition: jcarith.c:926
jdiv_round_up(long a, long b)
Definition: jutils.c:124
jinit_huff_encoder(j_compress_ptr cinfo)
Definition: jchuff.c:1622
static const WCHAR L[]
Definition: oid.c:1250
#define ERREXIT1(cinfo, code, p1)
Definition: jerror.h:212
#define GLOBAL(type)
Definition: jmorecfg.h:291
jinit_marker_writer(j_compress_ptr cinfo)
Definition: jcmarker.c:699
#define long
Definition: qsort.c:33
#define DCTSIZE
Definition: jpeglib.h:50
jinit_c_master_control(j_compress_ptr cinfo, boolean transcode_only)
Definition: jcmaster.c:623
unsigned int JDIMENSION
Definition: jmorecfg.h:229
jinit_compress_master(j_compress_ptr cinfo)
Definition: jcinit.c:193
jinit_c_coef_controller(j_compress_ptr cinfo, boolean need_full_buffer)
Definition: jccoefct.c:410
jinit_c_prep_controller(j_compress_ptr cinfo, boolean need_full_buffer)
Definition: jcprepct.c:318