1ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov#if !defined(_FX_JPEG_TURBO_)
2ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov/*
3ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * jdmaster.c
4ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov *
5ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * Copyright (C) 1991-1997, Thomas G. Lane.
6ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * This file is part of the Independent JPEG Group's software.
7ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * For conditions of distribution and use, see the accompanying README file.
8ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov *
9ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * This file contains master control logic for the JPEG decompressor.
10ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * These routines are concerned with selecting the modules to be executed
11ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * and with determining the number of passes and the work to be done in each
12ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * pass.
13ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov */
14ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov
15ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov#define JPEG_INTERNALS
16ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov#include "jinclude.h"
17ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov#include "jpeglib.h"
18ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov
19ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov
20ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov/* Private state */
21ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov
22ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganovtypedef struct {
23ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  struct jpeg_decomp_master pub; /* public fields */
24ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov
25ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  int pass_number;		/* # of passes completed */
26ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov
27ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  boolean using_merged_upsample; /* TRUE if using merged upsample/cconvert */
28ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov
29ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  /* Saved references to initialized quantizer modules,
30ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov   * in case we need to switch modes.
31ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov   */
32ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  struct jpeg_color_quantizer * quantizer_1pass;
33ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  struct jpeg_color_quantizer * quantizer_2pass;
34ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov} my_decomp_master;
35ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov
36ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganovtypedef my_decomp_master * my_master_ptr;
37ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov
38ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov
39ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov/*
40ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * Determine whether merged upsample/color conversion should be used.
41ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * CRUCIAL: this must match the actual capabilities of jdmerge.c!
42ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov */
43ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov
44ee451cb395940862dad63c85adfe8f2fd55e864cSvet GanovLOCAL(boolean)
45ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganovuse_merged_upsample (j_decompress_ptr cinfo)
46ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov{
47ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov#ifdef UPSAMPLE_MERGING_SUPPORTED
48ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  /* Merging is the equivalent of plain box-filter upsampling */
49ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  if (cinfo->do_fancy_upsampling || cinfo->CCIR601_sampling)
50ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    return FALSE;
51ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  /* jdmerge.c only supports YCC=>RGB color conversion */
52ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  if (cinfo->jpeg_color_space != JCS_YCbCr || cinfo->num_components != 3 ||
53ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov      cinfo->out_color_space != JCS_RGB ||
54ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov      cinfo->out_color_components != RGB_PIXELSIZE)
55ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    return FALSE;
56ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  /* and it only handles 2h1v or 2h2v sampling ratios */
57ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  if (cinfo->comp_info[0].h_samp_factor != 2 ||
58ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov      cinfo->comp_info[1].h_samp_factor != 1 ||
59ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov      cinfo->comp_info[2].h_samp_factor != 1 ||
60ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov      cinfo->comp_info[0].v_samp_factor >  2 ||
61ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov      cinfo->comp_info[1].v_samp_factor != 1 ||
62ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov      cinfo->comp_info[2].v_samp_factor != 1)
63ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    return FALSE;
64ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  /* furthermore, it doesn't work if we've scaled the IDCTs differently */
65ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  if (cinfo->comp_info[0].DCT_scaled_size != cinfo->min_DCT_scaled_size ||
66ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov      cinfo->comp_info[1].DCT_scaled_size != cinfo->min_DCT_scaled_size ||
67ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov      cinfo->comp_info[2].DCT_scaled_size != cinfo->min_DCT_scaled_size)
68ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    return FALSE;
69ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  /* ??? also need to test for upsample-time rescaling, when & if supported */
70ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  return TRUE;			/* by golly, it'll work... */
71ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov#else
72ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  return FALSE;
73ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov#endif
74ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov}
75ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov
76ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov
77ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov/*
78ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * Compute output image dimensions and related values.
79ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * NOTE: this is exported for possible use by application.
80ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * Hence it mustn't do anything that can't be done twice.
81ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * Also note that it may be called before the master module is initialized!
82ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov */
83ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov
84ee451cb395940862dad63c85adfe8f2fd55e864cSvet GanovGLOBAL(void)
85ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganovjpeg_calc_output_dimensions (j_decompress_ptr cinfo)
86ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov/* Do computations that are needed before master selection phase */
87ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov{
88ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov#ifdef IDCT_SCALING_SUPPORTED
89ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  int ci;
90ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  jpeg_component_info *compptr;
91ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov#endif
92ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov
93ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  /* Prevent application from calling me at wrong times */
94ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  if (cinfo->global_state != DSTATE_READY)
95ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
96ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov
97ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov#ifdef IDCT_SCALING_SUPPORTED
98ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov
99ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  /* Compute actual output image dimensions and DCT scaling choices. */
100ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  if (cinfo->scale_num * 8 <= cinfo->scale_denom) {
101ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    /* Provide 1/8 scaling */
102ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    cinfo->output_width = (JDIMENSION)
103ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov      jdiv_round_up((long) cinfo->image_width, 8L);
104ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    cinfo->output_height = (JDIMENSION)
105ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov      jdiv_round_up((long) cinfo->image_height, 8L);
106ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    cinfo->min_DCT_scaled_size = 1;
107ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  } else if (cinfo->scale_num * 4 <= cinfo->scale_denom) {
108ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    /* Provide 1/4 scaling */
109ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    cinfo->output_width = (JDIMENSION)
110ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov      jdiv_round_up((long) cinfo->image_width, 4L);
111ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    cinfo->output_height = (JDIMENSION)
112ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov      jdiv_round_up((long) cinfo->image_height, 4L);
113ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    cinfo->min_DCT_scaled_size = 2;
114ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  } else if (cinfo->scale_num * 2 <= cinfo->scale_denom) {
115ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    /* Provide 1/2 scaling */
116ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    cinfo->output_width = (JDIMENSION)
117ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov      jdiv_round_up((long) cinfo->image_width, 2L);
118ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    cinfo->output_height = (JDIMENSION)
119ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov      jdiv_round_up((long) cinfo->image_height, 2L);
120ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    cinfo->min_DCT_scaled_size = 4;
121ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  } else {
122ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    /* Provide 1/1 scaling */
123ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    cinfo->output_width = cinfo->image_width;
124ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    cinfo->output_height = cinfo->image_height;
125ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    cinfo->min_DCT_scaled_size = DCTSIZE;
126ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  }
127ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  /* In selecting the actual DCT scaling for each component, we try to
128ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov   * scale up the chroma components via IDCT scaling rather than upsampling.
129ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov   * This saves time if the upsampler gets to use 1:1 scaling.
130ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov   * Note this code assumes that the supported DCT scalings are powers of 2.
131ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov   */
132ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
133ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov       ci++, compptr++) {
134ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    int ssize = cinfo->min_DCT_scaled_size;
135ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    while (ssize < DCTSIZE &&
136ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov	   (compptr->h_samp_factor * ssize * 2 <=
137ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov	    cinfo->max_h_samp_factor * cinfo->min_DCT_scaled_size) &&
138ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov	   (compptr->v_samp_factor * ssize * 2 <=
139ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov	    cinfo->max_v_samp_factor * cinfo->min_DCT_scaled_size)) {
140ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov      ssize = ssize * 2;
141ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    }
142ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    compptr->DCT_scaled_size = ssize;
143ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  }
144ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov
145ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  /* Recompute downsampled dimensions of components;
146ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov   * application needs to know these if using raw downsampled data.
147ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov   */
148ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
149ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov       ci++, compptr++) {
150ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    /* Size in samples, after IDCT scaling */
151ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    compptr->downsampled_width = (JDIMENSION)
152ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov      jdiv_round_up((long) cinfo->image_width *
153ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov		    (long) (compptr->h_samp_factor * compptr->DCT_scaled_size),
154ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov		    (long) (cinfo->max_h_samp_factor * DCTSIZE));
155ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    compptr->downsampled_height = (JDIMENSION)
156ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov      jdiv_round_up((long) cinfo->image_height *
157ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov		    (long) (compptr->v_samp_factor * compptr->DCT_scaled_size),
158ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov		    (long) (cinfo->max_v_samp_factor * DCTSIZE));
159ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  }
160ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov
161ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov#else /* !IDCT_SCALING_SUPPORTED */
162ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov
163ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  /* Hardwire it to "no scaling" */
164ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  cinfo->output_width = cinfo->image_width;
165ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  cinfo->output_height = cinfo->image_height;
166ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  /* jdinput.c has already initialized DCT_scaled_size to DCTSIZE,
167ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov   * and has computed unscaled downsampled_width and downsampled_height.
168ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov   */
169ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov
170ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov#endif /* IDCT_SCALING_SUPPORTED */
171ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov
172ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  /* Report number of components in selected colorspace. */
173ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  /* Probably this should be in the color conversion module... */
174ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  switch (cinfo->out_color_space) {
175ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  case JCS_GRAYSCALE:
176ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    cinfo->out_color_components = 1;
177ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    break;
178ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  case JCS_RGB:
179ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov#if RGB_PIXELSIZE != 3
180ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    cinfo->out_color_components = RGB_PIXELSIZE;
181ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    break;
182ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov#endif /* else share code with YCbCr */
183ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  case JCS_YCbCr:
184ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    cinfo->out_color_components = 3;
185ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    break;
186ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  case JCS_CMYK:
187ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  case JCS_YCCK:
188ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    cinfo->out_color_components = 4;
189ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    break;
190ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  default:			/* else must be same colorspace as in file */
191ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    cinfo->out_color_components = cinfo->num_components;
192ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    break;
193ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  }
194ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  cinfo->output_components = (cinfo->quantize_colors ? 1 :
195ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov			      cinfo->out_color_components);
196ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov
197ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  /* See if upsampler will want to emit more than one row at a time */
198ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  if (use_merged_upsample(cinfo))
199ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    cinfo->rec_outbuf_height = cinfo->max_v_samp_factor;
200ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  else
201ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    cinfo->rec_outbuf_height = 1;
202ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov}
203ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov
204ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov
205ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov/*
206ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * Several decompression processes need to range-limit values to the range
207ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * 0..MAXJSAMPLE; the input value may fall somewhat outside this range
208ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * due to noise introduced by quantization, roundoff error, etc.  These
209ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * processes are inner loops and need to be as fast as possible.  On most
210ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * machines, particularly CPUs with pipelines or instruction prefetch,
211ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * a (subscript-check-less) C table lookup
212ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov *		x = sample_range_limit[x];
213ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * is faster than explicit tests
214ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov *		if (x < 0)  x = 0;
215ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov *		else if (x > MAXJSAMPLE)  x = MAXJSAMPLE;
216ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * These processes all use a common table prepared by the routine below.
217ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov *
218ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * For most steps we can mathematically guarantee that the initial value
219ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * of x is within MAXJSAMPLE+1 of the legal range, so a table running from
220ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * -(MAXJSAMPLE+1) to 2*MAXJSAMPLE+1 is sufficient.  But for the initial
221ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * limiting step (just after the IDCT), a wildly out-of-range value is
222ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * possible if the input data is corrupt.  To avoid any chance of indexing
223ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * off the end of memory and getting a bad-pointer trap, we perform the
224ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * post-IDCT limiting thus:
225ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov *		x = range_limit[x & MASK];
226ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * where MASK is 2 bits wider than legal sample data, ie 10 bits for 8-bit
227ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * samples.  Under normal circumstances this is more than enough range and
228ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * a correct output will be generated; with bogus input data the mask will
229ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * cause wraparound, and we will safely generate a bogus-but-in-range output.
230ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * For the post-IDCT step, we want to convert the data from signed to unsigned
231ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * representation by adding CENTERJSAMPLE at the same time that we limit it.
232ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * So the post-IDCT limiting table ends up looking like this:
233ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov *   CENTERJSAMPLE,CENTERJSAMPLE+1,...,MAXJSAMPLE,
234ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov *   MAXJSAMPLE (repeat 2*(MAXJSAMPLE+1)-CENTERJSAMPLE times),
235ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov *   0          (repeat 2*(MAXJSAMPLE+1)-CENTERJSAMPLE times),
236ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov *   0,1,...,CENTERJSAMPLE-1
237ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * Negative inputs select values from the upper half of the table after
238ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * masking.
239ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov *
240ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * We can save some space by overlapping the start of the post-IDCT table
241ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * with the simpler range limiting table.  The post-IDCT table begins at
242ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * sample_range_limit + CENTERJSAMPLE.
243ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov *
244ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * Note that the table is allocated in near data space on PCs; it's small
245ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * enough and used often enough to justify this.
246ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov */
247ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov
248ee451cb395940862dad63c85adfe8f2fd55e864cSvet GanovLOCAL(void)
249ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganovprepare_range_limit_table (j_decompress_ptr cinfo)
250ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov/* Allocate and fill in the sample_range_limit table */
251ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov{
252ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  JSAMPLE * table;
253ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  int i;
254ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov
255ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  table = (JSAMPLE *)
256ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
257ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov		(5 * (MAXJSAMPLE+1) + CENTERJSAMPLE) * SIZEOF(JSAMPLE));
258ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  table += (MAXJSAMPLE+1);	/* allow negative subscripts of simple table */
259ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  cinfo->sample_range_limit = table;
260ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  /* First segment of "simple" table: limit[x] = 0 for x < 0 */
261ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  MEMZERO(table - (MAXJSAMPLE+1), (MAXJSAMPLE+1) * SIZEOF(JSAMPLE));
262ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  /* Main part of "simple" table: limit[x] = x */
263ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  for (i = 0; i <= MAXJSAMPLE; i++)
264ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    table[i] = (JSAMPLE) i;
265ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  table += CENTERJSAMPLE;	/* Point to where post-IDCT table starts */
266ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  /* End of simple table, rest of first half of post-IDCT table */
267ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  for (i = CENTERJSAMPLE; i < 2*(MAXJSAMPLE+1); i++)
268ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    table[i] = MAXJSAMPLE;
269ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  /* Second half of post-IDCT table */
270ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  MEMZERO(table + (2 * (MAXJSAMPLE+1)),
271ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov	  (2 * (MAXJSAMPLE+1) - CENTERJSAMPLE) * SIZEOF(JSAMPLE));
272ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  MEMCOPY(table + (4 * (MAXJSAMPLE+1) - CENTERJSAMPLE),
273ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov	  cinfo->sample_range_limit, CENTERJSAMPLE * SIZEOF(JSAMPLE));
274ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov}
275ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov
276ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov
277ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov/*
278ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * Master selection of decompression modules.
279ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * This is done once at jpeg_start_decompress time.  We determine
280ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * which modules will be used and give them appropriate initialization calls.
281ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * We also initialize the decompressor input side to begin consuming data.
282ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov *
283ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * Since jpeg_read_header has finished, we know what is in the SOF
284ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * and (first) SOS markers.  We also have all the application parameter
285ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * settings.
286ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov */
287ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov
288ee451cb395940862dad63c85adfe8f2fd55e864cSvet GanovLOCAL(void)
289ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganovmaster_selection (j_decompress_ptr cinfo)
290ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov{
291ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  my_master_ptr master = (my_master_ptr) cinfo->master;
292ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  boolean use_c_buffer;
293ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  long samplesperrow;
294ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  JDIMENSION jd_samplesperrow;
295ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov
296ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  /* Initialize dimensions and other stuff */
297ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  jpeg_calc_output_dimensions(cinfo);
298ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  prepare_range_limit_table(cinfo);
299ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov
300ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  /* Width of an output scanline must be representable as JDIMENSION. */
301ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  samplesperrow = (long) cinfo->output_width * (long) cinfo->out_color_components;
302ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  jd_samplesperrow = (JDIMENSION) samplesperrow;
303ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  if ((long) jd_samplesperrow != samplesperrow)
304ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    ERREXIT(cinfo, JERR_WIDTH_OVERFLOW);
305ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov
306ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  /* Initialize my private state */
307ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  master->pass_number = 0;
308ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  master->using_merged_upsample = use_merged_upsample(cinfo);
309ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov
310ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  /* Color quantizer selection */
311ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  master->quantizer_1pass = NULL;
312ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  master->quantizer_2pass = NULL;
313ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  /* No mode changes if not using buffered-image mode. */
314ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  if (! cinfo->quantize_colors || ! cinfo->buffered_image) {
315ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    cinfo->enable_1pass_quant = FALSE;
316ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    cinfo->enable_external_quant = FALSE;
317ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    cinfo->enable_2pass_quant = FALSE;
318ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  }
319ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  if (cinfo->quantize_colors) {
320ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    if (cinfo->raw_data_out)
321ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov      ERREXIT(cinfo, JERR_NOTIMPL);
322ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    /* 2-pass quantizer only works in 3-component color space. */
323ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    if (cinfo->out_color_components != 3) {
324ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov      cinfo->enable_1pass_quant = TRUE;
325ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov      cinfo->enable_external_quant = FALSE;
326ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov      cinfo->enable_2pass_quant = FALSE;
327ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov      cinfo->colormap = NULL;
328ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    } else if (cinfo->colormap != NULL) {
329ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov      cinfo->enable_external_quant = TRUE;
330ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    } else if (cinfo->two_pass_quantize) {
331ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov      cinfo->enable_2pass_quant = TRUE;
332ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    } else {
333ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov      cinfo->enable_1pass_quant = TRUE;
334ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    }
335ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov
336ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    if (cinfo->enable_1pass_quant) {
337ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov#ifdef QUANT_1PASS_SUPPORTED
338ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov      jinit_1pass_quantizer(cinfo);
339ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov      master->quantizer_1pass = cinfo->cquantize;
340ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov#else
341ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov      ERREXIT(cinfo, JERR_NOT_COMPILED);
342ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov#endif
343ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    }
344ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov
345ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    /* We use the 2-pass code to map to external colormaps. */
346ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    if (cinfo->enable_2pass_quant || cinfo->enable_external_quant) {
347ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov#ifdef QUANT_2PASS_SUPPORTED
348ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov      jinit_2pass_quantizer(cinfo);
349ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov      master->quantizer_2pass = cinfo->cquantize;
350ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov#else
351ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov      ERREXIT(cinfo, JERR_NOT_COMPILED);
352ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov#endif
353ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    }
354ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    /* If both quantizers are initialized, the 2-pass one is left active;
355ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov     * this is necessary for starting with quantization to an external map.
356ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov     */
357ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  }
358ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov
359ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  /* Post-processing: in particular, color conversion first */
360ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  if (! cinfo->raw_data_out) {
361ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    if (master->using_merged_upsample) {
362ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov#ifdef UPSAMPLE_MERGING_SUPPORTED
363ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov      jinit_merged_upsampler(cinfo); /* does color conversion too */
364ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov#else
365ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov      ERREXIT(cinfo, JERR_NOT_COMPILED);
366ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov#endif
367ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    } else {
368ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov      jinit_color_deconverter(cinfo);
369ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov      jinit_upsampler(cinfo);
370ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    }
371ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    jinit_d_post_controller(cinfo, cinfo->enable_2pass_quant);
372ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  }
373ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  /* Inverse DCT */
374ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  jinit_inverse_dct(cinfo);
375ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  /* Entropy decoding: either Huffman or arithmetic coding. */
376ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  if (cinfo->arith_code) {
377ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    ERREXIT(cinfo, JERR_ARITH_NOTIMPL);
378ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  } else {
379ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    if (cinfo->progressive_mode) {
380ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov#ifdef D_PROGRESSIVE_SUPPORTED
381ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov      jinit_phuff_decoder(cinfo);
382ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov#else
383ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov      ERREXIT(cinfo, JERR_NOT_COMPILED);
384ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov#endif
385ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    } else
386ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov      jinit_huff_decoder(cinfo);
387ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  }
388ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov
389ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  /* Initialize principal buffer controllers. */
390ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  use_c_buffer = cinfo->inputctl->has_multiple_scans || cinfo->buffered_image;
391ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  jinit_d_coef_controller(cinfo, use_c_buffer);
392ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov
393ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  if (! cinfo->raw_data_out)
394ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    jinit_d_main_controller(cinfo, FALSE /* never need full buffer here */);
395ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov
396ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  /* We can now tell the memory manager to allocate virtual arrays. */
397ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  (*cinfo->mem->realize_virt_arrays) ((j_common_ptr) cinfo);
398ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov
399ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  /* Initialize input side of decompressor to consume first scan. */
400ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  (*cinfo->inputctl->start_input_pass) (cinfo);
401ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov
402ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov#ifdef D_MULTISCAN_FILES_SUPPORTED
403ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  /* If jpeg_start_decompress will read the whole file, initialize
404ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov   * progress monitoring appropriately.  The input step is counted
405ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov   * as one pass.
406ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov   */
407ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  if (cinfo->progress != NULL && ! cinfo->buffered_image &&
408ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov      cinfo->inputctl->has_multiple_scans) {
409ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    int nscans;
410ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    /* Estimate number of scans to set pass_limit. */
411ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    if (cinfo->progressive_mode) {
412ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov      /* Arbitrarily estimate 2 interleaved DC scans + 3 AC scans/component. */
413ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov      nscans = 2 + 3 * cinfo->num_components;
414ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    } else {
415ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov      /* For a nonprogressive multiscan file, estimate 1 scan per component. */
416ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov      nscans = cinfo->num_components;
417ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    }
418ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    cinfo->progress->pass_counter = 0L;
419ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    cinfo->progress->pass_limit = (long) cinfo->total_iMCU_rows * nscans;
420ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    cinfo->progress->completed_passes = 0;
421ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    cinfo->progress->total_passes = (cinfo->enable_2pass_quant ? 3 : 2);
422ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    /* Count the input pass as done */
423ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    master->pass_number++;
424ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  }
425ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov#endif /* D_MULTISCAN_FILES_SUPPORTED */
426ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov}
427ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov
428ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov
429ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov/*
430ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * Per-pass setup.
431ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * This is called at the beginning of each output pass.  We determine which
432ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * modules will be active during this pass and give them appropriate
433ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * start_pass calls.  We also set is_dummy_pass to indicate whether this
434ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * is a "real" output pass or a dummy pass for color quantization.
435ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * (In the latter case, jdapistd.c will crank the pass to completion.)
436ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov */
437ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov
438ee451cb395940862dad63c85adfe8f2fd55e864cSvet GanovMETHODDEF(void)
439ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganovprepare_for_output_pass (j_decompress_ptr cinfo)
440ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov{
441ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  my_master_ptr master = (my_master_ptr) cinfo->master;
442ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov
443ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  if (master->pub.is_dummy_pass) {
444ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov#ifdef QUANT_2PASS_SUPPORTED
445ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    /* Final pass of 2-pass quantization */
446ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    master->pub.is_dummy_pass = FALSE;
447ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    (*cinfo->cquantize->start_pass) (cinfo, FALSE);
448ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    (*cinfo->post->start_pass) (cinfo, JBUF_CRANK_DEST);
449ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    (*cinfo->main->start_pass) (cinfo, JBUF_CRANK_DEST);
450ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov#else
451ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    ERREXIT(cinfo, JERR_NOT_COMPILED);
452ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov#endif /* QUANT_2PASS_SUPPORTED */
453ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  } else {
454ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    if (cinfo->quantize_colors && cinfo->colormap == NULL) {
455ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov      /* Select new quantization method */
456ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov      if (cinfo->two_pass_quantize && cinfo->enable_2pass_quant) {
457ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov	cinfo->cquantize = master->quantizer_2pass;
458ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov	master->pub.is_dummy_pass = TRUE;
459ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov      } else if (cinfo->enable_1pass_quant) {
460ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov	cinfo->cquantize = master->quantizer_1pass;
461ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov      } else {
462ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov	ERREXIT(cinfo, JERR_MODE_CHANGE);
463ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov      }
464ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    }
465ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    (*cinfo->idct->start_pass) (cinfo);
466ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    (*cinfo->coef->start_output_pass) (cinfo);
467ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    if (! cinfo->raw_data_out) {
468ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov      if (! master->using_merged_upsample)
469ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov	(*cinfo->cconvert->start_pass) (cinfo);
470ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov      (*cinfo->upsample->start_pass) (cinfo);
471ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov      if (cinfo->quantize_colors)
472ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov	(*cinfo->cquantize->start_pass) (cinfo, master->pub.is_dummy_pass);
473ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov      (*cinfo->post->start_pass) (cinfo,
474ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov	    (master->pub.is_dummy_pass ? JBUF_SAVE_AND_PASS : JBUF_PASS_THRU));
475ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov      (*cinfo->main->start_pass) (cinfo, JBUF_PASS_THRU);
476ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    }
477ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  }
478ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov
479ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  /* Set up progress monitor's pass info if present */
480ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  if (cinfo->progress != NULL) {
481ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    cinfo->progress->completed_passes = master->pass_number;
482ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    cinfo->progress->total_passes = master->pass_number +
483ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov				    (master->pub.is_dummy_pass ? 2 : 1);
484ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    /* In buffered-image mode, we assume one more output pass if EOI not
485ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov     * yet reached, but no more passes if EOI has been reached.
486ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov     */
487ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    if (cinfo->buffered_image && ! cinfo->inputctl->eoi_reached) {
488ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov      cinfo->progress->total_passes += (cinfo->enable_2pass_quant ? 2 : 1);
489ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    }
490ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  }
491ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov}
492ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov
493ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov
494ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov/*
495ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * Finish up at end of an output pass.
496ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov */
497ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov
498ee451cb395940862dad63c85adfe8f2fd55e864cSvet GanovMETHODDEF(void)
499ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganovfinish_output_pass (j_decompress_ptr cinfo)
500ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov{
501ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  my_master_ptr master = (my_master_ptr) cinfo->master;
502ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov
503ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  if (cinfo->quantize_colors)
504ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    (*cinfo->cquantize->finish_pass) (cinfo);
505ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  master->pass_number++;
506ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov}
507ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov
508ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov
509ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov#ifdef D_MULTISCAN_FILES_SUPPORTED
510ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov
511ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov/*
512ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * Switch to a new external colormap between output passes.
513ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov */
514ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov
515ee451cb395940862dad63c85adfe8f2fd55e864cSvet GanovGLOBAL(void)
516ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganovjpeg_new_colormap (j_decompress_ptr cinfo)
517ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov{
518ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  my_master_ptr master = (my_master_ptr) cinfo->master;
519ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov
520ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  /* Prevent application from calling me at wrong times */
521ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  if (cinfo->global_state != DSTATE_BUFIMAGE)
522ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
523ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov
524ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  if (cinfo->quantize_colors && cinfo->enable_external_quant &&
525ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov      cinfo->colormap != NULL) {
526ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    /* Select 2-pass quantizer for external colormap use */
527ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    cinfo->cquantize = master->quantizer_2pass;
528ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    /* Notify quantizer of colormap change */
529ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    (*cinfo->cquantize->new_color_map) (cinfo);
530ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    master->pub.is_dummy_pass = FALSE; /* just in case */
531ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  } else
532ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov    ERREXIT(cinfo, JERR_MODE_CHANGE);
533ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov}
534ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov
535ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov#endif /* D_MULTISCAN_FILES_SUPPORTED */
536ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov
537ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov
538ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov/*
539ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * Initialize master decompression control and select active modules.
540ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * This is performed at the start of jpeg_start_decompress.
541ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov */
542ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov
543ee451cb395940862dad63c85adfe8f2fd55e864cSvet GanovGLOBAL(void)
544ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganovjinit_master_decompress (j_decompress_ptr cinfo)
545ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov{
546ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  my_master_ptr master;
547ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov
548ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  master = (my_master_ptr)
549ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov      (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
550ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov				  SIZEOF(my_decomp_master));
551ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  cinfo->master = (struct jpeg_decomp_master *) master;
552ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  master->pub.prepare_for_output_pass = prepare_for_output_pass;
553ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  master->pub.finish_output_pass = finish_output_pass;
554ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov
555ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  master->pub.is_dummy_pass = FALSE;
556ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov
557ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov  master_selection(cinfo);
558ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov}
559ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov
560ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov#endif //_FX_JPEG_TURBO_
561