/*

* jcparam.c

*

* This file was part of the Independent JPEG Group's software:

* Copyright (C) 1991-1998, Thomas G. Lane.

* Modified 2003-2008 by Guido Vollbeding.

* libjpeg-turbo Modifications:

* Copyright (C) 2009-2011, D. R. Commander.

* mozjpeg Modifications:

* Copyright (C) 2014, Mozilla Corporation.

* For conditions of distribution and use, see the accompanying README file.

*

* This file contains optional default-setting code for the JPEG compressor.

* Applications do not have to use this file, but those that don't use it

* must know a lot more about the innards of the JPEG code.

*/

#define JPEG_INTERNALS

#include "jinclude.h"

#include "jpeglib.h"

/*

* Quantization table setup routines

*/

GLOBAL(void)

jpeg_add_quant_table (j_compress_ptr cinfo, int which_tbl,

const unsigned int *basic_table,

int scale_factor, boolean force_baseline)

/* Define a quantization table equal to the basic_table times

* a scale factor (given as a percentage).

* If force_baseline is TRUE, the computed quantization table entries

* are limited to 1..255 for JPEG baseline compatibility.

*/

{

JQUANT_TBL ** qtblptr;

int i;

long temp;

/* Safety check to ensure start_compress not called yet. */

if (cinfo->global_state != CSTATE_START)

ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);

if (which_tbl < 0 || which_tbl >= NUM_QUANT_TBLS)

ERREXIT1(cinfo, JERR_DQT_INDEX, which_tbl);

qtblptr = & cinfo->quant_tbl_ptrs[which_tbl];

if (*qtblptr == NULL)

*qtblptr = jpeg_alloc_quant_table((j_common_ptr) cinfo);

for (i = 0; i < DCTSIZE2; i++) {

temp = ((long) basic_table[i] * scale_factor + 50L) / 100L;

/* limit the values to the valid range */

if (temp <= 0L) temp = 1L;

if (temp > 32767L) temp = 32767L; /* max quantizer needed for 12 bits */

if (force_baseline && temp > 255L)

temp = 255L; /* limit to baseline range if requested */

(*qtblptr)->quantval[i] = (UINT16) temp;

}

/* Initialize sent_table FALSE so table will be written to JPEG file. */

(*qtblptr)->sent_table = FALSE;

}

/* These are the sample quantization tables given in JPEG spec section K.1.

* The spec says that the values given produce "good" quality, and

* when divided by 2, "very good" quality.

*/

static const unsigned int std_luminance_quant_tbl[DCTSIZE2] = {

16, 11, 10, 16, 24, 40, 51, 61,

12, 12, 14, 19, 26, 58, 60, 55,

14, 13, 16, 24, 40, 57, 69, 56,

14, 17, 22, 29, 51, 87, 80, 62,

18, 22, 37, 56, 68, 109, 103, 77,

24, 35, 55, 64, 81, 104, 113, 92,

49, 64, 78, 87, 103, 121, 120, 101,

72, 92, 95, 98, 112, 100, 103, 99

};

static const unsigned int std_chrominance_quant_tbl[DCTSIZE2] = {

17, 18, 24, 47, 99, 99, 99, 99,

18, 21, 26, 66, 99, 99, 99, 99,

24, 26, 56, 99, 99, 99, 99, 99,

47, 66, 99, 99, 99, 99, 99, 99,

99, 99, 99, 99, 99, 99, 99, 99,

99, 99, 99, 99, 99, 99, 99, 99,

99, 99, 99, 99, 99, 99, 99, 99,

99, 99, 99, 99, 99, 99, 99, 99

};

static const unsigned int flat_quant_tbl[DCTSIZE2] = {

16, 16, 16, 16, 16, 16, 16, 16,

16, 16, 16, 16, 16, 16, 16, 16,

16, 16, 16, 16, 16, 16, 16, 16,

16, 16, 16, 16, 16, 16, 16, 16,

16, 16, 16, 16, 16, 16, 16, 16,

16, 16, 16, 16, 16, 16, 16, 16,

16, 16, 16, 16, 16, 16, 16, 16,

16, 16, 16, 16, 16, 16, 16, 16

};

#if JPEG_LIB_VERSION >= 70

GLOBAL(void)

jpeg_default_qtables (j_compress_ptr cinfo, boolean force_baseline)

/* Set or change the 'quality' (quantization) setting, using default tables

* and straight percentage-scaling quality scales.

* This entry point allows different scalings for luminance and chrominance.

*/

{

/* Set up two quantization tables using the specified scaling */

if (cinfo->use_flat_quant_tbl) {

jpeg_add_quant_table(cinfo, 0, flat_quant_tbl,

cinfo->q_scale_factor[0], force_baseline);

jpeg_add_quant_table(cinfo, 1, flat_quant_tbl,

cinfo->q_scale_factor[1], force_baseline);

} else {

jpeg_add_quant_table(cinfo, 0, std_luminance_quant_tbl,

cinfo->q_scale_factor[0], force_baseline);

jpeg_add_quant_table(cinfo, 1, std_chrominance_quant_tbl,

cinfo->q_scale_factor[1], force_baseline);

}

}

#endif

GLOBAL(void)

jpeg_set_linear_quality (j_compress_ptr cinfo, int scale_factor,

boolean force_baseline)

/* Set or change the 'quality' (quantization) setting, using default tables

* and a straight percentage-scaling quality scale. In most cases it's better

* to use jpeg_set_quality (below); this entry point is provided for

* applications that insist on a linear percentage scaling.

*/

{

/* Set up two quantization tables using the specified scaling */

if (cinfo->use_flat_quant_tbl) {

jpeg_add_quant_table(cinfo, 0, flat_quant_tbl,

scale_factor, force_baseline);

jpeg_add_quant_table(cinfo, 1, flat_quant_tbl,

scale_factor, force_baseline);

} else {

jpeg_add_quant_table(cinfo, 0, std_luminance_quant_tbl,

scale_factor, force_baseline);

jpeg_add_quant_table(cinfo, 1, std_chrominance_quant_tbl,

scale_factor, force_baseline);

}

}

GLOBAL(int)

jpeg_quality_scaling (int quality)

/* Convert a user-specified quality rating to a percentage scaling factor

* for an underlying quantization table, using our recommended scaling curve.

* The input 'quality' factor should be 0 (terrible) to 100 (very good).

*/

{

/* Safety limit on quality factor. Convert 0 to 1 to avoid zero divide. */

if (quality <= 0) quality = 1;

if (quality > 100) quality = 100;

/* The basic table is used as-is (scaling 100) for a quality of 50.

* Qualities 50..100 are converted to scaling percentage 200 - 2*Q;

* note that at Q=100 the scaling is 0, which will cause jpeg_add_quant_table

* to make all the table entries 1 (hence, minimum quantization loss).

* Qualities 1..50 are converted to scaling percentage 5000/Q.

*/

if (quality < 50)

quality = 5000 / quality;

else

quality = 200 - quality*2;

return quality;

}

GLOBAL(void)

jpeg_set_quality (j_compress_ptr cinfo, int quality, boolean force_baseline)

/* Set or change the 'quality' (quantization) setting, using default tables.

* This is the standard quality-adjusting entry point for typical user

* interfaces; only those who want detailed control over quantization tables

* would use the preceding three routines directly.

*/

{

/* Convert user 0-100 rating to percentage scaling */

quality = jpeg_quality_scaling(quality);

/* Set up standard quality tables */

jpeg_set_linear_quality(cinfo, quality, force_baseline);

}

/*

* Huffman table setup routines

*/

LOCAL(void)

add_huff_table (j_compress_ptr cinfo,

JHUFF_TBL **htblptr, const UINT8 *bits, const UINT8 *val)

/* Define a Huffman table */

{

int nsymbols, len;

if (*htblptr == NULL)

*htblptr = jpeg_alloc_huff_table((j_common_ptr) cinfo);

/* Copy the number-of-symbols-of-each-code-length counts */

MEMCOPY((*htblptr)->bits, bits, SIZEOF((*htblptr)->bits));

/* Validate the counts. We do this here mainly so we can copy the right

* number of symbols from the val[] array, without risking marching off

* the end of memory. jchuff.c will do a more thorough test later.

*/

nsymbols = 0;

for (len = 1; len <= 16; len++)

nsymbols += bits[len];

if (nsymbols < 1 || nsymbols > 256)

ERREXIT(cinfo, JERR_BAD_HUFF_TABLE);

MEMCOPY((*htblptr)->huffval, val, nsymbols * SIZEOF(UINT8));

/* Initialize sent_table FALSE so table will be written to JPEG file. */

(*htblptr)->sent_table = FALSE;

}

LOCAL(void)

std_huff_tables (j_compress_ptr cinfo)

/* Set up the standard Huffman tables (cf. JPEG standard section K.3) */

/* IMPORTANT: these are only valid for 8-bit data precision! */

{

static const UINT8 bits_dc_luminance[17] =

{ /* 0-base */ 0, 0, 1, 5, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0 };

static const UINT8 val_dc_luminance[] =

{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 };

static const UINT8 bits_dc_chrominance[17] =

{ /* 0-base */ 0, 0, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0 };

static const UINT8 val_dc_chrominance[] =

{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 };

static const UINT8 bits_ac_luminance[17] =

{ /* 0-base */ 0, 0, 2, 1, 3, 3, 2, 4, 3, 5, 5, 4, 4, 0, 0, 1, 0x7d };

static const UINT8 val_ac_luminance[] =

{ 0x01, 0x02, 0x03, 0x00, 0x04, 0x11, 0x05, 0x12,

0x21, 0x31, 0x41, 0x06, 0x13, 0x51, 0x61, 0x07,

0x22, 0x71, 0x14, 0x32, 0x81, 0x91, 0xa1, 0x08,

0x23, 0x42, 0xb1, 0xc1, 0x15, 0x52, 0xd1, 0xf0,

0x24, 0x33, 0x62, 0x72, 0x82, 0x09, 0x0a, 0x16,

0x17, 0x18, 0x19, 0x1a, 0x25, 0x26, 0x27, 0x28,

0x29, 0x2a, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39,

0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49,

0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59,

0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69,

0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79,

0x7a, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89,

0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98,

0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7,

0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6,

0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3, 0xc4, 0xc5,

0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2, 0xd3, 0xd4,

0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xe1, 0xe2,

0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea,

0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,

0xf9, 0xfa };

static const UINT8 bits_ac_chrominance[17] =

{ /* 0-base */ 0, 0, 2, 1, 2, 4, 4, 3, 4, 7, 5, 4, 4, 0, 1, 2, 0x77 };

static const UINT8 val_ac_chrominance[] =

{ 0x00, 0x01, 0x02, 0x03, 0x11, 0x04, 0x05, 0x21,

0x31, 0x06, 0x12, 0x41, 0x51, 0x07, 0x61, 0x71,

0x13, 0x22, 0x32, 0x81, 0x08, 0x14, 0x42, 0x91,

0xa1, 0xb1, 0xc1, 0x09, 0x23, 0x33, 0x52, 0xf0,

0x15, 0x62, 0x72, 0xd1, 0x0a, 0x16, 0x24, 0x34,

0xe1, 0x25, 0xf1, 0x17, 0x18, 0x19, 0x1a, 0x26,

0x27, 0x28, 0x29, 0x2a, 0x35, 0x36, 0x37, 0x38,

0x39, 0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48,

0x49, 0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58,

0x59, 0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68,

0x69, 0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78,

0x79, 0x7a, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,

0x88, 0x89, 0x8a, 0x92, 0x93, 0x94, 0x95, 0x96,

0x97, 0x98, 0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5,

0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4,

0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3,

0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2,

0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda,

0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9,

0xea, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,

0xf9, 0xfa };

add_huff_table(cinfo, &cinfo->dc_huff_tbl_ptrs[0],

bits_dc_luminance, val_dc_luminance);

add_huff_table(cinfo, &cinfo->ac_huff_tbl_ptrs[0],

bits_ac_luminance, val_ac_luminance);

add_huff_table(cinfo, &cinfo->dc_huff_tbl_ptrs[1],

bits_dc_chrominance, val_dc_chrominance);

add_huff_table(cinfo, &cinfo->ac_huff_tbl_ptrs[1],

bits_ac_chrominance, val_ac_chrominance);

}

/*

* Default parameter setup for compression.

*

* Applications that don't choose to use this routine must do their

* own setup of all these parameters. Alternately, you can call this

* to establish defaults and then alter parameters selectively. This

* is the recommended approach since, if we add any new parameters,

* your code will still work (they'll be set to reasonable defaults).

*/

GLOBAL(void)

jpeg_set_defaults (j_compress_ptr cinfo)

{

int i;

/* Safety check to ensure start_compress not called yet. */

if (cinfo->global_state != CSTATE_START)

ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);

/* Allocate comp_info array large enough for maximum component count.

* Array is made permanent in case application wants to compress

* multiple images at same param settings.

*/

if (cinfo->comp_info == NULL)

cinfo->comp_info = (jpeg_component_info *)

(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,

MAX_COMPONENTS * SIZEOF(jpeg_component_info));

/* Initialize everything not dependent on the color space */

#if JPEG_LIB_VERSION >= 70

cinfo->scale_num = 1; /* 1:1 scaling */

cinfo->scale_denom = 1;

#endif

cinfo->data_precision = BITS_IN_JSAMPLE;

/* Set up two quantization tables using default quality of 75 */

jpeg_set_quality(cinfo, 75, TRUE);

/* Set up two Huffman tables */

std_huff_tables(cinfo);

/* Initialize default arithmetic coding conditioning */

for (i = 0; i < NUM_ARITH_TBLS; i++) {

cinfo->arith_dc_L[i] = 0;

cinfo->arith_dc_U[i] = 1;

cinfo->arith_ac_K[i] = 5;

}

#ifdef C_PROGRESSIVE_SUPPORTED

cinfo->scan_info = NULL;

cinfo->num_scans = 0;

if (!cinfo->use_moz_defaults) {

/* Default is no multiple-scan output */

cinfo->scan_info = NULL;

cinfo->num_scans = 0;

}

#else

/* Default is no multiple-scan output */

cinfo->scan_info = NULL;

cinfo->num_scans = 0;

#endif

/* Expect normal source image, not raw downsampled data */

cinfo->raw_data_in = FALSE;

/* Use Huffman coding, not arithmetic coding, by default */

cinfo->arith_code = FALSE;

#ifdef ENTROPY_OPT_SUPPORTED

if (cinfo->use_moz_defaults)

/* By default, do extra passes to optimize entropy coding */

cinfo->optimize_coding = TRUE;

else

/* By default, don't do extra passes to optimize entropy coding */

cinfo->optimize_coding = FALSE;

#else

/* By default, don't do extra passes to optimize entropy coding */

cinfo->optimize_coding = FALSE;

#endif

/* The standard Huffman tables are only valid for 8-bit data precision.

* If the precision is higher, force optimization on so that usable

* tables will be computed. This test can be removed if default tables

* are supplied that are valid for the desired precision.

*/

if (cinfo->data_precision > 8)

cinfo->optimize_coding = TRUE;

/* By default, use the simpler non-cosited sampling alignment */

cinfo->CCIR601_sampling = FALSE;

#if JPEG_LIB_VERSION >= 70

/* By default, apply fancy downsampling */

cinfo->do_fancy_downsampling = TRUE;

#endif

/* No input smoothing */

cinfo->smoothing_factor = 0;

/* DCT algorithm preference */

cinfo->dct_method = JDCT_DEFAULT;

/* No restart markers */

cinfo->restart_interval = 0;

cinfo->restart_in_rows = 0;

/* Fill in default JFIF marker parameters. Note that whether the marker

* will actually be written is determined by jpeg_set_colorspace.

*

* By default, the library emits JFIF version code 1.01.

* An application that wants to emit JFIF 1.02 extension markers should set

* JFIF_minor_version to 2. We could probably get away with just defaulting

* to 1.02, but there may still be some decoders in use that will complain

* about that; saying 1.01 should minimize compatibility problems.

*/

cinfo->JFIF_major_version = 1; /* Default JFIF version = 1.01 */

cinfo->JFIF_minor_version = 1;

cinfo->density_unit = 0; /* Pixel size is unknown by default */

cinfo->X_density = 1; /* Pixel aspect ratio is square by default */

cinfo->Y_density = 1;

/* Choose JPEG colorspace based on input space, set defaults accordingly */

jpeg_default_colorspace(cinfo);

cinfo->one_dc_scan = TRUE;

#ifdef C_PROGRESSIVE_SUPPORTED

if (cinfo->use_moz_defaults) {

cinfo->optimize_scans = TRUE;

jpeg_simple_progression(cinfo);

} else

cinfo->optimize_scans = FALSE;

#endif

cinfo->trellis_quant = cinfo->use_moz_defaults;

cinfo->lambda_log_scale1 = 16.0;

cinfo->lambda_log_scale2 = 15.5;

cinfo->use_lambda_weight_tbl = TRUE;

cinfo->use_scans_in_trellis = FALSE;

cinfo->trellis_freq_split = 8;

cinfo->trellis_num_loops = 1;

cinfo->trellis_q_opt = FALSE;

}

/*

* Select an appropriate JPEG colorspace for in_color_space.

*/

GLOBAL(void)

jpeg_default_colorspace (j_compress_ptr cinfo)

{

switch (cinfo->in_color_space) {

case JCS_GRAYSCALE:

jpeg_set_colorspace(cinfo, JCS_GRAYSCALE);

break;

case JCS_RGB:

case JCS_EXT_RGB:

case JCS_EXT_RGBX:

case JCS_EXT_BGR:

case JCS_EXT_BGRX:

case JCS_EXT_XBGR:

case JCS_EXT_XRGB:

case JCS_EXT_RGBA:

case JCS_EXT_BGRA:

case JCS_EXT_ABGR:

case JCS_EXT_ARGB:

jpeg_set_colorspace(cinfo, JCS_YCbCr);

break;

case JCS_YCbCr:

jpeg_set_colorspace(cinfo, JCS_YCbCr);

break;

case JCS_CMYK:

jpeg_set_colorspace(cinfo, JCS_CMYK); /* By default, no translation */

break;

case JCS_YCCK:

jpeg_set_colorspace(cinfo, JCS_YCCK);

break;

case JCS_UNKNOWN:

jpeg_set_colorspace(cinfo, JCS_UNKNOWN);

break;

default:

ERREXIT(cinfo, JERR_BAD_IN_COLORSPACE);

}

}

/*

* Set the JPEG colorspace, and choose colorspace-dependent default values.

*/

GLOBAL(void)

jpeg_set_colorspace (j_compress_ptr cinfo, J_COLOR_SPACE colorspace)

{

jpeg_component_info * compptr;

int ci;

#define SET_COMP(index,id,hsamp,vsamp,quant,dctbl,actbl) \

(compptr = &cinfo->comp_info[index], \

compptr->component_id = (id), \

compptr->h_samp_factor = (hsamp), \

compptr->v_samp_factor = (vsamp), \

compptr->quant_tbl_no = (quant), \

compptr->dc_tbl_no = (dctbl), \

compptr->ac_tbl_no = (actbl) )

/* Safety check to ensure start_compress not called yet. */

if (cinfo->global_state != CSTATE_START)

ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);

/* For all colorspaces, we use Q and Huff tables 0 for luminance components,

* tables 1 for chrominance components.

*/

cinfo->jpeg_color_space = colorspace;

cinfo->write_JFIF_header = FALSE; /* No marker for non-JFIF colorspaces */

cinfo->write_Adobe_marker = FALSE; /* write no Adobe marker by default */

switch (colorspace) {

case JCS_GRAYSCALE:

cinfo->write_JFIF_header = TRUE; /* Write a JFIF marker */

cinfo->num_components = 1;

/* JFIF specifies component ID 1 */

SET_COMP(0, 1, 1,1, 0, 0,0);

break;

case JCS_RGB:

cinfo->write_Adobe_marker = TRUE; /* write Adobe marker to flag RGB */

cinfo->num_components = 3;

SET_COMP(0, 0x52 /* 'R' */, 1,1, 0, 0,0);

SET_COMP(1, 0x47 /* 'G' */, 1,1, 0, 0,0);

SET_COMP(2, 0x42 /* 'B' */, 1,1, 0, 0,0);

break;

case JCS_YCbCr:

cinfo->write_JFIF_header = TRUE; /* Write a JFIF marker */

cinfo->num_components = 3;

/* JFIF specifies component IDs 1,2,3 */

/* We default to 2x2 subsamples of chrominance */

SET_COMP(0, 1, 2,2, 0, 0,0);

SET_COMP(1, 2, 1,1, 1, 1,1);

SET_COMP(2, 3, 1,1, 1, 1,1);

break;

case JCS_CMYK:

cinfo->write_Adobe_marker = TRUE; /* write Adobe marker to flag CMYK */

cinfo->num_components = 4;

SET_COMP(0, 0x43 /* 'C' */, 1,1, 0, 0,0);

SET_COMP(1, 0x4D /* 'M' */, 1,1, 0, 0,0);

SET_COMP(2, 0x59 /* 'Y' */, 1,1, 0, 0,0);

SET_COMP(3, 0x4B /* 'K' */, 1,1, 0, 0,0);

break;

case JCS_YCCK:

cinfo->write_Adobe_marker = TRUE; /* write Adobe marker to flag YCCK */

cinfo->num_components = 4;

SET_COMP(0, 1, 2,2, 0, 0,0);

SET_COMP(1, 2, 1,1, 1, 1,1);

SET_COMP(2, 3, 1,1, 1, 1,1);

SET_COMP(3, 4, 2,2, 0, 0,0);

break;

case JCS_UNKNOWN:

cinfo->num_components = cinfo->input_components;

if (cinfo->num_components < 1 || cinfo->num_components > MAX_COMPONENTS)

ERREXIT2(cinfo, JERR_COMPONENT_COUNT, cinfo->num_components,

MAX_COMPONENTS);

for (ci = 0; ci < cinfo->num_components; ci++) {

SET_COMP(ci, ci, 1,1, 0, 0,0);

}

break;

default:

ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);

}

}

#ifdef C_PROGRESSIVE_SUPPORTED

LOCAL(jpeg_scan_info *)

fill_a_scan (jpeg_scan_info * scanptr, int ci,

int Ss, int Se, int Ah, int Al)

/* Support routine: generate one scan for specified component */

{

scanptr->comps_in_scan = 1;

scanptr->component_index[0] = ci;

scanptr->Ss = Ss;

scanptr->Se = Se;

scanptr->Ah = Ah;

scanptr->Al = Al;

scanptr++;

return scanptr;

}

LOCAL(jpeg_scan_info *)

fill_a_scan_pair (jpeg_scan_info * scanptr, int ci,

int Ss, int Se, int Ah, int Al)

/* Support routine: generate one scan for pair of components */

{

scanptr->comps_in_scan = 2;

scanptr->component_index[0] = ci;

scanptr->component_index[1] = ci + 1;

scanptr->Ss = Ss;

scanptr->Se = Se;

scanptr->Ah = Ah;

scanptr->Al = Al;

scanptr++;

return scanptr;

}

LOCAL(jpeg_scan_info *)

fill_scans (jpeg_scan_info * scanptr, int ncomps,

int Ss, int Se, int Ah, int Al)

/* Support routine: generate one scan for each component */

{

int ci;

for (ci = 0; ci < ncomps; ci++) {

scanptr->comps_in_scan = 1;

scanptr->component_index[0] = ci;

scanptr->Ss = Ss;

scanptr->Se = Se;

scanptr->Ah = Ah;

scanptr->Al = Al;

scanptr++;

}

return scanptr;

}

LOCAL(jpeg_scan_info *)

fill_dc_scans (jpeg_scan_info * scanptr, int ncomps, int Ah, int Al)

/* Support routine: generate interleaved DC scan if possible, else N scans */

{

int ci;

if (ncomps <= MAX_COMPS_IN_SCAN) {

/* Single interleaved DC scan */

scanptr->comps_in_scan = ncomps;

for (ci = 0; ci < ncomps; ci++)

scanptr->component_index[ci] = ci;

scanptr->Ss = scanptr->Se = 0;

scanptr->Ah = Ah;

scanptr->Al = Al;

scanptr++;

} else {

/* Noninterleaved DC scan for each component */

scanptr = fill_scans(scanptr, ncomps, 0, 0, Ah, Al);

}

return scanptr;

}

/*

* List of scans to be tested

* cinfo->num_components and cinfo->jpeg_color_space must be correct.

*/

LOCAL(boolean)

jpeg_search_progression (j_compress_ptr cinfo)

{

int ncomps = cinfo->num_components;

int nscans;

jpeg_scan_info * scanptr;

int Al;

int frequency_split[] = { 2, 8, 5, 12, 18 };

int i;

/* Safety check to ensure start_compress not called yet. */

if (cinfo->global_state != CSTATE_START)

ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);

/* Figure space needed for script. Calculation must match code below! */

if (ncomps == 3 && cinfo->jpeg_color_space == JCS_YCbCr) {

/* Custom script for YCbCr color images. */

nscans = 64;

} else if (ncomps == 1) {

nscans = 23;

} else {

cinfo->num_scans_luma = 0;

return FALSE;

}

/* Allocate space for script.

* We need to put it in the permanent pool in case the application performs

* multiple compressions without changing the settings. To avoid a memory

* leak if jpeg_simple_progression is called repeatedly for the same JPEG

* object, we try to re-use previously allocated space, and we allocate

* enough space to handle YCbCr even if initially asked for grayscale.

*/

if (cinfo->script_space == NULL || cinfo->script_space_size < nscans) {

cinfo->script_space_size = MAX(nscans, 64);

cinfo->script_space = (jpeg_scan_info *)

(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,

cinfo->script_space_size * SIZEOF(jpeg_scan_info));

}

scanptr = cinfo->script_space;

cinfo->scan_info = scanptr;

cinfo->num_scans = nscans;

cinfo->Al_max_luma = 3;

cinfo->num_scans_luma_dc = 1;

cinfo->num_frequency_splits = 5;

cinfo->num_scans_luma = cinfo->num_scans_luma_dc + (3 * cinfo->Al_max_luma + 2) + (2 * cinfo->num_frequency_splits + 1);

/* 23 scans for luma */

/* 1 scan for DC */

/* 11 scans to determine successive approximation */

/* 11 scans to determine frequency approximation */

/* after 12 scans need to update following 11 */

/* after 23 scans need to determine which to keep */

/* last 4 done conditionally */

/* luma DC by itself */

if (cinfo->one_dc_scan)

scanptr = fill_dc_scans(scanptr, ncomps, 0, 0);

else

scanptr = fill_dc_scans(scanptr, 1, 0, 0);

scanptr = fill_a_scan(scanptr, 0, 1, 8, 0, 0);

scanptr = fill_a_scan(scanptr, 0, 9, 63, 0, 0);

for (Al = 0; Al < cinfo->Al_max_luma; Al++) {

scanptr = fill_a_scan(scanptr, 0, 1, 63, Al+1, Al);

scanptr = fill_a_scan(scanptr, 0, 1, 8, 0, Al+1);

scanptr = fill_a_scan(scanptr, 0, 9, 63, 0, Al+1);

}

scanptr = fill_a_scan(scanptr, 0, 1, 63, 0, 0);

for (i = 0; i < cinfo->num_frequency_splits; i++) {

scanptr = fill_a_scan(scanptr, 0, 1, frequency_split[i], 0, 0);

scanptr = fill_a_scan(scanptr, 0, frequency_split[i]+1, 63, 0, 0);

}

if (ncomps == 1) {

cinfo->Al_max_chroma = 0;

cinfo->num_scans_chroma_dc = 0;

} else {

cinfo->Al_max_chroma = 2;

cinfo->num_scans_chroma_dc = 3;

/* 41 scans for chroma */

/* chroma DC combined */

scanptr = fill_a_scan_pair(scanptr, 1, 0, 0, 0, 0);

/* chroma DC separate */

scanptr = fill_a_scan(scanptr, 1, 0, 0, 0, 0);

scanptr = fill_a_scan(scanptr, 2, 0, 0, 0, 0);

scanptr = fill_a_scan(scanptr, 1, 1, 8, 0, 0);

scanptr = fill_a_scan(scanptr, 1, 9, 63, 0, 0);

scanptr = fill_a_scan(scanptr, 2, 1, 8, 0, 0);

scanptr = fill_a_scan(scanptr, 2, 9, 63, 0, 0);

for (Al = 0; Al < cinfo->Al_max_chroma; Al++) {

scanptr = fill_a_scan(scanptr, 1, 1, 63, Al+1, Al);

scanptr = fill_a_scan(scanptr, 2, 1, 63, Al+1, Al);

scanptr = fill_a_scan(scanptr, 1, 1, 8, 0, Al+1);

scanptr = fill_a_scan(scanptr, 1, 9, 63, 0, Al+1);

scanptr = fill_a_scan(scanptr, 2, 1, 8, 0, Al+1);

scanptr = fill_a_scan(scanptr, 2, 9, 63, 0, Al+1);

}

scanptr = fill_a_scan(scanptr, 1, 1, 63, 0, 0);

scanptr = fill_a_scan(scanptr, 2, 1, 63, 0, 0);

for (i = 0; i < cinfo->num_frequency_splits; i++) {

scanptr = fill_a_scan(scanptr, 1, 1, frequency_split[i], 0, 0);

scanptr = fill_a_scan(scanptr, 1, frequency_split[i]+1, 63, 0, 0);

scanptr = fill_a_scan(scanptr, 2, 1, frequency_split[i], 0, 0);

scanptr = fill_a_scan(scanptr, 2, frequency_split[i]+1, 63, 0, 0);

}

}

return TRUE;

}

/*

* Create a recommended progressive-JPEG script.

* cinfo->num_components and cinfo->jpeg_color_space must be correct.

*/

GLOBAL(void)

jpeg_simple_progression (j_compress_ptr cinfo)

{

int ncomps;

int nscans;

jpeg_scan_info * scanptr;

if (cinfo->optimize_scans) {

if (jpeg_search_progression(cinfo) == TRUE)

return;

}

/* Safety check to ensure start_compress not called yet. */

if (cinfo->global_state != CSTATE_START)

ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);

/* Figure space needed for script. Calculation must match code below! */

ncomps = cinfo->num_components;

if (ncomps == 3 && cinfo->jpeg_color_space == JCS_YCbCr) {

/* Custom script for YCbCr color images. */

nscans = 10;

} else {

/* All-purpose script for other color spaces. */

if (cinfo->use_moz_defaults == TRUE) {

if (ncomps > MAX_COMPS_IN_SCAN)

nscans = 5 * ncomps; /* 2 DC + 4 AC scans per component */

else

nscans = 1 + 4 * ncomps; /* 2 DC scans; 4 AC scans per component */

} else {

if (ncomps > MAX_COMPS_IN_SCAN)

nscans = 6 * ncomps; /* 2 DC + 4 AC scans per component */

else

nscans = 2 + 4 * ncomps; /* 2 DC scans; 4 AC scans per component */

}

}

/* Allocate space for script.

* We need to put it in the permanent pool in case the application performs

* multiple compressions without changing the settings. To avoid a memory

* leak if jpeg_simple_progression is called repeatedly for the same JPEG

* object, we try to re-use previously allocated space, and we allocate

* enough space to handle YCbCr even if initially asked for grayscale.

*/

if (cinfo->script_space == NULL || cinfo->script_space_size < nscans) {

cinfo->script_space_size = MAX(nscans, 10);

cinfo->script_space = (jpeg_scan_info *)

(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,

cinfo->script_space_size * SIZEOF(jpeg_scan_info));

}

scanptr = cinfo->script_space;

cinfo->scan_info = scanptr;

cinfo->num_scans = nscans;

if (ncomps == 3 && cinfo->jpeg_color_space == JCS_YCbCr) {

/* Custom script for YCbCr color images. */

if (cinfo->use_moz_defaults == TRUE) {

/* scan defined in jpeg_scan_rgb.txt in jpgcrush */

/* Initial DC scan */

if (cinfo->one_dc_scan)

scanptr = fill_dc_scans(scanptr, ncomps, 0, 0);

else {

scanptr = fill_dc_scans(scanptr, 1, 0, 0);

scanptr = fill_a_scan_pair(scanptr, 1, 0, 0, 0, 0);

}

/* Low frequency AC scans */

scanptr = fill_a_scan(scanptr, 0, 1, 8, 0, 2);

scanptr = fill_a_scan(scanptr, 1, 1, 8, 0, 0);

scanptr = fill_a_scan(scanptr, 2, 1, 8, 0, 0);

/* Complete spectral selection for luma AC */

scanptr = fill_a_scan(scanptr, 0, 9, 63, 0, 2);

/* Finish luma AC successive approximation */

scanptr = fill_a_scan(scanptr, 0, 1, 63, 2, 1);

scanptr = fill_a_scan(scanptr, 0, 1, 63, 1, 0);

/* Complete spectral selection for chroma AC */

scanptr = fill_a_scan(scanptr, 1, 9, 63, 0, 0);

scanptr = fill_a_scan(scanptr, 2, 9, 63, 0, 0);

} else {

/* Initial DC scan */

scanptr = fill_dc_scans(scanptr, ncomps, 0, 1);

/* Initial AC scan: get some luma data out in a hurry */

scanptr = fill_a_scan(scanptr, 0, 1, 5, 0, 2);

/* Chroma data is too small to be worth expending many scans on */

scanptr = fill_a_scan(scanptr, 2, 1, 63, 0, 1);

scanptr = fill_a_scan(scanptr, 1, 1, 63, 0, 1);

/* Complete spectral selection for luma AC */

scanptr = fill_a_scan(scanptr, 0, 6, 63, 0, 2);

/* Refine next bit of luma AC */

scanptr = fill_a_scan(scanptr, 0, 1, 63, 2, 1);

/* Finish DC successive approximation */

scanptr = fill_dc_scans(scanptr, ncomps, 1, 0);

/* Finish AC successive approximation */

scanptr = fill_a_scan(scanptr, 2, 1, 63, 1, 0);

scanptr = fill_a_scan(scanptr, 1, 1, 63, 1, 0);

/* Luma bottom bit comes last since it's usually largest scan */

scanptr = fill_a_scan(scanptr, 0, 1, 63, 1, 0);

}

} else {

/* All-purpose script for other color spaces. */

if (cinfo->use_moz_defaults == TRUE) {

/* scan defined in jpeg_scan_bw.txt in jpgcrush */

/* DC component, no successive approximation */

scanptr = fill_dc_scans(scanptr, ncomps, 0, 0);

/* Successive approximation first pass */

scanptr = fill_scans(scanptr, ncomps, 1, 8, 0, 2);

scanptr = fill_scans(scanptr, ncomps, 9, 63, 0, 2);

/* Successive approximation second pass */

scanptr = fill_scans(scanptr, ncomps, 1, 63, 2, 1);

/* Successive approximation final pass */

scanptr = fill_scans(scanptr, ncomps, 1, 63, 1, 0);

} else {

/* Successive approximation first pass */

scanptr = fill_dc_scans(scanptr, ncomps, 0, 1);

scanptr = fill_scans(scanptr, ncomps, 1, 5, 0, 2);

scanptr = fill_scans(scanptr, ncomps, 6, 63, 0, 2);

/* Successive approximation second pass */

scanptr = fill_scans(scanptr, ncomps, 1, 63, 2, 1);

/* Successive approximation final pass */

scanptr = fill_dc_scans(scanptr, ncomps, 1, 0);

scanptr = fill_scans(scanptr, ncomps, 1, 63, 1, 0);

}

}

}

#endif /* C_PROGRESSIVE_SUPPORTED */