#if !defined(_FX_JPEG_TURBO_) | |
/* | |
* jctrans.c | |
* | |
* Copyright (C) 1995-1998, Thomas G. Lane. | |
* This file is part of the Independent JPEG Group's software. | |
* For conditions of distribution and use, see the accompanying README file. | |
* | |
* This file contains library routines for transcoding compression, | |
* that is, writing raw DCT coefficient arrays to an output JPEG file. | |
* The routines in jcapimin.c will also be needed by a transcoder. | |
*/ | |
#define JPEG_INTERNALS | |
#include "jinclude.h" | |
#include "jpeglib.h" | |
/* Forward declarations */ | |
LOCAL(void) transencode_master_selection | |
JPP((j_compress_ptr cinfo, jvirt_barray_ptr * coef_arrays)); | |
LOCAL(void) transencode_coef_controller | |
JPP((j_compress_ptr cinfo, jvirt_barray_ptr * coef_arrays)); | |
/* | |
* Compression initialization for writing raw-coefficient data. | |
* Before calling this, all parameters and a data destination must be set up. | |
* Call jpeg_finish_compress() to actually write the data. | |
* | |
* The number of passed virtual arrays must match cinfo->num_components. | |
* Note that the virtual arrays need not be filled or even realized at | |
* the time write_coefficients is called; indeed, if the virtual arrays | |
* were requested from this compression object's memory manager, they | |
* typically will be realized during this routine and filled afterwards. | |
*/ | |
GLOBAL(void) | |
jpeg_write_coefficients (j_compress_ptr cinfo, jvirt_barray_ptr * coef_arrays) | |
{ | |
if (cinfo->global_state != CSTATE_START) | |
ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state); | |
/* Mark all tables to be written */ | |
jpeg_suppress_tables(cinfo, FALSE); | |
/* (Re)initialize error mgr and destination modules */ | |
(*cinfo->err->reset_error_mgr) ((j_common_ptr) cinfo); | |
(*cinfo->dest->init_destination) (cinfo); | |
/* Perform master selection of active modules */ | |
transencode_master_selection(cinfo, coef_arrays); | |
/* Wait for jpeg_finish_compress() call */ | |
cinfo->next_scanline = 0; /* so jpeg_write_marker works */ | |
cinfo->global_state = CSTATE_WRCOEFS; | |
} | |
/* | |
* Initialize the compression object with default parameters, | |
* then copy from the source object all parameters needed for lossless | |
* transcoding. Parameters that can be varied without loss (such as | |
* scan script and Huffman optimization) are left in their default states. | |
*/ | |
GLOBAL(void) | |
jpeg_copy_critical_parameters (j_decompress_ptr srcinfo, | |
j_compress_ptr dstinfo) | |
{ | |
JQUANT_TBL ** qtblptr; | |
jpeg_component_info *incomp, *outcomp; | |
JQUANT_TBL *c_quant, *slot_quant; | |
int tblno, ci, coefi; | |
/* Safety check to ensure start_compress not called yet. */ | |
if (dstinfo->global_state != CSTATE_START) | |
ERREXIT1(dstinfo, JERR_BAD_STATE, dstinfo->global_state); | |
/* Copy fundamental image dimensions */ | |
dstinfo->image_width = srcinfo->image_width; | |
dstinfo->image_height = srcinfo->image_height; | |
dstinfo->input_components = srcinfo->num_components; | |
dstinfo->in_color_space = srcinfo->jpeg_color_space; | |
/* Initialize all parameters to default values */ | |
jpeg_set_defaults(dstinfo); | |
/* jpeg_set_defaults may choose wrong colorspace, eg YCbCr if input is RGB. | |
* Fix it to get the right header markers for the image colorspace. | |
*/ | |
jpeg_set_colorspace(dstinfo, srcinfo->jpeg_color_space); | |
dstinfo->data_precision = srcinfo->data_precision; | |
dstinfo->CCIR601_sampling = srcinfo->CCIR601_sampling; | |
/* Copy the source's quantization tables. */ | |
for (tblno = 0; tblno < NUM_QUANT_TBLS; tblno++) { | |
if (srcinfo->quant_tbl_ptrs[tblno] != NULL) { | |
qtblptr = & dstinfo->quant_tbl_ptrs[tblno]; | |
if (*qtblptr == NULL) | |
*qtblptr = jpeg_alloc_quant_table((j_common_ptr) dstinfo); | |
MEMCOPY((*qtblptr)->quantval, | |
srcinfo->quant_tbl_ptrs[tblno]->quantval, | |
SIZEOF((*qtblptr)->quantval)); | |
(*qtblptr)->sent_table = FALSE; | |
} | |
} | |
/* Copy the source's per-component info. | |
* Note we assume jpeg_set_defaults has allocated the dest comp_info array. | |
*/ | |
dstinfo->num_components = srcinfo->num_components; | |
if (dstinfo->num_components < 1 || dstinfo->num_components > MAX_COMPONENTS) | |
ERREXIT2(dstinfo, JERR_COMPONENT_COUNT, dstinfo->num_components, | |
MAX_COMPONENTS); | |
for (ci = 0, incomp = srcinfo->comp_info, outcomp = dstinfo->comp_info; | |
ci < dstinfo->num_components; ci++, incomp++, outcomp++) { | |
outcomp->component_id = incomp->component_id; | |
outcomp->h_samp_factor = incomp->h_samp_factor; | |
outcomp->v_samp_factor = incomp->v_samp_factor; | |
outcomp->quant_tbl_no = incomp->quant_tbl_no; | |
/* Make sure saved quantization table for component matches the qtable | |
* slot. If not, the input file re-used this qtable slot. | |
* IJG encoder currently cannot duplicate this. | |
*/ | |
tblno = outcomp->quant_tbl_no; | |
if (tblno < 0 || tblno >= NUM_QUANT_TBLS || | |
srcinfo->quant_tbl_ptrs[tblno] == NULL) | |
ERREXIT1(dstinfo, JERR_NO_QUANT_TABLE, tblno); | |
slot_quant = srcinfo->quant_tbl_ptrs[tblno]; | |
c_quant = incomp->quant_table; | |
if (c_quant != NULL) { | |
for (coefi = 0; coefi < DCTSIZE2; coefi++) { | |
if (c_quant->quantval[coefi] != slot_quant->quantval[coefi]) | |
ERREXIT1(dstinfo, JERR_MISMATCHED_QUANT_TABLE, tblno); | |
} | |
} | |
/* Note: we do not copy the source's Huffman table assignments; | |
* instead we rely on jpeg_set_colorspace to have made a suitable choice. | |
*/ | |
} | |
/* Also copy JFIF version and resolution information, if available. | |
* Strictly speaking this isn't "critical" info, but it's nearly | |
* always appropriate to copy it if available. In particular, | |
* if the application chooses to copy JFIF 1.02 extension markers from | |
* the source file, we need to copy the version to make sure we don't | |
* emit a file that has 1.02 extensions but a claimed version of 1.01. | |
* We will *not*, however, copy version info from mislabeled "2.01" files. | |
*/ | |
if (srcinfo->saw_JFIF_marker) { | |
if (srcinfo->JFIF_major_version == 1) { | |
dstinfo->JFIF_major_version = srcinfo->JFIF_major_version; | |
dstinfo->JFIF_minor_version = srcinfo->JFIF_minor_version; | |
} | |
dstinfo->density_unit = srcinfo->density_unit; | |
dstinfo->X_density = srcinfo->X_density; | |
dstinfo->Y_density = srcinfo->Y_density; | |
} | |
} | |
/* | |
* Master selection of compression modules for transcoding. | |
* This substitutes for jcinit.c's initialization of the full compressor. | |
*/ | |
LOCAL(void) | |
transencode_master_selection (j_compress_ptr cinfo, | |
jvirt_barray_ptr * coef_arrays) | |
{ | |
/* Although we don't actually use input_components for transcoding, | |
* jcmaster.c's initial_setup will complain if input_components is 0. | |
*/ | |
cinfo->input_components = 1; | |
/* Initialize master control (includes parameter checking/processing) */ | |
jinit_c_master_control(cinfo, TRUE /* transcode only */); | |
/* Entropy encoding: either Huffman or arithmetic coding. */ | |
if (cinfo->arith_code) { | |
ERREXIT(cinfo, JERR_ARITH_NOTIMPL); | |
} else { | |
if (cinfo->progressive_mode) { | |
#ifdef C_PROGRESSIVE_SUPPORTED | |
jinit_phuff_encoder(cinfo); | |
#else | |
ERREXIT(cinfo, JERR_NOT_COMPILED); | |
#endif | |
} else | |
jinit_huff_encoder(cinfo); | |
} | |
/* We need a special coefficient buffer controller. */ | |
transencode_coef_controller(cinfo, coef_arrays); | |
jinit_marker_writer(cinfo); | |
/* We can now tell the memory manager to allocate virtual arrays. */ | |
(*cinfo->mem->realize_virt_arrays) ((j_common_ptr) cinfo); | |
/* Write the datastream header (SOI, JFIF) immediately. | |
* Frame and scan headers are postponed till later. | |
* This lets application insert special markers after the SOI. | |
*/ | |
(*cinfo->marker->write_file_header) (cinfo); | |
} | |
/* | |
* The rest of this file is a special implementation of the coefficient | |
* buffer controller. This is similar to jccoefct.c, but it handles only | |
* output from presupplied virtual arrays. Furthermore, we generate any | |
* dummy padding blocks on-the-fly rather than expecting them to be present | |
* in the arrays. | |
*/ | |
/* Private buffer controller object */ | |
typedef struct { | |
struct jpeg_c_coef_controller pub; /* public fields */ | |
JDIMENSION iMCU_row_num; /* iMCU row # within image */ | |
JDIMENSION mcu_ctr; /* counts MCUs processed in current row */ | |
int MCU_vert_offset; /* counts MCU rows within iMCU row */ | |
int MCU_rows_per_iMCU_row; /* number of such rows needed */ | |
/* Virtual block array for each component. */ | |
jvirt_barray_ptr * whole_image; | |
/* Workspace for constructing dummy blocks at right/bottom edges. */ | |
JBLOCKROW dummy_buffer[C_MAX_BLOCKS_IN_MCU]; | |
} my_coef_controller; | |
typedef my_coef_controller * my_coef_ptr; | |
LOCAL(void) | |
start_iMCU_row (j_compress_ptr cinfo) | |
/* Reset within-iMCU-row counters for a new row */ | |
{ | |
my_coef_ptr coef = (my_coef_ptr) cinfo->coef; | |
/* In an interleaved scan, an MCU row is the same as an iMCU row. | |
* In a noninterleaved scan, an iMCU row has v_samp_factor MCU rows. | |
* But at the bottom of the image, process only what's left. | |
*/ | |
if (cinfo->comps_in_scan > 1) { | |
coef->MCU_rows_per_iMCU_row = 1; | |
} else { | |
if (coef->iMCU_row_num < (cinfo->total_iMCU_rows-1)) | |
coef->MCU_rows_per_iMCU_row = cinfo->cur_comp_info[0]->v_samp_factor; | |
else | |
coef->MCU_rows_per_iMCU_row = cinfo->cur_comp_info[0]->last_row_height; | |
} | |
coef->mcu_ctr = 0; | |
coef->MCU_vert_offset = 0; | |
} | |
/* | |
* Initialize for a processing pass. | |
*/ | |
METHODDEF(void) | |
start_pass_coef (j_compress_ptr cinfo, J_BUF_MODE pass_mode) | |
{ | |
my_coef_ptr coef = (my_coef_ptr) cinfo->coef; | |
if (pass_mode != JBUF_CRANK_DEST) | |
ERREXIT(cinfo, JERR_BAD_BUFFER_MODE); | |
coef->iMCU_row_num = 0; | |
start_iMCU_row(cinfo); | |
} | |
/* | |
* Process some data. | |
* We process the equivalent of one fully interleaved MCU row ("iMCU" row) | |
* per call, ie, v_samp_factor block rows for each component in the scan. | |
* The data is obtained from the virtual arrays and fed to the entropy coder. | |
* Returns TRUE if the iMCU row is completed, FALSE if suspended. | |
* | |
* NB: input_buf is ignored; it is likely to be a NULL pointer. | |
*/ | |
METHODDEF(boolean) | |
compress_output (j_compress_ptr cinfo, JSAMPIMAGE input_buf) | |
{ | |
my_coef_ptr coef = (my_coef_ptr) cinfo->coef; | |
JDIMENSION MCU_col_num; /* index of current MCU within row */ | |
JDIMENSION last_MCU_col = cinfo->MCUs_per_row - 1; | |
JDIMENSION last_iMCU_row = cinfo->total_iMCU_rows - 1; | |
int blkn, ci, xindex, yindex, yoffset, blockcnt; | |
JDIMENSION start_col; | |
JBLOCKARRAY buffer[MAX_COMPS_IN_SCAN]; | |
JBLOCKROW MCU_buffer[C_MAX_BLOCKS_IN_MCU]; | |
JBLOCKROW buffer_ptr; | |
jpeg_component_info *compptr; | |
/* Align the virtual buffers for the components used in this scan. */ | |
for (ci = 0; ci < cinfo->comps_in_scan; ci++) { | |
compptr = cinfo->cur_comp_info[ci]; | |
buffer[ci] = (*cinfo->mem->access_virt_barray) | |
((j_common_ptr) cinfo, coef->whole_image[compptr->component_index], | |
coef->iMCU_row_num * compptr->v_samp_factor, | |
(JDIMENSION) compptr->v_samp_factor, FALSE); | |
} | |
/* Loop to process one whole iMCU row */ | |
for (yoffset = coef->MCU_vert_offset; yoffset < coef->MCU_rows_per_iMCU_row; | |
yoffset++) { | |
for (MCU_col_num = coef->mcu_ctr; MCU_col_num < cinfo->MCUs_per_row; | |
MCU_col_num++) { | |
/* Construct list of pointers to DCT blocks belonging to this MCU */ | |
blkn = 0; /* index of current DCT block within MCU */ | |
for (ci = 0; ci < cinfo->comps_in_scan; ci++) { | |
compptr = cinfo->cur_comp_info[ci]; | |
start_col = MCU_col_num * compptr->MCU_width; | |
blockcnt = (MCU_col_num < last_MCU_col) ? compptr->MCU_width | |
: compptr->last_col_width; | |
for (yindex = 0; yindex < compptr->MCU_height; yindex++) { | |
if (coef->iMCU_row_num < last_iMCU_row || | |
yindex+yoffset < compptr->last_row_height) { | |
/* Fill in pointers to real blocks in this row */ | |
buffer_ptr = buffer[ci][yindex+yoffset] + start_col; | |
for (xindex = 0; xindex < blockcnt; xindex++) | |
MCU_buffer[blkn++] = buffer_ptr++; | |
} else { | |
/* At bottom of image, need a whole row of dummy blocks */ | |
xindex = 0; | |
} | |
/* Fill in any dummy blocks needed in this row. | |
* Dummy blocks are filled in the same way as in jccoefct.c: | |
* all zeroes in the AC entries, DC entries equal to previous | |
* block's DC value. The init routine has already zeroed the | |
* AC entries, so we need only set the DC entries correctly. | |
*/ | |
for (; xindex < compptr->MCU_width; xindex++) { | |
MCU_buffer[blkn] = coef->dummy_buffer[blkn]; | |
MCU_buffer[blkn][0][0] = MCU_buffer[blkn-1][0][0]; | |
blkn++; | |
} | |
} | |
} | |
/* Try to write the MCU. */ | |
if (! (*cinfo->entropy->encode_mcu) (cinfo, MCU_buffer)) { | |
/* Suspension forced; update state counters and exit */ | |
coef->MCU_vert_offset = yoffset; | |
coef->mcu_ctr = MCU_col_num; | |
return FALSE; | |
} | |
} | |
/* Completed an MCU row, but perhaps not an iMCU row */ | |
coef->mcu_ctr = 0; | |
} | |
/* Completed the iMCU row, advance counters for next one */ | |
coef->iMCU_row_num++; | |
start_iMCU_row(cinfo); | |
return TRUE; | |
} | |
/* | |
* Initialize coefficient buffer controller. | |
* | |
* Each passed coefficient array must be the right size for that | |
* coefficient: width_in_blocks wide and height_in_blocks high, | |
* with unitheight at least v_samp_factor. | |
*/ | |
LOCAL(void) | |
transencode_coef_controller (j_compress_ptr cinfo, | |
jvirt_barray_ptr * coef_arrays) | |
{ | |
my_coef_ptr coef; | |
JBLOCKROW buffer; | |
int i; | |
coef = (my_coef_ptr) | |
(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, | |
SIZEOF(my_coef_controller)); | |
cinfo->coef = (struct jpeg_c_coef_controller *) coef; | |
coef->pub.start_pass = start_pass_coef; | |
coef->pub.compress_data = compress_output; | |
/* Save pointer to virtual arrays */ | |
coef->whole_image = coef_arrays; | |
/* Allocate and pre-zero space for dummy DCT blocks. */ | |
buffer = (JBLOCKROW) | |
(*cinfo->mem->alloc_large) ((j_common_ptr) cinfo, JPOOL_IMAGE, | |
C_MAX_BLOCKS_IN_MCU * SIZEOF(JBLOCK)); | |
jzero_far((void FAR *) buffer, C_MAX_BLOCKS_IN_MCU * SIZEOF(JBLOCK)); | |
for (i = 0; i < C_MAX_BLOCKS_IN_MCU; i++) { | |
coef->dummy_buffer[i] = buffer + i; | |
} | |
} | |
#endif //_FX_JPEG_TURBO_ |