978 lines
42 KiB
C
978 lines
42 KiB
C
// * jpeglib.h
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// *
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// * Copyright (C) 1991-1995, Thomas G. Lane.
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// * This file is part of the Independent JPEG Group's software.
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// * For conditions of distribution and use, see the accompanying README file.
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// *
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// * This file defines the application interface for the JPEG library.
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// * Most applications using the library need only include this file,
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// * and perhaps jerror.h if they want to know the exact error codes.
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#ifndef JPEGLIB_H
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#define JPEGLIB_H
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// * First we include the configuration files that record how this
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// * installation of the JPEG library is set up. jconfig.h can be
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// * generated automatically for many systems. jmorecfg.h contains
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// * manual configuration options that most people need not worry about.
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#ifndef JCONFIG_INCLUDED // in case jinclude.h already did
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#include "JCONFIG.h" // widely used configuration options
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#endif
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#include "JMORECFG.h" // seldom changed options
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// Version ID for the JPEG library.
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// * Might be useful for tests like "#if JPEG_LIB_VERSION >= 60".
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#define JPEG_LIB_VERSION 60 // Version 6
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// Various constants determining the sizes of things.
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// * All of these are specified by the JPEG standard, so don't change them
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// * if you want to be compatible.
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#define DCTSIZE 8 // The basic DCT block is 8x8 samples
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#define DCTSIZE2 64 // DCTSIZE squared; # of elements in a block
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#define NUM_QUANT_TBLS 4 // Quantization tables are numbered 0..3
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#define NUM_HUFF_TBLS 4 // Huffman tables are numbered 0..3
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#define NUM_ARITH_TBLS 16 // Arith-coding tables are numbered 0..15
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#define MAX_COMPS_IN_SCAN 4 // JPEG limit on # of components in one scan
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#define MAX_SAMP_FACTOR 4 // JPEG limit on sampling factors
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// Unfortunately, some bozo at Adobe saw no reason to be bound by the standard;
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// * the PostScript DCT filter can emit files with many more than 10 blocks/MCU.
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// * If you happen to run across such a file, you can up D_MAX_BLOCKS_IN_MCU
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// * to handle it. We even let you do this from the jconfig.h file. However,
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// * we strongly discourage changing C_MAX_BLOCKS_IN_MCU; just because Adobe
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// * sometimes emits noncompliant files doesn't mean you should too.
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#define C_MAX_BLOCKS_IN_MCU 10 // compressor's limit on blocks per MCU
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#ifndef D_MAX_BLOCKS_IN_MCU
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#define D_MAX_BLOCKS_IN_MCU 10 // decompressor's limit on blocks per MCU
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#endif
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// This macro is used to declare a "method", that is, a function pointer.
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// * We want to supply prototype parameters if the compiler can cope.
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// * Note that the arglist parameter must be parenthesized!
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#ifdef HAVE_PROTOTYPES
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#define JMETHOD(type,methodname,arglist) type (*methodname) arglist
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#else
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#define JMETHOD(type,methodname,arglist) type (*methodname) ()
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#endif
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// Data structures for images (arrays of samples and of DCT coefficients).
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// * On 80x86 machines, the image arrays are too big for near pointers,
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// * but the pointer arrays can fit in near memory.
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typedef JSAMPLE FAR *JSAMPROW; // ptr to one image row of pixel samples.
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typedef JSAMPROW *JSAMPARRAY; // ptr to some rows (a 2-D sample array)
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typedef JSAMPARRAY *JSAMPIMAGE; // a 3-D sample array: top index is color
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typedef JCOEF JBLOCK[DCTSIZE2]; // one block of coefficients
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typedef JBLOCK FAR *JBLOCKROW; // pointer to one row of coefficient blocks
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typedef JBLOCKROW *JBLOCKARRAY; // a 2-D array of coefficient blocks
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typedef JBLOCKARRAY *JBLOCKIMAGE; // a 3-D array of coefficient blocks
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typedef JCOEF FAR *JCOEFPTR; // useful in a couple of places
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// Types for JPEG compression parameters and working tables.
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// DCT coefficient quantization tables.
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typedef struct {
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// This field directly represents the contents of a JPEG DQT marker.
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// * Note: the values are always given in zigzag order.
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UINT16 quantval[DCTSIZE2]; // quantization step for each coefficient
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// This field is used only during compression. It's initialized FALSE when
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// * the table is created, and set TRUE when it's been output to the file.
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// * You could suppress output of a table by setting this to TRUE.
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// * (See jpeg_suppress_tables for an example.)
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boolean sent_table; // TRUE when table has been output
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} JQUANT_TBL;
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// Huffman coding tables.
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typedef struct {
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// These two fields directly represent the contents of a JPEG DHT marker
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UINT8 bits[17]; // bits[k] = # of symbols with codes of
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// length k bits; bits[0] is unused
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UINT8 huffval[256]; // The symbols, in order of incr code length
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// This field is used only during compression. It's initialized FALSE when
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// * the table is created, and set TRUE when it's been output to the file.
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// * You could suppress output of a table by setting this to TRUE.
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// * (See jpeg_suppress_tables for an example.)
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boolean sent_table; // TRUE when table has been output
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} JHUFF_TBL;
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// Basic info about one component (color channel).
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typedef struct {
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// These values are fixed over the whole image.
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// For compression, they must be supplied by parameter setup;
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// for decompression, they are read from the SOF marker.
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int component_id; // identifier for this component (0..255)
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int component_index; // its index in SOF or cinfo->comp_info[]
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int h_samp_factor; // horizontal sampling factor (1..4)
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int v_samp_factor; // vertical sampling factor (1..4)
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int quant_tbl_no; // quantization table selector (0..3)
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// These values may vary between scans.
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// For compression, they must be supplied by parameter setup;
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// for decompression, they are read from the SOS marker.
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// The decompressor output side may not use these variables.
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int dc_tbl_no; // DC entropy table selector (0..3)
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int ac_tbl_no; // AC entropy table selector (0..3)
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// Remaining fields should be treated as private by applications.
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// These values are computed during compression or decompression startup:
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// Component's size in DCT blocks.
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// * Any dummy blocks added to complete an MCU are not counted; therefore
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// * these values do not depend on whether a scan is interleaved or not.
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JDIMENSION width_in_blocks;
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JDIMENSION height_in_blocks;
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// Size of a DCT block in samples. Always DCTSIZE for compression.
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// * For decompression this is the size of the output from one DCT block,
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// * reflecting any scaling we choose to apply during the IDCT step.
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// * Values of 1,2,4,8 are likely to be supported. Note that different
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// * components may receive different IDCT scalings.
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int DCT_scaled_size;
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// The downsampled dimensions are the component's actual, unpadded number
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// * of samples at the main buffer (preprocessing/compression interface), thus
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// * downsampled_width = ceil(image_width * Hi/Hmax)
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// * and similarly for height. For decompression, IDCT scaling is included, so
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// * downsampled_width = ceil(image_width * Hi/Hmax * DCT_scaled_size/DCTSIZE)
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JDIMENSION downsampled_width; // actual width in samples
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JDIMENSION downsampled_height; // actual height in samples
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// This flag is used only for decompression. In cases where some of the
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// * components will be ignored (eg grayscale output from YCbCr image),
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// * we can skip most computations for the unused components.
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boolean component_needed; // do we need the value of this component?
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// These values are computed before starting a scan of the component.
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// The decompressor output side may not use these variables.
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int MCU_width; // number of blocks per MCU, horizontally
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int MCU_height; // number of blocks per MCU, vertically
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int MCU_blocks; // MCU_width * MCU_height
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int MCU_sample_width; // MCU width in samples, MCU_width*DCT_scaled_size
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int last_col_width; // # of non-dummy blocks across in last MCU
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int last_row_height; // # of non-dummy blocks down in last MCU
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// Saved quantization table for component; NULL if none yet saved.
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// * See jdinput.c comments about the need for this information.
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// * This field is not currently used by the compressor.
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JQUANT_TBL * quant_table;
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// Private per-component storage for DCT or IDCT subsystem.
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void * dct_table;
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} jpeg_component_info;
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// The script for encoding a multiple-scan file is an array of these:
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typedef struct {
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int comps_in_scan; // number of components encoded in this scan
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int component_index[MAX_COMPS_IN_SCAN]; // their SOF/comp_info[] indexes
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int Ss, Se; // progressive JPEG spectral selection parms
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int Ah, Al; // progressive JPEG successive approx. parms
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} jpeg_scan_info;
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// Known color spaces.
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typedef enum {
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JCS_UNKNOWN, // error/unspecified
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JCS_GRAYSCALE, // monochrome
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JCS_RGB, // red/green/blue
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JCS_YCbCr, // Y/Cb/Cr (also known as YUV)
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JCS_CMYK, // C/M/Y/K
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JCS_YCCK // Y/Cb/Cr/K
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} J_COLOR_SPACE;
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// DCT/IDCT algorithm options.
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typedef enum {
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JDCT_ISLOW, // slow but accurate integer algorithm
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JDCT_IFAST, // faster, less accurate integer method
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JDCT_FLOAT // floating-point: accurate, fast on fast HW
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} J_DCT_METHOD;
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#ifndef JDCT_DEFAULT // may be overridden in jconfig.h
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#define JDCT_DEFAULT JDCT_ISLOW
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#endif
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#ifndef JDCT_FASTEST // may be overridden in jconfig.h
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#define JDCT_FASTEST JDCT_IFAST
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#endif
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// Dithering options for decompression.
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typedef enum {
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JDITHER_NONE, // no dithering
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JDITHER_ORDERED, // simple ordered dither
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JDITHER_FS // Floyd-Steinberg error diffusion dither
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} J_DITHER_MODE;
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// Common fields between JPEG compression and decompression master structs.
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#define jpeg_common_fields \
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struct jpeg_error_mgr * err; /* Error handler module */\
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struct jpeg_memory_mgr * mem; /* Memory manager module */\
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struct jpeg_progress_mgr * progress; /* Progress monitor, or NULL if none */\
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boolean is_decompressor; /* so common code can tell which is which */\
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int global_state // for checking call sequence validity
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// Routines that are to be used by both halves of the library are declared
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// * to receive a pointer to this structure. There are no actual instances of
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// * jpeg_common_struct, only of jpeg_compress_struct and jpeg_decompress_struct.
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struct jpeg_common_struct {
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jpeg_common_fields; // Fields common to both master struct types
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// Additional fields follow in an actual jpeg_compress_struct or
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// * jpeg_decompress_struct. All three structs must agree on these
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// * initial fields! (This would be a lot cleaner in C++.)
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};
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typedef struct jpeg_common_struct * j_common_ptr;
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typedef struct jpeg_compress_struct * j_compress_ptr;
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typedef struct jpeg_decompress_struct * j_decompress_ptr;
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// Master record for a compression instance
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struct jpeg_compress_struct {
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jpeg_common_fields; // Fields shared with jpeg_decompress_struct
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// Destination for compressed data
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struct jpeg_destination_mgr * dest;
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// Description of source image --- these fields must be filled in by
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// * outer application before starting compression. in_color_space must
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// * be correct before you can even call jpeg_set_defaults().
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JDIMENSION image_width; // input image width
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JDIMENSION image_height; // input image height
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int input_components; // # of color components in input image
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J_COLOR_SPACE in_color_space; // colorspace of input image
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double input_gamma; // image gamma of input image
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// Compression parameters --- these fields must be set before calling
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// * jpeg_start_compress(). We recommend calling jpeg_set_defaults() to
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// * initialize everything to reasonable defaults, then changing anything
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// * the application specifically wants to change. That way you won't get
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// * burnt when new parameters are added. Also note that there are several
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// * helper routines to simplify changing parameters.
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int data_precision; // bits of precision in image data
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int num_components; // # of color components in JPEG image
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J_COLOR_SPACE jpeg_color_space; // colorspace of JPEG image
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jpeg_component_info * comp_info;
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// comp_info[i] describes component that appears i'th in SOF
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JQUANT_TBL * quant_tbl_ptrs[NUM_QUANT_TBLS];
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// ptrs to coefficient quantization tables, or NULL if not defined
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JHUFF_TBL * dc_huff_tbl_ptrs[NUM_HUFF_TBLS];
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JHUFF_TBL * ac_huff_tbl_ptrs[NUM_HUFF_TBLS];
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// ptrs to Huffman coding tables, or NULL if not defined
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UINT8 arith_dc_L[NUM_ARITH_TBLS]; // L values for DC arith-coding tables
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UINT8 arith_dc_U[NUM_ARITH_TBLS]; // U values for DC arith-coding tables
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UINT8 arith_ac_K[NUM_ARITH_TBLS]; // Kx values for AC arith-coding tables
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int num_scans; // # of entries in scan_info array
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const jpeg_scan_info * scan_info; // script for multi-scan file, or NULL
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// The default value of scan_info is NULL, which causes a single-scan
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// * sequential JPEG file to be emitted. To create a multi-scan file,
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// * set num_scans and scan_info to point to an array of scan definitions.
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boolean raw_data_in; // TRUE=caller supplies downsampled data
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boolean arith_code; // TRUE=arithmetic coding, FALSE=Huffman
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boolean optimize_coding; // TRUE=optimize entropy encoding parms
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boolean CCIR601_sampling; // TRUE=first samples are cosited
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int smoothing_factor; // 1..100, or 0 for no input smoothing
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J_DCT_METHOD dct_method; // DCT algorithm selector
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// The restart interval can be specified in absolute MCUs by setting
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// * restart_interval, or in MCU rows by setting restart_in_rows
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// * (in which case the correct restart_interval will be figured
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// * for each scan).
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unsigned int restart_interval; // MCUs per restart, or 0 for no restart
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int restart_in_rows; // if > 0, MCU rows per restart interval
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// Parameters controlling emission of special markers.
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boolean write_JFIF_header; // should a JFIF marker be written?
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// These three values are not used by the JPEG code, merely copied
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// into the JFIF APP0 marker. density_unit can be 0 for unknown,
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// 1 for dots/inch, or 2 for dots/cm. Note that the pixel aspect
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// ratio is defined by X_density/Y_density even when density_unit=0.
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UINT8 density_unit; // JFIF code for pixel size units
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UINT16 X_density; // Horizontal pixel density
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UINT16 Y_density; // Vertical pixel density
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boolean write_Adobe_marker; // should an Adobe marker be written?
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// State variable: index of next scanline to be written to
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// * jpeg_write_scanlines(). Application may use this to control its
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// * processing loop, e.g., "while (next_scanline < image_height)".
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JDIMENSION next_scanline; // 0 .. image_height-1
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// Remaining fields are known throughout compressor, but generally
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// * should not be touched by a surrounding application.
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// * These fields are computed during compression startup
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boolean progressive_mode; // TRUE if scan script uses progressive mode
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int max_h_samp_factor; // largest h_samp_factor
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int max_v_samp_factor; // largest v_samp_factor
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JDIMENSION total_iMCU_rows; // # of iMCU rows to be input to coef ctlr
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// The coefficient controller receives data in units of MCU rows as defined
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// * for fully interleaved scans (whether the JPEG file is interleaved or not).
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// * There are v_samp_factor * DCTSIZE sample rows of each component in an
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// * "iMCU" (interleaved MCU) row.
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// * These fields are valid during any one scan.
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// * They describe the components and MCUs actually appearing in the scan.
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int comps_in_scan; // # of JPEG components in this scan
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jpeg_component_info * cur_comp_info[MAX_COMPS_IN_SCAN];
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// *cur_comp_info[i] describes component that appears i'th in SOS
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JDIMENSION MCUs_per_row; // # of MCUs across the image
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JDIMENSION MCU_rows_in_scan; // # of MCU rows in the image
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int blocks_in_MCU; // # of DCT blocks per MCU
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int MCU_membership[C_MAX_BLOCKS_IN_MCU];
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// MCU_membership[i] is index in cur_comp_info of component owning
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// i'th block in an MCU
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int Ss, Se, Ah, Al; // progressive JPEG parameters for scan
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// * Links to compression subobjects (methods and private variables of modules)
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struct jpeg_comp_master * master;
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struct jpeg_c_main_controller * main;
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struct jpeg_c_prep_controller * prep;
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struct jpeg_c_coef_controller * coef;
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struct jpeg_marker_writer * marker;
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struct jpeg_color_converter * cconvert;
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struct jpeg_downsampler * downsample;
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struct jpeg_forward_dct * fdct;
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struct jpeg_entropy_encoder * entropy;
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};
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// Master record for a decompression instance
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struct jpeg_decompress_struct {
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jpeg_common_fields; // Fields shared with jpeg_compress_struct
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// Source of compressed data
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struct jpeg_source_mgr * src;
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// Basic description of image --- filled in by jpeg_read_header().
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// Application may inspect these values to decide how to process image.
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JDIMENSION image_width; // nominal image width (from SOF marker)
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JDIMENSION image_height; // nominal image height
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int num_components; // # of color components in JPEG image
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J_COLOR_SPACE jpeg_color_space; // colorspace of JPEG image
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// Decompression processing parameters --- these fields must be set before
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// * calling jpeg_start_decompress(). Note that jpeg_read_header() initializes
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// * them to default values.
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J_COLOR_SPACE out_color_space; // colorspace for output
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unsigned int scale_num, scale_denom; // fraction by which to scale image
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double output_gamma; // image gamma wanted in output
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boolean buffered_image; // TRUE=multiple output passes
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boolean raw_data_out; // TRUE=downsampled data wanted
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J_DCT_METHOD dct_method; // IDCT algorithm selector
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boolean do_fancy_upsampling; // TRUE=apply fancy upsampling
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boolean do_block_smoothing; // TRUE=apply interblock smoothing
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boolean quantize_colors; // TRUE=colormapped output wanted
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// the following are ignored if not quantize_colors:
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J_DITHER_MODE dither_mode; // type of color dithering to use
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boolean two_pass_quantize; // TRUE=use two-pass color quantization
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int desired_number_of_colors; // max # colors to use in created colormap
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// these are significant only in buffered-image mode:
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boolean enable_1pass_quant; // enable future use of 1-pass quantizer
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boolean enable_external_quant;// enable future use of external colormap
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boolean enable_2pass_quant; // enable future use of 2-pass quantizer
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// Description of actual output image that will be returned to application.
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// * These fields are computed by jpeg_start_decompress().
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// * You can also use jpeg_calc_output_dimensions() to determine these values
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// * in advance of calling jpeg_start_decompress().
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JDIMENSION output_width; // scaled image width
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JDIMENSION output_height; // scaled image height
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int out_color_components; // # of color components in out_color_space
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int output_components; // # of color components returned
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// output_components is 1 (a colormap index) when quantizing colors;
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// * otherwise it equals out_color_components.
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int rec_outbuf_height; // min recommended height of scanline buffer
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// If the buffer passed to jpeg_read_scanlines() is less than this many rows
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// * high, space and time will be wasted due to unnecessary data copying.
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// * Usually rec_outbuf_height will be 1 or 2, at most 4.
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// When quantizing colors, the output colormap is described by these fields.
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// * The application can supply a colormap by setting colormap non-NULL before
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// * calling jpeg_start_decompress; otherwise a colormap is created during
|
|
// * jpeg_start_decompress or jpeg_start_output.
|
|
// * The map has out_color_components rows and actual_number_of_colors columns.
|
|
int actual_number_of_colors; // number of entries in use
|
|
JSAMPARRAY colormap; // The color map as a 2-D pixel array
|
|
|
|
// State variables: these variables indicate the progress of decompression.
|
|
// * The application may examine these but must not modify them.
|
|
|
|
// Row index of next scanline to be read from jpeg_read_scanlines().
|
|
// * Application may use this to control its processing loop, e.g.,
|
|
// * "while (output_scanline < output_height)".
|
|
JDIMENSION output_scanline; // 0 .. output_height-1
|
|
|
|
// Current input scan number and number of iMCU rows completed in scan.
|
|
// * These indicate the progress of the decompressor input side.
|
|
int input_scan_number; // Number of SOS markers seen so far
|
|
JDIMENSION input_iMCU_row; // Number of iMCU rows completed
|
|
|
|
// The "output scan number" is the notional scan being displayed by the
|
|
// * output side. The decompressor will not allow output scan/row number
|
|
// * to get ahead of input scan/row, but it can fall arbitrarily far behind.
|
|
int output_scan_number; // Nominal scan number being displayed
|
|
JDIMENSION output_iMCU_row; // Number of iMCU rows read
|
|
|
|
// Current progression status. coef_bits[c][i] indicates the precision
|
|
// * with which component c's DCT coefficient i (in zigzag order) is known.
|
|
// * It is -1 when no data has yet been received, otherwise it is the point
|
|
// * transform (shift) value for the most recent scan of the coefficient
|
|
// * (thus, 0 at completion of the progression).
|
|
// * This pointer is NULL when reading a non-progressive file.
|
|
int (*coef_bits)[DCTSIZE2]; // -1 or current Al value for each coef
|
|
|
|
// Internal JPEG parameters --- the application usually need not look at
|
|
// * these fields. Note that the decompressor output side may not use
|
|
// * any parameters that can change between scans.
|
|
|
|
// Quantization and Huffman tables are carried forward across input
|
|
// * datastreams when processing abbreviated JPEG datastreams.
|
|
|
|
JQUANT_TBL * quant_tbl_ptrs[NUM_QUANT_TBLS];
|
|
// ptrs to coefficient quantization tables, or NULL if not defined
|
|
|
|
JHUFF_TBL * dc_huff_tbl_ptrs[NUM_HUFF_TBLS];
|
|
JHUFF_TBL * ac_huff_tbl_ptrs[NUM_HUFF_TBLS];
|
|
// ptrs to Huffman coding tables, or NULL if not defined
|
|
|
|
// These parameters are never carried across datastreams, since they
|
|
// * are given in SOF/SOS markers or defined to be reset by SOI.
|
|
|
|
int data_precision; // bits of precision in image data
|
|
|
|
jpeg_component_info * comp_info;
|
|
// comp_info[i] describes component that appears i'th in SOF
|
|
|
|
boolean progressive_mode; // TRUE if SOFn specifies progressive mode
|
|
boolean arith_code; // TRUE=arithmetic coding, FALSE=Huffman
|
|
|
|
UINT8 arith_dc_L[NUM_ARITH_TBLS]; // L values for DC arith-coding tables
|
|
UINT8 arith_dc_U[NUM_ARITH_TBLS]; // U values for DC arith-coding tables
|
|
UINT8 arith_ac_K[NUM_ARITH_TBLS]; // Kx values for AC arith-coding tables
|
|
|
|
unsigned int restart_interval; // MCUs per restart interval, or 0 for no restart
|
|
|
|
// These fields record data obtained from optional markers recognized by
|
|
// * the JPEG library.
|
|
boolean saw_JFIF_marker; // TRUE iff a JFIF APP0 marker was found
|
|
// Data copied from JFIF marker:
|
|
UINT8 density_unit; // JFIF code for pixel size units
|
|
UINT16 X_density; // Horizontal pixel density
|
|
UINT16 Y_density; // Vertical pixel density
|
|
boolean saw_Adobe_marker; // TRUE iff an Adobe APP14 marker was found
|
|
UINT8 Adobe_transform; // Color transform code from Adobe marker
|
|
|
|
boolean CCIR601_sampling; // TRUE=first samples are cosited
|
|
|
|
// Remaining fields are known throughout decompressor, but generally
|
|
// * should not be touched by a surrounding application.
|
|
|
|
// * These fields are computed during decompression startup
|
|
int max_h_samp_factor; // largest h_samp_factor
|
|
int max_v_samp_factor; // largest v_samp_factor
|
|
|
|
int min_DCT_scaled_size; // smallest DCT_scaled_size of any component
|
|
|
|
JDIMENSION total_iMCU_rows; // # of iMCU rows in image
|
|
// The coefficient controller's input and output progress is measured in
|
|
// * units of "iMCU" (interleaved MCU) rows. These are the same as MCU rows
|
|
// * in fully interleaved JPEG scans, but are used whether the scan is
|
|
// * interleaved or not. We define an iMCU row as v_samp_factor DCT block
|
|
// * rows of each component. Therefore, the IDCT output contains
|
|
// * v_samp_factor*DCT_scaled_size sample rows of a component per iMCU row.
|
|
|
|
JSAMPLE * sample_range_limit; // table for fast range-limiting
|
|
|
|
// * These fields are valid during any one scan.
|
|
// * They describe the components and MCUs actually appearing in the scan.
|
|
// * Note that the decompressor output side must not use these fields.
|
|
int comps_in_scan; // # of JPEG components in this scan
|
|
jpeg_component_info * cur_comp_info[MAX_COMPS_IN_SCAN];
|
|
// *cur_comp_info[i] describes component that appears i'th in SOS
|
|
|
|
JDIMENSION MCUs_per_row; // # of MCUs across the image
|
|
JDIMENSION MCU_rows_in_scan; // # of MCU rows in the image
|
|
|
|
int blocks_in_MCU; // # of DCT blocks per MCU
|
|
int MCU_membership[D_MAX_BLOCKS_IN_MCU];
|
|
// MCU_membership[i] is index in cur_comp_info of component owning
|
|
// i'th block in an MCU
|
|
|
|
int Ss, Se, Ah, Al; // progressive JPEG parameters for scan
|
|
|
|
// This field is shared between entropy decoder and marker parser.
|
|
// * It is either zero or the code of a JPEG marker that has been
|
|
// * read from the data source, but has not yet been processed.
|
|
int unread_marker;
|
|
|
|
// * Links to decompression subobjects (methods, private variables of modules)
|
|
struct jpeg_decomp_master * master;
|
|
struct jpeg_d_main_controller * main;
|
|
struct jpeg_d_coef_controller * coef;
|
|
struct jpeg_d_post_controller * post;
|
|
struct jpeg_input_controller * inputctl;
|
|
struct jpeg_marker_reader * marker;
|
|
struct jpeg_entropy_decoder * entropy;
|
|
struct jpeg_inverse_dct * idct;
|
|
struct jpeg_upsampler * upsample;
|
|
struct jpeg_color_deconverter * cconvert;
|
|
struct jpeg_color_quantizer * cquantize;
|
|
};
|
|
|
|
|
|
// "Object" declarations for JPEG modules that may be supplied or called
|
|
// * directly by the surrounding application.
|
|
// * As with all objects in the JPEG library, these structs only define the
|
|
// * publicly visible methods and state variables of a module. Additional
|
|
// * private fields may exist after the public ones.
|
|
|
|
|
|
// Error handler object
|
|
|
|
struct jpeg_error_mgr {
|
|
// Error exit handler: does not return to caller
|
|
JMETHOD(void, error_exit, (j_common_ptr cinfo));
|
|
// Conditionally emit a trace or warning message
|
|
JMETHOD(void, emit_message, (j_common_ptr cinfo, int msg_level));
|
|
// Routine that actually outputs a trace or error message
|
|
JMETHOD(void, output_message, (j_common_ptr cinfo));
|
|
// Format a message string for the most recent JPEG error or message
|
|
JMETHOD(void, format_message, (j_common_ptr cinfo, char * buffer));
|
|
#define JMSG_LENGTH_MAX 200 // recommended size of format_message buffer
|
|
// Reset error state variables at start of a new image
|
|
JMETHOD(void, reset_error_mgr, (j_common_ptr cinfo));
|
|
|
|
// The message ID code and any parameters are saved here.
|
|
// * A message can have one string parameter or up to 8 int parameters.
|
|
int msg_code;
|
|
#define JMSG_STR_PARM_MAX 80
|
|
union {
|
|
int i[8];
|
|
char s[JMSG_STR_PARM_MAX];
|
|
} msg_parm;
|
|
|
|
// Standard state variables for error facility
|
|
|
|
int trace_level; // max msg_level that will be displayed
|
|
|
|
// For recoverable corrupt-data errors, we emit a warning message,
|
|
// * but keep going unless emit_message chooses to abort. emit_message
|
|
// * should count warnings in num_warnings. The surrounding application
|
|
// * can check for bad data by seeing if num_warnings is nonzero at the
|
|
// * end of processing.
|
|
LONG num_warnings; // number of corrupt-data warnings
|
|
|
|
// These fields point to the table(s) of error message strings.
|
|
// * An application can change the table pointer to switch to a different
|
|
// * message list (typically, to change the language in which errors are
|
|
// * reported). Some applications may wish to add additional error codes
|
|
// * that will be handled by the JPEG library error mechanism; the second
|
|
// * table pointer is used for this purpose.
|
|
// *
|
|
// * First table includes all errors generated by JPEG library itself.
|
|
// * Error code 0 is reserved for a "no such error string" message.
|
|
const char * const * jpeg_message_table; // Library errors
|
|
int last_jpeg_message; // Table contains strings 0..last_jpeg_message
|
|
// Second table can be added by application (see cjpeg/djpeg for example).
|
|
// * It contains strings numbered first_addon_message..last_addon_message.
|
|
const char * const * addon_message_table; // Non-library errors
|
|
int first_addon_message; // code for first string in addon table
|
|
int last_addon_message; // code for last string in addon table
|
|
};
|
|
|
|
|
|
// Progress monitor object
|
|
|
|
struct jpeg_progress_mgr {
|
|
JMETHOD(void, progress_monitor, (j_common_ptr cinfo));
|
|
|
|
LONG pass_counter; // work units completed in this pass
|
|
LONG pass_limit; // total number of work units in this pass
|
|
int completed_passes; // passes completed so far
|
|
int total_passes; // total number of passes expected
|
|
};
|
|
|
|
|
|
// Data destination object for compression
|
|
|
|
struct jpeg_destination_mgr {
|
|
JOCTET * next_output_byte; // => next byte to write in buffer
|
|
size_t free_in_buffer; // # of byte spaces remaining in buffer
|
|
|
|
JMETHOD(void, init_destination, (j_compress_ptr cinfo));
|
|
JMETHOD(boolean, empty_output_buffer, (j_compress_ptr cinfo));
|
|
JMETHOD(void, term_destination, (j_compress_ptr cinfo));
|
|
};
|
|
|
|
|
|
// Data source object for decompression
|
|
|
|
struct jpeg_source_mgr {
|
|
const JOCTET * next_input_byte; // => next byte to read from buffer
|
|
size_t bytes_in_buffer; // # of bytes remaining in buffer
|
|
|
|
JMETHOD(void, init_source, (j_decompress_ptr cinfo));
|
|
JMETHOD(boolean, fill_input_buffer, (j_decompress_ptr cinfo));
|
|
JMETHOD(void, skip_input_data, (j_decompress_ptr cinfo, LONG num_bytes));
|
|
JMETHOD(boolean, resync_to_restart, (j_decompress_ptr cinfo, int desired));
|
|
JMETHOD(void, term_source, (j_decompress_ptr cinfo));
|
|
};
|
|
|
|
|
|
// Memory manager object.
|
|
// * Allocates "small" objects (a few K total), "large" objects (tens of K),
|
|
// * and "really big" objects (virtual arrays with backing store if needed).
|
|
// * The memory manager does not allow individual objects to be freed; rather,
|
|
// * each created object is assigned to a pool, and whole pools can be freed
|
|
// * at once. This is faster and more convenient than remembering exactly what
|
|
// * to free, especially where malloc()/free() are not too speedy.
|
|
// * NB: alloc routines never return NULL. They exit to error_exit if not
|
|
// * successful.
|
|
|
|
#define JPOOL_PERMANENT 0 // lasts until master record is destroyed
|
|
#define JPOOL_IMAGE 1 // lasts until done with image/datastream
|
|
#define JPOOL_NUMPOOLS 2
|
|
|
|
typedef struct jvirt_sarray_control * jvirt_sarray_ptr;
|
|
typedef struct jvirt_barray_control * jvirt_barray_ptr;
|
|
|
|
|
|
struct jpeg_memory_mgr {
|
|
// Method pointers
|
|
JMETHOD(void *, alloc_small, (j_common_ptr cinfo, int pool_id,
|
|
size_t sizeofobject));
|
|
JMETHOD(void FAR *, alloc_large, (j_common_ptr cinfo, int pool_id,
|
|
size_t sizeofobject));
|
|
JMETHOD(JSAMPARRAY, alloc_sarray, (j_common_ptr cinfo, int pool_id,
|
|
JDIMENSION samplesperrow,
|
|
JDIMENSION numrows));
|
|
JMETHOD(JBLOCKARRAY, alloc_barray, (j_common_ptr cinfo, int pool_id,
|
|
JDIMENSION blocksperrow,
|
|
JDIMENSION numrows));
|
|
JMETHOD(jvirt_sarray_ptr, request_virt_sarray, (j_common_ptr cinfo,
|
|
int pool_id,
|
|
boolean pre_zero,
|
|
JDIMENSION samplesperrow,
|
|
JDIMENSION numrows,
|
|
JDIMENSION maxaccess));
|
|
JMETHOD(jvirt_barray_ptr, request_virt_barray, (j_common_ptr cinfo,
|
|
int pool_id,
|
|
boolean pre_zero,
|
|
JDIMENSION blocksperrow,
|
|
JDIMENSION numrows,
|
|
JDIMENSION maxaccess));
|
|
JMETHOD(void, realize_virt_arrays, (j_common_ptr cinfo));
|
|
JMETHOD(JSAMPARRAY, access_virt_sarray, (j_common_ptr cinfo,
|
|
jvirt_sarray_ptr ptr,
|
|
JDIMENSION start_row,
|
|
JDIMENSION num_rows,
|
|
boolean writable));
|
|
JMETHOD(JBLOCKARRAY, access_virt_barray, (j_common_ptr cinfo,
|
|
jvirt_barray_ptr ptr,
|
|
JDIMENSION start_row,
|
|
JDIMENSION num_rows,
|
|
boolean writable));
|
|
JMETHOD(void, free_pool, (j_common_ptr cinfo, int pool_id));
|
|
JMETHOD(void, self_destruct, (j_common_ptr cinfo));
|
|
|
|
// Limit on memory allocation for this JPEG object. (Note that this is
|
|
// * merely advisory, not a guaranteed maximum; it only affects the space
|
|
// * used for virtual-array buffers.) May be changed by outer application
|
|
// * after creating the JPEG object.
|
|
LONG max_memory_to_use;
|
|
};
|
|
|
|
|
|
// Routine signature for application-supplied marker processing methods.
|
|
// * Need not pass marker code since it is stored in cinfo->unread_marker.
|
|
typedef JMETHOD(boolean, jpeg_marker_parser_method, (j_decompress_ptr cinfo));
|
|
|
|
|
|
// Declarations for routines called by application.
|
|
// * The JPP macro hides prototype parameters from compilers that can't cope.
|
|
// * Note JPP requires double parentheses.
|
|
|
|
#ifdef HAVE_PROTOTYPES
|
|
#define JPP(arglist) arglist
|
|
#else
|
|
#define JPP(arglist) ()
|
|
#endif
|
|
|
|
|
|
// Short forms of external names for systems with brain-damaged linkers.
|
|
// * We shorten external names to be unique in the first six letters, which
|
|
// * is good enough for all known systems.
|
|
// * (If your compiler itself needs names to be unique in less than 15
|
|
// * characters, you are out of luck. Get a better compiler.)
|
|
|
|
#ifdef NEED_SHORT_EXTERNAL_NAMES
|
|
#define jpeg_std_error jStdError
|
|
#define jpeg_create_compress jCreaCompress
|
|
#define jpeg_create_decompress jCreaDecompress
|
|
#define jpeg_destroy_compress jDestCompress
|
|
#define jpeg_destroy_decompress jDestDecompress
|
|
#define jpeg_stdio_dest jStdDest
|
|
#define jpeg_stdio_src jStdSrc
|
|
#define jpeg_set_defaults jSetDefaults
|
|
#define jpeg_set_colorspace jSetColorspace
|
|
#define jpeg_default_colorspace jDefColorspace
|
|
#define jpeg_set_quality jSetQuality
|
|
#define jpeg_set_linear_quality jSetLQuality
|
|
#define jpeg_add_quant_table jAddQuantTable
|
|
#define jpeg_quality_scaling jQualityScaling
|
|
#define jpeg_simple_progression jSimProgress
|
|
#define jpeg_suppress_tables jSuppressTables
|
|
#define jpeg_alloc_quant_table jAlcQTable
|
|
#define jpeg_alloc_huff_table jAlcHTable
|
|
#define jpeg_start_compress jStrtCompress
|
|
#define jpeg_write_scanlines jWrtScanlines
|
|
#define jpeg_finish_compress jFinCompress
|
|
#define jpeg_write_raw_data jWrtRawData
|
|
#define jpeg_write_marker jWrtMarker
|
|
#define jpeg_write_tables jWrtTables
|
|
#define jpeg_read_header jReadHeader
|
|
#define jpeg_start_decompress jStrtDecompress
|
|
#define jpeg_read_scanlines jReadScanlines
|
|
#define jpeg_finish_decompress jFinDecompress
|
|
#define jpeg_read_raw_data jReadRawData
|
|
#define jpeg_has_multiple_scans jHasMultScn
|
|
#define jpeg_start_output jStrtOutput
|
|
#define jpeg_finish_output jFinOutput
|
|
#define jpeg_input_complete jInComplete
|
|
#define jpeg_new_colormap jNewCMap
|
|
#define jpeg_consume_input jConsumeInput
|
|
#define jpeg_calc_output_dimensions jCalcDimensions
|
|
#define jpeg_set_marker_processor jSetMarker
|
|
#define jpeg_read_coefficients jReadCoefs
|
|
#define jpeg_write_coefficients jWrtCoefs
|
|
#define jpeg_copy_critical_parameters jCopyCrit
|
|
#define jpeg_abort_compress jAbrtCompress
|
|
#define jpeg_abort_decompress jAbrtDecompress
|
|
#define jpeg_abort jAbort
|
|
#define jpeg_destroy jDestroy
|
|
#define jpeg_resync_to_restart jResyncRestart
|
|
#endif // NEED_SHORT_EXTERNAL_NAMES
|
|
|
|
|
|
// Default error-management setup
|
|
EXTERN struct jpeg_error_mgr *jpeg_std_error JPP((struct jpeg_error_mgr *err));
|
|
|
|
// Initialization and destruction of JPEG compression objects
|
|
// NB: you must set up the error-manager BEFORE calling jpeg_create_xxx
|
|
EXTERN void jpeg_create_compress JPP((j_compress_ptr cinfo));
|
|
EXTERN void jpeg_create_decompress JPP((j_decompress_ptr cinfo));
|
|
EXTERN void jpeg_destroy_compress JPP((j_compress_ptr cinfo));
|
|
EXTERN void jpeg_destroy_decompress JPP((j_decompress_ptr cinfo));
|
|
|
|
// Standard data source and destination managers: stdio streams.
|
|
// Caller is responsible for opening the file before and closing after.
|
|
EXTERN void jpeg_stdio_dest JPP((j_compress_ptr cinfo, FILE * outfile));
|
|
EXTERN void jpeg_stdio_src JPP((j_decompress_ptr cinfo));
|
|
|
|
// Default parameter setup for compression
|
|
EXTERN void jpeg_set_defaults JPP((j_compress_ptr cinfo));
|
|
// Compression parameter setup aids
|
|
EXTERN void jpeg_set_colorspace JPP((j_compress_ptr cinfo,
|
|
J_COLOR_SPACE colorspace));
|
|
EXTERN void jpeg_default_colorspace JPP((j_compress_ptr cinfo));
|
|
EXTERN void jpeg_set_quality JPP((j_compress_ptr cinfo, int quality,
|
|
boolean force_baseline));
|
|
EXTERN void jpeg_set_linear_quality JPP((j_compress_ptr cinfo,
|
|
int scale_factor,
|
|
boolean force_baseline));
|
|
EXTERN void jpeg_add_quant_table JPP((j_compress_ptr cinfo, int which_tbl,
|
|
const unsigned int *basic_table,
|
|
int scale_factor,
|
|
boolean force_baseline));
|
|
EXTERN int jpeg_quality_scaling JPP((int quality));
|
|
EXTERN void jpeg_simple_progression JPP((j_compress_ptr cinfo));
|
|
EXTERN void jpeg_suppress_tables JPP((j_compress_ptr cinfo,
|
|
boolean suppress));
|
|
EXTERN JQUANT_TBL * jpeg_alloc_quant_table JPP((j_common_ptr cinfo));
|
|
EXTERN JHUFF_TBL * jpeg_alloc_huff_table JPP((j_common_ptr cinfo));
|
|
|
|
// Main entry points for compression
|
|
EXTERN void jpeg_start_compress JPP((j_compress_ptr cinfo,
|
|
boolean write_all_tables));
|
|
EXTERN JDIMENSION jpeg_write_scanlines JPP((j_compress_ptr cinfo,
|
|
JSAMPARRAY scanlines,
|
|
JDIMENSION num_lines));
|
|
EXTERN void jpeg_finish_compress JPP((j_compress_ptr cinfo));
|
|
|
|
// Replaces jpeg_write_scanlines when writing raw downsampled data.
|
|
EXTERN JDIMENSION jpeg_write_raw_data JPP((j_compress_ptr cinfo,
|
|
JSAMPIMAGE data,
|
|
JDIMENSION num_lines));
|
|
|
|
// Write a special marker. See libjpeg.doc concerning safe usage.
|
|
EXTERN void jpeg_write_marker JPP((j_compress_ptr cinfo, int marker,
|
|
const JOCTET *dataptr, unsigned int datalen));
|
|
|
|
// Alternate compression function: just write an abbreviated table file
|
|
EXTERN void jpeg_write_tables JPP((j_compress_ptr cinfo));
|
|
|
|
// Decompression startup: read start of JPEG datastream to see what's there
|
|
EXTERN int jpeg_read_header JPP((j_decompress_ptr cinfo,
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boolean require_image));
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// Return value is one of:
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#define JPEG_SUSPENDED 0 // Suspended due to lack of input data
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#define JPEG_HEADER_OK 1 // Found valid image datastream
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#define JPEG_HEADER_TABLES_ONLY 2 // Found valid table-specs-only datastream
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// If you pass require_image = TRUE (normal case), you need not check for
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// * a TABLES_ONLY return code; an abbreviated file will cause an error exit.
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// * JPEG_SUSPENDED is only possible if you use a data source module that can
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// * give a suspension return (the stdio source module doesn't).
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// Main entry points for decompression
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EXTERN boolean jpeg_start_decompress JPP((j_decompress_ptr cinfo));
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EXTERN JDIMENSION jpeg_read_scanlines JPP((j_decompress_ptr cinfo,
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JSAMPARRAY scanlines,
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JDIMENSION max_lines));
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EXTERN boolean jpeg_finish_decompress JPP((j_decompress_ptr cinfo));
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// Replaces jpeg_read_scanlines when reading raw downsampled data.
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EXTERN JDIMENSION jpeg_read_raw_data JPP((j_decompress_ptr cinfo,
|
|
JSAMPIMAGE data,
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|
JDIMENSION max_lines));
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// Additional entry points for buffered-image mode.
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EXTERN boolean jpeg_has_multiple_scans JPP((j_decompress_ptr cinfo));
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EXTERN boolean jpeg_start_output JPP((j_decompress_ptr cinfo,
|
|
int scan_number));
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EXTERN boolean jpeg_finish_output JPP((j_decompress_ptr cinfo));
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EXTERN boolean jpeg_input_complete JPP((j_decompress_ptr cinfo));
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EXTERN void jpeg_new_colormap JPP((j_decompress_ptr cinfo));
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EXTERN int jpeg_consume_input JPP((j_decompress_ptr cinfo));
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// Return value is one of:
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|
// #define JPEG_SUSPENDED 0 Suspended due to lack of input data
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|
#define JPEG_REACHED_SOS 1 // Reached start of new scan
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#define JPEG_REACHED_EOI 2 // Reached end of image
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#define JPEG_ROW_COMPLETED 3 // Completed one iMCU row
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#define JPEG_SCAN_COMPLETED 4 // Completed last iMCU row of a scan
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|
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// Precalculate output dimensions for current decompression parameters.
|
|
EXTERN void jpeg_calc_output_dimensions JPP((j_decompress_ptr cinfo));
|
|
|
|
// Install a special processing method for COM or APPn markers.
|
|
EXTERN void jpeg_set_marker_processor JPP((j_decompress_ptr cinfo,
|
|
int marker_code,
|
|
jpeg_marker_parser_method routine));
|
|
|
|
// Read or write raw DCT coefficients --- useful for lossless transcoding.
|
|
EXTERN jvirt_barray_ptr * jpeg_read_coefficients JPP((j_decompress_ptr cinfo));
|
|
EXTERN void jpeg_write_coefficients JPP((j_compress_ptr cinfo,
|
|
jvirt_barray_ptr * coef_arrays));
|
|
EXTERN void jpeg_copy_critical_parameters JPP((j_decompress_ptr srcinfo,
|
|
j_compress_ptr dstinfo));
|
|
|
|
// If you choose to abort compression or decompression before completing
|
|
// * jpeg_finish_(de)compress, then you need to clean up to release memory,
|
|
// * temporary files, etc. You can just call jpeg_destroy_(de)compress
|
|
// * if you're done with the JPEG object, but if you want to clean it up and
|
|
// * reuse it, call this:
|
|
EXTERN void jpeg_abort_compress JPP((j_compress_ptr cinfo));
|
|
EXTERN void jpeg_abort_decompress JPP((j_decompress_ptr cinfo));
|
|
|
|
// Generic versions of jpeg_abort and jpeg_destroy that work on either
|
|
// * flavor of JPEG object. These may be more convenient in some places.
|
|
EXTERN void jpeg_abort JPP((j_common_ptr cinfo));
|
|
EXTERN void jpeg_destroy JPP((j_common_ptr cinfo));
|
|
|
|
// Default restart-marker-resync procedure for use by data source modules
|
|
EXTERN boolean jpeg_resync_to_restart JPP((j_decompress_ptr cinfo,
|
|
int desired));
|
|
|
|
|
|
// These marker codes are exported since applications and data source modules
|
|
// * are likely to want to use them.
|
|
|
|
#define JPEG_RST0 0xD0 // RST0 marker code
|
|
#define JPEG_EOI 0xD9 // EOI marker code
|
|
#define JPEG_APP0 0xE0 // APP0 marker code
|
|
#define JPEG_COM 0xFE // COM marker code
|
|
|
|
|
|
// If we have a brain-damaged compiler that emits warnings (or worse, errors)
|
|
// * for structure definitions that are never filled in, keep it quiet by
|
|
// * supplying dummy definitions for the various substructures.
|
|
|
|
#ifdef INCOMPLETE_TYPES_BROKEN
|
|
#ifndef JPEG_INTERNALS // will be defined in jpegint.h
|
|
struct jvirt_sarray_control { LONG dummy; };
|
|
struct jvirt_barray_control { LONG dummy; };
|
|
struct jpeg_comp_master { LONG dummy; };
|
|
struct jpeg_c_main_controller { LONG dummy; };
|
|
struct jpeg_c_prep_controller { LONG dummy; };
|
|
struct jpeg_c_coef_controller { LONG dummy; };
|
|
struct jpeg_marker_writer { LONG dummy; };
|
|
struct jpeg_color_converter { LONG dummy; };
|
|
struct jpeg_downsampler { LONG dummy; };
|
|
struct jpeg_forward_dct { LONG dummy; };
|
|
struct jpeg_entropy_encoder { LONG dummy; };
|
|
struct jpeg_decomp_master { LONG dummy; };
|
|
struct jpeg_d_main_controller { LONG dummy; };
|
|
struct jpeg_d_coef_controller { LONG dummy; };
|
|
struct jpeg_d_post_controller { LONG dummy; };
|
|
struct jpeg_input_controller { LONG dummy; };
|
|
struct jpeg_marker_reader { LONG dummy; };
|
|
struct jpeg_entropy_decoder { LONG dummy; };
|
|
struct jpeg_inverse_dct { LONG dummy; };
|
|
struct jpeg_upsampler { LONG dummy; };
|
|
struct jpeg_color_deconverter { LONG dummy; };
|
|
struct jpeg_color_quantizer { LONG dummy; };
|
|
#endif // JPEG_INTERNALS
|
|
#endif // INCOMPLETE_TYPES_BROKEN
|
|
|
|
|
|
// * The JPEG library modules define JPEG_INTERNALS before including this file.
|
|
// * The internal structure declarations are read only when that is true.
|
|
// * Applications using the library should not include jpegint.h, but may wish
|
|
// * to include jerror.h.
|
|
|
|
#ifdef JPEG_INTERNALS
|
|
#include "JPEGINT.h" // fetch private declarations
|
|
#include "JERROR.h" // fetch error codes too
|
|
#endif
|
|
|
|
#endif // JPEGLIB_H
|