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+/*
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+ * jpeglib.h
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+ *
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+ * Copyright (C) 1991-1998, Thomas G. Lane.
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+ * Modified 2002-2015 by Guido Vollbeding.
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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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+ */
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+
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+#ifndef JPEGLIB_H
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+#define JPEGLIB_H
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+
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+/*
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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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+ */
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+
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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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+
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+
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+#ifdef __cplusplus
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+#ifndef DONT_USE_EXTERN_C
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+extern "C" {
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+#endif
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+#endif
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+
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+/* Version IDs for the JPEG library.
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+ * Might be useful for tests like "#if JPEG_LIB_VERSION >= 90".
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+ */
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+
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+#define JPEG_LIB_VERSION 90 /* Compatibility version 9.0 */
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+#define JPEG_LIB_VERSION_MAJOR 9
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+#define JPEG_LIB_VERSION_MINOR 2
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+
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+
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+/* Various constants determining the sizes of things.
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+ * All of these are specified by the JPEG standard,
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+ * so don't change them if you want to be compatible.
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+ */
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+
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+#define DCTSIZE 8 /* The basic DCT block is 8x8 coefficients */
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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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+ */
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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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+
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+
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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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+ */
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+
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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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+
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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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+
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+typedef JCOEF FAR *JCOEFPTR; /* useful in a couple of places */
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+
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+
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+/* Types for JPEG compression parameters and working tables. */
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+
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+
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+/* DCT coefficient quantization tables. */
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+
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+typedef struct {
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+ /* This array gives the coefficient quantizers in natural array order
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+ * (not the zigzag order in which they are stored in a JPEG DQT marker).
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+ * CAUTION: IJG versions prior to v6a kept this array in zigzag order.
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+ */
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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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+ */
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+ boolean sent_table; /* TRUE when table has been output */
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+} JQUANT_TBL;
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+
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+
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+/* Huffman coding tables. */
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+
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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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+ */
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+ boolean sent_table; /* TRUE when table has been output */
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+} JHUFF_TBL;
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+
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+
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+/* Basic info about one component (color channel). */
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+
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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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+
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+ /* Remaining fields should be treated as private by applications. */
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+
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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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+ */
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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,
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+ * reflecting any scaling we choose to apply during the DCT step.
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+ * Values from 1 to 16 are supported.
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+ * Note that different components may receive different DCT scalings.
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+ */
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+ int DCT_h_scaled_size;
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+ int DCT_v_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);
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+ * DCT scaling is included, so
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+ * downsampled_width =
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+ * ceil(image_width * Hi/Hmax * DCT_h_scaled_size/block_size)
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+ * and similarly for height.
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+ */
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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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+ /* For decompression, in cases where some of the components will be
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+ * ignored (eg grayscale output from YCbCr image), we can skip most
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+ * computations for the unused components.
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+ * For compression, some of the components will need further quantization
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+ * scale by factor of 2 after DCT (eg BG_YCC output from normal RGB input).
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+ * The field is first set TRUE for decompression, FALSE for compression
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+ * in initial_setup, and then adapted in color conversion setup.
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+ */
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+ boolean component_needed;
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+
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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_h_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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+
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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 currently used only for decompression.
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+ */
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+ JQUANT_TBL * quant_table;
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+
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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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+
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+
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+/* The script for encoding a multiple-scan file is an array of these: */
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+
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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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+
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+/* The decompressor can save APPn and COM markers in a list of these: */
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+
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+typedef struct jpeg_marker_struct FAR * jpeg_saved_marker_ptr;
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+
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+struct jpeg_marker_struct {
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+ jpeg_saved_marker_ptr next; /* next in list, or NULL */
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+ UINT8 marker; /* marker code: JPEG_COM, or JPEG_APP0+n */
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+ unsigned int original_length; /* # bytes of data in the file */
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+ unsigned int data_length; /* # bytes of data saved at data[] */
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+ JOCTET FAR * data; /* the data contained in the marker */
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+ /* the marker length word is not counted in data_length or original_length */
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+};
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+
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+/* Known color spaces. */
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+
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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, standard RGB (sRGB) */
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+ JCS_YCbCr, /* Y/Cb/Cr (also known as YUV), standard YCC */
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+ JCS_CMYK, /* C/M/Y/K */
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+ JCS_YCCK, /* Y/Cb/Cr/K */
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+ JCS_BG_RGB, /* big gamut red/green/blue, bg-sRGB */
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+ JCS_BG_YCC /* big gamut Y/Cb/Cr, bg-sYCC */
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+} J_COLOR_SPACE;
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+
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+/* Supported color transforms. */
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+
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+typedef enum {
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+ JCT_NONE = 0,
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+ JCT_SUBTRACT_GREEN = 1
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+} J_COLOR_TRANSFORM;
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+
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+/* DCT/IDCT algorithm options. */
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+
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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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+
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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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+
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+/* Dithering options for decompression. */
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+
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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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+
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+
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+/* Common fields between JPEG compression and decompression master structs. */
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+
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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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+ void * client_data; /* Available for use by application */\
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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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+
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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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+ */
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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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+};
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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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+
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+
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+/* Master record for a compression instance */
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+
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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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+
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+ /* Destination for compressed data */
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+ struct jpeg_destination_mgr * dest;
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+
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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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+ */
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+
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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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+
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+ double input_gamma; /* image gamma of input image */
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+
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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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+ */
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+
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+ unsigned int scale_num, scale_denom; /* fraction by which to scale image */
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+
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+ JDIMENSION jpeg_width; /* scaled JPEG image width */
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+ JDIMENSION jpeg_height; /* scaled JPEG image height */
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+ /* Dimensions of actual JPEG image that will be written to file,
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+ * derived from input dimensions by scaling factors above.
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+ * These fields are computed by jpeg_start_compress().
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+ * You can also use jpeg_calc_jpeg_dimensions() to determine these values
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+ * in advance of calling jpeg_start_compress().
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+ */
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+
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+ int data_precision; /* bits of precision in image data */
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+
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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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+
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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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+
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+ JQUANT_TBL * quant_tbl_ptrs[NUM_QUANT_TBLS];
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+ int q_scale_factor[NUM_QUANT_TBLS];
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+ /* ptrs to coefficient quantization tables, or NULL if not defined,
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+ * and corresponding scale factors (percentage, initialized 100).
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+ */
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+
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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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+
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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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+
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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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+ */
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+
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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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+ boolean do_fancy_downsampling; /* TRUE=apply fancy downsampling */
|
|
|
+ int smoothing_factor; /* 1..100, or 0 for no input smoothing */
|
|
|
+ J_DCT_METHOD dct_method; /* DCT algorithm selector */
|
|
|
+
|
|
|
+ /* The restart interval can be specified in absolute MCUs by setting
|
|
|
+ * restart_interval, or in MCU rows by setting restart_in_rows
|
|
|
+ * (in which case the correct restart_interval will be figured
|
|
|
+ * for each scan).
|
|
|
+ */
|
|
|
+ unsigned int restart_interval; /* MCUs per restart, or 0 for no restart */
|
|
|
+ int restart_in_rows; /* if > 0, MCU rows per restart interval */
|
|
|
+
|
|
|
+ /* Parameters controlling emission of special markers. */
|
|
|
+
|
|
|
+ boolean write_JFIF_header; /* should a JFIF marker be written? */
|
|
|
+ UINT8 JFIF_major_version; /* What to write for the JFIF version number */
|
|
|
+ UINT8 JFIF_minor_version;
|
|
|
+ /* These three values are not used by the JPEG code, merely copied */
|
|
|
+ /* into the JFIF APP0 marker. density_unit can be 0 for unknown, */
|
|
|
+ /* 1 for dots/inch, or 2 for dots/cm. Note that the pixel aspect */
|
|
|
+ /* ratio is defined by X_density/Y_density even when density_unit=0. */
|
|
|
+ UINT8 density_unit; /* JFIF code for pixel size units */
|
|
|
+ UINT16 X_density; /* Horizontal pixel density */
|
|
|
+ UINT16 Y_density; /* Vertical pixel density */
|
|
|
+ boolean write_Adobe_marker; /* should an Adobe marker be written? */
|
|
|
+
|
|
|
+ J_COLOR_TRANSFORM color_transform;
|
|
|
+ /* Color transform identifier, writes LSE marker if nonzero */
|
|
|
+
|
|
|
+ /* State variable: index of next scanline to be written to
|
|
|
+ * jpeg_write_scanlines(). Application may use this to control its
|
|
|
+ * processing loop, e.g., "while (next_scanline < image_height)".
|
|
|
+ */
|
|
|
+
|
|
|
+ JDIMENSION next_scanline; /* 0 .. image_height-1 */
|
|
|
+
|
|
|
+ /* Remaining fields are known throughout compressor, but generally
|
|
|
+ * should not be touched by a surrounding application.
|
|
|
+ */
|
|
|
+
|
|
|
+ /*
|
|
|
+ * These fields are computed during compression startup
|
|
|
+ */
|
|
|
+ boolean progressive_mode; /* TRUE if scan script uses progressive mode */
|
|
|
+ int max_h_samp_factor; /* largest h_samp_factor */
|
|
|
+ int max_v_samp_factor; /* largest v_samp_factor */
|
|
|
+
|
|
|
+ int min_DCT_h_scaled_size; /* smallest DCT_h_scaled_size of any component */
|
|
|
+ int min_DCT_v_scaled_size; /* smallest DCT_v_scaled_size of any component */
|
|
|
+
|
|
|
+ JDIMENSION total_iMCU_rows; /* # of iMCU rows to be input to coef ctlr */
|
|
|
+ /* The coefficient controller receives data in units of MCU rows as defined
|
|
|
+ * for fully interleaved scans (whether the JPEG file is interleaved or not).
|
|
|
+ * There are v_samp_factor * DCTSIZE sample rows of each component in an
|
|
|
+ * "iMCU" (interleaved MCU) row.
|
|
|
+ */
|
|
|
+
|
|
|
+ /*
|
|
|
+ * These fields are valid during any one scan.
|
|
|
+ * They describe the components and MCUs actually appearing in the scan.
|
|
|
+ */
|
|
|
+ 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[C_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 */
|
|
|
+
|
|
|
+ int block_size; /* the basic DCT block size: 1..16 */
|
|
|
+ const int * natural_order; /* natural-order position array */
|
|
|
+ int lim_Se; /* min( Se, DCTSIZE2-1 ) */
|
|
|
+
|
|
|
+ /*
|
|
|
+ * Links to compression subobjects (methods and private variables of modules)
|
|
|
+ */
|
|
|
+ struct jpeg_comp_master * master;
|
|
|
+ struct jpeg_c_main_controller * main;
|
|
|
+ struct jpeg_c_prep_controller * prep;
|
|
|
+ struct jpeg_c_coef_controller * coef;
|
|
|
+ struct jpeg_marker_writer * marker;
|
|
|
+ struct jpeg_color_converter * cconvert;
|
|
|
+ struct jpeg_downsampler * downsample;
|
|
|
+ struct jpeg_forward_dct * fdct;
|
|
|
+ struct jpeg_entropy_encoder * entropy;
|
|
|
+ jpeg_scan_info * script_space; /* workspace for jpeg_simple_progression */
|
|
|
+ int script_space_size;
|
|
|
+};
|
|
|
+
|
|
|
+
|
|
|
+/* Master record for a decompression instance */
|
|
|
+
|
|
|
+struct jpeg_decompress_struct {
|
|
|
+ jpeg_common_fields; /* Fields shared with jpeg_compress_struct */
|
|
|
+
|
|
|
+ /* Source of compressed data */
|
|
|
+ struct jpeg_source_mgr * src;
|
|
|
+
|
|
|
+ /* Basic description of image --- filled in by jpeg_read_header(). */
|
|
|
+ /* Application may inspect these values to decide how to process image. */
|
|
|
+
|
|
|
+ JDIMENSION image_width; /* nominal image width (from SOF marker) */
|
|
|
+ JDIMENSION image_height; /* nominal image height */
|
|
|
+ int num_components; /* # of color components in JPEG image */
|
|
|
+ J_COLOR_SPACE jpeg_color_space; /* colorspace of JPEG image */
|
|
|
+
|
|
|
+ /* Decompression processing parameters --- these fields must be set before
|
|
|
+ * calling jpeg_start_decompress(). Note that jpeg_read_header() initializes
|
|
|
+ * them to default values.
|
|
|
+ */
|
|
|
+
|
|
|
+ J_COLOR_SPACE out_color_space; /* colorspace for output */
|
|
|
+
|
|
|
+ unsigned int scale_num, scale_denom; /* fraction by which to scale image */
|
|
|
+
|
|
|
+ double output_gamma; /* image gamma wanted in output */
|
|
|
+
|
|
|
+ boolean buffered_image; /* TRUE=multiple output passes */
|
|
|
+ boolean raw_data_out; /* TRUE=downsampled data wanted */
|
|
|
+
|
|
|
+ J_DCT_METHOD dct_method; /* IDCT algorithm selector */
|
|
|
+ boolean do_fancy_upsampling; /* TRUE=apply fancy upsampling */
|
|
|
+ boolean do_block_smoothing; /* TRUE=apply interblock smoothing */
|
|
|
+
|
|
|
+ boolean quantize_colors; /* TRUE=colormapped output wanted */
|
|
|
+ /* the following are ignored if not quantize_colors: */
|
|
|
+ J_DITHER_MODE dither_mode; /* type of color dithering to use */
|
|
|
+ boolean two_pass_quantize; /* TRUE=use two-pass color quantization */
|
|
|
+ int desired_number_of_colors; /* max # colors to use in created colormap */
|
|
|
+ /* these are significant only in buffered-image mode: */
|
|
|
+ boolean enable_1pass_quant; /* enable future use of 1-pass quantizer */
|
|
|
+ boolean enable_external_quant;/* enable future use of external colormap */
|
|
|
+ boolean enable_2pass_quant; /* enable future use of 2-pass quantizer */
|
|
|
+
|
|
|
+ /* Description of actual output image that will be returned to application.
|
|
|
+ * These fields are computed by jpeg_start_decompress().
|
|
|
+ * You can also use jpeg_calc_output_dimensions() to determine these values
|
|
|
+ * in advance of calling jpeg_start_decompress().
|
|
|
+ */
|
|
|
+
|
|
|
+ JDIMENSION output_width; /* scaled image width */
|
|
|
+ JDIMENSION output_height; /* scaled image height */
|
|
|
+ int out_color_components; /* # of color components in out_color_space */
|
|
|
+ int output_components; /* # of color components returned */
|
|
|
+ /* output_components is 1 (a colormap index) when quantizing colors;
|
|
|
+ * otherwise it equals out_color_components.
|
|
|
+ */
|
|
|
+ int rec_outbuf_height; /* min recommended height of scanline buffer */
|
|
|
+ /* If the buffer passed to jpeg_read_scanlines() is less than this many rows
|
|
|
+ * high, space and time will be wasted due to unnecessary data copying.
|
|
|
+ * Usually rec_outbuf_height will be 1 or 2, at most 4.
|
|
|
+ */
|
|
|
+
|
|
|
+ /* When quantizing colors, the output colormap is described by these fields.
|
|
|
+ * The application can supply a colormap by setting colormap non-NULL before
|
|
|
+ * 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 is_baseline; /* TRUE if Baseline SOF0 encountered */
|
|
|
+ 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; only valid if saw_JFIF_marker is TRUE: */
|
|
|
+ UINT8 JFIF_major_version; /* JFIF version number */
|
|
|
+ UINT8 JFIF_minor_version;
|
|
|
+ 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 */
|
|
|
+
|
|
|
+ J_COLOR_TRANSFORM color_transform;
|
|
|
+ /* Color transform identifier derived from LSE marker, otherwise zero */
|
|
|
+
|
|
|
+ boolean CCIR601_sampling; /* TRUE=first samples are cosited */
|
|
|
+
|
|
|
+ /* Aside from the specific data retained from APPn markers known to the
|
|
|
+ * library, the uninterpreted contents of any or all APPn and COM markers
|
|
|
+ * can be saved in a list for examination by the application.
|
|
|
+ */
|
|
|
+ jpeg_saved_marker_ptr marker_list; /* Head of list of saved markers */
|
|
|
+
|
|
|
+ /* 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_h_scaled_size; /* smallest DCT_h_scaled_size of any component */
|
|
|
+ int min_DCT_v_scaled_size; /* smallest DCT_v_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_v_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 */
|
|
|
+
|
|
|
+ /* These fields are derived from Se of first SOS marker.
|
|
|
+ */
|
|
|
+ int block_size; /* the basic DCT block size: 1..16 */
|
|
|
+ const int * natural_order; /* natural-order position array for entropy decode */
|
|
|
+ int lim_Se; /* min( Se, DCTSIZE2-1 ) for entropy decode */
|
|
|
+
|
|
|
+ /* 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(noreturn_t, 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;
|
|
|
+
|
|
|
+ /* Maximum allocation request accepted by alloc_large. */
|
|
|
+ long max_alloc_chunk;
|
|
|
+};
|
|
|
+
|
|
|
+
|
|
|
+/* 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_CreateCompress jCreaCompress
|
|
|
+#define jpeg_CreateDecompress jCreaDecompress
|
|
|
+#define jpeg_destroy_compress jDestCompress
|
|
|
+#define jpeg_destroy_decompress jDestDecompress
|
|
|
+#define jpeg_stdio_dest jStdDest
|
|
|
+#define jpeg_stdio_src jStdSrc
|
|
|
+#define jpeg_mem_dest jMemDest
|
|
|
+#define jpeg_mem_src jMemSrc
|
|
|
+#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_default_qtables jDefQTables
|
|
|
+#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_calc_jpeg_dimensions jCjpegDimensions
|
|
|
+#define jpeg_write_raw_data jWrtRawData
|
|
|
+#define jpeg_write_marker jWrtMarker
|
|
|
+#define jpeg_write_m_header jWrtMHeader
|
|
|
+#define jpeg_write_m_byte jWrtMByte
|
|
|
+#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_core_output_dimensions jCoreDimensions
|
|
|
+#define jpeg_calc_output_dimensions jCalcDimensions
|
|
|
+#define jpeg_save_markers jSaveMarkers
|
|
|
+#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 of JPEG compression objects.
|
|
|
+ * jpeg_create_compress() and jpeg_create_decompress() are the exported
|
|
|
+ * names that applications should call. These expand to calls on
|
|
|
+ * jpeg_CreateCompress and jpeg_CreateDecompress with additional information
|
|
|
+ * passed for version mismatch checking.
|
|
|
+ * NB: you must set up the error-manager BEFORE calling jpeg_create_xxx.
|
|
|
+ */
|
|
|
+#define jpeg_create_compress(cinfo) \
|
|
|
+ jpeg_CreateCompress((cinfo), JPEG_LIB_VERSION, \
|
|
|
+ (size_t) sizeof(struct jpeg_compress_struct))
|
|
|
+#define jpeg_create_decompress(cinfo) \
|
|
|
+ jpeg_CreateDecompress((cinfo), JPEG_LIB_VERSION, \
|
|
|
+ (size_t) sizeof(struct jpeg_decompress_struct))
|
|
|
+EXTERN(void) jpeg_CreateCompress JPP((j_compress_ptr cinfo,
|
|
|
+ int version, size_t structsize));
|
|
|
+EXTERN(void) jpeg_CreateDecompress JPP((j_decompress_ptr cinfo,
|
|
|
+ int version, size_t structsize));
|
|
|
+/* Destruction of JPEG compression objects */
|
|
|
+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, FILE * infile));
|
|
|
+
|
|
|
+/* Data source and destination managers: memory buffers. */
|
|
|
+EXTERN(void) jpeg_mem_dest JPP((j_compress_ptr cinfo,
|
|
|
+ unsigned char ** outbuffer,
|
|
|
+ unsigned long * outsize));
|
|
|
+EXTERN(void) jpeg_mem_src JPP((j_decompress_ptr cinfo,
|
|
|
+ const unsigned char * inbuffer,
|
|
|
+ unsigned long insize));
|
|
|
+
|
|
|
+/* 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_default_qtables JPP((j_compress_ptr cinfo,
|
|
|
+ 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));
|
|
|
+
|
|
|
+/* Precalculate JPEG dimensions for current compression parameters. */
|
|
|
+EXTERN(void) jpeg_calc_jpeg_dimensions 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.txt concerning safe usage. */
|
|
|
+EXTERN(void) jpeg_write_marker
|
|
|
+ JPP((j_compress_ptr cinfo, int marker,
|
|
|
+ const JOCTET * dataptr, unsigned int datalen));
|
|
|
+/* Same, but piecemeal. */
|
|
|
+EXTERN(void) jpeg_write_m_header
|
|
|
+ JPP((j_compress_ptr cinfo, int marker, unsigned int datalen));
|
|
|
+EXTERN(void) jpeg_write_m_byte
|
|
|
+ JPP((j_compress_ptr cinfo, int val));
|
|
|
+
|
|
|
+/* 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,
|
|
|
+ boolean require_image));
|
|
|
+/* Return value is one of: */
|
|
|
+#define JPEG_SUSPENDED 0 /* Suspended due to lack of input data */
|
|
|
+#define JPEG_HEADER_OK 1 /* Found valid image datastream */
|
|
|
+#define JPEG_HEADER_TABLES_ONLY 2 /* Found valid table-specs-only datastream */
|
|
|
+/* If you pass require_image = TRUE (normal case), you need not check for
|
|
|
+ * a TABLES_ONLY return code; an abbreviated file will cause an error exit.
|
|
|
+ * JPEG_SUSPENDED is only possible if you use a data source module that can
|
|
|
+ * give a suspension return (the stdio source module doesn't).
|
|
|
+ */
|
|
|
+
|
|
|
+/* Main entry points for decompression */
|
|
|
+EXTERN(boolean) jpeg_start_decompress JPP((j_decompress_ptr cinfo));
|
|
|
+EXTERN(JDIMENSION) jpeg_read_scanlines JPP((j_decompress_ptr cinfo,
|
|
|
+ JSAMPARRAY scanlines,
|
|
|
+ JDIMENSION max_lines));
|
|
|
+EXTERN(boolean) jpeg_finish_decompress JPP((j_decompress_ptr cinfo));
|
|
|
+
|
|
|
+/* Replaces jpeg_read_scanlines when reading raw downsampled data. */
|
|
|
+EXTERN(JDIMENSION) jpeg_read_raw_data JPP((j_decompress_ptr cinfo,
|
|
|
+ JSAMPIMAGE data,
|
|
|
+ JDIMENSION max_lines));
|
|
|
+
|
|
|
+/* 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,
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|
+ 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: */
|
|
|
+/* #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. */
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+EXTERN(void) jpeg_core_output_dimensions JPP((j_decompress_ptr cinfo));
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+EXTERN(void) jpeg_calc_output_dimensions JPP((j_decompress_ptr cinfo));
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+
|
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+/* Control saving of COM and APPn markers into marker_list. */
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+EXTERN(void) jpeg_save_markers
|
|
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+ JPP((j_decompress_ptr cinfo, int marker_code,
|
|
|
+ unsigned int length_limit));
|
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+
|
|
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+/* Install a special processing method for COM or APPn markers. */
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|
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+EXTERN(void) jpeg_set_marker_processor
|
|
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+ JPP((j_decompress_ptr cinfo, int marker_code,
|
|
|
+ jpeg_marker_parser_method routine));
|
|
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+
|
|
|
+/* Read or write raw DCT coefficients --- useful for lossless transcoding. */
|
|
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+EXTERN(jvirt_barray_ptr *) jpeg_read_coefficients JPP((j_decompress_ptr cinfo));
|
|
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+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
|
|
|
+
|
|
|
+#ifdef __cplusplus
|
|
|
+#ifndef DONT_USE_EXTERN_C
|
|
|
+}
|
|
|
+#endif
|
|
|
+#endif
|
|
|
+
|
|
|
+#endif /* JPEGLIB_H */
|
陈纪林80310970