+++ /dev/null
-/*
- * transupp.h
- *
- * Copyright (C) 1997-2001, Thomas G. Lane.
- * This file is part of the Independent JPEG Group's software.
- * For conditions of distribution and use, see the accompanying README file.
- *
- * This file contains declarations for image transformation routines and
- * other utility code used by the jpegtran sample application. These are
- * NOT part of the core JPEG library. But we keep these routines separate
- * from jpegtran.c to ease the task of maintaining jpegtran-like programs
- * that have other user interfaces.
- *
- * NOTE: all the routines declared here have very specific requirements
- * about when they are to be executed during the reading and writing of the
- * source and destination files. See the comments in transupp.c, or see
- * jpegtran.c for an example of correct usage.
- */
-
-/* If you happen not to want the image transform support, disable it here */
-#ifndef TRANSFORMS_SUPPORTED
-#define TRANSFORMS_SUPPORTED 1 /* 0 disables transform code */
-#endif
-
-/*
- * Although rotating and flipping data expressed as DCT coefficients is not
- * hard, there is an asymmetry in the JPEG format specification for images
- * whose dimensions aren't multiples of the iMCU size. The right and bottom
- * image edges are padded out to the next iMCU boundary with junk data; but
- * no padding is possible at the top and left edges. If we were to flip
- * the whole image including the pad data, then pad garbage would become
- * visible at the top and/or left, and real pixels would disappear into the
- * pad margins --- perhaps permanently, since encoders & decoders may not
- * bother to preserve DCT blocks that appear to be completely outside the
- * nominal image area. So, we have to exclude any partial iMCUs from the
- * basic transformation.
- *
- * Transpose is the only transformation that can handle partial iMCUs at the
- * right and bottom edges completely cleanly. flip_h can flip partial iMCUs
- * at the bottom, but leaves any partial iMCUs at the right edge untouched.
- * Similarly flip_v leaves any partial iMCUs at the bottom edge untouched.
- * The other transforms are defined as combinations of these basic transforms
- * and process edge blocks in a way that preserves the equivalence.
- *
- * The "trim" option causes untransformable partial iMCUs to be dropped;
- * this is not strictly lossless, but it usually gives the best-looking
- * result for odd-size images. Note that when this option is active,
- * the expected mathematical equivalences between the transforms may not hold.
- * (For example, -rot 270 -trim trims only the bottom edge, but -rot 90 -trim
- * followed by -rot 180 -trim trims both edges.)
- *
- * We also offer a lossless-crop option, which discards data outside a given
- * image region but losslessly preserves what is inside. Like the rotate and
- * flip transforms, lossless crop is restricted by the JPEG format: the upper
- * left corner of the selected region must fall on an iMCU boundary. If this
- * does not hold for the given crop parameters, we silently move the upper left
- * corner up and/or left to make it so, simultaneously increasing the region
- * dimensions to keep the lower right crop corner unchanged. (Thus, the
- * output image covers at least the requested region, but may cover more.)
- *
- * If both crop and a rotate/flip transform are requested, the crop is applied
- * last --- that is, the crop region is specified in terms of the destination
- * image.
- *
- * We also offer a "force to grayscale" option, which simply discards the
- * chrominance channels of a YCbCr image. This is lossless in the sense that
- * the luminance channel is preserved exactly. It's not the same kind of
- * thing as the rotate/flip transformations, but it's convenient to handle it
- * as part of this package, mainly because the transformation routines have to
- * be aware of the option to know how many components to work on.
- */
-
-
-/* Short forms of external names for systems with brain-damaged linkers. */
-
-#ifdef NEED_SHORT_EXTERNAL_NAMES
-#define jtransform_parse_crop_spec jTrParCrop
-#define jtransform_request_workspace jTrRequest
-#define jtransform_adjust_parameters jTrAdjust
-#define jtransform_execute_transform jTrExec
-#define jtransform_perfect_transform jTrPerfect
-#define jcopy_markers_setup jCMrkSetup
-#define jcopy_markers_execute jCMrkExec
-#endif /* NEED_SHORT_EXTERNAL_NAMES */
-
-
-/*
- * Codes for supported types of image transformations.
- */
-
-typedef enum {
- JXFORM_NONE, /* no transformation */
- JXFORM_FLIP_H, /* horizontal flip */
- JXFORM_FLIP_V, /* vertical flip */
- JXFORM_TRANSPOSE, /* transpose across UL-to-LR axis */
- JXFORM_TRANSVERSE, /* transpose across UR-to-LL axis */
- JXFORM_ROT_90, /* 90-degree clockwise rotation */
- JXFORM_ROT_180, /* 180-degree rotation */
- JXFORM_ROT_270 /* 270-degree clockwise (or 90 ccw) */
-} JXFORM_CODE;
-
-/*
- * Codes for crop parameters, which can individually be unspecified,
- * positive, or negative. (Negative width or height makes no sense, though.)
- */
-
-typedef enum {
- JCROP_UNSET,
- JCROP_POS,
- JCROP_NEG
-} JCROP_CODE;
-
-/*
- * Transform parameters struct.
- * NB: application must not change any elements of this struct after
- * calling jtransform_request_workspace.
- */
-
-typedef struct {
- /* Options: set by caller */
- JXFORM_CODE transform; /* image transform operator */
- boolean perfect; /* if TRUE, fail if partial MCUs are requested */
- boolean trim; /* if TRUE, trim partial MCUs as needed */
- boolean force_grayscale; /* if TRUE, convert color image to grayscale */
- boolean crop; /* if TRUE, crop source image */
-
- /* Crop parameters: application need not set these unless crop is TRUE.
- * These can be filled in by jtransform_parse_crop_spec().
- */
- JDIMENSION crop_width; /* Width of selected region */
- JCROP_CODE crop_width_set;
- JDIMENSION crop_height; /* Height of selected region */
- JCROP_CODE crop_height_set;
- JDIMENSION crop_xoffset; /* X offset of selected region */
- JCROP_CODE crop_xoffset_set; /* (negative measures from right edge) */
- JDIMENSION crop_yoffset; /* Y offset of selected region */
- JCROP_CODE crop_yoffset_set; /* (negative measures from bottom edge) */
-
- /* Internal workspace: caller should not touch these */
- int num_components; /* # of components in workspace */
- jvirt_barray_ptr * workspace_coef_arrays; /* workspace for transformations */
- JDIMENSION output_width; /* cropped destination dimensions */
- JDIMENSION output_height;
- JDIMENSION x_crop_offset; /* destination crop offsets measured in iMCUs */
- JDIMENSION y_crop_offset;
- int max_h_samp_factor; /* destination iMCU size */
- int max_v_samp_factor;
-} jpeg_transform_info;
-
-
-#if TRANSFORMS_SUPPORTED
-
-/* Parse a crop specification (written in X11 geometry style) */
-EXTERN(boolean) jtransform_parse_crop_spec
- JPP((jpeg_transform_info *info, const char *spec));
-/* Request any required workspace */
-EXTERN(void) jtransform_request_workspace
- JPP((j_decompress_ptr srcinfo, jpeg_transform_info *info));
-/* Adjust output image parameters */
-EXTERN(jvirt_barray_ptr *) jtransform_adjust_parameters
- JPP((j_decompress_ptr srcinfo, j_compress_ptr dstinfo,
- jvirt_barray_ptr *src_coef_arrays,
- jpeg_transform_info *info));
-/* Execute the actual transformation, if any */
-EXTERN(void) jtransform_execute_transform
- JPP((j_decompress_ptr srcinfo, j_compress_ptr dstinfo,
- jvirt_barray_ptr *src_coef_arrays,
- jpeg_transform_info *info));
-/* Determine whether lossless transformation is perfectly
- * possible for a specified image and transformation.
- */
-EXTERN(boolean) jtransform_perfect_transform
- JPP((JDIMENSION image_width, JDIMENSION image_height,
- int MCU_width, int MCU_height,
- JXFORM_CODE transform));
-
-/* jtransform_execute_transform used to be called
- * jtransform_execute_transformation, but some compilers complain about
- * routine names that long. This macro is here to avoid breaking any
- * old source code that uses the original name...
- */
-#define jtransform_execute_transformation jtransform_execute_transform
-
-#endif /* TRANSFORMS_SUPPORTED */
-
-
-/*
- * Support for copying optional markers from source to destination file.
- */
-
-typedef enum {
- JCOPYOPT_NONE, /* copy no optional markers */
- JCOPYOPT_COMMENTS, /* copy only comment (COM) markers */
- JCOPYOPT_ALL /* copy all optional markers */
-} JCOPY_OPTION;
-
-#define JCOPYOPT_DEFAULT JCOPYOPT_COMMENTS /* recommended default */
-
-/* Setup decompression object to save desired markers in memory */
-EXTERN(void) jcopy_markers_setup
- JPP((j_decompress_ptr srcinfo, JCOPY_OPTION option));
-/* Copy markers saved in the given source object to the destination object */
-EXTERN(void) jcopy_markers_execute
- JPP((j_decompress_ptr srcinfo, j_compress_ptr dstinfo,
- JCOPY_OPTION option));
projects / opencv / blobdiff