Imported Upstream version 1.7.0upstream/1.7.0

1 files changed, 0 insertions, 213 deletions

diff --git a/jpg/transupp.h b/jpg/transupp.h
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-/*
- * transupp.h
- *
- * Copyright (C) 1997-2011, Thomas G. Lane, Guido Vollbeding.
- * 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.)
- * The adjustment of the region dimensions may be optionally disabled.
- *
- * We also provide a lossless-resize option, which is kind of a lossless-crop
- * operation in the DCT coefficient block domain - it discards higher-order
- * coefficients and losslessly preserves lower-order coefficients of a
- * sub-block.
- *
- * Rotate/flip transform, resize, and crop can be requested together in a
- * single invocation.  The crop is applied last --- that is, the crop region
- * is specified in terms of the destination image after transform/resize.
- *
- * 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 for xoffset or yoffset,
- * positive or forced for width or height.
- */
-
-typedef enum {
-        JCROP_UNSET,
-        JCROP_POS,
-        JCROP_NEG,
-        JCROP_FORCE
-} 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;	/* (forced disables adjustment) */
-  JDIMENSION crop_height;	/* Height of selected region */
-  JCROP_CODE crop_height_set;	/* (forced disables adjustment) */
-  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 iMCU_sample_width;	/* destination iMCU size */
-  int iMCU_sample_height;
-} 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(boolean) 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));