214 lines
9.1 KiB
C
214 lines
9.1 KiB
C
/*
|
|
* 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));
|