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+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
+
+/*
+ * GThumb
+ *
+ * Copyright (C) 2001, 2002 The Free Software Foundation, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Street #330, Boston, MA 02111-1307, USA.
+ */
+
+/* based upon file transupp.h from the libjpeg package, original copyright
+ * note follows:
+ *
+ * transupp.h
+ *
+ * Copyright (C) 1997, 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.
+ */
+
+/*
+ * Codes for supported types of image transformations.
+ */
+
+#ifdef HAVE_LIBJPEG
+
+
+#ifndef TRANSUPP_H
+#define TRANSUPP_H
+
+#include <jpeglib.h>
+
+
+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;
+
+/*
+ * 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 "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.
+ */
+
+typedef struct {
+ /* Options: set by caller */
+ JXFORM_CODE transform; /* image transform operator */
+ boolean trim; /* if TRUE, trim partial MCUs as needed */
+ boolean force_grayscale; /* if TRUE, convert color image to grayscale */
+
+ /* Internal workspace: caller should not touch these */
+ int num_components; /* # of components in workspace */
+ jvirt_barray_ptr * workspace_coef_arrays; /* workspace for transformations */
+} jpeg_transform_info;
+
+
+/* Request any required workspace */
+void jtransform_request_workspace (j_decompress_ptr srcinfo,
+ jpeg_transform_info *info);
+
+/* Adjust output image parameters */
+
+jvirt_barray_ptr * jtransform_adjust_parameters (j_decompress_ptr srcinfo,
+ j_compress_ptr dstinfo,
+ jvirt_barray_ptr *src_coef_arrays,
+ jpeg_transform_info *info);
+
+/* Execute the actual transformation, if any */
+void jtransform_execute_transformation (j_decompress_ptr srcinfo,
+ j_compress_ptr dstinfo,
+ jvirt_barray_ptr *src_coef_arrays,
+ jpeg_transform_info *info);
+
+
+/*
+ * 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 */
+void jcopy_markers_setup (j_decompress_ptr srcinfo,
+ JCOPY_OPTION option);
+
+/* Copy markers saved in the given source object to the destination object */
+void jcopy_markers_execute (j_decompress_ptr srcinfo,
+ j_compress_ptr dstinfo,
+ JCOPY_OPTION option);
+
+
+#endif /* TRANSUPP_H */
+
+#endif /* HAVE_LIBJPEG */