libjpeg versioning

1 files changed, 0 insertions, 928 deletions

diff --git a/jpeg/transupp.c b/jpeg/transupp.c
deleted file mode 100644
index e5ec564..0000000
--- a/jpeg/transupp.c
+++ /dev/null
@@ -1,928 +0,0 @@
-/*
- * transupp.c
- *
- * 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 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.
- */
-
-/* Although this file really shouldn't have access to the library internals,
- * it's helpful to let it call jround_up() and jcopy_block_row().
- */
-#define JPEG_INTERNALS
-
-#include "jinclude.h"
-#include "jpeglib.h"
-#include "transupp.h"		/* My own external interface */
-
-
-#if TRANSFORMS_SUPPORTED
-
-/*
- * Lossless image transformation routines.  These routines work on DCT
- * coefficient arrays and thus do not require any lossy decompression
- * or recompression of the image.
- * Thanks to Guido Vollbeding for the initial design and code of this feature.
- *
- * Horizontal flipping is done in-place, using a single top-to-bottom
- * pass through the virtual source array.  It will thus be much the
- * fastest option for images larger than main memory.
- *
- * The other routines require a set of destination virtual arrays, so they
- * need twice as much memory as jpegtran normally does.  The destination
- * arrays are always written in normal scan order (top to bottom) because
- * the virtual array manager expects this.  The source arrays will be scanned
- * in the corresponding order, which means multiple passes through the source
- * arrays for most of the transforms.  That could result in much thrashing
- * if the image is larger than main memory.
- *
- * Some notes about the operating environment of the individual transform
- * routines:
- * 1. Both the source and destination virtual arrays are allocated from the
- *    source JPEG object, and therefore should be manipulated by calling the
- *    source's memory manager.
- * 2. The destination's component count should be used.  It may be smaller
- *    than the source's when forcing to grayscale.
- * 3. Likewise the destination's sampling factors should be used.  When
- *    forcing to grayscale the destination's sampling factors will be all 1,
- *    and we may as well take that as the effective iMCU size.
- * 4. When "trim" is in effect, the destination's dimensions will be the
- *    trimmed values but the source's will be untrimmed.
- * 5. All the routines assume that the source and destination buffers are
- *    padded out to a full iMCU boundary.  This is true, although for the
- *    source buffer it is an undocumented property of jdcoefct.c.
- * Notes 2,3,4 boil down to this: generally we should use the destination's
- * dimensions and ignore the source's.
- */
-
-
-LOCAL(void)
-do_flip_h (j_decompress_ptr srcinfo, j_compress_ptr dstinfo,
-	   jvirt_barray_ptr *src_coef_arrays)
-/* Horizontal flip; done in-place, so no separate dest array is required */
-{
-  JDIMENSION MCU_cols, comp_width, blk_x, blk_y;
-  int ci, k, offset_y;
-  JBLOCKARRAY buffer;
-  JCOEFPTR ptr1, ptr2;
-  JCOEF temp1, temp2;
-  jpeg_component_info *compptr;
-
-  /* Horizontal mirroring of DCT blocks is accomplished by swapping
-   * pairs of blocks in-place.  Within a DCT block, we perform horizontal
-   * mirroring by changing the signs of odd-numbered columns.
-   * Partial iMCUs at the right edge are left untouched.
-   */
-  MCU_cols = dstinfo->image_width / (dstinfo->max_h_samp_factor * DCTSIZE);
-
-  for (ci = 0; ci < dstinfo->num_components; ci++) {
-    compptr = dstinfo->comp_info + ci;
-    comp_width = MCU_cols * compptr->h_samp_factor;
-    for (blk_y = 0; blk_y < compptr->height_in_blocks;
-	 blk_y += compptr->v_samp_factor) {
-      buffer = (*srcinfo->mem->access_virt_barray)
-	((j_common_ptr) srcinfo, src_coef_arrays[ci], blk_y,
-	 (JDIMENSION) compptr->v_samp_factor, TRUE);
-      for (offset_y = 0; offset_y < compptr->v_samp_factor; offset_y++) {
-	for (blk_x = 0; blk_x * 2 < comp_width; blk_x++) {
-	  ptr1 = buffer[offset_y][blk_x];
-	  ptr2 = buffer[offset_y][comp_width - blk_x - 1];
-	  /* this unrolled loop doesn't need to know which row it's on... */
-	  for (k = 0; k < DCTSIZE2; k += 2) {
-	    temp1 = *ptr1;	/* swap even column */
-	    temp2 = *ptr2;
-	    *ptr1++ = temp2;
-	    *ptr2++ = temp1;
-	    temp1 = *ptr1;	/* swap odd column with sign change */
-	    temp2 = *ptr2;
-	    *ptr1++ = -temp2;
-	    *ptr2++ = -temp1;
-	  }
-	}
-      }
-    }
-  }
-}
-
-
-LOCAL(void)
-do_flip_v (j_decompress_ptr srcinfo, j_compress_ptr dstinfo,
-	   jvirt_barray_ptr *src_coef_arrays,
-	   jvirt_barray_ptr *dst_coef_arrays)
-/* Vertical flip */
-{
-  JDIMENSION MCU_rows, comp_height, dst_blk_x, dst_blk_y;
-  int ci, i, j, offset_y;
-  JBLOCKARRAY src_buffer, dst_buffer;
-  JBLOCKROW src_row_ptr, dst_row_ptr;
-  JCOEFPTR src_ptr, dst_ptr;
-  jpeg_component_info *compptr;
-
-  /* We output into a separate array because we can't touch different
-   * rows of the source virtual array simultaneously.  Otherwise, this
-   * is a pretty straightforward analog of horizontal flip.
-   * Within a DCT block, vertical mirroring is done by changing the signs
-   * of odd-numbered rows.
-   * Partial iMCUs at the bottom edge are copied verbatim.
-   */
-  MCU_rows = dstinfo->image_height / (dstinfo->max_v_samp_factor * DCTSIZE);
-
-  for (ci = 0; ci < dstinfo->num_components; ci++) {
-    compptr = dstinfo->comp_info + ci;
-    comp_height = MCU_rows * compptr->v_samp_factor;
-    for (dst_blk_y = 0; dst_blk_y < compptr->height_in_blocks;
-	 dst_blk_y += compptr->v_samp_factor) {
-      dst_buffer = (*srcinfo->mem->access_virt_barray)
-	((j_common_ptr) srcinfo, dst_coef_arrays[ci], dst_blk_y,
-	 (JDIMENSION) compptr->v_samp_factor, TRUE);
-      if (dst_blk_y < comp_height) {
-	/* Row is within the mirrorable area. */
-	src_buffer = (*srcinfo->mem->access_virt_barray)
-	  ((j_common_ptr) srcinfo, src_coef_arrays[ci],
-	   comp_height - dst_blk_y - (JDIMENSION) compptr->v_samp_factor,
-	   (JDIMENSION) compptr->v_samp_factor, FALSE);
-      } else {
-	/* Bottom-edge blocks will be copied verbatim. */
-	src_buffer = (*srcinfo->mem->access_virt_barray)
-	  ((j_common_ptr) srcinfo, src_coef_arrays[ci], dst_blk_y,
-	   (JDIMENSION) compptr->v_samp_factor, FALSE);
-      }
-      for (offset_y = 0; offset_y < compptr->v_samp_factor; offset_y++) {
-	if (dst_blk_y < comp_height) {
-	  /* Row is within the mirrorable area. */
-	  dst_row_ptr = dst_buffer[offset_y];
-	  src_row_ptr = src_buffer[compptr->v_samp_factor - offset_y - 1];
-	  for (dst_blk_x = 0; dst_blk_x < compptr->width_in_blocks;
-	       dst_blk_x++) {
-	    dst_ptr = dst_row_ptr[dst_blk_x];
-	    src_ptr = src_row_ptr[dst_blk_x];
-	    for (i = 0; i < DCTSIZE; i += 2) {
-	      /* copy even row */
-	      for (j = 0; j < DCTSIZE; j++)
-		*dst_ptr++ = *src_ptr++;
-	      /* copy odd row with sign change */
-	      for (j = 0; j < DCTSIZE; j++)
-		*dst_ptr++ = - *src_ptr++;
-	    }
-	  }
-	} else {
-	  /* Just copy row verbatim. */
-	  jcopy_block_row(src_buffer[offset_y], dst_buffer[offset_y],
-			  compptr->width_in_blocks);
-	}
-      }
-    }
-  }
-}
-
-
-LOCAL(void)
-do_transpose (j_decompress_ptr srcinfo, j_compress_ptr dstinfo,
-	      jvirt_barray_ptr *src_coef_arrays,
-	      jvirt_barray_ptr *dst_coef_arrays)
-/* Transpose source into destination */
-{
-  JDIMENSION dst_blk_x, dst_blk_y;
-  int ci, i, j, offset_x, offset_y;
-  JBLOCKARRAY src_buffer, dst_buffer;
-  JCOEFPTR src_ptr, dst_ptr;
-  jpeg_component_info *compptr;
-
-  /* Transposing pixels within a block just requires transposing the
-   * DCT coefficients.
-   * Partial iMCUs at the edges require no special treatment; we simply
-   * process all the available DCT blocks for every component.
-   */
-  for (ci = 0; ci < dstinfo->num_components; ci++) {
-    compptr = dstinfo->comp_info + ci;
-    for (dst_blk_y = 0; dst_blk_y < compptr->height_in_blocks;
-	 dst_blk_y += compptr->v_samp_factor) {
-      dst_buffer = (*srcinfo->mem->access_virt_barray)
-	((j_common_ptr) srcinfo, dst_coef_arrays[ci], dst_blk_y,
-	 (JDIMENSION) compptr->v_samp_factor, TRUE);
-      for (offset_y = 0; offset_y < compptr->v_samp_factor; offset_y++) {
-	for (dst_blk_x = 0; dst_blk_x < compptr->width_in_blocks;
-	     dst_blk_x += compptr->h_samp_factor) {
-	  src_buffer = (*srcinfo->mem->access_virt_barray)
-	    ((j_common_ptr) srcinfo, src_coef_arrays[ci], dst_blk_x,
-	     (JDIMENSION) compptr->h_samp_factor, FALSE);
-	  for (offset_x = 0; offset_x < compptr->h_samp_factor; offset_x++) {
-	    src_ptr = src_buffer[offset_x][dst_blk_y + offset_y];
-	    dst_ptr = dst_buffer[offset_y][dst_blk_x + offset_x];
-	    for (i = 0; i < DCTSIZE; i++)
-	      for (j = 0; j < DCTSIZE; j++)
-		dst_ptr[j*DCTSIZE+i] = src_ptr[i*DCTSIZE+j];
-	  }
-	}
-      }
-    }
-  }
-}
-
-
-LOCAL(void)
-do_rot_90 (j_decompress_ptr srcinfo, j_compress_ptr dstinfo,
-	   jvirt_barray_ptr *src_coef_arrays,
-	   jvirt_barray_ptr *dst_coef_arrays)
-/* 90 degree rotation is equivalent to
- *   1. Transposing the image;
- *   2. Horizontal mirroring.
- * These two steps are merged into a single processing routine.
- */
-{
-  JDIMENSION MCU_cols, comp_width, dst_blk_x, dst_blk_y;
-  int ci, i, j, offset_x, offset_y;
-  JBLOCKARRAY src_buffer, dst_buffer;
-  JCOEFPTR src_ptr, dst_ptr;
-  jpeg_component_info *compptr;
-
-  /* Because of the horizontal mirror step, we can't process partial iMCUs
-   * at the (output) right edge properly.  They just get transposed and
-   * not mirrored.
-   */
-  MCU_cols = dstinfo->image_width / (dstinfo->max_h_samp_factor * DCTSIZE);
-
-  for (ci = 0; ci < dstinfo->num_components; ci++) {
-    compptr = dstinfo->comp_info + ci;
-    comp_width = MCU_cols * compptr->h_samp_factor;
-    for (dst_blk_y = 0; dst_blk_y < compptr->height_in_blocks;
-	 dst_blk_y += compptr->v_samp_factor) {
-      dst_buffer = (*srcinfo->mem->access_virt_barray)
-	((j_common_ptr) srcinfo, dst_coef_arrays[ci], dst_blk_y,
-	 (JDIMENSION) compptr->v_samp_factor, TRUE);
-      for (offset_y = 0; offset_y < compptr->v_samp_factor; offset_y++) {
-	for (dst_blk_x = 0; dst_blk_x < compptr->width_in_blocks;
-	     dst_blk_x += compptr->h_samp_factor) {
-	  src_buffer = (*srcinfo->mem->access_virt_barray)
-	    ((j_common_ptr) srcinfo, src_coef_arrays[ci], dst_blk_x,
-	     (JDIMENSION) compptr->h_samp_factor, FALSE);
-	  for (offset_x = 0; offset_x < compptr->h_samp_factor; offset_x++) {
-	    src_ptr = src_buffer[offset_x][dst_blk_y + offset_y];
-	    if (dst_blk_x < comp_width) {
-	      /* Block is within the mirrorable area. */
-	      dst_ptr = dst_buffer[offset_y]
-		[comp_width - dst_blk_x - offset_x - 1];
-	      for (i = 0; i < DCTSIZE; i++) {
-		for (j = 0; j < DCTSIZE; j++)
-		  dst_ptr[j*DCTSIZE+i] = src_ptr[i*DCTSIZE+j];
-		i++;
-		for (j = 0; j < DCTSIZE; j++)
-		  dst_ptr[j*DCTSIZE+i] = -src_ptr[i*DCTSIZE+j];
-	      }
-	    } else {
-	      /* Edge blocks are transposed but not mirrored. */
-	      dst_ptr = dst_buffer[offset_y][dst_blk_x + offset_x];
-	      for (i = 0; i < DCTSIZE; i++)
-		for (j = 0; j < DCTSIZE; j++)
-		  dst_ptr[j*DCTSIZE+i] = src_ptr[i*DCTSIZE+j];
-	    }
-	  }
-	}
-      }
-    }
-  }
-}
-
-
-LOCAL(void)
-do_rot_270 (j_decompress_ptr srcinfo, j_compress_ptr dstinfo,
-	    jvirt_barray_ptr *src_coef_arrays,
-	    jvirt_barray_ptr *dst_coef_arrays)
-/* 270 degree rotation is equivalent to
- *   1. Horizontal mirroring;
- *   2. Transposing the image.
- * These two steps are merged into a single processing routine.
- */
-{
-  JDIMENSION MCU_rows, comp_height, dst_blk_x, dst_blk_y;
-  int ci, i, j, offset_x, offset_y;
-  JBLOCKARRAY src_buffer, dst_buffer;
-  JCOEFPTR src_ptr, dst_ptr;
-  jpeg_component_info *compptr;
-
-  /* Because of the horizontal mirror step, we can't process partial iMCUs
-   * at the (output) bottom edge properly.  They just get transposed and
-   * not mirrored.
-   */
-  MCU_rows = dstinfo->image_height / (dstinfo->max_v_samp_factor * DCTSIZE);
-
-  for (ci = 0; ci < dstinfo->num_components; ci++) {
-    compptr = dstinfo->comp_info + ci;
-    comp_height = MCU_rows * compptr->v_samp_factor;
-    for (dst_blk_y = 0; dst_blk_y < compptr->height_in_blocks;
-	 dst_blk_y += compptr->v_samp_factor) {
-      dst_buffer = (*srcinfo->mem->access_virt_barray)
-	((j_common_ptr) srcinfo, dst_coef_arrays[ci], dst_blk_y,
-	 (JDIMENSION) compptr->v_samp_factor, TRUE);
-      for (offset_y = 0; offset_y < compptr->v_samp_factor; offset_y++) {
-	for (dst_blk_x = 0; dst_blk_x < compptr->width_in_blocks;
-	     dst_blk_x += compptr->h_samp_factor) {
-	  src_buffer = (*srcinfo->mem->access_virt_barray)
-	    ((j_common_ptr) srcinfo, src_coef_arrays[ci], dst_blk_x,
-	     (JDIMENSION) compptr->h_samp_factor, FALSE);
-	  for (offset_x = 0; offset_x < compptr->h_samp_factor; offset_x++) {
-	    dst_ptr = dst_buffer[offset_y][dst_blk_x + offset_x];
-	    if (dst_blk_y < comp_height) {
-	      /* Block is within the mirrorable area. */
-	      src_ptr = src_buffer[offset_x]
-		[comp_height - dst_blk_y - offset_y - 1];
-	      for (i = 0; i < DCTSIZE; i++) {
-		for (j = 0; j < DCTSIZE; j++) {
-		  dst_ptr[j*DCTSIZE+i] = src_ptr[i*DCTSIZE+j];
-		  j++;
-		  dst_ptr[j*DCTSIZE+i] = -src_ptr[i*DCTSIZE+j];
-		}
-	      }
-	    } else {
-	      /* Edge blocks are transposed but not mirrored. */
-	      src_ptr = src_buffer[offset_x][dst_blk_y + offset_y];
-	      for (i = 0; i < DCTSIZE; i++)
-		for (j = 0; j < DCTSIZE; j++)
-		  dst_ptr[j*DCTSIZE+i] = src_ptr[i*DCTSIZE+j];
-	    }
-	  }
-	}
-      }
-    }
-  }
-}
-
-
-LOCAL(void)
-do_rot_180 (j_decompress_ptr srcinfo, j_compress_ptr dstinfo,
-	    jvirt_barray_ptr *src_coef_arrays,
-	    jvirt_barray_ptr *dst_coef_arrays)
-/* 180 degree rotation is equivalent to
- *   1. Vertical mirroring;
- *   2. Horizontal mirroring.
- * These two steps are merged into a single processing routine.
- */
-{
-  JDIMENSION MCU_cols, MCU_rows, comp_width, comp_height, dst_blk_x, dst_blk_y;
-  int ci, i, j, offset_y;
-  JBLOCKARRAY src_buffer, dst_buffer;
-  JBLOCKROW src_row_ptr, dst_row_ptr;
-  JCOEFPTR src_ptr, dst_ptr;
-  jpeg_component_info *compptr;
-
-  MCU_cols = dstinfo->image_width / (dstinfo->max_h_samp_factor * DCTSIZE);
-  MCU_rows = dstinfo->image_height / (dstinfo->max_v_samp_factor * DCTSIZE);
-
-  for (ci = 0; ci < dstinfo->num_components; ci++) {
-    compptr = dstinfo->comp_info + ci;
-    comp_width = MCU_cols * compptr->h_samp_factor;
-    comp_height = MCU_rows * compptr->v_samp_factor;
-    for (dst_blk_y = 0; dst_blk_y < compptr->height_in_blocks;
-	 dst_blk_y += compptr->v_samp_factor) {
-      dst_buffer = (*srcinfo->mem->access_virt_barray)
-	((j_common_ptr) srcinfo, dst_coef_arrays[ci], dst_blk_y,
-	 (JDIMENSION) compptr->v_samp_factor, TRUE);
-      if (dst_blk_y < comp_height) {
-	/* Row is within the vertically mirrorable area. */
-	src_buffer = (*srcinfo->mem->access_virt_barray)
-	  ((j_common_ptr) srcinfo, src_coef_arrays[ci],
-	   comp_height - dst_blk_y - (JDIMENSION) compptr->v_samp_factor,
-	   (JDIMENSION) compptr->v_samp_factor, FALSE);
-      } else {
-	/* Bottom-edge rows are only mirrored horizontally. */
-	src_buffer = (*srcinfo->mem->access_virt_barray)
-	  ((j_common_ptr) srcinfo, src_coef_arrays[ci], dst_blk_y,
-	   (JDIMENSION) compptr->v_samp_factor, FALSE);
-      }
-      for (offset_y = 0; offset_y < compptr->v_samp_factor; offset_y++) {
-	if (dst_blk_y < comp_height) {
-	  /* Row is within the mirrorable area. */
-	  dst_row_ptr = dst_buffer[offset_y];
-	  src_row_ptr = src_buffer[compptr->v_samp_factor - offset_y - 1];
-	  /* Process the blocks that can be mirrored both ways. */
-	  for (dst_blk_x = 0; dst_blk_x < comp_width; dst_blk_x++) {
-	    dst_ptr = dst_row_ptr[dst_blk_x];
-	    src_ptr = src_row_ptr[comp_width - dst_blk_x - 1];
-	    for (i = 0; i < DCTSIZE; i += 2) {
-	      /* For even row, negate every odd column. */
-	      for (j = 0; j < DCTSIZE; j += 2) {
-		*dst_ptr++ = *src_ptr++;
-		*dst_ptr++ = - *src_ptr++;
-	      }
-	      /* For odd row, negate every even column. */
-	      for (j = 0; j < DCTSIZE; j += 2) {
-		*dst_ptr++ = - *src_ptr++;
-		*dst_ptr++ = *src_ptr++;
-	      }
-	    }
-	  }
-	  /* Any remaining right-edge blocks are only mirrored vertically. */
-	  for (; dst_blk_x < compptr->width_in_blocks; dst_blk_x++) {
-	    dst_ptr = dst_row_ptr[dst_blk_x];
-	    src_ptr = src_row_ptr[dst_blk_x];
-	    for (i = 0; i < DCTSIZE; i += 2) {
-	      for (j = 0; j < DCTSIZE; j++)
-		*dst_ptr++ = *src_ptr++;
-	      for (j = 0; j < DCTSIZE; j++)
-		*dst_ptr++ = - *src_ptr++;
-	    }
-	  }
-	} else {
-	  /* Remaining rows are just mirrored horizontally. */
-	  dst_row_ptr = dst_buffer[offset_y];
-	  src_row_ptr = src_buffer[offset_y];
-	  /* Process the blocks that can be mirrored. */
-	  for (dst_blk_x = 0; dst_blk_x < comp_width; dst_blk_x++) {
-	    dst_ptr = dst_row_ptr[dst_blk_x];
-	    src_ptr = src_row_ptr[comp_width - dst_blk_x - 1];
-	    for (i = 0; i < DCTSIZE2; i += 2) {
-	      *dst_ptr++ = *src_ptr++;
-	      *dst_ptr++ = - *src_ptr++;
-	    }
-	  }
-	  /* Any remaining right-edge blocks are only copied. */
-	  for (; dst_blk_x < compptr->width_in_blocks; dst_blk_x++) {
-	    dst_ptr = dst_row_ptr[dst_blk_x];
-	    src_ptr = src_row_ptr[dst_blk_x];
-	    for (i = 0; i < DCTSIZE2; i++)
-	      *dst_ptr++ = *src_ptr++;
-	  }
-	}
-      }
-    }
-  }
-}
-
-
-LOCAL(void)
-do_transverse (j_decompress_ptr srcinfo, j_compress_ptr dstinfo,
-	       jvirt_barray_ptr *src_coef_arrays,
-	       jvirt_barray_ptr *dst_coef_arrays)
-/* Transverse transpose is equivalent to
- *   1. 180 degree rotation;
- *   2. Transposition;
- * or
- *   1. Horizontal mirroring;
- *   2. Transposition;
- *   3. Horizontal mirroring.
- * These steps are merged into a single processing routine.
- */
-{
-  JDIMENSION MCU_cols, MCU_rows, comp_width, comp_height, dst_blk_x, dst_blk_y;
-  int ci, i, j, offset_x, offset_y;
-  JBLOCKARRAY src_buffer, dst_buffer;
-  JCOEFPTR src_ptr, dst_ptr;
-  jpeg_component_info *compptr;
-
-  MCU_cols = dstinfo->image_width / (dstinfo->max_h_samp_factor * DCTSIZE);
-  MCU_rows = dstinfo->image_height / (dstinfo->max_v_samp_factor * DCTSIZE);
-
-  for (ci = 0; ci < dstinfo->num_components; ci++) {
-    compptr = dstinfo->comp_info + ci;
-    comp_width = MCU_cols * compptr->h_samp_factor;
-    comp_height = MCU_rows * compptr->v_samp_factor;
-    for (dst_blk_y = 0; dst_blk_y < compptr->height_in_blocks;
-	 dst_blk_y += compptr->v_samp_factor) {
-      dst_buffer = (*srcinfo->mem->access_virt_barray)
-	((j_common_ptr) srcinfo, dst_coef_arrays[ci], dst_blk_y,
-	 (JDIMENSION) compptr->v_samp_factor, TRUE);
-      for (offset_y = 0; offset_y < compptr->v_samp_factor; offset_y++) {
-	for (dst_blk_x = 0; dst_blk_x < compptr->width_in_blocks;
-	     dst_blk_x += compptr->h_samp_factor) {
-	  src_buffer = (*srcinfo->mem->access_virt_barray)
-	    ((j_common_ptr) srcinfo, src_coef_arrays[ci], dst_blk_x,
-	     (JDIMENSION) compptr->h_samp_factor, FALSE);
-	  for (offset_x = 0; offset_x < compptr->h_samp_factor; offset_x++) {
-	    if (dst_blk_y < comp_height) {
-	      src_ptr = src_buffer[offset_x]
-		[comp_height - dst_blk_y - offset_y - 1];
-	      if (dst_blk_x < comp_width) {
-		/* Block is within the mirrorable area. */
-		dst_ptr = dst_buffer[offset_y]
-		  [comp_width - dst_blk_x - offset_x - 1];
-		for (i = 0; i < DCTSIZE; i++) {
-		  for (j = 0; j < DCTSIZE; j++) {
-		    dst_ptr[j*DCTSIZE+i] = src_ptr[i*DCTSIZE+j];
-		    j++;
-		    dst_ptr[j*DCTSIZE+i] = -src_ptr[i*DCTSIZE+j];
-		  }
-		  i++;
-		  for (j = 0; j < DCTSIZE; j++) {
-		    dst_ptr[j*DCTSIZE+i] = -src_ptr[i*DCTSIZE+j];
-		    j++;
-		    dst_ptr[j*DCTSIZE+i] = src_ptr[i*DCTSIZE+j];
-		  }
-		}
-	      } else {
-		/* Right-edge blocks are mirrored in y only */
-		dst_ptr = dst_buffer[offset_y][dst_blk_x + offset_x];
-		for (i = 0; i < DCTSIZE; i++) {
-		  for (j = 0; j < DCTSIZE; j++) {
-		    dst_ptr[j*DCTSIZE+i] = src_ptr[i*DCTSIZE+j];
-		    j++;
-		    dst_ptr[j*DCTSIZE+i] = -src_ptr[i*DCTSIZE+j];
-		  }
-		}
-	      }
-	    } else {
-	      src_ptr = src_buffer[offset_x][dst_blk_y + offset_y];
-	      if (dst_blk_x < comp_width) {
-		/* Bottom-edge blocks are mirrored in x only */
-		dst_ptr = dst_buffer[offset_y]
-		  [comp_width - dst_blk_x - offset_x - 1];
-		for (i = 0; i < DCTSIZE; i++) {
-		  for (j = 0; j < DCTSIZE; j++)
-		    dst_ptr[j*DCTSIZE+i] = src_ptr[i*DCTSIZE+j];
-		  i++;
-		  for (j = 0; j < DCTSIZE; j++)
-		    dst_ptr[j*DCTSIZE+i] = -src_ptr[i*DCTSIZE+j];
-		}
-	      } else {
-		/* At lower right corner, just transpose, no mirroring */
-		dst_ptr = dst_buffer[offset_y][dst_blk_x + offset_x];
-		for (i = 0; i < DCTSIZE; i++)
-		  for (j = 0; j < DCTSIZE; j++)
-		    dst_ptr[j*DCTSIZE+i] = src_ptr[i*DCTSIZE+j];
-	      }
-	    }
-	  }
-	}
-      }
-    }
-  }
-}
-
-
-/* Request any required workspace.
- *
- * We allocate the workspace virtual arrays from the source decompression
- * object, so that all the arrays (both the original data and the workspace)
- * will be taken into account while making memory management decisions.
- * Hence, this routine must be called after jpeg_read_header (which reads
- * the image dimensions) and before jpeg_read_coefficients (which realizes
- * the source's virtual arrays).
- */
-
-GLOBAL(void)
-jtransform_request_workspace (j_decompress_ptr srcinfo,
-			      jpeg_transform_info *info)
-{
-  jvirt_barray_ptr *coef_arrays = NULL;
-  jpeg_component_info *compptr;
-  int ci;
-
-  if (info->force_grayscale &&
-      srcinfo->jpeg_color_space == JCS_YCbCr &&
-      srcinfo->num_components == 3) {
-    /* We'll only process the first component */
-    info->num_components = 1;
-  } else {
-    /* Process all the components */
-    info->num_components = srcinfo->num_components;
-  }
-
-  switch (info->transform) {
-  case JXFORM_NONE:
-  case JXFORM_FLIP_H:
-    /* Don't need a workspace array */
-    break;
-  case JXFORM_FLIP_V:
-  case JXFORM_ROT_180:
-    /* Need workspace arrays having same dimensions as source image.
-     * Note that we allocate arrays padded out to the next iMCU boundary,
-     * so that transform routines need not worry about missing edge blocks.
-     */
-    coef_arrays = (jvirt_barray_ptr *)
-      (*srcinfo->mem->alloc_small) ((j_common_ptr) srcinfo, JPOOL_IMAGE,
-	SIZEOF(jvirt_barray_ptr) * info->num_components);
-    for (ci = 0; ci < info->num_components; ci++) {
-      compptr = srcinfo->comp_info + ci;
-      coef_arrays[ci] = (*srcinfo->mem->request_virt_barray)
-	((j_common_ptr) srcinfo, JPOOL_IMAGE, FALSE,
-	 (JDIMENSION) jround_up((long) compptr->width_in_blocks,
-				(long) compptr->h_samp_factor),
-	 (JDIMENSION) jround_up((long) compptr->height_in_blocks,
-				(long) compptr->v_samp_factor),
-	 (JDIMENSION) compptr->v_samp_factor);
-    }
-    break;
-  case JXFORM_TRANSPOSE:
-  case JXFORM_TRANSVERSE:
-  case JXFORM_ROT_90:
-  case JXFORM_ROT_270:
-    /* Need workspace arrays having transposed dimensions.
-     * Note that we allocate arrays padded out to the next iMCU boundary,
-     * so that transform routines need not worry about missing edge blocks.
-     */
-    coef_arrays = (jvirt_barray_ptr *)
-      (*srcinfo->mem->alloc_small) ((j_common_ptr) srcinfo, JPOOL_IMAGE,
-	SIZEOF(jvirt_barray_ptr) * info->num_components);
-    for (ci = 0; ci < info->num_components; ci++) {
-      compptr = srcinfo->comp_info + ci;
-      coef_arrays[ci] = (*srcinfo->mem->request_virt_barray)
-	((j_common_ptr) srcinfo, JPOOL_IMAGE, FALSE,
-	 (JDIMENSION) jround_up((long) compptr->height_in_blocks,
-				(long) compptr->v_samp_factor),
-	 (JDIMENSION) jround_up((long) compptr->width_in_blocks,
-				(long) compptr->h_samp_factor),
-	 (JDIMENSION) compptr->h_samp_factor);
-    }
-    break;
-  }
-  info->workspace_coef_arrays = coef_arrays;
-}
-
-
-/* Transpose destination image parameters */
-
-LOCAL(void)
-transpose_critical_parameters (j_compress_ptr dstinfo)
-{
-  int tblno, i, j, ci, itemp;
-  jpeg_component_info *compptr;
-  JQUANT_TBL *qtblptr;
-  JDIMENSION dtemp;
-  UINT16 qtemp;
-
-  /* Transpose basic image dimensions */
-  dtemp = dstinfo->image_width;
-  dstinfo->image_width = dstinfo->image_height;
-  dstinfo->image_height = dtemp;
-
-  /* Transpose sampling factors */
-  for (ci = 0; ci < dstinfo->num_components; ci++) {
-    compptr = dstinfo->comp_info + ci;
-    itemp = compptr->h_samp_factor;
-    compptr->h_samp_factor = compptr->v_samp_factor;
-    compptr->v_samp_factor = itemp;
-  }
-
-  /* Transpose quantization tables */
-  for (tblno = 0; tblno < NUM_QUANT_TBLS; tblno++) {
-    qtblptr = dstinfo->quant_tbl_ptrs[tblno];
-    if (qtblptr != NULL) {
-      for (i = 0; i < DCTSIZE; i++) {
-	for (j = 0; j < i; j++) {
-	  qtemp = qtblptr->quantval[i*DCTSIZE+j];
-	  qtblptr->quantval[i*DCTSIZE+j] = qtblptr->quantval[j*DCTSIZE+i];
-	  qtblptr->quantval[j*DCTSIZE+i] = qtemp;
-	}
-      }
-    }
-  }
-}
-
-
-/* Trim off any partial iMCUs on the indicated destination edge */
-
-LOCAL(void)
-trim_right_edge (j_compress_ptr dstinfo)
-{
-  int ci, max_h_samp_factor;
-  JDIMENSION MCU_cols;
-
-  /* We have to compute max_h_samp_factor ourselves,
-   * because it hasn't been set yet in the destination
-   * (and we don't want to use the source's value).
-   */
-  max_h_samp_factor = 1;
-  for (ci = 0; ci < dstinfo->num_components; ci++) {
-    int h_samp_factor = dstinfo->comp_info[ci].h_samp_factor;
-    max_h_samp_factor = MAX(max_h_samp_factor, h_samp_factor);
-  }
-  MCU_cols = dstinfo->image_width / (max_h_samp_factor * DCTSIZE);
-  if (MCU_cols > 0)		/* can't trim to 0 pixels */
-    dstinfo->image_width = MCU_cols * (max_h_samp_factor * DCTSIZE);
-}
-
-LOCAL(void)
-trim_bottom_edge (j_compress_ptr dstinfo)
-{
-  int ci, max_v_samp_factor;
-  JDIMENSION MCU_rows;
-
-  /* We have to compute max_v_samp_factor ourselves,
-   * because it hasn't been set yet in the destination
-   * (and we don't want to use the source's value).
-   */
-  max_v_samp_factor = 1;
-  for (ci = 0; ci < dstinfo->num_components; ci++) {
-    int v_samp_factor = dstinfo->comp_info[ci].v_samp_factor;
-    max_v_samp_factor = MAX(max_v_samp_factor, v_samp_factor);
-  }
-  MCU_rows = dstinfo->image_height / (max_v_samp_factor * DCTSIZE);
-  if (MCU_rows > 0)		/* can't trim to 0 pixels */
-    dstinfo->image_height = MCU_rows * (max_v_samp_factor * DCTSIZE);
-}
-
-
-/* Adjust output image parameters as needed.
- *
- * This must be called after jpeg_copy_critical_parameters()
- * and before jpeg_write_coefficients().
- *
- * The return value is the set of virtual coefficient arrays to be written
- * (either the ones allocated by jtransform_request_workspace, or the
- * original source data arrays).  The caller will need to pass this value
- * to jpeg_write_coefficients().
- */
-
-GLOBAL(jvirt_barray_ptr *)
-jtransform_adjust_parameters (j_decompress_ptr srcinfo,
-			      j_compress_ptr dstinfo,
-			      jvirt_barray_ptr *src_coef_arrays,
-			      jpeg_transform_info *info)
-{
-  /* If force-to-grayscale is requested, adjust destination parameters */
-  if (info->force_grayscale) {
-    /* We use jpeg_set_colorspace to make sure subsidiary settings get fixed
-     * properly.  Among other things, the target h_samp_factor & v_samp_factor
-     * will get set to 1, which typically won't match the source.
-     * In fact we do this even if the source is already grayscale; that
-     * provides an easy way of coercing a grayscale JPEG with funny sampling
-     * factors to the customary 1,1.  (Some decoders fail on other factors.)
-     */
-    if ((dstinfo->jpeg_color_space == JCS_YCbCr &&
-	 dstinfo->num_components == 3) ||
-	(dstinfo->jpeg_color_space == JCS_GRAYSCALE &&
-	 dstinfo->num_components == 1)) {
-      /* We have to preserve the source's quantization table number. */
-      int sv_quant_tbl_no = dstinfo->comp_info[0].quant_tbl_no;
-      jpeg_set_colorspace(dstinfo, JCS_GRAYSCALE);
-      dstinfo->comp_info[0].quant_tbl_no = sv_quant_tbl_no;
-    } else {
-      /* Sorry, can't do it */
-      ERREXIT(dstinfo, JERR_CONVERSION_NOTIMPL);
-    }
-  }
-
-  /* Correct the destination's image dimensions etc if necessary */
-  switch (info->transform) {
-  case JXFORM_NONE:
-    /* Nothing to do */
-    break;
-  case JXFORM_FLIP_H:
-    if (info->trim)
-      trim_right_edge(dstinfo);
-    break;
-  case JXFORM_FLIP_V:
-    if (info->trim)
-      trim_bottom_edge(dstinfo);
-    break;
-  case JXFORM_TRANSPOSE:
-    transpose_critical_parameters(dstinfo);
-    /* transpose does NOT have to trim anything */
-    break;
-  case JXFORM_TRANSVERSE:
-    transpose_critical_parameters(dstinfo);
-    if (info->trim) {
-      trim_right_edge(dstinfo);
-      trim_bottom_edge(dstinfo);
-    }
-    break;
-  case JXFORM_ROT_90:
-    transpose_critical_parameters(dstinfo);
-    if (info->trim)
-      trim_right_edge(dstinfo);
-    break;
-  case JXFORM_ROT_180:
-    if (info->trim) {
-      trim_right_edge(dstinfo);
-      trim_bottom_edge(dstinfo);
-    }
-    break;
-  case JXFORM_ROT_270:
-    transpose_critical_parameters(dstinfo);
-    if (info->trim)
-      trim_bottom_edge(dstinfo);
-    break;
-  }
-
-  /* Return the appropriate output data set */
-  if (info->workspace_coef_arrays != NULL)
-    return info->workspace_coef_arrays;
-  return src_coef_arrays;
-}
-
-
-/* Execute the actual transformation, if any.
- *
- * This must be called *after* jpeg_write_coefficients, because it depends
- * on jpeg_write_coefficients to have computed subsidiary values such as
- * the per-component width and height fields in the destination object.
- *
- * Note that some transformations will modify the source data arrays!
- */
-
-GLOBAL(void)
-jtransform_execute_transformation (j_decompress_ptr srcinfo,
-				   j_compress_ptr dstinfo,
-				   jvirt_barray_ptr *src_coef_arrays,
-				   jpeg_transform_info *info)
-{
-  jvirt_barray_ptr *dst_coef_arrays = info->workspace_coef_arrays;
-
-  switch (info->transform) {
-  case JXFORM_NONE:
-    break;
-  case JXFORM_FLIP_H:
-    do_flip_h(srcinfo, dstinfo, src_coef_arrays);
-    break;
-  case JXFORM_FLIP_V:
-    do_flip_v(srcinfo, dstinfo, src_coef_arrays, dst_coef_arrays);
-    break;
-  case JXFORM_TRANSPOSE:
-    do_transpose(srcinfo, dstinfo, src_coef_arrays, dst_coef_arrays);
-    break;
-  case JXFORM_TRANSVERSE:
-    do_transverse(srcinfo, dstinfo, src_coef_arrays, dst_coef_arrays);
-    break;
-  case JXFORM_ROT_90:
-    do_rot_90(srcinfo, dstinfo, src_coef_arrays, dst_coef_arrays);
-    break;
-  case JXFORM_ROT_180:
-    do_rot_180(srcinfo, dstinfo, src_coef_arrays, dst_coef_arrays);
-    break;
-  case JXFORM_ROT_270:
-    do_rot_270(srcinfo, dstinfo, src_coef_arrays, dst_coef_arrays);
-    break;
-  }
-}
-
-#endif /* TRANSFORMS_SUPPORTED */
-
-
-/* Setup decompression object to save desired markers in memory.
- * This must be called before jpeg_read_header() to have the desired effect.
- */
-
-GLOBAL(void)
-jcopy_markers_setup (j_decompress_ptr srcinfo, JCOPY_OPTION option)
-{
-#ifdef SAVE_MARKERS_SUPPORTED
-  int m;
-
-  /* Save comments except under NONE option */
-  if (option != JCOPYOPT_NONE) {
-    jpeg_save_markers(srcinfo, JPEG_COM, 0xFFFF);
-  }
-  /* Save all types of APPn markers iff ALL option */
-  if (option == JCOPYOPT_ALL) {
-    for (m = 0; m < 16; m++)
-      jpeg_save_markers(srcinfo, JPEG_APP0 + m, 0xFFFF);
-  }
-#endif /* SAVE_MARKERS_SUPPORTED */
-}
-
-/* Copy markers saved in the given source object to the destination object.
- * This should be called just after jpeg_start_compress() or
- * jpeg_write_coefficients().
- * Note that those routines will have written the SOI, and also the
- * JFIF APP0 or Adobe APP14 markers if selected.
- */
-
-GLOBAL(void)
-jcopy_markers_execute (j_decompress_ptr srcinfo, j_compress_ptr dstinfo,
-		       JCOPY_OPTION option)
-{
-  jpeg_saved_marker_ptr marker;
-
-  /* In the current implementation, we don't actually need to examine the
-   * option flag here; we just copy everything that got saved.
-   * But to avoid confusion, we do not output JFIF and Adobe APP14 markers
-   * if the encoder library already wrote one.
-   */
-  for (marker = srcinfo->marker_list; marker != NULL; marker = marker->next) {
-    if (dstinfo->write_JFIF_header &&
-	marker->marker == JPEG_APP0 &&
-	marker->data_length >= 5 &&
-	GETJOCTET(marker->data[0]) == 0x4A &&
-	GETJOCTET(marker->data[1]) == 0x46 &&
-	GETJOCTET(marker->data[2]) == 0x49 &&
-	GETJOCTET(marker->data[3]) == 0x46 &&
-	GETJOCTET(marker->data[4]) == 0)
-      continue;			/* reject duplicate JFIF */
-    if (dstinfo->write_Adobe_marker &&
-	marker->marker == JPEG_APP0+14 &&
-	marker->data_length >= 5 &&
-	GETJOCTET(marker->data[0]) == 0x41 &&
-	GETJOCTET(marker->data[1]) == 0x64 &&
-	GETJOCTET(marker->data[2]) == 0x6F &&
-	GETJOCTET(marker->data[3]) == 0x62 &&
-	GETJOCTET(marker->data[4]) == 0x65)
-      continue;			/* reject duplicate Adobe */
-#ifdef NEED_FAR_POINTERS
-    /* We could use jpeg_write_marker if the data weren't FAR... */
-    {
-      unsigned int i;
-      jpeg_write_m_header(dstinfo, marker->marker, marker->data_length);
-      for (i = 0; i < marker->data_length; i++)
-	jpeg_write_m_byte(dstinfo, marker->data[i]);
-    }
-#else
-    jpeg_write_marker(dstinfo, marker->marker,
-		      marker->data, marker->data_length);
-#endif
-  }
-}