libjpeg update

git-svn-id: http://svn.miranda-ng.org/main/trunk@5843 1316c22d-e87f-b044-9b9b-93d7a3e3ba9c

1 files changed, 358 insertions, 358 deletions

diff --git a/plugins/AdvaImg/src/LibJPEG/jcprepct.c b/plugins/AdvaImg/src/LibJPEG/jcprepct.c
index be44cc4b45..00101e0b57 100644
--- a/plugins/AdvaImg/src/LibJPEG/jcprepct.c
+++ b/plugins/AdvaImg/src/LibJPEG/jcprepct.c
@@ -1,358 +1,358 @@
-/*
- * jcprepct.c
- *
- * Copyright (C) 1994-1996, 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 the compression preprocessing controller.
- * This controller manages the color conversion, downsampling,
- * and edge expansion steps.
- *
- * Most of the complexity here is associated with buffering input rows
- * as required by the downsampler.  See the comments at the head of
- * jcsample.c for the downsampler's needs.
- */
-
-#define JPEG_INTERNALS
-#include "jinclude.h"
-#include "jpeglib.h"
-
-
-/* At present, jcsample.c can request context rows only for smoothing.
- * In the future, we might also need context rows for CCIR601 sampling
- * or other more-complex downsampling procedures.  The code to support
- * context rows should be compiled only if needed.
- */
-#ifdef INPUT_SMOOTHING_SUPPORTED
-#define CONTEXT_ROWS_SUPPORTED
-#endif
-
-
-/*
- * For the simple (no-context-row) case, we just need to buffer one
- * row group's worth of pixels for the downsampling step.  At the bottom of
- * the image, we pad to a full row group by replicating the last pixel row.
- * The downsampler's last output row is then replicated if needed to pad
- * out to a full iMCU row.
- *
- * When providing context rows, we must buffer three row groups' worth of
- * pixels.  Three row groups are physically allocated, but the row pointer
- * arrays are made five row groups high, with the extra pointers above and
- * below "wrapping around" to point to the last and first real row groups.
- * This allows the downsampler to access the proper context rows.
- * At the top and bottom of the image, we create dummy context rows by
- * copying the first or last real pixel row.  This copying could be avoided
- * by pointer hacking as is done in jdmainct.c, but it doesn't seem worth the
- * trouble on the compression side.
- */
-
-
-/* Private buffer controller object */
-
-typedef struct {
-  struct jpeg_c_prep_controller pub; /* public fields */
-
-  /* Downsampling input buffer.  This buffer holds color-converted data
-   * until we have enough to do a downsample step.
-   */
-  JSAMPARRAY color_buf[MAX_COMPONENTS];
-
-  JDIMENSION rows_to_go;	/* counts rows remaining in source image */
-  int next_buf_row;		/* index of next row to store in color_buf */
-
-#ifdef CONTEXT_ROWS_SUPPORTED	/* only needed for context case */
-  int this_row_group;		/* starting row index of group to process */
-  int next_buf_stop;		/* downsample when we reach this index */
-#endif
-} my_prep_controller;
-
-typedef my_prep_controller * my_prep_ptr;
-
-
-/*
- * Initialize for a processing pass.
- */
-
-METHODDEF(void)
-start_pass_prep (j_compress_ptr cinfo, J_BUF_MODE pass_mode)
-{
-  my_prep_ptr prep = (my_prep_ptr) cinfo->prep;
-
-  if (pass_mode != JBUF_PASS_THRU)
-    ERREXIT(cinfo, JERR_BAD_BUFFER_MODE);
-
-  /* Initialize total-height counter for detecting bottom of image */
-  prep->rows_to_go = cinfo->image_height;
-  /* Mark the conversion buffer empty */
-  prep->next_buf_row = 0;
-#ifdef CONTEXT_ROWS_SUPPORTED
-  /* Preset additional state variables for context mode.
-   * These aren't used in non-context mode, so we needn't test which mode.
-   */
-  prep->this_row_group = 0;
-  /* Set next_buf_stop to stop after two row groups have been read in. */
-  prep->next_buf_stop = 2 * cinfo->max_v_samp_factor;
-#endif
-}
-
-
-/*
- * Expand an image vertically from height input_rows to height output_rows,
- * by duplicating the bottom row.
- */
-
-LOCAL(void)
-expand_bottom_edge (JSAMPARRAY image_data, JDIMENSION num_cols,
-		    int input_rows, int output_rows)
-{
-  register int row;
-
-  for (row = input_rows; row < output_rows; row++) {
-    jcopy_sample_rows(image_data, input_rows-1, image_data, row,
-		      1, num_cols);
-  }
-}
-
-
-/*
- * Process some data in the simple no-context case.
- *
- * Preprocessor output data is counted in "row groups".  A row group
- * is defined to be v_samp_factor sample rows of each component.
- * Downsampling will produce this much data from each max_v_samp_factor
- * input rows.
- */
-
-METHODDEF(void)
-pre_process_data (j_compress_ptr cinfo,
-		  JSAMPARRAY input_buf, JDIMENSION *in_row_ctr,
-		  JDIMENSION in_rows_avail,
-		  JSAMPIMAGE output_buf, JDIMENSION *out_row_group_ctr,
-		  JDIMENSION out_row_groups_avail)
-{
-  my_prep_ptr prep = (my_prep_ptr) cinfo->prep;
-  int numrows, ci;
-  JDIMENSION inrows;
-  jpeg_component_info * compptr;
-
-  while (*in_row_ctr < in_rows_avail &&
-	 *out_row_group_ctr < out_row_groups_avail) {
-    /* Do color conversion to fill the conversion buffer. */
-    inrows = in_rows_avail - *in_row_ctr;
-    numrows = cinfo->max_v_samp_factor - prep->next_buf_row;
-    numrows = (int) MIN((JDIMENSION) numrows, inrows);
-    (*cinfo->cconvert->color_convert) (cinfo, input_buf + *in_row_ctr,
-				       prep->color_buf,
-				       (JDIMENSION) prep->next_buf_row,
-				       numrows);
-    *in_row_ctr += numrows;
-    prep->next_buf_row += numrows;
-    prep->rows_to_go -= numrows;
-    /* If at bottom of image, pad to fill the conversion buffer. */
-    if (prep->rows_to_go == 0 &&
-	prep->next_buf_row < cinfo->max_v_samp_factor) {
-      for (ci = 0; ci < cinfo->num_components; ci++) {
-	expand_bottom_edge(prep->color_buf[ci], cinfo->image_width,
-			   prep->next_buf_row, cinfo->max_v_samp_factor);
-      }
-      prep->next_buf_row = cinfo->max_v_samp_factor;
-    }
-    /* If we've filled the conversion buffer, empty it. */
-    if (prep->next_buf_row == cinfo->max_v_samp_factor) {
-      (*cinfo->downsample->downsample) (cinfo,
-					prep->color_buf, (JDIMENSION) 0,
-					output_buf, *out_row_group_ctr);
-      prep->next_buf_row = 0;
-      (*out_row_group_ctr)++;
-    }
-    /* If at bottom of image, pad the output to a full iMCU height.
-     * Note we assume the caller is providing a one-iMCU-height output buffer!
-     */
-    if (prep->rows_to_go == 0 &&
-	*out_row_group_ctr < out_row_groups_avail) {
-      for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
-	   ci++, compptr++) {
-	numrows = (compptr->v_samp_factor * compptr->DCT_v_scaled_size) /
-		  cinfo->min_DCT_v_scaled_size;
-	expand_bottom_edge(output_buf[ci],
-			   compptr->width_in_blocks * compptr->DCT_h_scaled_size,
-			   (int) (*out_row_group_ctr * numrows),
-			   (int) (out_row_groups_avail * numrows));
-      }
-      *out_row_group_ctr = out_row_groups_avail;
-      break;			/* can exit outer loop without test */
-    }
-  }
-}
-
-
-#ifdef CONTEXT_ROWS_SUPPORTED
-
-/*
- * Process some data in the context case.
- */
-
-METHODDEF(void)
-pre_process_context (j_compress_ptr cinfo,
-		     JSAMPARRAY input_buf, JDIMENSION *in_row_ctr,
-		     JDIMENSION in_rows_avail,
-		     JSAMPIMAGE output_buf, JDIMENSION *out_row_group_ctr,
-		     JDIMENSION out_row_groups_avail)
-{
-  my_prep_ptr prep = (my_prep_ptr) cinfo->prep;
-  int numrows, ci;
-  int buf_height = cinfo->max_v_samp_factor * 3;
-  JDIMENSION inrows;
-
-  while (*out_row_group_ctr < out_row_groups_avail) {
-    if (*in_row_ctr < in_rows_avail) {
-      /* Do color conversion to fill the conversion buffer. */
-      inrows = in_rows_avail - *in_row_ctr;
-      numrows = prep->next_buf_stop - prep->next_buf_row;
-      numrows = (int) MIN((JDIMENSION) numrows, inrows);
-      (*cinfo->cconvert->color_convert) (cinfo, input_buf + *in_row_ctr,
-					 prep->color_buf,
-					 (JDIMENSION) prep->next_buf_row,
-					 numrows);
-      /* Pad at top of image, if first time through */
-      if (prep->rows_to_go == cinfo->image_height) {
-	for (ci = 0; ci < cinfo->num_components; ci++) {
-	  int row;
-	  for (row = 1; row <= cinfo->max_v_samp_factor; row++) {
-	    jcopy_sample_rows(prep->color_buf[ci], 0,
-			      prep->color_buf[ci], -row,
-			      1, cinfo->image_width);
-	  }
-	}
-      }
-      *in_row_ctr += numrows;
-      prep->next_buf_row += numrows;
-      prep->rows_to_go -= numrows;
-    } else {
-      /* Return for more data, unless we are at the bottom of the image. */
-      if (prep->rows_to_go != 0)
-	break;
-      /* When at bottom of image, pad to fill the conversion buffer. */
-      if (prep->next_buf_row < prep->next_buf_stop) {
-	for (ci = 0; ci < cinfo->num_components; ci++) {
-	  expand_bottom_edge(prep->color_buf[ci], cinfo->image_width,
-			     prep->next_buf_row, prep->next_buf_stop);
-	}
-	prep->next_buf_row = prep->next_buf_stop;
-      }
-    }
-    /* If we've gotten enough data, downsample a row group. */
-    if (prep->next_buf_row == prep->next_buf_stop) {
-      (*cinfo->downsample->downsample) (cinfo,
-					prep->color_buf,
-					(JDIMENSION) prep->this_row_group,
-					output_buf, *out_row_group_ctr);
-      (*out_row_group_ctr)++;
-      /* Advance pointers with wraparound as necessary. */
-      prep->this_row_group += cinfo->max_v_samp_factor;
-      if (prep->this_row_group >= buf_height)
-	prep->this_row_group = 0;
-      if (prep->next_buf_row >= buf_height)
-	prep->next_buf_row = 0;
-      prep->next_buf_stop = prep->next_buf_row + cinfo->max_v_samp_factor;
-    }
-  }
-}
-
-
-/*
- * Create the wrapped-around downsampling input buffer needed for context mode.
- */
-
-LOCAL(void)
-create_context_buffer (j_compress_ptr cinfo)
-{
-  my_prep_ptr prep = (my_prep_ptr) cinfo->prep;
-  int rgroup_height = cinfo->max_v_samp_factor;
-  int ci, i;
-  jpeg_component_info * compptr;
-  JSAMPARRAY true_buffer, fake_buffer;
-
-  /* Grab enough space for fake row pointers for all the components;
-   * we need five row groups' worth of pointers for each component.
-   */
-  fake_buffer = (JSAMPARRAY)
-    (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
-				(cinfo->num_components * 5 * rgroup_height) *
-				SIZEOF(JSAMPROW));
-
-  for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
-       ci++, compptr++) {
-    /* Allocate the actual buffer space (3 row groups) for this component.
-     * We make the buffer wide enough to allow the downsampler to edge-expand
-     * horizontally within the buffer, if it so chooses.
-     */
-    true_buffer = (*cinfo->mem->alloc_sarray)
-      ((j_common_ptr) cinfo, JPOOL_IMAGE,
-       (JDIMENSION) (((long) compptr->width_in_blocks *
-		      cinfo->min_DCT_h_scaled_size *
-		      cinfo->max_h_samp_factor) / compptr->h_samp_factor),
-       (JDIMENSION) (3 * rgroup_height));
-    /* Copy true buffer row pointers into the middle of the fake row array */
-    MEMCOPY(fake_buffer + rgroup_height, true_buffer,
-	    3 * rgroup_height * SIZEOF(JSAMPROW));
-    /* Fill in the above and below wraparound pointers */
-    for (i = 0; i < rgroup_height; i++) {
-      fake_buffer[i] = true_buffer[2 * rgroup_height + i];
-      fake_buffer[4 * rgroup_height + i] = true_buffer[i];
-    }
-    prep->color_buf[ci] = fake_buffer + rgroup_height;
-    fake_buffer += 5 * rgroup_height; /* point to space for next component */
-  }
-}
-
-#endif /* CONTEXT_ROWS_SUPPORTED */
-
-
-/*
- * Initialize preprocessing controller.
- */
-
-GLOBAL(void)
-jinit_c_prep_controller (j_compress_ptr cinfo, boolean need_full_buffer)
-{
-  my_prep_ptr prep;
-  int ci;
-  jpeg_component_info * compptr;
-
-  if (need_full_buffer)		/* safety check */
-    ERREXIT(cinfo, JERR_BAD_BUFFER_MODE);
-
-  prep = (my_prep_ptr)
-    (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
-				SIZEOF(my_prep_controller));
-  cinfo->prep = (struct jpeg_c_prep_controller *) prep;
-  prep->pub.start_pass = start_pass_prep;
-
-  /* Allocate the color conversion buffer.
-   * We make the buffer wide enough to allow the downsampler to edge-expand
-   * horizontally within the buffer, if it so chooses.
-   */
-  if (cinfo->downsample->need_context_rows) {
-    /* Set up to provide context rows */
-#ifdef CONTEXT_ROWS_SUPPORTED
-    prep->pub.pre_process_data = pre_process_context;
-    create_context_buffer(cinfo);
-#else
-    ERREXIT(cinfo, JERR_NOT_COMPILED);
-#endif
-  } else {
-    /* No context, just make it tall enough for one row group */
-    prep->pub.pre_process_data = pre_process_data;
-    for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
-	 ci++, compptr++) {
-      prep->color_buf[ci] = (*cinfo->mem->alloc_sarray)
-	((j_common_ptr) cinfo, JPOOL_IMAGE,
-	 (JDIMENSION) (((long) compptr->width_in_blocks *
-			cinfo->min_DCT_h_scaled_size *
-			cinfo->max_h_samp_factor) / compptr->h_samp_factor),
-	 (JDIMENSION) cinfo->max_v_samp_factor);
-    }
-  }
-}
+/*

+ * jcprepct.c

+ *

+ * Copyright (C) 1994-1996, 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 the compression preprocessing controller.

+ * This controller manages the color conversion, downsampling,

+ * and edge expansion steps.

+ *

+ * Most of the complexity here is associated with buffering input rows

+ * as required by the downsampler.  See the comments at the head of

+ * jcsample.c for the downsampler's needs.

+ */

+

+#define JPEG_INTERNALS

+#include "jinclude.h"

+#include "jpeglib.h"

+

+

+/* At present, jcsample.c can request context rows only for smoothing.

+ * In the future, we might also need context rows for CCIR601 sampling

+ * or other more-complex downsampling procedures.  The code to support

+ * context rows should be compiled only if needed.

+ */

+#ifdef INPUT_SMOOTHING_SUPPORTED

+#define CONTEXT_ROWS_SUPPORTED

+#endif

+

+

+/*

+ * For the simple (no-context-row) case, we just need to buffer one

+ * row group's worth of pixels for the downsampling step.  At the bottom of

+ * the image, we pad to a full row group by replicating the last pixel row.

+ * The downsampler's last output row is then replicated if needed to pad

+ * out to a full iMCU row.

+ *

+ * When providing context rows, we must buffer three row groups' worth of

+ * pixels.  Three row groups are physically allocated, but the row pointer

+ * arrays are made five row groups high, with the extra pointers above and

+ * below "wrapping around" to point to the last and first real row groups.

+ * This allows the downsampler to access the proper context rows.

+ * At the top and bottom of the image, we create dummy context rows by

+ * copying the first or last real pixel row.  This copying could be avoided

+ * by pointer hacking as is done in jdmainct.c, but it doesn't seem worth the

+ * trouble on the compression side.

+ */

+

+

+/* Private buffer controller object */

+

+typedef struct {

+  struct jpeg_c_prep_controller pub; /* public fields */

+

+  /* Downsampling input buffer.  This buffer holds color-converted data

+   * until we have enough to do a downsample step.

+   */

+  JSAMPARRAY color_buf[MAX_COMPONENTS];

+

+  JDIMENSION rows_to_go;	/* counts rows remaining in source image */

+  int next_buf_row;		/* index of next row to store in color_buf */

+

+#ifdef CONTEXT_ROWS_SUPPORTED	/* only needed for context case */

+  int this_row_group;		/* starting row index of group to process */

+  int next_buf_stop;		/* downsample when we reach this index */

+#endif

+} my_prep_controller;

+

+typedef my_prep_controller * my_prep_ptr;

+

+

+/*

+ * Initialize for a processing pass.

+ */

+

+METHODDEF(void)

+start_pass_prep (j_compress_ptr cinfo, J_BUF_MODE pass_mode)

+{

+  my_prep_ptr prep = (my_prep_ptr) cinfo->prep;

+

+  if (pass_mode != JBUF_PASS_THRU)

+    ERREXIT(cinfo, JERR_BAD_BUFFER_MODE);

+

+  /* Initialize total-height counter for detecting bottom of image */

+  prep->rows_to_go = cinfo->image_height;

+  /* Mark the conversion buffer empty */

+  prep->next_buf_row = 0;

+#ifdef CONTEXT_ROWS_SUPPORTED

+  /* Preset additional state variables for context mode.

+   * These aren't used in non-context mode, so we needn't test which mode.

+   */

+  prep->this_row_group = 0;

+  /* Set next_buf_stop to stop after two row groups have been read in. */

+  prep->next_buf_stop = 2 * cinfo->max_v_samp_factor;

+#endif

+}

+

+

+/*

+ * Expand an image vertically from height input_rows to height output_rows,

+ * by duplicating the bottom row.

+ */

+

+LOCAL(void)

+expand_bottom_edge (JSAMPARRAY image_data, JDIMENSION num_cols,

+		    int input_rows, int output_rows)

+{

+  register int row;

+

+  for (row = input_rows; row < output_rows; row++) {

+    jcopy_sample_rows(image_data, input_rows-1, image_data, row,

+		      1, num_cols);

+  }

+}

+

+

+/*

+ * Process some data in the simple no-context case.

+ *

+ * Preprocessor output data is counted in "row groups".  A row group

+ * is defined to be v_samp_factor sample rows of each component.

+ * Downsampling will produce this much data from each max_v_samp_factor

+ * input rows.

+ */

+

+METHODDEF(void)

+pre_process_data (j_compress_ptr cinfo,

+		  JSAMPARRAY input_buf, JDIMENSION *in_row_ctr,

+		  JDIMENSION in_rows_avail,

+		  JSAMPIMAGE output_buf, JDIMENSION *out_row_group_ctr,

+		  JDIMENSION out_row_groups_avail)

+{

+  my_prep_ptr prep = (my_prep_ptr) cinfo->prep;

+  int numrows, ci;

+  JDIMENSION inrows;

+  jpeg_component_info * compptr;

+

+  while (*in_row_ctr < in_rows_avail &&

+	 *out_row_group_ctr < out_row_groups_avail) {

+    /* Do color conversion to fill the conversion buffer. */

+    inrows = in_rows_avail - *in_row_ctr;

+    numrows = cinfo->max_v_samp_factor - prep->next_buf_row;

+    numrows = (int) MIN((JDIMENSION) numrows, inrows);

+    (*cinfo->cconvert->color_convert) (cinfo, input_buf + *in_row_ctr,

+				       prep->color_buf,

+				       (JDIMENSION) prep->next_buf_row,

+				       numrows);

+    *in_row_ctr += numrows;

+    prep->next_buf_row += numrows;

+    prep->rows_to_go -= numrows;

+    /* If at bottom of image, pad to fill the conversion buffer. */

+    if (prep->rows_to_go == 0 &&

+	prep->next_buf_row < cinfo->max_v_samp_factor) {

+      for (ci = 0; ci < cinfo->num_components; ci++) {

+	expand_bottom_edge(prep->color_buf[ci], cinfo->image_width,

+			   prep->next_buf_row, cinfo->max_v_samp_factor);

+      }

+      prep->next_buf_row = cinfo->max_v_samp_factor;

+    }

+    /* If we've filled the conversion buffer, empty it. */

+    if (prep->next_buf_row == cinfo->max_v_samp_factor) {

+      (*cinfo->downsample->downsample) (cinfo,

+					prep->color_buf, (JDIMENSION) 0,

+					output_buf, *out_row_group_ctr);

+      prep->next_buf_row = 0;

+      (*out_row_group_ctr)++;

+    }

+    /* If at bottom of image, pad the output to a full iMCU height.

+     * Note we assume the caller is providing a one-iMCU-height output buffer!

+     */

+    if (prep->rows_to_go == 0 &&

+	*out_row_group_ctr < out_row_groups_avail) {

+      for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;

+	   ci++, compptr++) {

+	numrows = (compptr->v_samp_factor * compptr->DCT_v_scaled_size) /

+		  cinfo->min_DCT_v_scaled_size;

+	expand_bottom_edge(output_buf[ci],

+			   compptr->width_in_blocks * compptr->DCT_h_scaled_size,

+			   (int) (*out_row_group_ctr * numrows),

+			   (int) (out_row_groups_avail * numrows));

+      }

+      *out_row_group_ctr = out_row_groups_avail;

+      break;			/* can exit outer loop without test */

+    }

+  }

+}

+

+

+#ifdef CONTEXT_ROWS_SUPPORTED

+

+/*

+ * Process some data in the context case.

+ */

+

+METHODDEF(void)

+pre_process_context (j_compress_ptr cinfo,

+		     JSAMPARRAY input_buf, JDIMENSION *in_row_ctr,

+		     JDIMENSION in_rows_avail,

+		     JSAMPIMAGE output_buf, JDIMENSION *out_row_group_ctr,

+		     JDIMENSION out_row_groups_avail)

+{

+  my_prep_ptr prep = (my_prep_ptr) cinfo->prep;

+  int numrows, ci;

+  int buf_height = cinfo->max_v_samp_factor * 3;

+  JDIMENSION inrows;

+

+  while (*out_row_group_ctr < out_row_groups_avail) {

+    if (*in_row_ctr < in_rows_avail) {

+      /* Do color conversion to fill the conversion buffer. */

+      inrows = in_rows_avail - *in_row_ctr;

+      numrows = prep->next_buf_stop - prep->next_buf_row;

+      numrows = (int) MIN((JDIMENSION) numrows, inrows);

+      (*cinfo->cconvert->color_convert) (cinfo, input_buf + *in_row_ctr,

+					 prep->color_buf,

+					 (JDIMENSION) prep->next_buf_row,

+					 numrows);

+      /* Pad at top of image, if first time through */

+      if (prep->rows_to_go == cinfo->image_height) {

+	for (ci = 0; ci < cinfo->num_components; ci++) {

+	  int row;

+	  for (row = 1; row <= cinfo->max_v_samp_factor; row++) {

+	    jcopy_sample_rows(prep->color_buf[ci], 0,

+			      prep->color_buf[ci], -row,

+			      1, cinfo->image_width);

+	  }

+	}

+      }

+      *in_row_ctr += numrows;

+      prep->next_buf_row += numrows;

+      prep->rows_to_go -= numrows;

+    } else {

+      /* Return for more data, unless we are at the bottom of the image. */

+      if (prep->rows_to_go != 0)

+	break;

+      /* When at bottom of image, pad to fill the conversion buffer. */

+      if (prep->next_buf_row < prep->next_buf_stop) {

+	for (ci = 0; ci < cinfo->num_components; ci++) {

+	  expand_bottom_edge(prep->color_buf[ci], cinfo->image_width,

+			     prep->next_buf_row, prep->next_buf_stop);

+	}

+	prep->next_buf_row = prep->next_buf_stop;

+      }

+    }

+    /* If we've gotten enough data, downsample a row group. */

+    if (prep->next_buf_row == prep->next_buf_stop) {

+      (*cinfo->downsample->downsample) (cinfo,

+					prep->color_buf,

+					(JDIMENSION) prep->this_row_group,

+					output_buf, *out_row_group_ctr);

+      (*out_row_group_ctr)++;

+      /* Advance pointers with wraparound as necessary. */

+      prep->this_row_group += cinfo->max_v_samp_factor;

+      if (prep->this_row_group >= buf_height)

+	prep->this_row_group = 0;

+      if (prep->next_buf_row >= buf_height)

+	prep->next_buf_row = 0;

+      prep->next_buf_stop = prep->next_buf_row + cinfo->max_v_samp_factor;

+    }

+  }

+}

+

+

+/*

+ * Create the wrapped-around downsampling input buffer needed for context mode.

+ */

+

+LOCAL(void)

+create_context_buffer (j_compress_ptr cinfo)

+{

+  my_prep_ptr prep = (my_prep_ptr) cinfo->prep;

+  int rgroup_height = cinfo->max_v_samp_factor;

+  int ci, i;

+  jpeg_component_info * compptr;

+  JSAMPARRAY true_buffer, fake_buffer;

+

+  /* Grab enough space for fake row pointers for all the components;

+   * we need five row groups' worth of pointers for each component.

+   */

+  fake_buffer = (JSAMPARRAY)

+    (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,

+				(cinfo->num_components * 5 * rgroup_height) *

+				SIZEOF(JSAMPROW));

+

+  for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;

+       ci++, compptr++) {

+    /* Allocate the actual buffer space (3 row groups) for this component.

+     * We make the buffer wide enough to allow the downsampler to edge-expand

+     * horizontally within the buffer, if it so chooses.

+     */

+    true_buffer = (*cinfo->mem->alloc_sarray)

+      ((j_common_ptr) cinfo, JPOOL_IMAGE,

+       (JDIMENSION) (((long) compptr->width_in_blocks *

+		      cinfo->min_DCT_h_scaled_size *

+		      cinfo->max_h_samp_factor) / compptr->h_samp_factor),

+       (JDIMENSION) (3 * rgroup_height));

+    /* Copy true buffer row pointers into the middle of the fake row array */

+    MEMCOPY(fake_buffer + rgroup_height, true_buffer,

+	    3 * rgroup_height * SIZEOF(JSAMPROW));

+    /* Fill in the above and below wraparound pointers */

+    for (i = 0; i < rgroup_height; i++) {

+      fake_buffer[i] = true_buffer[2 * rgroup_height + i];

+      fake_buffer[4 * rgroup_height + i] = true_buffer[i];

+    }

+    prep->color_buf[ci] = fake_buffer + rgroup_height;

+    fake_buffer += 5 * rgroup_height; /* point to space for next component */

+  }

+}

+

+#endif /* CONTEXT_ROWS_SUPPORTED */

+

+

+/*

+ * Initialize preprocessing controller.

+ */

+

+GLOBAL(void)

+jinit_c_prep_controller (j_compress_ptr cinfo, boolean need_full_buffer)

+{

+  my_prep_ptr prep;

+  int ci;

+  jpeg_component_info * compptr;

+

+  if (need_full_buffer)		/* safety check */

+    ERREXIT(cinfo, JERR_BAD_BUFFER_MODE);

+

+  prep = (my_prep_ptr)

+    (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,

+				SIZEOF(my_prep_controller));

+  cinfo->prep = (struct jpeg_c_prep_controller *) prep;

+  prep->pub.start_pass = start_pass_prep;

+

+  /* Allocate the color conversion buffer.

+   * We make the buffer wide enough to allow the downsampler to edge-expand

+   * horizontally within the buffer, if it so chooses.

+   */

+  if (cinfo->downsample->need_context_rows) {

+    /* Set up to provide context rows */

+#ifdef CONTEXT_ROWS_SUPPORTED

+    prep->pub.pre_process_data = pre_process_context;

+    create_context_buffer(cinfo);

+#else

+    ERREXIT(cinfo, JERR_NOT_COMPILED);

+#endif

+  } else {

+    /* No context, just make it tall enough for one row group */

+    prep->pub.pre_process_data = pre_process_data;

+    for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;

+	 ci++, compptr++) {

+      prep->color_buf[ci] = (*cinfo->mem->alloc_sarray)

+	((j_common_ptr) cinfo, JPOOL_IMAGE,

+	 (JDIMENSION) (((long) compptr->width_in_blocks *

+			cinfo->min_DCT_h_scaled_size *

+			cinfo->max_h_samp_factor) / compptr->h_samp_factor),

+	 (JDIMENSION) cinfo->max_v_samp_factor);

+    }

+  }

+}