update for zlib & FreeImage

git-svn-id: http://svn.miranda-ng.org/main/trunk@238 1316c22d-e87f-b044-9b9b-93d7a3e3ba9c

1 files changed, 482 insertions, 482 deletions

diff --git a/plugins/FreeImage/Source/LibJPEG/jcdctmgr.c b/plugins/FreeImage/Source/LibJPEG/jcdctmgr.c
index 550b1a6e7c..0bbdbb685d 100644
--- a/plugins/FreeImage/Source/LibJPEG/jcdctmgr.c
+++ b/plugins/FreeImage/Source/LibJPEG/jcdctmgr.c
@@ -1,482 +1,482 @@
-/*

- * jcdctmgr.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 forward-DCT management logic.

- * This code selects a particular DCT implementation to be used,

- * and it performs related housekeeping chores including coefficient

- * quantization.

- */

-

-#define JPEG_INTERNALS

-#include "jinclude.h"

-#include "jpeglib.h"

-#include "jdct.h"		/* Private declarations for DCT subsystem */

-

-

-/* Private subobject for this module */

-

-typedef struct {

-  struct jpeg_forward_dct pub;	/* public fields */

-

-  /* Pointer to the DCT routine actually in use */

-  forward_DCT_method_ptr do_dct[MAX_COMPONENTS];

-

-  /* The actual post-DCT divisors --- not identical to the quant table

-   * entries, because of scaling (especially for an unnormalized DCT).

-   * Each table is given in normal array order.

-   */

-  DCTELEM * divisors[NUM_QUANT_TBLS];

-

-#ifdef DCT_FLOAT_SUPPORTED

-  /* Same as above for the floating-point case. */

-  float_DCT_method_ptr do_float_dct[MAX_COMPONENTS];

-  FAST_FLOAT * float_divisors[NUM_QUANT_TBLS];

-#endif

-} my_fdct_controller;

-

-typedef my_fdct_controller * my_fdct_ptr;

-

-

-/* The current scaled-DCT routines require ISLOW-style divisor tables,

- * so be sure to compile that code if either ISLOW or SCALING is requested.

- */

-#ifdef DCT_ISLOW_SUPPORTED

-#define PROVIDE_ISLOW_TABLES

-#else

-#ifdef DCT_SCALING_SUPPORTED

-#define PROVIDE_ISLOW_TABLES

-#endif

-#endif

-

-

-/*

- * Perform forward DCT on one or more blocks of a component.

- *

- * The input samples are taken from the sample_data[] array starting at

- * position start_row/start_col, and moving to the right for any additional

- * blocks. The quantized coefficients are returned in coef_blocks[].

- */

-

-METHODDEF(void)

-forward_DCT (j_compress_ptr cinfo, jpeg_component_info * compptr,

-	     JSAMPARRAY sample_data, JBLOCKROW coef_blocks,

-	     JDIMENSION start_row, JDIMENSION start_col,

-	     JDIMENSION num_blocks)

-/* This version is used for integer DCT implementations. */

-{

-  /* This routine is heavily used, so it's worth coding it tightly. */

-  my_fdct_ptr fdct = (my_fdct_ptr) cinfo->fdct;

-  forward_DCT_method_ptr do_dct = fdct->do_dct[compptr->component_index];

-  DCTELEM * divisors = fdct->divisors[compptr->quant_tbl_no];

-  DCTELEM workspace[DCTSIZE2];	/* work area for FDCT subroutine */

-  JDIMENSION bi;

-

-  sample_data += start_row;	/* fold in the vertical offset once */

-

-  for (bi = 0; bi < num_blocks; bi++, start_col += compptr->DCT_h_scaled_size) {

-    /* Perform the DCT */

-    (*do_dct) (workspace, sample_data, start_col);

-

-    /* Quantize/descale the coefficients, and store into coef_blocks[] */

-    { register DCTELEM temp, qval;

-      register int i;

-      register JCOEFPTR output_ptr = coef_blocks[bi];

-

-      for (i = 0; i < DCTSIZE2; i++) {

-	qval = divisors[i];

-	temp = workspace[i];

-	/* Divide the coefficient value by qval, ensuring proper rounding.

-	 * Since C does not specify the direction of rounding for negative

-	 * quotients, we have to force the dividend positive for portability.

-	 *

-	 * In most files, at least half of the output values will be zero

-	 * (at default quantization settings, more like three-quarters...)

-	 * so we should ensure that this case is fast.  On many machines,

-	 * a comparison is enough cheaper than a divide to make a special test

-	 * a win.  Since both inputs will be nonnegative, we need only test

-	 * for a < b to discover whether a/b is 0.

-	 * If your machine's division is fast enough, define FAST_DIVIDE.

-	 */

-#ifdef FAST_DIVIDE

-#define DIVIDE_BY(a,b)	a /= b

-#else

-#define DIVIDE_BY(a,b)	if (a >= b) a /= b; else a = 0

-#endif

-	if (temp < 0) {

-	  temp = -temp;

-	  temp += qval>>1;	/* for rounding */

-	  DIVIDE_BY(temp, qval);

-	  temp = -temp;

-	} else {

-	  temp += qval>>1;	/* for rounding */

-	  DIVIDE_BY(temp, qval);

-	}

-	output_ptr[i] = (JCOEF) temp;

-      }

-    }

-  }

-}

-

-

-#ifdef DCT_FLOAT_SUPPORTED

-

-METHODDEF(void)

-forward_DCT_float (j_compress_ptr cinfo, jpeg_component_info * compptr,

-		   JSAMPARRAY sample_data, JBLOCKROW coef_blocks,

-		   JDIMENSION start_row, JDIMENSION start_col,

-		   JDIMENSION num_blocks)

-/* This version is used for floating-point DCT implementations. */

-{

-  /* This routine is heavily used, so it's worth coding it tightly. */

-  my_fdct_ptr fdct = (my_fdct_ptr) cinfo->fdct;

-  float_DCT_method_ptr do_dct = fdct->do_float_dct[compptr->component_index];

-  FAST_FLOAT * divisors = fdct->float_divisors[compptr->quant_tbl_no];

-  FAST_FLOAT workspace[DCTSIZE2]; /* work area for FDCT subroutine */

-  JDIMENSION bi;

-

-  sample_data += start_row;	/* fold in the vertical offset once */

-

-  for (bi = 0; bi < num_blocks; bi++, start_col += compptr->DCT_h_scaled_size) {

-    /* Perform the DCT */

-    (*do_dct) (workspace, sample_data, start_col);

-

-    /* Quantize/descale the coefficients, and store into coef_blocks[] */

-    { register FAST_FLOAT temp;

-      register int i;

-      register JCOEFPTR output_ptr = coef_blocks[bi];

-

-      for (i = 0; i < DCTSIZE2; i++) {

-	/* Apply the quantization and scaling factor */

-	temp = workspace[i] * divisors[i];

-	/* Round to nearest integer.

-	 * Since C does not specify the direction of rounding for negative

-	 * quotients, we have to force the dividend positive for portability.

-	 * The maximum coefficient size is +-16K (for 12-bit data), so this

-	 * code should work for either 16-bit or 32-bit ints.

-	 */

-	output_ptr[i] = (JCOEF) ((int) (temp + (FAST_FLOAT) 16384.5) - 16384);

-      }

-    }

-  }

-}

-

-#endif /* DCT_FLOAT_SUPPORTED */

-

-

-/*

- * Initialize for a processing pass.

- * Verify that all referenced Q-tables are present, and set up

- * the divisor table for each one.

- * In the current implementation, DCT of all components is done during

- * the first pass, even if only some components will be output in the

- * first scan.  Hence all components should be examined here.

- */

-

-METHODDEF(void)

-start_pass_fdctmgr (j_compress_ptr cinfo)

-{

-  my_fdct_ptr fdct = (my_fdct_ptr) cinfo->fdct;

-  int ci, qtblno, i;

-  jpeg_component_info *compptr;

-  int method = 0;

-  JQUANT_TBL * qtbl;

-  DCTELEM * dtbl;

-

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

-       ci++, compptr++) {

-    /* Select the proper DCT routine for this component's scaling */

-    switch ((compptr->DCT_h_scaled_size << 8) + compptr->DCT_v_scaled_size) {

-#ifdef DCT_SCALING_SUPPORTED

-    case ((1 << 8) + 1):

-      fdct->do_dct[ci] = jpeg_fdct_1x1;

-      method = JDCT_ISLOW;	/* jfdctint uses islow-style table */

-      break;

-    case ((2 << 8) + 2):

-      fdct->do_dct[ci] = jpeg_fdct_2x2;

-      method = JDCT_ISLOW;	/* jfdctint uses islow-style table */

-      break;

-    case ((3 << 8) + 3):

-      fdct->do_dct[ci] = jpeg_fdct_3x3;

-      method = JDCT_ISLOW;	/* jfdctint uses islow-style table */

-      break;

-    case ((4 << 8) + 4):

-      fdct->do_dct[ci] = jpeg_fdct_4x4;

-      method = JDCT_ISLOW;	/* jfdctint uses islow-style table */

-      break;

-    case ((5 << 8) + 5):

-      fdct->do_dct[ci] = jpeg_fdct_5x5;

-      method = JDCT_ISLOW;	/* jfdctint uses islow-style table */

-      break;

-    case ((6 << 8) + 6):

-      fdct->do_dct[ci] = jpeg_fdct_6x6;

-      method = JDCT_ISLOW;	/* jfdctint uses islow-style table */

-      break;

-    case ((7 << 8) + 7):

-      fdct->do_dct[ci] = jpeg_fdct_7x7;

-      method = JDCT_ISLOW;	/* jfdctint uses islow-style table */

-      break;

-    case ((9 << 8) + 9):

-      fdct->do_dct[ci] = jpeg_fdct_9x9;

-      method = JDCT_ISLOW;	/* jfdctint uses islow-style table */

-      break;

-    case ((10 << 8) + 10):

-      fdct->do_dct[ci] = jpeg_fdct_10x10;

-      method = JDCT_ISLOW;	/* jfdctint uses islow-style table */

-      break;

-    case ((11 << 8) + 11):

-      fdct->do_dct[ci] = jpeg_fdct_11x11;

-      method = JDCT_ISLOW;	/* jfdctint uses islow-style table */

-      break;

-    case ((12 << 8) + 12):

-      fdct->do_dct[ci] = jpeg_fdct_12x12;

-      method = JDCT_ISLOW;	/* jfdctint uses islow-style table */

-      break;

-    case ((13 << 8) + 13):

-      fdct->do_dct[ci] = jpeg_fdct_13x13;

-      method = JDCT_ISLOW;	/* jfdctint uses islow-style table */

-      break;

-    case ((14 << 8) + 14):

-      fdct->do_dct[ci] = jpeg_fdct_14x14;

-      method = JDCT_ISLOW;	/* jfdctint uses islow-style table */

-      break;

-    case ((15 << 8) + 15):

-      fdct->do_dct[ci] = jpeg_fdct_15x15;

-      method = JDCT_ISLOW;	/* jfdctint uses islow-style table */

-      break;

-    case ((16 << 8) + 16):

-      fdct->do_dct[ci] = jpeg_fdct_16x16;

-      method = JDCT_ISLOW;	/* jfdctint uses islow-style table */

-      break;

-    case ((16 << 8) + 8):

-      fdct->do_dct[ci] = jpeg_fdct_16x8;

-      method = JDCT_ISLOW;	/* jfdctint uses islow-style table */

-      break;

-    case ((14 << 8) + 7):

-      fdct->do_dct[ci] = jpeg_fdct_14x7;

-      method = JDCT_ISLOW;	/* jfdctint uses islow-style table */

-      break;

-    case ((12 << 8) + 6):

-      fdct->do_dct[ci] = jpeg_fdct_12x6;

-      method = JDCT_ISLOW;	/* jfdctint uses islow-style table */

-      break;

-    case ((10 << 8) + 5):

-      fdct->do_dct[ci] = jpeg_fdct_10x5;

-      method = JDCT_ISLOW;	/* jfdctint uses islow-style table */

-      break;

-    case ((8 << 8) + 4):

-      fdct->do_dct[ci] = jpeg_fdct_8x4;

-      method = JDCT_ISLOW;	/* jfdctint uses islow-style table */

-      break;

-    case ((6 << 8) + 3):

-      fdct->do_dct[ci] = jpeg_fdct_6x3;

-      method = JDCT_ISLOW;	/* jfdctint uses islow-style table */

-      break;

-    case ((4 << 8) + 2):

-      fdct->do_dct[ci] = jpeg_fdct_4x2;

-      method = JDCT_ISLOW;	/* jfdctint uses islow-style table */

-      break;

-    case ((2 << 8) + 1):

-      fdct->do_dct[ci] = jpeg_fdct_2x1;

-      method = JDCT_ISLOW;	/* jfdctint uses islow-style table */

-      break;

-    case ((8 << 8) + 16):

-      fdct->do_dct[ci] = jpeg_fdct_8x16;

-      method = JDCT_ISLOW;	/* jfdctint uses islow-style table */

-      break;

-    case ((7 << 8) + 14):

-      fdct->do_dct[ci] = jpeg_fdct_7x14;

-      method = JDCT_ISLOW;	/* jfdctint uses islow-style table */

-      break;

-    case ((6 << 8) + 12):

-      fdct->do_dct[ci] = jpeg_fdct_6x12;

-      method = JDCT_ISLOW;	/* jfdctint uses islow-style table */

-      break;

-    case ((5 << 8) + 10):

-      fdct->do_dct[ci] = jpeg_fdct_5x10;

-      method = JDCT_ISLOW;	/* jfdctint uses islow-style table */

-      break;

-    case ((4 << 8) + 8):

-      fdct->do_dct[ci] = jpeg_fdct_4x8;

-      method = JDCT_ISLOW;	/* jfdctint uses islow-style table */

-      break;

-    case ((3 << 8) + 6):

-      fdct->do_dct[ci] = jpeg_fdct_3x6;

-      method = JDCT_ISLOW;	/* jfdctint uses islow-style table */

-      break;

-    case ((2 << 8) + 4):

-      fdct->do_dct[ci] = jpeg_fdct_2x4;

-      method = JDCT_ISLOW;	/* jfdctint uses islow-style table */

-      break;

-    case ((1 << 8) + 2):

-      fdct->do_dct[ci] = jpeg_fdct_1x2;

-      method = JDCT_ISLOW;	/* jfdctint uses islow-style table */

-      break;

-#endif

-    case ((DCTSIZE << 8) + DCTSIZE):

-      switch (cinfo->dct_method) {

-#ifdef DCT_ISLOW_SUPPORTED

-      case JDCT_ISLOW:

-	fdct->do_dct[ci] = jpeg_fdct_islow;

-	method = JDCT_ISLOW;

-	break;

-#endif

-#ifdef DCT_IFAST_SUPPORTED

-      case JDCT_IFAST:

-	fdct->do_dct[ci] = jpeg_fdct_ifast;

-	method = JDCT_IFAST;

-	break;

-#endif

-#ifdef DCT_FLOAT_SUPPORTED

-      case JDCT_FLOAT:

-	fdct->do_float_dct[ci] = jpeg_fdct_float;

-	method = JDCT_FLOAT;

-	break;

-#endif

-      default:

-	ERREXIT(cinfo, JERR_NOT_COMPILED);

-	break;

-      }

-      break;

-    default:

-      ERREXIT2(cinfo, JERR_BAD_DCTSIZE,

-	       compptr->DCT_h_scaled_size, compptr->DCT_v_scaled_size);

-      break;

-    }

-    qtblno = compptr->quant_tbl_no;

-    /* Make sure specified quantization table is present */

-    if (qtblno < 0 || qtblno >= NUM_QUANT_TBLS ||

-	cinfo->quant_tbl_ptrs[qtblno] == NULL)

-      ERREXIT1(cinfo, JERR_NO_QUANT_TABLE, qtblno);

-    qtbl = cinfo->quant_tbl_ptrs[qtblno];

-    /* Compute divisors for this quant table */

-    /* We may do this more than once for same table, but it's not a big deal */

-    switch (method) {

-#ifdef PROVIDE_ISLOW_TABLES

-    case JDCT_ISLOW:

-      /* For LL&M IDCT method, divisors are equal to raw quantization

-       * coefficients multiplied by 8 (to counteract scaling).

-       */

-      if (fdct->divisors[qtblno] == NULL) {

-	fdct->divisors[qtblno] = (DCTELEM *)

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

-				      DCTSIZE2 * SIZEOF(DCTELEM));

-      }

-      dtbl = fdct->divisors[qtblno];

-      for (i = 0; i < DCTSIZE2; i++) {

-	dtbl[i] = ((DCTELEM) qtbl->quantval[i]) << 3;

-      }

-      fdct->pub.forward_DCT[ci] = forward_DCT;

-      break;

-#endif

-#ifdef DCT_IFAST_SUPPORTED

-    case JDCT_IFAST:

-      {

-	/* For AA&N IDCT method, divisors are equal to quantization

-	 * coefficients scaled by scalefactor[row]*scalefactor[col], where

-	 *   scalefactor[0] = 1

-	 *   scalefactor[k] = cos(k*PI/16) * sqrt(2)    for k=1..7

-	 * We apply a further scale factor of 8.

-	 */

-#define CONST_BITS 14

-	static const INT16 aanscales[DCTSIZE2] = {

-	  /* precomputed values scaled up by 14 bits */

-	  16384, 22725, 21407, 19266, 16384, 12873,  8867,  4520,

-	  22725, 31521, 29692, 26722, 22725, 17855, 12299,  6270,

-	  21407, 29692, 27969, 25172, 21407, 16819, 11585,  5906,

-	  19266, 26722, 25172, 22654, 19266, 15137, 10426,  5315,

-	  16384, 22725, 21407, 19266, 16384, 12873,  8867,  4520,

-	  12873, 17855, 16819, 15137, 12873, 10114,  6967,  3552,

-	   8867, 12299, 11585, 10426,  8867,  6967,  4799,  2446,

-	   4520,  6270,  5906,  5315,  4520,  3552,  2446,  1247

-	};

-	SHIFT_TEMPS

-

-	if (fdct->divisors[qtblno] == NULL) {

-	  fdct->divisors[qtblno] = (DCTELEM *)

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

-					DCTSIZE2 * SIZEOF(DCTELEM));

-	}

-	dtbl = fdct->divisors[qtblno];

-	for (i = 0; i < DCTSIZE2; i++) {

-	  dtbl[i] = (DCTELEM)

-	    DESCALE(MULTIPLY16V16((INT32) qtbl->quantval[i],

-				  (INT32) aanscales[i]),

-		    CONST_BITS-3);

-	}

-      }

-      fdct->pub.forward_DCT[ci] = forward_DCT;

-      break;

-#endif

-#ifdef DCT_FLOAT_SUPPORTED

-    case JDCT_FLOAT:

-      {

-	/* For float AA&N IDCT method, divisors are equal to quantization

-	 * coefficients scaled by scalefactor[row]*scalefactor[col], where

-	 *   scalefactor[0] = 1

-	 *   scalefactor[k] = cos(k*PI/16) * sqrt(2)    for k=1..7

-	 * We apply a further scale factor of 8.

-	 * What's actually stored is 1/divisor so that the inner loop can

-	 * use a multiplication rather than a division.

-	 */

-	FAST_FLOAT * fdtbl;

-	int row, col;

-	static const double aanscalefactor[DCTSIZE] = {

-	  1.0, 1.387039845, 1.306562965, 1.175875602,

-	  1.0, 0.785694958, 0.541196100, 0.275899379

-	};

-

-	if (fdct->float_divisors[qtblno] == NULL) {

-	  fdct->float_divisors[qtblno] = (FAST_FLOAT *)

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

-					DCTSIZE2 * SIZEOF(FAST_FLOAT));

-	}

-	fdtbl = fdct->float_divisors[qtblno];

-	i = 0;

-	for (row = 0; row < DCTSIZE; row++) {

-	  for (col = 0; col < DCTSIZE; col++) {

-	    fdtbl[i] = (FAST_FLOAT)

-	      (1.0 / (((double) qtbl->quantval[i] *

-		       aanscalefactor[row] * aanscalefactor[col] * 8.0)));

-	    i++;

-	  }

-	}

-      }

-      fdct->pub.forward_DCT[ci] = forward_DCT_float;

-      break;

-#endif

-    default:

-      ERREXIT(cinfo, JERR_NOT_COMPILED);

-      break;

-    }

-  }

-}

-

-

-/*

- * Initialize FDCT manager.

- */

-

-GLOBAL(void)

-jinit_forward_dct (j_compress_ptr cinfo)

-{

-  my_fdct_ptr fdct;

-  int i;

-

-  fdct = (my_fdct_ptr)

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

-				SIZEOF(my_fdct_controller));

-  cinfo->fdct = (struct jpeg_forward_dct *) fdct;

-  fdct->pub.start_pass = start_pass_fdctmgr;

-

-  /* Mark divisor tables unallocated */

-  for (i = 0; i < NUM_QUANT_TBLS; i++) {

-    fdct->divisors[i] = NULL;

-#ifdef DCT_FLOAT_SUPPORTED

-    fdct->float_divisors[i] = NULL;

-#endif

-  }

-}

+/*
+ * jcdctmgr.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 forward-DCT management logic.
+ * This code selects a particular DCT implementation to be used,
+ * and it performs related housekeeping chores including coefficient
+ * quantization.
+ */
+
+#define JPEG_INTERNALS
+#include "jinclude.h"
+#include "jpeglib.h"
+#include "jdct.h"		/* Private declarations for DCT subsystem */
+
+
+/* Private subobject for this module */
+
+typedef struct {
+  struct jpeg_forward_dct pub;	/* public fields */
+
+  /* Pointer to the DCT routine actually in use */
+  forward_DCT_method_ptr do_dct[MAX_COMPONENTS];
+
+  /* The actual post-DCT divisors --- not identical to the quant table
+   * entries, because of scaling (especially for an unnormalized DCT).
+   * Each table is given in normal array order.
+   */
+  DCTELEM * divisors[NUM_QUANT_TBLS];
+
+#ifdef DCT_FLOAT_SUPPORTED
+  /* Same as above for the floating-point case. */
+  float_DCT_method_ptr do_float_dct[MAX_COMPONENTS];
+  FAST_FLOAT * float_divisors[NUM_QUANT_TBLS];
+#endif
+} my_fdct_controller;
+
+typedef my_fdct_controller * my_fdct_ptr;
+
+
+/* The current scaled-DCT routines require ISLOW-style divisor tables,
+ * so be sure to compile that code if either ISLOW or SCALING is requested.
+ */
+#ifdef DCT_ISLOW_SUPPORTED
+#define PROVIDE_ISLOW_TABLES
+#else
+#ifdef DCT_SCALING_SUPPORTED
+#define PROVIDE_ISLOW_TABLES
+#endif
+#endif
+
+
+/*
+ * Perform forward DCT on one or more blocks of a component.
+ *
+ * The input samples are taken from the sample_data[] array starting at
+ * position start_row/start_col, and moving to the right for any additional
+ * blocks. The quantized coefficients are returned in coef_blocks[].
+ */
+
+METHODDEF(void)
+forward_DCT (j_compress_ptr cinfo, jpeg_component_info * compptr,
+	     JSAMPARRAY sample_data, JBLOCKROW coef_blocks,
+	     JDIMENSION start_row, JDIMENSION start_col,
+	     JDIMENSION num_blocks)
+/* This version is used for integer DCT implementations. */
+{
+  /* This routine is heavily used, so it's worth coding it tightly. */
+  my_fdct_ptr fdct = (my_fdct_ptr) cinfo->fdct;
+  forward_DCT_method_ptr do_dct = fdct->do_dct[compptr->component_index];
+  DCTELEM * divisors = fdct->divisors[compptr->quant_tbl_no];
+  DCTELEM workspace[DCTSIZE2];	/* work area for FDCT subroutine */
+  JDIMENSION bi;
+
+  sample_data += start_row;	/* fold in the vertical offset once */
+
+  for (bi = 0; bi < num_blocks; bi++, start_col += compptr->DCT_h_scaled_size) {
+    /* Perform the DCT */
+    (*do_dct) (workspace, sample_data, start_col);
+
+    /* Quantize/descale the coefficients, and store into coef_blocks[] */
+    { register DCTELEM temp, qval;
+      register int i;
+      register JCOEFPTR output_ptr = coef_blocks[bi];
+
+      for (i = 0; i < DCTSIZE2; i++) {
+	qval = divisors[i];
+	temp = workspace[i];
+	/* Divide the coefficient value by qval, ensuring proper rounding.
+	 * Since C does not specify the direction of rounding for negative
+	 * quotients, we have to force the dividend positive for portability.
+	 *
+	 * In most files, at least half of the output values will be zero
+	 * (at default quantization settings, more like three-quarters...)
+	 * so we should ensure that this case is fast.  On many machines,
+	 * a comparison is enough cheaper than a divide to make a special test
+	 * a win.  Since both inputs will be nonnegative, we need only test
+	 * for a < b to discover whether a/b is 0.
+	 * If your machine's division is fast enough, define FAST_DIVIDE.
+	 */
+#ifdef FAST_DIVIDE
+#define DIVIDE_BY(a,b)	a /= b
+#else
+#define DIVIDE_BY(a,b)	if (a >= b) a /= b; else a = 0
+#endif
+	if (temp < 0) {
+	  temp = -temp;
+	  temp += qval>>1;	/* for rounding */
+	  DIVIDE_BY(temp, qval);
+	  temp = -temp;
+	} else {
+	  temp += qval>>1;	/* for rounding */
+	  DIVIDE_BY(temp, qval);
+	}
+	output_ptr[i] = (JCOEF) temp;
+      }
+    }
+  }
+}
+
+
+#ifdef DCT_FLOAT_SUPPORTED
+
+METHODDEF(void)
+forward_DCT_float (j_compress_ptr cinfo, jpeg_component_info * compptr,
+		   JSAMPARRAY sample_data, JBLOCKROW coef_blocks,
+		   JDIMENSION start_row, JDIMENSION start_col,
+		   JDIMENSION num_blocks)
+/* This version is used for floating-point DCT implementations. */
+{
+  /* This routine is heavily used, so it's worth coding it tightly. */
+  my_fdct_ptr fdct = (my_fdct_ptr) cinfo->fdct;
+  float_DCT_method_ptr do_dct = fdct->do_float_dct[compptr->component_index];
+  FAST_FLOAT * divisors = fdct->float_divisors[compptr->quant_tbl_no];
+  FAST_FLOAT workspace[DCTSIZE2]; /* work area for FDCT subroutine */
+  JDIMENSION bi;
+
+  sample_data += start_row;	/* fold in the vertical offset once */
+
+  for (bi = 0; bi < num_blocks; bi++, start_col += compptr->DCT_h_scaled_size) {
+    /* Perform the DCT */
+    (*do_dct) (workspace, sample_data, start_col);
+
+    /* Quantize/descale the coefficients, and store into coef_blocks[] */
+    { register FAST_FLOAT temp;
+      register int i;
+      register JCOEFPTR output_ptr = coef_blocks[bi];
+
+      for (i = 0; i < DCTSIZE2; i++) {
+	/* Apply the quantization and scaling factor */
+	temp = workspace[i] * divisors[i];
+	/* Round to nearest integer.
+	 * Since C does not specify the direction of rounding for negative
+	 * quotients, we have to force the dividend positive for portability.
+	 * The maximum coefficient size is +-16K (for 12-bit data), so this
+	 * code should work for either 16-bit or 32-bit ints.
+	 */
+	output_ptr[i] = (JCOEF) ((int) (temp + (FAST_FLOAT) 16384.5) - 16384);
+      }
+    }
+  }
+}
+
+#endif /* DCT_FLOAT_SUPPORTED */
+
+
+/*
+ * Initialize for a processing pass.
+ * Verify that all referenced Q-tables are present, and set up
+ * the divisor table for each one.
+ * In the current implementation, DCT of all components is done during
+ * the first pass, even if only some components will be output in the
+ * first scan.  Hence all components should be examined here.
+ */
+
+METHODDEF(void)
+start_pass_fdctmgr (j_compress_ptr cinfo)
+{
+  my_fdct_ptr fdct = (my_fdct_ptr) cinfo->fdct;
+  int ci, qtblno, i;
+  jpeg_component_info *compptr;
+  int method = 0;
+  JQUANT_TBL * qtbl;
+  DCTELEM * dtbl;
+
+  for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
+       ci++, compptr++) {
+    /* Select the proper DCT routine for this component's scaling */
+    switch ((compptr->DCT_h_scaled_size << 8) + compptr->DCT_v_scaled_size) {
+#ifdef DCT_SCALING_SUPPORTED
+    case ((1 << 8) + 1):
+      fdct->do_dct[ci] = jpeg_fdct_1x1;
+      method = JDCT_ISLOW;	/* jfdctint uses islow-style table */
+      break;
+    case ((2 << 8) + 2):
+      fdct->do_dct[ci] = jpeg_fdct_2x2;
+      method = JDCT_ISLOW;	/* jfdctint uses islow-style table */
+      break;
+    case ((3 << 8) + 3):
+      fdct->do_dct[ci] = jpeg_fdct_3x3;
+      method = JDCT_ISLOW;	/* jfdctint uses islow-style table */
+      break;
+    case ((4 << 8) + 4):
+      fdct->do_dct[ci] = jpeg_fdct_4x4;
+      method = JDCT_ISLOW;	/* jfdctint uses islow-style table */
+      break;
+    case ((5 << 8) + 5):
+      fdct->do_dct[ci] = jpeg_fdct_5x5;
+      method = JDCT_ISLOW;	/* jfdctint uses islow-style table */
+      break;
+    case ((6 << 8) + 6):
+      fdct->do_dct[ci] = jpeg_fdct_6x6;
+      method = JDCT_ISLOW;	/* jfdctint uses islow-style table */
+      break;
+    case ((7 << 8) + 7):
+      fdct->do_dct[ci] = jpeg_fdct_7x7;
+      method = JDCT_ISLOW;	/* jfdctint uses islow-style table */
+      break;
+    case ((9 << 8) + 9):
+      fdct->do_dct[ci] = jpeg_fdct_9x9;
+      method = JDCT_ISLOW;	/* jfdctint uses islow-style table */
+      break;
+    case ((10 << 8) + 10):
+      fdct->do_dct[ci] = jpeg_fdct_10x10;
+      method = JDCT_ISLOW;	/* jfdctint uses islow-style table */
+      break;
+    case ((11 << 8) + 11):
+      fdct->do_dct[ci] = jpeg_fdct_11x11;
+      method = JDCT_ISLOW;	/* jfdctint uses islow-style table */
+      break;
+    case ((12 << 8) + 12):
+      fdct->do_dct[ci] = jpeg_fdct_12x12;
+      method = JDCT_ISLOW;	/* jfdctint uses islow-style table */
+      break;
+    case ((13 << 8) + 13):
+      fdct->do_dct[ci] = jpeg_fdct_13x13;
+      method = JDCT_ISLOW;	/* jfdctint uses islow-style table */
+      break;
+    case ((14 << 8) + 14):
+      fdct->do_dct[ci] = jpeg_fdct_14x14;
+      method = JDCT_ISLOW;	/* jfdctint uses islow-style table */
+      break;
+    case ((15 << 8) + 15):
+      fdct->do_dct[ci] = jpeg_fdct_15x15;
+      method = JDCT_ISLOW;	/* jfdctint uses islow-style table */
+      break;
+    case ((16 << 8) + 16):
+      fdct->do_dct[ci] = jpeg_fdct_16x16;
+      method = JDCT_ISLOW;	/* jfdctint uses islow-style table */
+      break;
+    case ((16 << 8) + 8):
+      fdct->do_dct[ci] = jpeg_fdct_16x8;
+      method = JDCT_ISLOW;	/* jfdctint uses islow-style table */
+      break;
+    case ((14 << 8) + 7):
+      fdct->do_dct[ci] = jpeg_fdct_14x7;
+      method = JDCT_ISLOW;	/* jfdctint uses islow-style table */
+      break;
+    case ((12 << 8) + 6):
+      fdct->do_dct[ci] = jpeg_fdct_12x6;
+      method = JDCT_ISLOW;	/* jfdctint uses islow-style table */
+      break;
+    case ((10 << 8) + 5):
+      fdct->do_dct[ci] = jpeg_fdct_10x5;
+      method = JDCT_ISLOW;	/* jfdctint uses islow-style table */
+      break;
+    case ((8 << 8) + 4):
+      fdct->do_dct[ci] = jpeg_fdct_8x4;
+      method = JDCT_ISLOW;	/* jfdctint uses islow-style table */
+      break;
+    case ((6 << 8) + 3):
+      fdct->do_dct[ci] = jpeg_fdct_6x3;
+      method = JDCT_ISLOW;	/* jfdctint uses islow-style table */
+      break;
+    case ((4 << 8) + 2):
+      fdct->do_dct[ci] = jpeg_fdct_4x2;
+      method = JDCT_ISLOW;	/* jfdctint uses islow-style table */
+      break;
+    case ((2 << 8) + 1):
+      fdct->do_dct[ci] = jpeg_fdct_2x1;
+      method = JDCT_ISLOW;	/* jfdctint uses islow-style table */
+      break;
+    case ((8 << 8) + 16):
+      fdct->do_dct[ci] = jpeg_fdct_8x16;
+      method = JDCT_ISLOW;	/* jfdctint uses islow-style table */
+      break;
+    case ((7 << 8) + 14):
+      fdct->do_dct[ci] = jpeg_fdct_7x14;
+      method = JDCT_ISLOW;	/* jfdctint uses islow-style table */
+      break;
+    case ((6 << 8) + 12):
+      fdct->do_dct[ci] = jpeg_fdct_6x12;
+      method = JDCT_ISLOW;	/* jfdctint uses islow-style table */
+      break;
+    case ((5 << 8) + 10):
+      fdct->do_dct[ci] = jpeg_fdct_5x10;
+      method = JDCT_ISLOW;	/* jfdctint uses islow-style table */
+      break;
+    case ((4 << 8) + 8):
+      fdct->do_dct[ci] = jpeg_fdct_4x8;
+      method = JDCT_ISLOW;	/* jfdctint uses islow-style table */
+      break;
+    case ((3 << 8) + 6):
+      fdct->do_dct[ci] = jpeg_fdct_3x6;
+      method = JDCT_ISLOW;	/* jfdctint uses islow-style table */
+      break;
+    case ((2 << 8) + 4):
+      fdct->do_dct[ci] = jpeg_fdct_2x4;
+      method = JDCT_ISLOW;	/* jfdctint uses islow-style table */
+      break;
+    case ((1 << 8) + 2):
+      fdct->do_dct[ci] = jpeg_fdct_1x2;
+      method = JDCT_ISLOW;	/* jfdctint uses islow-style table */
+      break;
+#endif
+    case ((DCTSIZE << 8) + DCTSIZE):
+      switch (cinfo->dct_method) {
+#ifdef DCT_ISLOW_SUPPORTED
+      case JDCT_ISLOW:
+	fdct->do_dct[ci] = jpeg_fdct_islow;
+	method = JDCT_ISLOW;
+	break;
+#endif
+#ifdef DCT_IFAST_SUPPORTED
+      case JDCT_IFAST:
+	fdct->do_dct[ci] = jpeg_fdct_ifast;
+	method = JDCT_IFAST;
+	break;
+#endif
+#ifdef DCT_FLOAT_SUPPORTED
+      case JDCT_FLOAT:
+	fdct->do_float_dct[ci] = jpeg_fdct_float;
+	method = JDCT_FLOAT;
+	break;
+#endif
+      default:
+	ERREXIT(cinfo, JERR_NOT_COMPILED);
+	break;
+      }
+      break;
+    default:
+      ERREXIT2(cinfo, JERR_BAD_DCTSIZE,
+	       compptr->DCT_h_scaled_size, compptr->DCT_v_scaled_size);
+      break;
+    }
+    qtblno = compptr->quant_tbl_no;
+    /* Make sure specified quantization table is present */
+    if (qtblno < 0 || qtblno >= NUM_QUANT_TBLS ||
+	cinfo->quant_tbl_ptrs[qtblno] == NULL)
+      ERREXIT1(cinfo, JERR_NO_QUANT_TABLE, qtblno);
+    qtbl = cinfo->quant_tbl_ptrs[qtblno];
+    /* Compute divisors for this quant table */
+    /* We may do this more than once for same table, but it's not a big deal */
+    switch (method) {
+#ifdef PROVIDE_ISLOW_TABLES
+    case JDCT_ISLOW:
+      /* For LL&M IDCT method, divisors are equal to raw quantization
+       * coefficients multiplied by 8 (to counteract scaling).
+       */
+      if (fdct->divisors[qtblno] == NULL) {
+	fdct->divisors[qtblno] = (DCTELEM *)
+	  (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
+				      DCTSIZE2 * SIZEOF(DCTELEM));
+      }
+      dtbl = fdct->divisors[qtblno];
+      for (i = 0; i < DCTSIZE2; i++) {
+	dtbl[i] = ((DCTELEM) qtbl->quantval[i]) << 3;
+      }
+      fdct->pub.forward_DCT[ci] = forward_DCT;
+      break;
+#endif
+#ifdef DCT_IFAST_SUPPORTED
+    case JDCT_IFAST:
+      {
+	/* For AA&N IDCT method, divisors are equal to quantization
+	 * coefficients scaled by scalefactor[row]*scalefactor[col], where
+	 *   scalefactor[0] = 1
+	 *   scalefactor[k] = cos(k*PI/16) * sqrt(2)    for k=1..7
+	 * We apply a further scale factor of 8.
+	 */
+#define CONST_BITS 14
+	static const INT16 aanscales[DCTSIZE2] = {
+	  /* precomputed values scaled up by 14 bits */
+	  16384, 22725, 21407, 19266, 16384, 12873,  8867,  4520,
+	  22725, 31521, 29692, 26722, 22725, 17855, 12299,  6270,
+	  21407, 29692, 27969, 25172, 21407, 16819, 11585,  5906,
+	  19266, 26722, 25172, 22654, 19266, 15137, 10426,  5315,
+	  16384, 22725, 21407, 19266, 16384, 12873,  8867,  4520,
+	  12873, 17855, 16819, 15137, 12873, 10114,  6967,  3552,
+	   8867, 12299, 11585, 10426,  8867,  6967,  4799,  2446,
+	   4520,  6270,  5906,  5315,  4520,  3552,  2446,  1247
+	};
+	SHIFT_TEMPS
+
+	if (fdct->divisors[qtblno] == NULL) {
+	  fdct->divisors[qtblno] = (DCTELEM *)
+	    (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
+					DCTSIZE2 * SIZEOF(DCTELEM));
+	}
+	dtbl = fdct->divisors[qtblno];
+	for (i = 0; i < DCTSIZE2; i++) {
+	  dtbl[i] = (DCTELEM)
+	    DESCALE(MULTIPLY16V16((INT32) qtbl->quantval[i],
+				  (INT32) aanscales[i]),
+		    CONST_BITS-3);
+	}
+      }
+      fdct->pub.forward_DCT[ci] = forward_DCT;
+      break;
+#endif
+#ifdef DCT_FLOAT_SUPPORTED
+    case JDCT_FLOAT:
+      {
+	/* For float AA&N IDCT method, divisors are equal to quantization
+	 * coefficients scaled by scalefactor[row]*scalefactor[col], where
+	 *   scalefactor[0] = 1
+	 *   scalefactor[k] = cos(k*PI/16) * sqrt(2)    for k=1..7
+	 * We apply a further scale factor of 8.
+	 * What's actually stored is 1/divisor so that the inner loop can
+	 * use a multiplication rather than a division.
+	 */
+	FAST_FLOAT * fdtbl;
+	int row, col;
+	static const double aanscalefactor[DCTSIZE] = {
+	  1.0, 1.387039845, 1.306562965, 1.175875602,
+	  1.0, 0.785694958, 0.541196100, 0.275899379
+	};
+
+	if (fdct->float_divisors[qtblno] == NULL) {
+	  fdct->float_divisors[qtblno] = (FAST_FLOAT *)
+	    (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
+					DCTSIZE2 * SIZEOF(FAST_FLOAT));
+	}
+	fdtbl = fdct->float_divisors[qtblno];
+	i = 0;
+	for (row = 0; row < DCTSIZE; row++) {
+	  for (col = 0; col < DCTSIZE; col++) {
+	    fdtbl[i] = (FAST_FLOAT)
+	      (1.0 / (((double) qtbl->quantval[i] *
+		       aanscalefactor[row] * aanscalefactor[col] * 8.0)));
+	    i++;
+	  }
+	}
+      }
+      fdct->pub.forward_DCT[ci] = forward_DCT_float;
+      break;
+#endif
+    default:
+      ERREXIT(cinfo, JERR_NOT_COMPILED);
+      break;
+    }
+  }
+}
+
+
+/*
+ * Initialize FDCT manager.
+ */
+
+GLOBAL(void)
+jinit_forward_dct (j_compress_ptr cinfo)
+{
+  my_fdct_ptr fdct;
+  int i;
+
+  fdct = (my_fdct_ptr)
+    (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
+				SIZEOF(my_fdct_controller));
+  cinfo->fdct = (struct jpeg_forward_dct *) fdct;
+  fdct->pub.start_pass = start_pass_fdctmgr;
+
+  /* Mark divisor tables unallocated */
+  for (i = 0; i < NUM_QUANT_TBLS; i++) {
+    fdct->divisors[i] = NULL;
+#ifdef DCT_FLOAT_SUPPORTED
+    fdct->float_divisors[i] = NULL;
+#endif
+  }
+}