update for zlib & FreeImage

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

1 files changed, 393 insertions, 393 deletions

diff --git a/plugins/FreeImage/Source/LibJPEG/jdct.h b/plugins/FreeImage/Source/LibJPEG/jdct.h
index b1ff91250b..360dec80c9 100644
--- a/plugins/FreeImage/Source/LibJPEG/jdct.h
+++ b/plugins/FreeImage/Source/LibJPEG/jdct.h
@@ -1,393 +1,393 @@
-/*

- * jdct.h

- *

- * 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 include file contains common declarations for the forward and

- * inverse DCT modules.  These declarations are private to the DCT managers

- * (jcdctmgr.c, jddctmgr.c) and the individual DCT algorithms.

- * The individual DCT algorithms are kept in separate files to ease 

- * machine-dependent tuning (e.g., assembly coding).

- */

-

-

-/*

- * A forward DCT routine is given a pointer to an input sample array and

- * a pointer to a work area of type DCTELEM[]; the DCT is to be performed

- * in-place in that buffer.  Type DCTELEM is int for 8-bit samples, INT32

- * for 12-bit samples.  (NOTE: Floating-point DCT implementations use an

- * array of type FAST_FLOAT, instead.)

- * The input data is to be fetched from the sample array starting at a

- * specified column.  (Any row offset needed will be applied to the array

- * pointer before it is passed to the FDCT code.)

- * Note that the number of samples fetched by the FDCT routine is

- * DCT_h_scaled_size * DCT_v_scaled_size.

- * The DCT outputs are returned scaled up by a factor of 8; they therefore

- * have a range of +-8K for 8-bit data, +-128K for 12-bit data.  This

- * convention improves accuracy in integer implementations and saves some

- * work in floating-point ones.

- * Quantization of the output coefficients is done by jcdctmgr.c.

- */

-

-#if BITS_IN_JSAMPLE == 8

-typedef int DCTELEM;		/* 16 or 32 bits is fine */

-#else

-typedef INT32 DCTELEM;		/* must have 32 bits */

-#endif

-

-typedef JMETHOD(void, forward_DCT_method_ptr, (DCTELEM * data,

-					       JSAMPARRAY sample_data,

-					       JDIMENSION start_col));

-typedef JMETHOD(void, float_DCT_method_ptr, (FAST_FLOAT * data,

-					     JSAMPARRAY sample_data,

-					     JDIMENSION start_col));

-

-

-/*

- * An inverse DCT routine is given a pointer to the input JBLOCK and a pointer

- * to an output sample array.  The routine must dequantize the input data as

- * well as perform the IDCT; for dequantization, it uses the multiplier table

- * pointed to by compptr->dct_table.  The output data is to be placed into the

- * sample array starting at a specified column.  (Any row offset needed will

- * be applied to the array pointer before it is passed to the IDCT code.)

- * Note that the number of samples emitted by the IDCT routine is

- * DCT_h_scaled_size * DCT_v_scaled_size.

- */

-

-/* typedef inverse_DCT_method_ptr is declared in jpegint.h */

-

-/*

- * Each IDCT routine has its own ideas about the best dct_table element type.

- */

-

-typedef MULTIPLIER ISLOW_MULT_TYPE; /* short or int, whichever is faster */

-#if BITS_IN_JSAMPLE == 8

-typedef MULTIPLIER IFAST_MULT_TYPE; /* 16 bits is OK, use short if faster */

-#define IFAST_SCALE_BITS  2	/* fractional bits in scale factors */

-#else

-typedef INT32 IFAST_MULT_TYPE;	/* need 32 bits for scaled quantizers */

-#define IFAST_SCALE_BITS  13	/* fractional bits in scale factors */

-#endif

-typedef FAST_FLOAT FLOAT_MULT_TYPE; /* preferred floating type */

-

-

-/*

- * Each IDCT routine is responsible for range-limiting its results and

- * converting them to unsigned form (0..MAXJSAMPLE).  The raw outputs could

- * be quite far out of range if the input data is corrupt, so a bulletproof

- * range-limiting step is required.  We use a mask-and-table-lookup method

- * to do the combined operations quickly.  See the comments with

- * prepare_range_limit_table (in jdmaster.c) for more info.

- */

-

-#define IDCT_range_limit(cinfo)  ((cinfo)->sample_range_limit + CENTERJSAMPLE)

-

-#define RANGE_MASK  (MAXJSAMPLE * 4 + 3) /* 2 bits wider than legal samples */

-

-

-/* Short forms of external names for systems with brain-damaged linkers. */

-

-#ifdef NEED_SHORT_EXTERNAL_NAMES

-#define jpeg_fdct_islow		jFDislow

-#define jpeg_fdct_ifast		jFDifast

-#define jpeg_fdct_float		jFDfloat

-#define jpeg_fdct_7x7		jFD7x7

-#define jpeg_fdct_6x6		jFD6x6

-#define jpeg_fdct_5x5		jFD5x5

-#define jpeg_fdct_4x4		jFD4x4

-#define jpeg_fdct_3x3		jFD3x3

-#define jpeg_fdct_2x2		jFD2x2

-#define jpeg_fdct_1x1		jFD1x1

-#define jpeg_fdct_9x9		jFD9x9

-#define jpeg_fdct_10x10		jFD10x10

-#define jpeg_fdct_11x11		jFD11x11

-#define jpeg_fdct_12x12		jFD12x12

-#define jpeg_fdct_13x13		jFD13x13

-#define jpeg_fdct_14x14		jFD14x14

-#define jpeg_fdct_15x15		jFD15x15

-#define jpeg_fdct_16x16		jFD16x16

-#define jpeg_fdct_16x8		jFD16x8

-#define jpeg_fdct_14x7		jFD14x7

-#define jpeg_fdct_12x6		jFD12x6

-#define jpeg_fdct_10x5		jFD10x5

-#define jpeg_fdct_8x4		jFD8x4

-#define jpeg_fdct_6x3		jFD6x3

-#define jpeg_fdct_4x2		jFD4x2

-#define jpeg_fdct_2x1		jFD2x1

-#define jpeg_fdct_8x16		jFD8x16

-#define jpeg_fdct_7x14		jFD7x14

-#define jpeg_fdct_6x12		jFD6x12

-#define jpeg_fdct_5x10		jFD5x10

-#define jpeg_fdct_4x8		jFD4x8

-#define jpeg_fdct_3x6		jFD3x6

-#define jpeg_fdct_2x4		jFD2x4

-#define jpeg_fdct_1x2		jFD1x2

-#define jpeg_idct_islow		jRDislow

-#define jpeg_idct_ifast		jRDifast

-#define jpeg_idct_float		jRDfloat

-#define jpeg_idct_7x7		jRD7x7

-#define jpeg_idct_6x6		jRD6x6

-#define jpeg_idct_5x5		jRD5x5

-#define jpeg_idct_4x4		jRD4x4

-#define jpeg_idct_3x3		jRD3x3

-#define jpeg_idct_2x2		jRD2x2

-#define jpeg_idct_1x1		jRD1x1

-#define jpeg_idct_9x9		jRD9x9

-#define jpeg_idct_10x10		jRD10x10

-#define jpeg_idct_11x11		jRD11x11

-#define jpeg_idct_12x12		jRD12x12

-#define jpeg_idct_13x13		jRD13x13

-#define jpeg_idct_14x14		jRD14x14

-#define jpeg_idct_15x15		jRD15x15

-#define jpeg_idct_16x16		jRD16x16

-#define jpeg_idct_16x8		jRD16x8

-#define jpeg_idct_14x7		jRD14x7

-#define jpeg_idct_12x6		jRD12x6

-#define jpeg_idct_10x5		jRD10x5

-#define jpeg_idct_8x4		jRD8x4

-#define jpeg_idct_6x3		jRD6x3

-#define jpeg_idct_4x2		jRD4x2

-#define jpeg_idct_2x1		jRD2x1

-#define jpeg_idct_8x16		jRD8x16

-#define jpeg_idct_7x14		jRD7x14

-#define jpeg_idct_6x12		jRD6x12

-#define jpeg_idct_5x10		jRD5x10

-#define jpeg_idct_4x8		jRD4x8

-#define jpeg_idct_3x6		jRD3x8

-#define jpeg_idct_2x4		jRD2x4

-#define jpeg_idct_1x2		jRD1x2

-#endif /* NEED_SHORT_EXTERNAL_NAMES */

-

-/* Extern declarations for the forward and inverse DCT routines. */

-

-EXTERN(void) jpeg_fdct_islow

-    JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));

-EXTERN(void) jpeg_fdct_ifast

-    JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));

-EXTERN(void) jpeg_fdct_float

-    JPP((FAST_FLOAT * data, JSAMPARRAY sample_data, JDIMENSION start_col));

-EXTERN(void) jpeg_fdct_7x7

-    JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));

-EXTERN(void) jpeg_fdct_6x6

-    JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));

-EXTERN(void) jpeg_fdct_5x5

-    JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));

-EXTERN(void) jpeg_fdct_4x4

-    JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));

-EXTERN(void) jpeg_fdct_3x3

-    JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));

-EXTERN(void) jpeg_fdct_2x2

-    JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));

-EXTERN(void) jpeg_fdct_1x1

-    JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));

-EXTERN(void) jpeg_fdct_9x9

-    JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));

-EXTERN(void) jpeg_fdct_10x10

-    JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));

-EXTERN(void) jpeg_fdct_11x11

-    JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));

-EXTERN(void) jpeg_fdct_12x12

-    JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));

-EXTERN(void) jpeg_fdct_13x13

-    JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));

-EXTERN(void) jpeg_fdct_14x14

-    JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));

-EXTERN(void) jpeg_fdct_15x15

-    JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));

-EXTERN(void) jpeg_fdct_16x16

-    JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));

-EXTERN(void) jpeg_fdct_16x8

-    JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));

-EXTERN(void) jpeg_fdct_14x7

-    JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));

-EXTERN(void) jpeg_fdct_12x6

-    JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));

-EXTERN(void) jpeg_fdct_10x5

-    JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));

-EXTERN(void) jpeg_fdct_8x4

-    JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));

-EXTERN(void) jpeg_fdct_6x3

-    JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));

-EXTERN(void) jpeg_fdct_4x2

-    JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));

-EXTERN(void) jpeg_fdct_2x1

-    JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));

-EXTERN(void) jpeg_fdct_8x16

-    JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));

-EXTERN(void) jpeg_fdct_7x14

-    JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));

-EXTERN(void) jpeg_fdct_6x12

-    JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));

-EXTERN(void) jpeg_fdct_5x10

-    JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));

-EXTERN(void) jpeg_fdct_4x8

-    JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));

-EXTERN(void) jpeg_fdct_3x6

-    JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));

-EXTERN(void) jpeg_fdct_2x4

-    JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));

-EXTERN(void) jpeg_fdct_1x2

-    JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));

-

-EXTERN(void) jpeg_idct_islow

-    JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,

-	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));

-EXTERN(void) jpeg_idct_ifast

-    JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,

-	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));

-EXTERN(void) jpeg_idct_float

-    JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,

-	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));

-EXTERN(void) jpeg_idct_7x7

-    JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,

-	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));

-EXTERN(void) jpeg_idct_6x6

-    JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,

-	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));

-EXTERN(void) jpeg_idct_5x5

-    JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,

-	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));

-EXTERN(void) jpeg_idct_4x4

-    JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,

-	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));

-EXTERN(void) jpeg_idct_3x3

-    JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,

-	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));

-EXTERN(void) jpeg_idct_2x2

-    JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,

-	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));

-EXTERN(void) jpeg_idct_1x1

-    JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,

-	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));

-EXTERN(void) jpeg_idct_9x9

-    JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,

-	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));

-EXTERN(void) jpeg_idct_10x10

-    JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,

-	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));

-EXTERN(void) jpeg_idct_11x11

-    JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,

-	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));

-EXTERN(void) jpeg_idct_12x12

-    JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,

-	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));

-EXTERN(void) jpeg_idct_13x13

-    JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,

-	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));

-EXTERN(void) jpeg_idct_14x14

-    JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,

-	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));

-EXTERN(void) jpeg_idct_15x15

-    JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,

-	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));

-EXTERN(void) jpeg_idct_16x16

-    JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,

-	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));

-EXTERN(void) jpeg_idct_16x8

-    JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,

-	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));

-EXTERN(void) jpeg_idct_14x7

-    JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,

-	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));

-EXTERN(void) jpeg_idct_12x6

-    JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,

-	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));

-EXTERN(void) jpeg_idct_10x5

-    JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,

-	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));

-EXTERN(void) jpeg_idct_8x4

-    JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,

-	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));

-EXTERN(void) jpeg_idct_6x3

-    JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,

-	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));

-EXTERN(void) jpeg_idct_4x2

-    JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,

-	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));

-EXTERN(void) jpeg_idct_2x1

-    JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,

-	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));

-EXTERN(void) jpeg_idct_8x16

-    JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,

-	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));

-EXTERN(void) jpeg_idct_7x14

-    JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,

-	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));

-EXTERN(void) jpeg_idct_6x12

-    JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,

-	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));

-EXTERN(void) jpeg_idct_5x10

-    JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,

-	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));

-EXTERN(void) jpeg_idct_4x8

-    JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,

-	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));

-EXTERN(void) jpeg_idct_3x6

-    JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,

-	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));

-EXTERN(void) jpeg_idct_2x4

-    JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,

-	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));

-EXTERN(void) jpeg_idct_1x2

-    JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,

-	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));

-

-

-/*

- * Macros for handling fixed-point arithmetic; these are used by many

- * but not all of the DCT/IDCT modules.

- *

- * All values are expected to be of type INT32.

- * Fractional constants are scaled left by CONST_BITS bits.

- * CONST_BITS is defined within each module using these macros,

- * and may differ from one module to the next.

- */

-

-#define ONE	((INT32) 1)

-#define CONST_SCALE (ONE << CONST_BITS)

-

-/* Convert a positive real constant to an integer scaled by CONST_SCALE.

- * Caution: some C compilers fail to reduce "FIX(constant)" at compile time,

- * thus causing a lot of useless floating-point operations at run time.

- */

-

-#define FIX(x)	((INT32) ((x) * CONST_SCALE + 0.5))

-

-/* Descale and correctly round an INT32 value that's scaled by N bits.

- * We assume RIGHT_SHIFT rounds towards minus infinity, so adding

- * the fudge factor is correct for either sign of X.

- */

-

-#define DESCALE(x,n)  RIGHT_SHIFT((x) + (ONE << ((n)-1)), n)

-

-/* Multiply an INT32 variable by an INT32 constant to yield an INT32 result.

- * This macro is used only when the two inputs will actually be no more than

- * 16 bits wide, so that a 16x16->32 bit multiply can be used instead of a

- * full 32x32 multiply.  This provides a useful speedup on many machines.

- * Unfortunately there is no way to specify a 16x16->32 multiply portably

- * in C, but some C compilers will do the right thing if you provide the

- * correct combination of casts.

- */

-

-#ifdef SHORTxSHORT_32		/* may work if 'int' is 32 bits */

-#define MULTIPLY16C16(var,const)  (((INT16) (var)) * ((INT16) (const)))

-#endif

-#ifdef SHORTxLCONST_32		/* known to work with Microsoft C 6.0 */

-#define MULTIPLY16C16(var,const)  (((INT16) (var)) * ((INT32) (const)))

-#endif

-

-#ifndef MULTIPLY16C16		/* default definition */

-#define MULTIPLY16C16(var,const)  ((var) * (const))

-#endif

-

-/* Same except both inputs are variables. */

-

-#ifdef SHORTxSHORT_32		/* may work if 'int' is 32 bits */

-#define MULTIPLY16V16(var1,var2)  (((INT16) (var1)) * ((INT16) (var2)))

-#endif

-

-#ifndef MULTIPLY16V16		/* default definition */

-#define MULTIPLY16V16(var1,var2)  ((var1) * (var2))

-#endif

+/*
+ * jdct.h
+ *
+ * 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 include file contains common declarations for the forward and
+ * inverse DCT modules.  These declarations are private to the DCT managers
+ * (jcdctmgr.c, jddctmgr.c) and the individual DCT algorithms.
+ * The individual DCT algorithms are kept in separate files to ease 
+ * machine-dependent tuning (e.g., assembly coding).
+ */
+
+
+/*
+ * A forward DCT routine is given a pointer to an input sample array and
+ * a pointer to a work area of type DCTELEM[]; the DCT is to be performed
+ * in-place in that buffer.  Type DCTELEM is int for 8-bit samples, INT32
+ * for 12-bit samples.  (NOTE: Floating-point DCT implementations use an
+ * array of type FAST_FLOAT, instead.)
+ * The input data is to be fetched from the sample array starting at a
+ * specified column.  (Any row offset needed will be applied to the array
+ * pointer before it is passed to the FDCT code.)
+ * Note that the number of samples fetched by the FDCT routine is
+ * DCT_h_scaled_size * DCT_v_scaled_size.
+ * The DCT outputs are returned scaled up by a factor of 8; they therefore
+ * have a range of +-8K for 8-bit data, +-128K for 12-bit data.  This
+ * convention improves accuracy in integer implementations and saves some
+ * work in floating-point ones.
+ * Quantization of the output coefficients is done by jcdctmgr.c.
+ */
+
+#if BITS_IN_JSAMPLE == 8
+typedef int DCTELEM;		/* 16 or 32 bits is fine */
+#else
+typedef INT32 DCTELEM;		/* must have 32 bits */
+#endif
+
+typedef JMETHOD(void, forward_DCT_method_ptr, (DCTELEM * data,
+					       JSAMPARRAY sample_data,
+					       JDIMENSION start_col));
+typedef JMETHOD(void, float_DCT_method_ptr, (FAST_FLOAT * data,
+					     JSAMPARRAY sample_data,
+					     JDIMENSION start_col));
+
+
+/*
+ * An inverse DCT routine is given a pointer to the input JBLOCK and a pointer
+ * to an output sample array.  The routine must dequantize the input data as
+ * well as perform the IDCT; for dequantization, it uses the multiplier table
+ * pointed to by compptr->dct_table.  The output data is to be placed into the
+ * sample array starting at a specified column.  (Any row offset needed will
+ * be applied to the array pointer before it is passed to the IDCT code.)
+ * Note that the number of samples emitted by the IDCT routine is
+ * DCT_h_scaled_size * DCT_v_scaled_size.
+ */
+
+/* typedef inverse_DCT_method_ptr is declared in jpegint.h */
+
+/*
+ * Each IDCT routine has its own ideas about the best dct_table element type.
+ */
+
+typedef MULTIPLIER ISLOW_MULT_TYPE; /* short or int, whichever is faster */
+#if BITS_IN_JSAMPLE == 8
+typedef MULTIPLIER IFAST_MULT_TYPE; /* 16 bits is OK, use short if faster */
+#define IFAST_SCALE_BITS  2	/* fractional bits in scale factors */
+#else
+typedef INT32 IFAST_MULT_TYPE;	/* need 32 bits for scaled quantizers */
+#define IFAST_SCALE_BITS  13	/* fractional bits in scale factors */
+#endif
+typedef FAST_FLOAT FLOAT_MULT_TYPE; /* preferred floating type */
+
+
+/*
+ * Each IDCT routine is responsible for range-limiting its results and
+ * converting them to unsigned form (0..MAXJSAMPLE).  The raw outputs could
+ * be quite far out of range if the input data is corrupt, so a bulletproof
+ * range-limiting step is required.  We use a mask-and-table-lookup method
+ * to do the combined operations quickly.  See the comments with
+ * prepare_range_limit_table (in jdmaster.c) for more info.
+ */
+
+#define IDCT_range_limit(cinfo)  ((cinfo)->sample_range_limit + CENTERJSAMPLE)
+
+#define RANGE_MASK  (MAXJSAMPLE * 4 + 3) /* 2 bits wider than legal samples */
+
+
+/* Short forms of external names for systems with brain-damaged linkers. */
+
+#ifdef NEED_SHORT_EXTERNAL_NAMES
+#define jpeg_fdct_islow		jFDislow
+#define jpeg_fdct_ifast		jFDifast
+#define jpeg_fdct_float		jFDfloat
+#define jpeg_fdct_7x7		jFD7x7
+#define jpeg_fdct_6x6		jFD6x6
+#define jpeg_fdct_5x5		jFD5x5
+#define jpeg_fdct_4x4		jFD4x4
+#define jpeg_fdct_3x3		jFD3x3
+#define jpeg_fdct_2x2		jFD2x2
+#define jpeg_fdct_1x1		jFD1x1
+#define jpeg_fdct_9x9		jFD9x9
+#define jpeg_fdct_10x10		jFD10x10
+#define jpeg_fdct_11x11		jFD11x11
+#define jpeg_fdct_12x12		jFD12x12
+#define jpeg_fdct_13x13		jFD13x13
+#define jpeg_fdct_14x14		jFD14x14
+#define jpeg_fdct_15x15		jFD15x15
+#define jpeg_fdct_16x16		jFD16x16
+#define jpeg_fdct_16x8		jFD16x8
+#define jpeg_fdct_14x7		jFD14x7
+#define jpeg_fdct_12x6		jFD12x6
+#define jpeg_fdct_10x5		jFD10x5
+#define jpeg_fdct_8x4		jFD8x4
+#define jpeg_fdct_6x3		jFD6x3
+#define jpeg_fdct_4x2		jFD4x2
+#define jpeg_fdct_2x1		jFD2x1
+#define jpeg_fdct_8x16		jFD8x16
+#define jpeg_fdct_7x14		jFD7x14
+#define jpeg_fdct_6x12		jFD6x12
+#define jpeg_fdct_5x10		jFD5x10
+#define jpeg_fdct_4x8		jFD4x8
+#define jpeg_fdct_3x6		jFD3x6
+#define jpeg_fdct_2x4		jFD2x4
+#define jpeg_fdct_1x2		jFD1x2
+#define jpeg_idct_islow		jRDislow
+#define jpeg_idct_ifast		jRDifast
+#define jpeg_idct_float		jRDfloat
+#define jpeg_idct_7x7		jRD7x7
+#define jpeg_idct_6x6		jRD6x6
+#define jpeg_idct_5x5		jRD5x5
+#define jpeg_idct_4x4		jRD4x4
+#define jpeg_idct_3x3		jRD3x3
+#define jpeg_idct_2x2		jRD2x2
+#define jpeg_idct_1x1		jRD1x1
+#define jpeg_idct_9x9		jRD9x9
+#define jpeg_idct_10x10		jRD10x10
+#define jpeg_idct_11x11		jRD11x11
+#define jpeg_idct_12x12		jRD12x12
+#define jpeg_idct_13x13		jRD13x13
+#define jpeg_idct_14x14		jRD14x14
+#define jpeg_idct_15x15		jRD15x15
+#define jpeg_idct_16x16		jRD16x16
+#define jpeg_idct_16x8		jRD16x8
+#define jpeg_idct_14x7		jRD14x7
+#define jpeg_idct_12x6		jRD12x6
+#define jpeg_idct_10x5		jRD10x5
+#define jpeg_idct_8x4		jRD8x4
+#define jpeg_idct_6x3		jRD6x3
+#define jpeg_idct_4x2		jRD4x2
+#define jpeg_idct_2x1		jRD2x1
+#define jpeg_idct_8x16		jRD8x16
+#define jpeg_idct_7x14		jRD7x14
+#define jpeg_idct_6x12		jRD6x12
+#define jpeg_idct_5x10		jRD5x10
+#define jpeg_idct_4x8		jRD4x8
+#define jpeg_idct_3x6		jRD3x8
+#define jpeg_idct_2x4		jRD2x4
+#define jpeg_idct_1x2		jRD1x2
+#endif /* NEED_SHORT_EXTERNAL_NAMES */
+
+/* Extern declarations for the forward and inverse DCT routines. */
+
+EXTERN(void) jpeg_fdct_islow
+    JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
+EXTERN(void) jpeg_fdct_ifast
+    JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
+EXTERN(void) jpeg_fdct_float
+    JPP((FAST_FLOAT * data, JSAMPARRAY sample_data, JDIMENSION start_col));
+EXTERN(void) jpeg_fdct_7x7
+    JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
+EXTERN(void) jpeg_fdct_6x6
+    JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
+EXTERN(void) jpeg_fdct_5x5
+    JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
+EXTERN(void) jpeg_fdct_4x4
+    JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
+EXTERN(void) jpeg_fdct_3x3
+    JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
+EXTERN(void) jpeg_fdct_2x2
+    JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
+EXTERN(void) jpeg_fdct_1x1
+    JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
+EXTERN(void) jpeg_fdct_9x9
+    JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
+EXTERN(void) jpeg_fdct_10x10
+    JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
+EXTERN(void) jpeg_fdct_11x11
+    JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
+EXTERN(void) jpeg_fdct_12x12
+    JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
+EXTERN(void) jpeg_fdct_13x13
+    JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
+EXTERN(void) jpeg_fdct_14x14
+    JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
+EXTERN(void) jpeg_fdct_15x15
+    JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
+EXTERN(void) jpeg_fdct_16x16
+    JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
+EXTERN(void) jpeg_fdct_16x8
+    JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
+EXTERN(void) jpeg_fdct_14x7
+    JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
+EXTERN(void) jpeg_fdct_12x6
+    JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
+EXTERN(void) jpeg_fdct_10x5
+    JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
+EXTERN(void) jpeg_fdct_8x4
+    JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
+EXTERN(void) jpeg_fdct_6x3
+    JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
+EXTERN(void) jpeg_fdct_4x2
+    JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
+EXTERN(void) jpeg_fdct_2x1
+    JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
+EXTERN(void) jpeg_fdct_8x16
+    JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
+EXTERN(void) jpeg_fdct_7x14
+    JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
+EXTERN(void) jpeg_fdct_6x12
+    JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
+EXTERN(void) jpeg_fdct_5x10
+    JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
+EXTERN(void) jpeg_fdct_4x8
+    JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
+EXTERN(void) jpeg_fdct_3x6
+    JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
+EXTERN(void) jpeg_fdct_2x4
+    JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
+EXTERN(void) jpeg_fdct_1x2
+    JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
+
+EXTERN(void) jpeg_idct_islow
+    JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
+	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
+EXTERN(void) jpeg_idct_ifast
+    JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
+	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
+EXTERN(void) jpeg_idct_float
+    JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
+	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
+EXTERN(void) jpeg_idct_7x7
+    JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
+	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
+EXTERN(void) jpeg_idct_6x6
+    JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
+	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
+EXTERN(void) jpeg_idct_5x5
+    JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
+	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
+EXTERN(void) jpeg_idct_4x4
+    JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
+	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
+EXTERN(void) jpeg_idct_3x3
+    JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
+	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
+EXTERN(void) jpeg_idct_2x2
+    JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
+	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
+EXTERN(void) jpeg_idct_1x1
+    JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
+	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
+EXTERN(void) jpeg_idct_9x9
+    JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
+	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
+EXTERN(void) jpeg_idct_10x10
+    JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
+	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
+EXTERN(void) jpeg_idct_11x11
+    JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
+	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
+EXTERN(void) jpeg_idct_12x12
+    JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
+	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
+EXTERN(void) jpeg_idct_13x13
+    JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
+	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
+EXTERN(void) jpeg_idct_14x14
+    JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
+	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
+EXTERN(void) jpeg_idct_15x15
+    JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
+	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
+EXTERN(void) jpeg_idct_16x16
+    JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
+	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
+EXTERN(void) jpeg_idct_16x8
+    JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
+	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
+EXTERN(void) jpeg_idct_14x7
+    JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
+	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
+EXTERN(void) jpeg_idct_12x6
+    JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
+	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
+EXTERN(void) jpeg_idct_10x5
+    JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
+	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
+EXTERN(void) jpeg_idct_8x4
+    JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
+	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
+EXTERN(void) jpeg_idct_6x3
+    JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
+	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
+EXTERN(void) jpeg_idct_4x2
+    JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
+	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
+EXTERN(void) jpeg_idct_2x1
+    JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
+	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
+EXTERN(void) jpeg_idct_8x16
+    JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
+	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
+EXTERN(void) jpeg_idct_7x14
+    JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
+	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
+EXTERN(void) jpeg_idct_6x12
+    JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
+	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
+EXTERN(void) jpeg_idct_5x10
+    JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
+	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
+EXTERN(void) jpeg_idct_4x8
+    JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
+	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
+EXTERN(void) jpeg_idct_3x6
+    JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
+	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
+EXTERN(void) jpeg_idct_2x4
+    JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
+	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
+EXTERN(void) jpeg_idct_1x2
+    JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
+	 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
+
+
+/*
+ * Macros for handling fixed-point arithmetic; these are used by many
+ * but not all of the DCT/IDCT modules.
+ *
+ * All values are expected to be of type INT32.
+ * Fractional constants are scaled left by CONST_BITS bits.
+ * CONST_BITS is defined within each module using these macros,
+ * and may differ from one module to the next.
+ */
+
+#define ONE	((INT32) 1)
+#define CONST_SCALE (ONE << CONST_BITS)
+
+/* Convert a positive real constant to an integer scaled by CONST_SCALE.
+ * Caution: some C compilers fail to reduce "FIX(constant)" at compile time,
+ * thus causing a lot of useless floating-point operations at run time.
+ */
+
+#define FIX(x)	((INT32) ((x) * CONST_SCALE + 0.5))
+
+/* Descale and correctly round an INT32 value that's scaled by N bits.
+ * We assume RIGHT_SHIFT rounds towards minus infinity, so adding
+ * the fudge factor is correct for either sign of X.
+ */
+
+#define DESCALE(x,n)  RIGHT_SHIFT((x) + (ONE << ((n)-1)), n)
+
+/* Multiply an INT32 variable by an INT32 constant to yield an INT32 result.
+ * This macro is used only when the two inputs will actually be no more than
+ * 16 bits wide, so that a 16x16->32 bit multiply can be used instead of a
+ * full 32x32 multiply.  This provides a useful speedup on many machines.
+ * Unfortunately there is no way to specify a 16x16->32 multiply portably
+ * in C, but some C compilers will do the right thing if you provide the
+ * correct combination of casts.
+ */
+
+#ifdef SHORTxSHORT_32		/* may work if 'int' is 32 bits */
+#define MULTIPLY16C16(var,const)  (((INT16) (var)) * ((INT16) (const)))
+#endif
+#ifdef SHORTxLCONST_32		/* known to work with Microsoft C 6.0 */
+#define MULTIPLY16C16(var,const)  (((INT16) (var)) * ((INT32) (const)))
+#endif
+
+#ifndef MULTIPLY16C16		/* default definition */
+#define MULTIPLY16C16(var,const)  ((var) * (const))
+#endif
+
+/* Same except both inputs are variables. */
+
+#ifdef SHORTxSHORT_32		/* may work if 'int' is 32 bits */
+#define MULTIPLY16V16(var1,var2)  (((INT16) (var1)) * ((INT16) (var2)))
+#endif
+
+#ifndef MULTIPLY16V16		/* default definition */
+#define MULTIPLY16V16(var1,var2)  ((var1) * (var2))
+#endif