pix.h

Go to the documentation of this file.

/*====================================================================*
 -  Copyright (C) 2001 Leptonica.  All rights reserved.
 -
 -  Redistribution and use in source and binary forms, with or without
 -  modification, are permitted provided that the following conditions
 -  are met:
 -  1. Redistributions of source code must retain the above copyright
 -     notice, this list of conditions and the following disclaimer.
 -  2. Redistributions in binary form must reproduce the above
 -     copyright notice, this list of conditions and the following
 -     disclaimer in the documentation and/or other materials
 -     provided with the distribution.
 -
 -  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 -  ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 -  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 -  A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL ANY
 -  CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 -  EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 -  PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 -  PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 -  OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 -  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 -  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *====================================================================*/

#ifndef  LEPTONICA_PIX_H
#define  LEPTONICA_PIX_H

/*-------------------------------------------------------------------------*
 *                              Basic Pix                                  *
 *-------------------------------------------------------------------------*/
    /* The 'special' field is by default 0, but it can hold integers
     * that direct non-default actions, e.g., in png and jpeg I/O. */

struct Pix
{
    l_uint32             w;         
    l_uint32             h;         
    l_uint32             d;         
    l_uint32             spp;       
    l_uint32             wpl;       
    l_uint32             refcount;  
    l_int32              xres;      
    l_int32              yres;      
    l_int32              informat;  
    l_int32              special;   
    char                *text;      
    struct PixColormap  *colormap;  
    l_uint32            *data;      
};
typedef struct Pix PIX;

struct PixColormap
{
    void            *array;   
    l_int32          depth;   
    l_int32          nalloc;  
    l_int32          n;       
};
typedef struct PixColormap  PIXCMAP;


struct RGBA_Quad
{
    l_uint8     blue;         
    l_uint8     green;        
    l_uint8     red;          
    l_uint8     alpha;        
};
typedef struct RGBA_Quad  RGBA_QUAD;



/*-------------------------------------------------------------------------*
 *                             Colors for 32 bpp                           *
 *-------------------------------------------------------------------------*/
/* <pre>
 *  Notes:
 *      (1) These are the byte indices for colors in 32 bpp images.
 *          They are used through the GET/SET_DATA_BYTE accessors.
 *          The 4th byte, typically known as the "alpha channel" and used
 *          for blending, is used to a small extent in leptonica.
 *      (2) Do not change these values!  If you redefine them, functions
 *          that have the shifts hardcoded for efficiency and conciseness
 *          (instead of using the constants below) will break.  These
 *          functions are labelled with "***"  next to their names at
 *          the top of the files in which they are defined.
 *      (3) The shifts to extract the red, green, blue and alpha components
 *          from a 32 bit pixel are defined here.
 * </pre>
 */

enum {
    COLOR_RED = 0,        
    COLOR_GREEN = 1,      
    COLOR_BLUE = 2,       
    L_ALPHA_CHANNEL = 3   
};

static const l_int32  L_RED_SHIFT =
       8 * (sizeof(l_uint32) - 1 - COLOR_RED);           /* 24 */
static const l_int32  L_GREEN_SHIFT =
       8 * (sizeof(l_uint32) - 1 - COLOR_GREEN);         /* 16 */
static const l_int32  L_BLUE_SHIFT =
       8 * (sizeof(l_uint32) - 1 - COLOR_BLUE);          /*  8 */
static const l_int32  L_ALPHA_SHIFT =
       8 * (sizeof(l_uint32) - 1 - L_ALPHA_CHANNEL);     /*  0 */


/*-------------------------------------------------------------------------*
 *                       Colors for drawing boxes                          *
 *-------------------------------------------------------------------------*/
enum {
    L_DRAW_RED = 0,         
    L_DRAW_GREEN = 1,       
    L_DRAW_BLUE = 2,        
    L_DRAW_SPECIFIED = 3,   
    L_DRAW_RGB = 4,         
    L_DRAW_RANDOM = 5       
};


/*-------------------------------------------------------------------------*
 *                       Perceptual color weights                          *
 *-------------------------------------------------------------------------*/
/* <pre>
 *  Notes:
 *      (1) These perceptual weighting factors are ad-hoc, but they do
 *          add up to 1.  Unlike, for example, the weighting factors for
 *          converting RGB to luminance, or more specifically to Y in the
 *          YUV colorspace.  Those numbers come from the
 *          International Telecommunications Union, via ITU-R.
 * </pre>
 */
static const l_float32 L_RED_WEIGHT =   0.3f; 
static const l_float32 L_GREEN_WEIGHT = 0.5f; 
static const l_float32 L_BLUE_WEIGHT =  0.2f; 
/*-------------------------------------------------------------------------*
 *                        Flags for colormap conversion                    *
 *-------------------------------------------------------------------------*/
enum {
    REMOVE_CMAP_TO_BINARY = 0,     
    REMOVE_CMAP_TO_GRAYSCALE = 1,  
    REMOVE_CMAP_TO_FULL_COLOR = 2, 
    REMOVE_CMAP_WITH_ALPHA = 3,    
    REMOVE_CMAP_BASED_ON_SRC = 4   
};


/*------------------------------------------------------------------------*
 *!
 * <pre>
 * The following operation bit flags have been modified from
 * Sun's pixrect.h.
 *
 * The 'op' in 'rasterop' is represented by an integer
 * composed with Boolean functions using the set of five integers
 * given below.  The integers, and the op codes resulting from
 * boolean expressions on them, need only be in the range from 0 to 15.
 * The function is applied on a per-pixel basis.
 *
 * Examples: the op code representing ORing the src and dest
 * is computed using the bit OR, as PIX_SRC | PIX_DST;  the op
 * code representing XORing src and dest is found from
 * PIX_SRC ^ PIX_DST;  the op code representing ANDing src and dest
 * is found from PIX_SRC & PIX_DST.  Note that
 * PIX_NOT(PIX_CLR) = PIX_SET, and v.v., as they must be.
 *
 * We use the following set of definitions:
 *
 *      #define   PIX_SRC      0xc
 *      #define   PIX_DST      0xa
 *      #define   PIX_NOT(op)  (op) ^ 0xf
 *      #define   PIX_CLR      0x0
 *      #define   PIX_SET      0xf
 *
 * These definitions differ from Sun's, in that Sun left-shifted
 * each value by 1 pixel, and used the least significant bit as a
 * flag for the "pseudo-operation" of clipping.  We don't need
 * this bit, because it is both efficient and safe ALWAYS to clip
 * the rectangles to the src and dest images, which is what we do.
 * See the notes in rop.h on the general choice of these bit flags.
 *
 * [If for some reason you need compatibility with Sun's xview package,
 * you can adopt the original Sun definitions to avoid redefinition conflicts:
 *
 *      #define   PIX_SRC      (0xc << 1)
 *      #define   PIX_DST      (0xa << 1)
 *      #define   PIX_NOT(op)  ((op) ^ 0x1e)
 *      #define   PIX_CLR      (0x0 << 1)
 *      #define   PIX_SET      (0xf << 1)
 * ]
 *
 * We have, for reference, the following 16 unique op flags:
 *
 *      PIX_CLR                           0000             0x0
 *      PIX_SET                           1111             0xf
 *      PIX_SRC                           1100             0xc
 *      PIX_DST                           1010             0xa
 *      PIX_NOT(PIX_SRC)                  0011             0x3
 *      PIX_NOT(PIX_DST)                  0101             0x5
 *      PIX_SRC | PIX_DST                 1110             0xe
 *      PIX_SRC & PIX_DST                 1000             0x8
 *      PIX_SRC ^ PIX_DST                 0110             0x6
 *      PIX_NOT(PIX_SRC) | PIX_DST        1011             0xb
 *      PIX_NOT(PIX_SRC) & PIX_DST        0010             0x2
 *      PIX_SRC | PIX_NOT(PIX_DST)        1101             0xd
 *      PIX_SRC & PIX_NOT(PIX_DST)        0100             0x4
 *      PIX_NOT(PIX_SRC | PIX_DST)        0001             0x1
 *      PIX_NOT(PIX_SRC & PIX_DST)        0111             0x7
 *      PIX_NOT(PIX_SRC ^ PIX_DST)        1001             0x9
 *
 * </pre>
 *-------------------------------------------------------------------------*/

#define   PIX_SRC      (0xc)                      
#define   PIX_DST      (0xa)                      
#define   PIX_NOT(op)  ((op) ^ 0x0f)              
#define   PIX_CLR      (0x0)                      
#define   PIX_SET      (0xf)                      
#define   PIX_PAINT    (PIX_SRC | PIX_DST)        
#define   PIX_MASK     (PIX_SRC & PIX_DST)        
#define   PIX_SUBTRACT (PIX_DST & PIX_NOT(PIX_SRC)) 
#define   PIX_XOR      (PIX_SRC ^ PIX_DST)        
/*-------------------------------------------------------------------------*
 * <pre>
 *   Important Notes:
 *
 *       (1) The image data is stored in a single contiguous
 *           array of l_uint32, into which the pixels are packed.
 *           By "packed" we mean that there are no unused bits
 *           between pixels, except for end-of-line padding to
 *           satisfy item (2) below.
 *
 *       (2) Every image raster line begins on a 32-bit word
 *           boundary within this array.
 *
 *       (3) Pix image data is stored in 32-bit units, with the
 *           pixels ordered from left to right in the image being
 *           stored in order from the MSB to LSB within the word,
 *           for both big-endian and little-endian machines.
 *           This is the natural ordering for big-endian machines,
 *           as successive bytes are stored and fetched progressively
 *           to the right.  However, for little-endians, when storing
 *           we re-order the bytes from this byte stream order, and
 *           reshuffle again for byte access on 32-bit entities.
 *           So if the bytes come in sequence from left to right, we
 *           store them on little-endians in byte order:
 *                3 2 1 0 7 6 5 4 ...
 *           This MSB to LSB ordering allows left and right shift
 *           operations on 32 bit words to move the pixels properly.
 *
 *       (4) We use 32 bit pixels for both RGB and RGBA color images.
 *           The A (alpha) byte is ignored in most leptonica functions
 *           operating on color images.  Within each 4 byte pixel, the
 *           color samples are ordered from MSB to LSB, as follows:
 *
 *                |  MSB  |  2nd MSB  |  3rd MSB  |  LSB  |
 *                   red      green       blue      alpha
 *                    0         1           2         3   (big-endian)
 *                    3         2           1         0   (little-endian)
 *
 *           Because we use MSB to LSB ordering within the 32-bit word,
 *           the individual 8-bit samples can be accessed with
 *           GET_DATA_BYTE and SET_DATA_BYTE macros, using the
 *           (implicitly big-ending) ordering
 *                 red:    byte 0  (MSB)
 *                 green:  byte 1  (2nd MSB)
 *                 blue:   byte 2  (3rd MSB)
 *                 alpha:  byte 3  (LSB)
 *
 *           The specific color assignment is made in this file,
 *           through the definitions of COLOR_RED, etc.  Then the R, G
 *           B and A sample values can be retrieved using
 *                 redval = GET_DATA_BYTE(&pixel, COLOR_RED);
 *                 greenval = GET_DATA_BYTE(&pixel, COLOR_GREEN);
 *                 blueval = GET_DATA_BYTE(&pixel, COLOR_BLUE);
 *                 alphaval = GET_DATA_BYTE(&pixel, L_ALPHA_CHANNEL);
 *           and they can be set with
 *                 SET_DATA_BYTE(&pixel, COLOR_RED, redval);
 *                 SET_DATA_BYTE(&pixel, COLOR_GREEN, greenval);
 *                 SET_DATA_BYTE(&pixel, COLOR_BLUE, blueval);
 *                 SET_DATA_BYTE(&pixel, L_ALPHA_CHANNEL, alphaval);
 *
 *           More efficiently, these components can be extracted directly
 *           by shifting and masking, explicitly using the values in
 *           L_RED_SHIFT, etc.:
 *                 (pixel32 >> L_RED_SHIFT) & 0xff;         (red)
 *                 (pixel32 >> L_GREEN_SHIFT) & 0xff;       (green)
 *                 (pixel32 >> L_BLUE_SHIFT) & 0xff;        (blue)
 *                 (pixel32 >> L_ALPHA_SHIFT) & 0xff;       (alpha)
 *           The functions extractRGBValues() and extractRGBAValues() are
 *           provided to do this.  Likewise, the pixels can be set
 *           directly by shifting, using composeRGBPixel() and
 *           composeRGBAPixel().
 *
 *           All these operations work properly on both big- and little-endians.
 *
 *       (5) A reference count is held within each pix, giving the
 *           number of ptrs to the pix.  When a pixClone() call
 *           is made, the ref count is increased by 1, and
 *           when a pixDestroy() call is made, the reference count
 *           of the pix is decremented.  The pix is only destroyed
 *           when the reference count goes to zero.
 *
 *       (6) The version numbers (below) are used in the serialization
 *           of these data structures.  They are placed in the files,
 *           and rarely (if ever) change.  Provision is currently made for
 *           backward compatibility in reading from boxaa version 2.
 *
 *       (7) The serialization dependencies are as follows:
 *               pixaa  :  pixa  :  boxa
 *               boxaa  :  boxa
 *           So, for example, pixaa and boxaa can be changed without
 *           forcing a change in pixa or boxa.  However, if pixa is
 *           changed, it forces a change in pixaa, and if boxa is
 *           changed, if forces a change in the other three.
 *           We define four version numbers:
 *               PIXAA_VERSION_NUMBER
 *               PIXA_VERSION_NUMBER
 *               BOXAA_VERSION_NUMBER
 *               BOXA_VERSION_NUMBER
 * </pre>
 *-------------------------------------------------------------------------*/



/*-------------------------------------------------------------------------*
 *                              Array of pix                               *
 *-------------------------------------------------------------------------*/

    /*  Serialization for primary data structures */
#define  PIXAA_VERSION_NUMBER      2  
#define  PIXA_VERSION_NUMBER       2  
#define  BOXA_VERSION_NUMBER       2  
#define  BOXAA_VERSION_NUMBER      3  
struct Pixa
{
    l_int32             n;          
    l_int32             nalloc;     
    l_uint32            refcount;   
    struct Pix        **pix;        
    struct Boxa        *boxa;       
};
typedef struct Pixa PIXA;

struct Pixaa
{
    l_int32             n;          
    l_int32             nalloc;     
    struct Pixa       **pixa;       
    struct Boxa        *boxa;       
};
typedef struct Pixaa PIXAA;


/*-------------------------------------------------------------------------*
 *                    Basic rectangle and rectangle arrays                 *
 *-------------------------------------------------------------------------*/

struct Box
{
    l_int32            x;           
    l_int32            y;           
    l_int32            w;           
    l_int32            h;           
    l_uint32           refcount;    
};
typedef struct Box    BOX;

struct Boxa
{
    l_int32            n;           
    l_int32            nalloc;      
    l_uint32           refcount;    
    struct Box       **box;         
};
typedef struct Boxa  BOXA;

struct Boxaa
{
    l_int32            n;           
    l_int32            nalloc;      
    struct Boxa      **boxa;        
};
typedef struct Boxaa  BOXAA;


/*-------------------------------------------------------------------------*
 *                               Array of points                           *
 *-------------------------------------------------------------------------*/
#define  PTA_VERSION_NUMBER      1  
struct Pta
{
    l_int32            n;           
    l_int32            nalloc;      
    l_uint32           refcount;    
    l_float32         *x, *y;       
};
typedef struct Pta PTA;


/*-------------------------------------------------------------------------*
 *                              Array of Pta                               *
 *-------------------------------------------------------------------------*/

struct Ptaa
{
    l_int32              n;         
    l_int32              nalloc;    
    struct Pta         **pta;       
};
typedef struct Ptaa PTAA;


/*-------------------------------------------------------------------------*
 *                       Pix accumulator container                         *
 *-------------------------------------------------------------------------*/

struct Pixacc
{
    l_int32             w;          
    l_int32             h;          
    l_int32             offset;     
    struct Pix         *pix;        
};
typedef struct Pixacc PIXACC;


/*-------------------------------------------------------------------------*
 *                              Pix tiling                                 *
 *-------------------------------------------------------------------------*/

struct PixTiling
{
    struct Pix          *pix;       
    l_int32              nx;        
    l_int32              ny;        
    l_int32              w;         
    l_int32              h;         
    l_int32              xoverlap;  
    l_int32              yoverlap;  
    l_int32              strip;     
};
typedef struct PixTiling PIXTILING;


/*-------------------------------------------------------------------------*
 *                       FPix: pix with float array                        *
 *-------------------------------------------------------------------------*/
#define  FPIX_VERSION_NUMBER      2 
struct FPix
{
    l_int32              w;         
    l_int32              h;         
    l_int32              wpl;       
    l_uint32             refcount;  
    l_int32              xres;      
    l_int32              yres;      
    l_float32           *data;      
};
typedef struct FPix FPIX;

struct FPixa
{
    l_int32             n;          
    l_int32             nalloc;     
    l_uint32            refcount;   
    struct FPix       **fpix;       
};
typedef struct FPixa FPIXA;


/*-------------------------------------------------------------------------*
 *                       DPix: pix with double array                       *
 *-------------------------------------------------------------------------*/
#define  DPIX_VERSION_NUMBER      2 
struct DPix
{
    l_int32              w;         
    l_int32              h;         
    l_int32              wpl;       
    l_uint32             refcount;  
    l_int32              xres;      
    l_int32              yres;      
    l_float64           *data;      
};
typedef struct DPix DPIX;


/*-------------------------------------------------------------------------*
 *                        PixComp: compressed pix                          *
 *-------------------------------------------------------------------------*/

struct PixComp
{
    l_int32              w;         
    l_int32              h;         
    l_int32              d;         
    l_int32              xres;      
    l_int32              yres;      
    l_int32              comptype;  
    char                *text;      
    l_int32              cmapflag;  
    l_uint8             *data;      
    size_t               size;      
};
typedef struct PixComp PIXC;


/*-------------------------------------------------------------------------*
 *                     PixaComp: array of compressed pix                   *
 *-------------------------------------------------------------------------*/
#define  PIXACOMP_VERSION_NUMBER 2  
struct PixaComp
{
    l_int32              n;         
    l_int32              nalloc;    
    l_int32              offset;    
    struct PixComp     **pixc;      
    struct Boxa         *boxa;      
};
typedef struct PixaComp PIXAC;


/*-------------------------------------------------------------------------*
 *                         Access and storage flags                        *
 *-------------------------------------------------------------------------*/
/*
 * <pre>
 *  For Pix, Box, Pta and Numa, there are 3 standard methods for handling
 *  the retrieval or insertion of a struct:
 *     (1) direct insertion (Don't do this if there is another handle
 *                           somewhere to this same struct!)
 *     (2) copy (Always safe, sets up a refcount of 1 on the new object.
 *               Can be undesirable if very large, such as an image or
 *               an array of images.)
 *     (3) clone (Makes another handle to the same struct, and bumps the
 *                refcount up by 1.  OK to use except in two situations:
 *                (a) You change data through one of the handles but don't
 *                    want those changes to be seen by the other handle.
 *                (b) The application is multi-threaded.  Because the clone
 *                    operation is not atomic (e.g., locked with a mutex),
 *                    it is possible to end up with an incorrect ref count,
 *                    causing either a memory leak or a crash.
 *
 *  For Pixa and Boxa, which are structs that hold an array of clonable
 *  structs, there is an additional method:
 *     (4) copy-clone (Makes a new higher-level struct with a refcount
 *                     of 1, but clones all the structs in the array.)
 *
 *  Unlike the other structs, when retrieving a string from an Sarray,
 *  you are allowed to get a handle without a copy or clone (i.e., the
 *  string is not owned by the handle).  You must not either free the string
 *  or insert it in some other struct that would own it.  Specifically,
 *  for an Sarray, the copyflag for retrieval is either:
 *         L_COPY or L_NOCOPY
 *  and for insertion, the copyflag is either:
 *         L_COPY or one of {L_INSERT , L_NOCOPY} (the latter are equivalent
 *                                                 for insertion))
 *  Typical patterns are:
 *  (1) Reference a string in an Sarray with L_NOCOPY and insert a copy
 *      of it in another Sarray with L_COPY.
 *  (2) Copy a string from an Sarray with L_COPY and insert it in
 *      another Sarray with L_INSERT (or L_NOCOPY).
 *  In both cases, a copy is made and both Sarrays own their instance
 *  of that string.
 * </pre>
 */

enum {
    L_NOCOPY = 0,     
    L_INSERT = L_NOCOPY,    
    L_COPY = 1,       
    L_CLONE = 2,      
    L_COPY_CLONE = 3  
};


/*----------------------------------------------------------------------------*
 *                              Sort flags                                    *
 *----------------------------------------------------------------------------*/

enum {
    L_SHELL_SORT = 1,            
    L_BIN_SORT = 2               
};

enum {
    L_SORT_INCREASING = 1,       
    L_SORT_DECREASING = 2        
};

enum {
    L_SORT_BY_X = 1,             
    L_SORT_BY_Y = 2,             
    L_SORT_BY_RIGHT = 3,         
    L_SORT_BY_BOT = 4,           
    L_SORT_BY_WIDTH = 5,         
    L_SORT_BY_HEIGHT = 6,        
    L_SORT_BY_MIN_DIMENSION = 7, 
    L_SORT_BY_MAX_DIMENSION = 8, 
    L_SORT_BY_PERIMETER = 9,     
    L_SORT_BY_AREA = 10,         
    L_SORT_BY_ASPECT_RATIO = 11  
};


/*---------------------------------------------------------------------------*
 *                             Blend flags                                   *
 *---------------------------------------------------------------------------*/

enum {
    L_BLEND_WITH_INVERSE = 1,     
    L_BLEND_TO_WHITE = 2,         
    L_BLEND_TO_BLACK = 3,         
    L_BLEND_GRAY = 4,             
    L_BLEND_GRAY_WITH_INVERSE = 5 
};

enum {
    L_PAINT_LIGHT = 1,            
    L_PAINT_DARK = 2              
};


/*-------------------------------------------------------------------------*
 *                        Graphics pixel setting                           *
 *-------------------------------------------------------------------------*/

enum {
    L_SET_PIXELS = 1,           
    L_CLEAR_PIXELS = 2,         
    L_FLIP_PIXELS = 3           
};


/*-------------------------------------------------------------------------*
 *                     Size and location filter flags                      *
 *-------------------------------------------------------------------------*/

enum {
    L_SELECT_IF_LT = 1,         
    L_SELECT_IF_GT = 2,         
    L_SELECT_IF_LTE = 3,        
    L_SELECT_IF_GTE = 4         
};

enum {
    L_SELECT_BY_WIDTH = 1,          
    L_SELECT_BY_HEIGHT = 2,         
    L_SELECT_BY_MAX_DIMENSION = 3,  
    L_SELECT_BY_AREA = 4,           
    L_SELECT_BY_PERIMETER = 5       
};

enum {
    L_SELECT_WIDTH = 1,         
    L_SELECT_HEIGHT = 2,        
    L_SELECT_XVAL = 3,          
    L_SELECT_YVAL = 4,          
    L_SELECT_IF_EITHER = 5,     
    L_SELECT_IF_BOTH = 6        
};

enum {
    L_CHECK_WIDTH = 1,          
    L_CHECK_HEIGHT = 2,         
    L_CHECK_BOTH = 3            
};


/*-------------------------------------------------------------------------*
 *                    Color component selection flags                      *
 *-------------------------------------------------------------------------*/

enum {
    L_SELECT_RED = 1,           
    L_SELECT_GREEN = 2,         
    L_SELECT_BLUE = 3,          
    L_SELECT_MIN = 4,           
    L_SELECT_MAX = 5,           
    L_SELECT_AVERAGE = 6,       
    L_SELECT_HUE = 7,           
    L_SELECT_SATURATION = 8     
};


/*-------------------------------------------------------------------------*
 *                         16-bit conversion flags                         *
 *-------------------------------------------------------------------------*/

enum {
    L_LS_BYTE = 1,              
    L_MS_BYTE = 2,              
    L_AUTO_BYTE = 3,            
    L_CLIP_TO_FF = 4,           
    L_LS_TWO_BYTES = 5,         
    L_MS_TWO_BYTES = 6,         
    L_CLIP_TO_FFFF = 7          
};


/*-------------------------------------------------------------------------*
 *                        Rotate and shear flags                           *
 *-------------------------------------------------------------------------*/

enum {
    L_ROTATE_AREA_MAP = 1,     
    L_ROTATE_SHEAR = 2,        
    L_ROTATE_SAMPLING = 3      
};

enum {
    L_BRING_IN_WHITE = 1,      
    L_BRING_IN_BLACK = 2       
};

enum {
    L_SHEAR_ABOUT_CORNER = 1,  
    L_SHEAR_ABOUT_CENTER = 2   
};


/*-------------------------------------------------------------------------*
 *                     Affine transform order flags                        *
 *-------------------------------------------------------------------------*/

enum {
    L_TR_SC_RO = 1,            
    L_SC_RO_TR = 2,            
    L_RO_TR_SC = 3,            
    L_TR_RO_SC = 4,            
    L_RO_SC_TR = 5,            
    L_SC_TR_RO = 6             
};


/*-------------------------------------------------------------------------*
 *                       Grayscale filling flags                           *
 *-------------------------------------------------------------------------*/

enum {
    L_FILL_WHITE = 1,         
    L_FILL_BLACK = 2          
};


/*-------------------------------------------------------------------------*
 *                   Flags for setting to white or black                   *
 *-------------------------------------------------------------------------*/

enum {
    L_SET_WHITE = 1,         
    L_SET_BLACK = 2          
};


/*-------------------------------------------------------------------------*
 *                  Flags for getting white or black value                 *
 *-------------------------------------------------------------------------*/

enum {
    L_GET_WHITE_VAL = 1,     
    L_GET_BLACK_VAL = 2      
};


/*-------------------------------------------------------------------------*
 *                  Flags for 8 bit and 16 bit pixel sums                  *
 *-------------------------------------------------------------------------*/

enum {
    L_WHITE_IS_MAX = 1, 
    L_BLACK_IS_MAX = 2  
};


/*-------------------------------------------------------------------------*
 *                           Dither parameters                             *
 *         If within this grayscale distance from black or white,          *
 *         do not propagate excess or deficit to neighboring pixels.       *
 *-------------------------------------------------------------------------*/

enum {
    DEFAULT_CLIP_LOWER_1 = 10, 
    DEFAULT_CLIP_UPPER_1 = 10, 
    DEFAULT_CLIP_LOWER_2 = 5,  
    DEFAULT_CLIP_UPPER_2 = 5   
};


/*-------------------------------------------------------------------------*
 *                             Distance flags                              *
 *-------------------------------------------------------------------------*/

enum {
    L_MANHATTAN_DISTANCE = 1,  
    L_EUCLIDEAN_DISTANCE = 2   
};


/*-------------------------------------------------------------------------*
 *                               Value flags                               *
 *-------------------------------------------------------------------------*/

enum {
    L_NEGATIVE = 1,      
    L_NON_NEGATIVE = 2,  
    L_POSITIVE = 3,      
    L_NON_POSITIVE = 4,  
    L_ZERO = 5,          
    L_ALL = 6            
};


/*-------------------------------------------------------------------------*
 *                         Statistical measures                            *
 *-------------------------------------------------------------------------*/

enum {
    L_MEAN_ABSVAL = 1,         
    L_MEDIAN_VAL = 2,          
    L_MODE_VAL = 3,            
    L_MODE_COUNT = 4,          
    L_ROOT_MEAN_SQUARE = 5,    
    L_STANDARD_DEVIATION = 6,  
    L_VARIANCE = 7             
};


/*-------------------------------------------------------------------------*
 *                          Set selection flags                            *
 *-------------------------------------------------------------------------*/

enum {
    L_CHOOSE_CONSECUTIVE = 1,  
    L_CHOOSE_SKIP_BY = 2       
};


/*-------------------------------------------------------------------------*
 *                         Text orientation flags                          *
 *-------------------------------------------------------------------------*/

enum {
    L_TEXT_ORIENT_UNKNOWN = 0, 
    L_TEXT_ORIENT_UP = 1,      
    L_TEXT_ORIENT_LEFT = 2,    
    L_TEXT_ORIENT_DOWN = 3,    
    L_TEXT_ORIENT_RIGHT = 4    
};


/*-------------------------------------------------------------------------*
 *                         Edge orientation flags                          *
 *-------------------------------------------------------------------------*/

enum {
    L_HORIZONTAL_EDGES = 0,   
    L_VERTICAL_EDGES = 1,     
    L_ALL_EDGES = 2           
};


/*-------------------------------------------------------------------------*
 *                         Line orientation flags                          *
 *-------------------------------------------------------------------------*/

enum {
    L_HORIZONTAL_LINE = 0,   
    L_POS_SLOPE_LINE = 1,    
    L_VERTICAL_LINE = 2,     
    L_NEG_SLOPE_LINE = 3,    
    L_OBLIQUE_LINE = 4       
};


/*-------------------------------------------------------------------------*
 *                         Image orientation flags                         *
 *-------------------------------------------------------------------------*/

enum {
    L_PORTRAIT_MODE = 0,   
    L_LANDSCAPE_MODE = 1   
};


/*-------------------------------------------------------------------------*
 *                           Scan direction flags                          *
 *-------------------------------------------------------------------------*/

enum {
    L_FROM_LEFT = 0,         
    L_FROM_RIGHT = 1,        
    L_FROM_TOP = 2,          
    L_FROM_BOT = 3,          
    L_SCAN_NEGATIVE = 4,     
    L_SCAN_POSITIVE = 5,     
    L_SCAN_BOTH = 6,         
    L_SCAN_HORIZONTAL = 7,   
    L_SCAN_VERTICAL = 8      
};


/*-------------------------------------------------------------------------*
 *                Box size adjustment and location flags                   *
 *-------------------------------------------------------------------------*/

enum {
    L_ADJUST_SKIP = 0,           
    L_ADJUST_LEFT = 1,           
    L_ADJUST_RIGHT = 2,          
    L_ADJUST_LEFT_AND_RIGHT = 3, 
    L_ADJUST_TOP = 4,            
    L_ADJUST_BOT = 5,            
    L_ADJUST_TOP_AND_BOT = 6,    
    L_ADJUST_CHOOSE_MIN = 7,     
    L_ADJUST_CHOOSE_MAX = 8,     
    L_SET_LEFT = 9,              
    L_SET_RIGHT = 10,            
    L_SET_TOP = 11,              
    L_SET_BOT = 12,              
    L_GET_LEFT = 13,             
    L_GET_RIGHT = 14,            
    L_GET_TOP = 15,              
    L_GET_BOT = 16               
};


/*-------------------------------------------------------------------------*
 *          Flags for modifying box boundaries using a second box          *
 *-------------------------------------------------------------------------*/

enum {
    L_USE_MINSIZE = 1,           
    L_USE_MAXSIZE = 2,           
    L_SUB_ON_LOC_DIFF = 3,       
    L_SUB_ON_SIZE_DIFF = 4,      
    L_USE_CAPPED_MIN = 5,        
    L_USE_CAPPED_MAX = 6         
};

/*-------------------------------------------------------------------------*
 *              Handling overlapping bounding boxes in boxa                *
 *-------------------------------------------------------------------------*/

enum {
    L_COMBINE = 1,         
    L_REMOVE_SMALL = 2     
};

/*-------------------------------------------------------------------------*
 *                    Flags for replacing invalid boxes                    *
 *-------------------------------------------------------------------------*/

enum {
    L_USE_ALL_BOXES = 1,         
    L_USE_SAME_PARITY_BOXES = 2  
};

/*-------------------------------------------------------------------------*
 *                            Horizontal warp                              *
 *-------------------------------------------------------------------------*/

enum {
    L_WARP_TO_LEFT = 1,    
    L_WARP_TO_RIGHT = 2    
};

enum {
    L_LINEAR_WARP = 1,     
    L_QUADRATIC_WARP = 2   
};


/*-------------------------------------------------------------------------*
 *                      Pixel selection for resampling                     *
 *-------------------------------------------------------------------------*/

enum {
    L_INTERPOLATED = 1,    
    L_SAMPLED = 2          
};


/*-------------------------------------------------------------------------*
 *                             Thinning flags                              *
 *-------------------------------------------------------------------------*/

enum {
    L_THIN_FG = 1,             
    L_THIN_BG = 2              
};


/*-------------------------------------------------------------------------*
 *                            Runlength flags                              *
 *-------------------------------------------------------------------------*/

enum {
    L_HORIZONTAL_RUNS = 0,   
    L_VERTICAL_RUNS = 1      
};


/*-------------------------------------------------------------------------*
 *                          Edge filter flags                              *
 *-------------------------------------------------------------------------*/

enum {
    L_SOBEL_EDGE = 1,        
    L_TWO_SIDED_EDGE = 2     
};


/*-------------------------------------------------------------------------*
 *             Subpixel color component ordering in LCD display            *
 *-------------------------------------------------------------------------*/

enum {
    L_SUBPIXEL_ORDER_RGB = 1,   
    L_SUBPIXEL_ORDER_BGR = 2,   
    L_SUBPIXEL_ORDER_VRGB = 3,  
    L_SUBPIXEL_ORDER_VBGR = 4   
};


/*-------------------------------------------------------------------------*
 *                          HSV histogram flags                            *
 *-------------------------------------------------------------------------*/

enum {
    L_HS_HISTO = 1,            
    L_HV_HISTO = 2,            
    L_SV_HISTO = 3             
};


/*-------------------------------------------------------------------------*
 *                    Region flags (inclusion, exclusion)                  *
 *-------------------------------------------------------------------------*/

enum {
    L_INCLUDE_REGION = 1,      
    L_EXCLUDE_REGION = 2       
};


/*-------------------------------------------------------------------------*
 *                    Flags for adding text to a pix                       *
 *-------------------------------------------------------------------------*/

enum {
    L_ADD_ABOVE = 1,           
    L_ADD_BELOW = 2,           
    L_ADD_LEFT = 3,            
    L_ADD_RIGHT = 4,           
    L_ADD_AT_TOP = 5,          
    L_ADD_AT_BOT = 6,          
    L_ADD_AT_LEFT = 7,         
    L_ADD_AT_RIGHT = 8         
};


/*-------------------------------------------------------------------------*
 *                       Flags for plotting on a pix                       *
 *-------------------------------------------------------------------------*/

enum {
    L_PLOT_AT_TOP = 1,         
    L_PLOT_AT_MID_HORIZ = 2,   
    L_PLOT_AT_BOT = 3,         
    L_PLOT_AT_LEFT = 4,        
    L_PLOT_AT_MID_VERT = 5,    
    L_PLOT_AT_RIGHT = 6        
};


/*-------------------------------------------------------------------------*
 *                   Flags for selecting display program                   *
 *-------------------------------------------------------------------------*/

enum {
    L_DISPLAY_WITH_XZGV = 1,  
    L_DISPLAY_WITH_XLI = 2,   
    L_DISPLAY_WITH_XV = 3,    
    L_DISPLAY_WITH_IV = 4,    
    L_DISPLAY_WITH_OPEN = 5   
};

/*-------------------------------------------------------------------------*
 *    Flag(s) used in the 'special' pix field for non-default operations   *
 *      - 0 is default for chroma sampling in jpeg                         *
 *      - 10-19 are used for zlib compression in png write                 *
 *      - 4 and 8 are used for specifying connectivity in labelling        *
 *-------------------------------------------------------------------------*/

enum {
    L_NO_CHROMA_SAMPLING_JPEG = 1   
};


/*-------------------------------------------------------------------------*
 *          Handling negative values in conversion to unsigned int         *
 *-------------------------------------------------------------------------*/

enum {
    L_CLIP_TO_ZERO = 1,      
    L_TAKE_ABSVAL = 2        
};


/*-------------------------------------------------------------------------*
 *                        Relative to zero flags                           *
 *-------------------------------------------------------------------------*/

enum {
    L_LESS_THAN_ZERO = 1,    
    L_EQUAL_TO_ZERO = 2,     
    L_GREATER_THAN_ZERO = 3  
};


/*-------------------------------------------------------------------------*
 *         Flags for adding or removing traling slash from string          *
 *-------------------------------------------------------------------------*/

enum {
    L_ADD_TRAIL_SLASH = 1,     
    L_REMOVE_TRAIL_SLASH = 2   
};


/*-------------------------------------------------------------------------*
 *               Pix allocator and deallocator function types              *
 *-------------------------------------------------------------------------*/
typedef void *(*alloc_fn)(size_t);

typedef void (*dealloc_fn)(void *);


#endif  /* LEPTONICA_PIX_H */