/*====================================================================* - Copyright (C) 2001 Leptonica. All rights reserved. - This software is distributed in the hope that it will be - useful, but with NO WARRANTY OF ANY KIND. - No author or distributor accepts responsibility to anyone for the - consequences of using this software, or for whether it serves any - particular purpose or works at all, unless he or she says so in - writing. Everyone is granted permission to copy, modify and - redistribute this source code, for commercial or non-commercial - purposes, with the following restrictions: (1) the origin of this - source code must not be misrepresented; (2) modified versions must - be plainly marked as such; and (3) this notice may not be removed - or altered from any source or modified source distribution. *====================================================================*/ #ifndef LEPTONICA_PIX_H #define LEPTONICA_PIX_H /* * pix.h * * Contains the following structures: * struct Pix * struct PixColormap * struct RGBA_Quad * struct Pixa * struct Pixaa * struct Box * struct Boxa * struct Boxaa * struct Pta * struct Ptaa * struct Pixacc * struct PixTiling * struct FPix * struct FPixa * struct DPix * struct PixComp * struct PixaComp * * Contains definitions for: * Colors for RGB * Perceptual color weights * Colormap conversion flags * Rasterop bit flags * Structure access flags (for insert, copy, clone, copy-clone) * Sorting flags (by type and direction) * Blending flags * Graphics pixel setting flags * Size filtering flags * Color component selection flags * Rotation and shear flags * Affine transform order flags * Grayscale filling flags * Flags for setting to white or black * Dithering flags * Distance flags * Statistical measures * Set selection flags * Text orientation flags * Edge orientation flags * Line orientation flags * Scan direction flags * Horizontal warp * Pixel selection for resampling * Thinning flags * Runlength flags * Edge filter flags * Handling negative values in conversion to unsigned int * Subpixel color component ordering in LCD display * Relative to zero flags * HSV histogram flags * Region flags (inclusion, exclusion) * Flags for adding text to a pix * Flags for selecting display program */ /*-------------------------------------------------------------------------* * Basic Pix * *-------------------------------------------------------------------------*/ struct Pix { l_uint32 w; /* width in pixels */ l_uint32 h; /* height in pixels */ l_uint32 d; /* depth in bits */ l_uint32 wpl; /* 32-bit words/line */ l_uint32 refcount; /* reference count (1 if no clones) */ l_int32 xres; /* image res (ppi) in x direction */ /* (use 0 if unknown) */ l_int32 yres; /* image res (ppi) in y direction */ /* (use 0 if unknown) */ l_int32 informat; /* input file format, IFF_* */ char *text; /* text string associated with pix */ struct PixColormap *colormap; /* colormap (may be null) */ l_uint32 *data; /* the image data */ }; typedef struct Pix PIX; struct PixColormap { void *array; /* colormap table (array of RGBA_QUAD) */ l_int32 depth; /* of pix (1, 2, 4 or 8 bpp) */ l_int32 nalloc; /* number of color entries allocated */ l_int32 n; /* number of color entries used */ }; typedef struct PixColormap PIXCMAP; /* Colormap table entry (after the BMP version). * Note that the BMP format stores the colormap table exactly * as it appears here, with color samples being stored sequentially, * in the order (b,g,r,a). */ struct RGBA_Quad { l_uint8 blue; l_uint8 green; l_uint8 red; l_uint8 reserved; }; typedef struct RGBA_Quad RGBA_QUAD; /*-------------------------------------------------------------------------* * Colors for 32 bpp * *-------------------------------------------------------------------------*/ /* 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 not explicitly used in leptonica. * (2) If you redefine these values, functions that have the shifts * hardcoded (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. * Advice: Do not change these values! * (3) The shifts to extract the red, green and blue components * from a 32 bit pixel are defined in terms of these colors. */ 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 */ /*-------------------------------------------------------------------------* * Perceptual color weights * *-------------------------------------------------------------------------*/ /* Notes: * (1) These numbers are ad-hoc, but they do add up to 1. * Unlike, for example, the weighting factor for conversion * of RGB to luminance, or more specifically to Y in the * YUV colorspace. Those numbers come from the * International Telecommunications Union, via ITU-R. */ static const l_float32 L_RED_WEIGHT = 0.3; static const l_float32 L_GREEN_WEIGHT = 0.5; static const l_float32 L_BLUE_WEIGHT = 0.2; /*-------------------------------------------------------------------------* * Flags for colormap conversion * *-------------------------------------------------------------------------*/ enum { REMOVE_CMAP_TO_BINARY = 0, REMOVE_CMAP_TO_GRAYSCALE = 1, REMOVE_CMAP_TO_FULL_COLOR = 2, REMOVE_CMAP_BASED_ON_SRC = 3 }; /*-------------------------------------------------------------------------* * * 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 would like to 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 * * Now, 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. * * However, if you include Sun's xview package, you will get their * definitions, and because I like using these flags, we will * adopt the original Sun definitions to avoid redefinition conflicts. * * Then we have, for reference, the following 16 unique op flags: * * PIX_CLR 00000 0x0 * PIX_SET 11110 0x1e * PIX_SRC 11000 0x18 * PIX_DST 10100 0x14 * PIX_NOT(PIX_SRC) 00110 0x06 * PIX_NOT(PIX_DST) 01010 0x0a * PIX_SRC | PIX_DST 11100 0x1c * PIX_SRC & PIX_DST 10000 0x10 * PIX_SRC ^ PIX_DST 01100 0x0c * PIX_NOT(PIX_SRC) | PIX_DST 10110 0x16 * PIX_NOT(PIX_SRC) & PIX_DST 00100 0x04 * PIX_SRC | PIX_NOT(PIX_DST) 11010 0x1a * PIX_SRC & PIX_NOT(PIX_DST) 01000 0x08 * PIX_NOT(PIX_SRC | PIX_DST) 00010 0x02 * PIX_NOT(PIX_SRC & PIX_DST) 01110 0x0e * PIX_NOT(PIX_SRC ^ PIX_DST) 10010 0x12 * *-------------------------------------------------------------------------*/ #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) #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) /*-------------------------------------------------------------------------* * * 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) For 24-bit color images, use 32 bpp data, leaving * the fourth byte unused. Within each 4 byte pixel, the * colors are ordered from MSB to LSB, as follows: * * | MSB | 2nd MSB | 3rd MSB | LSB | * red green blue unused * 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) * * This specific color assignment is made in this file, * through the definitions of COLOR_RED, etc. Then the R, G * and B 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); * 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); * * For extra speed we extract the R, G and B colors directly * by shifting and masking, explicitly using the values in * L_RED_SHIFT, L_GREEN_SHIFT and L_BLUE_SHIFT: * (pixel32 >> L_RED_SHIFT) & 0xff; (red) * (pixel32 >> L_GREEN_SHIFT) & 0xff; (green) * (pixel32 >> L_BLUE_SHIFT) & 0xff; (blue) * All these operations work properly on both big- and little-endians. * * For a few situations, these color shift values are hard-coded. * Changing the RGB color component ordering through the assignments * in this file will cause functions marked with "***" to fail. * * (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 * *-------------------------------------------------------------------------*/ /*-------------------------------------------------------------------------* * 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; /* number of Pix in ptr array */ l_int32 nalloc; /* number of Pix ptrs allocated */ l_uint32 refcount; /* reference count (1 if no clones) */ struct Pix **pix; /* the array of ptrs to pix */ struct Boxa *boxa; /* array of boxes */ }; typedef struct Pixa PIXA; struct Pixaa { l_int32 n; /* number of Pixa in ptr array */ l_int32 nalloc; /* number of Pixa ptrs allocated */ struct Pixa **pixa; /* array of ptrs to pixa */ struct Boxa *boxa; /* array of boxes */ }; 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; /* reference count (1 if no clones) */ }; typedef struct Box BOX; struct Boxa { l_int32 n; /* number of box in ptr array */ l_int32 nalloc; /* number of box ptrs allocated */ l_uint32 refcount; /* reference count (1 if no clones) */ struct Box **box; /* box ptr array */ }; typedef struct Boxa BOXA; struct Boxaa { l_int32 n; /* number of boxa in ptr array */ l_int32 nalloc; /* number of boxa ptrs allocated */ struct Boxa **boxa; /* boxa ptr array */ }; typedef struct Boxaa BOXAA; /*-------------------------------------------------------------------------* * Array of points * *-------------------------------------------------------------------------*/ #define PTA_VERSION_NUMBER 1 struct Pta { l_int32 n; /* actual number of pts */ l_int32 nalloc; /* size of allocated arrays */ l_int32 refcount; /* reference count (1 if no clones) */ l_float32 *x, *y; /* arrays of floats */ }; typedef struct Pta PTA; /*-------------------------------------------------------------------------* * Array of Pta * *-------------------------------------------------------------------------*/ struct Ptaa { l_int32 n; /* number of pta in ptr array */ l_int32 nalloc; /* number of pta ptrs allocated */ struct Pta **pta; /* pta ptr array */ }; typedef struct Ptaa PTAA; /*-------------------------------------------------------------------------* * Pix accumulator container * *-------------------------------------------------------------------------*/ struct Pixacc { l_int32 w; /* array width */ l_int32 h; /* array height */ l_int32 offset; /* used to allow negative */ /* intermediate results */ struct Pix *pix; /* the 32 bit accumulator pix */ }; typedef struct Pixacc PIXACC; /*-------------------------------------------------------------------------* * Pix tiling * *-------------------------------------------------------------------------*/ struct PixTiling { struct Pix *pix; /* input pix (a clone) */ l_int32 nx; /* number of tiles horizontally */ l_int32 ny; /* number of tiles vertically */ l_int32 w; /* tile width */ l_int32 h; /* tile height */ l_int32 xoverlap; /* overlap on left and right */ l_int32 yoverlap; /* overlap on top and bottom */ l_int32 strip; /* strip for paint; default is TRUE */ }; typedef struct PixTiling PIXTILING; /*-------------------------------------------------------------------------* * FPix: pix with float array * *-------------------------------------------------------------------------*/ #define FPIX_VERSION_NUMBER 1 struct FPix { l_int32 w; /* width in pixels */ l_int32 h; /* height in pixels */ l_int32 wpl; /* 32-bit words/line */ l_int32 refcount; /* reference count (1 if no clones) */ l_int32 xres; /* image res (ppi) in x direction */ /* (use 0 if unknown) */ l_int32 yres; /* image res (ppi) in y direction */ /* (use 0 if unknown) */ l_float32 *data; /* the float image data */ }; typedef struct FPix FPIX; struct FPixa { l_int32 n; /* number of Pix in ptr array */ l_int32 nalloc; /* number of Pix ptrs allocated */ l_uint32 refcount; /* reference count (1 if no clones) */ struct FPix **fpix; /* the array of ptrs to fpix */ }; typedef struct FPixa FPIXA; /*-------------------------------------------------------------------------* * DPix: pix with double array * *-------------------------------------------------------------------------*/ #define DPIX_VERSION_NUMBER 1 struct DPix { l_int32 w; /* width in pixels */ l_int32 h; /* height in pixels */ l_int32 wpl; /* 32-bit words/line */ l_int32 refcount; /* reference count (1 if no clones) */ l_int32 xres; /* image res (ppi) in x direction */ /* (use 0 if unknown) */ l_int32 yres; /* image res (ppi) in y direction */ /* (use 0 if unknown) */ l_float64 *data; /* the double image data */ }; typedef struct DPix DPIX; /*-------------------------------------------------------------------------* * PixComp: compressed pix * *-------------------------------------------------------------------------*/ struct PixComp { l_int32 w; /* width in pixels */ l_int32 h; /* height in pixels */ l_int32 d; /* depth in bits */ l_int32 xres; /* image res (ppi) in x direction */ /* (use 0 if unknown) */ l_int32 yres; /* image res (ppi) in y direction */ /* (use 0 if unknown) */ l_int32 comptype; /* compressed format (IFF_TIFF_G4, */ /* IFF_PNG, IFF_JFIF_JPEG) */ char *text; /* text string associated with pix */ l_int32 cmapflag; /* flag (1 for cmap, 0 otherwise) */ l_uint8 *data; /* the compressed image data */ size_t size; /* size of the data array */ }; typedef struct PixComp PIXC; /*-------------------------------------------------------------------------* * PixaComp: array of compressed pix * *-------------------------------------------------------------------------*/ #define PIXACOMP_VERSION_NUMBER 1 struct PixaComp { l_int32 n; /* number of PixComp in ptr array */ l_int32 nalloc; /* number of PixComp ptrs allocated */ struct PixComp **pixc; /* the array of ptrs to PixComp */ struct Boxa *boxa; /* array of boxes */ }; typedef struct PixaComp PIXAC; /*-------------------------------------------------------------------------* * Access and storage flags * *-------------------------------------------------------------------------*/ /* * 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. Safe to do unless you're changing * data through one of the handles but don't want those * changes to be seen by the other handle.) * * 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., that * you don't own!). You must not free or insert such a string! * Specifically, for an Sarray, the copyflag for retrieval is either: * TRUE (or 1 or L_COPY) * or * FALSE (or 0 or L_NOCOPY) * For insertion, the copyflag is either: * TRUE (or 1 or L_COPY) * or * FALSE (or 0 or L_INSERT) * Note that L_COPY is always 1, and L_INSERT and L_NOCOPY are always 0. */ enum { L_INSERT = 0, /* stuff it in; no copy, clone or copy-clone */ L_COPY = 1, /* make/use a copy of the object */ L_CLONE = 2, /* make/use clone (ref count) of the object */ L_COPY_CLONE = 3 /* make a new object and fill with with clones */ /* of each object in the array(s) */ }; static const l_int32 L_NOCOPY = 0; /* copyflag value in sarrayGetString() */ /*--------------------------------------------------------------------------* * Sort flags * *--------------------------------------------------------------------------*/ enum { L_SORT_INCREASING = 1, /* sort in increasing order */ L_SORT_DECREASING = 2 /* sort in decreasing order */ }; enum { L_SORT_BY_X = 3, /* sort box or c.c. by horiz location */ L_SORT_BY_Y = 4, /* sort box or c.c. by vert location */ L_SORT_BY_WIDTH = 5, /* sort box or c.c. by width */ L_SORT_BY_HEIGHT = 6, /* sort box or c.c. by height */ L_SORT_BY_MIN_DIMENSION = 7, /* sort box or c.c. by min dimension */ L_SORT_BY_MAX_DIMENSION = 8, /* sort box or c.c. by max dimension */ L_SORT_BY_PERIMETER = 9, /* sort box or c.c. by perimeter */ L_SORT_BY_AREA = 10, /* sort box or c.c. by area */ L_SORT_BY_ASPECT_RATIO = 11 /* sort box or c.c. by width/height ratio */ }; /*-------------------------------------------------------------------------* * Blend flags * *-------------------------------------------------------------------------*/ enum { L_BLEND_WITH_INVERSE = 1, /* add some of src inverse to itself */ L_BLEND_TO_WHITE = 2, /* shift src colors towards white */ L_BLEND_TO_BLACK = 3, /* shift src colors towards black */ L_BLEND_GRAY = 4, /* blend src directly with blender */ L_BLEND_GRAY_WITH_INVERSE = 5 /* add amount of src inverse to itself, */ /* based on blender pix value */ }; enum { L_PAINT_LIGHT = 1, /* colorize non-black pixels */ L_PAINT_DARK = 2 /* colorize non-white pixels */ }; /*-------------------------------------------------------------------------* * Graphics pixel setting * *-------------------------------------------------------------------------*/ enum { L_SET_PIXELS = 1, /* set all bits in each pixel to 1 */ L_CLEAR_PIXELS = 2, /* set all bits in each pixel to 0 */ L_FLIP_PIXELS = 3 /* flip all bits in each pixel */ }; /*-------------------------------------------------------------------------* * Size filter flags * *-------------------------------------------------------------------------*/ enum { L_SELECT_WIDTH = 1, /* width must satisfy constraint */ L_SELECT_HEIGHT = 2, /* height must satisfy constraint */ L_SELECT_IF_EITHER = 3, /* either width or height can satisfy */ L_SELECT_IF_BOTH = 4 /* both width and height must satisfy */ }; enum { L_SELECT_IF_LT = 1, /* save if value is less than threshold */ L_SELECT_IF_GT = 2, /* save if value is more than threshold */ L_SELECT_IF_LTE = 3, /* save if value is <= to the threshold */ L_SELECT_IF_GTE = 4 /* save if value is >= to the threshold */ }; /*-------------------------------------------------------------------------* * Color component selection flags * *-------------------------------------------------------------------------*/ enum { L_SELECT_RED = 1, /* use red component */ L_SELECT_GREEN = 2, /* use green component */ L_SELECT_BLUE = 3, /* use blue component */ L_SELECT_MIN = 4, /* use min color component */ L_SELECT_MAX = 5 /* use max color component */ }; /*-------------------------------------------------------------------------* * Rotate and shear flags * *-------------------------------------------------------------------------*/ enum { L_ROTATE_AREA_MAP = 1, /* use area map rotation, if possible */ L_ROTATE_SHEAR = 2, /* use shear rotation */ L_ROTATE_SAMPLING = 3 /* use sampling */ }; enum { L_BRING_IN_WHITE = 1, /* bring in white pixels from the outside */ L_BRING_IN_BLACK = 2 /* bring in black pixels from the outside */ }; enum { L_SHEAR_ABOUT_CORNER = 1, /* shear image about UL corner */ L_SHEAR_ABOUT_CENTER = 2 /* shear image about center */ }; /*-------------------------------------------------------------------------* * Affine transform order flags * *-------------------------------------------------------------------------*/ enum { L_TR_SC_RO = 1, /* translate, scale, rotate */ L_SC_RO_TR = 2, /* scale, rotate, translate */ L_RO_TR_SC = 3, /* rotate, translate, scale */ L_TR_RO_SC = 4, /* translate, rotate, scale */ L_RO_SC_TR = 5, /* rotate, scale, translate */ L_SC_TR_RO = 6 /* scale, translate, rotate */ }; /*-------------------------------------------------------------------------* * Grayscale filling flags * *-------------------------------------------------------------------------*/ enum { L_FILL_WHITE = 1, /* fill white pixels (e.g, in fg map) */ L_FILL_BLACK = 2 /* fill black pixels (e.g., in bg map) */ }; /*-------------------------------------------------------------------------* * Flags for setting to white or black * *-------------------------------------------------------------------------*/ enum { L_SET_WHITE = 1, /* set pixels to white */ L_SET_BLACK = 2 /* set pixels to black */ }; /*-------------------------------------------------------------------------* * 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, /* dist to black with no prop; 1 bpp */ DEFAULT_CLIP_UPPER_1 = 10, /* dist to black with no prop; 1 bpp */ DEFAULT_CLIP_LOWER_2 = 5, /* dist to black with no prop; 2 bpp */ DEFAULT_CLIP_UPPER_2 = 5 /* dist to black with no prop; 2 bpp */ }; /*-------------------------------------------------------------------------* * Distance flags * *-------------------------------------------------------------------------*/ enum { L_MANHATTAN_DISTANCE = 1, /* L1 distance (e.g., in color space) */ L_EUCLIDEAN_DISTANCE = 2 /* L2 distance */ }; /*-------------------------------------------------------------------------* * Statistical measures * *-------------------------------------------------------------------------*/ enum { L_MEAN_ABSVAL = 1, /* average of abs values */ L_MEDIAN_VAL = 2, /* median value of set */ L_MODE_VAL = 3, /* mode value of set */ L_MODE_COUNT = 4, /* mode count of set */ L_ROOT_MEAN_SQUARE = 5, /* rms of values */ L_STANDARD_DEVIATION = 6, /* standard deviation from mean */ L_VARIANCE = 7 /* variance of values */ }; /*-------------------------------------------------------------------------* * Set selection flags * *-------------------------------------------------------------------------*/ enum { L_CHOOSE_CONSECUTIVE = 1, /* select 'n' consecutive */ L_CHOOSE_SKIP_BY = 2 /* select at intervals of 'n' */ }; /*-------------------------------------------------------------------------* * Text orientation flags * *-------------------------------------------------------------------------*/ enum { L_TEXT_ORIENT_UNKNOWN = 0, /* low confidence on text orientation */ L_TEXT_ORIENT_UP = 1, /* portrait, text rightside-up */ L_TEXT_ORIENT_LEFT = 2, /* landscape, text up to left */ L_TEXT_ORIENT_DOWN = 3, /* portrait, text upside-down */ L_TEXT_ORIENT_RIGHT = 4 /* landscape, text up to right */ }; /*-------------------------------------------------------------------------* * Edge orientation flags * *-------------------------------------------------------------------------*/ enum { L_HORIZONTAL_EDGES = 0, /* filters for horizontal edges */ L_VERTICAL_EDGES = 1, /* filters for vertical edges */ L_ALL_EDGES = 2 /* filters for all edges */ }; /*-------------------------------------------------------------------------* * Line orientation flags * *-------------------------------------------------------------------------*/ enum { L_HORIZONTAL_LINE = 0, /* horizontal line */ L_POS_SLOPE_LINE = 1, /* 45 degree line with positive slope */ L_VERTICAL_LINE = 2, /* vertical line */ L_NEG_SLOPE_LINE = 3, /* 45 degree line with negative slope */ L_OBLIQUE_LINE = 4 /* neither horizontal nor vertical */ }; /*-------------------------------------------------------------------------* * Scan direction flags * *-------------------------------------------------------------------------*/ enum { L_FROM_LEFT = 0, /* scan from left */ L_FROM_RIGHT = 1, /* scan from right */ L_FROM_TOP = 2, /* scan from top */ L_FROM_BOTTOM = 3 /* scan from bottom */ }; /*-------------------------------------------------------------------------* * Horizontal warp * *-------------------------------------------------------------------------*/ enum { L_WARP_TO_LEFT = 1, /* increasing stretch or contraction to left */ L_WARP_TO_RIGHT = 2 /* increasing stretch or contraction to right */ }; enum { L_LINEAR_WARP = 1, /* stretch or contraction grows linearly */ L_QUADRATIC_WARP = 2 /* stretch or contraction grows quadratically */ }; /*-------------------------------------------------------------------------* * Pixel selection for resampling * *-------------------------------------------------------------------------*/ enum { L_INTERPOLATED = 1, /* linear interpolation from src pixels */ L_SAMPLED = 2 /* nearest src pixel sampling only */ }; /*-------------------------------------------------------------------------* * Thinning flags * *-------------------------------------------------------------------------*/ enum { L_THIN_FG = 1, /* thin foreground of 1 bpp image */ L_THIN_BG = 2 /* thin background of 1 bpp image */ }; /*-------------------------------------------------------------------------* * Runlength flags * *-------------------------------------------------------------------------*/ enum { L_HORIZONTAL_RUNS = 0, /* determine runlengths of horizontal runs */ L_VERTICAL_RUNS = 1 /* determine runlengths of vertical runs */ }; /*-------------------------------------------------------------------------* * Edge filter flags * *-------------------------------------------------------------------------*/ enum { L_SOBEL_EDGE = 1, /* Sobel edge filter */ L_TWO_SIDED_EDGE = 2 /* Two-sided edge filter */ }; /*-------------------------------------------------------------------------* * Handling negative values in conversion to unsigned int * *-------------------------------------------------------------------------*/ enum { L_CLIP_TO_ZERO = 1, /* Clip negative values to 0 */ L_TAKE_ABSVAL = 2 /* Convert to positive using L_ABS() */ }; /*-------------------------------------------------------------------------* * Subpixel color component ordering in LCD display * *-------------------------------------------------------------------------*/ enum { L_SUBPIXEL_ORDER_RGB = 1, /* sensor order left-to-right RGB */ L_SUBPIXEL_ORDER_BGR = 2, /* sensor order left-to-right BGR */ L_SUBPIXEL_ORDER_VRGB = 3, /* sensor order top-to-bottom RGB */ L_SUBPIXEL_ORDER_VBGR = 4 /* sensor order top-to-bottom BGR */ }; /*-------------------------------------------------------------------------* * Relative to zero flags * *-------------------------------------------------------------------------*/ enum { L_LESS_THAN_ZERO = 1, /* Choose values less than zero */ L_EQUAL_TO_ZERO = 2, /* Choose values equal to zero */ L_GREATER_THAN_ZERO = 3 /* Choose values greater than zero */ }; /*-------------------------------------------------------------------------* * HSV histogram flags * *-------------------------------------------------------------------------*/ enum { L_HS_HISTO = 1, /* Use hue-saturation histogram */ L_HV_HISTO = 2, /* Use hue-value histogram */ L_SV_HISTO = 3 /* Use saturation-value histogram */ }; /*-------------------------------------------------------------------------* * Region flags (inclusion, exclusion) * *-------------------------------------------------------------------------*/ enum { L_INCLUDE_REGION = 1, /* Use hue-saturation histogram */ L_EXCLUDE_REGION = 2 /* Use hue-value histogram */ }; /*-------------------------------------------------------------------------* * Flags for adding text to a pix * *-------------------------------------------------------------------------*/ enum { L_ADD_ABOVE = 1, /* Add text above the image */ L_ADD_AT_TOP = 2, /* Add text over the top of the image */ L_ADD_AT_BOTTOM = 3, /* Add text over the bottom of the image */ L_ADD_BELOW = 4 /* Add text below the image */ }; /*-------------------------------------------------------------------------* * Flags for selecting display program * *-------------------------------------------------------------------------*/ enum { L_DISPLAY_WITH_XV = 1, /* Use xv with pixDisplay() */ L_DISPLAY_WITH_XLI = 2, /* Use xli with pixDisplay() */ L_DISPLAY_WITH_XZGV = 3, /* Use xzgv with pixDisplay() */ L_DISPLAY_WITH_IV = 4 /* Use irfvanview with pixDisplay() */ }; #endif /* LEPTONICA_PIX_H */