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/*
* bltImage.h --
*
* Copyright 1993-1998 Lucent Technologies, Inc.
*
* Permission to use, copy, modify, and distribute this software and
* its documentation for any purpose and without fee is hereby
* granted, provided that the above copyright notice appear in all
* copies and that both that the copyright notice and warranty
* disclaimer appear in supporting documentation, and that the names
* of Lucent Technologies any of their entities not be used in
* advertising or publicity pertaining to distribution of the software
* without specific, written prior permission.
*
* Lucent Technologies disclaims all warranties with regard to this
* software, including all implied warranties of merchantability and
* fitness. In no event shall Lucent Technologies be liable for any
* special, indirect or consequential damages or any damages
* whatsoever resulting from loss of use, data or profits, whether in
* an action of contract, negligence or other tortuous action, arising
* out of or in connection with the use or performance of this
* software.
*/
#include <X11/Xutil.h>
#ifndef WIN32
#include <X11/Xproto.h>
#endif
#ifndef _BLT_IMAGE_H
#define _BLT_IMAGE_H
#define Red rgba.red
#define Blue rgba.blue
#define Green rgba.green
#define Alpha rgba.alpha
/*
*----------------------------------------------------------------------
*
* Pix32 --
*
* A union representing either a pixel as a RGB triplet or a
* single word value.
*
*----------------------------------------------------------------------
*/
typedef union Pix32 {
unsigned int value; /* Lookup table address */
struct RGBA {
unsigned char red; /* Red intensity 0..255 */
unsigned char green; /* Green intensity 0.255 */
unsigned char blue; /* Blue intensity 0..255 */
unsigned char alpha; /* Alpha-channel for compositing. 0..255 */
} rgba;
unsigned char channel[4];
} Pix32;
typedef struct ColorInfo {
XColor exact, best;
float error;
unsigned int freq;
int allocated;
int index;
} ColorInfo;
/*
*----------------------------------------------------------------------
*
* ColorTable --
*
* For colormap-ed visuals, this structure contains color lookup
* information needed to translate RGB triplets to pixel indices.
*
* This structure isn't needed for TrueColor or Monochrome visuals.
*
* DirectColor:
* Pixel values for each color channel
* StaticColor, PsuedoColor, StaticGray, and GrayScale:
* Red represents the 8-bit color. Green and Blue pixel
* values are unused.
*
*----------------------------------------------------------------------
*/
typedef struct ColorTable {
Display *display; /* Display of colortable. Used to free
* colors allocated. */
XVisualInfo visualInfo; /* Visual information for window displaying
* the image. */
Colormap colorMap; /* Colormap used. This may be the default
* colormap, or an allocated private map. */
double gamma; /* Gamma correction value */
int flags;
unsigned int red[256], green[256], blue[256];
/* Array of allocated pixels in colormap */
ColorInfo colorInfo[256];
ColorInfo *sortedColors[256];
int nUsedColors, nFreeColors;
int nPixels; /* Number of colors in the quantized image */
unsigned long int pixelValues[256];
unsigned int *lut; /* Color lookup table. Used to collect frequencies
* of colors and later colormap indices */
} *ColorTable;
#define PRIVATE_COLORMAP 1
#define RGBIndex(r,g,b) (((r)<<10) + ((r)<<6) + (r) + ((g) << 5) + (g) + (b))
/*
*----------------------------------------------------------------------
*
* Colorimage --
*
* The structure below represents a color image. Each pixel
* occupies a 32-bit word of memory: one byte for each of the
* red, green, and blue color intensities, and another for
* alpha-channel image compositing (e.g. transparency).
*
* Even though the alpha-channel is usually unused, the standard
* packed format (a contiguous stream of 3-byte RGB values) like
* that of the Tk photo doesn't perform especially well for image
* processing operations, such as filtering or resampling, where
* pixel addressing is needed. It's especially woeful on RISC
* architectures.
*
*----------------------------------------------------------------------
*/
typedef struct Colorimage {
int width, height; /* Dimensions of the image */
Pix32 *dataPtr; /* Array of pixels representing the image. */
} *Colorimage;
/*
* Colorimage is supposed to be an opaque type.
* Use the macros below to access its members.
*/
#define ColorimageHeight(c) ((c)->height)
#define ColorimageWidth(c) ((c)->width)
#define ColorimageData(c) ((c)->dataPtr)
/*
*----------------------------------------------------------------------
*
* ImageFilterProc --
*
* A function implementing a 1-D filter.
*
*----------------------------------------------------------------------
*/
typedef double (ImageFilterProc) _ANSI_ARGS_((double value));
/*
*----------------------------------------------------------------------
*
* Image1DFilter --
*
* Contains information about a 1-D filter (its support and
* the procedure implementing the filter).
*
*----------------------------------------------------------------------
*/
typedef struct Image1DFilter {
float support; /* Radius of 1D filter */
ImageFilterProc *proc; /* Procedure to filter an image */
} *Image1DFilter;
extern Image1DFilter bltBoxFilter; /* The ubiquitous 1-D Box filter */
/*
*----------------------------------------------------------------------
*
* Image2DFilter --
*
* Defines a convolution mask for a 2-D filter. Used to smooth or
* enhance images.
*
*----------------------------------------------------------------------
*/
typedef struct Image2DFilter {
float support; /* Radius of filter */
float sum, scale; /* Sum of kernel */
float *kernel; /* Array of values (malloc-ed) representing
* the discrete 2-D filter. */
} Image2DFilter;
/* Prototypes of image routines */
extern void Blt_ColorimageToPhoto _ANSI_ARGS_((Colorimage image,
Tk_PhotoHandle photo));
extern Pixmap Blt_ColorimageToPixmap _ANSI_ARGS_((Tcl_Interp *interp,
Tk_Window tkwin, Colorimage image, ColorTable *colorTablePtr));
extern Colorimage Blt_ConvolveColorimage _ANSI_ARGS_((Colorimage srcImage,
Image2DFilter *filter));
extern Colorimage Blt_CreateColorimage _ANSI_ARGS_((int width, int height));
extern Colorimage Blt_DrawableToColorimage _ANSI_ARGS_((Tk_Window tkwin,
Drawable drawable, int width, int height, ImageRegion *regionPtr));
extern int Blt_FindImage1DFilter _ANSI_ARGS_((Tcl_Interp *interp,
char *filterName, Image1DFilter *filterPtr));
extern void Blt_FreeColorimage _ANSI_ARGS_((Colorimage image));
extern Colorimage Blt_PhotoToColorimage _ANSI_ARGS_((Tk_PhotoHandle photo,
ImageRegion *regionPtr));
extern Colorimage Blt_ResampleColorimage _ANSI_ARGS_((Colorimage image,
ImageRegion *srcRegionPtr, ImageRegion *destRegionPtr,
Image1DFilter horzFilter, Image1DFilter vertFilter));
extern void Blt_ResamplePhoto _ANSI_ARGS_((Tk_PhotoHandle srcPhoto,
Tk_PhotoHandle destPhoto, ImageRegion *srcRegionPtr,
Image1DFilter horzFilter, Image1DFilter vertFilter));
extern Colorimage Blt_ResizeColorimage _ANSI_ARGS_((Colorimage image,
ImageRegion *srcRegionPtr, ImageRegion *destRegionPtr));
extern Colorimage Blt_RotateColorimage _ANSI_ARGS_((Colorimage image,
double theta));
extern void Blt_ResizePhoto _ANSI_ARGS_((Tk_PhotoHandle srcPhoto,
Tk_PhotoHandle destPhoto, ImageRegion *srcRegionPtr));
extern int Blt_SnapPhoto _ANSI_ARGS_((Tcl_Interp *interp, Tk_Window tkwin,
Drawable drawable, int width, int height, int destWidth,
int destHeight, char *photoName));
extern ColorTable Blt_CreateColorTable _ANSI_ARGS_((Tk_Window tkwin));
extern ColorTable Blt_DirectColorTable _ANSI_ARGS_((Tcl_Interp *interp,
Tk_Window tkwin, Colorimage image));
extern ColorTable Blt_PseudoColorTable _ANSI_ARGS_((Tcl_Interp *interp,
Tk_Window tkwin, Colorimage image));
extern ColorTable Blt_CreateColorTable _ANSI_ARGS_((Tk_Window tkwin));
extern void Blt_FreeColorTable _ANSI_ARGS_((ColorTable colorTable));
/* Routines missing from the Tk photo C API */
extern int Blt_TkImageDeleted _ANSI_ARGS_((Tk_Image tkImage));
extern Tk_ImageMaster Blt_TkImageMaster _ANSI_ARGS_((Tk_Image tkImage));
#endif /*_BLT_IMAGE_H*/
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