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tkImgPhoto.c
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tkImgPhoto.c
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/*
* tkImgPhoto.c --
*
* Implements images of type "photo" for Tk. Photo images are
* stored in full color (24 bits per pixel) and displayed using
* dithering if necessary.
*
* Copyright (c) 1994 The Australian National University.
* Copyright (c) 1994-1997 Sun Microsystems, Inc.
*
* See the file "license.terms" for information on usage and redistribution
* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
*
* Author: Paul Mackerras (paulus@cs.anu.edu.au),
* Department of Computer Science,
* Australian National University.
*
* RCS: @(#) $Id: tkImgPhoto.c,v 1.8 1999/04/30 22:49:55 stanton Exp $
*/
#include "tkInt.h"
#include "tkPort.h"
#include "tclMath.h"
#include <ctype.h>
#ifdef __WIN32__
#include "tkWinInt.h"
#endif
/*
* Declaration for internal Xlib function used here:
*/
extern _XInitImageFuncPtrs _ANSI_ARGS_((XImage *image));
/*
* A signed 8-bit integral type. If chars are unsigned and the compiler
* isn't an ANSI one, then we have to use short instead (which wastes
* space) to get signed behavior.
*/
#if defined(__STDC__) || defined(_AIX)
typedef signed char schar;
#else
# ifndef __CHAR_UNSIGNED__
typedef char schar;
# else
typedef short schar;
# endif
#endif
/*
* An unsigned 32-bit integral type, used for pixel values.
* We use int rather than long here to accommodate those systems
* where longs are 64 bits.
*/
typedef unsigned int pixel;
/*
* The maximum number of pixels to transmit to the server in a
* single XPutImage call.
*/
#define MAX_PIXELS 65536
/*
* The set of colors required to display a photo image in a window depends on:
* - the visual used by the window
* - the palette, which specifies how many levels of each primary
* color to use, and
* - the gamma value for the image.
*
* Pixel values allocated for specific colors are valid only for the
* colormap in which they were allocated. Sets of pixel values
* allocated for displaying photos are re-used in other windows if
* possible, that is, if the display, colormap, palette and gamma
* values match. A hash table is used to locate these sets of pixel
* values, using the following data structure as key:
*/
typedef struct {
Display *display; /* Qualifies the colormap resource ID */
Colormap colormap; /* Colormap that the windows are using. */
double gamma; /* Gamma exponent value for images. */
Tk_Uid palette; /* Specifies how many shades of each primary
* we want to allocate. */
} ColorTableId;
/*
* For a particular (display, colormap, palette, gamma) combination,
* a data structure of the following type is used to store the allocated
* pixel values and other information:
*/
typedef struct ColorTable {
ColorTableId id; /* Information used in selecting this
* color table. */
int flags; /* See below. */
int refCount; /* Number of instances using this map. */
int liveRefCount; /* Number of instances which are actually
* in use, using this map. */
int numColors; /* Number of colors allocated for this map. */
XVisualInfo visualInfo; /* Information about the visual for windows
* using this color table. */
pixel redValues[256]; /* Maps 8-bit values of red intensity
* to a pixel value or index in pixelMap. */
pixel greenValues[256]; /* Ditto for green intensity */
pixel blueValues[256]; /* Ditto for blue intensity */
unsigned long *pixelMap; /* Actual pixel values allocated. */
unsigned char colorQuant[3][256];
/* Maps 8-bit intensities to quantized
* intensities. The first index is 0 for
* red, 1 for green, 2 for blue. */
} ColorTable;
/*
* Bit definitions for the flags field of a ColorTable.
* BLACK_AND_WHITE: 1 means only black and white colors are
* available.
* COLOR_WINDOW: 1 means a full 3-D color cube has been
* allocated.
* DISPOSE_PENDING: 1 means a call to DisposeColorTable has
* been scheduled as an idle handler, but it
* hasn't been invoked yet.
* MAP_COLORS: 1 means pixel values should be mapped
* through pixelMap.
*/
#ifdef COLOR_WINDOW
#undef COLOR_WINDOW
#endif
#define BLACK_AND_WHITE 1
#define COLOR_WINDOW 2
#define DISPOSE_PENDING 4
#define MAP_COLORS 8
/*
* Definition of the data associated with each photo image master.
*/
typedef struct PhotoMaster {
Tk_ImageMaster tkMaster; /* Tk's token for image master. NULL means
* the image is being deleted. */
Tcl_Interp *interp; /* Interpreter associated with the
* application using this image. */
Tcl_Command imageCmd; /* Token for image command (used to delete
* it when the image goes away). NULL means
* the image command has already been
* deleted. */
int flags; /* Sundry flags, defined below. */
int width, height; /* Dimensions of image. */
int userWidth, userHeight; /* User-declared image dimensions. */
Tk_Uid palette; /* User-specified default palette for
* instances of this image. */
double gamma; /* Display gamma value to correct for. */
char *fileString; /* Name of file to read into image. */
char *dataString; /* String value to use as contents of image. */
char *format; /* User-specified format of data in image
* file or string value. */
unsigned char *pix24; /* Local storage for 24-bit image. */
int ditherX, ditherY; /* Location of first incorrectly
* dithered pixel in image. */
TkRegion validRegion; /* Tk region indicating which parts of
* the image have valid image data. */
struct PhotoInstance *instancePtr;
/* First in the list of instances
* associated with this master. */
} PhotoMaster;
/*
* Bit definitions for the flags field of a PhotoMaster.
* COLOR_IMAGE: 1 means that the image has different color
* components.
* IMAGE_CHANGED: 1 means that the instances of this image
* need to be redithered.
*/
#define COLOR_IMAGE 1
#define IMAGE_CHANGED 2
/*
* The following data structure represents all of the instances of
* a photo image in windows on a given screen that are using the
* same colormap.
*/
typedef struct PhotoInstance {
PhotoMaster *masterPtr; /* Pointer to master for image. */
Display *display; /* Display for windows using this instance. */
Colormap colormap; /* The image may only be used in windows with
* this particular colormap. */
struct PhotoInstance *nextPtr;
/* Pointer to the next instance in the list
* of instances associated with this master. */
int refCount; /* Number of instances using this structure. */
Tk_Uid palette; /* Palette for these particular instances. */
double gamma; /* Gamma value for these instances. */
Tk_Uid defaultPalette; /* Default palette to use if a palette
* is not specified for the master. */
ColorTable *colorTablePtr; /* Pointer to information about colors
* allocated for image display in windows
* like this one. */
Pixmap pixels; /* X pixmap containing dithered image. */
int width, height; /* Dimensions of the pixmap. */
schar *error; /* Error image, used in dithering. */
XImage *imagePtr; /* Image structure for converted pixels. */
XVisualInfo visualInfo; /* Information about the visual that these
* windows are using. */
GC gc; /* Graphics context for writing images
* to the pixmap. */
} PhotoInstance;
/*
* The following data structure is used to return information
* from ParseSubcommandOptions:
*/
struct SubcommandOptions {
int options; /* Individual bits indicate which
* options were specified - see below. */
char *name; /* Name specified without an option. */
int fromX, fromY; /* Values specified for -from option. */
int fromX2, fromY2; /* Second coordinate pair for -from option. */
int toX, toY; /* Values specified for -to option. */
int toX2, toY2; /* Second coordinate pair for -to option. */
int zoomX, zoomY; /* Values specified for -zoom option. */
int subsampleX, subsampleY; /* Values specified for -subsample option. */
char *format; /* Value specified for -format option. */
};
/*
* Bit definitions for use with ParseSubcommandOptions:
* Each bit is set in the allowedOptions parameter on a call to
* ParseSubcommandOptions if that option is allowed for the current
* photo image subcommand. On return, the bit is set in the options
* field of the SubcommandOptions structure if that option was specified.
*
* OPT_FORMAT: Set if -format option allowed/specified.
* OPT_FROM: Set if -from option allowed/specified.
* OPT_SHRINK: Set if -shrink option allowed/specified.
* OPT_SUBSAMPLE: Set if -subsample option allowed/spec'd.
* OPT_TO: Set if -to option allowed/specified.
* OPT_ZOOM: Set if -zoom option allowed/specified.
*/
#define OPT_FORMAT 1
#define OPT_FROM 2
#define OPT_SHRINK 4
#define OPT_SUBSAMPLE 8
#define OPT_TO 0x10
#define OPT_ZOOM 0x20
/*
* List of option names. The order here must match the order of
* declarations of the OPT_* constants above.
*/
static char *optionNames[] = {
"-format",
"-from",
"-shrink",
"-subsample",
"-to",
"-zoom",
(char *) NULL
};
/*
* The type record for photo images:
*/
static int ImgPhotoCreate _ANSI_ARGS_((Tcl_Interp *interp,
char *name, int argc, char **argv,
Tk_ImageType *typePtr, Tk_ImageMaster master,
ClientData *clientDataPtr));
static ClientData ImgPhotoGet _ANSI_ARGS_((Tk_Window tkwin,
ClientData clientData));
static void ImgPhotoDisplay _ANSI_ARGS_((ClientData clientData,
Display *display, Drawable drawable,
int imageX, int imageY, int width, int height,
int drawableX, int drawableY));
static void ImgPhotoFree _ANSI_ARGS_((ClientData clientData,
Display *display));
static void ImgPhotoDelete _ANSI_ARGS_((ClientData clientData));
Tk_ImageType tkPhotoImageType = {
"photo", /* name */
ImgPhotoCreate, /* createProc */
ImgPhotoGet, /* getProc */
ImgPhotoDisplay, /* displayProc */
ImgPhotoFree, /* freeProc */
ImgPhotoDelete, /* deleteProc */
(Tk_ImageType *) NULL /* nextPtr */
};
typedef struct ThreadSpecificData {
Tk_PhotoImageFormat *formatList; /* Pointer to the first in the
* list of known photo image formats.*/
} ThreadSpecificData;
static Tcl_ThreadDataKey dataKey;
/*
* Default configuration
*/
#define DEF_PHOTO_GAMMA "1"
#define DEF_PHOTO_HEIGHT "0"
#define DEF_PHOTO_PALETTE ""
#define DEF_PHOTO_WIDTH "0"
/*
* Information used for parsing configuration specifications:
*/
static Tk_ConfigSpec configSpecs[] = {
{TK_CONFIG_STRING, "-data", (char *) NULL, (char *) NULL,
(char *) NULL, Tk_Offset(PhotoMaster, dataString), TK_CONFIG_NULL_OK},
{TK_CONFIG_STRING, "-format", (char *) NULL, (char *) NULL,
(char *) NULL, Tk_Offset(PhotoMaster, format), TK_CONFIG_NULL_OK},
{TK_CONFIG_STRING, "-file", (char *) NULL, (char *) NULL,
(char *) NULL, Tk_Offset(PhotoMaster, fileString), TK_CONFIG_NULL_OK},
{TK_CONFIG_DOUBLE, "-gamma", (char *) NULL, (char *) NULL,
DEF_PHOTO_GAMMA, Tk_Offset(PhotoMaster, gamma), 0},
{TK_CONFIG_INT, "-height", (char *) NULL, (char *) NULL,
DEF_PHOTO_HEIGHT, Tk_Offset(PhotoMaster, userHeight), 0},
{TK_CONFIG_UID, "-palette", (char *) NULL, (char *) NULL,
DEF_PHOTO_PALETTE, Tk_Offset(PhotoMaster, palette), 0},
{TK_CONFIG_INT, "-width", (char *) NULL, (char *) NULL,
DEF_PHOTO_WIDTH, Tk_Offset(PhotoMaster, userWidth), 0},
{TK_CONFIG_END, (char *) NULL, (char *) NULL, (char *) NULL,
(char *) NULL, 0, 0}
};
/*
* Hash table used to hash from (display, colormap, palette, gamma)
* to ColorTable address.
*/
static Tcl_HashTable imgPhotoColorHash;
static int imgPhotoColorHashInitialized;
#define N_COLOR_HASH (sizeof(ColorTableId) / sizeof(int))
/*
* Forward declarations
*/
static int ImgPhotoCmd _ANSI_ARGS_((ClientData clientData,
Tcl_Interp *interp, int argc, char **argv));
static int ParseSubcommandOptions _ANSI_ARGS_((
struct SubcommandOptions *optPtr,
Tcl_Interp *interp, int allowedOptions,
int *indexPtr, int argc, char **argv));
static void ImgPhotoCmdDeletedProc _ANSI_ARGS_((
ClientData clientData));
static int ImgPhotoConfigureMaster _ANSI_ARGS_((
Tcl_Interp *interp, PhotoMaster *masterPtr,
int argc, char **argv, int flags));
static void ImgPhotoConfigureInstance _ANSI_ARGS_((
PhotoInstance *instancePtr));
static void ImgPhotoSetSize _ANSI_ARGS_((PhotoMaster *masterPtr,
int width, int height));
static void ImgPhotoInstanceSetSize _ANSI_ARGS_((
PhotoInstance *instancePtr));
static int IsValidPalette _ANSI_ARGS_((PhotoInstance *instancePtr,
char *palette));
static int CountBits _ANSI_ARGS_((pixel mask));
static void GetColorTable _ANSI_ARGS_((PhotoInstance *instancePtr));
static void FreeColorTable _ANSI_ARGS_((ColorTable *colorPtr,
int force));
static void AllocateColors _ANSI_ARGS_((ColorTable *colorPtr));
static void DisposeColorTable _ANSI_ARGS_((ClientData clientData));
static void DisposeInstance _ANSI_ARGS_((ClientData clientData));
static int ReclaimColors _ANSI_ARGS_((ColorTableId *id,
int numColors));
static int MatchFileFormat _ANSI_ARGS_((Tcl_Interp *interp,
Tcl_Channel chan, char *fileName,
char *formatString,
Tk_PhotoImageFormat **imageFormatPtr,
int *widthPtr, int *heightPtr));
static int MatchStringFormat _ANSI_ARGS_((Tcl_Interp *interp,
char *string, char *formatString,
Tk_PhotoImageFormat **imageFormatPtr,
int *widthPtr, int *heightPtr));
static void Dither _ANSI_ARGS_((PhotoMaster *masterPtr,
int x, int y, int width, int height));
static void DitherInstance _ANSI_ARGS_((PhotoInstance *instancePtr,
int x, int y, int width, int height));
#undef MIN
#define MIN(a, b) ((a) < (b)? (a): (b))
#undef MAX
#define MAX(a, b) ((a) > (b)? (a): (b))
/*
*----------------------------------------------------------------------
*
* Tk_CreatePhotoImageFormat --
*
* This procedure is invoked by an image file handler to register
* a new photo image format and the procedures that handle the
* new format. The procedure is typically invoked during
* Tcl_AppInit.
*
* Results:
* None.
*
* Side effects:
* The new image file format is entered into a table used in the
* photo image "read" and "write" subcommands.
*
*----------------------------------------------------------------------
*/
void
Tk_CreatePhotoImageFormat(formatPtr)
Tk_PhotoImageFormat *formatPtr;
/* Structure describing the format. All of
* the fields except "nextPtr" must be filled
* in by caller. Must not have been passed
* to Tk_CreatePhotoImageFormat previously. */
{
Tk_PhotoImageFormat *copyPtr;
ThreadSpecificData *tsdPtr = (ThreadSpecificData *)
Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));
copyPtr = (Tk_PhotoImageFormat *) ckalloc(sizeof(Tk_PhotoImageFormat));
*copyPtr = *formatPtr;
copyPtr->name = (char *) ckalloc((unsigned) (strlen(formatPtr->name) + 1));
strcpy(copyPtr->name, formatPtr->name);
copyPtr->nextPtr = tsdPtr->formatList;
tsdPtr->formatList = copyPtr;
}
/*
*----------------------------------------------------------------------
*
* ImgPhotoCreate --
*
* This procedure is called by the Tk image code to create
* a new photo image.
*
* Results:
* A standard Tcl result.
*
* Side effects:
* The data structure for a new photo image is allocated and
* initialized.
*
*----------------------------------------------------------------------
*/
static int
ImgPhotoCreate(interp, name, argc, argv, typePtr, master, clientDataPtr)
Tcl_Interp *interp; /* Interpreter for application containing
* image. */
char *name; /* Name to use for image. */
int argc; /* Number of arguments. */
char **argv; /* Argument strings for options (doesn't
* include image name or type). */
Tk_ImageType *typePtr; /* Pointer to our type record (not used). */
Tk_ImageMaster master; /* Token for image, to be used by us in
* later callbacks. */
ClientData *clientDataPtr; /* Store manager's token for image here;
* it will be returned in later callbacks. */
{
PhotoMaster *masterPtr;
/*
* Allocate and initialize the photo image master record.
*/
masterPtr = (PhotoMaster *) ckalloc(sizeof(PhotoMaster));
memset((void *) masterPtr, 0, sizeof(PhotoMaster));
masterPtr->tkMaster = master;
masterPtr->interp = interp;
masterPtr->imageCmd = Tcl_CreateCommand(interp, name, ImgPhotoCmd,
(ClientData) masterPtr, ImgPhotoCmdDeletedProc);
masterPtr->palette = NULL;
masterPtr->pix24 = NULL;
masterPtr->instancePtr = NULL;
masterPtr->validRegion = TkCreateRegion();
/*
* Process configuration options given in the image create command.
*/
if (ImgPhotoConfigureMaster(interp, masterPtr, argc, argv, 0) != TCL_OK) {
ImgPhotoDelete((ClientData) masterPtr);
return TCL_ERROR;
}
*clientDataPtr = (ClientData) masterPtr;
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* ImgPhotoCmd --
*
* This procedure is invoked to process the Tcl command that
* corresponds to a photo image. See the user documentation
* for details on what it does.
*
* Results:
* A standard Tcl result.
*
* Side effects:
* See the user documentation.
*
*----------------------------------------------------------------------
*/
static int
ImgPhotoCmd(clientData, interp, argc, argv)
ClientData clientData; /* Information about photo master. */
Tcl_Interp *interp; /* Current interpreter. */
int argc; /* Number of arguments. */
char **argv; /* Argument strings. */
{
PhotoMaster *masterPtr = (PhotoMaster *) clientData;
int c, result, index;
int x, y, width, height;
int dataWidth, dataHeight;
struct SubcommandOptions options;
int listArgc;
char **listArgv;
char **srcArgv;
unsigned char *pixelPtr;
Tk_PhotoImageBlock block;
Tk_Window tkwin;
XColor color;
Tk_PhotoImageFormat *imageFormat;
int imageWidth, imageHeight;
int matched;
Tcl_Channel chan;
Tk_PhotoHandle srcHandle;
size_t length;
ThreadSpecificData *tsdPtr = (ThreadSpecificData *)
Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));
if (argc < 2) {
Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
" option ?arg arg ...?\"", (char *) NULL);
return TCL_ERROR;
}
c = argv[1][0];
length = strlen(argv[1]);
if ((c == 'b') && (strncmp(argv[1], "blank", length) == 0)) {
/*
* photo blank command - just call Tk_PhotoBlank.
*/
if (argc == 2) {
Tk_PhotoBlank(masterPtr);
} else {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " blank\"", (char *) NULL);
return TCL_ERROR;
}
} else if ((c == 'c') && (length >= 2)
&& (strncmp(argv[1], "cget", length) == 0)) {
if (argc != 3) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " cget option\"",
(char *) NULL);
return TCL_ERROR;
}
Tk_ConfigureValue(interp, Tk_MainWindow(interp), configSpecs,
(char *) masterPtr, argv[2], 0);
} else if ((c == 'c') && (length >= 3)
&& (strncmp(argv[1], "configure", length) == 0)) {
/*
* photo configure command - handle this in the standard way.
*/
if (argc == 2) {
return Tk_ConfigureInfo(interp, Tk_MainWindow(interp),
configSpecs, (char *) masterPtr, (char *) NULL, 0);
}
if (argc == 3) {
return Tk_ConfigureInfo(interp, Tk_MainWindow(interp),
configSpecs, (char *) masterPtr, argv[2], 0);
}
return ImgPhotoConfigureMaster(interp, masterPtr, argc-2, argv+2,
TK_CONFIG_ARGV_ONLY);
} else if ((c == 'c') && (length >= 3)
&& (strncmp(argv[1], "copy", length) == 0)) {
/*
* photo copy command - first parse options.
*/
index = 2;
memset((VOID *) &options, 0, sizeof(options));
options.zoomX = options.zoomY = 1;
options.subsampleX = options.subsampleY = 1;
options.name = NULL;
if (ParseSubcommandOptions(&options, interp,
OPT_FROM | OPT_TO | OPT_ZOOM | OPT_SUBSAMPLE | OPT_SHRINK,
&index, argc, argv) != TCL_OK) {
return TCL_ERROR;
}
if (options.name == NULL || index < argc) {
Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
" copy source-image ?-from x1 y1 x2 y2?",
" ?-to x1 y1 x2 y2? ?-zoom x y? ?-subsample x y?",
"\"", (char *) NULL);
return TCL_ERROR;
}
/*
* Look for the source image and get a pointer to its image data.
* Check the values given for the -from option.
*/
if ((srcHandle = Tk_FindPhoto(interp, options.name)) == NULL) {
Tcl_AppendResult(interp, "image \"", argv[2], "\" doesn't",
" exist or is not a photo image", (char *) NULL);
return TCL_ERROR;
}
Tk_PhotoGetImage(srcHandle, &block);
if ((options.fromX2 > block.width) || (options.fromY2 > block.height)
|| (options.fromX2 > block.width)
|| (options.fromY2 > block.height)) {
Tcl_AppendResult(interp, "coordinates for -from option extend ",
"outside source image", (char *) NULL);
return TCL_ERROR;
}
/*
* Fill in default values for unspecified parameters.
*/
if (((options.options & OPT_FROM) == 0) || (options.fromX2 < 0)) {
options.fromX2 = block.width;
options.fromY2 = block.height;
}
if (((options.options & OPT_TO) == 0) || (options.toX2 < 0)) {
width = options.fromX2 - options.fromX;
if (options.subsampleX > 0) {
width = (width + options.subsampleX - 1) / options.subsampleX;
} else if (options.subsampleX == 0) {
width = 0;
} else {
width = (width - options.subsampleX - 1) / -options.subsampleX;
}
options.toX2 = options.toX + width * options.zoomX;
height = options.fromY2 - options.fromY;
if (options.subsampleY > 0) {
height = (height + options.subsampleY - 1)
/ options.subsampleY;
} else if (options.subsampleY == 0) {
height = 0;
} else {
height = (height - options.subsampleY - 1)
/ -options.subsampleY;
}
options.toY2 = options.toY + height * options.zoomY;
}
/*
* Set the destination image size if the -shrink option was specified.
*/
if (options.options & OPT_SHRINK) {
ImgPhotoSetSize(masterPtr, options.toX2, options.toY2);
}
/*
* Copy the image data over using Tk_PhotoPutZoomedBlock.
*/
block.pixelPtr += options.fromX * block.pixelSize
+ options.fromY * block.pitch;
block.width = options.fromX2 - options.fromX;
block.height = options.fromY2 - options.fromY;
Tk_PhotoPutZoomedBlock((Tk_PhotoHandle) masterPtr, &block,
options.toX, options.toY, options.toX2 - options.toX,
options.toY2 - options.toY, options.zoomX, options.zoomY,
options.subsampleX, options.subsampleY);
} else if ((c == 'g') && (strncmp(argv[1], "get", length) == 0)) {
/*
* photo get command - first parse and check parameters.
*/
char string[TCL_INTEGER_SPACE * 3];
if (argc != 4) {
Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
" get x y\"", (char *) NULL);
return TCL_ERROR;
}
if ((Tcl_GetInt(interp, argv[2], &x) != TCL_OK)
|| (Tcl_GetInt(interp, argv[3], &y) != TCL_OK)) {
return TCL_ERROR;
}
if ((x < 0) || (x >= masterPtr->width)
|| (y < 0) || (y >= masterPtr->height)) {
Tcl_AppendResult(interp, argv[0], " get: ",
"coordinates out of range", (char *) NULL);
return TCL_ERROR;
}
/*
* Extract the value of the desired pixel and format it as a string.
*/
pixelPtr = masterPtr->pix24 + (y * masterPtr->width + x) * 3;
sprintf(string, "%d %d %d", pixelPtr[0], pixelPtr[1],
pixelPtr[2]);
Tcl_AppendResult(interp, string, (char *) NULL);
} else if ((c == 'p') && (strncmp(argv[1], "put", length) == 0)) {
/*
* photo put command - first parse the options and colors specified.
*/
index = 2;
memset((VOID *) &options, 0, sizeof(options));
options.name = NULL;
if (ParseSubcommandOptions(&options, interp, OPT_TO,
&index, argc, argv) != TCL_OK) {
return TCL_ERROR;
}
if ((options.name == NULL) || (index < argc)) {
Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
" put {{colors...}...} ?-to x1 y1 x2 y2?\"",
(char *) NULL);
return TCL_ERROR;
}
if (Tcl_SplitList(interp, options.name, &dataHeight, &srcArgv)
!= TCL_OK) {
return TCL_ERROR;
}
tkwin = Tk_MainWindow(interp);
block.pixelPtr = NULL;
dataWidth = 0;
pixelPtr = NULL;
for (y = 0; y < dataHeight; ++y) {
if (Tcl_SplitList(interp, srcArgv[y], &listArgc, &listArgv)
!= TCL_OK) {
break;
}
if (y == 0) {
dataWidth = listArgc;
pixelPtr = (unsigned char *) ckalloc((unsigned)
dataWidth * dataHeight * 3);
block.pixelPtr = pixelPtr;
} else {
if (listArgc != dataWidth) {
Tcl_AppendResult(interp, "all elements of color list must",
" have the same number of elements",
(char *) NULL);
ckfree((char *) listArgv);
break;
}
}
for (x = 0; x < dataWidth; ++x) {
if (!XParseColor(Tk_Display(tkwin), Tk_Colormap(tkwin),
listArgv[x], &color)) {
Tcl_AppendResult(interp, "can't parse color \"",
listArgv[x], "\"", (char *) NULL);
break;
}
*pixelPtr++ = color.red >> 8;
*pixelPtr++ = color.green >> 8;
*pixelPtr++ = color.blue >> 8;
}
ckfree((char *) listArgv);
if (x < dataWidth)
break;
}
ckfree((char *) srcArgv);
if (y < dataHeight || dataHeight == 0 || dataWidth == 0) {
if (block.pixelPtr != NULL) {
ckfree((char *) block.pixelPtr);
}
if (y < dataHeight) {
return TCL_ERROR;
}
return TCL_OK;
}
/*
* Fill in default values for the -to option, then
* copy the block in using Tk_PhotoPutBlock.
*/
if (((options.options & OPT_TO) == 0) || (options.toX2 < 0)) {
options.toX2 = options.toX + dataWidth;
options.toY2 = options.toY + dataHeight;
}
block.width = dataWidth;
block.height = dataHeight;
block.pitch = dataWidth * 3;
block.pixelSize = 3;
block.offset[0] = 0;
block.offset[1] = 1;
block.offset[2] = 2;
Tk_PhotoPutBlock((ClientData)masterPtr, &block,
options.toX, options.toY, options.toX2 - options.toX,
options.toY2 - options.toY);
ckfree((char *) block.pixelPtr);
} else if ((c == 'r') && (length >= 3)
&& (strncmp(argv[1], "read", length) == 0)) {
/*
* photo read command - first parse the options specified.
*/
index = 2;
memset((VOID *) &options, 0, sizeof(options));
options.name = NULL;
options.format = NULL;
if (ParseSubcommandOptions(&options, interp,
OPT_FORMAT | OPT_FROM | OPT_TO | OPT_SHRINK,
&index, argc, argv) != TCL_OK) {
return TCL_ERROR;
}
if ((options.name == NULL) || (index < argc)) {
Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
" read fileName ?-format format-name?",
" ?-from x1 y1 x2 y2? ?-to x y? ?-shrink?\"",
(char *) NULL);
return TCL_ERROR;
}
/*
* Prevent file system access in safe interpreters.
*/
if (Tcl_IsSafe(interp)) {
Tcl_AppendResult(interp, "can't get image from a file in a",
" safe interpreter", (char *) NULL);
return TCL_ERROR;
}
/*
* Open the image file and look for a handler for it.
*/
chan = Tcl_OpenFileChannel(interp, options.name, "r", 0);
if (chan == NULL) {
return TCL_ERROR;
}
if (Tcl_SetChannelOption(interp, chan, "-translation", "binary")
!= TCL_OK) {
return TCL_ERROR;
}
if (Tcl_SetChannelOption(interp, chan, "-encoding", "binary")
!= TCL_OK) {
return TCL_ERROR;
}
if (MatchFileFormat(interp, chan, options.name, options.format,
&imageFormat, &imageWidth, &imageHeight) != TCL_OK) {
Tcl_Close(NULL, chan);
return TCL_ERROR;
}
/*
* Check the values given for the -from option.
*/
if ((options.fromX > imageWidth) || (options.fromY > imageHeight)
|| (options.fromX2 > imageWidth)
|| (options.fromY2 > imageHeight)) {
Tcl_AppendResult(interp, "coordinates for -from option extend ",
"outside source image", (char *) NULL);
Tcl_Close(NULL, chan);
return TCL_ERROR;
}
if (((options.options & OPT_FROM) == 0) || (options.fromX2 < 0)) {
width = imageWidth - options.fromX;
height = imageHeight - options.fromY;
} else {
width = options.fromX2 - options.fromX;
height = options.fromY2 - options.fromY;
}
/*
* If the -shrink option was specified, set the size of the image.
*/
if (options.options & OPT_SHRINK) {
ImgPhotoSetSize(masterPtr, options.toX + width,
options.toY + height);
}
/*
* Call the handler's file read procedure to read the data
* into the image.
*/
result = (*imageFormat->fileReadProc)(interp, chan, options.name,
options.format, (Tk_PhotoHandle) masterPtr, options.toX,
options.toY, width, height, options.fromX, options.fromY);
if (chan != NULL) {
Tcl_Close(NULL, chan);
}
return result;
} else if ((c == 'r') && (length >= 3)
&& (strncmp(argv[1], "redither", length) == 0)) {
if (argc == 2) {
/*
* Call Dither if any part of the image is not correctly
* dithered at present.
*/
x = masterPtr->ditherX;
y = masterPtr->ditherY;
if (masterPtr->ditherX != 0) {
Dither(masterPtr, x, y, masterPtr->width - x, 1);
}
if (masterPtr->ditherY < masterPtr->height) {
x = 0;
Dither(masterPtr, 0, masterPtr->ditherY, masterPtr->width,
masterPtr->height - masterPtr->ditherY);
}
if (y < masterPtr->height) {
/*
* Tell the core image code that part of the image has changed.
*/
Tk_ImageChanged(masterPtr->tkMaster, x, y,
(masterPtr->width - x), (masterPtr->height - y),
masterPtr->width, masterPtr->height);
}
} else {
Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
" redither\"", (char *) NULL);
return TCL_ERROR;
}
} else if ((c == 'w') && (strncmp(argv[1], "write", length) == 0)) {
/*
* Prevent file system access in safe interpreters.
*/
if (Tcl_IsSafe(interp)) {
Tcl_AppendResult(interp, "can't write image to a file in a",
" safe interpreter", (char *) NULL);
return TCL_ERROR;
}
/*
* photo write command - first parse and check any options given.
*/
index = 2;
memset((VOID *) &options, 0, sizeof(options));
options.name = NULL;
options.format = NULL;
if (ParseSubcommandOptions(&options, interp, OPT_FORMAT | OPT_FROM,
&index, argc, argv) != TCL_OK) {
return TCL_ERROR;
}
if ((options.name == NULL) || (index < argc)) {
Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
" write fileName ?-format format-name?",
"?-from x1 y1 x2 y2?\"", (char *) NULL);
return TCL_ERROR;
}
if ((options.fromX > masterPtr->width)
|| (options.fromY > masterPtr->height)
|| (options.fromX2 > masterPtr->width)
|| (options.fromY2 > masterPtr->height)) {
Tcl_AppendResult(interp, "coordinates for -from option extend ",
"outside image", (char *) NULL);
return TCL_ERROR;
}
/*
* Fill in default values for unspecified parameters.
*/
if (((options.options & OPT_FROM) == 0) || (options.fromX2 < 0)) {
options.fromX2 = masterPtr->width;
options.fromY2 = masterPtr->height;
}
/*
* Search for an appropriate image file format handler,
* and give an error if none is found.
*/
matched = 0;
for (imageFormat = tsdPtr->formatList; imageFormat != NULL;
imageFormat = imageFormat->nextPtr) {
if ((options.format == NULL)
|| (strncasecmp(options.format, imageFormat->name,
strlen(imageFormat->name)) == 0)) {
matched = 1;