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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 (32 bits per pixel including alpha channel) and displayed
* using dithering if necessary.
*
* Copyright (c) 1994 The Australian National University.
* Copyright (c) 1994-1997 Sun Microsystems, Inc.
* Copyright (c) 2002-2003 Donal K. Fellows
* Copyright (c) 2003 ActiveState Corporation.
*
* 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.
*/
#include "tkInt.h"
#include <ctype.h>
#ifdef __WIN32__
#include "tkWinInt.h"
#elif defined(__CYGWIN__)
#include "tkUnixInt.h"
#endif
/*
* Declaration for internal Xlib function used here:
*/
extern int _XInitImageFuncPtrs(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. */
Tcl_Obj *dataString; /* Object to use as contents of image. */
Tcl_Obj *format; /* User-specified format of data in image file
* or string value. */
unsigned char *pix32; /* Local storage for 32-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.
* COMPLEX_ALPHA: 1 means that the instances of this image have
* alpha values that aren't 0 or 255, and so need
* the copy-merge-replace renderer .
*/
#define COLOR_IMAGE 1
#define IMAGE_CHANGED 2
#define COMPLEX_ALPHA 4
/*
* Flag to OR with the compositing rule to indicate that the source, despite
* having an alpha channel, has simple alpha.
*/
#define SOURCE_IS_SIMPLE_ALPHA_PHOTO 0x10000000
/*
* 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. */
Tcl_Obj *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. */
Tcl_Obj *format; /* Value specified for -format option. */
XColor *background; /* Value specified for -background option. */
int compositingRule; /* Value specified for -compositingrule
* 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_BACKGROUND: Set if -format option allowed/specified.
* OPT_COMPOSITE: Set if -compositingrule option allowed/spec'd.
* OPT_FORMAT: Set if -format option allowed/specified.
* OPT_FROM: Set if -from option allowed/specified.
* OPT_GRAYSCALE: Set if -grayscale 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_BACKGROUND 1
#define OPT_COMPOSITE 2
#define OPT_FORMAT 4
#define OPT_FROM 8
#define OPT_GRAYSCALE 0x10
#define OPT_SHRINK 0x20
#define OPT_SUBSAMPLE 0x40
#define OPT_TO 0x80
#define OPT_ZOOM 0x100
/*
* List of option names. The order here must match the order of declarations
* of the OPT_* constants above.
*/
static const char *const optionNames[] = {
"-background",
"-compositingrule",
"-format",
"-from",
"-grayscale",
"-shrink",
"-subsample",
"-to",
"-zoom",
NULL
};
/*
* Message to generate when an attempt to resize an image fails due to memory
* problems.
*/
#define TK_PHOTO_ALLOC_FAILURE_MESSAGE \
"not enough free memory for image buffer"
/*
* Functions used in the type record for photo images.
*/
static int ImgPhotoCreate(Tcl_Interp *interp, char *name,
int objc, Tcl_Obj *CONST objv[],
Tk_ImageType *typePtr, Tk_ImageMaster master,
ClientData *clientDataPtr);
static ClientData ImgPhotoGet(Tk_Window tkwin, ClientData clientData);
static void ImgPhotoDisplay(ClientData clientData,
Display *display, Drawable drawable,
int imageX, int imageY, int width, int height,
int drawableX, int drawableY);
static void ImgPhotoFree(ClientData clientData, Display *display);
static void ImgPhotoDelete(ClientData clientData);
static int ImgPhotoPostscript(ClientData clientData,
Tcl_Interp *interp, Tk_Window tkwin,
Tk_PostscriptInfo psInfo, int x, int y, int width,
int height, int prepass);
/*
* The type record itself for photo images:
*/
Tk_ImageType tkPhotoImageType = {
"photo", /* name */
ImgPhotoCreate, /* createProc */
ImgPhotoGet, /* getProc */
ImgPhotoDisplay, /* displayProc */
ImgPhotoFree, /* freeProc */
ImgPhotoDelete, /* deleteProc */
ImgPhotoPostscript, /* postscriptProc */
NULL /* nextPtr */
};
typedef struct ThreadSpecificData {
Tk_PhotoImageFormat *formatList;
/* Pointer to the first in the list of known
* photo image formats.*/
Tk_PhotoImageFormat *oldFormatList;
/* Pointer to the first in the list of known
* photo image formats.*/
int initialized; /* Set to 1 if we've initialized the
* strucuture. */
} 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, "-file", NULL, NULL,
NULL, Tk_Offset(PhotoMaster, fileString), TK_CONFIG_NULL_OK},
{TK_CONFIG_DOUBLE, "-gamma", NULL, NULL,
DEF_PHOTO_GAMMA, Tk_Offset(PhotoMaster, gamma), 0},
{TK_CONFIG_INT, "-height", NULL, NULL,
DEF_PHOTO_HEIGHT, Tk_Offset(PhotoMaster, userHeight), 0},
{TK_CONFIG_UID, "-palette", NULL, NULL,
DEF_PHOTO_PALETTE, Tk_Offset(PhotoMaster, palette), 0},
{TK_CONFIG_INT, "-width", NULL, NULL,
DEF_PHOTO_WIDTH, Tk_Offset(PhotoMaster, userWidth), 0},
{TK_CONFIG_END, NULL, NULL, NULL, 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))
/*
* Implementation of the Porter-Duff Source-Over compositing rule.
*/
#define PD_SRC_OVER(srcColor,srcAlpha,dstColor,dstAlpha) \
(srcColor*srcAlpha/255) + dstAlpha*(255-srcAlpha)/255*dstColor/255
#define PD_SRC_OVER_ALPHA(srcAlpha,dstAlpha) \
(srcAlpha + (255-srcAlpha)*dstAlpha/255)
/*
* Forward declarations
*/
static void PhotoFormatThreadExitProc(ClientData clientData);
static int ImgPhotoCmd(ClientData clientData, Tcl_Interp *interp,
int objc, Tcl_Obj *CONST objv[]);
static int ParseSubcommandOptions(
struct SubcommandOptions *optPtr,
Tcl_Interp *interp, int allowedOptions,
int *indexPtr, int objc, Tcl_Obj *const objv[]);
static void ImgPhotoCmdDeletedProc(ClientData clientData);
static int ImgPhotoConfigureMaster(Tcl_Interp *interp,
PhotoMaster *masterPtr, int objc,
Tcl_Obj *const objv[], int flags);
static void ImgPhotoConfigureInstance(PhotoInstance *instancePtr);
static int ToggleComplexAlphaIfNeeded(PhotoMaster *mPtr);
static void ImgPhotoBlendComplexAlpha(XImage *bgImg,
PhotoInstance *iPtr, int xOffset, int yOffset,
int width, int height);
static int ImgPhotoSetSize(PhotoMaster *masterPtr, int width,
int height);
static void ImgPhotoInstanceSetSize(PhotoInstance *instancePtr);
static int ImgStringWrite(Tcl_Interp *interp,
Tcl_Obj *formatString,
Tk_PhotoImageBlock *blockPtr);
static char * ImgGetPhoto(PhotoMaster *masterPtr,
Tk_PhotoImageBlock *blockPtr,
struct SubcommandOptions *optPtr);
static int IsValidPalette(PhotoInstance *instancePtr,
const char *palette);
static int CountBits(pixel mask);
static void GetColorTable(PhotoInstance *instancePtr);
static void FreeColorTable(ColorTable *colorPtr, int force);
static void AllocateColors(ColorTable *colorPtr);
static void DisposeColorTable(ClientData clientData);
static void DisposeInstance(ClientData clientData);
static int ReclaimColors(ColorTableId *id, int numColors);
static int MatchFileFormat(Tcl_Interp *interp, Tcl_Channel chan,
char *fileName, Tcl_Obj *formatString,
Tk_PhotoImageFormat **imageFormatPtr,
int *widthPtr, int *heightPtr, int *oldformat);
static int MatchStringFormat(Tcl_Interp *interp, Tcl_Obj *data,
Tcl_Obj *formatString,
Tk_PhotoImageFormat **imageFormatPtr,
int *widthPtr, int *heightPtr, int *oldformat);
static Tcl_ObjCmdProc * PhotoOptionFind(Tcl_Interp *interp, Tcl_Obj *obj);
static void DitherInstance(PhotoInstance *instancePtr, int x,
int y, int width, int height);
static void PhotoOptionCleanupProc(ClientData clientData,
Tcl_Interp *interp);
#undef MIN
#define MIN(a, b) ((a) < (b)? (a): (b))
#undef MAX
#define MAX(a, b) ((a) > (b)? (a): (b))
/*
*----------------------------------------------------------------------
*
* PhotoFormatThreadExitProc --
*
* Clean up the registered list of photo formats.
*
* Results:
* None.
*
* Side effects:
* The thread's linked lists of photo image formats is deleted.
*
*----------------------------------------------------------------------
*/
static void
PhotoFormatThreadExitProc(
ClientData clientData) /* not used */
{
Tk_PhotoImageFormat *freePtr;
ThreadSpecificData *tsdPtr = (ThreadSpecificData *)
Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));
while (tsdPtr->oldFormatList != NULL) {
freePtr = tsdPtr->oldFormatList;
tsdPtr->oldFormatList = tsdPtr->oldFormatList->nextPtr;
ckfree((char *) freePtr);
}
while (tsdPtr->formatList != NULL) {
freePtr = tsdPtr->formatList;
tsdPtr->formatList = tsdPtr->formatList->nextPtr;
ckfree((char *) freePtr->name);
ckfree((char *) freePtr);
}
}
/*
*----------------------------------------------------------------------
*
* Tk_CreateOldPhotoImageFormat, Tk_CreatePhotoImageFormat --
*
* This function is invoked by an image file handler to register a new
* photo image format and the functions that handle the new format. The
* function 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_CreateOldPhotoImageFormat(
Tk_PhotoImageFormat *formatPtr)
/* Structure describing the format. All of the
* fields except "nextPtr" must be filled in
* by caller. */
{
Tk_PhotoImageFormat *copyPtr;
ThreadSpecificData *tsdPtr = (ThreadSpecificData *)
Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));
if (!tsdPtr->initialized) {
tsdPtr->initialized = 1;
Tcl_CreateThreadExitHandler(PhotoFormatThreadExitProc, NULL);
}
copyPtr = (Tk_PhotoImageFormat *) ckalloc(sizeof(Tk_PhotoImageFormat));
*copyPtr = *formatPtr;
copyPtr->nextPtr = tsdPtr->oldFormatList;
tsdPtr->oldFormatList = copyPtr;
}
void
Tk_CreatePhotoImageFormat(
Tk_PhotoImageFormat *formatPtr)
/* Structure describing the format. All of the
* fields except "nextPtr" must be filled in
* by caller. */
{
Tk_PhotoImageFormat *copyPtr;
ThreadSpecificData *tsdPtr = (ThreadSpecificData *)
Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));
if (!tsdPtr->initialized) {
tsdPtr->initialized = 1;
Tcl_CreateThreadExitHandler(PhotoFormatThreadExitProc, NULL);
}
copyPtr = (Tk_PhotoImageFormat *) ckalloc(sizeof(Tk_PhotoImageFormat));
*copyPtr = *formatPtr;
if (isupper((unsigned char) *formatPtr->name)) {
copyPtr->nextPtr = tsdPtr->oldFormatList;
tsdPtr->oldFormatList = copyPtr;
} else {
/* for compatibility with aMSN: make a copy of formatPtr->name */
char *name = ckalloc(strlen(formatPtr->name) + 1);
strcpy(name, formatPtr->name);
copyPtr->name = name;
copyPtr->nextPtr = tsdPtr->formatList;
tsdPtr->formatList = copyPtr;
}
}
/*
*----------------------------------------------------------------------
*
* ImgPhotoCreate --
*
* This function 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(
Tcl_Interp *interp, /* Interpreter for application containing
* image. */
char *name, /* Name to use for image. */
int objc, /* Number of arguments. */
Tcl_Obj *CONST objv[], /* Argument objects 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(masterPtr, 0, sizeof(PhotoMaster));
masterPtr->tkMaster = master;
masterPtr->interp = interp;
masterPtr->imageCmd = Tcl_CreateObjCommand(interp, name, ImgPhotoCmd,
(ClientData) masterPtr, ImgPhotoCmdDeletedProc);
masterPtr->palette = NULL;
masterPtr->pix32 = NULL;
masterPtr->instancePtr = NULL;
masterPtr->validRegion = TkCreateRegion();
/*
* Process configuration options given in the image create command.
*/
if (ImgPhotoConfigureMaster(interp, masterPtr, objc, objv, 0) != TCL_OK) {
ImgPhotoDelete((ClientData) masterPtr);
return TCL_ERROR;
}
*clientDataPtr = (ClientData) masterPtr;
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* ImgPhotoCmd --
*
* This function 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 clientData, /* Information about photo master. */
Tcl_Interp *interp, /* Current interpreter. */
int objc, /* Number of arguments. */
Tcl_Obj *CONST objv[]) /* Argument objects. */
{
static const char *photoOptions[] = {
"blank", "cget", "configure", "copy", "data", "get", "put",
"read", "redither", "transparency", "write", NULL
};
enum PhotoOptions {
PHOTO_BLANK, PHOTO_CGET, PHOTO_CONFIGURE, PHOTO_COPY, PHOTO_DATA,
PHOTO_GET, PHOTO_PUT, PHOTO_READ, PHOTO_REDITHER, PHOTO_TRANS,
PHOTO_WRITE
};
PhotoMaster *masterPtr = (PhotoMaster *) clientData;
int result, index, x, y, width, height, dataWidth, dataHeight, listObjc;
struct SubcommandOptions options;
Tcl_Obj **listObjv, **srcObjv;
unsigned char *pixelPtr;
Tk_PhotoImageBlock block;
Tk_Window tkwin;
Tk_PhotoImageFormat *imageFormat;
int imageWidth, imageHeight, matched, length, oldformat = 0;
Tcl_Channel chan;
Tk_PhotoHandle srcHandle;
ThreadSpecificData *tsdPtr = (ThreadSpecificData *)
Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));
if (objc < 2) {
Tcl_WrongNumArgs(interp, 1, objv, "option ?arg arg ...?");
return TCL_ERROR;
}
if (Tcl_GetIndexFromObj(interp, objv[1], photoOptions, "option", 0,
&index) != TCL_OK) {
Tcl_ObjCmdProc *proc;
proc = PhotoOptionFind(interp, objv[1]);
if (proc == NULL) {
return TCL_ERROR;
}
return proc(clientData, interp, objc, objv);
}
switch ((enum PhotoOptions) index) {
case PHOTO_BLANK:
/*
* photo blank command - just call Tk_PhotoBlank.
*/
if (objc == 2) {
Tk_PhotoBlank(masterPtr);
return TCL_OK;
} else {
Tcl_WrongNumArgs(interp, 2, objv, NULL);
return TCL_ERROR;
}
case PHOTO_CGET: {
char *arg;
if (objc != 3) {
Tcl_WrongNumArgs(interp, 2, objv, "option");
return TCL_ERROR;
}
arg = Tcl_GetStringFromObj(objv[2], &length);
if (strncmp(arg,"-data", (unsigned) length) == 0) {
if (masterPtr->dataString) {
Tcl_SetObjResult(interp, masterPtr->dataString);
}
} else if (strncmp(arg,"-format", (unsigned) length) == 0) {
if (masterPtr->format) {
Tcl_SetObjResult(interp, masterPtr->format);
}
} else {
Tk_ConfigureValue(interp, Tk_MainWindow(interp), configSpecs,
(char *) masterPtr, Tcl_GetString(objv[2]), 0);
}
return TCL_OK;
}
case PHOTO_CONFIGURE:
/*
* photo configure command - handle this in the standard way.
*/
if (objc == 2) {
Tcl_Obj *obj, *subobj;
result = Tk_ConfigureInfo(interp, Tk_MainWindow(interp),
configSpecs, (char *) masterPtr, NULL, 0);
if (result != TCL_OK) {
return result;
}
obj = Tcl_NewObj();
subobj = Tcl_NewStringObj("-data {} {} {}", 14);
if (masterPtr->dataString) {
Tcl_ListObjAppendElement(NULL, subobj, masterPtr->dataString);
} else {
Tcl_AppendStringsToObj(subobj, " {}", NULL);
}
Tcl_ListObjAppendElement(interp, obj, subobj);
subobj = Tcl_NewStringObj("-format {} {} {}", 16);
if (masterPtr->format) {
Tcl_ListObjAppendElement(NULL, subobj, masterPtr->format);
} else {
Tcl_AppendStringsToObj(subobj, " {}", NULL);
}
Tcl_ListObjAppendElement(interp, obj, subobj);
Tcl_ListObjAppendList(interp, obj, Tcl_GetObjResult(interp));
Tcl_SetObjResult(interp, obj);
return TCL_OK;
} else if (objc == 3) {
char *arg = Tcl_GetStringFromObj(objv[2], &length);
if (length > 1 && !strncmp(arg, "-data", (unsigned) length)) {
Tcl_AppendResult(interp, "-data {} {} {}", NULL);
if (masterPtr->dataString) {
Tcl_ListObjAppendElement(interp, Tcl_GetObjResult(interp),
masterPtr->dataString);
} else {
Tcl_AppendResult(interp, " {}", NULL);
}
return TCL_OK;
} else if (length > 1 &&
!strncmp(arg, "-format", (unsigned) length)) {
Tcl_AppendResult(interp, "-format {} {} {}", NULL);
if (masterPtr->format) {
Tcl_ListObjAppendElement(interp, Tcl_GetObjResult(interp),
masterPtr->format);
} else {
Tcl_AppendResult(interp, " {}", NULL);
}
return TCL_OK;
} else {
return Tk_ConfigureInfo(interp, Tk_MainWindow(interp),
configSpecs, (char *) masterPtr, arg, 0);
}
}
return ImgPhotoConfigureMaster(interp, masterPtr, objc-2, objv+2,
TK_CONFIG_ARGV_ONLY);
case PHOTO_COPY:
/*
* photo copy command - first parse options.
*/
index = 2;
memset(&options, 0, sizeof(options));
options.zoomX = options.zoomY = 1;
options.subsampleX = options.subsampleY = 1;
options.name = NULL;
options.compositingRule = TK_PHOTO_COMPOSITE_OVERLAY;
if (ParseSubcommandOptions(&options, interp,
OPT_FROM | OPT_TO | OPT_ZOOM | OPT_SUBSAMPLE | OPT_SHRINK |
OPT_COMPOSITE, &index, objc, objv) != TCL_OK) {
return TCL_ERROR;
}
if (options.name == NULL || index < objc) {
Tcl_WrongNumArgs(interp, 2, objv,
"source-image ?-compositingrule rule? ?-from x1 y1 x2 y2? ?-to x1 y1 x2 y2? ?-zoom x y? ?-subsample x y?");
return TCL_ERROR;
}
/*
* Look for the source image and get a pointer to its image data.
* Check the values given for the -from option.
*/
srcHandle = Tk_FindPhoto(interp, Tcl_GetString(options.name));
if (srcHandle == NULL) {
Tcl_AppendResult(interp, "image \"",
Tcl_GetString(options.name), "\" doesn't",
" exist or is not a photo image", 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", NULL);
return TCL_ERROR;
}
/*
* Hack to pass through the message that the place we're coming from
* has a simple alpha channel.
*/
if (!(((PhotoMaster *) srcHandle)->flags & COMPLEX_ALPHA)) {
options.compositingRule |= SOURCE_IS_SIMPLE_ALPHA_PHOTO;
}
/*
* Fill in default values for unspecified parameters.
*/
if (!(options.options & OPT_FROM) || (options.fromX2 < 0)) {
options.fromX2 = block.width;
options.fromY2 = block.height;
}
if (!(options.options & OPT_TO) || (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) {
if (ImgPhotoSetSize(masterPtr, options.toX2,
options.toY2) != TCL_OK) {
Tcl_ResetResult(interp);
Tcl_AppendResult(interp, TK_PHOTO_ALLOC_FAILURE_MESSAGE, NULL);
return TCL_ERROR;
}
}
/*
* 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;
return Tk_PhotoPutZoomedBlock(interp, (Tk_PhotoHandle) masterPtr,
&block, options.toX, options.toY, options.toX2 - options.toX,
options.toY2 - options.toY, options.zoomX, options.zoomY,
options.subsampleX, options.subsampleY,
options.compositingRule);
case PHOTO_DATA: {
char *data;
/*
* photo data command - first parse and check any options given.
*/
Tk_ImageStringWriteProc *stringWriteProc = NULL;
index = 2;
memset(&options, 0, sizeof(options));
options.name = NULL;
options.format = NULL;
options.fromX = 0;
options.fromY = 0;
if (ParseSubcommandOptions(&options, interp,
OPT_FORMAT | OPT_FROM | OPT_GRAYSCALE | OPT_BACKGROUND,
&index, objc, objv) != TCL_OK) {
return TCL_ERROR;
}
if ((options.name != NULL) || (index < objc)) {
Tcl_WrongNumArgs(interp, 2, objv, "?options?");
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", 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 string format handler.
*/
if (options.options & OPT_FORMAT) {
matched = 0;
for (imageFormat = tsdPtr->formatList; imageFormat != NULL;
imageFormat = imageFormat->nextPtr) {
if ((strncasecmp(Tcl_GetString(options.format),
imageFormat->name, strlen(imageFormat->name)) == 0)) {
matched = 1;
if (imageFormat->stringWriteProc != NULL) {
stringWriteProc = imageFormat->stringWriteProc;
break;
}
}
}
if (stringWriteProc == NULL) {
oldformat = 1;
for (imageFormat = tsdPtr->oldFormatList; imageFormat != NULL;
imageFormat = imageFormat->nextPtr) {
if ((strncasecmp(Tcl_GetString(options.format),
imageFormat->name,
strlen(imageFormat->name)) == 0)) {
matched = 1;
if (imageFormat->stringWriteProc != NULL) {
stringWriteProc = imageFormat->stringWriteProc;
break;
}
}
}
}
if (stringWriteProc == NULL) {
Tcl_AppendResult(interp, "image string format \"",
Tcl_GetString(options.format), "\" is ",
(matched ? "not supported" : "unknown"), NULL);
return TCL_ERROR;
}
} else {
stringWriteProc = ImgStringWrite;
}
/*
* Call the handler's string write function to write out the image.
*/
data = ImgGetPhoto(masterPtr, &block, &options);
if (oldformat) {
Tcl_DString buffer;
Tcl_DStringInit(&buffer);
result = ((int (*) (Tcl_Interp *interp,
Tcl_DString *dataPtr, char *formatString,
Tk_PhotoImageBlock *blockPtr)) stringWriteProc)
(interp, &buffer, Tcl_GetString(options.format), &block);
if (result == TCL_OK) {
Tcl_DStringResult(interp, &buffer);
} else {
Tcl_DStringFree(&buffer);
}
} else {
result = ((int (*) (Tcl_Interp *interp,
Tcl_Obj *formatString, Tk_PhotoImageBlock *blockPtr,
void *dummy)) stringWriteProc)
(interp, options.format, &block, NULL);
}