/*
* tkCanvBmap.c --
*
* This file implements bitmap items for canvas widgets.
*
* Copyright (c) 1992-1994 The Regents of the University of California.
* 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.
*/
#include "tkInt.h"
#include "tkCanvas.h"
/*
* The structure below defines the record for each bitmap item.
*/
typedef struct BitmapItem {
Tk_Item header; /* Generic stuff that's the same for all
* types. MUST BE FIRST IN STRUCTURE. */
double x, y; /* Coordinates of positioning point for
* bitmap. */
Tk_Anchor anchor; /* Where to anchor bitmap relative to (x,y) */
Pixmap bitmap; /* Bitmap to display in window. */
Pixmap activeBitmap; /* Bitmap to display in window. */
Pixmap disabledBitmap; /* Bitmap to display in window. */
XColor *fgColor; /* Foreground color to use for bitmap. */
XColor *activeFgColor; /* Foreground color to use for bitmap. */
XColor *disabledFgColor; /* Foreground color to use for bitmap. */
XColor *bgColor; /* Background color to use for bitmap. */
XColor *activeBgColor; /* Background color to use for bitmap. */
XColor *disabledBgColor; /* Background color to use for bitmap. */
GC gc; /* Graphics context to use for drawing bitmap
* on screen. */
} BitmapItem;
/*
* Information used for parsing configuration specs:
*/
static const Tk_CustomOption stateOption = {
TkStateParseProc, TkStatePrintProc, INT2PTR(2)
};
static const Tk_CustomOption tagsOption = {
Tk_CanvasTagsParseProc, Tk_CanvasTagsPrintProc, NULL
};
static const Tk_ConfigSpec configSpecs[] = {
{TK_CONFIG_COLOR, "-activebackground", NULL, NULL,
NULL, Tk_Offset(BitmapItem, activeBgColor), TK_CONFIG_NULL_OK, NULL},
{TK_CONFIG_BITMAP, "-activebitmap", NULL, NULL,
NULL, Tk_Offset(BitmapItem, activeBitmap), TK_CONFIG_NULL_OK, NULL},
{TK_CONFIG_COLOR, "-activeforeground", NULL, NULL,
NULL, Tk_Offset(BitmapItem, activeFgColor), TK_CONFIG_NULL_OK, NULL},
{TK_CONFIG_ANCHOR, "-anchor", NULL, NULL,
"center", Tk_Offset(BitmapItem, anchor), TK_CONFIG_DONT_SET_DEFAULT, NULL},
{TK_CONFIG_COLOR, "-background", NULL, NULL,
NULL, Tk_Offset(BitmapItem, bgColor), TK_CONFIG_NULL_OK, NULL},
{TK_CONFIG_BITMAP, "-bitmap", NULL, NULL,
NULL, Tk_Offset(BitmapItem, bitmap), TK_CONFIG_NULL_OK, NULL},
{TK_CONFIG_COLOR, "-disabledbackground", NULL, NULL,
NULL, Tk_Offset(BitmapItem, disabledBgColor),
TK_CONFIG_NULL_OK, NULL},
{TK_CONFIG_BITMAP, "-disabledbitmap", NULL, NULL,
NULL, Tk_Offset(BitmapItem, disabledBitmap),
TK_CONFIG_NULL_OK, NULL},
{TK_CONFIG_COLOR, "-disabledforeground", NULL, NULL,
NULL, Tk_Offset(BitmapItem, disabledFgColor),
TK_CONFIG_NULL_OK, NULL},
{TK_CONFIG_COLOR, "-foreground", NULL, NULL,
"black", Tk_Offset(BitmapItem, fgColor), 0, NULL},
{TK_CONFIG_CUSTOM, "-state", NULL, NULL,
NULL, Tk_Offset(Tk_Item, state), TK_CONFIG_NULL_OK,
&stateOption},
{TK_CONFIG_CUSTOM, "-tags", NULL, NULL,
NULL, 0, TK_CONFIG_NULL_OK, &tagsOption},
{TK_CONFIG_END, NULL, NULL, NULL, NULL, 0, 0, NULL}
};
/*
* Prototypes for functions defined in this file:
*/
static int BitmapCoords(Tcl_Interp *interp,
Tk_Canvas canvas, Tk_Item *itemPtr, int objc,
Tcl_Obj *const objv[]);
static int BitmapToArea(Tk_Canvas canvas,
Tk_Item *itemPtr, double *rectPtr);
static double BitmapToPoint(Tk_Canvas canvas,
Tk_Item *itemPtr, double *coordPtr);
static int BitmapToPostscript(Tcl_Interp *interp,
Tk_Canvas canvas, Tk_Item *itemPtr, int prepass);
static void ComputeBitmapBbox(Tk_Canvas canvas,
BitmapItem *bmapPtr);
static int ConfigureBitmap(Tcl_Interp *interp,
Tk_Canvas canvas, Tk_Item *itemPtr, int objc,
Tcl_Obj *const objv[], int flags);
static int TkcCreateBitmap(Tcl_Interp *interp,
Tk_Canvas canvas, struct Tk_Item *itemPtr,
int objc, Tcl_Obj *const objv[]);
static void DeleteBitmap(Tk_Canvas canvas,
Tk_Item *itemPtr, Display *display);
static void DisplayBitmap(Tk_Canvas canvas,
Tk_Item *itemPtr, Display *display, Drawable dst,
int x, int y, int width, int height);
static void ScaleBitmap(Tk_Canvas canvas,
Tk_Item *itemPtr, double originX, double originY,
double scaleX, double scaleY);
static void TranslateBitmap(Tk_Canvas canvas, Tk_Item *itemPtr,
double deltaX, double deltaY);
/*
* The structures below defines the bitmap item type in terms of functions
* that can be invoked by generic item code.
*/
Tk_ItemType tkBitmapType = {
"bitmap", /* name */
sizeof(BitmapItem), /* itemSize */
TkcCreateBitmap, /* createProc */
configSpecs, /* configSpecs */
ConfigureBitmap, /* configureProc */
BitmapCoords, /* coordProc */
DeleteBitmap, /* deleteProc */
DisplayBitmap, /* displayProc */
TK_CONFIG_OBJS, /* flags */
BitmapToPoint, /* pointProc */
BitmapToArea, /* areaProc */
BitmapToPostscript, /* postscriptProc */
ScaleBitmap, /* scaleProc */
TranslateBitmap, /* translateProc */
NULL, /* indexProc */
NULL, /* icursorProc */
NULL, /* selectionProc */
NULL, /* insertProc */
NULL, /* dTextProc */
NULL, /* nextPtr */
NULL, 0, NULL, NULL
};
/*
*--------------------------------------------------------------
*
* TkcCreateBitmap --
*
* This function is invoked to create a new bitmap item in a canvas.
*
* Results:
* A standard Tcl return value. If an error occurred in creating the
* item, then an error message is left in the interp's result; in this
* case itemPtr is left uninitialized, so it can be safely freed by the
* caller.
*
* Side effects:
* A new bitmap item is created.
*
*--------------------------------------------------------------
*/
static int
TkcCreateBitmap(
Tcl_Interp *interp, /* Interpreter for error reporting. */
Tk_Canvas canvas, /* Canvas to hold new item. */
Tk_Item *itemPtr, /* Record to hold new item; header has been
* initialized by caller. */
int objc, /* Number of arguments in objv. */
Tcl_Obj *const objv[]) /* Arguments describing rectangle. */
{
BitmapItem *bmapPtr = (BitmapItem *) itemPtr;
int i;
if (objc == 0) {
Tcl_Panic("canvas did not pass any coords");
}
/*
* Initialize item's record.
*/
bmapPtr->anchor = TK_ANCHOR_CENTER;
bmapPtr->bitmap = None;
bmapPtr->activeBitmap = None;
bmapPtr->disabledBitmap = None;
bmapPtr->fgColor = NULL;
bmapPtr->activeFgColor = NULL;
bmapPtr->disabledFgColor = NULL;
bmapPtr->bgColor = NULL;
bmapPtr->activeBgColor = NULL;
bmapPtr->disabledBgColor = NULL;
bmapPtr->gc = None;
/*
* Process the arguments to fill in the item record. Only 1 (list) or 2 (x
* y) coords are allowed.
*/
if (objc == 1) {
i = 1;
} else {
const char *arg = Tcl_GetString(objv[1]);
i = 2;
if ((arg[0] == '-') && (arg[1] >= 'a') && (arg[1] <= 'z')) {
i = 1;
}
}
if (BitmapCoords(interp, canvas, itemPtr, i, objv) != TCL_OK) {
goto error;
}
if (ConfigureBitmap(interp, canvas, itemPtr, objc-i, objv+i, 0)
== TCL_OK) {
return TCL_OK;
}
error:
DeleteBitmap(canvas, itemPtr, Tk_Display(Tk_CanvasTkwin(canvas)));
return TCL_ERROR;
}
/*
*--------------------------------------------------------------
*
* BitmapCoords --
*
* This function is invoked to process the "coords" widget command on
* bitmap items. See the user documentation for details on what it does.
*
* Results:
* Returns TCL_OK or TCL_ERROR, and sets the interp's result.
*
* Side effects:
* The coordinates for the given item may be changed.
*
*--------------------------------------------------------------
*/
static int
BitmapCoords(
Tcl_Interp *interp, /* Used for error reporting. */
Tk_Canvas canvas, /* Canvas containing item. */
Tk_Item *itemPtr, /* Item whose coordinates are to be read or
* modified. */
int objc, /* Number of coordinates supplied in objv. */
Tcl_Obj *const objv[]) /* Array of coordinates: x1, y1, x2, y2, ... */
{
BitmapItem *bmapPtr = (BitmapItem *) itemPtr;
if (objc == 0) {
Tcl_Obj *obj = Tcl_NewObj();
Tcl_ListObjAppendElement(NULL, obj, Tcl_NewDoubleObj(bmapPtr->x));
Tcl_ListObjAppendElement(NULL, obj, Tcl_NewDoubleObj(bmapPtr->y));
Tcl_SetObjResult(interp, obj);
} else if (objc < 3) {
if (objc == 1) {
if (Tcl_ListObjGetElements(interp, objv[0], &objc,
(Tcl_Obj ***) &objv) != TCL_OK) {
return TCL_ERROR;
} else if (objc != 2) {
Tcl_SetObjResult(interp, Tcl_ObjPrintf(
"wrong # coordinates: expected 2, got %d", objc));
Tcl_SetErrorCode(interp, "TK", "CANVAS", "COORDS", "BITMAP",
NULL);
return TCL_ERROR;
}
}
if ((Tk_CanvasGetCoordFromObj(interp, canvas, objv[0],
&bmapPtr->x) != TCL_OK)
|| (Tk_CanvasGetCoordFromObj(interp, canvas, objv[1],
&bmapPtr->y) != TCL_OK)) {
return TCL_ERROR;
}
ComputeBitmapBbox(canvas, bmapPtr);
} else {
Tcl_SetObjResult(interp, Tcl_ObjPrintf(
"wrong # coordinates: expected 0 or 2, got %d", objc));
Tcl_SetErrorCode(interp, "TK", "CANVAS", "COORDS", "BITMAP", NULL);
return TCL_ERROR;
}
return TCL_OK;
}
/*
*--------------------------------------------------------------
*
* ConfigureBitmap --
*
* This function is invoked to configure various aspects of a bitmap
* item, such as its anchor position.
*
* Results:
* A standard Tcl result code. If an error occurs, then an error message
* is left in the interp's result.
*
* Side effects:
* Configuration information may be set for itemPtr.
*
*--------------------------------------------------------------
*/
static int
ConfigureBitmap(
Tcl_Interp *interp, /* Used for error reporting. */
Tk_Canvas canvas, /* Canvas containing itemPtr. */
Tk_Item *itemPtr, /* Bitmap item to reconfigure. */
int objc, /* Number of elements in objv. */
Tcl_Obj *const objv[], /* Arguments describing things to configure. */
int flags) /* Flags to pass to Tk_ConfigureWidget. */
{
BitmapItem *bmapPtr = (BitmapItem *) itemPtr;
XGCValues gcValues;
GC newGC;
Tk_Window tkwin;
unsigned long mask;
XColor *fgColor;
XColor *bgColor;
Pixmap bitmap;
Tk_State state;
tkwin = Tk_CanvasTkwin(canvas);
if (TCL_OK != Tk_ConfigureWidget(interp, tkwin, configSpecs, objc,
(const char **) objv, (char *) bmapPtr, flags|TK_CONFIG_OBJS)) {
return TCL_ERROR;
}
/*
* A few of the options require additional processing, such as those that
* determine the graphics context.
*/
state = itemPtr->state;
if (bmapPtr->activeFgColor!=NULL ||
bmapPtr->activeBgColor!=NULL ||
bmapPtr->activeBitmap!=None) {
itemPtr->redraw_flags |= TK_ITEM_STATE_DEPENDANT;
} else {
itemPtr->redraw_flags &= ~TK_ITEM_STATE_DEPENDANT;
}
if (state == TK_STATE_NULL) {
state = Canvas(canvas)->canvas_state;
}
if (state == TK_STATE_HIDDEN) {
ComputeBitmapBbox(canvas, bmapPtr);
return TCL_OK;
}
fgColor = bmapPtr->fgColor;
bgColor = bmapPtr->bgColor;
bitmap = bmapPtr->bitmap;
if (Canvas(canvas)->currentItemPtr == itemPtr) {
if (bmapPtr->activeFgColor!=NULL) {
fgColor = bmapPtr->activeFgColor;
}
if (bmapPtr->activeBgColor!=NULL) {
bgColor = bmapPtr->activeBgColor;
}
if (bmapPtr->activeBitmap!=None) {
bitmap = bmapPtr->activeBitmap;
}
} else if (state == TK_STATE_DISABLED) {
if (bmapPtr->disabledFgColor!=NULL) {
fgColor = bmapPtr->disabledFgColor;
}
if (bmapPtr->disabledBgColor!=NULL) {
bgColor = bmapPtr->disabledBgColor;
}
if (bmapPtr->disabledBitmap!=None) {
bitmap = bmapPtr->disabledBitmap;
}
}
if (bitmap == None) {
newGC = None;
} else {
gcValues.foreground = fgColor->pixel;
mask = GCForeground;
if (bgColor != NULL) {
gcValues.background = bgColor->pixel;
mask |= GCBackground;
} else {
gcValues.clip_mask = bitmap;
mask |= GCClipMask;
}
newGC = Tk_GetGC(tkwin, mask, &gcValues);
}
if (bmapPtr->gc != None) {
Tk_FreeGC(Tk_Display(tkwin), bmapPtr->gc);
}
bmapPtr->gc = newGC;
ComputeBitmapBbox(canvas, bmapPtr);
return TCL_OK;
}
/*
*--------------------------------------------------------------
*
* DeleteBitmap --
*
* This function is called to clean up the data structure associated with
* a bitmap item.
*
* Results:
* None.
*
* Side effects:
* Resources associated with itemPtr are released.
*
*--------------------------------------------------------------
*/
static void
DeleteBitmap(
Tk_Canvas canvas, /* Info about overall canvas widget. */
Tk_Item *itemPtr, /* Item that is being deleted. */
Display *display) /* Display containing window for canvas. */
{
BitmapItem *bmapPtr = (BitmapItem *) itemPtr;
if (bmapPtr->bitmap != None) {
Tk_FreeBitmap(display, bmapPtr->bitmap);
}
if (bmapPtr->activeBitmap != None) {
Tk_FreeBitmap(display, bmapPtr->activeBitmap);
}
if (bmapPtr->disabledBitmap != None) {
Tk_FreeBitmap(display, bmapPtr->disabledBitmap);
}
if (bmapPtr->fgColor != NULL) {
Tk_FreeColor(bmapPtr->fgColor);
}
if (bmapPtr->activeFgColor != NULL) {
Tk_FreeColor(bmapPtr->activeFgColor);
}
if (bmapPtr->disabledFgColor != NULL) {
Tk_FreeColor(bmapPtr->disabledFgColor);
}
if (bmapPtr->bgColor != NULL) {
Tk_FreeColor(bmapPtr->bgColor);
}
if (bmapPtr->activeBgColor != NULL) {
Tk_FreeColor(bmapPtr->activeBgColor);
}
if (bmapPtr->disabledBgColor != NULL) {
Tk_FreeColor(bmapPtr->disabledBgColor);
}
if (bmapPtr->gc != NULL) {
Tk_FreeGC(display, bmapPtr->gc);
}
}
/*
*--------------------------------------------------------------
*
* ComputeBitmapBbox --
*
* This function is invoked to compute the bounding box of all the pixels
* that may be drawn as part of a bitmap item. This function is where the
* child bitmap's placement is computed.
*
* Results:
* None.
*
* Side effects:
* The fields x1, y1, x2, and y2 are updated in the header for itemPtr.
*
*--------------------------------------------------------------
*/
/* ARGSUSED */
static void
ComputeBitmapBbox(
Tk_Canvas canvas, /* Canvas that contains item. */
BitmapItem *bmapPtr) /* Item whose bbox is to be recomputed. */
{
int width, height;
int x, y;
Pixmap bitmap;
Tk_State state = bmapPtr->header.state;
if (state == TK_STATE_NULL) {
state = Canvas(canvas)->canvas_state;
}
bitmap = bmapPtr->bitmap;
if (Canvas(canvas)->currentItemPtr == (Tk_Item *)bmapPtr) {
if (bmapPtr->activeBitmap!=None) {
bitmap = bmapPtr->activeBitmap;
}
} else if (state==TK_STATE_DISABLED) {
if (bmapPtr->disabledBitmap!=None) {
bitmap = bmapPtr->disabledBitmap;
}
}
x = (int) (bmapPtr->x + ((bmapPtr->x >= 0) ? 0.5 : - 0.5));
y = (int) (bmapPtr->y + ((bmapPtr->y >= 0) ? 0.5 : - 0.5));
if (state==TK_STATE_HIDDEN || bitmap == None) {
bmapPtr->header.x1 = bmapPtr->header.x2 = x;
bmapPtr->header.y1 = bmapPtr->header.y2 = y;
return;
}
/*
* Compute location and size of bitmap, using anchor information.
*/
Tk_SizeOfBitmap(Tk_Display(Tk_CanvasTkwin(canvas)), bitmap,
&width, &height);
switch (bmapPtr->anchor) {
case TK_ANCHOR_N:
x -= width/2;
break;
case TK_ANCHOR_NE:
x -= width;
break;
case TK_ANCHOR_E:
x -= width;
y -= height/2;
break;
case TK_ANCHOR_SE:
x -= width;
y -= height;
break;
case TK_ANCHOR_S:
x -= width/2;
y -= height;
break;
case TK_ANCHOR_SW:
y -= height;
break;
case TK_ANCHOR_W:
y -= height/2;
break;
case TK_ANCHOR_NW:
break;
case TK_ANCHOR_CENTER:
x -= width/2;
y -= height/2;
break;
}
/*
* Store the information in the item header.
*/
bmapPtr->header.x1 = x;
bmapPtr->header.y1 = y;
bmapPtr->header.x2 = x + width;
bmapPtr->header.y2 = y + height;
}
/*
*--------------------------------------------------------------
*
* DisplayBitmap --
*
* This function is invoked to draw a bitmap item in a given drawable.
*
* Results:
* None.
*
* Side effects:
* ItemPtr is drawn in drawable using the transformation information in
* canvas.
*
*--------------------------------------------------------------
*/
static void
DisplayBitmap(
Tk_Canvas canvas, /* Canvas that contains item. */
Tk_Item *itemPtr, /* Item to be displayed. */
Display *display, /* Display on which to draw item. */
Drawable drawable, /* Pixmap or window in which to draw item. */
int x, int y, int width, int height)
/* Describes region of canvas that must be
* redisplayed (not used). */
{
BitmapItem *bmapPtr = (BitmapItem *) itemPtr;
int bmapX, bmapY, bmapWidth, bmapHeight;
short drawableX, drawableY;
Pixmap bitmap;
Tk_State state = itemPtr->state;
/*
* If the area being displayed doesn't cover the whole bitmap, then only
* redisplay the part of the bitmap that needs redisplay.
*/
if (state == TK_STATE_NULL) {
state = Canvas(canvas)->canvas_state;
}
bitmap = bmapPtr->bitmap;
if (Canvas(canvas)->currentItemPtr == itemPtr) {
if (bmapPtr->activeBitmap!=None) {
bitmap = bmapPtr->activeBitmap;
}
} else if (state == TK_STATE_DISABLED) {
if (bmapPtr->disabledBitmap!=None) {
bitmap = bmapPtr->disabledBitmap;
}
}
if (bitmap != None) {
if (x > bmapPtr->header.x1) {
bmapX = x - bmapPtr->header.x1;
bmapWidth = bmapPtr->header.x2 - x;
} else {
bmapX = 0;
if ((x+width) < bmapPtr->header.x2) {
bmapWidth = x + width - bmapPtr->header.x1;
} else {
bmapWidth = bmapPtr->header.x2 - bmapPtr->header.x1;
}
}
if (y > bmapPtr->header.y1) {
bmapY = y - bmapPtr->header.y1;
bmapHeight = bmapPtr->header.y2 - y;
} else {
bmapY = 0;
if ((y+height) < bmapPtr->header.y2) {
bmapHeight = y + height - bmapPtr->header.y1;
} else {
bmapHeight = bmapPtr->header.y2 - bmapPtr->header.y1;
}
}
Tk_CanvasDrawableCoords(canvas,
(double) (bmapPtr->header.x1 + bmapX),
(double) (bmapPtr->header.y1 + bmapY),
&drawableX, &drawableY);
/*
* Must modify the mask origin within the graphics context to line up
* with the bitmap's origin (in order to make bitmaps with
* "-background {}" work right).
*/
XSetClipOrigin(display, bmapPtr->gc, drawableX - bmapX,
drawableY - bmapY);
XCopyPlane(display, bitmap, drawable,
bmapPtr->gc, bmapX, bmapY, (unsigned int) bmapWidth,
(unsigned int) bmapHeight, drawableX, drawableY, 1);
XSetClipOrigin(display, bmapPtr->gc, 0, 0);
}
}
/*
*--------------------------------------------------------------
*
* BitmapToPoint --
*
* Computes the distance from a given point to a given rectangle, in
* canvas units.
*
* Results:
* The return value is 0 if the point whose x and y coordinates are
* coordPtr[0] and coordPtr[1] is inside the bitmap. If the point isn't
* inside the bitmap then the return value is the distance from the point
* to the bitmap.
*
* Side effects:
* None.
*
*--------------------------------------------------------------
*/
/* ARGSUSED */
static double
BitmapToPoint(
Tk_Canvas canvas, /* Canvas containing item. */
Tk_Item *itemPtr, /* Item to check against point. */
double *coordPtr) /* Pointer to x and y coordinates. */
{
BitmapItem *bmapPtr = (BitmapItem *) itemPtr;
double x1, x2, y1, y2, xDiff, yDiff;
x1 = bmapPtr->header.x1;
y1 = bmapPtr->header.y1;
x2 = bmapPtr->header.x2;
y2 = bmapPtr->header.y2;
/*
* Point is outside rectangle.
*/
if (coordPtr[0] < x1) {
xDiff = x1 - coordPtr[0];
} else if (coordPtr[0] > x2) {
xDiff = coordPtr[0] - x2;
} else {
xDiff = 0;
}
if (coordPtr[1] < y1) {
yDiff = y1 - coordPtr[1];
} else if (coordPtr[1] > y2) {
yDiff = coordPtr[1] - y2;
} else {
yDiff = 0;
}
return hypot(xDiff, yDiff);
}
/*
*--------------------------------------------------------------
*
* BitmapToArea --
*
* This function is called to determine whether an item lies entirely
* inside, entirely outside, or overlapping a given rectangle.
*
* Results:
* -1 is returned if the item is entirely outside the area given by
* rectPtr, 0 if it overlaps, and 1 if it is entirely inside the given
* area.
*
* Side effects:
* None.
*
*--------------------------------------------------------------
*/
/* ARGSUSED */
static int
BitmapToArea(
Tk_Canvas canvas, /* Canvas containing item. */
Tk_Item *itemPtr, /* Item to check against rectangle. */
double *rectPtr) /* Pointer to array of four coordinates
* (x1,y1,x2,y2) describing rectangular
* area. */
{
BitmapItem *bmapPtr = (BitmapItem *) itemPtr;
if ((rectPtr[2] <= bmapPtr->header.x1)
|| (rectPtr[0] >= bmapPtr->header.x2)
|| (rectPtr[3] <= bmapPtr->header.y1)
|| (rectPtr[1] >= bmapPtr->header.y2)) {
return -1;
}
if ((rectPtr[0] <= bmapPtr->header.x1)
&& (rectPtr[1] <= bmapPtr->header.y1)
&& (rectPtr[2] >= bmapPtr->header.x2)
&& (rectPtr[3] >= bmapPtr->header.y2)) {
return 1;
}
return 0;
}
/*
*--------------------------------------------------------------
*
* ScaleBitmap --
*
* This function is invoked to rescale a bitmap item in a canvas. It is
* one of the standard item functions for bitmap items, and is invoked by
* the generic canvas code.
*
* Results:
* None.
*
* Side effects:
* The item referred to by itemPtr is rescaled so that the following
* transformation is applied to all point coordinates:
* x' = originX + scaleX*(x-originX)
* y' = originY + scaleY*(y-originY)
*
*--------------------------------------------------------------
*/
static void
ScaleBitmap(
Tk_Canvas canvas, /* Canvas containing rectangle. */
Tk_Item *itemPtr, /* Rectangle to be scaled. */
double originX, double originY,
/* Origin about which to scale item. */
double scaleX, /* Amount to scale in X direction. */
double scaleY) /* Amount to scale in Y direction. */
{
BitmapItem *bmapPtr = (BitmapItem *) itemPtr;
bmapPtr->x = originX + scaleX*(bmapPtr->x - originX);
bmapPtr->y = originY + scaleY*(bmapPtr->y - originY);
ComputeBitmapBbox(canvas, bmapPtr);
}
/*
*--------------------------------------------------------------
*
* TranslateBitmap --
*
* This function is called to move an item by a given amount.
*
* Results:
* None.
*
* Side effects:
* The position of the item is offset by (xDelta, yDelta), and the
* bounding box is updated in the generic part of the item structure.
*
*--------------------------------------------------------------
*/
static void
TranslateBitmap(
Tk_Canvas canvas, /* Canvas containing item. */
Tk_Item *itemPtr, /* Item that is being moved. */
double deltaX, double deltaY)
/* Amount by which item is to be moved. */
{
BitmapItem *bmapPtr = (BitmapItem *) itemPtr;
bmapPtr->x += deltaX;
bmapPtr->y += deltaY;
ComputeBitmapBbox(canvas, bmapPtr);
}
/*
*--------------------------------------------------------------
*
* BitmapToPostscript --
*
* This function is called to generate Postscript for bitmap items.
*
* Results:
* The return value is a standard Tcl result. If an error occurs in
* generating Postscript then an error message is left in the interp's
* result, replacing whatever used to be there. If no error occurs, then
* Postscript for the item is appended to the result.
*
* Side effects:
* None.
*
*--------------------------------------------------------------
*/
static int
BitmapToPostscript(
Tcl_Interp *interp, /* Leave Postscript or error message here. */
Tk_Canvas canvas, /* Information about overall canvas. */
Tk_Item *itemPtr, /* Item for which Postscript is wanted. */
int prepass) /* 1 means this is a prepass to collect font
* information; 0 means final Postscript is
* being created. */
{
BitmapItem *bmapPtr = (BitmapItem *) itemPtr;
double x, y;
int width, height, rowsAtOnce, rowsThisTime;
int curRow;
XColor *fgColor;
XColor *bgColor;
Pixmap bitmap;
Tk_State state = itemPtr->state;
Tcl_Obj *psObj;
Tcl_InterpState interpState;
if (state == TK_STATE_NULL) {
state = Canvas(canvas)->canvas_state;
}
fgColor = bmapPtr->fgColor;
bgColor = bmapPtr->bgColor;
bitmap = bmapPtr->bitmap;
if (Canvas(canvas)->currentItemPtr == itemPtr) {
if (bmapPtr->activeFgColor!=NULL) {
fgColor = bmapPtr->activeFgColor;
}
if (bmapPtr->activeBgColor!=NULL) {
bgColor = bmapPtr->activeBgColor;
}
if (bmapPtr->activeBitmap!=None) {
bitmap = bmapPtr->activeBitmap;
}
} else if (state == TK_STATE_DISABLED) {
if (bmapPtr->disabledFgColor!=NULL) {
fgColor = bmapPtr->disabledFgColor;
}
if (bmapPtr->disabledBgColor!=NULL) {
bgColor = bmapPtr->disabledBgColor;
}
if (bmapPtr->disabledBitmap!=None) {
bitmap = bmapPtr->disabledBitmap;
}
}
if (bitmap == None) {
return TCL_OK;
}
/*
* Compute the coordinates of the lower-left corner of the bitmap, taking
* into account the anchor position for the bitmp.
*/
x = bmapPtr->x;
y = Tk_CanvasPsY(canvas, bmapPtr->y);
Tk_SizeOfBitmap(Tk_Display(Tk_CanvasTkwin(canvas)), bitmap,
&width, &height);
switch (bmapPtr->anchor) {
case TK_ANCHOR_NW: y -= height; break;
case TK_ANCHOR_N: x -= width/2.0; y -= height; break;
case TK_ANCHOR_NE: x -= width; y -= height; break;
case TK_ANCHOR_E: x -= width; y -= height/2.0; break;
case TK_ANCHOR_SE: x -= width; break;
case TK_ANCHOR_S: x -= width/2.0; break;
case TK_ANCHOR_SW: break;
case TK_ANCHOR_W: y -= height/2.0; break;
case TK_ANCHOR_CENTER: x -= width/2.0; y -= height/2.0; break;
}
/*
* Make our working space.
*/
psObj = Tcl_NewObj();
interpState = Tcl_SaveInterpState(interp, TCL_OK);
/*
* Color the background, if there is one.
*/
if (bgColor != NULL) {
Tcl_AppendPrintfToObj(psObj,
"%.15g %.15g moveto %d 0 rlineto 0 %d rlineto "
"%d 0 rlineto closepath\n",
x, y, width, height, -width);
Tcl_ResetResult(interp);
if (Tk_CanvasPsColor(interp, canvas, bgColor) != TCL_OK) {
goto error;
}
Tcl_AppendObjToObj(psObj, Tcl_GetObjResult(interp));
Tcl_AppendToObj(psObj, "fill\n", -1);
}
/*
* Draw the bitmap, if there is a foreground color. If the bitmap is very
* large, then chop it up into multiple bitmaps, each consisting of one or
* more rows. This is needed because Postscript can't handle single
* strings longer than 64 KBytes long.
*/
if (fgColor != NULL) {
Tcl_ResetResult(interp);
if (Tk_CanvasPsColor(interp, canvas, fgColor) != TCL_OK) {
goto error;
}
Tcl_AppendObjToObj(psObj, Tcl_GetObjResult(interp));
if (width > 60000) {
Tcl_SetObjResult(interp, Tcl_NewStringObj(
"can't generate Postscript for bitmaps more than 60000"
" pixels wide", -1));
Tcl_SetErrorCode(interp, "TK", "CANVAS", "PS", "MEMLIMIT", NULL);
goto error;
}
rowsAtOnce = 60000/width;
if (rowsAtOnce < 1) {
rowsAtOnce = 1;
}
Tcl_AppendPrintfToObj(psObj, "%.15g %.15g translate\n", x, y+height);
for (curRow = 0; curRow < height; curRow += rowsAtOnce) {
rowsThisTime = rowsAtOnce;
if (rowsThisTime > (height - curRow)) {
rowsThisTime = height - curRow;
}
Tcl_AppendPrintfToObj(psObj,
"0 -%.15g translate\n%d %d true matrix {\n",
(double) rowsThisTime, width, rowsThisTime);
Tcl_ResetResult(interp);
if (Tk_CanvasPsBitmap(interp, canvas, bitmap,
0, curRow, width, rowsThisTime) != TCL_OK) {
goto error;
}
Tcl_AppendObjToObj(psObj, Tcl_GetObjResult(interp));
Tcl_AppendToObj(psObj, "\n} imagemask\n", -1);
}
}
/*
* Plug the accumulated postscript back into the result.
*/
(void) Tcl_RestoreInterpState(interp, interpState);
Tcl_AppendObjToObj(Tcl_GetObjResult(interp), psObj);
Tcl_DecrRefCount(psObj);
return TCL_OK;
error:
Tcl_DiscardInterpState(interpState);
Tcl_DecrRefCount(psObj);
return TCL_ERROR;
}
/*
* Local Variables:
* mode: c
* c-basic-offset: 4
* fill-column: 78
* End:
*/