/*
* tkCanvPs.c --
*
* This module provides Postscript output support for canvases, including
* the "postscript" widget command plus a few utility functions used for
* generating Postscript.
*
* Copyright (c) 1991-1994 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.
*
* RCS: @(#) $Id: tkCanvPs.c,v 1.20 2008/04/27 22:38:55 dkf Exp $
*/
#include "tkInt.h"
#include "tkCanvas.h"
/*
* See tkCanvas.h for key data structures used to implement canvases.
*/
/*
* The following definition is used in generating postscript for images and
* windows.
*/
typedef struct TkColormapData { /* Hold color information for a window */
int separated; /* Whether to use separate color bands */
int color; /* Whether window is color or black/white */
int ncolors; /* Number of color values stored */
XColor *colors; /* Pixel value -> RGB mappings */
int red_mask, green_mask, blue_mask; /* Masks and shifts for each */
int red_shift, green_shift, blue_shift; /* color band */
} TkColormapData;
/*
* One of the following structures is created to keep track of Postscript
* output being generated. It consists mostly of information provided on the
* widget command line.
*/
typedef struct TkPostscriptInfo {
int x, y, width, height; /* Area to print, in canvas pixel
* coordinates. */
int x2, y2; /* x+width and y+height. */
char *pageXString; /* String value of "-pagex" option or NULL. */
char *pageYString; /* String value of "-pagey" option or NULL. */
double pageX, pageY; /* Postscript coordinates (in points)
* corresponding to pageXString and
* pageYString. Don't forget that y-values
* grow upwards for Postscript! */
char *pageWidthString; /* Printed width of output. */
char *pageHeightString; /* Printed height of output. */
double scale; /* Scale factor for conversion: each pixel
* maps into this many points. */
Tk_Anchor pageAnchor; /* How to anchor bbox on Postscript page. */
int rotate; /* Non-zero means output should be rotated on
* page (landscape mode). */
char *fontVar; /* If non-NULL, gives name of global variable
* containing font mapping information.
* Malloc'ed. */
char *colorVar; /* If non-NULL, give name of global variable
* containing color mapping information.
* Malloc'ed. */
char *colorMode; /* Mode for handling colors: "monochrome",
* "gray", or "color". Malloc'ed. */
int colorLevel; /* Numeric value corresponding to colorMode: 0
* for mono, 1 for gray, 2 for color. */
char *fileName; /* Name of file in which to write Postscript;
* NULL means return Postscript info as
* result. Malloc'ed. */
char *channelName; /* If -channel is specified, the name of the
* channel to use. */
Tcl_Channel chan; /* Open channel corresponding to fileName. */
Tcl_HashTable fontTable; /* Hash table containing names of all font
* families used in output. The hash table
* values are not used. */
int prepass; /* Non-zero means that we're currently in the
* pre-pass that collects font information, so
* the Postscript generated isn't relevant. */
int prolog; /* Non-zero means output should contain the
* file prolog.ps in the header. */
} TkPostscriptInfo;
/*
* The table below provides a template that's used to process arguments to the
* canvas "postscript" command and fill in TkPostscriptInfo structures.
*/
static Tk_ConfigSpec configSpecs[] = {
{TK_CONFIG_STRING, "-colormap", NULL, NULL,
"", Tk_Offset(TkPostscriptInfo, colorVar), 0},
{TK_CONFIG_STRING, "-colormode", NULL, NULL,
"", Tk_Offset(TkPostscriptInfo, colorMode), 0},
{TK_CONFIG_STRING, "-file", NULL, NULL,
"", Tk_Offset(TkPostscriptInfo, fileName), 0},
{TK_CONFIG_STRING, "-channel", NULL, NULL,
"", Tk_Offset(TkPostscriptInfo, channelName), 0},
{TK_CONFIG_STRING, "-fontmap", NULL, NULL,
"", Tk_Offset(TkPostscriptInfo, fontVar), 0},
{TK_CONFIG_PIXELS, "-height", NULL, NULL,
"", Tk_Offset(TkPostscriptInfo, height), 0},
{TK_CONFIG_ANCHOR, "-pageanchor", NULL, NULL,
"", Tk_Offset(TkPostscriptInfo, pageAnchor), 0},
{TK_CONFIG_STRING, "-pageheight", NULL, NULL,
"", Tk_Offset(TkPostscriptInfo, pageHeightString), 0},
{TK_CONFIG_STRING, "-pagewidth", NULL, NULL,
"", Tk_Offset(TkPostscriptInfo, pageWidthString), 0},
{TK_CONFIG_STRING, "-pagex", NULL, NULL,
"", Tk_Offset(TkPostscriptInfo, pageXString), 0},
{TK_CONFIG_STRING, "-pagey", NULL, NULL,
"", Tk_Offset(TkPostscriptInfo, pageYString), 0},
{TK_CONFIG_BOOLEAN, "-prolog", NULL, NULL,
"", Tk_Offset(TkPostscriptInfo, prolog), 0},
{TK_CONFIG_BOOLEAN, "-rotate", NULL, NULL,
"", Tk_Offset(TkPostscriptInfo, rotate), 0},
{TK_CONFIG_PIXELS, "-width", NULL, NULL,
"", Tk_Offset(TkPostscriptInfo, width), 0},
{TK_CONFIG_PIXELS, "-x", NULL, NULL,
"", Tk_Offset(TkPostscriptInfo, x), 0},
{TK_CONFIG_PIXELS, "-y", NULL, NULL,
"", Tk_Offset(TkPostscriptInfo, y), 0},
{TK_CONFIG_END, NULL, NULL, NULL, NULL, 0, 0}
};
/*
* Forward declarations for functions defined later in this file:
*/
static int GetPostscriptPoints(Tcl_Interp *interp,
char *string, double *doublePtr);
/*
*--------------------------------------------------------------
*
* TkCanvPostscriptCmd --
*
* This function is invoked to process the "postscript" options of the
* widget command for canvas widgets. See the user documentation for
* details on what it does.
*
* Results:
* A standard Tcl result.
*
* Side effects:
* See the user documentation.
*
*--------------------------------------------------------------
*/
/* ARGSUSED */
int
TkCanvPostscriptCmd(
TkCanvas *canvasPtr, /* Information about canvas widget. */
Tcl_Interp *interp, /* Current interpreter. */
int argc, /* Number of arguments. */
const char **argv) /* Argument strings. Caller has already parsed
* this command enough to know that argv[1] is
* "postscript". */
{
TkPostscriptInfo psInfo, *psInfoPtr = &psInfo;
Tk_PostscriptInfo oldInfoPtr;
int result;
Tk_Item *itemPtr;
#define STRING_LENGTH 400
char string[STRING_LENGTH+1];
const char *p;
time_t now;
size_t length;
Tk_Window tkwin = canvasPtr->tkwin;
Tcl_HashSearch search;
Tcl_HashEntry *hPtr;
Tcl_DString buffer;
char psenccmd[] = "::tk::ensure_psenc_is_loaded";
int deltaX = 0, deltaY = 0; /* Offset of lower-left corner of area to be
* marked up, measured in canvas units from
* the positioning point on the page (reflects
* anchor position). Initial values needed
* only to stop compiler warnings. */
/*
* Initialize the data structure describing Postscript generation, then
* process all the arguments to fill the data structure in.
*/
result = Tcl_EvalEx(interp,psenccmd,-1,TCL_EVAL_GLOBAL);
if (result != TCL_OK) {
return result;
}
oldInfoPtr = canvasPtr->psInfo;
canvasPtr->psInfo = (Tk_PostscriptInfo) psInfoPtr;
psInfo.x = canvasPtr->xOrigin;
psInfo.y = canvasPtr->yOrigin;
psInfo.width = -1;
psInfo.height = -1;
psInfo.pageXString = NULL;
psInfo.pageYString = NULL;
psInfo.pageX = 72*4.25;
psInfo.pageY = 72*5.5;
psInfo.pageWidthString = NULL;
psInfo.pageHeightString = NULL;
psInfo.scale = 1.0;
psInfo.pageAnchor = TK_ANCHOR_CENTER;
psInfo.rotate = 0;
psInfo.fontVar = NULL;
psInfo.colorVar = NULL;
psInfo.colorMode = NULL;
psInfo.colorLevel = 0;
psInfo.fileName = NULL;
psInfo.channelName = NULL;
psInfo.chan = NULL;
psInfo.prepass = 0;
psInfo.prolog = 1;
Tcl_InitHashTable(&psInfo.fontTable, TCL_STRING_KEYS);
result = Tk_ConfigureWidget(interp, tkwin, configSpecs, argc-2, argv+2,
(char *) &psInfo, TK_CONFIG_ARGV_ONLY);
if (result != TCL_OK) {
goto cleanup;
}
if (psInfo.width == -1) {
psInfo.width = Tk_Width(tkwin);
}
if (psInfo.height == -1) {
psInfo.height = Tk_Height(tkwin);
}
psInfo.x2 = psInfo.x + psInfo.width;
psInfo.y2 = psInfo.y + psInfo.height;
if (psInfo.pageXString != NULL) {
if (GetPostscriptPoints(interp, psInfo.pageXString,
&psInfo.pageX) != TCL_OK) {
goto cleanup;
}
}
if (psInfo.pageYString != NULL) {
if (GetPostscriptPoints(interp, psInfo.pageYString,
&psInfo.pageY) != TCL_OK) {
goto cleanup;
}
}
if (psInfo.pageWidthString != NULL) {
if (GetPostscriptPoints(interp, psInfo.pageWidthString,
&psInfo.scale) != TCL_OK) {
goto cleanup;
}
psInfo.scale /= psInfo.width;
} else if (psInfo.pageHeightString != NULL) {
if (GetPostscriptPoints(interp, psInfo.pageHeightString,
&psInfo.scale) != TCL_OK) {
goto cleanup;
}
psInfo.scale /= psInfo.height;
} else {
psInfo.scale = (72.0/25.4)*WidthMMOfScreen(Tk_Screen(tkwin));
psInfo.scale /= WidthOfScreen(Tk_Screen(tkwin));
}
switch (psInfo.pageAnchor) {
case TK_ANCHOR_NW:
case TK_ANCHOR_W:
case TK_ANCHOR_SW:
deltaX = 0;
break;
case TK_ANCHOR_N:
case TK_ANCHOR_CENTER:
case TK_ANCHOR_S:
deltaX = -psInfo.width/2;
break;
case TK_ANCHOR_NE:
case TK_ANCHOR_E:
case TK_ANCHOR_SE:
deltaX = -psInfo.width;
break;
}
switch (psInfo.pageAnchor) {
case TK_ANCHOR_NW:
case TK_ANCHOR_N:
case TK_ANCHOR_NE:
deltaY = - psInfo.height;
break;
case TK_ANCHOR_W:
case TK_ANCHOR_CENTER:
case TK_ANCHOR_E:
deltaY = -psInfo.height/2;
break;
case TK_ANCHOR_SW:
case TK_ANCHOR_S:
case TK_ANCHOR_SE:
deltaY = 0;
break;
}
if (psInfo.colorMode == NULL) {
psInfo.colorLevel = 2;
} else {
length = strlen(psInfo.colorMode);
if (strncmp(psInfo.colorMode, "monochrome", length) == 0) {
psInfo.colorLevel = 0;
} else if (strncmp(psInfo.colorMode, "gray", length) == 0) {
psInfo.colorLevel = 1;
} else if (strncmp(psInfo.colorMode, "color", length) == 0) {
psInfo.colorLevel = 2;
} else {
Tcl_AppendResult(interp, "bad color mode \"", psInfo.colorMode,
"\": must be monochrome, gray, or color", NULL);
goto cleanup;
}
}
if (psInfo.fileName != NULL) {
/*
* Check that -file and -channel are not both specified.
*/
if (psInfo.channelName != NULL) {
Tcl_AppendResult(interp, "can't specify both -file",
" and -channel", NULL);
result = TCL_ERROR;
goto cleanup;
}
/*
* Check that we are not in a safe interpreter. If we are, disallow
* the -file specification.
*/
if (Tcl_IsSafe(interp)) {
Tcl_AppendResult(interp, "can't specify -file in a",
" safe interpreter", NULL);
result = TCL_ERROR;
goto cleanup;
}
p = Tcl_TranslateFileName(interp, psInfo.fileName, &buffer);
if (p == NULL) {
goto cleanup;
}
psInfo.chan = Tcl_OpenFileChannel(interp, p, "w", 0666);
Tcl_DStringFree(&buffer);
if (psInfo.chan == NULL) {
goto cleanup;
}
}
if (psInfo.channelName != NULL) {
int mode;
/*
* Check that the channel is found in this interpreter and that it is
* open for writing.
*/
psInfo.chan = Tcl_GetChannel(interp, psInfo.channelName, &mode);
if (psInfo.chan == (Tcl_Channel) NULL) {
result = TCL_ERROR;
goto cleanup;
}
if ((mode & TCL_WRITABLE) == 0) {
Tcl_AppendResult(interp, "channel \"", psInfo.channelName,
"\" wasn't opened for writing", NULL);
result = TCL_ERROR;
goto cleanup;
}
}
/*
* Make a pre-pass over all of the items, generating Postscript and then
* throwing it away. The purpose of this pass is just to collect
* information about all the fonts in use, so that we can output font
* information in the proper form required by the Document Structuring
* Conventions.
*/
psInfo.prepass = 1;
for (itemPtr = canvasPtr->firstItemPtr; itemPtr != NULL;
itemPtr = itemPtr->nextPtr) {
if ((itemPtr->x1 >= psInfo.x2) || (itemPtr->x2 < psInfo.x)
|| (itemPtr->y1 >= psInfo.y2) || (itemPtr->y2 < psInfo.y)) {
continue;
}
if (itemPtr->typePtr->postscriptProc == NULL) {
continue;
}
result = (*itemPtr->typePtr->postscriptProc)(interp,
(Tk_Canvas) canvasPtr, itemPtr, 1);
Tcl_ResetResult(interp);
if (result != TCL_OK) {
/*
* An error just occurred. Just skip out of this loop. There's no
* need to report the error now; it can be reported later (errors
* can happen later that don't happen now, so we still have to
* check for errors later anyway).
*/
break;
}
}
psInfo.prepass = 0;
/*
* Generate the header and prolog for the Postscript.
*/
if (psInfo.prolog) {
Tcl_AppendResult(interp, "%!PS-Adobe-3.0 EPSF-3.0\n",
"%%Creator: Tk Canvas Widget\n", NULL);
#ifdef HAVE_PW_GECOS
if (!Tcl_IsSafe(interp)) {
struct passwd *pwPtr = getpwuid(getuid()); /* INTL: Native. */
Tcl_AppendResult(interp, "%%For: ",
(pwPtr != NULL) ? pwPtr->pw_gecos : "Unknown", "\n", NULL);
endpwent();
}
#endif /* HAVE_PW_GECOS */
Tcl_AppendResult(interp, "%%Title: Window ", Tk_PathName(tkwin), "\n",
NULL);
time(&now);
Tcl_AppendResult(interp, "%%CreationDate: ",
ctime(&now), NULL); /* INTL: Native. */
if (!psInfo.rotate) {
sprintf(string, "%d %d %d %d",
(int) (psInfo.pageX + psInfo.scale*deltaX),
(int) (psInfo.pageY + psInfo.scale*deltaY),
(int) (psInfo.pageX + psInfo.scale*(deltaX + psInfo.width)
+ 1.0),
(int) (psInfo.pageY + psInfo.scale*(deltaY + psInfo.height)
+ 1.0));
} else {
sprintf(string, "%d %d %d %d",
(int) (psInfo.pageX - psInfo.scale*(deltaY+psInfo.height)),
(int) (psInfo.pageY + psInfo.scale*deltaX),
(int) (psInfo.pageX - psInfo.scale*deltaY + 1.0),
(int) (psInfo.pageY + psInfo.scale*(deltaX + psInfo.width)
+ 1.0));
}
Tcl_AppendResult(interp, "%%BoundingBox: ", string, "\n", NULL);
Tcl_AppendResult(interp, "%%Pages: 1\n",
"%%DocumentData: Clean7Bit\n", NULL);
Tcl_AppendResult(interp, "%%Orientation: ",
psInfo.rotate ? "Landscape\n" : "Portrait\n", NULL);
p = "%%DocumentNeededResources: font ";
for (hPtr = Tcl_FirstHashEntry(&psInfo.fontTable, &search);
hPtr != NULL; hPtr = Tcl_NextHashEntry(&search)) {
Tcl_AppendResult(interp, p,
Tcl_GetHashKey(&psInfo.fontTable, hPtr), "\n", NULL);
p = "%%+ font ";
}
Tcl_AppendResult(interp, "%%EndComments\n\n", NULL);
/*
* Insert the prolog
*/
Tcl_AppendResult(interp, Tcl_GetVar(interp,"::tk::ps_preamable",
TCL_GLOBAL_ONLY), NULL);
if (psInfo.chan != NULL) {
Tcl_Write(psInfo.chan, Tcl_GetStringResult(interp), -1);
Tcl_ResetResult(canvasPtr->interp);
}
/*
* Document setup: set the color level and include fonts.
*/
sprintf(string, "/CL %d def\n", psInfo.colorLevel);
Tcl_AppendResult(interp, "%%BeginSetup\n", string, NULL);
for (hPtr = Tcl_FirstHashEntry(&psInfo.fontTable, &search);
hPtr != NULL; hPtr = Tcl_NextHashEntry(&search)) {
Tcl_AppendResult(interp, "%%IncludeResource: font ",
Tcl_GetHashKey(&psInfo.fontTable, hPtr), "\n", NULL);
}
Tcl_AppendResult(interp, "%%EndSetup\n\n", NULL);
/*
* Page setup: move to page positioning point, rotate if needed, set
* scale factor, offset for proper anchor position, and set clip
* region.
*/
Tcl_AppendResult(interp, "%%Page: 1 1\n", "save\n", NULL);
sprintf(string, "%.1f %.1f translate\n", psInfo.pageX, psInfo.pageY);
Tcl_AppendResult(interp, string, NULL);
if (psInfo.rotate) {
Tcl_AppendResult(interp, "90 rotate\n", NULL);
}
sprintf(string, "%.4g %.4g scale\n", psInfo.scale, psInfo.scale);
Tcl_AppendResult(interp, string, NULL);
sprintf(string, "%d %d translate\n", deltaX - psInfo.x, deltaY);
Tcl_AppendResult(interp, string, NULL);
sprintf(string,
"%d %.15g moveto %d %.15g lineto %d %.15g lineto %d %.15g",
psInfo.x, Tk_PostscriptY((double)psInfo.y,
(Tk_PostscriptInfo)psInfoPtr),
psInfo.x2, Tk_PostscriptY((double)psInfo.y,
(Tk_PostscriptInfo)psInfoPtr),
psInfo.x2, Tk_PostscriptY((double)psInfo.y2,
(Tk_PostscriptInfo)psInfoPtr),
psInfo.x, Tk_PostscriptY((double)psInfo.y2,
(Tk_PostscriptInfo)psInfoPtr));
Tcl_AppendResult(interp, string,
" lineto closepath clip newpath\n", NULL);
}
if (psInfo.chan != NULL) {
Tcl_Write(psInfo.chan, Tcl_GetStringResult(interp), -1);
Tcl_ResetResult(canvasPtr->interp);
}
/*
* Iterate through all the items, having each relevant one draw itself.
* Quit if any of the items returns an error.
*/
result = TCL_OK;
for (itemPtr = canvasPtr->firstItemPtr; itemPtr != NULL;
itemPtr = itemPtr->nextPtr) {
if ((itemPtr->x1 >= psInfo.x2) || (itemPtr->x2 < psInfo.x)
|| (itemPtr->y1 >= psInfo.y2) || (itemPtr->y2 < psInfo.y)) {
continue;
}
if (itemPtr->typePtr->postscriptProc == NULL) {
continue;
}
if (itemPtr->state == TK_STATE_HIDDEN) {
continue;
}
Tcl_AppendResult(interp, "gsave\n", NULL);
result = (*itemPtr->typePtr->postscriptProc)(interp,
(Tk_Canvas) canvasPtr, itemPtr, 0);
if (result != TCL_OK) {
char msg[64 + TCL_INTEGER_SPACE];
sprintf(msg, "\n (generating Postscript for item %d)",
itemPtr->id);
Tcl_AddErrorInfo(interp, msg);
goto cleanup;
}
Tcl_AppendResult(interp, "grestore\n", NULL);
if (psInfo.chan != NULL) {
Tcl_Write(psInfo.chan, Tcl_GetStringResult(interp), -1);
Tcl_ResetResult(interp);
}
}
/*
* Output page-end information, such as commands to print the page and
* document trailer stuff.
*/
if (psInfo.prolog) {
Tcl_AppendResult(interp, "restore showpage\n\n",
"%%Trailer\nend\n%%EOF\n", NULL);
}
if (psInfo.chan != NULL) {
Tcl_Write(psInfo.chan, Tcl_GetStringResult(interp), -1);
Tcl_ResetResult(canvasPtr->interp);
}
/*
* Clean up psInfo to release malloc'ed stuff.
*/
cleanup:
if (psInfo.pageXString != NULL) {
ckfree(psInfo.pageXString);
}
if (psInfo.pageYString != NULL) {
ckfree(psInfo.pageYString);
}
if (psInfo.pageWidthString != NULL) {
ckfree(psInfo.pageWidthString);
}
if (psInfo.pageHeightString != NULL) {
ckfree(psInfo.pageHeightString);
}
if (psInfo.fontVar != NULL) {
ckfree(psInfo.fontVar);
}
if (psInfo.colorVar != NULL) {
ckfree(psInfo.colorVar);
}
if (psInfo.colorMode != NULL) {
ckfree(psInfo.colorMode);
}
if (psInfo.fileName != NULL) {
ckfree(psInfo.fileName);
}
if ((psInfo.chan != NULL) && (psInfo.channelName == NULL)) {
Tcl_Close(interp, psInfo.chan);
}
if (psInfo.channelName != NULL) {
ckfree(psInfo.channelName);
}
Tcl_DeleteHashTable(&psInfo.fontTable);
canvasPtr->psInfo = (Tk_PostscriptInfo) oldInfoPtr;
return result;
}
/*
*--------------------------------------------------------------
*
* Tk_PostscriptColor --
*
* This function is called by individual canvas items when they want to
* set a color value for output. Given information about an X color, this
* function will generate Postscript commands to set up an appropriate
* color in Postscript.
*
* Results:
* Returns a standard Tcl return value. If an error occurs then an error
* message will be left in the interp's result. If no error occurs, then
* additional Postscript will be appended to the interp's result.
*
* Side effects:
* None.
*
*--------------------------------------------------------------
*/
int
Tk_PostscriptColor(
Tcl_Interp *interp,
Tk_PostscriptInfo psInfo, /* Postscript info. */
XColor *colorPtr) /* Information about color. */
{
TkPostscriptInfo *psInfoPtr = (TkPostscriptInfo *) psInfo;
int tmp;
double red, green, blue;
char string[200];
if (psInfoPtr->prepass) {
return TCL_OK;
}
/*
* If there is a color map defined, then look up the color's name in the
* map and use the Postscript commands found there, if there are any.
*/
if (psInfoPtr->colorVar != NULL) {
const char *cmdString;
cmdString = Tcl_GetVar2(interp, psInfoPtr->colorVar,
Tk_NameOfColor(colorPtr), 0);
if (cmdString != NULL) {
Tcl_AppendResult(interp, cmdString, "\n", NULL);
return TCL_OK;
}
}
/*
* No color map entry for this color. Grab the color's intensities and
* output Postscript commands for them. Special note: X uses a range of
* 0-65535 for intensities, but most displays only use a range of 0-255,
* which maps to (0, 256, 512, ... 65280) in the X scale. This means that
* there's no way to get perfect white, since the highest intensity is
* only 65280 out of 65535. To work around this problem, rescale the X
* intensity to a 0-255 scale and use that as the basis for the Postscript
* colors. This scheme still won't work if the display only uses 4 bits
* per color, but most diplays use at least 8 bits.
*/
tmp = colorPtr->red;
red = ((double) (tmp >> 8))/255.0;
tmp = colorPtr->green;
green = ((double) (tmp >> 8))/255.0;
tmp = colorPtr->blue;
blue = ((double) (tmp >> 8))/255.0;
sprintf(string, "%.3f %.3f %.3f setrgbcolor AdjustColor\n",
red, green, blue);
Tcl_AppendResult(interp, string, NULL);
return TCL_OK;
}
/*
*--------------------------------------------------------------
*
* Tk_PostscriptFont --
*
* This function is called by individual canvas items when they want to
* output text. Given information about an X font, this function will
* generate Postscript commands to set up an appropriate font in
* Postscript.
*
* Results:
* Returns a standard Tcl return value. If an error occurs then an error
* message will be left in the interp's result. If no error occurs, then
* additional Postscript will be appended to the interp's result.
*
* Side effects:
* The Postscript font name is entered into psInfoPtr->fontTable if it
* wasn't already there.
*
*--------------------------------------------------------------
*/
int
Tk_PostscriptFont(
Tcl_Interp *interp,
Tk_PostscriptInfo psInfo, /* Postscript Info. */
Tk_Font tkfont) /* Information about font in which text is to
* be printed. */
{
TkPostscriptInfo *psInfoPtr = (TkPostscriptInfo *) psInfo;
char pointString[TCL_INTEGER_SPACE];
Tcl_DString ds;
int i, points;
/*
* First, look up the font's name in the font map, if there is one. If
* there is an entry for this font, it consists of a list containing font
* name and size. Use this information.
*/
if (psInfoPtr->fontVar != NULL) {
const char *name = Tk_NameOfFont(tkfont);
Tcl_Obj **objv;
int objc;
double size;
Tcl_Obj *list = Tcl_GetVar2Ex(interp, psInfoPtr->fontVar, name, 0);
if (list != NULL) {
const char *fontname;
if (Tcl_ListObjGetElements(interp, list, &objc, &objv) != TCL_OK
|| objc != 2
|| Tcl_GetString(objv[0])[0]=='\0'
|| Tcl_GetDoubleFromObj(interp, objv[1], &size) != TCL_OK
|| size <= 0) {
Tcl_ResetResult(interp);
Tcl_AppendResult(interp, "bad font map entry for \"", name,
"\": \"", Tcl_GetString(list), "\"", NULL);
return TCL_ERROR;
}
fontname = Tcl_GetString(objv[0]);
sprintf(pointString, "%d", (int)size);
Tcl_AppendResult(interp, "/", fontname, " findfont ",
pointString, " scalefont ", NULL);
if (strncasecmp(fontname, "Symbol", 7) != 0) {
Tcl_AppendResult(interp, "ISOEncode ", NULL);
}
Tcl_AppendResult(interp, "setfont\n", NULL);
Tcl_CreateHashEntry(&psInfoPtr->fontTable, fontname, &i);
return TCL_OK;
}
}
/*
* Nothing in the font map, so fall back to the old guessing technique.
*/
Tcl_DStringInit(&ds);
points = Tk_PostscriptFontName(tkfont, &ds);
sprintf(pointString, "%d", points);
Tcl_AppendResult(interp, "/", Tcl_DStringValue(&ds), " findfont ",
pointString, " scalefont ", NULL);
if (strncasecmp(Tcl_DStringValue(&ds), "Symbol", 7) != 0) {
Tcl_AppendResult(interp, "ISOEncode ", NULL);
}
Tcl_AppendResult(interp, "setfont\n", NULL);
Tcl_CreateHashEntry(&psInfoPtr->fontTable, Tcl_DStringValue(&ds), &i);
Tcl_DStringFree(&ds);
return TCL_OK;
}
/*
*--------------------------------------------------------------
*
* Tk_PostscriptBitmap --
*
* This function is called to output the contents of a sub-region of a
* bitmap in proper image data format for Postscript (i.e. data between
* angle brackets, one bit per pixel).
*
* Results:
* Returns a standard Tcl return value. If an error occurs then an error
* message will be left in the interp's result. If no error occurs, then
* additional Postscript will be appended to the interp's result.
*
* Side effects:
* None.
*
*--------------------------------------------------------------
*/
int
Tk_PostscriptBitmap(
Tcl_Interp *interp,
Tk_Window tkwin,
Tk_PostscriptInfo psInfo, /* Postscript info. */
Pixmap bitmap, /* Bitmap for which to generate Postscript. */
int startX, int startY, /* Coordinates of upper-left corner of
* rectangular region to output. */
int width, int height) /* Height of rectangular region. */
{
TkPostscriptInfo *psInfoPtr = (TkPostscriptInfo *) psInfo;
XImage *imagePtr;
int charsInLine, x, y, lastX, lastY, value, mask;
unsigned int totalWidth, totalHeight;
char string[100];
Window dummyRoot;
int dummyX, dummyY;
unsigned dummyBorderwidth, dummyDepth;
if (psInfoPtr->prepass) {
return TCL_OK;
}
/*
* The following call should probably be a call to Tk_SizeOfBitmap
* instead, but it seems that we are occasionally invoked by custom item
* types that create their own bitmaps without registering them with Tk.
* XGetGeometry is a bit slower than Tk_SizeOfBitmap, but it shouldn't
* matter here.
*/
XGetGeometry(Tk_Display(tkwin), bitmap, &dummyRoot,
(int *) &dummyX, (int *) &dummyY, (unsigned int *) &totalWidth,
(unsigned int *) &totalHeight, &dummyBorderwidth, &dummyDepth);
imagePtr = XGetImage(Tk_Display(tkwin), bitmap, 0, 0,
totalWidth, totalHeight, 1, XYPixmap);
Tcl_AppendResult(interp, "<", NULL);
mask = 0x80;
value = 0;
charsInLine = 0;
lastX = startX + width - 1;
lastY = startY + height - 1;
for (y = lastY; y >= startY; y--) {
for (x = startX; x <= lastX; x++) {
if (XGetPixel(imagePtr, x, y)) {
value |= mask;
}
mask >>= 1;
if (mask == 0) {
sprintf(string, "%02x", value);
Tcl_AppendResult(interp, string, NULL);
mask = 0x80;
value = 0;
charsInLine += 2;
if (charsInLine >= 60) {
Tcl_AppendResult(interp, "\n", NULL);
charsInLine = 0;
}
}
}
if (mask != 0x80) {
sprintf(string, "%02x", value);
Tcl_AppendResult(interp, string, NULL);
mask = 0x80;
value = 0;
charsInLine += 2;
}
}
Tcl_AppendResult(interp, ">", NULL);
XDestroyImage(imagePtr);
return TCL_OK;
}
/*
*--------------------------------------------------------------
*
* Tk_PostscriptStipple --
*
* This function is called by individual canvas items when they have
* created a path that they'd like to be filled with a stipple pattern.
* Given information about an X bitmap, this function will generate
* Postscript commands to fill the current clip region using a stipple
* pattern defined by the bitmap.
*
* Results:
* Returns a standard Tcl return value. If an error occurs then an error
* message will be left in the interp's result. If no error occurs, then
* additional Postscript will be appended to the interp's result.
*
* Side effects:
* None.
*
*--------------------------------------------------------------
*/
int
Tk_PostscriptStipple(
Tcl_Interp *interp,
Tk_Window tkwin,
Tk_PostscriptInfo psInfo, /* Interpreter for returning Postscript or
* error message. */
Pixmap bitmap) /* Bitmap to use for stippling. */
{
TkPostscriptInfo *psInfoPtr = (TkPostscriptInfo *) psInfo;
int width, height;
char string[TCL_INTEGER_SPACE * 2];
Window dummyRoot;
int dummyX, dummyY;
unsigned dummyBorderwidth, dummyDepth;
if (psInfoPtr->prepass) {
return TCL_OK;
}
/*
* The following call should probably be a call to Tk_SizeOfBitmap
* instead, but it seems that we are occasionally invoked by custom item
* types that create their own bitmaps without registering them with Tk.
* XGetGeometry is a bit slower than Tk_SizeOfBitmap, but it shouldn't
* matter here.
*/
XGetGeometry(Tk_Display(tkwin), bitmap, &dummyRoot,
(int *) &dummyX, (int *) &dummyY, (unsigned *) &width,
(unsigned *) &height, &dummyBorderwidth, &dummyDepth);
sprintf(string, "%d %d ", width, height);
Tcl_AppendResult(interp, string, NULL);
if (Tk_PostscriptBitmap(interp, tkwin, psInfo, bitmap, 0, 0,
width, height) != TCL_OK) {
return TCL_ERROR;
}
Tcl_AppendResult(interp, " StippleFill\n", NULL);
return TCL_OK;
}
/*
*--------------------------------------------------------------
*
* Tk_PostscriptY --
*
* Given a y-coordinate in local coordinates, this function returns a
* y-coordinate to use for Postscript output. Required because canvases
* have their origin in the top-left, but postscript pages have their
* origin in the bottom left.
*
* Results:
* Returns the Postscript coordinate that corresponds to "y".
*
* Side effects:
* None.
*
*--------------------------------------------------------------
*/
double
Tk_PostscriptY(
double y, /* Y-coordinate in canvas coords. */
Tk_PostscriptInfo psInfo) /* Postscript info */
{
TkPostscriptInfo *psInfoPtr = (TkPostscriptInfo *) psInfo;
return psInfoPtr->y2 - y;
}
/*
*--------------------------------------------------------------
*
* Tk_PostscriptPath --
*
* Given an array of points for a path, generate Postscript commands to
* create the path.
*
* Results:
* Postscript commands get appended to what's in the interp's result.
*
* Side effects:
* None.
*
*--------------------------------------------------------------
*/
void
Tk_PostscriptPath(
Tcl_Interp *interp,
Tk_PostscriptInfo psInfo, /* Canvas on whose behalf Postscript is being
* generated. */
double *coordPtr, /* Pointer to first in array of 2*numPoints
* coordinates giving points for path. */
int numPoints) /* Number of points at *coordPtr. */
{
TkPostscriptInfo *psInfoPtr = (TkPostscriptInfo *) psInfo;
char buffer[200];
if (psInfoPtr->prepass) {
return;
}
sprintf(buffer, "%.15g %.15g moveto\n", coordPtr[0],
Tk_PostscriptY(coordPtr[1], psInfo));
Tcl_AppendResult(interp, buffer, NULL);
for (numPoints--, coordPtr += 2; numPoints > 0;
numPoints--, coordPtr += 2) {
sprintf(buffer, "%.15g %.15g lineto\n", coordPtr[0],
Tk_PostscriptY(coordPtr[1], psInfo));
Tcl_AppendResult(interp, buffer, NULL);
}
}
/*
*--------------------------------------------------------------
*
* GetPostscriptPoints --
*
* Given a string, returns the number of Postscript points corresponding
* to that string.
*
* Results:
* The return value is a standard Tcl return result. If TCL_OK is
* returned, then everything went well and the screen distance is stored
* at *doublePtr; otherwise TCL_ERROR is returned and an error message is
* left in the interp's result.
*
* Side effects:
* None.
*
*--------------------------------------------------------------
*/
static int
GetPostscriptPoints(
Tcl_Interp *interp, /* Use this for error reporting. */
char *string, /* String describing a screen distance. */
double *doublePtr) /* Place to store converted result. */
{
char *end;
double d;
d = strtod(string, &end);
if (end == string) {
goto error;
}
while ((*end != '\0') && isspace(UCHAR(*end))) {
end++;
}
switch (*end) {
case 'c':
d *= 72.0/2.54;
end++;
break;
case 'i':
d *= 72.0;
end++;
break;
case 'm':
d *= 72.0/25.4;
end++;
break;
case 0:
break;
case 'p':
end++;
break;
default:
goto error;
}
while ((*end != '\0') && isspace(UCHAR(*end))) {
end++;
}
if (*end != 0) {
goto error;
}
*doublePtr = d;
return TCL_OK;
error:
Tcl_AppendResult(interp, "bad distance \"", string, "\"", NULL);
return TCL_ERROR;
}
/*
*--------------------------------------------------------------
*
* TkImageGetColor --
*
* This function converts a pixel value to three floating point numbers,
* representing the amount of red, green, and blue in that pixel on the
* screen. It makes use of colormap data passed as an argument, and
* should work for all Visual types.
*
* This implementation is bogus on Windows because the colormap data is
* never filled in. Instead all postscript generated data coming through
* here is expected to be RGB color data. To handle lower bit-depth
* images properly, XQueryColors must be implemented for Windows.
*
* Results:
* Returns red, green, and blue color values in the range 0 to 1. There
* are no error returns.
*
* Side effects:
* None.
*
*--------------------------------------------------------------
*/
#ifdef WIN32
#include <windows.h>
/*
* We could just define these instead of pulling in windows.h.
#define GetRValue(rgb) ((BYTE)(rgb))
#define GetGValue(rgb) ((BYTE)(((WORD)(rgb)) >> 8))
#define GetBValue(rgb) ((BYTE)((rgb)>>16))
*/
#else /* !WIN32 */
#define GetRValue(rgb) ((rgb & cdata->red_mask) >> cdata->red_shift)
#define GetGValue(rgb) ((rgb & cdata->green_mask) >> cdata->green_shift)
#define GetBValue(rgb) ((rgb & cdata->blue_mask) >> cdata->blue_shift)
#endif /* WIN32 */
#if defined(WIN32) || defined(MAC_OSX_TK)
static void
TkImageGetColor(
TkColormapData *cdata, /* Colormap data */
unsigned long pixel, /* Pixel value to look up */
double *red, double *green, double *blue)
/* Color data to return */
{
*red = (double) GetRValue(pixel) / 255.0;
*green = (double) GetGValue(pixel) / 255.0;
*blue = (double) GetBValue(pixel) / 255.0;
}
#else /* ! (WIN32 || MAC_OSX_TK) */
static void
TkImageGetColor(
TkColormapData *cdata, /* Colormap data */
unsigned long pixel, /* Pixel value to look up */
double *red, double *green, double *blue)
/* Color data to return */
{
if (cdata->separated) {
int r = GetRValue(pixel);
int g = GetGValue(pixel);
int b = GetBValue(pixel);
*red = cdata->colors[r].red / 65535.0;
*green = cdata->colors[g].green / 65535.0;
*blue = cdata->colors[b].blue / 65535.0;
} else {
*red = cdata->colors[pixel].red / 65535.0;
*green = cdata->colors[pixel].green / 65535.0;
*blue = cdata->colors[pixel].blue / 65535.0;
}
}
#endif /* WIN32 || MAC_OSX_TK */
/*
*--------------------------------------------------------------
*
* TkPostscriptImage --
*
* This function is called to output the contents of an image in
* Postscript, using a format appropriate for the current color mode
* (i.e. one bit per pixel in monochrome, one byte per pixel in gray, and
* three bytes per pixel in color).
*
* Results:
* Returns a standard Tcl return value. If an error occurs then an error
* message will be left in interp->result. If no error occurs, then
* additional Postscript will be appended to interp->result.
*
* Side effects:
* None.
*
*--------------------------------------------------------------
*/
int
TkPostscriptImage(
Tcl_Interp *interp,
Tk_Window tkwin,
Tk_PostscriptInfo psInfo, /* postscript info */
XImage *ximage, /* Image to draw */
int x, int y, /* First pixel to output */
int width, int height) /* Width and height of area */
{
TkPostscriptInfo *psInfoPtr = (TkPostscriptInfo *) psInfo;
char buffer[256];
int xx, yy, band, maxRows;
double red, green, blue;
int bytesPerLine=0, maxWidth=0;
int level = psInfoPtr->colorLevel;
Colormap cmap;
int i, ncolors;
Visual *visual;
TkColormapData cdata;
if (psInfoPtr->prepass) {
return TCL_OK;
}
cmap = Tk_Colormap(tkwin);
visual = Tk_Visual(tkwin);
/*
* Obtain information about the colormap, ie the mapping between pixel
* values and RGB values. The code below should work for all Visual types.
*/
ncolors = visual->map_entries;
cdata.colors = (XColor *) ckalloc(sizeof(XColor) * ncolors);
cdata.ncolors = ncolors;
if (visual->class == DirectColor || visual->class == TrueColor) {
cdata.separated = 1;
cdata.red_mask = visual->red_mask;
cdata.green_mask = visual->green_mask;
cdata.blue_mask = visual->blue_mask;
cdata.red_shift = 0;
cdata.green_shift = 0;
cdata.blue_shift = 0;
while ((0x0001 & (cdata.red_mask >> cdata.red_shift)) == 0) {
cdata.red_shift ++;
}
while ((0x0001 & (cdata.green_mask >> cdata.green_shift)) == 0) {
cdata.green_shift ++;
}
while ((0x0001 & (cdata.blue_mask >> cdata.blue_shift)) == 0) {
cdata.blue_shift ++;
}
for (i = 0; i < ncolors; i ++) {
cdata.colors[i].pixel =
((i << cdata.red_shift) & cdata.red_mask) |
((i << cdata.green_shift) & cdata.green_mask) |
((i << cdata.blue_shift) & cdata.blue_mask);
}
} else {
cdata.separated=0;
for (i = 0; i < ncolors; i ++) {
cdata.colors[i].pixel = i;
}
}
if (visual->class == StaticGray || visual->class == GrayScale) {
cdata.color = 0;
} else {
cdata.color = 1;
}
XQueryColors(Tk_Display(tkwin), cmap, cdata.colors, ncolors);
/*
* Figure out which color level to use (possibly lower than the one
* specified by the user). For example, if the user specifies color with
* monochrome screen, use gray or monochrome mode instead.
*/
if (!cdata.color && level == 2) {
level = 1;
}
if (!cdata.color && cdata.ncolors == 2) {
level = 0;
}
/*
* Check that at least one row of the image can be represented with a
* string less than 64 KB long (this is a limit in the Postscript
* interpreter).
*/
switch (level) {
case 0: bytesPerLine = (width + 7) / 8; maxWidth = 240000; break;
case 1: bytesPerLine = width; maxWidth = 60000; break;
case 2: bytesPerLine = 3 * width; maxWidth = 20000; break;
}
if (bytesPerLine > 60000) {
Tcl_ResetResult(interp);
sprintf(buffer,
"Can't generate Postscript for images more than %d pixels wide",
maxWidth);
Tcl_AppendResult(interp, buffer, NULL);
ckfree((char *) cdata.colors);
return TCL_ERROR;
}
maxRows = 60000 / bytesPerLine;
for (band = height-1; band >= 0; band -= maxRows) {
int rows = (band >= maxRows) ? maxRows : band + 1;
int lineLen = 0;
switch (level) {
case 0:
sprintf(buffer, "%d %d 1 matrix {\n<", width, rows);
Tcl_AppendResult(interp, buffer, NULL);
break;
case 1:
sprintf(buffer, "%d %d 8 matrix {\n<", width, rows);
Tcl_AppendResult(interp, buffer, NULL);
break;
case 2:
sprintf(buffer, "%d %d 8 matrix {\n<", width, rows);
Tcl_AppendResult(interp, buffer, NULL);
break;
}
for (yy = band; yy > band - rows; yy--) {
switch (level) {
case 0: {
/*
* Generate data for image in monochrome mode. No attempt at
* dithering is made--instead, just set a threshold.
*/
unsigned char mask = 0x80;
unsigned char data = 0x00;
for (xx = x; xx< x+width; xx++) {
TkImageGetColor(&cdata, XGetPixel(ximage, xx, yy),
&red, &green, &blue);
if (0.30 * red + 0.59 * green + 0.11 * blue > 0.5) {
data |= mask;
}
mask >>= 1;
if (mask == 0) {
sprintf(buffer, "%02X", data);
Tcl_AppendResult(interp, buffer, NULL);
lineLen += 2;
if (lineLen > 60) {
lineLen = 0;
Tcl_AppendResult(interp, "\n", NULL);
}
mask=0x80;
data=0x00;
}
}
if ((width % 8) != 0) {
sprintf(buffer, "%02X", data);
Tcl_AppendResult(interp, buffer, NULL);
mask=0x80;
data=0x00;
}
break;
}
case 1:
/*
* Generate data in gray mode; in this case, take a weighted
* sum of the red, green, and blue values.
*/
for (xx = x; xx < x+width; xx ++) {
TkImageGetColor(&cdata, XGetPixel(ximage, xx, yy),
&red, &green, &blue);
sprintf(buffer, "%02X", (int) floor(0.5 + 255.0 *
(0.30 * red + 0.59 * green + 0.11 * blue)));
Tcl_AppendResult(interp, buffer, NULL);
lineLen += 2;
if (lineLen > 60) {
lineLen = 0;
Tcl_AppendResult(interp, "\n", NULL);
}
}
break;
case 2:
/*
* Finally, color mode. Here, just output the red, green, and
* blue values directly.
*/
for (xx = x; xx < x+width; xx++) {
TkImageGetColor(&cdata, XGetPixel(ximage, xx, yy),
&red, &green, &blue);
sprintf(buffer, "%02X%02X%02X",
(int) floor(0.5 + 255.0 * red),
(int) floor(0.5 + 255.0 * green),
(int) floor(0.5 + 255.0 * blue));
Tcl_AppendResult(interp, buffer, NULL);
lineLen += 6;
if (lineLen > 60) {
lineLen = 0;
Tcl_AppendResult(interp, "\n", NULL);
}
}
break;
}
}
switch (level) {
case 0: case 1:
sprintf(buffer, ">\n} image\n"); break;
case 2:
sprintf(buffer, ">\n} false 3 colorimage\n"); break;
}
Tcl_AppendResult(interp, buffer, NULL);
sprintf(buffer, "0 %d translate\n", rows);
Tcl_AppendResult(interp, buffer, NULL);
}
ckfree((char *) cdata.colors);
return TCL_OK;
}
/*
*--------------------------------------------------------------
*
* Tk_PostscriptPhoto --
*
* This function is called to output the contents of a photo image in
* Postscript, using a format appropriate for the requested postscript
* color mode (i.e. one byte per pixel in gray, and three bytes per pixel
* in color).
*
* Results:
* Returns a standard Tcl return value. If an error occurs then an error
* message will be left in interp->result. If no error occurs, then
* additional Postscript will be appended to the interpreter's result.
*
* Side effects:
* None.
*
*--------------------------------------------------------------
*/
int
Tk_PostscriptPhoto(
Tcl_Interp *interp,
Tk_PhotoImageBlock *blockPtr,
Tk_PostscriptInfo psInfo,
int width, int height)
{
TkPostscriptInfo *psInfoPtr = (TkPostscriptInfo *) psInfo;
int colorLevel = psInfoPtr->colorLevel;
static int codeIncluded = 0;
unsigned char *pixelPtr;
char buffer[256], cspace[40], decode[40];
int bpc;
int xx, yy, lineLen;
float red, green, blue;
int alpha;
int bytesPerLine=0, maxWidth=0;
unsigned char opaque = 255;
unsigned char *alphaPtr;
int alphaOffset, alphaPitch, alphaIncr;
if (psInfoPtr->prepass) {
codeIncluded = 0;
return TCL_OK;
}
/*
* Define the "TkPhoto" function, which is a modified version of the
* original "transparentimage" function posted by ian@five-d.com (Ian
* Kemmish) to comp.lang.postscript. For a monochrome colorLevel this is a
* slightly different version that uses the imagemask command instead of
* image.
*/
if (!codeIncluded && (colorLevel != 0)) {
/*
* Color and gray-scale code.
*/
codeIncluded = !0;
Tcl_AppendResult(interp,
"/TkPhoto { \n",
" gsave \n",
" 32 dict begin \n",
" /tinteger exch def \n",
" /transparent 1 string def \n",
" transparent 0 tinteger put \n",
" /olddict exch def \n",
" olddict /DataSource get dup type /filetype ne { \n",
" olddict /DataSource 3 -1 roll \n",
" 0 () /SubFileDecode filter put \n",
" } { \n",
" pop \n",
" } ifelse \n",
" /newdict olddict maxlength dict def \n",
" olddict newdict copy pop \n",
" /w newdict /Width get def \n",
" /crpp newdict /Decode get length 2 idiv def \n",
" /str w string def \n",
" /pix w crpp mul string def \n",
" /substrlen 2 w log 2 log div floor exp cvi def \n",
" /substrs [ \n",
" { \n",
" substrlen string \n",
" 0 1 substrlen 1 sub { \n",
" 1 index exch tinteger put \n",
" } for \n",
" /substrlen substrlen 2 idiv def \n",
" substrlen 0 eq {exit} if \n",
" } loop \n",
" ] def \n",
" /h newdict /Height get def \n",
" 1 w div 1 h div matrix scale \n",
" olddict /ImageMatrix get exch matrix concatmatrix \n",
" matrix invertmatrix concat \n",
" newdict /Height 1 put \n",
" newdict /DataSource pix put \n",
" /mat [w 0 0 h 0 0] def \n",
" newdict /ImageMatrix mat put \n",
" 0 1 h 1 sub { \n",
" mat 5 3 -1 roll neg put \n",
" olddict /DataSource get str readstring pop pop \n",
" /tail str def \n",
" /x 0 def \n",
" olddict /DataSource get pix readstring pop pop \n",
" { \n",
" tail transparent search dup /done exch not def \n",
" {exch pop exch pop} if \n",
" /w1 exch length def \n",
" w1 0 ne { \n",
" newdict /DataSource ",
" pix x crpp mul w1 crpp mul getinterval put \n",
" newdict /Width w1 put \n",
" mat 4 x neg put \n",
" /x x w1 add def \n",
" newdict image \n",
" /tail tail w1 tail length w1 sub getinterval def \n",
" } if \n",
" done {exit} if \n",
" tail substrs { \n",
" anchorsearch {pop} if \n",
" } forall \n",
" /tail exch def \n",
" tail length 0 eq {exit} if \n",
" /x w tail length sub def \n",
" } loop \n",
" } for \n",
" end \n",
" grestore \n",
"} bind def \n\n\n", NULL);
} else if (!codeIncluded && (colorLevel == 0)) {
/*
* Monochrome-only code
*/
codeIncluded = !0;
Tcl_AppendResult(interp,
"/TkPhoto { \n",
" gsave \n",
" 32 dict begin \n",
" /dummyInteger exch def \n",
" /olddict exch def \n",
" olddict /DataSource get dup type /filetype ne { \n",
" olddict /DataSource 3 -1 roll \n",
" 0 () /SubFileDecode filter put \n",
" } { \n",
" pop \n",
" } ifelse \n",
" /newdict olddict maxlength dict def \n",
" olddict newdict copy pop \n",
" /w newdict /Width get def \n",
" /pix w 7 add 8 idiv string def \n",
" /h newdict /Height get def \n",
" 1 w div 1 h div matrix scale \n",
" olddict /ImageMatrix get exch matrix concatmatrix \n",
" matrix invertmatrix concat \n",
" newdict /Height 1 put \n",
" newdict /DataSource pix put \n",
" /mat [w 0 0 h 0 0] def \n",
" newdict /ImageMatrix mat put \n",
" 0 1 h 1 sub { \n",
" mat 5 3 -1 roll neg put \n",
" 0.000 0.000 0.000 setrgbcolor \n",
" olddict /DataSource get pix readstring pop pop \n",
" newdict /DataSource pix put \n",
" newdict imagemask \n",
" 1.000 1.000 1.000 setrgbcolor \n",
" olddict /DataSource get pix readstring pop pop \n",
" newdict /DataSource pix put \n",
" newdict imagemask \n",
" } for \n",
" end \n",
" grestore \n",
"} bind def \n\n\n", NULL);
}
/*
* Check that at least one row of the image can be represented with a
* string less than 64 KB long (this is a limit in the Postscript
* interpreter).
*/
switch (colorLevel) {
case 0: bytesPerLine = (width + 7) / 8; maxWidth = 240000; break;
case 1: bytesPerLine = width; maxWidth = 60000; break;
case 2: bytesPerLine = 3 * width; maxWidth = 20000; break;
}
if (bytesPerLine > 60000) {
Tcl_ResetResult(interp);
sprintf(buffer,
"Can't generate Postscript for images more than %d pixels wide",
maxWidth);
Tcl_AppendResult(interp, buffer, NULL);
return TCL_ERROR;
}
/*
* Set up the postscript code except for the image-data stream.
*/
switch (colorLevel) {
case 0:
strcpy(cspace, "/DeviceGray");
strcpy(decode, "[1 0]");
bpc = 1;
break;
case 1:
strcpy(cspace, "/DeviceGray");
strcpy(decode, "[0 1]");
bpc = 8;
break;
default:
strcpy(cspace, "/DeviceRGB");
strcpy(decode, "[0 1 0 1 0 1]");
bpc = 8;
break;
}
Tcl_AppendResult(interp, cspace, " setcolorspace\n\n", NULL);
sprintf(buffer, " /Width %d\n /Height %d\n /BitsPerComponent %d\n",
width, height, bpc);
Tcl_AppendResult(interp, "<<\n /ImageType 1\n", buffer,
" /DataSource currentfile /ASCIIHexDecode filter\n", NULL);
sprintf(buffer, " /ImageMatrix [1 0 0 -1 0 %d]\n", height);
Tcl_AppendResult(interp, buffer, " /Decode ", decode,
"\n>>\n1 TkPhoto\n", NULL);
/*
* Check the PhotoImageBlock information. We assume that:
* if pixelSize is 1,2 or 4, the image is R,G,B,A;
* if pixelSize is 3, the image is R,G,B and offset[3] is bogus.
*/
if (blockPtr->pixelSize == 3) {
/*
* No alpha information: the whole image is opaque.
*/
alphaPtr = &opaque;
alphaPitch = alphaIncr = alphaOffset = 0;
} else {
/*
* Set up alpha handling.
*/
alphaPtr = blockPtr->pixelPtr;
alphaPitch = blockPtr->pitch;
alphaIncr = blockPtr->pixelSize;
alphaOffset = blockPtr->offset[3];
}
for (yy = 0, lineLen=0; yy < height; yy++) {
switch (colorLevel) {
case 0: {
/*
* Generate data for image in monochrome mode. No attempt at
* dithering is made--instead, just set a threshold. To handle
* transparecies we need to output two lines: one for the black
* pixels, one for the white ones.
*/
unsigned char mask = 0x80;
unsigned char data = 0x00;
for (xx = 0; xx< width; xx ++) {
pixelPtr = blockPtr->pixelPtr + (yy * blockPtr->pitch)
+ (xx *blockPtr->pixelSize);
red = pixelPtr[blockPtr->offset[0]];
green = pixelPtr[blockPtr->offset[1]];
blue = pixelPtr[blockPtr->offset[2]];
alpha = *(alphaPtr + (yy * alphaPitch)
+ (xx * alphaIncr) + alphaOffset);
/*
* If pixel is less than threshold, then it is black.
*/
if ((alpha != 0) &&
(0.3086*red + 0.6094*green + 0.082*blue < 128)) {
data |= mask;
}
mask >>= 1;
if (mask == 0) {
sprintf(buffer, "%02X", data);
Tcl_AppendResult(interp, buffer, NULL);
lineLen += 2;
if (lineLen >= 60) {
lineLen = 0;
Tcl_AppendResult(interp, "\n", NULL);
}
mask = 0x80;
data = 0x00;
}
}
if ((width % 8) != 0) {
sprintf(buffer, "%02X", data);
Tcl_AppendResult(interp, buffer, NULL);
mask = 0x80;
data = 0x00;
}
mask = 0x80;
data = 0x00;
for (xx=0 ; xx<width ; xx++) {
pixelPtr = blockPtr->pixelPtr + (yy * blockPtr->pitch)
+ (xx *blockPtr->pixelSize);
red = pixelPtr[blockPtr->offset[0]];
green = pixelPtr[blockPtr->offset[1]];
blue = pixelPtr[blockPtr->offset[2]];
alpha = *(alphaPtr + (yy * alphaPitch)
+ (xx * alphaIncr) + alphaOffset);
/*
* If pixel is greater than threshold, then it is white.
*/
if ((alpha != 0) &&
(0.3086*red + 0.6094*green + 0.082*blue >= 128)) {
data |= mask;
}
mask >>= 1;
if (mask == 0) {
sprintf(buffer, "%02X", data);
Tcl_AppendResult(interp, buffer, NULL);
lineLen += 2;
if (lineLen >= 60) {
lineLen = 0;
Tcl_AppendResult(interp, "\n", NULL);
}
mask = 0x80;
data = 0x00;
}
}
if ((width % 8) != 0) {
sprintf(buffer, "%02X", data);
Tcl_AppendResult(interp, buffer, NULL);
mask = 0x80;
data = 0x00;
}
break;
}
case 1: {
/*
* Generate transparency data. We must prevent a transparent value
* of 0 because of a bug in some HP printers.
*/
for (xx = 0; xx < width; xx ++) {
alpha = *(alphaPtr + (yy * alphaPitch)
+ (xx * alphaIncr) + alphaOffset);
sprintf(buffer, "%02X", alpha | 0x01);
Tcl_AppendResult(interp, buffer, NULL);
lineLen += 2;
if (lineLen >= 60) {
lineLen = 0;
Tcl_AppendResult(interp, "\n", NULL);
}
}
/*
* Generate data in gray mode; in this case, take a weighted sum
* of the red, green, and blue values.
*/
for (xx = 0; xx < width; xx ++) {
pixelPtr = blockPtr->pixelPtr + (yy * blockPtr->pitch)
+ (xx *blockPtr->pixelSize);
red = pixelPtr[blockPtr->offset[0]];
green = pixelPtr[blockPtr->offset[1]];
blue = pixelPtr[blockPtr->offset[2]];
sprintf(buffer, "%02X", (int) floor(0.5 +
( 0.3086 * red + 0.6094 * green + 0.0820 * blue)));
Tcl_AppendResult(interp, buffer, NULL);
lineLen += 2;
if (lineLen >= 60) {
lineLen = 0;
Tcl_AppendResult(interp, "\n", NULL);
}
}
break;
}
default:
/*
* Generate transparency data. We must prevent a transparent value
* of 0 because of a bug in some HP printers.
*/
for (xx = 0; xx < width; xx ++) {
alpha = *(alphaPtr + (yy * alphaPitch)
+ (xx * alphaIncr) + alphaOffset);
sprintf(buffer, "%02X", alpha | 0x01);
Tcl_AppendResult(interp, buffer, NULL);
lineLen += 2;
if (lineLen >= 60) {
lineLen = 0;
Tcl_AppendResult(interp, "\n", NULL);
}
}
/*
* Finally, color mode. Here, just output the red, green, and blue
* values directly.
*/
for (xx = 0; xx < width; xx ++) {
pixelPtr = blockPtr->pixelPtr + (yy * blockPtr->pitch)
+ (xx * blockPtr->pixelSize);
sprintf(buffer, "%02X%02X%02X",
pixelPtr[blockPtr->offset[0]],
pixelPtr[blockPtr->offset[1]],
pixelPtr[blockPtr->offset[2]]);
Tcl_AppendResult(interp, buffer, NULL);
lineLen += 6;
if (lineLen >= 60) {
lineLen = 0;
Tcl_AppendResult(interp, "\n", NULL);
}
}
break;
}
}
Tcl_AppendResult(interp, ">\n", NULL);
return TCL_OK;
}
/*
* Local Variables:
* mode: c
* c-basic-offset: 4
* fill-column: 78
* End:
*/