| 1 |
/* $Header: /cvsroot/esrg/sfesrg/esrgpcpj/shared/tk_base/tkimgppm.c,v 1.1.1.1 2001/06/13 05:03:30 dtashley Exp $ */
|
| 2 |
|
| 3 |
/*
|
| 4 |
* tkImgPPM.c --
|
| 5 |
*
|
| 6 |
* A photo image file handler for PPM (Portable PixMap) files.
|
| 7 |
*
|
| 8 |
* Copyright (c) 1994 The Australian National University.
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| 9 |
* Copyright (c) 1994-1997 Sun Microsystems, Inc.
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| 10 |
*
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| 11 |
* See the file "license.terms" for information on usage and redistribution
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| 12 |
* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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| 13 |
*
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| 14 |
* Author: Paul Mackerras (paulus@cs.anu.edu.au),
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| 15 |
* Department of Computer Science,
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| 16 |
* Australian National University.
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| 17 |
*
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| 18 |
* RCS: @(#) $Id: tkimgppm.c,v 1.1.1.1 2001/06/13 05:03:30 dtashley Exp $
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| 19 |
*/
|
| 20 |
|
| 21 |
#define USE_OLD_IMAGE
|
| 22 |
|
| 23 |
#include "tkInt.h"
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| 24 |
#include "tkPort.h"
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| 25 |
|
| 26 |
/*
|
| 27 |
* The maximum amount of memory to allocate for data read from the
|
| 28 |
* file. If we need more than this, we do it in pieces.
|
| 29 |
*/
|
| 30 |
|
| 31 |
#define MAX_MEMORY 10000 /* don't allocate > 10KB */
|
| 32 |
|
| 33 |
/*
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| 34 |
* Define PGM and PPM, i.e. gray images and color images.
|
| 35 |
*/
|
| 36 |
|
| 37 |
#define PGM 1
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| 38 |
#define PPM 2
|
| 39 |
|
| 40 |
/*
|
| 41 |
* The format record for the PPM file format:
|
| 42 |
*/
|
| 43 |
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| 44 |
static int FileMatchPPM _ANSI_ARGS_((Tcl_Channel chan,
|
| 45 |
char *fileName, char *formatString,
|
| 46 |
int *widthPtr, int *heightPtr));
|
| 47 |
static int FileReadPPM _ANSI_ARGS_((Tcl_Interp *interp,
|
| 48 |
Tcl_Channel chan, char *fileName,
|
| 49 |
char *formatString, Tk_PhotoHandle imageHandle,
|
| 50 |
int destX, int destY, int width, int height,
|
| 51 |
int srcX, int srcY));
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| 52 |
static int FileWritePPM _ANSI_ARGS_((Tcl_Interp *interp,
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| 53 |
char *fileName, char *formatString,
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| 54 |
Tk_PhotoImageBlock *blockPtr));
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| 55 |
|
| 56 |
Tk_PhotoImageFormat tkImgFmtPPM = {
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| 57 |
"PPM", /* name */
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| 58 |
FileMatchPPM, /* fileMatchProc */
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| 59 |
NULL, /* stringMatchProc */
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| 60 |
FileReadPPM, /* fileReadProc */
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| 61 |
NULL, /* stringReadProc */
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| 62 |
FileWritePPM, /* fileWriteProc */
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| 63 |
NULL, /* stringWriteProc */
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| 64 |
};
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| 65 |
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| 66 |
/*
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| 67 |
* Prototypes for local procedures defined in this file:
|
| 68 |
*/
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| 69 |
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| 70 |
static int ReadPPMFileHeader _ANSI_ARGS_((Tcl_Channel chan,
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| 71 |
int *widthPtr, int *heightPtr,
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| 72 |
int *maxIntensityPtr));
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| 73 |
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| 74 |
/*
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| 75 |
*----------------------------------------------------------------------
|
| 76 |
*
|
| 77 |
* FileMatchPPM --
|
| 78 |
*
|
| 79 |
* This procedure is invoked by the photo image type to see if
|
| 80 |
* a file contains image data in PPM format.
|
| 81 |
*
|
| 82 |
* Results:
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| 83 |
* The return value is >0 if the first characters in file "f" look
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| 84 |
* like PPM data, and 0 otherwise.
|
| 85 |
*
|
| 86 |
* Side effects:
|
| 87 |
* The access position in f may change.
|
| 88 |
*
|
| 89 |
*----------------------------------------------------------------------
|
| 90 |
*/
|
| 91 |
|
| 92 |
static int
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| 93 |
FileMatchPPM(chan, fileName, formatString, widthPtr, heightPtr)
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| 94 |
Tcl_Channel chan; /* The image file, open for reading. */
|
| 95 |
char *fileName; /* The name of the image file. */
|
| 96 |
char *formatString; /* User-specified format string, or NULL. */
|
| 97 |
int *widthPtr, *heightPtr; /* The dimensions of the image are
|
| 98 |
* returned here if the file is a valid
|
| 99 |
* raw PPM file. */
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| 100 |
{
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| 101 |
int dummy;
|
| 102 |
|
| 103 |
return ReadPPMFileHeader(chan, widthPtr, heightPtr, &dummy);
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| 104 |
}
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| 105 |
|
| 106 |
/*
|
| 107 |
*----------------------------------------------------------------------
|
| 108 |
*
|
| 109 |
* FileReadPPM --
|
| 110 |
*
|
| 111 |
* This procedure is called by the photo image type to read
|
| 112 |
* PPM format data from a file and write it into a given
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| 113 |
* photo image.
|
| 114 |
*
|
| 115 |
* Results:
|
| 116 |
* A standard TCL completion code. If TCL_ERROR is returned
|
| 117 |
* then an error message is left in the interp's result.
|
| 118 |
*
|
| 119 |
* Side effects:
|
| 120 |
* The access position in file f is changed, and new data is
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| 121 |
* added to the image given by imageHandle.
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| 122 |
*
|
| 123 |
*----------------------------------------------------------------------
|
| 124 |
*/
|
| 125 |
|
| 126 |
static int
|
| 127 |
FileReadPPM(interp, chan, fileName, formatString, imageHandle, destX, destY,
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| 128 |
width, height, srcX, srcY)
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| 129 |
Tcl_Interp *interp; /* Interpreter to use for reporting errors. */
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| 130 |
Tcl_Channel chan; /* The image file, open for reading. */
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| 131 |
char *fileName; /* The name of the image file. */
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| 132 |
char *formatString; /* User-specified format string, or NULL. */
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| 133 |
Tk_PhotoHandle imageHandle; /* The photo image to write into. */
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| 134 |
int destX, destY; /* Coordinates of top-left pixel in
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| 135 |
* photo image to be written to. */
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| 136 |
int width, height; /* Dimensions of block of photo image to
|
| 137 |
* be written to. */
|
| 138 |
int srcX, srcY; /* Coordinates of top-left pixel to be used
|
| 139 |
* in image being read. */
|
| 140 |
{
|
| 141 |
int fileWidth, fileHeight, maxIntensity;
|
| 142 |
int nLines, nBytes, h, type, count;
|
| 143 |
unsigned char *pixelPtr;
|
| 144 |
Tk_PhotoImageBlock block;
|
| 145 |
|
| 146 |
type = ReadPPMFileHeader(chan, &fileWidth, &fileHeight, &maxIntensity);
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| 147 |
if (type == 0) {
|
| 148 |
Tcl_AppendResult(interp, "couldn't read raw PPM header from file \"",
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| 149 |
fileName, "\"", NULL);
|
| 150 |
return TCL_ERROR;
|
| 151 |
}
|
| 152 |
if ((fileWidth <= 0) || (fileHeight <= 0)) {
|
| 153 |
Tcl_AppendResult(interp, "PPM image file \"", fileName,
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| 154 |
"\" has dimension(s) <= 0", (char *) NULL);
|
| 155 |
return TCL_ERROR;
|
| 156 |
}
|
| 157 |
if ((maxIntensity <= 0) || (maxIntensity >= 256)) {
|
| 158 |
char buffer[TCL_INTEGER_SPACE];
|
| 159 |
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| 160 |
sprintf(buffer, "%d", maxIntensity);
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| 161 |
Tcl_AppendResult(interp, "PPM image file \"", fileName,
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| 162 |
"\" has bad maximum intensity value ", buffer,
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| 163 |
(char *) NULL);
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| 164 |
return TCL_ERROR;
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}
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| 166 |
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| 167 |
if ((srcX + width) > fileWidth) {
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| 168 |
width = fileWidth - srcX;
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| 169 |
}
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| 170 |
if ((srcY + height) > fileHeight) {
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height = fileHeight - srcY;
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| 172 |
}
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| 173 |
if ((width <= 0) || (height <= 0)
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| 174 |
|| (srcX >= fileWidth) || (srcY >= fileHeight)) {
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| 175 |
return TCL_OK;
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| 176 |
}
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| 177 |
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| 178 |
if (type == PGM) {
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| 179 |
block.pixelSize = 1;
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| 180 |
block.offset[0] = 0;
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block.offset[1] = 0;
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| 182 |
block.offset[2] = 0;
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| 183 |
}
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else {
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| 185 |
block.pixelSize = 3;
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| 186 |
block.offset[0] = 0;
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| 187 |
block.offset[1] = 1;
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| 188 |
block.offset[2] = 2;
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| 189 |
}
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| 190 |
block.offset[3] = 0;
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| 191 |
block.width = width;
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| 192 |
block.pitch = block.pixelSize * fileWidth;
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| 193 |
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| 194 |
Tk_PhotoExpand(imageHandle, destX + width, destY + height);
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| 195 |
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| 196 |
if (srcY > 0) {
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| 197 |
Tcl_Seek(chan, (srcY * block.pitch), SEEK_CUR);
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| 198 |
}
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| 199 |
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| 200 |
nLines = (MAX_MEMORY + block.pitch - 1) / block.pitch;
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| 201 |
if (nLines > height) {
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| 202 |
nLines = height;
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| 203 |
}
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| 204 |
if (nLines <= 0) {
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| 205 |
nLines = 1;
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| 206 |
}
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| 207 |
nBytes = nLines * block.pitch;
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| 208 |
pixelPtr = (unsigned char *) ckalloc((unsigned) nBytes);
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| 209 |
block.pixelPtr = pixelPtr + srcX * block.pixelSize;
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| 210 |
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| 211 |
for (h = height; h > 0; h -= nLines) {
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| 212 |
if (nLines > h) {
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| 213 |
nLines = h;
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nBytes = nLines * block.pitch;
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| 215 |
}
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| 216 |
count = Tcl_Read(chan, (char *) pixelPtr, nBytes);
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| 217 |
if (count != nBytes) {
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| 218 |
Tcl_AppendResult(interp, "error reading PPM image file \"",
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| 219 |
fileName, "\": ",
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| 220 |
Tcl_Eof(chan) ? "not enough data" : Tcl_PosixError(interp),
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| 221 |
(char *) NULL);
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| 222 |
ckfree((char *) pixelPtr);
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| 223 |
return TCL_ERROR;
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}
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| 225 |
if (maxIntensity != 255) {
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| 226 |
unsigned char *p;
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| 227 |
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| 228 |
for (p = pixelPtr; count > 0; count--, p++) {
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| 229 |
*p = (((int) *p) * 255)/maxIntensity;
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| 230 |
}
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| 231 |
}
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| 232 |
block.height = nLines;
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| 233 |
Tk_PhotoPutBlock(imageHandle, &block, destX, destY, width, nLines);
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| 234 |
destY += nLines;
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| 235 |
}
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| 236 |
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| 237 |
ckfree((char *) pixelPtr);
|
| 238 |
return TCL_OK;
|
| 239 |
}
|
| 240 |
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| 241 |
/*
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| 242 |
*----------------------------------------------------------------------
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| 243 |
*
|
| 244 |
* FileWritePPM --
|
| 245 |
*
|
| 246 |
* This procedure is invoked to write image data to a file in PPM
|
| 247 |
* format.
|
| 248 |
*
|
| 249 |
* Results:
|
| 250 |
* A standard TCL completion code. If TCL_ERROR is returned
|
| 251 |
* then an error message is left in the interp's result.
|
| 252 |
*
|
| 253 |
* Side effects:
|
| 254 |
* Data is written to the file given by "fileName".
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| 255 |
*
|
| 256 |
*----------------------------------------------------------------------
|
| 257 |
*/
|
| 258 |
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| 259 |
static int
|
| 260 |
FileWritePPM(interp, fileName, formatString, blockPtr)
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| 261 |
Tcl_Interp *interp;
|
| 262 |
char *fileName;
|
| 263 |
char *formatString;
|
| 264 |
Tk_PhotoImageBlock *blockPtr;
|
| 265 |
{
|
| 266 |
Tcl_Channel chan;
|
| 267 |
int w, h;
|
| 268 |
int greenOffset, blueOffset, nBytes;
|
| 269 |
unsigned char *pixelPtr, *pixLinePtr;
|
| 270 |
char header[16 + TCL_INTEGER_SPACE * 2];
|
| 271 |
|
| 272 |
chan = Tcl_OpenFileChannel(interp, fileName, "w", 0666);
|
| 273 |
if (chan == NULL) {
|
| 274 |
return TCL_ERROR;
|
| 275 |
}
|
| 276 |
|
| 277 |
if (Tcl_SetChannelOption(interp, chan, "-translation", "binary")
|
| 278 |
!= TCL_OK) {
|
| 279 |
return TCL_ERROR;
|
| 280 |
}
|
| 281 |
if (Tcl_SetChannelOption(interp, chan, "-encoding", "binary")
|
| 282 |
!= TCL_OK) {
|
| 283 |
return TCL_ERROR;
|
| 284 |
}
|
| 285 |
|
| 286 |
sprintf(header, "P6\n%d %d\n255\n", blockPtr->width, blockPtr->height);
|
| 287 |
Tcl_Write(chan, header, -1);
|
| 288 |
|
| 289 |
pixLinePtr = blockPtr->pixelPtr + blockPtr->offset[0];
|
| 290 |
greenOffset = blockPtr->offset[1] - blockPtr->offset[0];
|
| 291 |
blueOffset = blockPtr->offset[2] - blockPtr->offset[0];
|
| 292 |
|
| 293 |
if ((greenOffset == 1) && (blueOffset == 2) && (blockPtr->pixelSize == 3)
|
| 294 |
&& (blockPtr->pitch == (blockPtr->width * 3))) {
|
| 295 |
nBytes = blockPtr->height * blockPtr->pitch;
|
| 296 |
if (Tcl_Write(chan, (char *) pixLinePtr, nBytes) != nBytes) {
|
| 297 |
goto writeerror;
|
| 298 |
}
|
| 299 |
} else {
|
| 300 |
for (h = blockPtr->height; h > 0; h--) {
|
| 301 |
pixelPtr = pixLinePtr;
|
| 302 |
for (w = blockPtr->width; w > 0; w--) {
|
| 303 |
if ((Tcl_Write(chan, (char *) &pixelPtr[0], 1) == -1)
|
| 304 |
|| (Tcl_Write(chan, (char *) &pixelPtr[greenOffset], 1) == -1)
|
| 305 |
|| (Tcl_Write(chan, (char *) &pixelPtr[blueOffset], 1) == -1)) {
|
| 306 |
goto writeerror;
|
| 307 |
}
|
| 308 |
pixelPtr += blockPtr->pixelSize;
|
| 309 |
}
|
| 310 |
pixLinePtr += blockPtr->pitch;
|
| 311 |
}
|
| 312 |
}
|
| 313 |
|
| 314 |
if (Tcl_Close(NULL, chan) == 0) {
|
| 315 |
return TCL_OK;
|
| 316 |
}
|
| 317 |
chan = NULL;
|
| 318 |
|
| 319 |
writeerror:
|
| 320 |
Tcl_AppendResult(interp, "error writing \"", fileName, "\": ",
|
| 321 |
Tcl_PosixError(interp), (char *) NULL);
|
| 322 |
if (chan != NULL) {
|
| 323 |
Tcl_Close(NULL, chan);
|
| 324 |
}
|
| 325 |
return TCL_ERROR;
|
| 326 |
}
|
| 327 |
|
| 328 |
/*
|
| 329 |
*----------------------------------------------------------------------
|
| 330 |
*
|
| 331 |
* ReadPPMFileHeader --
|
| 332 |
*
|
| 333 |
* This procedure reads the PPM header from the beginning of a
|
| 334 |
* PPM file and returns information from the header.
|
| 335 |
*
|
| 336 |
* Results:
|
| 337 |
* The return value is PGM if file "f" appears to start with
|
| 338 |
* a valid PGM header, PPM if "f" appears to start with a valid
|
| 339 |
* PPM header, and 0 otherwise. If the header is valid,
|
| 340 |
* then *widthPtr and *heightPtr are modified to hold the
|
| 341 |
* dimensions of the image and *maxIntensityPtr is modified to
|
| 342 |
* hold the value of a "fully on" intensity value.
|
| 343 |
*
|
| 344 |
* Side effects:
|
| 345 |
* The access position in f advances.
|
| 346 |
*
|
| 347 |
*----------------------------------------------------------------------
|
| 348 |
*/
|
| 349 |
|
| 350 |
static int
|
| 351 |
ReadPPMFileHeader(chan, widthPtr, heightPtr, maxIntensityPtr)
|
| 352 |
Tcl_Channel chan; /* Image file to read the header from */
|
| 353 |
int *widthPtr, *heightPtr; /* The dimensions of the image are
|
| 354 |
* returned here. */
|
| 355 |
int *maxIntensityPtr; /* The maximum intensity value for
|
| 356 |
* the image is stored here. */
|
| 357 |
{
|
| 358 |
#define BUFFER_SIZE 1000
|
| 359 |
char buffer[BUFFER_SIZE];
|
| 360 |
int i, numFields;
|
| 361 |
int type = 0;
|
| 362 |
char c;
|
| 363 |
|
| 364 |
/*
|
| 365 |
* Read 4 space-separated fields from the file, ignoring
|
| 366 |
* comments (any line that starts with "#").
|
| 367 |
*/
|
| 368 |
|
| 369 |
if (Tcl_Read(chan, &c, 1) != 1) {
|
| 370 |
return 0;
|
| 371 |
}
|
| 372 |
i = 0;
|
| 373 |
for (numFields = 0; numFields < 4; numFields++) {
|
| 374 |
/*
|
| 375 |
* Skip comments and white space.
|
| 376 |
*/
|
| 377 |
|
| 378 |
while (1) {
|
| 379 |
while (isspace(UCHAR(c))) {
|
| 380 |
if (Tcl_Read(chan, &c, 1) != 1) {
|
| 381 |
return 0;
|
| 382 |
}
|
| 383 |
}
|
| 384 |
if (c != '#') {
|
| 385 |
break;
|
| 386 |
}
|
| 387 |
do {
|
| 388 |
if (Tcl_Read(chan, &c, 1) != 1) {
|
| 389 |
return 0;
|
| 390 |
}
|
| 391 |
} while (c != '\n');
|
| 392 |
}
|
| 393 |
|
| 394 |
/*
|
| 395 |
* Read a field (everything up to the next white space).
|
| 396 |
*/
|
| 397 |
|
| 398 |
while (!isspace(UCHAR(c))) {
|
| 399 |
if (i < (BUFFER_SIZE-2)) {
|
| 400 |
buffer[i] = c;
|
| 401 |
i++;
|
| 402 |
}
|
| 403 |
if (Tcl_Read(chan, &c, 1) != 1) {
|
| 404 |
goto done;
|
| 405 |
}
|
| 406 |
}
|
| 407 |
if (i < (BUFFER_SIZE-1)) {
|
| 408 |
buffer[i] = ' ';
|
| 409 |
i++;
|
| 410 |
}
|
| 411 |
}
|
| 412 |
done:
|
| 413 |
buffer[i] = 0;
|
| 414 |
|
| 415 |
/*
|
| 416 |
* Parse the fields, which are: id, width, height, maxIntensity.
|
| 417 |
*/
|
| 418 |
|
| 419 |
if (strncmp(buffer, "P6 ", 3) == 0) {
|
| 420 |
type = PPM;
|
| 421 |
} else if (strncmp(buffer, "P5 ", 3) == 0) {
|
| 422 |
type = PGM;
|
| 423 |
} else {
|
| 424 |
return 0;
|
| 425 |
}
|
| 426 |
if (sscanf(buffer+3, "%d %d %d", widthPtr, heightPtr, maxIntensityPtr)
|
| 427 |
!= 3) {
|
| 428 |
return 0;
|
| 429 |
}
|
| 430 |
return type;
|
| 431 |
}
|
| 432 |
|
| 433 |
|
| 434 |
/* $History: tkImgPPM.c $
|
| 435 |
*
|
| 436 |
* ***************** Version 1 *****************
|
| 437 |
* User: Dtashley Date: 1/02/01 Time: 2:53a
|
| 438 |
* Created in $/IjuScripter, IjuConsole/Source/Tk Base
|
| 439 |
* Initial check-in.
|
| 440 |
*/
|
| 441 |
|
| 442 |
/* End of TKIMGPPM.C */ |
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