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|
/* STARTHEADER
*
* File : tga.c
*
* Author : Paul Obermeier (paul@poSoft.de)
*
* Date : Wed Nov 22 21:45:17 CET 2000
*
* Copyright : (C) 2000-2002 Paul Obermeier
*
* Description :
*
* A photo image handler for Truevision's TARGA file format.
*
* The following image types are supported:
*
* 24-bit pixels: True-color (RGB, each channel 8 bit).
* 32-bit pixels: True-color with alpha channel (RGBA, each channel 8 bit).
*
* List of currently supported features:
*
* Type | Read | Write |
* | -file | -data | -file | -data |
* ----------------------------------------
* 24-bit | Yes | Yes | Yes | Yes |
* 32-bit | Yes | Yes | Yes | Yes |
*
* All images types may be either uncompressed (Targa-Type 2) or
* run-length encoded (Targa-Type 10).
*
*
* The following format options are available:
*
* Read TGA image: "tga -matte <bool> -verbose <bool>"
* Write TGA image: "tga -matte <bool> -verbose <bool> -compression <type>"
*
* -matte <bool>: If set to false, a matte (alpha) channel is ignored
* during reading or writing. Default is true.
* -verbose <bool>: If set to true, additional information about the file
* format is printed to stdout. Default is false.
* -compression <type>: Set the compression mode to either "none" or "rle".
* Default is "rle".
*
* Notes:
*
* - As Targa files do not have a "magic number" somewhere in the file header,
* it is difficult to automatically recognize this format.
* Therefore it should be specified as one of the first entries in the list of
* package require tkimg::*.
*
* ENDHEADER
*
* $Id: tga.c,v 1.1.1.1 2016/01/25 21:20:47 joye Exp $
*
*/
/*
* Generic initialization code, parameterized via CPACKAGE and PACKAGE.
*/
#include "init.c"
/* #define DEBUG_LOCAL */
/* Some defines and typedefs. */
#define TRUE 1
#define FALSE 0
typedef unsigned char Boln; /* Boolean value: TRUE or FALSE */
typedef unsigned char UByte; /* Unsigned 8 bit integer */
typedef char Byte; /* Signed 8 bit integer */
typedef short Short; /* Signed 16 bit integer */
typedef int Int; /* Signed 32 bit integer */
/* Supported TARGA version numbers */
#define TGA_RGB_UNCOMP 2
#define TGA_RGB_COMP 10
/* Macros needed for run-length encoding. */
#define TGA_MODE_SAME 0
#define TGA_MODE_DIFF 1
#define MINRUN 3
#define MAXRUN 127
/* Macros for acessing header fields */
#define ENC_LEFT_RIGHT(imgdes) (((imgdes >> 4) & 0x1)? FALSE: TRUE)
#define ENC_TOP_BOTTOM(imgdes) (((imgdes >> 5) & 0x1)? TRUE: FALSE)
#define NCHAN(pixsize) ((pixsize == 24) ? 3: 4)
#define IS_COMPRESSED(imgtyp) ((imgtyp == TGA_RGB_COMP)? TRUE: FALSE)
/* The Targa header structure */
typedef struct {
UByte numid;
UByte maptyp;
UByte imgtyp;
Short maporig;
Short mapsize;
UByte mapbits;
Short xorig;
Short yorig;
Short xsize;
Short ysize;
UByte pixsize;
UByte imgdes;
} TGAHEADER;
/* Structure to hold information about the Targa file being processed. */
typedef struct {
TGAHEADER th;
Int scanrest, /* Number of pixels belonging to next scanline */
scanmode; /* Current compression mode */
UByte *red, /* Pointers to step through scanlines */
*green,
*blue,
*matte;
UByte *redScan, /* Buffer for one scanline: Red channel */
*greenScan, /* Buffer for one scanline: Green channel */
*blueScan, /* Buffer for one scanline: Blue channel */
*matteScan; /* Buffer for one scanline: Matte channel */
UByte *pixbuf;
#ifdef DEBUG_LOCAL
Int total;
#endif
} TGAFILE;
static void tgaClose(TGAFILE *tf)
{
if (tf->redScan) ckfree((char *)tf->redScan);
if (tf->greenScan) ckfree((char *)tf->greenScan);
if (tf->blueScan) ckfree((char *)tf->blueScan);
if (tf->matteScan) ckfree((char *)tf->matteScan);
if (tf->pixbuf) ckfree((char *)tf->pixbuf);
return;
}
static Boln readError(Tcl_Interp *interp)
{
Tcl_AppendResult(interp, "Unexpected end of file", (char *) NULL);
return FALSE;
}
/* This function is commented out because it is not used anywhere
static Boln writeError(Tcl_Interp *interp)
{
Tcl_AppendResult(interp, "Error writing to file", (char *) NULL);
return FALSE;
}
*/
/* Read 1 byte, representing an unsigned integer number. */
static Boln readUByte (tkimg_MFile *handle, UByte *b)
{
char buf[1];
if (1 != tkimg_Read(handle, buf, 1))
return FALSE;
*b = buf[0];
return TRUE;
}
/* Read 2 bytes, representing a short integer in the form <LowByte, HighByte>,
from a file and convert them into the current machine's format. */
static Boln readShort (tkimg_MFile *handle, Short *s)
{
char buf[2];
if (2 != tkimg_Read(handle, buf, 2))
return FALSE;
*s = (buf[0] & 0xFF) | (buf[1] << 8);
return TRUE;
}
/* Write a byte, representing an unsigned integer to a file. */
static Boln writeUByte (tkimg_MFile *handle, UByte b)
{
UByte buf[1];
buf[0] = b;
if (1 != tkimg_Write(handle, (const char *)buf, 1))
return FALSE;
return TRUE;
}
/* Write a byte, representing a signed integer to a file. */
static Boln writeByte(tkimg_MFile *handle, Byte b)
{
Byte buf[1];
buf[0] = b;
if (1 != tkimg_Write(handle, buf, 1))
return FALSE;
return TRUE;
}
/* Convert a short integer number into the format <LowByte, HighByte> (an array
of 2 bytes) and write the array to a file. */
static Boln writeShort (tkimg_MFile *handle, Short s)
{
Byte buf[2];
buf[0] = s;
buf[1] = s >> 8;
if (2 != tkimg_Write(handle, buf, 2))
return FALSE;
return TRUE;
}
#define OUT Tcl_WriteChars (outChan, str, -1)
static void printImgInfo (TGAHEADER *th, const char *filename, const char *msg)
{
Tcl_Channel outChan;
char str[256];
outChan = Tcl_GetStdChannel (TCL_STDOUT);
if (!outChan) {
return;
}
sprintf(str, "%s %s\n", msg, filename); OUT;
sprintf(str, "\tSize in pixel : %d x %d\n", th->xsize, th->ysize); OUT;
sprintf(str, "\tNo. of channels : %d\n", NCHAN(th->pixsize)); OUT;
sprintf(str, "\tCompression : %s\n",
IS_COMPRESSED(th->imgtyp)? "RLE": "None"); OUT;
sprintf(str, "\tVertical encoding : %s\n",
ENC_TOP_BOTTOM(th->imgdes)? "Top -> Bottom": "Bottom -> Top"); OUT;
sprintf(str, "\tHorizontal encoding: %s\n",
ENC_LEFT_RIGHT(th->imgdes)? "Left -> Right": "Right -> Left"); OUT;
Tcl_Flush(outChan);
}
#undef OUT
static Boln readHeader (tkimg_MFile *handle, TGAHEADER *th)
{
Int i;
UByte dummy;
if (!readUByte (handle, &th->numid) ||
!readUByte (handle, &th->maptyp) ||
!readUByte (handle, &th->imgtyp) ||
!readShort (handle, &th->maporig) ||
!readShort (handle, &th->mapsize) ||
!readUByte (handle, &th->mapbits) ||
!readShort (handle, &th->xorig) ||
!readShort (handle, &th->yorig) ||
!readShort (handle, &th->xsize) ||
!readShort (handle, &th->ysize) ||
!readUByte (handle, &th->pixsize) ||
!readUByte (handle, &th->imgdes))
return FALSE;
/* Try to find out if this file can possibly be a TARGA pixel file. */
if (!((th->imgtyp == TGA_RGB_UNCOMP || th->imgtyp == TGA_RGB_COMP) &&
(th->pixsize == 24 || th->pixsize == 32))) {
return FALSE;
}
for ( i=0; i<th->numid; i++) {
if (!readUByte (handle, &dummy))
return FALSE;
}
if (th->xsize < 1 || th->ysize < 1) {
return FALSE;
}
/* Skip colormap data, if present. */
if (th->mapsize > 0)
{ Int mapbytes;
switch (th->mapbits)
{
case 15:
case 16:
mapbytes = 2 * th->mapsize;
break;
case 24:
mapbytes = 3 * th->mapsize;
break;
case 32:
mapbytes = 4 * th->mapsize;
break;
default:
return FALSE;
}
while (mapbytes--)
if (!readUByte (handle, &dummy))
return FALSE;
}
return TRUE;
}
static Boln writeHeader(tkimg_MFile *handle, TGAHEADER *th)
{
if (!writeUByte (handle, th->numid) ||
!writeUByte (handle, th->maptyp) ||
!writeUByte (handle, th->imgtyp) ||
!writeShort (handle, th->maporig) ||
!writeShort (handle, th->mapsize) ||
!writeUByte (handle, th->mapbits) ||
!writeShort (handle, th->xorig) ||
!writeShort (handle, th->yorig) ||
!writeShort (handle, th->xsize) ||
!writeShort (handle, th->ysize) ||
!writeUByte (handle, th->pixsize) ||
!writeUByte (handle, th->imgdes))
return FALSE;
return TRUE;
}
/* A pixel is represented by 3 or 4 bytes in the order Blue/Green/Red/Alpha.
We are converting the order into standard RGBA order.
Note that TARGA allows pixel values to be compressed across scanline
boundaries.
*/
/* Read the value of a pixel from "handle" and assume it must be repeated "n"
times.
*/
static Boln readRlePixel (Tcl_Interp *interp, tkimg_MFile *handle, UByte **pixBufPtr,
Int *countPtr, Int stop, Int n, TGAFILE *tf)
{
Int i, count, nchan;
UByte localBuf[4];
nchan = NCHAN(tf->th.pixsize);
if (nchan != tkimg_Read(handle, (char *)localBuf, nchan))
return readError (interp);
count = *countPtr;
for (i=0; i<n; i++)
{
#ifdef DEBUG_LOCAL
tf->total++;
#endif
(*pixBufPtr)[0] = localBuf[2];
(*pixBufPtr)[1] = localBuf[1];
(*pixBufPtr)[2] = localBuf[0];
if (nchan == 4)
(*pixBufPtr)[3] = localBuf[3];
(*pixBufPtr) += nchan;
count++;
if (count == stop)
{ /* Scanline is filled with pixel values.
Determine the number of pixels to keep for next scanline. */
tf->scanrest = n - i - 1;
*countPtr = count;
return TRUE;
}
}
*countPtr = count;
return TRUE;
}
/* The channels of scan line number "y" are read. */
static Boln tgaReadScan (Tcl_Interp *interp, tkimg_MFile *handle,
TGAFILE *tf, Int y)
{
Int nchan;
Int count, stop;
UByte localBuf[4];
UByte *pixBufPtr;
count = 0;
stop = tf->th.xsize;
nchan = NCHAN(tf->th.pixsize);
pixBufPtr = tf->pixbuf;
#ifdef DEBUG_LOCAL
tf->total = 0;
#endif
if (IS_COMPRESSED (tf->th.imgtyp)) {
Byte cbuf[1];
Int pix, numpix;
/* While there are pixels left from the previous scanline,
either fill the current scanline with the pixel value
still stored in "pixbuf" (TGA_MODE_SAME) or read in the
appropriate number of pixel values (TGA_MODE_DIFF). */
while (tf->scanrest) {
if (tf->scanmode == TGA_MODE_DIFF) {
if (nchan != tkimg_Read(handle, (char *)localBuf, nchan))
return readError (interp);
}
#ifdef DEBUG_LOCAL
tf->total++;
#endif
*pixBufPtr++ = localBuf[2];
*pixBufPtr++ = localBuf[1];
*pixBufPtr++ = localBuf[0];
if (nchan == 4)
*pixBufPtr++ = localBuf[3];
count++;
tf->scanrest--;
/* If the image is small, the compression might go over several
scanlines. */
if (count == stop)
return TRUE;
}
/* Read the byte telling us the compression mode and the compression
count. Then read the pixel values till a scanline is filled. */
do {
if (1 != tkimg_Read(handle, cbuf, 1))
return readError (interp);
numpix = (cbuf[0] & 0x7F) + 1;
if ((cbuf[0] & 0x80) != 0x80) {
tf->scanmode = TGA_MODE_DIFF;
for (pix=0; pix<numpix; pix++) {
if (!readRlePixel (interp, handle, &pixBufPtr,
&count, stop, 1, tf))
return FALSE;
if (count == stop) {
tf->scanrest = numpix - pix - 1;
break;
}
}
} else {
tf->scanmode = TGA_MODE_SAME;
if (!readRlePixel (interp, handle, &pixBufPtr,
&count, stop, numpix, tf))
return FALSE;
}
} while (count < stop);
#ifdef DEBUG_LOCAL
printf("\tScanline %d: Pixels: %d Rest: %d\n",
y, tf->total, tf->scanrest);
#endif
} else {
/* Read uncompressed pixel data. */
Int i, bytesPerLine;
UByte curPix;
bytesPerLine = nchan * tf->th.xsize;
if (bytesPerLine != tkimg_Read(handle, (char *)tf->pixbuf, bytesPerLine))
return readError (interp);
for (i=0; i<stop; i++) {
curPix = pixBufPtr[2];
pixBufPtr[2] = pixBufPtr[0];
pixBufPtr[0] = curPix;
pixBufPtr += nchan;
}
}
return TRUE;
}
static Boln writePixel(tkimg_MFile *handle, UByte b, UByte g,
UByte r, UByte m, Int nchan)
{
UByte buf[4];
buf[0] = b;
buf[1] = g;
buf[2] = r;
buf[3] = m;
if (nchan != tkimg_Write(handle, (const char *)buf, nchan))
return FALSE;
return TRUE;
}
static Boln tgaWriteScan(Tcl_Interp *interp, tkimg_MFile *handle,
TGAFILE *tf, Int y)
{
UByte *stop, *red_end, *green_end, *blue_end, *matte_end;
Int nchan;
tf->red = tf->redScan;
tf->green = tf->greenScan;
tf->blue = tf->blueScan;
tf->matte = tf->matteScan;
stop = tf->red + tf->th.xsize;
nchan = NCHAN(tf->th.pixsize);
/* Write the scanline data to the file. */
if (! IS_COMPRESSED(tf->th.imgtyp)) {
while (tf->red < stop)
{
if (!writePixel(handle, *tf->blue, *tf->green, *tf->red, *tf->matte, nchan))
return FALSE;
tf->blue++;
tf->green++;
tf->red++;
tf->matte++;
}
}
else /* Run-length Compression */
{
red_end = tf->red + 1;
green_end = tf->green + 1;
blue_end = tf->blue + 1;
matte_end = tf->matte + 1;
while (tf->red < stop)
{
while (red_end < stop &&
*tf->red == *red_end &&
*tf->green == *green_end &&
*tf->blue == *blue_end &&
red_end - tf->red - 1 < MAXRUN)
{
if (nchan == 4)
{
if (*tf->matte != *matte_end)
break;
}
red_end++;
green_end++;
blue_end++;
matte_end++;
}
if (red_end - tf->red >= MINRUN)
{ /* Found a run of compressable data */
if (!writeByte(handle, (Byte)(((red_end - tf->red)-1)|0x80)) ||
!writePixel(handle, *tf->blue, *tf->green, *tf->red, *tf->matte, nchan))
return FALSE;
tf->red = red_end;
tf->green = green_end;
tf->blue = blue_end;
tf->matte = matte_end;
}
else
{ /* Found a run of uncompressable data */
while (red_end < stop &&
((red_end + 1 >= stop ||
*red_end != *(red_end + 1)) ||
(red_end + 2 >= stop ||
*(red_end + 1) != *(red_end + 2))) &&
((green_end + 1 >= stop ||
*green_end != *(green_end + 1)) ||
(green_end + 2 >= stop ||
*(green_end + 1) != *(green_end + 2))) &&
((blue_end + 1 >= stop ||
*blue_end != *(blue_end + 1)) ||
(blue_end + 2 >= stop ||
*(blue_end + 1) != *(blue_end + 2))) &&
red_end - tf->red < MAXRUN)
{
if (nchan == 4)
{
if (! ((matte_end + 1 >= stop ||
*matte_end != *(matte_end + 1)) ||
(matte_end + 2 >= stop ||
*(matte_end + 1) != *(matte_end + 2))))
break;
}
red_end++;
green_end++;
blue_end++;
matte_end++;
}
if (!writeByte(handle, (Byte)((red_end - tf->red) - 1)))
return FALSE;
while (tf->red < red_end)
{
if (!writePixel(handle, *tf->blue, *tf->green, *tf->red, *tf->matte, nchan))
return FALSE;
tf->red++;
tf->green++;
tf->blue++;
tf->matte++;
}
}
red_end++;
green_end++;
blue_end++;
matte_end++;
}
}
return TRUE;
}
/*
* Here is the start of the standard functions needed for every image format.
*/
/*
* Prototypes for local procedures defined in this file:
*/
static int ParseFormatOpts(Tcl_Interp *interp, Tcl_Obj *format,
int *comp, int *verb, int *matte);
static int CommonMatch(tkimg_MFile *handle, int *widthPtr,
int *heightPtr, TGAHEADER *tgaHeaderPtr);
static int CommonRead(Tcl_Interp *interp, tkimg_MFile *handle,
const char *filename, Tcl_Obj *format,
Tk_PhotoHandle imageHandle, int destX, int destY,
int width, int height, int srcX, int srcY);
static int CommonWrite(Tcl_Interp *interp,
const char *filename, Tcl_Obj *format,
tkimg_MFile *handle, Tk_PhotoImageBlock *blockPtr);
static int ParseFormatOpts(interp, format, comp, verb, matte)
Tcl_Interp *interp;
Tcl_Obj *format;
int *comp;
int *verb;
int *matte;
{
static const char *const tgaOptions[] = {"-compression", "-verbose", "-matte", NULL};
int objc, length, c, i, index;
Tcl_Obj **objv;
const char *compression, *verbose, *transp;
*comp = TGA_RGB_COMP;
*verb = 0;
*matte = 1;
if (tkimg_ListObjGetElements(interp, format, &objc, &objv) != TCL_OK)
return TCL_ERROR;
if (objc) {
compression = "rle";
verbose = "0";
transp = "1";
for (i=1; i<objc; i++) {
if (Tcl_GetIndexFromObj(interp, objv[i], (CONST84 char *CONST86 *)tgaOptions,
"format option", 0, &index) != TCL_OK) {
return TCL_ERROR;
}
if (++i >= objc) {
Tcl_AppendResult(interp, "No value for option \"",
Tcl_GetStringFromObj (objv[--i], (int *) NULL),
"\"", (char *) NULL);
return TCL_ERROR;
}
switch(index) {
case 0:
compression = Tcl_GetStringFromObj(objv[i], (int *) NULL);
break;
case 1:
verbose = Tcl_GetStringFromObj(objv[i], (int *) NULL);
break;
case 2:
transp = Tcl_GetStringFromObj(objv[i], (int *) NULL);
break;
}
}
c = compression[0]; length = strlen (compression);
if ((c == 'n') && (!strncmp (compression, "none", length))) {
*comp = TGA_RGB_UNCOMP;
} else if ((c == 'r') && (!strncmp (compression, "rle",length))) {
*comp = TGA_RGB_COMP;
} else {
Tcl_AppendResult(interp, "invalid compression mode \"",
compression, "\": should be rle or none", (char *) NULL);
return TCL_ERROR;
}
c = verbose[0]; length = strlen (verbose);
if (!strncmp (verbose, "1", length) || \
!strncmp (verbose, "true", length) || \
!strncmp (verbose, "on", length)) {
*verb = 1;
} else if (!strncmp (verbose, "0", length) || \
!strncmp (verbose, "false", length) || \
!strncmp (verbose, "off", length)) {
*verb = 0;
} else {
Tcl_AppendResult(interp, "invalid verbose mode \"", verbose,
"\": should be 1 or 0, on or off, true or false",
(char *) NULL);
return TCL_ERROR;
}
c = transp[0]; length = strlen (transp);
if (!strncmp (transp, "1", length) || \
!strncmp (transp, "true", length) || \
!strncmp (transp, "on", length)) {
*matte = 1;
} else if (!strncmp (transp, "0", length) || \
!strncmp (transp, "false", length) || \
!strncmp (transp, "off", length)) {
*matte = 0;
} else {
Tcl_AppendResult(interp, "invalid alpha (matte) mode \"", verbose,
"\": should be 1 or 0, on or off, true or false",
(char *) NULL);
return TCL_ERROR;
}
}
return TCL_OK;
}
static int ChnMatch(
Tcl_Channel chan,
const char *filename,
Tcl_Obj *format,
int *widthPtr,
int *heightPtr,
Tcl_Interp *interp
) {
tkimg_MFile handle;
handle.data = (char *) chan;
handle.state = IMG_CHAN;
return CommonMatch(&handle, widthPtr, heightPtr, NULL);
}
static int ObjMatch(
Tcl_Obj *data,
Tcl_Obj *format,
int *widthPtr,
int *heightPtr,
Tcl_Interp *interp
) {
tkimg_MFile handle;
if (!tkimg_ReadInit (data, 0, &handle)) {
tkimg_ReadInit (data, '*', &handle);
}
return CommonMatch(&handle, widthPtr, heightPtr, NULL);
}
static int CommonMatch(handle, widthPtr, heightPtr, tgaHeaderPtr)
tkimg_MFile *handle;
int *widthPtr;
int *heightPtr;
TGAHEADER *tgaHeaderPtr;
{
TGAHEADER th;
if (!readHeader (handle, &th))
return 0;
*widthPtr = th.xsize;
*heightPtr = th.ysize;
if (tgaHeaderPtr)
*tgaHeaderPtr = th;
return 1;
}
static int ChnRead(interp, chan, filename, format, imageHandle,
destX, destY, width, height, srcX, srcY)
Tcl_Interp *interp; /* Interpreter to use for reporting errors. */
Tcl_Channel chan; /* The image channel, open for reading. */
const char *filename; /* The name of the image file. */
Tcl_Obj *format; /* User-specified format object, or NULL. */
Tk_PhotoHandle imageHandle; /* The photo image to write into. */
int destX, destY; /* Coordinates of top-left pixel in
* photo image to be written to. */
int width, height; /* Dimensions of block of photo image to
* be written to. */
int srcX, srcY; /* Coordinates of top-left pixel to be used
* in image being read. */
{
tkimg_MFile handle;
handle.data = (char *) chan;
handle.state = IMG_CHAN;
return CommonRead(interp, &handle, filename, format, imageHandle,
destX, destY, width, height, srcX, srcY);
}
static int ObjRead(interp, data, format, imageHandle,
destX, destY, width, height, srcX, srcY)
Tcl_Interp *interp;
Tcl_Obj *data;
Tcl_Obj *format;
Tk_PhotoHandle imageHandle;
int destX, destY;
int width, height;
int srcX, srcY;
{
tkimg_MFile handle;
if (!tkimg_ReadInit(data, 0, &handle)) {
tkimg_ReadInit(data, '*', &handle);
}
return CommonRead(interp, &handle, "InlineData", format, imageHandle,
destX, destY, width, height, srcX, srcY);
}
static int CommonRead(interp, handle, filename, format, imageHandle,
destX, destY, width, height, srcX, srcY)
Tcl_Interp *interp; /* Interpreter to use for reporting errors. */
tkimg_MFile *handle; /* The image file, open for reading. */
const char *filename; /* The name of the image file. */
Tcl_Obj *format; /* User-specified format object, or NULL. */
Tk_PhotoHandle imageHandle; /* The photo image to write into. */
int destX, destY; /* Coordinates of top-left pixel in
* photo image to be written to. */
int width, height; /* Dimensions of block of photo image to
* be written to. */
int srcX, srcY; /* Coordinates of top-left pixel to be used
* in image being read. */
{
Tk_PhotoImageBlock block;
Int y, nchan;
int fileWidth, fileHeight;
int stopY, outY, outWidth, outHeight;
TGAFILE tf;
int compr, verbose, matte;
char errMsg[200];
int result = TCL_OK;
memset (&tf, 0, sizeof (TGAFILE));
if (ParseFormatOpts (interp, format, &compr, &verbose, &matte) != TCL_OK) {
return TCL_ERROR;
}
if (!CommonMatch(handle, &fileWidth, &fileHeight, &tf.th))
return TCL_ERROR;
if (verbose)
printImgInfo (&tf.th, filename, "Reading image:");
if ((srcX + width) > fileWidth) {
outWidth = fileWidth - srcX;
} else {
outWidth = width;
}
if ((srcY + height) > fileHeight) {
outHeight = fileHeight - srcY;
} else {
outHeight = height;
}
if ((outWidth <= 0) || (outHeight <= 0)
|| (srcX >= fileWidth) || (srcY >= fileHeight)) {
return TCL_OK;
}
if (tkimg_PhotoExpand(interp, imageHandle, destX + outWidth, destY + outHeight) == TCL_ERROR) {
return TCL_ERROR;
}
if (IS_COMPRESSED(tf.th.imgtyp)) {
tkimg_ReadBuffer(1);
}
tf.scanmode = TGA_MODE_DIFF;
nchan = NCHAN(tf.th.pixsize);
tf.pixbuf = (UByte *) ckalloc (fileWidth * nchan);
if (!tf.pixbuf) {
sprintf(errMsg, "Can't allocate memory of size %d", fileWidth * nchan);
Tcl_AppendResult(interp, errMsg, (char *)NULL);
tkimg_ReadBuffer (0);
return TCL_ERROR;
}
block.pixelSize = nchan;
block.pitch = fileWidth * nchan;
block.width = outWidth;
block.height = 1;
block.offset[0] = 0;
block.offset[1] = 1;
block.offset[2] = 2;
if (nchan < 4) {
matte = 0;
}
block.offset[3] = matte? 3: 0;
block.pixelPtr = tf.pixbuf + srcX * nchan;
stopY = srcY + outHeight;
if (ENC_TOP_BOTTOM (tf.th.imgdes)) {
outY = destY;
for (y=0; y<stopY; y++) {
tgaReadScan(interp, handle, &tf, y);
if (y >= srcY) {
if (tkimg_PhotoPutBlock(interp, imageHandle, &block, destX, outY, width, 1, matte? TK_PHOTO_COMPOSITE_OVERLAY: TK_PHOTO_COMPOSITE_SET) == TCL_ERROR) {
result = TCL_ERROR;
break;
}
outY++;
}
}
} else {
outY = destY + outHeight - 1;
for (y=fileHeight-1; y>=0; y--) {
tgaReadScan(interp, handle, &tf, y);
if (y >= srcY && y < stopY) {
if (tkimg_PhotoPutBlock(interp, imageHandle, &block, destX, outY, width, 1, TK_PHOTO_COMPOSITE_SET) == TCL_ERROR) {
result = TCL_ERROR;
break;
}
outY--;
}
}
}
tgaClose(&tf);
tkimg_ReadBuffer(0);
return result;
}
static int ChnWrite(interp, filename, format, blockPtr)
Tcl_Interp *interp;
const char *filename;
Tcl_Obj *format;
Tk_PhotoImageBlock *blockPtr;
{
Tcl_Channel chan;
tkimg_MFile handle;
int result;
chan = tkimg_OpenFileChannel(interp, filename, 0644);
if (!chan) {
return TCL_ERROR;
}
handle.data = (char *) chan;
handle.state = IMG_CHAN;
result = CommonWrite(interp, filename, format, &handle, blockPtr);
if (Tcl_Close(interp, chan) == TCL_ERROR) {
return TCL_ERROR;
}
return result;
}
static int StringWrite(
Tcl_Interp *interp,
Tcl_Obj *format,
Tk_PhotoImageBlock *blockPtr
) {
tkimg_MFile handle;
int result;
Tcl_DString data;
Tcl_DStringInit(&data);
tkimg_WriteInit(&data, &handle);
result = CommonWrite(interp, "InlineData", format, &handle, blockPtr);
tkimg_Putc(IMG_DONE, &handle);
if (result == TCL_OK) {
Tcl_DStringResult(interp, &data);
} else {
Tcl_DStringFree(&data);
}
return result;
}
static int CommonWrite (interp, filename, format, handle, blockPtr)
Tcl_Interp *interp;
const char *filename;
Tcl_Obj *format;
tkimg_MFile *handle;
Tk_PhotoImageBlock *blockPtr;
{
Int x, y, nchan;
Int redOffset, greenOffset, blueOffset, alphaOffset;
UByte *pixelPtr, *rowPixPtr;
TGAFILE tf;
int compr, verbose, matte; /* Format options */
char errMsg[200];
memset(&tf, 0, sizeof(TGAFILE));
if (ParseFormatOpts(interp, format, &compr, &verbose, &matte) != TCL_OK) {
return TCL_ERROR;
}
redOffset = 0;
greenOffset = blockPtr->offset[1] - blockPtr->offset[0];
blueOffset = blockPtr->offset[2] - blockPtr->offset[0];
alphaOffset = blockPtr->offset[0];
if (alphaOffset < blockPtr->offset[2]) {
alphaOffset = blockPtr->offset[2];
}
if (++alphaOffset < blockPtr->pixelSize) {
alphaOffset -= blockPtr->offset[0];
} else {
alphaOffset = 0;
}
nchan = ((matte && alphaOffset)? 4: 3);
tf.redScan = (UByte *) ckalloc(blockPtr->width);
tf.greenScan = (UByte *) ckalloc(blockPtr->width);
tf.blueScan = (UByte *) ckalloc(blockPtr->width);
tf.matteScan = (UByte *) ckalloc(blockPtr->width);
if (!tf.redScan || !tf.greenScan || !tf.blueScan || !tf.matteScan) {
sprintf(errMsg, "Can't allocate memory of size %d", blockPtr->width);
Tcl_AppendResult(interp, errMsg, (char *)NULL);
return TCL_ERROR;
}
/* Fill the targa header struct and write the header to the channel. */
tf.th.pixsize = nchan * 8;
tf.th.xsize = blockPtr->width;
tf.th.ysize = blockPtr->height;
tf.th.imgdes = (1 << 5); /* Top->Bottom, Left->Right encoding */
tf.th.imgtyp = compr; /* Uncompressed or RLE-compressed */
if (!writeHeader(handle, &tf.th)) {
return TCL_ERROR;
}
rowPixPtr = blockPtr->pixelPtr + blockPtr->offset[0];
for (y = 0; y < blockPtr->height; y++) {
tf.red = tf.redScan;
tf.green = tf.greenScan;
tf.blue = tf.blueScan;
tf.matte = tf.matteScan;
pixelPtr = rowPixPtr;
for (x = 0; x < blockPtr->width; x++) {
*(tf.red++) = pixelPtr[redOffset];
*(tf.green++) = pixelPtr[greenOffset];
*(tf.blue++) = pixelPtr[blueOffset];
if (nchan == 4) {
/* Have a matte channel and write it. */
*(tf.matte++) = pixelPtr[alphaOffset];
}
pixelPtr += blockPtr->pixelSize;
}
if (!tgaWriteScan(interp, handle, &tf, y)) {
tgaClose (&tf);
return TCL_ERROR;
}
rowPixPtr += blockPtr->pitch;
}
if (verbose)
printImgInfo(&tf.th, filename, "Saving image:");
tgaClose (&tf);
return TCL_OK;
}
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