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xvpng.c
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/*
* xvpng.c - load and write routines for 'PNG' format pictures
*
* callable functions
*
* CreatePNGW()
* PNGDialog(vis)
* PNGCheckEvent(xev)
* PNGSaveParams(fname, col)
* LoadPNG(fname, pinfo)
* VersionInfoPNG()
*/
/*#include "copyright.h"*/
/* (c) 1995 by Alexander Lehmann <lehmann@mathematik.th-darmstadt.de>
* This file is a suplement to xv and is supplied under the same copying
* conditions (except the shareware part).
* The copyright will be passed on to JB at some future point if he
* so desires.
*
* Modified by Andreas Dilger <adilger@enel.ucalgary.ca> to fix
* error handling for bad PNGs, add dialogs for interlacing and
* compression selection, and upgrade to libpng-0.89.
*
* Modified by Greg Roelofs, TenThumbs and others to fix bugs and add
* features. See README.jumbo for details.
*/
#include "xv.h"
#ifdef HAVE_PNG
#include <zlib.h>
#include <png.h>
/*** Stuff for PNG Dialog box ***/
#define PWIDE 318
#define PHIGH 215
#define DISPLAY_GAMMA 2.20 /* default display gamma */
#define COMPRESSION 6 /* default zlib compression level, not max
(Z_BEST_COMPRESSION) */
#define HAVE_tRNS (info_ptr->valid & PNG_INFO_tRNS)
#define DWIDE 86
#define DHIGH 104
#define PFX (PWIDE-93)
#define PFY 44
#define PFH 20
#define P_BOK 0
#define P_BCANC 1
#define P_NBUTTS 2
#define BUTTH 24
#define LF 10 /* a.k.a. '\n' on ASCII machines */
#define CR 13 /* a.k.a. '\r' on ASCII machines */
/*** local functions ***/
static void drawPD PARM((int, int, int, int));
static void clickPD PARM((int, int));
static void doCmd PARM((int));
static void writePNG PARM((void));
static int WritePNG PARM((FILE *, byte *, int, int, int,
byte *, byte *, byte *, int));
static void png_xv_error PARM((png_structp png_ptr,
png_const_charp message));
static void png_xv_warning PARM((png_structp png_ptr,
png_const_charp message));
/*** local variables ***/
static char *filename;
static const char *fbasename;
static int colorType;
static int read_anything;
static double Display_Gamma = DISPLAY_GAMMA;
static DIAL cDial, gDial;
static BUTT pbut[P_NBUTTS];
static CBUTT interCB;
static CBUTT FdefCB, FnoneCB, FsubCB, FupCB, FavgCB, FPaethCB;
#ifdef PNG_NO_STDIO
/* NOTE: Some sites configure their version of the PNG Library without
* Standard I/O Library interfaces in order to avoid unnecessary inter-
* library dependencies at link time for applications that don't need Standard
* I/O. If your site is one of these, the following skeletal stubs, copied
* from libpng code, should be enough for this module. --Scott B. Marovich,
* Hewlett-Packard Laboratories, March 2001.
*/
static void
png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
{
/* fread() returns 0 on error, so it is OK to store this in a png_size_t
* instead of an int, which is what fread() actually returns.
*/
if (fread(data,1,length,(FILE *)png_ptr->io_ptr) != length)
png_error(png_ptr, "Read Error");
}
static void
png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
{
if (fwrite(data, 1, length, (FILE *)png_ptr->io_ptr) != length)
png_error(png_ptr, "Write Error");
}
#endif /* PNG_NO_STDIO */
/**************************************************************************/
/* PNG SAVE DIALOG ROUTINES ***********************************************/
/**************************************************************************/
/*******************************************/
void CreatePNGW()
{
pngW = CreateWindow("xv png", "XVPNG", NULL,
PWIDE, PHIGH, infofg, infobg, FALSE);
if (!pngW) FatalError("can't create PNG window!");
XSelectInput(theDisp, pngW, ExposureMask | ButtonPressMask | KeyPressMask);
DCreate(&cDial, pngW, 12, 25, DWIDE, DHIGH, (double)Z_NO_COMPRESSION,
(double)Z_BEST_COMPRESSION, COMPRESSION, 1.0, 3.0,
infofg, infobg, hicol, locol, "Compression", NULL);
DCreate(&gDial, pngW, DWIDE+27, 25, DWIDE, DHIGH, 1.0, 3.5,DISPLAY_GAMMA,0.01,0.2,
infofg, infobg, hicol, locol, "Disp. Gamma", NULL);
CBCreate(&interCB, pngW, DWIDE+30, DHIGH+3*LINEHIGH+2, "interlace",
infofg, infobg, hicol, locol);
CBCreate(&FdefCB, pngW, PFX, PFY, "Default",
infofg, infobg, hicol, locol);
FdefCB.val = 1;
CBCreate(&FnoneCB, pngW, PFX, FdefCB.y + PFH + 4, "none",
infofg, infobg, hicol, locol);
CBCreate(&FsubCB, pngW, PFX, FnoneCB.y + PFH, "sub",
infofg, infobg, hicol, locol);
CBCreate(&FupCB, pngW, PFX, FsubCB.y + PFH, "up",
infofg, infobg, hicol, locol);
CBCreate(&FavgCB, pngW, PFX, FupCB.y + PFH, "average",
infofg, infobg, hicol, locol);
CBCreate(&FPaethCB, pngW, PFX, FavgCB.y + PFH, "Paeth",
infofg, infobg, hicol, locol);
FnoneCB.val = FsubCB.val = FupCB.val = FavgCB.val = FPaethCB.val = 1;
CBSetActive(&FnoneCB, !FdefCB.val);
CBSetActive(&FsubCB, !FdefCB.val);
CBSetActive(&FupCB, !FdefCB.val);
CBSetActive(&FavgCB, !FdefCB.val);
CBSetActive(&FPaethCB, !FdefCB.val);
BTCreate(&pbut[P_BOK], pngW, PWIDE-180-1, PHIGH-10-BUTTH-1, 80, BUTTH,
"Ok", infofg, infobg, hicol, locol);
BTCreate(&pbut[P_BCANC], pngW, PWIDE-90-1, PHIGH-10-BUTTH-1, 80, BUTTH,
"Cancel", infofg, infobg, hicol, locol);
XMapSubwindows(theDisp, pngW);
}
/*******************************************/
void PNGDialog(vis)
int vis;
{
if (vis) {
CenterMapWindow(pngW, pbut[P_BOK].x + (int) pbut[P_BOK].w/2,
pbut[P_BOK].y + (int) pbut[P_BOK].h/2,
PWIDE, PHIGH);
}
else XUnmapWindow(theDisp, pngW);
pngUp = vis;
}
/*******************************************/
int PNGCheckEvent(xev)
XEvent *xev;
{
/* check event to see if it's for one of our subwindows. If it is,
deal accordingly, and return '1'. Otherwise, return '0' */
int rv;
rv = 1;
if (!pngUp) return 0;
if (xev->type == Expose) {
int x,y,w,h;
XExposeEvent *e = (XExposeEvent *) xev;
x = e->x; y = e->y; w = e->width; h = e->height;
/* throw away excess expose events for 'dumb' windows */
if (e->count > 0 && (e->window == cDial.win)) {}
else if (e->window == pngW) drawPD(x, y, w, h);
else if (e->window == cDial.win) DRedraw(&cDial);
else if (e->window == gDial.win) DRedraw(&gDial);
else rv = 0;
}
else if (xev->type == ButtonPress) {
XButtonEvent *e = (XButtonEvent *) xev;
int x,y;
x = e->x; y = e->y;
if (e->button == Button1) {
if (e->window == pngW) clickPD(x,y);
else if (e->window == cDial.win) DTrack(&cDial,x,y);
else if (e->window == gDial.win) DTrack(&gDial,x,y);
else rv = 0;
} /* button1 */
else rv = 0;
} /* button press */
else if (xev->type == KeyPress) {
XKeyEvent *e = (XKeyEvent *) xev;
char buf[128]; KeySym ks;
int stlen;
stlen = XLookupString(e,buf,128,&ks,(XComposeStatus *) NULL);
buf[stlen] = '\0';
RemapKeyCheck(ks, buf, &stlen);
if (e->window == pngW) {
if (stlen) {
if (buf[0] == '\r' || buf[0] == '\n') { /* enter */
FakeButtonPress(&pbut[P_BOK]);
}
else if (buf[0] == '\033') { /* ESC */
FakeButtonPress(&pbut[P_BCANC]);
}
}
}
else rv = 0;
}
else rv = 0;
if (rv==0 && (xev->type == ButtonPress || xev->type == KeyPress)) {
XBell(theDisp, 50);
rv = 1; /* eat it */
}
return rv;
}
/*******************************************/
void PNGSaveParams(fname, col)
char *fname;
int col;
{
filename = fname;
colorType = col;
}
/*******************************************/
static void drawPD(x, y, w, h)
int x, y, w, h;
{
const char *title = "Save PNG file...";
char ctitle1[20];
const char *ctitle2 = "Useful range";
const char *ctitle3 = "is 2 - 7.";
const char *ctitle4 = "Uncompressed = 0";
const char *ftitle = "Row Filters:";
char gtitle[20];
int i;
XRectangle xr;
xr.x = x; xr.y = y; xr.width = w; xr.height = h;
XSetClipRectangles(theDisp, theGC, 0,0, &xr, 1, Unsorted);
XSetForeground(theDisp, theGC, infofg);
XSetBackground(theDisp, theGC, infobg);
for (i=0; i<P_NBUTTS; i++) BTRedraw(&pbut[i]);
DrawString(pngW, 15, 6+ASCENT, title);
sprintf(ctitle1, "Default = %d", COMPRESSION);
DrawString(pngW, 18, 6+DHIGH+cDial.y+ASCENT, ctitle1);
DrawString(pngW, 17, 6+DHIGH+cDial.y+ASCENT+LINEHIGH, ctitle2);
DrawString(pngW, 17, 6+DHIGH+cDial.y+ASCENT+2*LINEHIGH, ctitle3);
DrawString(pngW, 17, 6+DHIGH+cDial.y+ASCENT+3*LINEHIGH, ctitle4);
sprintf(gtitle, "Default = %g", DISPLAY_GAMMA);
DrawString(pngW, DWIDE+30, 6+DHIGH+gDial.y+ASCENT, gtitle);
ULineString(pngW, FdefCB.x, FdefCB.y-3-DESCENT, ftitle);
XDrawRectangle(theDisp, pngW, theGC, FdefCB.x-11, FdefCB.y-LINEHIGH-3,
93, 8*LINEHIGH+15);
CBRedraw(&FdefCB);
XDrawLine(theDisp, pngW, theGC, FdefCB.x-11, FdefCB.y+LINEHIGH+4,
FdefCB.x+82, FdefCB.y+LINEHIGH+4);
CBRedraw(&FnoneCB);
CBRedraw(&FupCB);
CBRedraw(&FsubCB);
CBRedraw(&FavgCB);
CBRedraw(&FPaethCB);
CBRedraw(&interCB);
XSetClipMask(theDisp, theGC, None);
}
/*******************************************/
static void clickPD(x,y)
int x,y;
{
int i;
BUTT *bp;
/* check BUTTs */
for (i=0; i<P_NBUTTS; i++) {
bp = &pbut[i];
if (PTINRECT(x, y, bp->x, bp->y, bp->w, bp->h)) break;
}
if (i<P_NBUTTS) { /* found one */
if (BTTrack(bp)) doCmd(i);
}
/* check CBUTTs */
else if (CBClick(&FdefCB,x,y)) {
int oldval = FdefCB.val;
CBTrack(&FdefCB);
if (oldval != FdefCB.val)
{
CBSetActive(&FnoneCB, !FdefCB.val);
CBSetActive(&FsubCB, !FdefCB.val);
CBSetActive(&FupCB, !FdefCB.val);
CBSetActive(&FavgCB, !FdefCB.val);
CBSetActive(&FPaethCB, !FdefCB.val);
CBRedraw(&FnoneCB);
CBRedraw(&FupCB);
CBRedraw(&FsubCB);
CBRedraw(&FavgCB);
CBRedraw(&FPaethCB);
}
}
else if (CBClick(&FnoneCB,x,y)) CBTrack(&FnoneCB);
else if (CBClick(&FsubCB,x,y)) CBTrack(&FsubCB);
else if (CBClick(&FupCB,x,y)) CBTrack(&FupCB);
else if (CBClick(&FavgCB,x,y)) CBTrack(&FavgCB);
else if (CBClick(&FPaethCB,x,y)) CBTrack(&FPaethCB);
else if (CBClick(&interCB,x,y)) CBTrack(&interCB);
}
/*******************************************/
static void doCmd(cmd)
int cmd;
{
switch (cmd) {
case P_BOK:
{
char *fullname;
writePNG();
PNGDialog(0);
fullname = GetDirFullName();
if (!ISPIPE(fullname[0])) {
XVCreatedFile(fullname);
StickInCtrlList(0);
}
}
break;
case P_BCANC:
PNGDialog(0);
break;
default:
break;
}
}
/*******************************************/
static void writePNG()
{
FILE *fp;
int w, h, nc, rv, ptype, pfree;
byte *inpix, *rmap, *gmap, *bmap;
fp = OpenOutFile(filename);
if (!fp) return;
fbasename = BaseName(filename);
WaitCursor();
inpix = GenSavePic(&ptype, &w, &h, &pfree, &nc, &rmap, &gmap, &bmap);
rv = WritePNG(fp, inpix, ptype, w, h, rmap, gmap, bmap, nc);
SetCursors(-1);
if (CloseOutFile(fp, filename, rv) == 0) DirBox(0);
if (pfree) free(inpix);
}
/*******************************************/
int WritePNG(fp, pic, ptype, w, h, rmap, gmap, bmap, numcols)
FILE *fp;
byte *pic;
int ptype, w, h;
byte *rmap, *gmap, *bmap;
int numcols;
/* FIXME? what's diff between picComments and WriteGIF's comment arg? */
{
png_struct *png_ptr;
png_info *info_ptr;
png_color palette[256];
png_textp text;
byte r1[256], g1[256], b1[256]; /* storage for deduped palette */
byte pc2nc[256]; /* for duplicated-color remapping (1st level) */
byte remap[256]; /* for bw/grayscale remapping (2nd level) */
int i, j, numuniqcols=0, filter, linesize, pass;
byte *p, *png_line;
char software[256];
char *savecmnt;
/* Stuff for v1.5 compliance */
png_byte bit_depth;
png_byte color_type;
int num_palette;
int num_text;
int max_text;
png_time mod_time;
png_byte interlace_type;
if ((png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL,
png_xv_error, png_xv_warning)) == NULL) {
sprintf(software, "png_create_write_struct() failure in WritePNG");
FatalError(software);
}
if ((info_ptr = png_create_info_struct(png_ptr)) == NULL)
{
png_destroy_write_struct(&png_ptr, &info_ptr);
sprintf(software, "png_create_info_struct() failure in WritePNG");
FatalError(software);
}
if (setjmp(png_jmpbuf(png_ptr))) {
png_destroy_write_struct(&png_ptr, &info_ptr);
return -1;
}
#ifdef PNG_NO_STDIO
png_set_write_fn(png_ptr, fp, png_default_write_data, NULL);
png_set_error_fn(png_ptr, NULL, png_xv_error, png_xv_warning);
#else
png_init_io(png_ptr, fp);
#endif
png_set_compression_level(png_ptr, (int)cDial.val);
/* Don't bother filtering if we aren't compressing the image */
if (FdefCB.val)
{
if ((int)cDial.val == 0)
png_set_filter(png_ptr, 0, PNG_FILTER_NONE);
filter = PNG_FILTER_NONE;
}
else
{
filter = FnoneCB.val ? PNG_FILTER_NONE : 0;
filter |= FsubCB.val ? PNG_FILTER_SUB : 0;
filter |= FupCB.val ? PNG_FILTER_UP : 0;
filter |= FavgCB.val ? PNG_FILTER_AVG : 0;
filter |= FPaethCB.val ? PNG_FILTER_PAETH : 0;
png_set_filter(png_ptr, 0, filter);
}
if (w <= 0 || h <= 0) {
SetISTR(ISTR_WARNING, "%s: image dimensions out of range (%dx%d)",
fbasename, w, h);
png_destroy_write_struct(&png_ptr, &info_ptr);
return -1;
}
interlace_type = interCB.val ? 1 : 0;
linesize = 0; /* quiet a compiler warning */
/* GRR 20070331: remap palette to eliminate duplicated colors (as in
* xvgifwr.c) */
if (ptype == PIC8) {
for (i=0; i<256; ++i) {
pc2nc[i] = r1[i] = g1[i] = b1[i] = 0;
}
/* compute number of unique colors */
numuniqcols = 0;
for (i=0; i<numcols; ++i) {
/* see if color #i is already used */
for (j=0; j<i; ++j) {
if (rmap[i] == rmap[j] && gmap[i] == gmap[j] && bmap[i] == bmap[j])
break;
}
if (j==i) { /* wasn't found */
pc2nc[i] = numuniqcols;
r1[numuniqcols] = rmap[i]; /* i.e., r1[pc2nc[i]] == rmap[i] */
g1[numuniqcols] = gmap[i];
b1[numuniqcols] = bmap[i];
++numuniqcols;
}
else pc2nc[i] = pc2nc[j];
}
}
/* Appendix G.2 of user manual claims colorType will never be F_REDUCED... */
if (colorType == F_FULLCOLOR || colorType == F_REDUCED) {
if (ptype == PIC24) {
linesize = 3*w;
if (linesize/3 < w) {
SetISTR(ISTR_WARNING, "%s: image dimensions too large (%dx%d)",
fbasename, w, h);
png_destroy_write_struct(&png_ptr, &info_ptr);
return -1;
}
color_type = PNG_COLOR_TYPE_RGB;
bit_depth = 8;
} else /* ptype == PIC8 */ {
linesize = w;
color_type = PNG_COLOR_TYPE_PALETTE;
if (numuniqcols <= 2)
bit_depth = 1;
else
if (numuniqcols <= 4)
bit_depth = 2;
else
if (numuniqcols <= 16)
bit_depth = 4;
else
bit_depth = 8;
for (i = 0; i < numuniqcols; i++) {
palette[i].red = r1[i];
palette[i].green = g1[i];
palette[i].blue = b1[i];
}
png_set_PLTE(png_ptr, info_ptr, palette, numuniqcols);
}
}
else if (colorType == F_GREYSCALE || colorType == F_BWDITHER) {
color_type = PNG_COLOR_TYPE_GRAY;
if (colorType == F_BWDITHER) {
/* shouldn't happen */
if (ptype == PIC24) FatalError("PIC24 and B/W Stipple in WritePNG()");
bit_depth = 1;
if (MONO(r1[0], g1[0], b1[0]) > MONO(r1[1], g1[1], b1[1])) {
remap[0] = 1;
remap[1] = 0;
}
else {
remap[0] = 0;
remap[1] = 1;
}
linesize = w;
}
else /* F_GREYSCALE */ {
if (ptype == PIC24) {
linesize = 3*w;
if (linesize/3 < w) {
SetISTR(ISTR_WARNING, "%s: image dimensions too large (%dx%d)",
fbasename, w, h);
png_destroy_write_struct(&png_ptr, &info_ptr);
return -1;
}
bit_depth = 8;
}
else /* ptype == PIC8 */ {
int low_precision;
linesize = w;
/* NOTE: currently remap[] is the _secondary_ remapping of "palette"
* colors; its values are the final color/grayscale values, and,
* like r1/g1/b1[], it is _indexed_ by pc2nc[] (which is why its
* values come from r1/g1/b1[] and not from rmap/gmap/bmap[]).
*
* FIXME (probably): MONO() will create new duplicates; ideally should
* do extra round of dup-detection (and preferably collapse all
* remapping levels into single LUT). This stuff is a tad confusing.
*/
for (i = 0; i < numuniqcols; i++)
remap[i] = MONO(r1[i], g1[i], b1[i]);
for (; i < 256; i++)
remap[i]=0; /* shouldn't be necessary, but... */
bit_depth = 8;
/* Note that this fails most of the time because of gamma */
/* (and that would be a bug: GRR FIXME) */
/* try to adjust to 4-bit precision grayscale */
low_precision=1;
for (i = 0; i < numuniqcols; i++) {
if ((remap[i] & 0x0f) * 0x11 != remap[i]) {
low_precision = 0;
break;
}
}
if (low_precision) {
for (i = 0; i < numuniqcols; i++) {
remap[i] &= 0xf;
}
bit_depth = 4;
/* try to adjust to 2-bit precision grayscale */
for (i = 0; i < numuniqcols; i++) {
if ((remap[i] & 0x03) * 0x05 != remap[i]) {
low_precision = 0;
break;
}
}
}
if (low_precision) {
for (i = 0; i < numuniqcols; i++) {
remap[i] &= 3;
}
bit_depth = 2;
/* try to adjust to 1-bit precision grayscale */
for (i = 0; i < numuniqcols; i++) {
if ((remap[i] & 0x01) * 0x03 != remap[i]) {
low_precision = 0;
break;
}
}
}
if (low_precision) {
for (i = 0; i < numuniqcols; i++) {
remap[i] &= 1;
}
bit_depth = 1;
}
}
}
}
else
png_error(png_ptr, "Unknown colorstyle in WritePNG");
if ((text = (png_textp)malloc(sizeof(png_text)))) {
sprintf(software, "XV %s", REVDATE);
text->compression = -1;
text->key = "Software";
text->text = software;
text->text_length = strlen(text->text);
max_text = 1;
num_text = 1;
}
png_set_IHDR(png_ptr, info_ptr, w, h,
bit_depth,
color_type,
interlace_type,
PNG_COMPRESSION_TYPE_DEFAULT,
PNG_FILTER_TYPE_DEFAULT);
Display_Gamma = gDial.val; /* Save the current gamma for loading */
/*GRR FIXME: add .Xdefaults option to omit writing gamma (size, cumulative errors when editing)--alternatively, modify save box to include "omit" checkbox */
png_set_gAMA(png_ptr, info_ptr, 1.0/gDial.val);
png_write_info(png_ptr, info_ptr);
if (bit_depth < 8)
png_set_packing(png_ptr);
pass=png_set_interlace_handling(png_ptr);
if ((png_line = malloc(linesize)) == NULL)
png_error(png_ptr, "cannot allocate temp image line");
/* FIXME: should be FatalError() */
for (i = 0; i < pass; ++i) {
int j;
p = pic;
for (j = 0; j < h; ++j) {
if (color_type == PNG_COLOR_TYPE_GRAY) {
int k;
for (k = 0; k < w; ++k)
png_line[k] = ptype==PIC24 ? MONO(p[k*3], p[k*3+1], p[k*3+2]) :
remap[pc2nc[p[k]]];
png_write_row(png_ptr, png_line);
} else if (color_type == PNG_COLOR_TYPE_PALETTE) {
int k;
for (k = 0; k < w; ++k)
png_line[k] = pc2nc[p[k]];
png_write_row(png_ptr, png_line);
} else { /* PNG_COLOR_TYPE_RGB */
png_write_row(png_ptr, p);
}
if ((j & 0x1f) == 0) WaitCursor();
p += linesize;
}
}
free(png_line);
savecmnt = NULL; /* quiet a compiler warning */
if (text) {
if (picComments && strlen(picComments) &&
(savecmnt = (char *)malloc((strlen(picComments) + 1)*sizeof(char)))) {
png_textp tp;
char *comment, *key;
strcpy(savecmnt, picComments);
key = savecmnt;
tp = text;
num_text = 0;
comment = strchr(key, ':');
do {
/* Allocate a larger structure for comments if necessary */
if (num_text >= max_text)
{
if ((tp =
realloc(text, (num_text + 2)*sizeof(png_text))) == NULL)
{
break;
}
else
{
text = tp;
tp = &text[num_text];
max_text += 2;
}
}
/* See if it looks like a PNG keyword from LoadPNG */
/* GRR: should test for strictly < 80, right? (key = 1-79 chars only) */
if (comment && comment[1] == ':' && comment - key <= 80) {
*(comment++) = '\0';
*(comment++) = '\0';
/* If the comment is the 'Software' chunk XV writes, we remove it,
since we have already stored one */
if (strcmp(key, "Software") == 0 && strncmp(comment, "XV", 2) == 0) {
key = strchr(comment, '\n');
if (key)
key++; /* skip \n */
comment = strchr(key, ':');
}
/* We have another keyword and/or comment to write out */
else {
tp->key = key;
tp->text = comment;
/* We have to find the end of this comment, and the next keyword
if there is one */
for (; NULL != (key = comment = strchr(comment, ':')); comment++)
if (key[1] == ':')
break;
/* It looks like another keyword, go backward to the beginning */
if (key) {
while (key > tp->text && *key != '\n')
key--;
if (key > tp->text && comment - key <= 80) {
*key = '\0';
key++;
}
}
tp->text_length = strlen(tp->text);
/* We don't have another keyword, so remove the last newline */
if (!key && tp->text[tp->text_length - 1] == '\n')
{
tp->text[tp->text_length] = '\0';
tp->text_length--;
}
tp->compression = tp->text_length > 640 ? 0 : -1;
num_text++;
tp++;
}
}
/* Just a generic comment: make sure line-endings are valid for PNG */
else {
char *p=key, *q=key; /* only deleting chars, not adding any */
while (*p) {
if (*p == CR) { /* lone CR or CR/LF: EOL either way */
*q++ = LF; /* LF is the only allowed PNG line-ending */
if (p[1] == LF) /* get rid of any original LF */
++p;
} else if (*p == LF) /* lone LF */
*q++ = LF;
else
*q++ = *p;
++p;
}
*q = '\0'; /* unnecessary...but what the heck */
tp->key = "Comment";
tp->text = key;
tp->text_length = q - key;
tp->compression = tp->text_length > 750 ? 0 : -1;
num_text++;
key = NULL;
}
} while (key && *key);
}
else {
num_text = 0;
}
}
png_set_text(png_ptr, info_ptr, text, num_text);
png_convert_from_time_t(&mod_time, time(NULL));
png_set_tIME(png_ptr, info_ptr, &mod_time);
png_write_end(png_ptr, info_ptr);
fflush(fp); /* just in case we core-dump before finishing... */
if (text) {
free(text);
/* must do this or png_destroy_write_struct() 0.97+ will free text again: */
if (savecmnt)
{
free(savecmnt);
savecmnt = (char *)NULL;
}
}
png_destroy_write_struct(&png_ptr, &info_ptr);
return 0;
}
/*******************************************/
int LoadPNG(fname, pinfo)
char *fname;
PICINFO *pinfo;
/*******************************************/
{
/* returns '1' on success */
FILE *fp;
png_struct *png_ptr;
png_info *info_ptr;
png_color_16 my_background;
int i,j;
int linesize, bufsize;
int filesize;
int pass;
int gray_to_rgb;
size_t commentsize;
/* Stuff for v1.5 compliance */
double gamma;
png_color_16p background;
png_colorp palette;
int num_palette;
png_textp text;
int num_text;
fbasename = BaseName(fname);
pinfo->pic = (byte *) NULL;
pinfo->comment = (char *) NULL;
read_anything=0;
/* open the file */
fp = xv_fopen(fname,"r");
if (!fp) {
SetISTR(ISTR_WARNING,"%s: can't open file", fname);
return 0;
}
/* find the size of the file */
fseek(fp, 0L, 2);
filesize = ftell(fp);
fseek(fp, 0L, 0);
png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL,
png_xv_error, png_xv_warning);
if (!png_ptr) {
fclose(fp);
FatalError("malloc failure in LoadPNG");
}
info_ptr = png_create_info_struct(png_ptr);
if (!info_ptr) {
fclose(fp);
png_destroy_read_struct(&png_ptr, (png_infopp)NULL, (png_infopp)NULL);
FatalError("malloc failure in LoadPNG");
}
if (setjmp(png_jmpbuf(png_ptr))) {
fclose(fp);
png_destroy_read_struct(&png_ptr, &info_ptr, (png_infopp)NULL);
if (!read_anything) {
if (pinfo->pic) {
free(pinfo->pic);
pinfo->pic = NULL;
}
if (pinfo->comment) {
free(pinfo->comment);
pinfo->comment = NULL;
}
}
return read_anything;
}
#ifdef PNG_NO_STDIO
png_set_read_fn(png_ptr, fp, png_default_read_data);
png_set_error_fn(png_ptr, NULL, png_xv_error, png_xv_warning);
#else
png_init_io(png_ptr, fp);
#endif
png_read_info(png_ptr, info_ptr);
pinfo->w = pinfo->normw = png_get_image_width(png_ptr, info_ptr);
pinfo->h = pinfo->normh = png_get_image_height(png_ptr, info_ptr);
if (pinfo->w <= 0 || pinfo->h <= 0) {
SetISTR(ISTR_WARNING, "%s: image dimensions out of range (%dx%d)",
fbasename, pinfo->w, pinfo->h);
png_destroy_read_struct(&png_ptr, &info_ptr, (png_infopp)NULL);
return read_anything;
}
pinfo->frmType = F_PNG;
sprintf(pinfo->fullInfo, "PNG, %d bit ",
png_get_bit_depth(png_ptr, info_ptr) * png_get_channels(png_ptr, info_ptr));
switch(png_get_color_type(png_ptr, info_ptr)) {
case PNG_COLOR_TYPE_PALETTE:
strcat(pinfo->fullInfo, "palette color");
break;
case PNG_COLOR_TYPE_GRAY:
strcat(pinfo->fullInfo, "grayscale");
break;
case PNG_COLOR_TYPE_GRAY_ALPHA:
strcat(pinfo->fullInfo, "grayscale+alpha");
break;
case PNG_COLOR_TYPE_RGB:
strcat(pinfo->fullInfo, "truecolor");
break;
case PNG_COLOR_TYPE_RGB_ALPHA: