From 40778e1c13bffd9dc29991b0c7c85e6444d4becd Mon Sep 17 00:00:00 2001
From: glenda <glenda@r51>
Date: Sat, 1 Feb 2025 19:20:19 +0000
Subject: [PATCH] make it easier to move resizing internal

---
 pres.c | 164 ++++++++++++++++++++++++++++++++++-----------------------
 1 file changed, 99 insertions(+), 65 deletions(-)

diff --git a/pres.c b/pres.c
index f852a50c85224e8ad64c63bfde0d8bbbfa766dbd..a347f9e1e7160ab7fce6952daf7253af1c05b100 100644
--- a/pres.c
+++ b/pres.c
@@ -225,16 +225,108 @@ checkfile(void)
 		exits("checkfile");
 }
 
+Image *
+openimage(char *name)
+{
+	int i, n, p[2], fd;
+	char buf[64], *conv;
+	Waitmsg *wm;
+	Image *ret;
+
+	pipe(p);
+
+	if(fork() == 0){
+		close(1);
+		dup(p[0], 1);
+		execl("/bin/file", "file", "-m", name, nil);
+	}
+	wm = wait();
+	if(wm->msg != nil && *wm->msg != '\0')
+		sysfatal("%s", wm->msg);
+	free(wm);
+
+	n = read(p[1], buf, sizeof(buf));
+	buf[n - 1] = '\0'; /* replace the newline */
+
+	conv = nil;
+	for(i = 0; mimetab[i] != nil; i+=2){
+		if(strcmp(buf, mimetab[i]) == 0){
+			conv = mimetab[i+1];
+			break;
+		}
+	}
+	if(conv == nil)
+		sysfatal("unknown image format '%s'", buf);
+
+	if(*conv == '\0'){
+		fd = open(name, OREAD);
+		if(fd < 0)
+			sysfatal("%r");
+		ret = readimage(display, fd, 0);
+		close(fd);
+	}else{
+		if(fork() == 0){
+			close(1);
+			dup(p[0], 1);
+			sprint(buf, "/bin/%s", conv);
+			execl(buf, conv, "-9c", name, nil);
+		}
+		ret = readimage(display, p[1], 0);
+	}
+
+	close(p[0]);
+	close(p[1]);
+
+	return ret;
+}
+
+Image *
+resizeimage(Image *img, Point sdims)
+{
+	int p[2], fd;
+	char namebuf[64], dimsbuf[64];
+	Point idims;
+	Image *ret;
+
+	pipe(p);
+
+	idims = subpt(img->r.max, img->r.min);
+ 
+	sprint(namebuf, "/tmp/%s.%d.img", argv0, getpid());
+	fd = create(namebuf, OWRITE, 0600);
+	if(fd < 0)
+		sysfatal("couldn't open tmp file: %r");
+	writeimage(fd, img, 0);
+	close(fd);
+
+	if(fork() == 0){
+		close(1);
+		dup(p[0], 1);
+
+		if(idims.x < idims.y || (idims.x == idims.y && sdims.x > sdims.y)){
+			sprint(dimsbuf, "%d", sdims.x);
+			execl("/bin/resize", "resize", "-x", dimsbuf, namebuf, nil);
+		}else{
+			sprint(dimsbuf, "%d", sdims.y);
+			execl("/bin/resize", "resize", "-y", dimsbuf, namebuf, nil);
+		}
+	}
+
+	ret = readimage(display, p[1], 0);
+	close(p[0]);
+	close(p[1]);
+
+	return ret;
+}
+
 // FIXME: some of this could be done in-process but i am lazy
 // TODO: should check image formats in checkimage() instead
 void
 loadimages(void){
 	const Slide *s;
 	Image **nextimg, *cimg;
-	Waitmsg *wm;
-	Point idims, sdims;
-	int i, j, n, cols, rows, p[2], fd;
-	char buf[64], buf2[64], *conv;
+	Point sdims;
+	int i, j, cols, rows;
 
 	if(images != nil)
 		return;
@@ -244,8 +336,6 @@ loadimages(void){
 	images = calloc(s->nlines, sizeof(Image*));
 	nextimg = images;
 
-	pipe(p);
-
 	cols = 0;
 	i = 0;
 	while(i < s->nlines && *(s->lines[i]) == '\0') i++;
@@ -272,74 +362,18 @@ loadimages(void){
 		sdims.x /= cols;
 		sdims.y /= rows;
 
-		if(fork() == 0){
-			close(1);
-			dup(p[0], 1);
-			execl("/bin/file", "file", "-m", s->lines[i], nil);
-		}
-		wm = wait();
-		if(wm->msg != nil && *wm->msg != '\0')
-			sysfatal("%s", wm->msg);
-		free(wm);
-
-		n = read(p[1], buf, sizeof(buf));
-		buf[n - 1] = '\0'; /* replace the newline */
-
-		conv = nil;
-		for(j = 0; mimetab[j] != nil; j+=2){
-			if(strcmp(buf, mimetab[j]) == 0){
-				conv = mimetab[j+1];
-				break;
-			}
-		}
-		if(conv == nil)
-			sysfatal("unknown image format '%s'", buf);
-
-		if(fork() == 0){
-			close(1);
-			dup(p[0], 1);
-			if(*conv == '\0')
-				execl("/bin/cat", "cat", s->lines[i], nil);
-			else{
-				sprint(buf, "/bin/%s", conv);
-				execl(buf, conv, "-c", s->lines[i], nil);
-			}
-		}
-		cimg = readimage(display, p[1], 0);
+		cimg = openimage(s->lines[i]);
 		if(cimg == nil)
 			sysfatal("couldn't convert '%s': %r", s->lines[i]);
 		waitpid();
 
-		idims = subpt(cimg->r.max, cimg->r.min);
- 
-		sprint(buf, "/tmp/%s.%d.img", argv0, getpid());
-		fd = create(buf, OWRITE, 0600);
-		if(fd < 0)
-			sysfatal("couldn't open tmp file: %r");
-		writeimage(fd, cimg, 0);
-		close(fd);
-
-		if(fork() == 0){
-			close(1);
-			dup(p[0], 1);
-
-			if(idims.x < idims.y || (idims.x == idims.y && sdims.x > sdims.y)){
-				sprint(buf2, "%d", sdims.x);
-				execl("/bin/resize", "resize", "-x", buf2, buf, nil);
-			}else{
-				sprint(buf2, "%d", sdims.y);
-				execl("/bin/resize", "resize", "-y", buf2, buf, nil);
-			}
-		}
-		*nextimg = readimage(display, p[1], 0);
+		*nextimg = resizeimage(cimg, sdims);
 		if(*nextimg == nil)
 			sysfatal("couldn't scale '%s': %r", s->lines[i]);
+		freeimage(cimg);
 
 		nextimg++;
 	}
-
-	close(p[0]);
-	close(p[1]);
 }
 void
 freeimages(void){