From d2c476115b0fdac9152e29385748bc066905ca9e Mon Sep 17 00:00:00 2001
From: Vince Weaver <vince@deater.net>
Date: Mon, 22 Mar 2021 21:29:27 -0400
Subject: [PATCH] gr-utils: add a png to 16x16 util

---
 utils/gr-utils/Makefile    | 21 ++++++---
 utils/gr-utils/loadpng.c   | 10 ++++
 utils/gr-utils/loadpng.h   |  1 +
 utils/gr-utils/png_16x16.c | 95 ++++++++++++++++++++++++++++++++++++++
 4 files changed, 120 insertions(+), 7 deletions(-)
 create mode 100644 utils/gr-utils/png_16x16.c

diff --git a/utils/gr-utils/Makefile b/utils/gr-utils/Makefile
index 3d7a3411..cc449197 100644
--- a/utils/gr-utils/Makefile
+++ b/utils/gr-utils/Makefile
@@ -3,7 +3,7 @@ include ../../Makefile.inc
 CFLAGS = -g -Wall -O2
 
 all:	text2gr png2gr png2gr_text png2rle png2lz4 png_to_40x48d png_to_40x96 \
-	png2sixbitmap png2six80 png2sixrle png2fourrle png2sixrle2
+	png2sixbitmap png2six80 png2sixrle png2fourrle png2sixrle2 png_16x16
 
 
 ###
@@ -47,11 +47,11 @@ png2sixbitmap.o:		png2sixbitmap.c loadpng.h
 
 ###
 
-png2sixrle:		png2sixrle.o loadpng.o
-	$(CC) $(LFLAGS) -o png2sixrle png2sixrle.o loadpng.o -lpng
+png_16x16:		png_16x16.o loadpng.o
+	$(CC) $(LFLAGS) -o png_16x16 png_16x16.o loadpng.o -lpng
 
-png2sixrle.o:		png2sixrle.c loadpng.h
-	$(CC) $(CFLAGS) -c png2sixrle.c
+png_16x16.o:		png_16x16.c loadpng.h
+	$(CC) $(CFLAGS) -c png_16x16.c
 
 ###
 
@@ -61,6 +61,13 @@ png2fourrle:		png2fourrle.o loadpng.o
 png2fourrle.o:		png2fourrle.c loadpng.h
 	$(CC) $(CFLAGS) -c png2fourrle.c
 
+###
+
+png2sixrle:		png2sixrle.o loadpng.o
+	$(CC) $(LFLAGS) -o png2sixrle png2sixrle.o loadpng.o -lpng
+
+png2sixrle.o:		png2sixrle.c loadpng.h
+	$(CC) $(CFLAGS) -c png2sixrle.c
 
 ###
 
@@ -120,8 +127,8 @@ png_to_40x96.o:		png_to_40x96.c loadpng.h rle_common.h
 ###
 
 install:	
-		cp png2gr png2gr_text png2rle png2lz4 png_to_40x48d png_to_40x96 png2sixbitmap png2sixrle png2sixrle2 png2fourrle png2six80 $(INSTALL_LOC)
+		cp png2gr png2gr_text png2rle png2lz4 png_to_40x48d png_to_40x96 png2sixbitmap png2sixrle png2sixrle2 png2fourrle png2six80 png_16x16 $(INSTALL_LOC)
 
 clean:		
-		rm -f *~ *.o png2gr png2gr_text png2rle png2lz4 png_to_40x48d png_to_40x96 png2sixbitmap png2sixrle png2fourrle png2sixrle2 png2six80 text2gr pnglarge2rle
+		rm -f *~ *.o png2gr png2gr_text png2rle png2lz4 png_to_40x48d png_to_40x96 png2sixbitmap png2sixrle png2fourrle png2sixrle2 png2six80 text2gr pnglarge2rle png_16x16
 
diff --git a/utils/gr-utils/loadpng.c b/utils/gr-utils/loadpng.c
index 737fcb96..9190bfcc 100644
--- a/utils/gr-utils/loadpng.c
+++ b/utils/gr-utils/loadpng.c
@@ -114,6 +114,10 @@ int loadpng(char *filename, unsigned char **image_ptr, int *xsize, int *ysize,
 		*xsize=40;
 		xadd=2;
 	}
+	else if (width==16) {
+		*xsize=16;
+		xadd=1;
+	}
 	else {
 		fprintf(stderr,"Unsupported width %d\n",width);
 		return -1;
@@ -134,6 +138,12 @@ int loadpng(char *filename, unsigned char **image_ptr, int *xsize, int *ysize,
 		ystart=0;
 		yadd=4;
 	}
+	else if (png_type==PNG_RAW) {
+		/* FIXME, not working */
+		*ysize=height;
+		ystart=0;
+		yadd=1;
+	}
 	else {
 		fprintf(stderr,"Unknown PNG type\n");
 		return -1;
diff --git a/utils/gr-utils/loadpng.h b/utils/gr-utils/loadpng.h
index 51882f61..e4728866 100644
--- a/utils/gr-utils/loadpng.h
+++ b/utils/gr-utils/loadpng.h
@@ -1,6 +1,7 @@
 #define PNG_WHOLETHING	0
 #define PNG_ODDLINES	1
 #define PNG_EVENLINES	2
+#define PNG_RAW		3
 
 int loadpng(char *filename, unsigned char **image_ptr, int *xsize, int *ysize,
 	int png_type);
diff --git a/utils/gr-utils/png_16x16.c b/utils/gr-utils/png_16x16.c
new file mode 100644
index 00000000..3d74139b
--- /dev/null
+++ b/utils/gr-utils/png_16x16.c
@@ -0,0 +1,95 @@
+/* Convert 16x16 PNGs to 8+128 text for use in AppleII Basic bot loader */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <unistd.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdarg.h>
+
+#include "loadpng.h"
+
+static int color_count=0;
+static int colors[16];
+
+static int find_color(int which) {
+	int i;
+
+	for(i=0;i<color_count;i++) {
+		if (colors[i]==which) {
+//			printf("Found %d at %d\n",which,i);
+			return i;
+		}
+	}
+
+	/* not found */
+	colors[color_count]=which;
+//	printf("New %d at %d\n",which,color_count);
+	color_count++;
+
+	return color_count-1;
+}
+
+int main(int argc, char **argv) {
+
+	int i = 0, row,col;
+	unsigned char in[1024];
+	int op=0;
+	int color;
+
+	unsigned char *image;
+	int xsize,ysize;
+
+	if (argc<2) {
+		fprintf(stderr,"Usage:\t%s INFILE\n\n",argv[0]);
+		exit(-1);
+	}
+
+	if (loadpng(argv[1],&image,&xsize,&ysize,PNG_WHOLETHING)<0) {
+		fprintf(stderr,"Error loading png!\n");
+		exit(-1);
+	}
+
+	fprintf(stderr,"Loaded image %d by %d\n",xsize,ysize);
+
+	memset(in,0,sizeof(in));
+
+	memset(colors,0,sizeof(colors));
+
+	for(row=0;row<ysize;row+=2) {
+		for(i=0;i<2;i++) {
+			for(col=0;col<xsize;col++) {
+				if (i==0) {
+					color=find_color(image[row/2*xsize+col]&0xf);
+				}
+				else {
+					color=find_color(image[row/2*xsize+col]>>4);
+				}
+				in[op]=color;
+				op++;
+			}
+		}
+	}
+
+	printf("Raw Image was %d bytes, %d colors\n",op,color_count);
+
+#if 0
+	for(i=0;i<color_count;i++) {
+		printf("Color %d = %d (%c)\n",i,colors[i],colors[i]+35);
+	}
+
+	for(i=0;i<op;i++) {
+		printf("%d,",in[i]);
+		if (i%16==15) printf("\n");
+	}
+#endif
+	for(i=0;i<8;i++) printf("%c",colors[i]+35);
+
+	for(i=0;i<op;i+=2) printf("%c",((in[i+1]<<3)+in[i])+35);
+
+	printf("\n");
+
+	return 0;
+}