From 9d1111afe554231e89dcaa574234ecd1813526a4 Mon Sep 17 00:00:00 2001
From: Mikko Rasa <tdb@tdb.fi>
Date: Fri, 23 Nov 2012 20:12:41 +0200
Subject: [PATCH] Use stricter warnings and make the code compile with them

---
 Makefile  |  2 +-
 ttf2png.c | 30 +++++++++++++++++-------------
 2 files changed, 18 insertions(+), 14 deletions(-)

diff --git a/Makefile b/Makefile
index 6219108..0bc7aad 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,5 @@
 ttf2png: ttf2png.c
-	gcc -Wall $^ -o $@ $(shell freetype-config --cflags --libs) $(shell pkg-config --cflags --libs libpng12)
+	gcc -Wall -Wextra -Werror -std=c89 -pedantic $^ -o $@ $(shell freetype-config --cflags --libs) $(shell pkg-config --cflags --libs libpng12)
 
 VER=0.3
 
diff --git a/ttf2png.c b/ttf2png.c
index e702c9f..ebc0ccc 100644
--- a/ttf2png.c
+++ b/ttf2png.c
@@ -240,14 +240,14 @@ int main(int argc, char **argv)
 		render_grid(&font, cellw, cellh, cpl, seq);
 	if(invert)
 	{
-		for(i=0; i<font.image.w*font.image.h; ++i)
+		for(i=0; (unsigned)i<font.image.w*font.image.h; ++i)
 			font.image.data[i] = 255-font.image.data[i];
 	}
 	save_png(out_fn, &font.image, alpha);
 	if(def_fn)
 		save_defs(def_fn, &font);
 
-	for(i=0; i<font.n_glyphs; ++i)
+	for(i=0; (unsigned)i<font.n_glyphs; ++i)
 		free(font.glyphs[i].image.data);
 	free(font.glyphs);
 	free(font.image.data);
@@ -274,15 +274,17 @@ void usage()
 {
 	printf("ttf2png - True Type Font to PNG converter\n"
 		"Copyright (c) 2004-2008  Mikko Rasa, Mikkosoft Productions\n"
-		"Distributed under the GNU General Public License\n\n"
-		"Usage: ttf2png [options] <TTF file>\n\n"
-		"Accepted options (default values in [brackets])\n"
+		"Distributed under the GNU General Public License\n\n");
+
+	printf("Usage: ttf2png [options] <TTF file>\n\n");
+
+	printf("Accepted options (default values in [brackets])\n"
 		"  -r  Range of characters to convert [0,255]\n"
 		"  -s  Font size to use, in pixels [10]\n"
 		"  -l  Number of characters to put in one line [auto]\n"
 		"  -c  Character cell size, in pixels [auto]\n"
-		"  -o  Output file name (or - for stdout) [font.png]\n"
-		"  -a  Force autohinter\n"
+		"  -o  Output file name (or - for stdout) [font.png]\n");
+	printf("  -a  Force autohinter\n"
 		"  -t  Render glyphs to alpha channel\n"
 		"  -i  Invert colors of the glyphs\n"
 		"  -v  Increase the level of verbosity\n"
@@ -443,7 +445,7 @@ void render_grid(Font *font, unsigned cellw, unsigned cellh, unsigned cpl, int s
 		printf("Max size:  %u x %u\n", maxw, maxh);
 		printf("Y range:   [%d %d]\n", bot, top);
 		printf("Cell size: %u x %u\n", cellw, cellh);
-		if(maxw>cellw || top-bot>cellh)
+		if(maxw>cellw || (unsigned)(top-bot)>cellh)
 			fprintf(stderr, "Warning: character size exceeds cell size\n");
 	}
 
@@ -473,7 +475,7 @@ void render_grid(Font *font, unsigned cellw, unsigned cellh, unsigned cpl, int s
 	for(i=0; i<font->n_glyphs; ++i)
 	{
 		Glyph    *glyph;
-		int      ci, cx, cy;
+		unsigned ci, cx, cy;
 		unsigned x, y;
 
 		glyph = &font->glyphs[i];
@@ -495,7 +497,7 @@ void render_grid(Font *font, unsigned cellw, unsigned cellh, unsigned cpl, int s
 
 		for(y=0; y<glyph->image.h; ++y) for(x=0; x<glyph->image.w; ++x)
 		{
-			if(cx+x<0 || cx+x>=font->image.w || cy+y<0 || cy+y>=font->image.h)
+			if(cx+x>=font->image.w || cy+y>=font->image.h)
 				continue;
 			font->image.data[cx+x+(cy+y)*font->image.w] = 255-glyph->image.data[x+y*glyph->image.w];
 		}
@@ -599,7 +601,7 @@ void render_packed(Font *font)
 
 		for(y=0; y<glyph->image.h; ++y) for(x=0; x<glyph->image.w; ++x)
 		{
-			if(cx+x<0 || cx+x>=font->image.w || cy+y<0 || cy+y>=font->image.h)
+			if(cx+x>=font->image.w || cy+y>=font->image.h)
 				continue;
 			font->image.data[cx+x+(cy+y)*font->image.w] = 255-glyph->image.data[x+y*glyph->image.w];
 		}
@@ -660,8 +662,8 @@ int save_png(const char *fn, const Image *image, char alpha)
 	FILE       *out;
 	png_struct *pngs;
 	png_info   *pngi;
-	png_byte   *rows[image->h];
-	int        i;
+	png_byte   **rows;
+	unsigned   i;
 	png_byte   *data2;
 	int        color;
 
@@ -692,6 +694,7 @@ int save_png(const char *fn, const Image *image, char alpha)
 	}
 
 	png_init_io(pngs, out);
+	rows = (png_byte **)malloc(image->h*sizeof(png_byte *));
 	if(alpha)
 	{
 		data2 = (png_byte *)malloc(image->w*image->h*2);
@@ -714,6 +717,7 @@ int save_png(const char *fn, const Image *image, char alpha)
 	png_set_rows(pngs, pngi, rows);
 	png_write_png(pngs, pngi, PNG_TRANSFORM_IDENTITY, NULL);
 	png_destroy_write_struct(&pngs, &pngi);
+	free(rows);
 	if(alpha)
 		free(data2);
 
-- 
2.43.0