Update nanosvg library to current upstream version

See README.bundled-libs.txt

README.bundled-libs.txt

@@ -17,21 +17,21 @@ Current versions of bundled libraries:
   Library       Version            Release date		FLTK Version
   ------------------------------------------------------------------
   jpeg          jpeg-9c            2018-01-14           1.4.0
-  nanosvg [1]   06c1f0f            2018-07-01           1.4.0
+  nanosvg       e62285a43b [1]     2019-01-31           1.4.0
   png           libpng-1.6.34      2017-09-29           1.4.0
   zlib          zlib-1.2.11        2017-01-15           1.4.0
 
-[1] Git commit: https://github.com/memononen/nanosvg
-
-
 Previous versions of bundled libraries:
 
   Library       Version            Release date		FLTK Version
   ------------------------------------------------------------------
+  nanosvg       ce81a6577c [1]     2018-07-01           1.4.0
   jpeg          jpeg-9a            2014-01-19           1.3.4
   png           libpng-1.6.16      2014-12-22           1.3.4
   zlib          zlib-1.2.8         2013-04-28           1.3.4
 
+[1] Git commit in: https://github.com/fltk/nanosvg
+    See also git tag 'fltk_yyyy-mm-dd' where yyyy-mm-dd == "Release date".
 
 General information:
 
@@ -49,7 +49,7 @@ General information:
   later is aware of changes in the source code for FLTK. Additional comments
   should be added to show the rationale, i.e. why a particular change was
   necessary. If applicable, add a reference to a Software Trouble Report
-  like "STR #3456".
+  like "STR 3456", "Issue #123", or "PR #234".
 
 
 How to update the bundled libraries:

nanosvg/nanosvg.h

@@ -29,9 +29,11 @@
 #ifndef NANOSVG_H
 #define NANOSVG_H
 
+#ifndef NANOSVG_CPLUSPLUS
 #ifdef __cplusplus
 extern "C" {
 #endif
+#endif
 
 // NanoSVG is a simple stupid single-header-file SVG parse. The output of the parser is a list of cubic bezier shapes.
 //
@@ -45,15 +47,15 @@ extern "C" {
 // NanoSVG can return the paths in few different units. For example if you want to render an image, you may choose
 // to get the paths in pixels, or if you are feeding the data into a CNC-cutter, you may want to use millimeters.
 //
-// The units passed to NanoVG should be one of: 'px', 'pt', 'pc' 'mm', 'cm', or 'in'.
+// The units passed to NanoSVG should be one of: 'px', 'pt', 'pc' 'mm', 'cm', or 'in'.
 // DPI (dots-per-inch) controls how the unit conversion is done.
 //
 // If you don't know or care about the units stuff, "px" and 96 should get you going.
 
 
 /* Example Usage:
-	// Load
+	// Load SVG
-	NSVGImage* image;
+	NSVGimage* image;
 	image = nsvgParseFromFile("test.svg", "px", 96);
 	printf("size: %f x %f\n", image->width, image->height);
 	// Use...
@@ -167,12 +169,17 @@ NSVGimage* nsvgParseFromFile(const char* filename, const char* units, float dpi)
 // Important note: changes the string.
 NSVGimage* nsvgParse(char* input, const char* units, float dpi);
 
-// Deletes list of paths.
+// Duplicates a path.
+NSVGpath* nsvgDuplicatePath(NSVGpath* p);
+
+// Deletes an image.
 void nsvgDelete(NSVGimage* image);
 
+#ifndef NANOSVG_CPLUSPLUS
 #ifdef __cplusplus
 }
 #endif
+#endif
 
 #endif // NANOSVG_H
 
@@ -1423,8 +1430,7 @@ static unsigned int nsvg__parseColor(const char* str)
 
 static float nsvg__parseOpacity(const char* str)
 {
-	float val = 0;
+	float val = nsvg__atof(str);
-	sscanf(str, "%f", &val);
 	if (val < 0.0f) val = 0.0f;
 	if (val > 1.0f) val = 1.0f;
 	return val;
@@ -1432,8 +1438,7 @@ static float nsvg__parseOpacity(const char* str)
 
 static float nsvg__parseMiterLimit(const char* str)
 {
-	float val = 0;
+	float val = nsvg__atof(str);
-	sscanf(str, "%f", &val);
 	if (val < 0.0f) val = 0.0f;
 	return val;
 }
@@ -1464,9 +1469,9 @@ static int nsvg__parseUnits(const char* units)
 static NSVGcoordinate nsvg__parseCoordinateRaw(const char* str)
 {
 	NSVGcoordinate coord = {0, NSVG_UNITS_USER};
-	char units[32]="";
+	char buf[64];
-	sscanf(str, "%f%31s", &coord.value, units);
+	coord.units = nsvg__parseUnits(nsvg__parseNumber(str, buf, 64));
-	coord.units = nsvg__parseUnits(units);
+	coord.value = nsvg__atof(buf);
 	return coord;
 }
 
@@ -2506,7 +2511,22 @@ static void nsvg__parseSVG(NSVGparser* p, const char** attr)
 			} else if (strcmp(attr[i], "height") == 0) {
 				p->image->height = nsvg__parseCoordinate(p, attr[i + 1], 0.0f, 0.0f);
 			} else if (strcmp(attr[i], "viewBox") == 0) {
-				sscanf(attr[i + 1], "%f%*[%%, \t]%f%*[%%, \t]%f%*[%%, \t]%f", &p->viewMinx, &p->viewMiny, &p->viewWidth, &p->viewHeight);
+				const char *s = attr[i + 1];
+				char buf[64];
+				s = nsvg__parseNumber(s, buf, 64);
+				p->viewMinx = nsvg__atof(buf);
+				while (*s && (nsvg__isspace(*s) || *s == '%' || *s == ',')) s++;
+				if (!*s) return;
+				s = nsvg__parseNumber(s, buf, 64);
+				p->viewMiny = nsvg__atof(buf);
+				while (*s && (nsvg__isspace(*s) || *s == '%' || *s == ',')) s++;
+				if (!*s) return;
+				s = nsvg__parseNumber(s, buf, 64);
+				p->viewWidth = nsvg__atof(buf);
+				while (*s && (nsvg__isspace(*s) || *s == '%' || *s == ',')) s++;
+				if (!*s) return;
+				s = nsvg__parseNumber(s, buf, 64);
+				p->viewHeight = nsvg__atof(buf);
 			} else if (strcmp(attr[i], "preserveAspectRatio") == 0) {
 				if (strstr(attr[i + 1], "none") != 0) {
 					// No uniform scaling
@@ -2914,6 +2934,36 @@ error:
 	return NULL;
 }
 
+NSVGpath* nsvgDuplicatePath(NSVGpath* p)
+{
+    NSVGpath* res = NULL;
+
+    if (p == NULL)
+        return NULL;
+
+    res = (NSVGpath*)malloc(sizeof(NSVGpath));
+    if (res == NULL) goto error;
+    memset(res, 0, sizeof(NSVGpath));
+
+    res->pts = (float*)malloc(p->npts*2*sizeof(float));
+    if (res->pts == NULL) goto error;
+    memcpy(res->pts, p->pts, p->npts * sizeof(float) * 2);
+    res->npts = p->npts;
+
+    memcpy(res->bounds, p->bounds, sizeof(p->bounds));
+
+    res->closed = p->closed;
+
+    return res;
+
+error:
+    if (res != NULL) {
+        free(res->pts);
+        free(res);
+    }
+    return NULL;
+}
+
 void nsvgDelete(NSVGimage* image)
 {
 	NSVGshape *snext, *shape;

nanosvg/nanosvgrast.h

@@ -31,15 +31,18 @@
 #ifndef NANOSVGRAST_H
 #define NANOSVGRAST_H
 
+#ifndef NANOSVGRAST_CPLUSPLUS
 #ifdef __cplusplus
 extern "C" {
 #endif
+#endif
 
 typedef struct NSVGrasterizer NSVGrasterizer;
 
 /* Example Usage:
 	// Load SVG
-	struct SNVGImage* image = nsvgParseFromFile("test.svg.");
+	NSVGimage* image;
+	image = nsvgParseFromFile("test.svg", "px", 96);
 
 	// Create rasterizer (can be used to render multiple images).
 	struct NSVGrasterizer* rast = nsvgCreateRasterizer();
@@ -78,9 +81,11 @@ void nsvgRasterizeXY(NSVGrasterizer* r,
 void nsvgDeleteRasterizer(NSVGrasterizer*);
 
 
+#ifndef NANOSVGRAST_CPLUSPLUS
 #ifdef __cplusplus
 }
 #endif
+#endif
 
 #endif // NANOSVGRAST_H