ref: b9ff09189979b272200d32668b4e42f292512dcd
dir: /nanosvg.h/
/*
* Copyright (c) 2013-14 Mikko Mononen memon@inside.org
*
* This software is provided 'as-is', without any express or implied
* warranty. In no event will the authors be held liable for any damages
* arising from the use of this software.
*
* Permission is granted to anyone to use this software for any purpose,
* including commercial applications, and to alter it and redistribute it
* freely, subject to the following restrictions:
*
* 1. The origin of this software must not be misrepresented; you must not
* claim that you wrote the original software. If you use this software
* in a product, an acknowledgment in the product documentation would be
* appreciated but is not required.
* 2. Altered source versions must be plainly marked as such, and must not be
* misrepresented as being the original software.
* 3. This notice may not be removed or altered from any source distribution.
*
* The SVG parser is based on Anti-Grain Geometry 2.4 SVG example
* Copyright (C) 2002-2004 Maxim Shemanarev (McSeem) (http://www.antigrain.com/)
*
* Arc calculation code based on canvg (https://code.google.com/p/canvg/)
*
* Bounding box calculation based on http://blog.hackers-cafe.net/2009/06/how-to-calculate-bezier-curves-bounding.html
*
*/
#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.
//
// The library suits well for anything from rendering scalable icons in your editor application to prototyping a game.
//
// NanoSVG supports a wide range of SVG features, but something may be missing, feel free to create a pull request!
//
// The shapes in the SVG images are transformed by the viewBox and converted to specified units.
// That is, you should get the same looking data as your designed in your favorite app.
//
// 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 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 SVG
NSVGimage* image;
image = nsvgParseFromFile("test.svg", "px", 96);
printf("size: %f x %f\n", image->width, image->height);
// Use...
for (NSVGshape *shape = image->shapes; shape != NULL; shape = shape->next) {
for (NSVGpath *path = shape->paths; path != NULL; path = path->next) {
for (int i = 0; i < path->npts-1; i += 3) {
float* p = &path->pts[i*2];
drawCubicBez(p[0],p[1], p[2],p[3], p[4],p[5], p[6],p[7]);
}
}
}
// Delete
nsvgDelete(image);
*/
enum NSVGpaintType {
NSVG_PAINT_NONE = 0,
NSVG_PAINT_COLOR = 1,
NSVG_PAINT_LINEAR_GRADIENT = 2,
NSVG_PAINT_RADIAL_GRADIENT = 3
};
enum NSVGspreadType {
NSVG_SPREAD_PAD = 0,
NSVG_SPREAD_REFLECT = 1,
NSVG_SPREAD_REPEAT = 2
};
enum NSVGlineJoin {
NSVG_JOIN_MITER = 0,
NSVG_JOIN_ROUND = 1,
NSVG_JOIN_BEVEL = 2
};
enum NSVGlineCap {
NSVG_CAP_BUTT = 0,
NSVG_CAP_ROUND = 1,
NSVG_CAP_SQUARE = 2
};
enum NSVGfillRule {
NSVG_FILLRULE_NONZERO = 0,
NSVG_FILLRULE_EVENODD = 1
};
enum NSVGflags {
NSVG_FLAGS_VISIBLE = 0x01
};
typedef struct NSVGgradientStop {
unsigned int color;
float offset;
} NSVGgradientStop;
typedef struct NSVGgradient {
float xform[6];
char spread;
float fx, fy;
int nstops;
NSVGgradientStop stops[1];
} NSVGgradient;
typedef struct NSVGpaint {
char type;
union {
unsigned int color;
NSVGgradient* gradient;
};
} NSVGpaint;
typedef struct NSVGpath
{
float* pts; // Cubic bezier points: x0,y0, [cpx1,cpx1,cpx2,cpy2,x1,y1], ...
int npts; // Total number of bezier points.
char closed; // Flag indicating if shapes should be treated as closed.
float bounds[4]; // Tight bounding box of the shape [minx,miny,maxx,maxy].
struct NSVGpath* next; // Pointer to next path, or NULL if last element.
} NSVGpath;
typedef struct NSVGshape
{
char id[64]; // Optional 'id' attr of the shape or its group
NSVGpaint fill; // Fill paint
NSVGpaint stroke; // Stroke paint
float opacity; // Opacity of the shape.
float strokeWidth; // Stroke width (scaled).
float strokeDashOffset; // Stroke dash offset (scaled).
float strokeDashArray[8]; // Stroke dash array (scaled).
char strokeDashCount; // Number of dash values in dash array.
char strokeLineJoin; // Stroke join type.
char strokeLineCap; // Stroke cap type.
float miterLimit; // Miter limit
char fillRule; // Fill rule, see NSVGfillRule.
unsigned char flags; // Logical or of NSVG_FLAGS_* flags
float bounds[4]; // Tight bounding box of the shape [minx,miny,maxx,maxy].
NSVGpath* paths; // Linked list of paths in the image.
struct NSVGshape* next; // Pointer to next shape, or NULL if last element.
} NSVGshape;
typedef struct NSVGimage
{
float width; // Width of the image.
float height; // Height of the image.
NSVGshape* shapes; // Linked list of shapes in the image.
} NSVGimage;
// Parses SVG file from a file, returns SVG image as paths.
NSVGimage* nsvgParseFromFile(const char* filename, const char* units, float dpi);
// Parses SVG file from a null terminated string, returns SVG image as paths.
// Important note: changes the string.
NSVGimage* nsvgParse(char* input, const char* units, float dpi);
// Duplicates a path.
NSVGpath* nsvgDuplicatePath(NSVGpath* p);
// Deletes an image.
void nsvgDelete(NSVGimage* image);
#ifndef NANOSVG_CPLUSPLUS
#ifdef __cplusplus
}
#endif
#endif
#endif // NANOSVG_H
#ifdef NANOSVG_IMPLEMENTATION
#include <string.h>
#include <stdlib.h>
#include <math.h>
#define NSVG_PI (3.14159265358979323846264338327f)
#define NSVG_KAPPA90 (0.5522847493f) // Length proportional to radius of a cubic bezier handle for 90deg arcs.
#define NSVG_ALIGN_MIN 0
#define NSVG_ALIGN_MID 1
#define NSVG_ALIGN_MAX 2
#define NSVG_ALIGN_NONE 0
#define NSVG_ALIGN_MEET 1
#define NSVG_ALIGN_SLICE 2
#define NSVG_NOTUSED(v) do { (void)(1 ? (void)0 : ( (void)(v) ) ); } while(0)
#define NSVG_RGB(r, g, b) (((unsigned int)r) | ((unsigned int)g << 8) | ((unsigned int)b << 16))
#ifdef _MSC_VER
#pragma warning (disable: 4996) // Switch off security warnings
#pragma warning (disable: 4100) // Switch off unreferenced formal parameter warnings
#ifdef __cplusplus
#define NSVG_INLINE inline
#else
#define NSVG_INLINE
#endif
#else
#define NSVG_INLINE inline
#endif
static int nsvg__isspace(char c)
{
return strchr(" \t\n\v\f\r", c) != 0;
}
static int nsvg__isdigit(char c)
{
return c >= '0' && c <= '9';
}
static NSVG_INLINE float nsvg__minf(float a, float b) { return a < b ? a : b; }
static NSVG_INLINE float nsvg__maxf(float a, float b) { return a > b ? a : b; }
// Simple XML parser
#define NSVG_XML_TAG 1
#define NSVG_XML_CONTENT 2
#define NSVG_XML_MAX_ATTRIBS 256
static void nsvg__parseContent(char* s,
void (*contentCb)(void* ud, const char* s),
void* ud)
{
// Trim start white spaces
while (*s && nsvg__isspace(*s)) s++;
if (!*s) return;
if (contentCb)
(*contentCb)(ud, s);
}
static void nsvg__parseElement(char* s,
void (*startelCb)(void* ud, const char* el, const char** attr),
void (*endelCb)(void* ud, const char* el),
void* ud)
{
const char* attr[NSVG_XML_MAX_ATTRIBS];
int nattr = 0;
char* name;
int start = 0;
int end = 0;
char quote;
// Skip white space after the '<'
while (*s && nsvg__isspace(*s)) s++;
// Check if the tag is end tag
if (*s == '/') {
s++;
end = 1;
} else {
start = 1;
}
// Skip comments, data and preprocessor stuff.
if (!*s || *s == '?' || *s == '!')
return;
// Get tag name
name = s;
while (*s && !nsvg__isspace(*s)) s++;
if (*s) { *s++ = '\0'; }
// Get attribs
while (!end && *s && nattr < NSVG_XML_MAX_ATTRIBS-3) {
char* name = NULL;
char* value = NULL;
// Skip white space before the attrib name
while (*s && nsvg__isspace(*s)) s++;
if (!*s) break;
if (*s == '/') {
end = 1;
break;
}
name = s;
// Find end of the attrib name.
while (*s && !nsvg__isspace(*s) && *s != '=') s++;
if (*s) { *s++ = '\0'; }
// Skip until the beginning of the value.
while (*s && *s != '\"' && *s != '\'') s++;
if (!*s) break;
quote = *s;
s++;
// Store value and find the end of it.
value = s;
while (*s && *s != quote) s++;
if (*s) { *s++ = '\0'; }
// Store only well formed attributes
if (name && value) {
attr[nattr++] = name;
attr[nattr++] = value;
}
}
// List terminator
attr[nattr++] = 0;
attr[nattr++] = 0;
// Call callbacks.
if (start && startelCb)
(*startelCb)(ud, name, attr);
if (end && endelCb)
(*endelCb)(ud, name);
}
int nsvg__parseXML(char* input,
void (*startelCb)(void* ud, const char* el, const char** attr),
void (*endelCb)(void* ud, const char* el),
void (*contentCb)(void* ud, const char* s),
void* ud)
{
char* s = input;
char* mark = s;
int state = NSVG_XML_CONTENT;
while (*s) {
if (*s == '<' && state == NSVG_XML_CONTENT) {
// Start of a tag
*s++ = '\0';
nsvg__parseContent(mark, contentCb, ud);
mark = s;
state = NSVG_XML_TAG;
} else if (*s == '>' && state == NSVG_XML_TAG) {
// Start of a content or new tag.
*s++ = '\0';
nsvg__parseElement(mark, startelCb, endelCb, ud);
mark = s;
state = NSVG_XML_CONTENT;
} else {
s++;
}
}
return 1;
}
/* Simple SVG parser. */
#define NSVG_MAX_ATTR 128
enum NSVGgradientUnits {
NSVG_USER_SPACE = 0,
NSVG_OBJECT_SPACE = 1
};
#define NSVG_MAX_DASHES 8
enum NSVGunits {
NSVG_UNITS_USER,
NSVG_UNITS_PX,
NSVG_UNITS_PT,
NSVG_UNITS_PC,
NSVG_UNITS_MM,
NSVG_UNITS_CM,
NSVG_UNITS_IN,
NSVG_UNITS_PERCENT,
NSVG_UNITS_EM,
NSVG_UNITS_EX
};
typedef struct NSVGcoordinate {
float value;
int units;
} NSVGcoordinate;
typedef struct NSVGlinearData {
NSVGcoordinate x1, y1, x2, y2;
} NSVGlinearData;
typedef struct NSVGradialData {
NSVGcoordinate cx, cy, r, fx, fy;
} NSVGradialData;
typedef struct NSVGgradientData
{
char id[64];
char ref[64];
char type;
union {
NSVGlinearData linear;
NSVGradialData radial;
};
char spread;
char units;
float xform[6];
int nstops;
NSVGgradientStop* stops;
struct NSVGgradientData* next;
} NSVGgradientData;
typedef struct NSVGattrib
{
char id[64];
float xform[6];
unsigned int fillColor;
unsigned int strokeColor;
float opacity;
float fillOpacity;
float strokeOpacity;
char fillGradient[64];
char strokeGradient[64];
float strokeWidth;
float strokeDashOffset;
float strokeDashArray[NSVG_MAX_DASHES];
int strokeDashCount;
char strokeLineJoin;
char strokeLineCap;
float miterLimit;
char fillRule;
float fontSize;
unsigned int stopColor;
float stopOpacity;
float stopOffset;
char hasFill;
char hasStroke;
char visible;
} NSVGattrib;
typedef struct NSVGparser
{
NSVGattrib attr[NSVG_MAX_ATTR];
int attrHead;
float* pts;
int npts;
int cpts;
NSVGpath* plist;
NSVGimage* image;
NSVGgradientData* gradients;
NSVGshape* shapesTail;
float viewMinx, viewMiny, viewWidth, viewHeight;
int alignX, alignY, alignType;
float dpi;
char pathFlag;
char defsFlag;
} NSVGparser;
static void nsvg__xformIdentity(float* t)
{
t[0] = 1.0f; t[1] = 0.0f;
t[2] = 0.0f; t[3] = 1.0f;
t[4] = 0.0f; t[5] = 0.0f;
}
static void nsvg__xformSetTranslation(float* t, float tx, float ty)
{
t[0] = 1.0f; t[1] = 0.0f;
t[2] = 0.0f; t[3] = 1.0f;
t[4] = tx; t[5] = ty;
}
static void nsvg__xformSetScale(float* t, float sx, float sy)
{
t[0] = sx; t[1] = 0.0f;
t[2] = 0.0f; t[3] = sy;
t[4] = 0.0f; t[5] = 0.0f;
}
static void nsvg__xformSetSkewX(float* t, float a)
{
t[0] = 1.0f; t[1] = 0.0f;
t[2] = tanf(a); t[3] = 1.0f;
t[4] = 0.0f; t[5] = 0.0f;
}
static void nsvg__xformSetSkewY(float* t, float a)
{
t[0] = 1.0f; t[1] = tanf(a);
t[2] = 0.0f; t[3] = 1.0f;
t[4] = 0.0f; t[5] = 0.0f;
}
static void nsvg__xformSetRotation(float* t, float a)
{
float cs = cosf(a), sn = sinf(a);
t[0] = cs; t[1] = sn;
t[2] = -sn; t[3] = cs;
t[4] = 0.0f; t[5] = 0.0f;
}
static void nsvg__xformMultiply(float* t, float* s)
{
float t0 = t[0] * s[0] + t[1] * s[2];
float t2 = t[2] * s[0] + t[3] * s[2];
float t4 = t[4] * s[0] + t[5] * s[2] + s[4];
t[1] = t[0] * s[1] + t[1] * s[3];
t[3] = t[2] * s[1] + t[3] * s[3];
t[5] = t[4] * s[1] + t[5] * s[3] + s[5];
t[0] = t0;
t[2] = t2;
t[4] = t4;
}
static void nsvg__xformInverse(float* inv, float* t)
{
double invdet, det = (double)t[0] * t[3] - (double)t[2] * t[1];
if (det > -1e-6 && det < 1e-6) {
nsvg__xformIdentity(t);
return;
}
invdet = 1.0 / det;
inv[0] = (float)(t[3] * invdet);
inv[2] = (float)(-t[2] * invdet);
inv[4] = (float)(((double)t[2] * t[5] - (double)t[3] * t[4]) * invdet);
inv[1] = (float)(-t[1] * invdet);
inv[3] = (float)(t[0] * invdet);
inv[5] = (float)(((double)t[1] * t[4] - (double)t[0] * t[5]) * invdet);
}
static void nsvg__xformPremultiply(float* t, float* s)
{
float s2[6];
memcpy(s2, s, sizeof(float)*6);
nsvg__xformMultiply(s2, t);
memcpy(t, s2, sizeof(float)*6);
}
static void nsvg__xformPoint(float* dx, float* dy, float x, float y, float* t)
{
*dx = x*t[0] + y*t[2] + t[4];
*dy = x*t[1] + y*t[3] + t[5];
}
static void nsvg__xformVec(float* dx, float* dy, float x, float y, float* t)
{
*dx = x*t[0] + y*t[2];
*dy = x*t[1] + y*t[3];
}
#define NSVG_EPSILON (1e-12)
static int nsvg__ptInBounds(float* pt, float* bounds)
{
return pt[0] >= bounds[0] && pt[0] <= bounds[2] && pt[1] >= bounds[1] && pt[1] <= bounds[3];
}
static double nsvg__evalBezier(double t, double p0, double p1, double p2, double p3)
{
double it = 1.0-t;
return it*it*it*p0 + 3.0*it*it*t*p1 + 3.0*it*t*t*p2 + t*t*t*p3;
}
static void nsvg__curveBounds(float* bounds, float* curve)
{
int i, j, count;
double roots[2], a, b, c, b2ac, t, v;
float* v0 = &curve[0];
float* v1 = &curve[2];
float* v2 = &curve[4];
float* v3 = &curve[6];
// Start the bounding box by end points
bounds[0] = nsvg__minf(v0[0], v3[0]);
bounds[1] = nsvg__minf(v0[1], v3[1]);
bounds[2] = nsvg__maxf(v0[0], v3[0]);
bounds[3] = nsvg__maxf(v0[1], v3[1]);
// Bezier curve fits inside the convex hull of it's control points.
// If control points are inside the bounds, we're done.
if (nsvg__ptInBounds(v1, bounds) && nsvg__ptInBounds(v2, bounds))
return;
// Add bezier curve inflection points in X and Y.
for (i = 0; i < 2; i++) {
a = -3.0 * v0[i] + 9.0 * v1[i] - 9.0 * v2[i] + 3.0 * v3[i];
b = 6.0 * v0[i] - 12.0 * v1[i] + 6.0 * v2[i];
c = 3.0 * v1[i] - 3.0 * v0[i];
count = 0;
if (fabs(a) < NSVG_EPSILON) {
if (fabs(b) > NSVG_EPSILON) {
t = -c / b;
if (t > NSVG_EPSILON && t < 1.0-NSVG_EPSILON)
roots[count++] = t;
}
} else {
b2ac = b*b - 4.0*c*a;
if (b2ac > NSVG_EPSILON) {
t = (-b + sqrt(b2ac)) / (2.0 * a);
if (t > NSVG_EPSILON && t < 1.0-NSVG_EPSILON)
roots[count++] = t;
t = (-b - sqrt(b2ac)) / (2.0 * a);
if (t > NSVG_EPSILON && t < 1.0-NSVG_EPSILON)
roots[count++] = t;
}
}
for (j = 0; j < count; j++) {
v = nsvg__evalBezier(roots[j], v0[i], v1[i], v2[i], v3[i]);
bounds[0+i] = nsvg__minf(bounds[0+i], (float)v);
bounds[2+i] = nsvg__maxf(bounds[2+i], (float)v);
}
}
}
static NSVGparser* nsvg__createParser(void)
{
NSVGparser* p;
p = (NSVGparser*)malloc(sizeof(NSVGparser));
if (p == NULL) goto error;
memset(p, 0, sizeof(NSVGparser));
p->image = (NSVGimage*)malloc(sizeof(NSVGimage));
if (p->image == NULL) goto error;
memset(p->image, 0, sizeof(NSVGimage));
// Init style
nsvg__xformIdentity(p->attr[0].xform);
memset(p->attr[0].id, 0, sizeof p->attr[0].id);
p->attr[0].fillColor = NSVG_RGB(0,0,0);
p->attr[0].strokeColor = NSVG_RGB(0,0,0);
p->attr[0].opacity = 1;
p->attr[0].fillOpacity = 1;
p->attr[0].strokeOpacity = 1;
p->attr[0].stopOpacity = 1;
p->attr[0].strokeWidth = 1;
p->attr[0].strokeLineJoin = NSVG_JOIN_MITER;
p->attr[0].strokeLineCap = NSVG_CAP_BUTT;
p->attr[0].miterLimit = 4;
p->attr[0].fillRule = NSVG_FILLRULE_NONZERO;
p->attr[0].hasFill = 1;
p->attr[0].visible = 1;
return p;
error:
if (p) {
if (p->image) free(p->image);
free(p);
}
return NULL;
}
static void nsvg__deletePaths(NSVGpath* path)
{
while (path) {
NSVGpath *next = path->next;
if (path->pts != NULL)
free(path->pts);
free(path);
path = next;
}
}
static void nsvg__deletePaint(NSVGpaint* paint)
{
if (paint->type == NSVG_PAINT_LINEAR_GRADIENT || paint->type == NSVG_PAINT_RADIAL_GRADIENT)
free(paint->gradient);
}
static void nsvg__deleteGradientData(NSVGgradientData* grad)
{
NSVGgradientData* next;
while (grad != NULL) {
next = grad->next;
free(grad->stops);
free(grad);
grad = next;
}
}
static void nsvg__deleteParser(NSVGparser* p)
{
if (p != NULL) {
nsvg__deletePaths(p->plist);
nsvg__deleteGradientData(p->gradients);
nsvgDelete(p->image);
free(p->pts);
free(p);
}
}
static void nsvg__resetPath(NSVGparser* p)
{
p->npts = 0;
}
static void nsvg__addPoint(NSVGparser* p, float x, float y)
{
if (p->npts+1 > p->cpts) {
p->cpts = p->cpts ? p->cpts*2 : 8;
p->pts = (float*)realloc(p->pts, p->cpts*2*sizeof(float));
if (!p->pts) return;
}
p->pts[p->npts*2+0] = x;
p->pts[p->npts*2+1] = y;
p->npts++;
}
static void nsvg__moveTo(NSVGparser* p, float x, float y)
{
if (p->npts > 0) {
p->pts[(p->npts-1)*2+0] = x;
p->pts[(p->npts-1)*2+1] = y;
} else {
nsvg__addPoint(p, x, y);
}
}
static void nsvg__lineTo(NSVGparser* p, float x, float y)
{
float px,py, dx,dy;
if (p->npts > 0) {
px = p->pts[(p->npts-1)*2+0];
py = p->pts[(p->npts-1)*2+1];
dx = x - px;
dy = y - py;
nsvg__addPoint(p, px + dx/3.0f, py + dy/3.0f);
nsvg__addPoint(p, x - dx/3.0f, y - dy/3.0f);
nsvg__addPoint(p, x, y);
}
}
static void nsvg__cubicBezTo(NSVGparser* p, float cpx1, float cpy1, float cpx2, float cpy2, float x, float y)
{
if (p->npts > 0) {
nsvg__addPoint(p, cpx1, cpy1);
nsvg__addPoint(p, cpx2, cpy2);
nsvg__addPoint(p, x, y);
}
}
static NSVGattrib* nsvg__getAttr(NSVGparser* p)
{
return &p->attr[p->attrHead];
}
static void nsvg__pushAttr(NSVGparser* p)
{
if (p->attrHead < NSVG_MAX_ATTR-1) {
p->attrHead++;
memcpy(&p->attr[p->attrHead], &p->attr[p->attrHead-1], sizeof(NSVGattrib));
}
}
static void nsvg__popAttr(NSVGparser* p)
{
if (p->attrHead > 0)
p->attrHead--;
}
static float nsvg__actualOrigX(NSVGparser* p)
{
return p->viewMinx;
}
static float nsvg__actualOrigY(NSVGparser* p)
{
return p->viewMiny;
}
static float nsvg__actualWidth(NSVGparser* p)
{
return p->viewWidth;
}
static float nsvg__actualHeight(NSVGparser* p)
{
return p->viewHeight;
}
static float nsvg__actualLength(NSVGparser* p)
{
float w = nsvg__actualWidth(p), h = nsvg__actualHeight(p);
return sqrtf(w*w + h*h) / sqrtf(2.0f);
}
static float nsvg__convertToPixels(NSVGparser* p, NSVGcoordinate c, float orig, float length)
{
NSVGattrib* attr = nsvg__getAttr(p);
switch (c.units) {
case NSVG_UNITS_USER: return c.value;
case NSVG_UNITS_PX: return c.value;
case NSVG_UNITS_PT: return c.value / 72.0f * p->dpi;
case NSVG_UNITS_PC: return c.value / 6.0f * p->dpi;
case NSVG_UNITS_MM: return c.value / 25.4f * p->dpi;
case NSVG_UNITS_CM: return c.value / 2.54f * p->dpi;
case NSVG_UNITS_IN: return c.value * p->dpi;
case NSVG_UNITS_EM: return c.value * attr->fontSize;
case NSVG_UNITS_EX: return c.value * attr->fontSize * 0.52f; // x-height of Helvetica.
case NSVG_UNITS_PERCENT: return orig + c.value / 100.0f * length;
default: return c.value;
}
return c.value;
}
static NSVGgradientData* nsvg__findGradientData(NSVGparser* p, const char* id)
{
NSVGgradientData* grad = p->gradients;
if (id == NULL || *id == '\0')
return NULL;
while (grad != NULL) {
if (strcmp(grad->id, id) == 0)
return grad;
grad = grad->next;
}
return NULL;
}
static NSVGgradient* nsvg__createGradient(NSVGparser* p, const char* id, const float* localBounds, char* paintType)
{
NSVGattrib* attr = nsvg__getAttr(p);
NSVGgradientData* data = NULL;
NSVGgradientData* ref = NULL;
NSVGgradientStop* stops = NULL;
NSVGgradient* grad;
float ox, oy, sw, sh, sl;
int nstops = 0;
int refIter;
data = nsvg__findGradientData(p, id);
if (data == NULL) return NULL;
// TODO: use ref to fill in all unset values too.
ref = data;
refIter = 0;
while (ref != NULL) {
NSVGgradientData* nextRef = NULL;
if (stops == NULL && ref->stops != NULL) {
stops = ref->stops;
nstops = ref->nstops;
break;
}
nextRef = nsvg__findGradientData(p, ref->ref);
if (nextRef == ref) break; // prevent infite loops on malformed data
ref = nextRef;
refIter++;
if (refIter > 32) break; // prevent infite loops on malformed data
}
if (stops == NULL) return NULL;
grad = (NSVGgradient*)malloc(sizeof(NSVGgradient) + sizeof(NSVGgradientStop)*(nstops-1));
if (grad == NULL) return NULL;
// The shape width and height.
if (data->units == NSVG_OBJECT_SPACE) {
ox = localBounds[0];
oy = localBounds[1];
sw = localBounds[2] - localBounds[0];
sh = localBounds[3] - localBounds[1];
} else {
ox = nsvg__actualOrigX(p);
oy = nsvg__actualOrigY(p);
sw = nsvg__actualWidth(p);
sh = nsvg__actualHeight(p);
}
sl = sqrtf(sw*sw + sh*sh) / sqrtf(2.0f);
if (data->type == NSVG_PAINT_LINEAR_GRADIENT) {
float x1, y1, x2, y2, dx, dy;
x1 = nsvg__convertToPixels(p, data->linear.x1, ox, sw);
y1 = nsvg__convertToPixels(p, data->linear.y1, oy, sh);
x2 = nsvg__convertToPixels(p, data->linear.x2, ox, sw);
y2 = nsvg__convertToPixels(p, data->linear.y2, oy, sh);
// Calculate transform aligned to the line
dx = x2 - x1;
dy = y2 - y1;
grad->xform[0] = dy; grad->xform[1] = -dx;
grad->xform[2] = dx; grad->xform[3] = dy;
grad->xform[4] = x1; grad->xform[5] = y1;
} else {
float cx, cy, fx, fy, r;
cx = nsvg__convertToPixels(p, data->radial.cx, ox, sw);
cy = nsvg__convertToPixels(p, data->radial.cy, oy, sh);
fx = nsvg__convertToPixels(p, data->radial.fx, ox, sw);
fy = nsvg__convertToPixels(p, data->radial.fy, oy, sh);
r = nsvg__convertToPixels(p, data->radial.r, 0, sl);
// Calculate transform aligned to the circle
grad->xform[0] = r; grad->xform[1] = 0;
grad->xform[2] = 0; grad->xform[3] = r;
grad->xform[4] = cx; grad->xform[5] = cy;
grad->fx = fx / r;
grad->fy = fy / r;
}
nsvg__xformMultiply(grad->xform, data->xform);
nsvg__xformMultiply(grad->xform, attr->xform);
grad->spread = data->spread;
memcpy(grad->stops, stops, nstops*sizeof(NSVGgradientStop));
grad->nstops = nstops;
*paintType = data->type;
return grad;
}
static float nsvg__getAverageScale(float* t)
{
float sx = sqrtf(t[0]*t[0] + t[2]*t[2]);
float sy = sqrtf(t[1]*t[1] + t[3]*t[3]);
return (sx + sy) * 0.5f;
}
static void nsvg__getLocalBounds(float* bounds, NSVGshape *shape, float* xform)
{
NSVGpath* path;
float curve[4*2], curveBounds[4];
int i, first = 1;
for (path = shape->paths; path != NULL; path = path->next) {
nsvg__xformPoint(&curve[0], &curve[1], path->pts[0], path->pts[1], xform);
for (i = 0; i < path->npts-1; i += 3) {
nsvg__xformPoint(&curve[2], &curve[3], path->pts[(i+1)*2], path->pts[(i+1)*2+1], xform);
nsvg__xformPoint(&curve[4], &curve[5], path->pts[(i+2)*2], path->pts[(i+2)*2+1], xform);
nsvg__xformPoint(&curve[6], &curve[7], path->pts[(i+3)*2], path->pts[(i+3)*2+1], xform);
nsvg__curveBounds(curveBounds, curve);
if (first) {
bounds[0] = curveBounds[0];
bounds[1] = curveBounds[1];
bounds[2] = curveBounds[2];
bounds[3] = curveBounds[3];
first = 0;
} else {
bounds[0] = nsvg__minf(bounds[0], curveBounds[0]);
bounds[1] = nsvg__minf(bounds[1], curveBounds[1]);
bounds[2] = nsvg__maxf(bounds[2], curveBounds[2]);
bounds[3] = nsvg__maxf(bounds[3], curveBounds[3]);
}
curve[0] = curve[6];
curve[1] = curve[7];
}
}
}
static void nsvg__addShape(NSVGparser* p)
{
NSVGattrib* attr = nsvg__getAttr(p);
float scale = 1.0f;
NSVGshape* shape;
NSVGpath* path;
int i;
if (p->plist == NULL)
return;
shape = (NSVGshape*)malloc(sizeof(NSVGshape));
if (shape == NULL) goto error;
memset(shape, 0, sizeof(NSVGshape));
memcpy(shape->id, attr->id, sizeof shape->id);
scale = nsvg__getAverageScale(attr->xform);
shape->strokeWidth = attr->strokeWidth * scale;
shape->strokeDashOffset = attr->strokeDashOffset * scale;
shape->strokeDashCount = (char)attr->strokeDashCount;
for (i = 0; i < attr->strokeDashCount; i++)
shape->strokeDashArray[i] = attr->strokeDashArray[i] * scale;
shape->strokeLineJoin = attr->strokeLineJoin;
shape->strokeLineCap = attr->strokeLineCap;
shape->miterLimit = attr->miterLimit;
shape->fillRule = attr->fillRule;
shape->opacity = attr->opacity;
shape->paths = p->plist;
p->plist = NULL;
// Calculate shape bounds
shape->bounds[0] = shape->paths->bounds[0];
shape->bounds[1] = shape->paths->bounds[1];
shape->bounds[2] = shape->paths->bounds[2];
shape->bounds[3] = shape->paths->bounds[3];
for (path = shape->paths->next; path != NULL; path = path->next) {
shape->bounds[0] = nsvg__minf(shape->bounds[0], path->bounds[0]);
shape->bounds[1] = nsvg__minf(shape->bounds[1], path->bounds[1]);
shape->bounds[2] = nsvg__maxf(shape->bounds[2], path->bounds[2]);
shape->bounds[3] = nsvg__maxf(shape->bounds[3], path->bounds[3]);
}
// Set fill
if (attr->hasFill == 0) {
shape->fill.type = NSVG_PAINT_NONE;
} else if (attr->hasFill == 1) {
shape->fill.type = NSVG_PAINT_COLOR;
shape->fill.color = attr->fillColor;
shape->fill.color |= (unsigned int)(attr->fillOpacity*255) << 24;
} else if (attr->hasFill == 2) {
float inv[6], localBounds[4];
nsvg__xformInverse(inv, attr->xform);
nsvg__getLocalBounds(localBounds, shape, inv);
shape->fill.gradient = nsvg__createGradient(p, attr->fillGradient, localBounds, &shape->fill.type);
if (shape->fill.gradient == NULL) {
shape->fill.type = NSVG_PAINT_NONE;
}
}
// Set stroke
if (attr->hasStroke == 0) {
shape->stroke.type = NSVG_PAINT_NONE;
} else if (attr->hasStroke == 1) {
shape->stroke.type = NSVG_PAINT_COLOR;
shape->stroke.color = attr->strokeColor;
shape->stroke.color |= (unsigned int)(attr->strokeOpacity*255) << 24;
} else if (attr->hasStroke == 2) {
float inv[6], localBounds[4];
nsvg__xformInverse(inv, attr->xform);
nsvg__getLocalBounds(localBounds, shape, inv);
shape->stroke.gradient = nsvg__createGradient(p, attr->strokeGradient, localBounds, &shape->stroke.type);
if (shape->stroke.gradient == NULL)
shape->stroke.type = NSVG_PAINT_NONE;
}
// Set flags
shape->flags = (attr->visible ? NSVG_FLAGS_VISIBLE : 0x00);
// Add to tail
if (p->image->shapes == NULL)
p->image->shapes = shape;
else
p->shapesTail->next = shape;
p->shapesTail = shape;
return;
error:
if (shape) free(shape);
}
static void nsvg__addPath(NSVGparser* p, char closed)
{
NSVGattrib* attr = nsvg__getAttr(p);
NSVGpath* path = NULL;
float bounds[4];
float* curve;
int i;
if (p->npts < 4)
return;
if (closed)
nsvg__lineTo(p, p->pts[0], p->pts[1]);
// Expect 1 + N*3 points (N = number of cubic bezier segments).
if ((p->npts % 3) != 1)
return;
path = (NSVGpath*)malloc(sizeof(NSVGpath));
if (path == NULL) goto error;
memset(path, 0, sizeof(NSVGpath));
path->pts = (float*)malloc(p->npts*2*sizeof(float));
if (path->pts == NULL) goto error;
path->closed = closed;
path->npts = p->npts;
// Transform path.
for (i = 0; i < p->npts; ++i)
nsvg__xformPoint(&path->pts[i*2], &path->pts[i*2+1], p->pts[i*2], p->pts[i*2+1], attr->xform);
// Find bounds
for (i = 0; i < path->npts-1; i += 3) {
curve = &path->pts[i*2];
nsvg__curveBounds(bounds, curve);
if (i == 0) {
path->bounds[0] = bounds[0];
path->bounds[1] = bounds[1];
path->bounds[2] = bounds[2];
path->bounds[3] = bounds[3];
} else {
path->bounds[0] = nsvg__minf(path->bounds[0], bounds[0]);
path->bounds[1] = nsvg__minf(path->bounds[1], bounds[1]);
path->bounds[2] = nsvg__maxf(path->bounds[2], bounds[2]);
path->bounds[3] = nsvg__maxf(path->bounds[3], bounds[3]);
}
}
path->next = p->plist;
p->plist = path;
return;
error:
if (path != NULL) {
if (path->pts != NULL) free(path->pts);
free(path);
}
}
// We roll our own string to float because the std library one uses locale and messes things up.
static double nsvg__atof(const char* s)
{
char* cur = (char*)s;
char* end = NULL;
double res = 0.0, sign = 1.0;
long long intPart = 0, fracPart = 0;
char hasIntPart = 0, hasFracPart = 0;
// Parse optional sign
if (*cur == '+') {
cur++;
} else if (*cur == '-') {
sign = -1;
cur++;
}
// Parse integer part
if (nsvg__isdigit(*cur)) {
// Parse digit sequence
intPart = strtoll(cur, &end, 10);
if (cur != end) {
res = (double)intPart;
hasIntPart = 1;
cur = end;
}
}
// Parse fractional part.
if (*cur == '.') {
cur++; // Skip '.'
if (nsvg__isdigit(*cur)) {
// Parse digit sequence
fracPart = strtoll(cur, &end, 10);
if (cur != end) {
res += (double)fracPart / pow(10.0, (double)(end - cur));
hasFracPart = 1;
cur = end;
}
}
}
// A valid number should have integer or fractional part.
if (!hasIntPart && !hasFracPart)
return 0.0;
// Parse optional exponent
if (*cur == 'e' || *cur == 'E') {
long expPart = 0;
cur++; // skip 'E'
expPart = strtol(cur, &end, 10); // Parse digit sequence with sign
if (cur != end) {
res *= pow(10.0, (double)expPart);
}
}
return res * sign;
}
static const char* nsvg__parseNumber(const char* s, char* it, const int size)
{
const int last = size-1;
int i = 0;
// sign
if (*s == '-' || *s == '+') {
if (i < last) it[i++] = *s;
s++;
}
// integer part
while (*s && nsvg__isdigit(*s)) {
if (i < last) it[i++] = *s;
s++;
}
if (*s == '.') {
// decimal point
if (i < last) it[i++] = *s;
s++;
// fraction part
while (*s && nsvg__isdigit(*s)) {
if (i < last) it[i++] = *s;
s++;
}
}
// exponent
if ((*s == 'e' || *s == 'E') && (s[1] != 'm' && s[1] != 'x')) {
if (i < last) it[i++] = *s;
s++;
if (*s == '-' || *s == '+') {
if (i < last) it[i++] = *s;
s++;
}
while (*s && nsvg__isdigit(*s)) {
if (i < last) it[i++] = *s;
s++;
}
}
it[i] = '\0';
return s;
}
static const char* nsvg__getNextPathItem(const char* s, char* it)
{
it[0] = '\0';
// Skip white spaces and commas
while (*s && (nsvg__isspace(*s) || *s == ',')) s++;
if (!*s) return s;
if (*s == '-' || *s == '+' || *s == '.' || nsvg__isdigit(*s)) {
s = nsvg__parseNumber(s, it, 64);
} else {
// Parse command
it[0] = *s++;
it[1] = '\0';
return s;
}
return s;
}
static unsigned int nsvg__parseColorHex(const char* str)
{
unsigned int c = 0, r = 0, g = 0, b = 0;
int n = 0;
str++; // skip #
// Calculate number of characters.
while(str[n] && !nsvg__isspace(str[n]))
n++;
if (n == 6) {
sscanf(str, "%x", &c);
} else if (n == 3) {
sscanf(str, "%x", &c);
c = (c&0xf) | ((c&0xf0) << 4) | ((c&0xf00) << 8);
c |= c<<4;
}
r = (c >> 16) & 0xff;
g = (c >> 8) & 0xff;
b = c & 0xff;
return NSVG_RGB(r,g,b);
}
static unsigned int nsvg__parseColorRGB(const char* str)
{
int r = -1, g = -1, b = -1;
char s1[32]="", s2[32]="";
sscanf(str + 4, "%d%[%%, \t]%d%[%%, \t]%d", &r, s1, &g, s2, &b);
if (strchr(s1, '%')) {
return NSVG_RGB((r*255)/100,(g*255)/100,(b*255)/100);
} else {
return NSVG_RGB(r,g,b);
}
}
typedef struct NSVGNamedColor {
const char* name;
unsigned int color;
} NSVGNamedColor;
NSVGNamedColor nsvg__colors[] = {
{ "red", NSVG_RGB(255, 0, 0) },
{ "green", NSVG_RGB( 0, 128, 0) },
{ "blue", NSVG_RGB( 0, 0, 255) },
{ "yellow", NSVG_RGB(255, 255, 0) },
{ "cyan", NSVG_RGB( 0, 255, 255) },
{ "magenta", NSVG_RGB(255, 0, 255) },
{ "black", NSVG_RGB( 0, 0, 0) },
{ "grey", NSVG_RGB(128, 128, 128) },
{ "gray", NSVG_RGB(128, 128, 128) },
{ "white", NSVG_RGB(255, 255, 255) },
#ifdef NANOSVG_ALL_COLOR_KEYWORDS
{ "aliceblue", NSVG_RGB(240, 248, 255) },
{ "antiquewhite", NSVG_RGB(250, 235, 215) },
{ "aqua", NSVG_RGB( 0, 255, 255) },
{ "aquamarine", NSVG_RGB(127, 255, 212) },
{ "azure", NSVG_RGB(240, 255, 255) },
{ "beige", NSVG_RGB(245, 245, 220) },
{ "bisque", NSVG_RGB(255, 228, 196) },
{ "blanchedalmond", NSVG_RGB(255, 235, 205) },
{ "blueviolet", NSVG_RGB(138, 43, 226) },
{ "brown", NSVG_RGB(165, 42, 42) },
{ "burlywood", NSVG_RGB(222, 184, 135) },
{ "cadetblue", NSVG_RGB( 95, 158, 160) },
{ "chartreuse", NSVG_RGB(127, 255, 0) },
{ "chocolate", NSVG_RGB(210, 105, 30) },
{ "coral", NSVG_RGB(255, 127, 80) },
{ "cornflowerblue", NSVG_RGB(100, 149, 237) },
{ "cornsilk", NSVG_RGB(255, 248, 220) },
{ "crimson", NSVG_RGB(220, 20, 60) },
{ "darkblue", NSVG_RGB( 0, 0, 139) },
{ "darkcyan", NSVG_RGB( 0, 139, 139) },
{ "darkgoldenrod", NSVG_RGB(184, 134, 11) },
{ "darkgray", NSVG_RGB(169, 169, 169) },
{ "darkgreen", NSVG_RGB( 0, 100, 0) },
{ "darkgrey", NSVG_RGB(169, 169, 169) },
{ "darkkhaki", NSVG_RGB(189, 183, 107) },
{ "darkmagenta", NSVG_RGB(139, 0, 139) },
{ "darkolivegreen", NSVG_RGB( 85, 107, 47) },
{ "darkorange", NSVG_RGB(255, 140, 0) },
{ "darkorchid", NSVG_RGB(153, 50, 204) },
{ "darkred", NSVG_RGB(139, 0, 0) },
{ "darksalmon", NSVG_RGB(233, 150, 122) },
{ "darkseagreen", NSVG_RGB(143, 188, 143) },
{ "darkslateblue", NSVG_RGB( 72, 61, 139) },
{ "darkslategray", NSVG_RGB( 47, 79, 79) },
{ "darkslategrey", NSVG_RGB( 47, 79, 79) },
{ "darkturquoise", NSVG_RGB( 0, 206, 209) },
{ "darkviolet", NSVG_RGB(148, 0, 211) },
{ "deeppink", NSVG_RGB(255, 20, 147) },
{ "deepskyblue", NSVG_RGB( 0, 191, 255) },
{ "dimgray", NSVG_RGB(105, 105, 105) },
{ "dimgrey", NSVG_RGB(105, 105, 105) },
{ "dodgerblue", NSVG_RGB( 30, 144, 255) },
{ "firebrick", NSVG_RGB(178, 34, 34) },
{ "floralwhite", NSVG_RGB(255, 250, 240) },
{ "forestgreen", NSVG_RGB( 34, 139, 34) },
{ "fuchsia", NSVG_RGB(255, 0, 255) },
{ "gainsboro", NSVG_RGB(220, 220, 220) },
{ "ghostwhite", NSVG_RGB(248, 248, 255) },
{ "gold", NSVG_RGB(255, 215, 0) },
{ "goldenrod", NSVG_RGB(218, 165, 32) },
{ "greenyellow", NSVG_RGB(173, 255, 47) },
{ "honeydew", NSVG_RGB(240, 255, 240) },
{ "hotpink", NSVG_RGB(255, 105, 180) },
{ "indianred", NSVG_RGB(205, 92, 92) },
{ "indigo", NSVG_RGB( 75, 0, 130) },
{ "ivory", NSVG_RGB(255, 255, 240) },
{ "khaki", NSVG_RGB(240, 230, 140) },
{ "lavender", NSVG_RGB(230, 230, 250) },
{ "lavenderblush", NSVG_RGB(255, 240, 245) },
{ "lawngreen", NSVG_RGB(124, 252, 0) },
{ "lemonchiffon", NSVG_RGB(255, 250, 205) },
{ "lightblue", NSVG_RGB(173, 216, 230) },
{ "lightcoral", NSVG_RGB(240, 128, 128) },
{ "lightcyan", NSVG_RGB(224, 255, 255) },
{ "lightgoldenrodyellow", NSVG_RGB(250, 250, 210) },
{ "lightgray", NSVG_RGB(211, 211, 211) },
{ "lightgreen", NSVG_RGB(144, 238, 144) },
{ "lightgrey", NSVG_RGB(211, 211, 211) },
{ "lightpink", NSVG_RGB(255, 182, 193) },
{ "lightsalmon", NSVG_RGB(255, 160, 122) },
{ "lightseagreen", NSVG_RGB( 32, 178, 170) },
{ "lightskyblue", NSVG_RGB(135, 206, 250) },
{ "lightslategray", NSVG_RGB(119, 136, 153) },
{ "lightslategrey", NSVG_RGB(119, 136, 153) },
{ "lightsteelblue", NSVG_RGB(176, 196, 222) },
{ "lightyellow", NSVG_RGB(255, 255, 224) },
{ "lime", NSVG_RGB( 0, 255, 0) },
{ "limegreen", NSVG_RGB( 50, 205, 50) },
{ "linen", NSVG_RGB(250, 240, 230) },
{ "maroon", NSVG_RGB(128, 0, 0) },
{ "mediumaquamarine", NSVG_RGB(102, 205, 170) },
{ "mediumblue", NSVG_RGB( 0, 0, 205) },
{ "mediumorchid", NSVG_RGB(186, 85, 211) },
{ "mediumpurple", NSVG_RGB(147, 112, 219) },
{ "mediumseagreen", NSVG_RGB( 60, 179, 113) },
{ "mediumslateblue", NSVG_RGB(123, 104, 238) },
{ "mediumspringgreen", NSVG_RGB( 0, 250, 154) },
{ "mediumturquoise", NSVG_RGB( 72, 209, 204) },
{ "mediumvioletred", NSVG_RGB(199, 21, 133) },
{ "midnightblue", NSVG_RGB( 25, 25, 112) },
{ "mintcream", NSVG_RGB(245, 255, 250) },
{ "mistyrose", NSVG_RGB(255, 228, 225) },
{ "moccasin", NSVG_RGB(255, 228, 181) },
{ "navajowhite", NSVG_RGB(255, 222, 173) },
{ "navy", NSVG_RGB( 0, 0, 128) },
{ "oldlace", NSVG_RGB(253, 245, 230) },
{ "olive", NSVG_RGB(128, 128, 0) },
{ "olivedrab", NSVG_RGB(107, 142, 35) },
{ "orange", NSVG_RGB(255, 165, 0) },
{ "orangered", NSVG_RGB(255, 69, 0) },
{ "orchid", NSVG_RGB(218, 112, 214) },
{ "palegoldenrod", NSVG_RGB(238, 232, 170) },
{ "palegreen", NSVG_RGB(152, 251, 152) },
{ "paleturquoise", NSVG_RGB(175, 238, 238) },
{ "palevioletred", NSVG_RGB(219, 112, 147) },
{ "papayawhip", NSVG_RGB(255, 239, 213) },
{ "peachpuff", NSVG_RGB(255, 218, 185) },
{ "peru", NSVG_RGB(205, 133, 63) },
{ "pink", NSVG_RGB(255, 192, 203) },
{ "plum", NSVG_RGB(221, 160, 221) },
{ "powderblue", NSVG_RGB(176, 224, 230) },
{ "purple", NSVG_RGB(128, 0, 128) },
{ "rosybrown", NSVG_RGB(188, 143, 143) },
{ "royalblue", NSVG_RGB( 65, 105, 225) },
{ "saddlebrown", NSVG_RGB(139, 69, 19) },
{ "salmon", NSVG_RGB(250, 128, 114) },
{ "sandybrown", NSVG_RGB(244, 164, 96) },
{ "seagreen", NSVG_RGB( 46, 139, 87) },
{ "seashell", NSVG_RGB(255, 245, 238) },
{ "sienna", NSVG_RGB(160, 82, 45) },
{ "silver", NSVG_RGB(192, 192, 192) },
{ "skyblue", NSVG_RGB(135, 206, 235) },
{ "slateblue", NSVG_RGB(106, 90, 205) },
{ "slategray", NSVG_RGB(112, 128, 144) },
{ "slategrey", NSVG_RGB(112, 128, 144) },
{ "snow", NSVG_RGB(255, 250, 250) },
{ "springgreen", NSVG_RGB( 0, 255, 127) },
{ "steelblue", NSVG_RGB( 70, 130, 180) },
{ "tan", NSVG_RGB(210, 180, 140) },
{ "teal", NSVG_RGB( 0, 128, 128) },
{ "thistle", NSVG_RGB(216, 191, 216) },
{ "tomato", NSVG_RGB(255, 99, 71) },
{ "turquoise", NSVG_RGB( 64, 224, 208) },
{ "violet", NSVG_RGB(238, 130, 238) },
{ "wheat", NSVG_RGB(245, 222, 179) },
{ "whitesmoke", NSVG_RGB(245, 245, 245) },
{ "yellowgreen", NSVG_RGB(154, 205, 50) },
#endif
};
static unsigned int nsvg__parseColorName(const char* str)
{
int i, ncolors = sizeof(nsvg__colors) / sizeof(NSVGNamedColor);
for (i = 0; i < ncolors; i++) {
if (strcmp(nsvg__colors[i].name, str) == 0) {
return nsvg__colors[i].color;
}
}
return NSVG_RGB(128, 128, 128);
}
static unsigned int nsvg__parseColor(const char* str)
{
size_t len = 0;
while(*str == ' ') ++str;
len = strlen(str);
if (len >= 1 && *str == '#')
return nsvg__parseColorHex(str);
else if (len >= 4 && str[0] == 'r' && str[1] == 'g' && str[2] == 'b' && str[3] == '(')
return nsvg__parseColorRGB(str);
return nsvg__parseColorName(str);
}
static float nsvg__parseOpacity(const char* str)
{
float val = nsvg__atof(str);
if (val < 0.0f) val = 0.0f;
if (val > 1.0f) val = 1.0f;
return val;
}
static float nsvg__parseMiterLimit(const char* str)
{
float val = nsvg__atof(str);
if (val < 0.0f) val = 0.0f;
return val;
}
static int nsvg__parseUnits(const char* units)
{
if (units[0] == 'p' && units[1] == 'x')
return NSVG_UNITS_PX;
else if (units[0] == 'p' && units[1] == 't')
return NSVG_UNITS_PT;
else if (units[0] == 'p' && units[1] == 'c')
return NSVG_UNITS_PC;
else if (units[0] == 'm' && units[1] == 'm')
return NSVG_UNITS_MM;
else if (units[0] == 'c' && units[1] == 'm')
return NSVG_UNITS_CM;
else if (units[0] == 'i' && units[1] == 'n')
return NSVG_UNITS_IN;
else if (units[0] == '%')
return NSVG_UNITS_PERCENT;
else if (units[0] == 'e' && units[1] == 'm')
return NSVG_UNITS_EM;
else if (units[0] == 'e' && units[1] == 'x')
return NSVG_UNITS_EX;
return NSVG_UNITS_USER;
}
static int nsvg__isCoordinate(const char* s)
{
// optional sign
if (*s == '-' || *s == '+')
s++;
// must have at least one digit, or start by a dot
return (nsvg__isdigit(*s) || *s == '.');
}
static NSVGcoordinate nsvg__parseCoordinateRaw(const char* str)
{
NSVGcoordinate coord = {0, NSVG_UNITS_USER};
char buf[64];
coord.units = nsvg__parseUnits(nsvg__parseNumber(str, buf, 64));
coord.value = nsvg__atof(buf);
return coord;
}
static NSVGcoordinate nsvg__coord(float v, int units)
{
NSVGcoordinate coord = {v, units};
return coord;
}
static float nsvg__parseCoordinate(NSVGparser* p, const char* str, float orig, float length)
{
NSVGcoordinate coord = nsvg__parseCoordinateRaw(str);
return nsvg__convertToPixels(p, coord, orig, length);
}
static int nsvg__parseTransformArgs(const char* str, float* args, int maxNa, int* na)
{
const char* end;
const char* ptr;
char it[64];
*na = 0;
ptr = str;
while (*ptr && *ptr != '(') ++ptr;
if (*ptr == 0)
return 1;
end = ptr;
while (*end && *end != ')') ++end;
if (*end == 0)
return 1;
while (ptr < end) {
if (*ptr == '-' || *ptr == '+' || *ptr == '.' || nsvg__isdigit(*ptr)) {
if (*na >= maxNa) return 0;
ptr = nsvg__parseNumber(ptr, it, 64);
args[(*na)++] = (float)nsvg__atof(it);
} else {
++ptr;
}
}
return (int)(end - str);
}
static int nsvg__parseMatrix(float* xform, const char* str)
{
float t[6];
int na = 0;
int len = nsvg__parseTransformArgs(str, t, 6, &na);
if (na != 6) return len;
memcpy(xform, t, sizeof(float)*6);
return len;
}
static int nsvg__parseTranslate(float* xform, const char* str)
{
float args[2];
float t[6];
int na = 0;
int len = nsvg__parseTransformArgs(str, args, 2, &na);
if (na == 1) args[1] = 0.0;
nsvg__xformSetTranslation(t, args[0], args[1]);
memcpy(xform, t, sizeof(float)*6);
return len;
}
static int nsvg__parseScale(float* xform, const char* str)
{
float args[2];
int na = 0;
float t[6];
int len = nsvg__parseTransformArgs(str, args, 2, &na);
if (na == 1) args[1] = args[0];
nsvg__xformSetScale(t, args[0], args[1]);
memcpy(xform, t, sizeof(float)*6);
return len;
}
static int nsvg__parseSkewX(float* xform, const char* str)
{
float args[1];
int na = 0;
float t[6];
int len = nsvg__parseTransformArgs(str, args, 1, &na);
nsvg__xformSetSkewX(t, args[0]/180.0f*NSVG_PI);
memcpy(xform, t, sizeof(float)*6);
return len;
}
static int nsvg__parseSkewY(float* xform, const char* str)
{
float args[1];
int na = 0;
float t[6];
int len = nsvg__parseTransformArgs(str, args, 1, &na);
nsvg__xformSetSkewY(t, args[0]/180.0f*NSVG_PI);
memcpy(xform, t, sizeof(float)*6);
return len;
}
static int nsvg__parseRotate(float* xform, const char* str)
{
float args[3];
int na = 0;
float m[6];
float t[6];
int len = nsvg__parseTransformArgs(str, args, 3, &na);
if (na == 1)
args[1] = args[2] = 0.0f;
nsvg__xformIdentity(m);
if (na > 1) {
nsvg__xformSetTranslation(t, -args[1], -args[2]);
nsvg__xformMultiply(m, t);
}
nsvg__xformSetRotation(t, args[0]/180.0f*NSVG_PI);
nsvg__xformMultiply(m, t);
if (na > 1) {
nsvg__xformSetTranslation(t, args[1], args[2]);
nsvg__xformMultiply(m, t);
}
memcpy(xform, m, sizeof(float)*6);
return len;
}
static void nsvg__parseTransform(float* xform, const char* str)
{
float t[6];
int len;
nsvg__xformIdentity(xform);
while (*str)
{
if (strncmp(str, "matrix", 6) == 0)
len = nsvg__parseMatrix(t, str);
else if (strncmp(str, "translate", 9) == 0)
len = nsvg__parseTranslate(t, str);
else if (strncmp(str, "scale", 5) == 0)
len = nsvg__parseScale(t, str);
else if (strncmp(str, "rotate", 6) == 0)
len = nsvg__parseRotate(t, str);
else if (strncmp(str, "skewX", 5) == 0)
len = nsvg__parseSkewX(t, str);
else if (strncmp(str, "skewY", 5) == 0)
len = nsvg__parseSkewY(t, str);
else{
++str;
continue;
}
if (len != 0) {
str += len;
} else {
++str;
continue;
}
nsvg__xformPremultiply(xform, t);
}
}
static void nsvg__parseUrl(char* id, const char* str)
{
int i = 0;
str += 4; // "url(";
if (*str == '#')
str++;
while (i < 63 && *str != ')') {
id[i] = *str++;
i++;
}
id[i] = '\0';
}
static char nsvg__parseLineCap(const char* str)
{
if (strcmp(str, "butt") == 0)
return NSVG_CAP_BUTT;
else if (strcmp(str, "round") == 0)
return NSVG_CAP_ROUND;
else if (strcmp(str, "square") == 0)
return NSVG_CAP_SQUARE;
// TODO: handle inherit.
return NSVG_CAP_BUTT;
}
static char nsvg__parseLineJoin(const char* str)
{
if (strcmp(str, "miter") == 0)
return NSVG_JOIN_MITER;
else if (strcmp(str, "round") == 0)
return NSVG_JOIN_ROUND;
else if (strcmp(str, "bevel") == 0)
return NSVG_JOIN_BEVEL;
// TODO: handle inherit.
return NSVG_JOIN_MITER;
}
static char nsvg__parseFillRule(const char* str)
{
if (strcmp(str, "nonzero") == 0)
return NSVG_FILLRULE_NONZERO;
else if (strcmp(str, "evenodd") == 0)
return NSVG_FILLRULE_EVENODD;
// TODO: handle inherit.
return NSVG_FILLRULE_NONZERO;
}
static const char* nsvg__getNextDashItem(const char* s, char* it)
{
int n = 0;
it[0] = '\0';
// Skip white spaces and commas
while (*s && (nsvg__isspace(*s) || *s == ',')) s++;
// Advance until whitespace, comma or end.
while (*s && (!nsvg__isspace(*s) && *s != ',')) {
if (n < 63)
it[n++] = *s;
s++;
}
it[n++] = '\0';
return s;
}
static int nsvg__parseStrokeDashArray(NSVGparser* p, const char* str, float* strokeDashArray)
{
char item[64];
int count = 0, i;
float sum = 0.0f;
// Handle "none"
if (str[0] == 'n')
return 0;
// Parse dashes
while (*str) {
str = nsvg__getNextDashItem(str, item);
if (!*item) break;
if (count < NSVG_MAX_DASHES)
strokeDashArray[count++] = fabsf(nsvg__parseCoordinate(p, item, 0.0f, nsvg__actualLength(p)));
}
for (i = 0; i < count; i++)
sum += strokeDashArray[i];
if (sum <= 1e-6f)
count = 0;
return count;
}
static void nsvg__parseStyle(NSVGparser* p, const char* str);
static int nsvg__parseAttr(NSVGparser* p, const char* name, const char* value)
{
float xform[6];
NSVGattrib* attr = nsvg__getAttr(p);
if (!attr) return 0;
if (strcmp(name, "style") == 0) {
nsvg__parseStyle(p, value);
} else if (strcmp(name, "display") == 0) {
if (strcmp(value, "none") == 0)
attr->visible = 0;
// Don't reset ->visible on display:inline, one display:none hides the whole subtree
} else if (strcmp(name, "fill") == 0) {
if (strcmp(value, "none") == 0) {
attr->hasFill = 0;
} else if (strncmp(value, "url(", 4) == 0) {
attr->hasFill = 2;
nsvg__parseUrl(attr->fillGradient, value);
} else {
attr->hasFill = 1;
attr->fillColor = nsvg__parseColor(value);
}
} else if (strcmp(name, "opacity") == 0) {
attr->opacity = nsvg__parseOpacity(value);
} else if (strcmp(name, "fill-opacity") == 0) {
attr->fillOpacity = nsvg__parseOpacity(value);
} else if (strcmp(name, "stroke") == 0) {
if (strcmp(value, "none") == 0) {
attr->hasStroke = 0;
} else if (strncmp(value, "url(", 4) == 0) {
attr->hasStroke = 2;
nsvg__parseUrl(attr->strokeGradient, value);
} else {
attr->hasStroke = 1;
attr->strokeColor = nsvg__parseColor(value);
}
} else if (strcmp(name, "stroke-width") == 0) {
attr->strokeWidth = nsvg__parseCoordinate(p, value, 0.0f, nsvg__actualLength(p));
} else if (strcmp(name, "stroke-dasharray") == 0) {
attr->strokeDashCount = nsvg__parseStrokeDashArray(p, value, attr->strokeDashArray);
} else if (strcmp(name, "stroke-dashoffset") == 0) {
attr->strokeDashOffset = nsvg__parseCoordinate(p, value, 0.0f, nsvg__actualLength(p));
} else if (strcmp(name, "stroke-opacity") == 0) {
attr->strokeOpacity = nsvg__parseOpacity(value);
} else if (strcmp(name, "stroke-linecap") == 0) {
attr->strokeLineCap = nsvg__parseLineCap(value);
} else if (strcmp(name, "stroke-linejoin") == 0) {
attr->strokeLineJoin = nsvg__parseLineJoin(value);
} else if (strcmp(name, "stroke-miterlimit") == 0) {
attr->miterLimit = nsvg__parseMiterLimit(value);
} else if (strcmp(name, "fill-rule") == 0) {
attr->fillRule = nsvg__parseFillRule(value);
} else if (strcmp(name, "font-size") == 0) {
attr->fontSize = nsvg__parseCoordinate(p, value, 0.0f, nsvg__actualLength(p));
} else if (strcmp(name, "transform") == 0) {
nsvg__parseTransform(xform, value);
nsvg__xformPremultiply(attr->xform, xform);
} else if (strcmp(name, "stop-color") == 0) {
attr->stopColor = nsvg__parseColor(value);
} else if (strcmp(name, "stop-opacity") == 0) {
attr->stopOpacity = nsvg__parseOpacity(value);
} else if (strcmp(name, "offset") == 0) {
attr->stopOffset = nsvg__parseCoordinate(p, value, 0.0f, 1.0f);
} else if (strcmp(name, "id") == 0) {
strncpy(attr->id, value, 63);
attr->id[63] = '\0';
} else {
return 0;
}
return 1;
}
static int nsvg__parseNameValue(NSVGparser* p, const char* start, const char* end)
{
const char* str;
const char* val;
char name[512];
char value[512];
int n;
str = start;
while (str < end && *str != ':') ++str;
val = str;
// Right Trim
while (str > start && (*str == ':' || nsvg__isspace(*str))) --str;
++str;
n = (int)(str - start);
if (n > 511) n = 511;
if (n) memcpy(name, start, n);
name[n] = 0;
while (val < end && (*val == ':' || nsvg__isspace(*val))) ++val;
n = (int)(end - val);
if (n > 511) n = 511;
if (n) memcpy(value, val, n);
value[n] = 0;
return nsvg__parseAttr(p, name, value);
}
static void nsvg__parseStyle(NSVGparser* p, const char* str)
{
const char* start;
const char* end;
while (*str) {
// Left Trim
while(*str && nsvg__isspace(*str)) ++str;
start = str;
while(*str && *str != ';') ++str;
end = str;
// Right Trim
while (end > start && (*end == ';' || nsvg__isspace(*end))) --end;
++end;
nsvg__parseNameValue(p, start, end);
if (*str) ++str;
}
}
static void nsvg__parseAttribs(NSVGparser* p, const char** attr)
{
int i;
for (i = 0; attr[i]; i += 2)
{
if (strcmp(attr[i], "style") == 0)
nsvg__parseStyle(p, attr[i + 1]);
else
nsvg__parseAttr(p, attr[i], attr[i + 1]);
}
}
static int nsvg__getArgsPerElement(char cmd)
{
switch (cmd) {
case 'v':
case 'V':
case 'h':
case 'H':
return 1;
case 'm':
case 'M':
case 'l':
case 'L':
case 't':
case 'T':
return 2;
case 'q':
case 'Q':
case 's':
case 'S':
return 4;
case 'c':
case 'C':
return 6;
case 'a':
case 'A':
return 7;
case 'z':
case 'Z':
return 0;
}
return -1;
}
static void nsvg__pathMoveTo(NSVGparser* p, float* cpx, float* cpy, float* args, int rel)
{
if (rel) {
*cpx += args[0];
*cpy += args[1];
} else {
*cpx = args[0];
*cpy = args[1];
}
nsvg__moveTo(p, *cpx, *cpy);
}
static void nsvg__pathLineTo(NSVGparser* p, float* cpx, float* cpy, float* args, int rel)
{
if (rel) {
*cpx += args[0];
*cpy += args[1];
} else {
*cpx = args[0];
*cpy = args[1];
}
nsvg__lineTo(p, *cpx, *cpy);
}
static void nsvg__pathHLineTo(NSVGparser* p, float* cpx, float* cpy, float* args, int rel)
{
if (rel)
*cpx += args[0];
else
*cpx = args[0];
nsvg__lineTo(p, *cpx, *cpy);
}
static void nsvg__pathVLineTo(NSVGparser* p, float* cpx, float* cpy, float* args, int rel)
{
if (rel)
*cpy += args[0];
else
*cpy = args[0];
nsvg__lineTo(p, *cpx, *cpy);
}
static void nsvg__pathCubicBezTo(NSVGparser* p, float* cpx, float* cpy,
float* cpx2, float* cpy2, float* args, int rel)
{
float x2, y2, cx1, cy1, cx2, cy2;
if (rel) {
cx1 = *cpx + args[0];
cy1 = *cpy + args[1];
cx2 = *cpx + args[2];
cy2 = *cpy + args[3];
x2 = *cpx + args[4];
y2 = *cpy + args[5];
} else {
cx1 = args[0];
cy1 = args[1];
cx2 = args[2];
cy2 = args[3];
x2 = args[4];
y2 = args[5];
}
nsvg__cubicBezTo(p, cx1,cy1, cx2,cy2, x2,y2);
*cpx2 = cx2;
*cpy2 = cy2;
*cpx = x2;
*cpy = y2;
}
static void nsvg__pathCubicBezShortTo(NSVGparser* p, float* cpx, float* cpy,
float* cpx2, float* cpy2, float* args, int rel)
{
float x1, y1, x2, y2, cx1, cy1, cx2, cy2;
x1 = *cpx;
y1 = *cpy;
if (rel) {
cx2 = *cpx + args[0];
cy2 = *cpy + args[1];
x2 = *cpx + args[2];
y2 = *cpy + args[3];
} else {
cx2 = args[0];
cy2 = args[1];
x2 = args[2];
y2 = args[3];
}
cx1 = 2*x1 - *cpx2;
cy1 = 2*y1 - *cpy2;
nsvg__cubicBezTo(p, cx1,cy1, cx2,cy2, x2,y2);
*cpx2 = cx2;
*cpy2 = cy2;
*cpx = x2;
*cpy = y2;
}
static void nsvg__pathQuadBezTo(NSVGparser* p, float* cpx, float* cpy,
float* cpx2, float* cpy2, float* args, int rel)
{
float x1, y1, x2, y2, cx, cy;
float cx1, cy1, cx2, cy2;
x1 = *cpx;
y1 = *cpy;
if (rel) {
cx = *cpx + args[0];
cy = *cpy + args[1];
x2 = *cpx + args[2];
y2 = *cpy + args[3];
} else {
cx = args[0];
cy = args[1];
x2 = args[2];
y2 = args[3];
}
// Convert to cubic bezier
cx1 = x1 + 2.0f/3.0f*(cx - x1);
cy1 = y1 + 2.0f/3.0f*(cy - y1);
cx2 = x2 + 2.0f/3.0f*(cx - x2);
cy2 = y2 + 2.0f/3.0f*(cy - y2);
nsvg__cubicBezTo(p, cx1,cy1, cx2,cy2, x2,y2);
*cpx2 = cx;
*cpy2 = cy;
*cpx = x2;
*cpy = y2;
}
static void nsvg__pathQuadBezShortTo(NSVGparser* p, float* cpx, float* cpy,
float* cpx2, float* cpy2, float* args, int rel)
{
float x1, y1, x2, y2, cx, cy;
float cx1, cy1, cx2, cy2;
x1 = *cpx;
y1 = *cpy;
if (rel) {
x2 = *cpx + args[0];
y2 = *cpy + args[1];
} else {
x2 = args[0];
y2 = args[1];
}
cx = 2*x1 - *cpx2;
cy = 2*y1 - *cpy2;
// Convert to cubix bezier
cx1 = x1 + 2.0f/3.0f*(cx - x1);
cy1 = y1 + 2.0f/3.0f*(cy - y1);
cx2 = x2 + 2.0f/3.0f*(cx - x2);
cy2 = y2 + 2.0f/3.0f*(cy - y2);
nsvg__cubicBezTo(p, cx1,cy1, cx2,cy2, x2,y2);
*cpx2 = cx;
*cpy2 = cy;
*cpx = x2;
*cpy = y2;
}
static float nsvg__sqr(float x) { return x*x; }
static float nsvg__vmag(float x, float y) { return sqrtf(x*x + y*y); }
static float nsvg__vecrat(float ux, float uy, float vx, float vy)
{
return (ux*vx + uy*vy) / (nsvg__vmag(ux,uy) * nsvg__vmag(vx,vy));
}
static float nsvg__vecang(float ux, float uy, float vx, float vy)
{
float r = nsvg__vecrat(ux,uy, vx,vy);
if (r < -1.0f) r = -1.0f;
if (r > 1.0f) r = 1.0f;
return ((ux*vy < uy*vx) ? -1.0f : 1.0f) * acosf(r);
}
static void nsvg__pathArcTo(NSVGparser* p, float* cpx, float* cpy, float* args, int rel)
{
// Ported from canvg (https://code.google.com/p/canvg/)
float rx, ry, rotx;
float x1, y1, x2, y2, cx, cy, dx, dy, d;
float x1p, y1p, cxp, cyp, s, sa, sb;
float ux, uy, vx, vy, a1, da;
float x, y, tanx, tany, a, px = 0, py = 0, ptanx = 0, ptany = 0, t[6];
float sinrx, cosrx;
int fa, fs;
int i, ndivs;
float hda, kappa;
rx = fabsf(args[0]); // y radius
ry = fabsf(args[1]); // x radius
rotx = args[2] / 180.0f * NSVG_PI; // x rotation angle
fa = fabsf(args[3]) > 1e-6 ? 1 : 0; // Large arc
fs = fabsf(args[4]) > 1e-6 ? 1 : 0; // Sweep direction
x1 = *cpx; // start point
y1 = *cpy;
if (rel) { // end point
x2 = *cpx + args[5];
y2 = *cpy + args[6];
} else {
x2 = args[5];
y2 = args[6];
}
dx = x1 - x2;
dy = y1 - y2;
d = sqrtf(dx*dx + dy*dy);
if (d < 1e-6f || rx < 1e-6f || ry < 1e-6f) {
// The arc degenerates to a line
nsvg__lineTo(p, x2, y2);
*cpx = x2;
*cpy = y2;
return;
}
sinrx = sinf(rotx);
cosrx = cosf(rotx);
// Convert to center point parameterization.
// http://www.w3.org/TR/SVG11/implnote.html#ArcImplementationNotes
// 1) Compute x1', y1'
x1p = cosrx * dx / 2.0f + sinrx * dy / 2.0f;
y1p = -sinrx * dx / 2.0f + cosrx * dy / 2.0f;
d = nsvg__sqr(x1p)/nsvg__sqr(rx) + nsvg__sqr(y1p)/nsvg__sqr(ry);
if (d > 1) {
d = sqrtf(d);
rx *= d;
ry *= d;
}
// 2) Compute cx', cy'
s = 0.0f;
sa = nsvg__sqr(rx)*nsvg__sqr(ry) - nsvg__sqr(rx)*nsvg__sqr(y1p) - nsvg__sqr(ry)*nsvg__sqr(x1p);
sb = nsvg__sqr(rx)*nsvg__sqr(y1p) + nsvg__sqr(ry)*nsvg__sqr(x1p);
if (sa < 0.0f) sa = 0.0f;
if (sb > 0.0f)
s = sqrtf(sa / sb);
if (fa == fs)
s = -s;
cxp = s * rx * y1p / ry;
cyp = s * -ry * x1p / rx;
// 3) Compute cx,cy from cx',cy'
cx = (x1 + x2)/2.0f + cosrx*cxp - sinrx*cyp;
cy = (y1 + y2)/2.0f + sinrx*cxp + cosrx*cyp;
// 4) Calculate theta1, and delta theta.
ux = (x1p - cxp) / rx;
uy = (y1p - cyp) / ry;
vx = (-x1p - cxp) / rx;
vy = (-y1p - cyp) / ry;
a1 = nsvg__vecang(1.0f,0.0f, ux,uy); // Initial angle
da = nsvg__vecang(ux,uy, vx,vy); // Delta angle
// if (vecrat(ux,uy,vx,vy) <= -1.0f) da = NSVG_PI;
// if (vecrat(ux,uy,vx,vy) >= 1.0f) da = 0;
if (fs == 0 && da > 0)
da -= 2 * NSVG_PI;
else if (fs == 1 && da < 0)
da += 2 * NSVG_PI;
// Approximate the arc using cubic spline segments.
t[0] = cosrx; t[1] = sinrx;
t[2] = -sinrx; t[3] = cosrx;
t[4] = cx; t[5] = cy;
// Split arc into max 90 degree segments.
// The loop assumes an iteration per end point (including start and end), this +1.
ndivs = (int)(fabsf(da) / (NSVG_PI*0.5f) + 1.0f);
hda = (da / (float)ndivs) / 2.0f;
// Fix for ticket #179: division by 0: avoid cotangens around 0 (infinite)
if ((hda < 1e-3f) && (hda > -1e-3f))
hda *= 0.5f;
else
hda = (1.0f - cosf(hda)) / sinf(hda);
kappa = fabsf(4.0f / 3.0f * hda);
if (da < 0.0f)
kappa = -kappa;
for (i = 0; i <= ndivs; i++) {
a = a1 + da * ((float)i/(float)ndivs);
dx = cosf(a);
dy = sinf(a);
nsvg__xformPoint(&x, &y, dx*rx, dy*ry, t); // position
nsvg__xformVec(&tanx, &tany, -dy*rx * kappa, dx*ry * kappa, t); // tangent
if (i > 0)
nsvg__cubicBezTo(p, px+ptanx,py+ptany, x-tanx, y-tany, x, y);
px = x;
py = y;
ptanx = tanx;
ptany = tany;
}
*cpx = x2;
*cpy = y2;
}
static void nsvg__parsePath(NSVGparser* p, const char** attr)
{
const char* s = NULL;
char cmd = '\0';
float args[10];
int nargs;
int rargs = 0;
char initPoint;
float cpx, cpy, cpx2, cpy2;
const char* tmp[4];
char closedFlag;
int i;
char item[64];
for (i = 0; attr[i]; i += 2) {
if (strcmp(attr[i], "d") == 0) {
s = attr[i + 1];
} else {
tmp[0] = attr[i];
tmp[1] = attr[i + 1];
tmp[2] = 0;
tmp[3] = 0;
nsvg__parseAttribs(p, tmp);
}
}
if (s) {
nsvg__resetPath(p);
cpx = 0; cpy = 0;
cpx2 = 0; cpy2 = 0;
initPoint = 0;
closedFlag = 0;
nargs = 0;
while (*s) {
s = nsvg__getNextPathItem(s, item);
if (!*item) break;
if (cmd != '\0' && nsvg__isCoordinate(item)) {
if (nargs < 10)
args[nargs++] = (float)nsvg__atof(item);
if (nargs >= rargs) {
switch (cmd) {
case 'm':
case 'M':
nsvg__pathMoveTo(p, &cpx, &cpy, args, cmd == 'm' ? 1 : 0);
// Moveto can be followed by multiple coordinate pairs,
// which should be treated as linetos.
cmd = (cmd == 'm') ? 'l' : 'L';
rargs = nsvg__getArgsPerElement(cmd);
cpx2 = cpx; cpy2 = cpy;
initPoint = 1;
break;
case 'l':
case 'L':
nsvg__pathLineTo(p, &cpx, &cpy, args, cmd == 'l' ? 1 : 0);
cpx2 = cpx; cpy2 = cpy;
break;
case 'H':
case 'h':
nsvg__pathHLineTo(p, &cpx, &cpy, args, cmd == 'h' ? 1 : 0);
cpx2 = cpx; cpy2 = cpy;
break;
case 'V':
case 'v':
nsvg__pathVLineTo(p, &cpx, &cpy, args, cmd == 'v' ? 1 : 0);
cpx2 = cpx; cpy2 = cpy;
break;
case 'C':
case 'c':
nsvg__pathCubicBezTo(p, &cpx, &cpy, &cpx2, &cpy2, args, cmd == 'c' ? 1 : 0);
break;
case 'S':
case 's':
nsvg__pathCubicBezShortTo(p, &cpx, &cpy, &cpx2, &cpy2, args, cmd == 's' ? 1 : 0);
break;
case 'Q':
case 'q':
nsvg__pathQuadBezTo(p, &cpx, &cpy, &cpx2, &cpy2, args, cmd == 'q' ? 1 : 0);
break;
case 'T':
case 't':
nsvg__pathQuadBezShortTo(p, &cpx, &cpy, &cpx2, &cpy2, args, cmd == 't' ? 1 : 0);
break;
case 'A':
case 'a':
nsvg__pathArcTo(p, &cpx, &cpy, args, cmd == 'a' ? 1 : 0);
cpx2 = cpx; cpy2 = cpy;
break;
default:
if (nargs >= 2) {
cpx = args[nargs-2];
cpy = args[nargs-1];
cpx2 = cpx; cpy2 = cpy;
}
break;
}
nargs = 0;
}
} else {
cmd = item[0];
if (cmd == 'M' || cmd == 'm') {
// Commit path.
if (p->npts > 0)
nsvg__addPath(p, closedFlag);
// Start new subpath.
nsvg__resetPath(p);
closedFlag = 0;
nargs = 0;
} else if (initPoint == 0) {
// Do not allow other commands until initial point has been set (moveTo called once).
cmd = '\0';
}
if (cmd == 'Z' || cmd == 'z') {
closedFlag = 1;
// Commit path.
if (p->npts > 0) {
// Move current point to first point
cpx = p->pts[0];
cpy = p->pts[1];
cpx2 = cpx; cpy2 = cpy;
nsvg__addPath(p, closedFlag);
}
// Start new subpath.
nsvg__resetPath(p);
nsvg__moveTo(p, cpx, cpy);
closedFlag = 0;
nargs = 0;
}
rargs = nsvg__getArgsPerElement(cmd);
if (rargs == -1) {
// Command not recognized
cmd = '\0';
rargs = 0;
}
}
}
// Commit path.
if (p->npts)
nsvg__addPath(p, closedFlag);
}
nsvg__addShape(p);
}
static void nsvg__parseRect(NSVGparser* p, const char** attr)
{
float x = 0.0f;
float y = 0.0f;
float w = 0.0f;
float h = 0.0f;
float rx = -1.0f; // marks not set
float ry = -1.0f;
int i;
for (i = 0; attr[i]; i += 2) {
if (!nsvg__parseAttr(p, attr[i], attr[i + 1])) {
if (strcmp(attr[i], "x") == 0) x = nsvg__parseCoordinate(p, attr[i+1], nsvg__actualOrigX(p), nsvg__actualWidth(p));
if (strcmp(attr[i], "y") == 0) y = nsvg__parseCoordinate(p, attr[i+1], nsvg__actualOrigY(p), nsvg__actualHeight(p));
if (strcmp(attr[i], "width") == 0) w = nsvg__parseCoordinate(p, attr[i+1], 0.0f, nsvg__actualWidth(p));
if (strcmp(attr[i], "height") == 0) h = nsvg__parseCoordinate(p, attr[i+1], 0.0f, nsvg__actualHeight(p));
if (strcmp(attr[i], "rx") == 0) rx = fabsf(nsvg__parseCoordinate(p, attr[i+1], 0.0f, nsvg__actualWidth(p)));
if (strcmp(attr[i], "ry") == 0) ry = fabsf(nsvg__parseCoordinate(p, attr[i+1], 0.0f, nsvg__actualHeight(p)));
}
}
if (rx < 0.0f && ry > 0.0f) rx = ry;
if (ry < 0.0f && rx > 0.0f) ry = rx;
if (rx < 0.0f) rx = 0.0f;
if (ry < 0.0f) ry = 0.0f;
if (rx > w/2.0f) rx = w/2.0f;
if (ry > h/2.0f) ry = h/2.0f;
if (w != 0.0f && h != 0.0f) {
nsvg__resetPath(p);
if (rx < 0.00001f || ry < 0.0001f) {
nsvg__moveTo(p, x, y);
nsvg__lineTo(p, x+w, y);
nsvg__lineTo(p, x+w, y+h);
nsvg__lineTo(p, x, y+h);
} else {
// Rounded rectangle
nsvg__moveTo(p, x+rx, y);
nsvg__lineTo(p, x+w-rx, y);
nsvg__cubicBezTo(p, x+w-rx*(1-NSVG_KAPPA90), y, x+w, y+ry*(1-NSVG_KAPPA90), x+w, y+ry);
nsvg__lineTo(p, x+w, y+h-ry);
nsvg__cubicBezTo(p, x+w, y+h-ry*(1-NSVG_KAPPA90), x+w-rx*(1-NSVG_KAPPA90), y+h, x+w-rx, y+h);
nsvg__lineTo(p, x+rx, y+h);
nsvg__cubicBezTo(p, x+rx*(1-NSVG_KAPPA90), y+h, x, y+h-ry*(1-NSVG_KAPPA90), x, y+h-ry);
nsvg__lineTo(p, x, y+ry);
nsvg__cubicBezTo(p, x, y+ry*(1-NSVG_KAPPA90), x+rx*(1-NSVG_KAPPA90), y, x+rx, y);
}
nsvg__addPath(p, 1);
nsvg__addShape(p);
}
}
static void nsvg__parseCircle(NSVGparser* p, const char** attr)
{
float cx = 0.0f;
float cy = 0.0f;
float r = 0.0f;
int i;
for (i = 0; attr[i]; i += 2) {
if (!nsvg__parseAttr(p, attr[i], attr[i + 1])) {
if (strcmp(attr[i], "cx") == 0) cx = nsvg__parseCoordinate(p, attr[i+1], nsvg__actualOrigX(p), nsvg__actualWidth(p));
if (strcmp(attr[i], "cy") == 0) cy = nsvg__parseCoordinate(p, attr[i+1], nsvg__actualOrigY(p), nsvg__actualHeight(p));
if (strcmp(attr[i], "r") == 0) r = fabsf(nsvg__parseCoordinate(p, attr[i+1], 0.0f, nsvg__actualLength(p)));
}
}
if (r > 0.0f) {
nsvg__resetPath(p);
nsvg__moveTo(p, cx+r, cy);
nsvg__cubicBezTo(p, cx+r, cy+r*NSVG_KAPPA90, cx+r*NSVG_KAPPA90, cy+r, cx, cy+r);
nsvg__cubicBezTo(p, cx-r*NSVG_KAPPA90, cy+r, cx-r, cy+r*NSVG_KAPPA90, cx-r, cy);
nsvg__cubicBezTo(p, cx-r, cy-r*NSVG_KAPPA90, cx-r*NSVG_KAPPA90, cy-r, cx, cy-r);
nsvg__cubicBezTo(p, cx+r*NSVG_KAPPA90, cy-r, cx+r, cy-r*NSVG_KAPPA90, cx+r, cy);
nsvg__addPath(p, 1);
nsvg__addShape(p);
}
}
static void nsvg__parseEllipse(NSVGparser* p, const char** attr)
{
float cx = 0.0f;
float cy = 0.0f;
float rx = 0.0f;
float ry = 0.0f;
int i;
for (i = 0; attr[i]; i += 2) {
if (!nsvg__parseAttr(p, attr[i], attr[i + 1])) {
if (strcmp(attr[i], "cx") == 0) cx = nsvg__parseCoordinate(p, attr[i+1], nsvg__actualOrigX(p), nsvg__actualWidth(p));
if (strcmp(attr[i], "cy") == 0) cy = nsvg__parseCoordinate(p, attr[i+1], nsvg__actualOrigY(p), nsvg__actualHeight(p));
if (strcmp(attr[i], "rx") == 0) rx = fabsf(nsvg__parseCoordinate(p, attr[i+1], 0.0f, nsvg__actualWidth(p)));
if (strcmp(attr[i], "ry") == 0) ry = fabsf(nsvg__parseCoordinate(p, attr[i+1], 0.0f, nsvg__actualHeight(p)));
}
}
if (rx > 0.0f && ry > 0.0f) {
nsvg__resetPath(p);
nsvg__moveTo(p, cx+rx, cy);
nsvg__cubicBezTo(p, cx+rx, cy+ry*NSVG_KAPPA90, cx+rx*NSVG_KAPPA90, cy+ry, cx, cy+ry);
nsvg__cubicBezTo(p, cx-rx*NSVG_KAPPA90, cy+ry, cx-rx, cy+ry*NSVG_KAPPA90, cx-rx, cy);
nsvg__cubicBezTo(p, cx-rx, cy-ry*NSVG_KAPPA90, cx-rx*NSVG_KAPPA90, cy-ry, cx, cy-ry);
nsvg__cubicBezTo(p, cx+rx*NSVG_KAPPA90, cy-ry, cx+rx, cy-ry*NSVG_KAPPA90, cx+rx, cy);
nsvg__addPath(p, 1);
nsvg__addShape(p);
}
}
static void nsvg__parseLine(NSVGparser* p, const char** attr)
{
float x1 = 0.0;
float y1 = 0.0;
float x2 = 0.0;
float y2 = 0.0;
int i;
for (i = 0; attr[i]; i += 2) {
if (!nsvg__parseAttr(p, attr[i], attr[i + 1])) {
if (strcmp(attr[i], "x1") == 0) x1 = nsvg__parseCoordinate(p, attr[i + 1], nsvg__actualOrigX(p), nsvg__actualWidth(p));
if (strcmp(attr[i], "y1") == 0) y1 = nsvg__parseCoordinate(p, attr[i + 1], nsvg__actualOrigY(p), nsvg__actualHeight(p));
if (strcmp(attr[i], "x2") == 0) x2 = nsvg__parseCoordinate(p, attr[i + 1], nsvg__actualOrigX(p), nsvg__actualWidth(p));
if (strcmp(attr[i], "y2") == 0) y2 = nsvg__parseCoordinate(p, attr[i + 1], nsvg__actualOrigY(p), nsvg__actualHeight(p));
}
}
nsvg__resetPath(p);
nsvg__moveTo(p, x1, y1);
nsvg__lineTo(p, x2, y2);
nsvg__addPath(p, 0);
nsvg__addShape(p);
}
static void nsvg__parsePoly(NSVGparser* p, const char** attr, int closeFlag)
{
int i;
const char* s;
float args[2];
int nargs, npts = 0;
char item[64];
nsvg__resetPath(p);
for (i = 0; attr[i]; i += 2) {
if (!nsvg__parseAttr(p, attr[i], attr[i + 1])) {
if (strcmp(attr[i], "points") == 0) {
s = attr[i + 1];
nargs = 0;
while (*s) {
s = nsvg__getNextPathItem(s, item);
args[nargs++] = (float)nsvg__atof(item);
if (nargs >= 2) {
if (npts == 0)
nsvg__moveTo(p, args[0], args[1]);
else
nsvg__lineTo(p, args[0], args[1]);
nargs = 0;
npts++;
}
}
}
}
}
nsvg__addPath(p, (char)closeFlag);
nsvg__addShape(p);
}
static void nsvg__parseSVG(NSVGparser* p, const char** attr)
{
int i;
for (i = 0; attr[i]; i += 2) {
if (!nsvg__parseAttr(p, attr[i], attr[i + 1])) {
if (strcmp(attr[i], "width") == 0) {
p->image->width = nsvg__parseCoordinate(p, attr[i + 1], 0.0f, 0.0f);
} 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) {
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
p->alignType = NSVG_ALIGN_NONE;
} else {
// Parse X align
if (strstr(attr[i + 1], "xMin") != 0)
p->alignX = NSVG_ALIGN_MIN;
else if (strstr(attr[i + 1], "xMid") != 0)
p->alignX = NSVG_ALIGN_MID;
else if (strstr(attr[i + 1], "xMax") != 0)
p->alignX = NSVG_ALIGN_MAX;
// Parse X align
if (strstr(attr[i + 1], "yMin") != 0)
p->alignY = NSVG_ALIGN_MIN;
else if (strstr(attr[i + 1], "yMid") != 0)
p->alignY = NSVG_ALIGN_MID;
else if (strstr(attr[i + 1], "yMax") != 0)
p->alignY = NSVG_ALIGN_MAX;
// Parse meet/slice
p->alignType = NSVG_ALIGN_MEET;
if (strstr(attr[i + 1], "slice") != 0)
p->alignType = NSVG_ALIGN_SLICE;
}
}
}
}
}
static void nsvg__parseGradient(NSVGparser* p, const char** attr, char type)
{
int i;
NSVGgradientData* grad = (NSVGgradientData*)malloc(sizeof(NSVGgradientData));
if (grad == NULL) return;
memset(grad, 0, sizeof(NSVGgradientData));
grad->units = NSVG_OBJECT_SPACE;
grad->type = type;
if (grad->type == NSVG_PAINT_LINEAR_GRADIENT) {
grad->linear.x1 = nsvg__coord(0.0f, NSVG_UNITS_PERCENT);
grad->linear.y1 = nsvg__coord(0.0f, NSVG_UNITS_PERCENT);
grad->linear.x2 = nsvg__coord(100.0f, NSVG_UNITS_PERCENT);
grad->linear.y2 = nsvg__coord(0.0f, NSVG_UNITS_PERCENT);
} else if (grad->type == NSVG_PAINT_RADIAL_GRADIENT) {
grad->radial.cx = nsvg__coord(50.0f, NSVG_UNITS_PERCENT);
grad->radial.cy = nsvg__coord(50.0f, NSVG_UNITS_PERCENT);
grad->radial.r = nsvg__coord(50.0f, NSVG_UNITS_PERCENT);
}
nsvg__xformIdentity(grad->xform);
for (i = 0; attr[i]; i += 2) {
if (strcmp(attr[i], "id") == 0) {
strncpy(grad->id, attr[i+1], 63);
grad->id[63] = '\0';
} else if (!nsvg__parseAttr(p, attr[i], attr[i + 1])) {
if (strcmp(attr[i], "gradientUnits") == 0) {
if (strcmp(attr[i+1], "objectBoundingBox") == 0)
grad->units = NSVG_OBJECT_SPACE;
else
grad->units = NSVG_USER_SPACE;
} else if (strcmp(attr[i], "gradientTransform") == 0) {
nsvg__parseTransform(grad->xform, attr[i + 1]);
} else if (strcmp(attr[i], "cx") == 0) {
grad->radial.cx = nsvg__parseCoordinateRaw(attr[i + 1]);
} else if (strcmp(attr[i], "cy") == 0) {
grad->radial.cy = nsvg__parseCoordinateRaw(attr[i + 1]);
} else if (strcmp(attr[i], "r") == 0) {
grad->radial.r = nsvg__parseCoordinateRaw(attr[i + 1]);
} else if (strcmp(attr[i], "fx") == 0) {
grad->radial.fx = nsvg__parseCoordinateRaw(attr[i + 1]);
} else if (strcmp(attr[i], "fy") == 0) {
grad->radial.fy = nsvg__parseCoordinateRaw(attr[i + 1]);
} else if (strcmp(attr[i], "x1") == 0) {
grad->linear.x1 = nsvg__parseCoordinateRaw(attr[i + 1]);
} else if (strcmp(attr[i], "y1") == 0) {
grad->linear.y1 = nsvg__parseCoordinateRaw(attr[i + 1]);
} else if (strcmp(attr[i], "x2") == 0) {
grad->linear.x2 = nsvg__parseCoordinateRaw(attr[i + 1]);
} else if (strcmp(attr[i], "y2") == 0) {
grad->linear.y2 = nsvg__parseCoordinateRaw(attr[i + 1]);
} else if (strcmp(attr[i], "spreadMethod") == 0) {
if (strcmp(attr[i+1], "pad") == 0)
grad->spread = NSVG_SPREAD_PAD;
else if (strcmp(attr[i+1], "reflect") == 0)
grad->spread = NSVG_SPREAD_REFLECT;
else if (strcmp(attr[i+1], "repeat") == 0)
grad->spread = NSVG_SPREAD_REPEAT;
} else if (strcmp(attr[i], "xlink:href") == 0) {
const char *href = attr[i+1];
strncpy(grad->ref, href+1, 62);
grad->ref[62] = '\0';
}
}
}
grad->next = p->gradients;
p->gradients = grad;
}
static void nsvg__parseGradientStop(NSVGparser* p, const char** attr)
{
NSVGattrib* curAttr = nsvg__getAttr(p);
NSVGgradientData* grad;
NSVGgradientStop* stop;
int i, idx;
curAttr->stopOffset = 0;
curAttr->stopColor = 0;
curAttr->stopOpacity = 1.0f;
for (i = 0; attr[i]; i += 2) {
nsvg__parseAttr(p, attr[i], attr[i + 1]);
}
// Add stop to the last gradient.
grad = p->gradients;
if (grad == NULL) return;
grad->nstops++;
grad->stops = (NSVGgradientStop*)realloc(grad->stops, sizeof(NSVGgradientStop)*grad->nstops);
if (grad->stops == NULL) return;
// Insert
idx = grad->nstops-1;
for (i = 0; i < grad->nstops-1; i++) {
if (curAttr->stopOffset < grad->stops[i].offset) {
idx = i;
break;
}
}
if (idx != grad->nstops-1) {
for (i = grad->nstops-1; i > idx; i--)
grad->stops[i] = grad->stops[i-1];
}
stop = &grad->stops[idx];
stop->color = curAttr->stopColor;
stop->color |= (unsigned int)(curAttr->stopOpacity*255) << 24;
stop->offset = curAttr->stopOffset;
}
static void nsvg__startElement(void* ud, const char* el, const char** attr)
{
NSVGparser* p = (NSVGparser*)ud;
if (p->defsFlag) {
// Skip everything but gradients in defs
if (strcmp(el, "linearGradient") == 0) {
nsvg__parseGradient(p, attr, NSVG_PAINT_LINEAR_GRADIENT);
} else if (strcmp(el, "radialGradient") == 0) {
nsvg__parseGradient(p, attr, NSVG_PAINT_RADIAL_GRADIENT);
} else if (strcmp(el, "stop") == 0) {
nsvg__parseGradientStop(p, attr);
}
return;
}
if (strcmp(el, "g") == 0) {
nsvg__pushAttr(p);
nsvg__parseAttribs(p, attr);
} else if (strcmp(el, "path") == 0) {
if (p->pathFlag) // Do not allow nested paths.
return;
nsvg__pushAttr(p);
nsvg__parsePath(p, attr);
nsvg__popAttr(p);
} else if (strcmp(el, "rect") == 0) {
nsvg__pushAttr(p);
nsvg__parseRect(p, attr);
nsvg__popAttr(p);
} else if (strcmp(el, "circle") == 0) {
nsvg__pushAttr(p);
nsvg__parseCircle(p, attr);
nsvg__popAttr(p);
} else if (strcmp(el, "ellipse") == 0) {
nsvg__pushAttr(p);
nsvg__parseEllipse(p, attr);
nsvg__popAttr(p);
} else if (strcmp(el, "line") == 0) {
nsvg__pushAttr(p);
nsvg__parseLine(p, attr);
nsvg__popAttr(p);
} else if (strcmp(el, "polyline") == 0) {
nsvg__pushAttr(p);
nsvg__parsePoly(p, attr, 0);
nsvg__popAttr(p);
} else if (strcmp(el, "polygon") == 0) {
nsvg__pushAttr(p);
nsvg__parsePoly(p, attr, 1);
nsvg__popAttr(p);
} else if (strcmp(el, "linearGradient") == 0) {
nsvg__parseGradient(p, attr, NSVG_PAINT_LINEAR_GRADIENT);
} else if (strcmp(el, "radialGradient") == 0) {
nsvg__parseGradient(p, attr, NSVG_PAINT_RADIAL_GRADIENT);
} else if (strcmp(el, "stop") == 0) {
nsvg__parseGradientStop(p, attr);
} else if (strcmp(el, "defs") == 0) {
p->defsFlag = 1;
} else if (strcmp(el, "svg") == 0) {
nsvg__parseSVG(p, attr);
}
}
static void nsvg__endElement(void* ud, const char* el)
{
NSVGparser* p = (NSVGparser*)ud;
if (strcmp(el, "g") == 0) {
nsvg__popAttr(p);
} else if (strcmp(el, "path") == 0) {
p->pathFlag = 0;
} else if (strcmp(el, "defs") == 0) {
p->defsFlag = 0;
}
}
static void nsvg__content(void* ud, const char* s)
{
NSVG_NOTUSED(ud);
NSVG_NOTUSED(s);
// empty
}
static void nsvg__imageBounds(NSVGparser* p, float* bounds)
{
NSVGshape* shape;
shape = p->image->shapes;
if (shape == NULL) {
bounds[0] = bounds[1] = bounds[2] = bounds[3] = 0.0;
return;
}
bounds[0] = shape->bounds[0];
bounds[1] = shape->bounds[1];
bounds[2] = shape->bounds[2];
bounds[3] = shape->bounds[3];
for (shape = shape->next; shape != NULL; shape = shape->next) {
bounds[0] = nsvg__minf(bounds[0], shape->bounds[0]);
bounds[1] = nsvg__minf(bounds[1], shape->bounds[1]);
bounds[2] = nsvg__maxf(bounds[2], shape->bounds[2]);
bounds[3] = nsvg__maxf(bounds[3], shape->bounds[3]);
}
}
static float nsvg__viewAlign(float content, float container, int type)
{
if (type == NSVG_ALIGN_MIN)
return 0;
else if (type == NSVG_ALIGN_MAX)
return container - content;
// mid
return (container - content) * 0.5f;
}
static void nsvg__scaleGradient(NSVGgradient* grad, float tx, float ty, float sx, float sy)
{
float t[6];
nsvg__xformSetTranslation(t, tx, ty);
nsvg__xformMultiply (grad->xform, t);
nsvg__xformSetScale(t, sx, sy);
nsvg__xformMultiply (grad->xform, t);
}
static void nsvg__scaleToViewbox(NSVGparser* p, const char* units)
{
NSVGshape* shape;
NSVGpath* path;
float tx, ty, sx, sy, us, bounds[4], t[6], avgs;
int i;
float* pt;
// Guess image size if not set completely.
nsvg__imageBounds(p, bounds);
if (p->viewWidth == 0) {
if (p->image->width > 0) {
p->viewWidth = p->image->width;
} else {
p->viewMinx = bounds[0];
p->viewWidth = bounds[2] - bounds[0];
}
}
if (p->viewHeight == 0) {
if (p->image->height > 0) {
p->viewHeight = p->image->height;
} else {
p->viewMiny = bounds[1];
p->viewHeight = bounds[3] - bounds[1];
}
}
if (p->image->width == 0)
p->image->width = p->viewWidth;
if (p->image->height == 0)
p->image->height = p->viewHeight;
tx = -p->viewMinx;
ty = -p->viewMiny;
sx = p->viewWidth > 0 ? p->image->width / p->viewWidth : 0;
sy = p->viewHeight > 0 ? p->image->height / p->viewHeight : 0;
// Unit scaling
us = 1.0f / nsvg__convertToPixels(p, nsvg__coord(1.0f, nsvg__parseUnits(units)), 0.0f, 1.0f);
// Fix aspect ratio
if (p->alignType == NSVG_ALIGN_MEET) {
// fit whole image into viewbox
sx = sy = nsvg__minf(sx, sy);
tx += nsvg__viewAlign(p->viewWidth*sx, p->image->width, p->alignX) / sx;
ty += nsvg__viewAlign(p->viewHeight*sy, p->image->height, p->alignY) / sy;
} else if (p->alignType == NSVG_ALIGN_SLICE) {
// fill whole viewbox with image
sx = sy = nsvg__maxf(sx, sy);
tx += nsvg__viewAlign(p->viewWidth*sx, p->image->width, p->alignX) / sx;
ty += nsvg__viewAlign(p->viewHeight*sy, p->image->height, p->alignY) / sy;
}
// Transform
sx *= us;
sy *= us;
avgs = (sx+sy) / 2.0f;
for (shape = p->image->shapes; shape != NULL; shape = shape->next) {
shape->bounds[0] = (shape->bounds[0] + tx) * sx;
shape->bounds[1] = (shape->bounds[1] + ty) * sy;
shape->bounds[2] = (shape->bounds[2] + tx) * sx;
shape->bounds[3] = (shape->bounds[3] + ty) * sy;
for (path = shape->paths; path != NULL; path = path->next) {
path->bounds[0] = (path->bounds[0] + tx) * sx;
path->bounds[1] = (path->bounds[1] + ty) * sy;
path->bounds[2] = (path->bounds[2] + tx) * sx;
path->bounds[3] = (path->bounds[3] + ty) * sy;
for (i =0; i < path->npts; i++) {
pt = &path->pts[i*2];
pt[0] = (pt[0] + tx) * sx;
pt[1] = (pt[1] + ty) * sy;
}
}
if (shape->fill.type == NSVG_PAINT_LINEAR_GRADIENT || shape->fill.type == NSVG_PAINT_RADIAL_GRADIENT) {
nsvg__scaleGradient(shape->fill.gradient, tx,ty, sx,sy);
memcpy(t, shape->fill.gradient->xform, sizeof(float)*6);
nsvg__xformInverse(shape->fill.gradient->xform, t);
}
if (shape->stroke.type == NSVG_PAINT_LINEAR_GRADIENT || shape->stroke.type == NSVG_PAINT_RADIAL_GRADIENT) {
nsvg__scaleGradient(shape->stroke.gradient, tx,ty, sx,sy);
memcpy(t, shape->stroke.gradient->xform, sizeof(float)*6);
nsvg__xformInverse(shape->stroke.gradient->xform, t);
}
shape->strokeWidth *= avgs;
shape->strokeDashOffset *= avgs;
for (i = 0; i < shape->strokeDashCount; i++)
shape->strokeDashArray[i] *= avgs;
}
}
NSVGimage* nsvgParse(char* input, const char* units, float dpi)
{
NSVGparser* p;
NSVGimage* ret = 0;
p = nsvg__createParser();
if (p == NULL) {
return NULL;
}
p->dpi = dpi;
nsvg__parseXML(input, nsvg__startElement, nsvg__endElement, nsvg__content, p);
// Scale to viewBox
nsvg__scaleToViewbox(p, units);
ret = p->image;
p->image = NULL;
nsvg__deleteParser(p);
return ret;
}
NSVGimage* nsvgParseFromFile(const char* filename, const char* units, float dpi)
{
FILE* fp = NULL;
size_t size;
char* data = NULL;
NSVGimage* image = NULL;
fp = fopen(filename, "rb");
if (!fp) goto error;
fseek(fp, 0, SEEK_END);
size = ftell(fp);
fseek(fp, 0, SEEK_SET);
data = (char*)malloc(size+1);
if (data == NULL) goto error;
if (fread(data, 1, size, fp) != size) goto error;
data[size] = '\0'; // Must be null terminated.
fclose(fp);
image = nsvgParse(data, units, dpi);
free(data);
return image;
error:
if (fp) fclose(fp);
if (data) free(data);
if (image) nsvgDelete(image);
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;
if (image == NULL) return;
shape = image->shapes;
while (shape != NULL) {
snext = shape->next;
nsvg__deletePaths(shape->paths);
nsvg__deletePaint(&shape->fill);
nsvg__deletePaint(&shape->stroke);
free(shape);
shape = snext;
}
free(image);
}
#endif