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/*
* Copyright (c) 2013-14 Mikko Mononen [email protected]
*
* 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
*
* Fork developement, feature integration and new bugs:
* Ketmar // Invisible Vector <[email protected]>
* Contains code from various contributors.
*/
/**
NanoVega.SVG is a simple stupid SVG parser. The output of the parser is a list of drawing commands.
The library suits well for anything from rendering scalable icons in your editor application to prototyping a game.
NanoVega.SVG supports a wide range of SVG features, but something may be missing. Your's Captain Obvious.
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.
NanoVega.SVG 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 NanoVega.SVG should be one of: 'px', 'pt', 'pc', 'mm', 'cm', '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
NSVG* image = nsvgParseFromFile("test.svg", "px", 96);
printf("size: %f x %f\n", image.width, image.height);
// Use...
image.forEachShape((in ref NSVG.Shape shape) {
if (!shape.visible) return;
shape.forEachPath((in ref NSVG.Path path) {
// this will issue final `LineTo` for closed pathes
path.forEachCommand!true(delegate (NSVG.Command cmd, const(float)[] args) nothrow @trusted @nogc {
final switch (cmd) {
case NSVG.Command.MoveTo: nvg.moveTo(args); break;
case NSVG.Command.LineTo: nvg.lineTo(args); break;
case NSVG.Command.QuadTo: nvg.quadTo(args); break;
case NSVG.Command.BezierTo: nvg.bezierTo(args); break;
}
});
});
});
NSVGrasterizer rast = nsvgCreateRasterizer();
// Allocate memory for image
ubyte* img = malloc(w*h*4);
// Rasterize
rasterize(rast, image, 0, 0, 1, img, w, h, w*4);
// Delete
image.kill();
---
To turn a SVG into a png:
---
import arsd.svg;
import arsd.png;
void main() {
// Load
NSVG* image = nsvgParseFromFile("test.svg", "px", 96);
int w = 200;
int h = 200;
NSVGrasterizer rast = nsvgCreateRasterizer();
// Allocate memory for image
auto img = new TrueColorImage(w, h);
// Rasterize
rasterize(rast, image, 0, 0, 1, img.imageData.bytes.ptr, w, h, w*4);
// Delete
image.kill();
writePng("test.png", img);
}
---
*/
module arsd.svg;
private import core.stdc.math : fabs, fabsf, atan2f, acosf, cosf, sinf, tanf, sqrt, sqrtf, floorf, ceilf, fmodf;
//private import iv.vfs;
version(nanosvg_disable_vfs) {
enum NanoSVGHasIVVFS = false;
} else {
static if (is(typeof((){import iv.vfs;}))) {
enum NanoSVGHasIVVFS = true;
import iv.vfs;
} else {
enum NanoSVGHasIVVFS = false;
}
}
version(aliced) {} else {
private alias usize = size_t;
}
version = nanosvg_crappy_stylesheet_parser;
//version = nanosvg_debug_styles;
//version(rdmd) import iv.strex;
//version = nanosvg_use_beziers; // convert everything to beziers
//version = nanosvg_only_cubic_beziers; // convert everything to cubic beziers
///
public enum NSVGDefaults {
CanvasWidth = 800,
CanvasHeight = 600,
}
// ////////////////////////////////////////////////////////////////////////// //
public alias NSVGrasterizer = NSVGrasterizerS*; ///
public alias NSVGRasterizer = NSVGrasterizer; ///
///
struct NSVG {
@disable this (this);
///
enum Command : int {
MoveTo, ///
LineTo, ///
QuadTo, ///
BezierTo, /// cubic bezier
}
///
enum PaintType : ubyte {
None, ///
Color, ///
LinearGradient, ///
RadialGradient, ///
}
///
enum SpreadType : ubyte {
Pad, ///
Reflect, ///
Repeat, ///
}
///
enum LineJoin : ubyte {
Miter, ///
Round, ///
Bevel, ///
}
///
enum LineCap : ubyte {
Butt, ///
Round, ///
Square, ///
}
///
enum FillRule : ubyte {
NonZero, ///
EvenOdd, ///
}
alias Flags = ubyte; ///
enum : ubyte {
Visible = 0x01, ///
}
///
static struct GradientStop {
uint color; ///
float offset; ///
}
///
static struct Gradient {
float[6] xform; ///
SpreadType spread; ///
float fx, fy; ///
int nstops; ///
GradientStop[0] stops; ///
}
///
static struct Paint {
pure nothrow @safe @nogc:
@disable this (this);
PaintType type; ///
union {
uint color; ///
Gradient* gradient; ///
}
static uint rgb (ubyte r, ubyte g, ubyte b) { pragma(inline, true); return (r|(g<<8)|(b<<16)); } ///
@property const {
bool isNone () { pragma(inline, true); return (type == PaintType.None); } ///
bool isColor () { pragma(inline, true); return (type == PaintType.Color); } ///
// gradient types
bool isLinear () { pragma(inline, true); return (type == PaintType.LinearGradient); } ///
bool isRadial () { pragma(inline, true); return (type == PaintType.RadialGradient); } ///
// color
ubyte r () { pragma(inline, true); return color&0xff; } ///
ubyte g () { pragma(inline, true); return (color>>8)&0xff; } ///
ubyte b () { pragma(inline, true); return (color>>16)&0xff; } ///
ubyte a () { pragma(inline, true); return (color>>24)&0xff; } ///
}
}
///
static struct Path {
@disable this (this);
float* stream; /// Command, args...; Cubic bezier points: x0,y0, [cpx1,cpx1,cpx2,cpy2,x1,y1], ...
int nsflts; /// Total number of floats in stream.
bool closed; /// Flag indicating if shapes should be treated as closed.
float[4] bounds; /// Tight bounding box of the shape [minx,miny,maxx,maxy].
NSVG.Path* next; /// Pointer to next path, or null if last element.
///
@property bool empty () const pure nothrow @safe @nogc { pragma(inline, true); return (nsflts == 0); }
///
float startX () const nothrow @trusted @nogc {
pragma(inline, true);
return (nsflts >= 3 && cast(Command)stream[0] == Command.MoveTo ? stream[1] : float.nan);
}
///
float startY () const nothrow @trusted @nogc {
pragma(inline, true);
return (nsflts >= 3 && cast(Command)stream[0] == Command.MoveTo ? stream[2] : float.nan);
}
///
bool startPoint (float* dx, float* dy) const nothrow @trusted @nogc {
if (nsflts >= 3 && cast(Command)stream[0] == Command.MoveTo) {
if (dx !is null) *dx = stream[1];
if (dy !is null) *dy = stream[2];
return true;
} else {
if (dx !is null) *dx = 0;
if (dy !is null) *dy = 0;
return false;
}
}
///
int countCubics () const nothrow @trusted @nogc {
if (nsflts < 3) return 0;
int res = 0, argc;
for (int pidx = 0; pidx+3 <= nsflts; ) {
final switch (cast(Command)stream[pidx++]) {
case Command.MoveTo: argc = 2; break;
case Command.LineTo: argc = 2; ++res; break;
case Command.QuadTo: argc = 4; ++res; break;
case Command.BezierTo: argc = 6; ++res; break;
}
if (pidx+argc > nsflts) break; // just in case
pidx += argc;
}
return res;
}
///
int countCommands(bool synthesizeCloseCommand=true) () const nothrow @trusted @nogc {
if (nsflts < 3) return 0;
int res = 0, argc;
for (int pidx = 0; pidx+3 <= nsflts; ) {
++res;
final switch (cast(Command)stream[pidx++]) {
case Command.MoveTo: argc = 2; break;
case Command.LineTo: argc = 2; break;
case Command.QuadTo: argc = 4; break;
case Command.BezierTo: argc = 6; break;
}
if (pidx+argc > nsflts) break; // just in case
pidx += argc;
}
static if (synthesizeCloseCommand) { if (closed) ++res; }
return res;
}
/// emits cubic beziers.
/// if `withMoveTo` is `false`, issue 8-arg commands for cubic beziers (i.e. include starting point).
/// if `withMoveTo` is `true`, issue 2-arg command for `moveTo`, and 6-arg command for cubic beziers.
void asCubics(bool withMoveTo=false, DG) (scope DG dg) inout if (__traits(compiles, (){ DG xdg; float[] f; xdg(f); })) {
if (dg is null) return;
if (nsflts < 3) return;
enum HasRes = __traits(compiles, (){ DG xdg; float[] f; bool res = xdg(f); });
float cx = 0, cy = 0;
float[8] cubic = void;
void synthLine (in float cx, in float cy, in float x, in float y) nothrow @trusted @nogc {
immutable float dx = x-cx;
immutable float dy = y-cy;
cubic.ptr[0] = cx;
cubic.ptr[1] = cy;
cubic.ptr[2] = cx+dx/3.0f;
cubic.ptr[3] = cy+dy/3.0f;
cubic.ptr[4] = x-dx/3.0f;
cubic.ptr[5] = y-dy/3.0f;
cubic.ptr[6] = x;
cubic.ptr[7] = y;
}
void synthQuad (in float cx, in float cy, in float x1, in float y1, in float x2, in float y2) nothrow @trusted @nogc {
immutable float cx1 = x1+2.0f/3.0f*(cx-x1);
immutable float cy1 = y1+2.0f/3.0f*(cy-y1);
immutable float cx2 = x2+2.0f/3.0f*(cx-x2);
immutable float cy2 = y2+2.0f/3.0f*(cy-y2);
cubic.ptr[0] = cx;
cubic.ptr[1] = cy;
cubic.ptr[2] = cx1;
cubic.ptr[3] = cy2;
cubic.ptr[4] = cx2;
cubic.ptr[5] = cy2;
cubic.ptr[6] = x2;
cubic.ptr[7] = y2;
}
for (int pidx = 0; pidx+3 <= nsflts; ) {
final switch (cast(Command)stream[pidx++]) {
case Command.MoveTo:
static if (withMoveTo) {
static if (HasRes) { if (dg(stream[pidx+0..pidx+2])) return; } else { dg(stream[pidx+0..pidx+2]); }
}
cx = stream[pidx++];
cy = stream[pidx++];
continue;
case Command.LineTo:
synthLine(cx, cy, stream[pidx+0], stream[pidx+1]);
pidx += 2;
break;
case Command.QuadTo:
synthQuad(cx, cy, stream[pidx+0], stream[pidx+1], stream[pidx+2], stream[pidx+3]);
pidx += 4;
break;
case Command.BezierTo:
cubic.ptr[0] = cx;
cubic.ptr[1] = cy;
cubic.ptr[2..8] = stream[pidx..pidx+6];
pidx += 6;
break;
}
cx = cubic.ptr[6];
cy = cubic.ptr[7];
static if (withMoveTo) {
static if (HasRes) { if (dg(cubic[2..8])) return; } else { dg(cubic[2..8]); }
} else {
static if (HasRes) { if (dg(cubic[])) return; } else { dg(cubic[]); }
}
}
}
/// if `synthesizeCloseCommand` is true, and the path is closed, this emits line to the first point.
void forEachCommand(bool synthesizeCloseCommand=true, DG) (scope DG dg) inout
if (__traits(compiles, (){ DG xdg; Command c; const(float)[] f; xdg(c, f); }))
{
if (dg is null) return;
if (nsflts < 3) return;
enum HasRes = __traits(compiles, (){ DG xdg; Command c; const(float)[] f; bool res = xdg(c, f); });
int argc;
Command cmd;
for (int pidx = 0; pidx+3 <= nsflts; ) {
cmd = cast(Command)stream[pidx++];
final switch (cmd) {
case Command.MoveTo: argc = 2; break;
case Command.LineTo: argc = 2; break;
case Command.QuadTo: argc = 4; break;
case Command.BezierTo: argc = 6; break;
}
if (pidx+argc > nsflts) break; // just in case
static if (HasRes) { if (dg(cmd, stream[pidx..pidx+argc])) return; } else { dg(cmd, stream[pidx..pidx+argc]); }
pidx += argc;
}
static if (synthesizeCloseCommand) {
if (closed && cast(Command)stream[0] == Command.MoveTo) {
static if (HasRes) { if (dg(Command.LineTo, stream[1..3])) return; } else { dg(Command.LineTo, stream[1..3]); }
}
}
}
}
///
static struct Shape {
@disable this (this);
char[64] id = 0; /// Optional 'id' attr of the shape or its group
NSVG.Paint fill; /// Fill paint
NSVG.Paint stroke; /// Stroke paint
float opacity; /// Opacity of the shape.
float strokeWidth; /// Stroke width (scaled).
float strokeDashOffset; /// Stroke dash offset (scaled).
float[8] strokeDashArray; /// Stroke dash array (scaled).
byte strokeDashCount; /// Number of dash values in dash array.
LineJoin strokeLineJoin; /// Stroke join type.
LineCap strokeLineCap; /// Stroke cap type.
float miterLimit; /// Miter limit
FillRule fillRule; /// Fill rule, see FillRule.
/*Flags*/ubyte flags; /// Logical or of NSVG_FLAGS_* flags
float[4] bounds; /// Tight bounding box of the shape [minx,miny,maxx,maxy].
NSVG.Path* paths; /// Linked list of paths in the image.
NSVG.Shape* next; /// Pointer to next shape, or null if last element.
@property bool visible () const pure nothrow @safe @nogc { pragma(inline, true); return ((flags&Visible) != 0); } ///
/// delegate can accept:
/// NSVG.Path*
/// const(NSVG.Path)*
/// ref NSVG.Path
/// in ref NSVG.Path
/// delegate can return:
/// void
/// bool (true means `stop`)
void forEachPath(DG) (scope DG dg) inout
if (__traits(compiles, (){ DG xdg; NSVG.Path s; xdg(&s); }) ||
__traits(compiles, (){ DG xdg; NSVG.Path s; xdg(s); }))
{
if (dg is null) return;
enum WantPtr = __traits(compiles, (){ DG xdg; NSVG.Path s; xdg(&s); });
static if (WantPtr) {
enum HasRes = __traits(compiles, (){ DG xdg; NSVG.Path s; bool res = xdg(&s); });
} else {
enum HasRes = __traits(compiles, (){ DG xdg; NSVG.Path s; bool res = xdg(s); });
}
static if (__traits(compiles, (){ NSVG.Path* s = this.paths; })) {
alias TP = NSVG.Path*;
} else {
alias TP = const(NSVG.Path)*;
}
for (TP path = paths; path !is null; path = path.next) {
static if (HasRes) {
static if (WantPtr) {
if (dg(path)) return;
} else {
if (dg(*path)) return;
}
} else {
static if (WantPtr) dg(path); else dg(*path);
}
}
}
}
float width; /// Width of the image.
float height; /// Height of the image.
NSVG.Shape* shapes; /// Linked list of shapes in the image.
/// delegate can accept:
/// NSVG.Shape*
/// const(NSVG.Shape)*
/// ref NSVG.Shape
/// in ref NSVG.Shape
/// delegate can return:
/// void
/// bool (true means `stop`)
void forEachShape(DG) (scope DG dg) inout
if (__traits(compiles, (){ DG xdg; NSVG.Shape s; xdg(&s); }) ||
__traits(compiles, (){ DG xdg; NSVG.Shape s; xdg(s); }))
{
if (dg is null) return;
enum WantPtr = __traits(compiles, (){ DG xdg; NSVG.Shape s; xdg(&s); });
static if (WantPtr) {
enum HasRes = __traits(compiles, (){ DG xdg; NSVG.Shape s; bool res = xdg(&s); });
} else {
enum HasRes = __traits(compiles, (){ DG xdg; NSVG.Shape s; bool res = xdg(s); });
}
static if (__traits(compiles, (){ NSVG.Shape* s = this.shapes; })) {
alias TP = NSVG.Shape*;
} else {
alias TP = const(NSVG.Shape)*;
}
for (TP shape = shapes; shape !is null; shape = shape.next) {
static if (HasRes) {
static if (WantPtr) {
if (dg(shape)) return;
} else {
if (dg(*shape)) return;
}
} else {
static if (WantPtr) dg(shape); else dg(*shape);
}
}
}
}
// ////////////////////////////////////////////////////////////////////////// //
private:
nothrow @trusted @nogc {
// ////////////////////////////////////////////////////////////////////////// //
// sscanf replacement: just enough to replace all our cases
int xsscanf(A...) (const(char)[] str, const(char)[] fmt, ref A args) {
int spos;
while (spos < str.length && str.ptr[spos] <= ' ') ++spos;
static int hexdigit() (char c) {
pragma(inline, true);
return
(c >= '0' && c <= '9' ? c-'0' :
c >= 'A' && c <= 'F' ? c-'A'+10 :
c >= 'a' && c <= 'f' ? c-'a'+10 :
-1);
}
bool parseInt(T : ulong) (ref T res) {
res = 0;
debug(xsscanf_int) { import std.stdio; writeln("parseInt00: str=", str[spos..$].quote); }
bool neg = false;
if (spos < str.length && str.ptr[spos] == '+') ++spos;
else if (spos < str.length && str.ptr[spos] == '-') { neg = true; ++spos; }
if (spos >= str.length || str.ptr[spos] < '0' || str.ptr[spos] > '9') return false;
while (spos < str.length && str.ptr[spos] >= '0' && str.ptr[spos] <= '9') res = res*10+str.ptr[spos++]-'0';
debug(xsscanf_int) { import std.stdio; writeln("parseInt10: str=", str[spos..$].quote); }
if (neg) res = -res;
return true;
}
bool parseHex(T : ulong) (ref T res) {
res = 0;
debug(xsscanf_int) { import std.stdio; writeln("parseHex00: str=", str[spos..$].quote); }
if (spos >= str.length || hexdigit(str.ptr[spos]) < 0) return false;
while (spos < str.length) {
auto d = hexdigit(str.ptr[spos]);
if (d < 0) break;
res = res*16+d;
++spos;
}
debug(xsscanf_int) { import std.stdio; writeln("parseHex10: str=", str[spos..$].quote); }
return true;
}
bool parseFloat(T : real) (ref T res) {
res = 0.0;
debug(xsscanf_float) { import std.stdio; writeln("parseFloat00: str=", str[spos..$].quote); }
bool neg = false;
if (spos < str.length && str.ptr[spos] == '+') ++spos;
else if (spos < str.length && str.ptr[spos] == '-') { neg = true; ++spos; }
bool wasChar = false;
// integer part
debug(xsscanf_float) { import std.stdio; writeln("parseFloat01: str=", str[spos..$].quote); }
if (spos < str.length && str.ptr[spos] >= '0' && str.ptr[spos] <= '9') wasChar = true;
while (spos < str.length && str.ptr[spos] >= '0' && str.ptr[spos] <= '9') res = res*10+str.ptr[spos++]-'0';
// fractional part
if (spos < str.length && str.ptr[spos] == '.') {
debug(xsscanf_float) { import std.stdio; writeln("parseFloat02: str=", str[spos..$].quote); }
T div = 1.0/10;
++spos;
if (spos < str.length && str.ptr[spos] >= '0' && str.ptr[spos] <= '9') wasChar = true;
debug(xsscanf_float) { import std.stdio; writeln("parseFloat03: str=", str[spos..$].quote); }
while (spos < str.length && str.ptr[spos] >= '0' && str.ptr[spos] <= '9') {
res += div*(str.ptr[spos++]-'0');
div /= 10.0;
}
debug(xsscanf_float) { import std.stdio; writeln("parseFloat04: str=", str[spos..$].quote); }
debug(xsscanf_float) { import std.stdio; writeln("div=", div, "; res=", res, "; str=", str[spos..$].quote); }
}
// '[Ee][+-]num' part
if (wasChar && spos < str.length && (str.ptr[spos] == 'E' || str.ptr[spos] == 'e')) {
debug(xsscanf_float) { import std.stdio; writeln("parseFloat05: str=", str[spos..$].quote); }
++spos;
bool xneg = false;
if (spos < str.length && str.ptr[spos] == '+') ++spos;
else if (spos < str.length && str.ptr[spos] == '-') { xneg = true; ++spos; }
int n = 0;
if (spos >= str.length || str.ptr[spos] < '0' || str.ptr[spos] > '9') return false; // number expected
debug(xsscanf_float) { import std.stdio; writeln("parseFloat06: str=", str[spos..$].quote); }
while (spos < str.length && str.ptr[spos] >= '0' && str.ptr[spos] <= '9') n = n*10+str.ptr[spos++]-'0';
if (xneg) {
while (n-- > 0) res /= 10;
} else {
while (n-- > 0) res *= 10;
}
debug(xsscanf_float) { import std.stdio; writeln("parseFloat07: str=", str[spos..$].quote); }
}
if (!wasChar) return false;
debug(xsscanf_float) { import std.stdio; writeln("parseFloat10: str=", str[spos..$].quote); }
if (neg) res = -res;
return true;
}
int fpos;
void skipXSpaces () {
if (fpos < fmt.length && fmt.ptr[fpos] <= ' ') {
while (fpos < fmt.length && fmt.ptr[fpos] <= ' ') ++fpos;
while (spos < str.length && str.ptr[spos] <= ' ') ++spos;
}
}
bool parseImpl(T/*, usize dummy*/) (ref T res) {
while (fpos < fmt.length) {
//{ import std.stdio; writeln("spos=", spos, "; fpos=", fpos, "\nfmt=", fmt[fpos..$].quote, "\nstr=", str[spos..$].quote); }
if (fmt.ptr[fpos] <= ' ') {
skipXSpaces();
continue;
}
if (fmt.ptr[fpos] != '%') {
if (spos >= str.length || str.ptr[spos] != fmt.ptr[spos]) return false;
++spos;
++fpos;
continue;
}
if (fmt.length-fpos < 2) return false; // stray percent
fpos += 2;
bool skipAss = false;
if (fmt.ptr[fpos-1] == '*') {
++fpos;
if (fpos >= fmt.length) return false; // stray star
skipAss = true;
}
switch (fmt.ptr[fpos-1]) {
case '%':
if (spos >= str.length || str.ptr[spos] != '%') return false;
++spos;
break;
case 'd':
static if (is(T : ulong)) {
if (skipAss) {
long v;
if (!parseInt!long(v)) return false;
} else {
return parseInt!T(res);
}
} else {
if (!skipAss) assert(0, "invalid type");
long v;
if (!parseInt!long(v)) return false;
}
break;
case 'x':
static if (is(T : ulong)) {
if (skipAss) {
long v;
if (!parseHex!long(v)) return false;
} else {
return parseHex!T(res);
}
} else {
if (!skipAss) assert(0, "invalid type");
ulong v;
if (!parseHex!ulong(v)) return false;
}
break;
case 'f':
static if (is(T == float) || is(T == double) || is(T == real)) {
if (skipAss) {
double v;
if (!parseFloat!double(v)) return false;
} else {
return parseFloat!T(res);
}
} else {
if (!skipAss) assert(0, "invalid type");
double v;
if (!parseFloat!double(v)) return false;
}
break;
case '[':
if (fmt.length-fpos < 1) return false;
auto stp = spos;
while (spos < str.length) {
bool ok = false;
foreach (immutable cidx, char c; fmt[fpos..$]) {
if (cidx != 0) {
if (c == '-') assert(0, "not yet");
if (c == ']') break;
}
if (c == ' ') {
if (str.ptr[spos] <= ' ') { ok = true; break; }
} else {
if (str.ptr[spos] == c) { ok = true; break; }
}
}
//{ import std.stdio; writeln("** spos=", spos, "; fpos=", fpos, "\nfmt=", fmt[fpos..$].quote, "\nstr=", str[spos..$].quote, "\nok: ", ok); }
if (!ok) break; // not a match
++spos; // skip match
}
++fpos;
while (fpos < fmt.length && fmt[fpos] != ']') ++fpos;
if (fpos < fmt.length) ++fpos;
static if (is(T == const(char)[])) {
if (!skipAss) {
res = str[stp..spos];
return true;
}
} else {
if (!skipAss) assert(0, "invalid type");
}
break;
case 's':
auto stp = spos;
while (spos < str.length && str.ptr[spos] > ' ') ++spos;
static if (is(T == const(char)[])) {
if (!skipAss) {
res = str[stp..spos];
return true;
}
} else {
// skip non-spaces
if (!skipAss) assert(0, "invalid type");
}
break;
default: assert(0, "unknown format specifier");
}
}
return false;
}
foreach (usize aidx, immutable T; A) {
//pragma(msg, "aidx=", aidx, "; T=", T);
if (!parseImpl!(T)(args[aidx])) return -(spos+1);
//{ import std.stdio; writeln("@@@ aidx=", aidx+3, "; spos=", spos, "; fpos=", fpos, "\nfmt=", fmt[fpos..$].quote, "\nstr=", str[spos..$].quote); }
}
skipXSpaces();
return (fpos < fmt.length ? -(spos+1) : spos);
}
// ////////////////////////////////////////////////////////////////////////// //
T* xalloc(T) (usize addmem=0) if (!is(T == class)) {
import core.stdc.stdlib : malloc;
if (T.sizeof == 0 && addmem == 0) addmem = 1;
auto res = cast(ubyte*)malloc(T.sizeof+addmem+256);
if (res is null) assert(0, "NanoVega.SVG: out of memory");
res[0..T.sizeof+addmem] = 0;
return cast(T*)res;
}
T* xcalloc(T) (usize count) if (!is(T == class) && !is(T == struct)) {
import core.stdc.stdlib : malloc;
usize sz = T.sizeof*count;
if (sz == 0) sz = 1;
auto res = cast(ubyte*)malloc(sz+256);
if (res is null) assert(0, "NanoVega.SVG: out of memory");
res[0..sz] = 0;
return cast(T*)res;
}
void xfree(T) (ref T* p) {
if (p !is null) {
import core.stdc.stdlib : free;
free(p);
p = null;
}
}
alias AttrList = const(const(char)[])[];
public enum NSVG_PI = 3.14159265358979323846264338327f; ///
enum NSVG_KAPPA90 = 0.5522847493f; // Lenght proportional to radius of a cubic bezier handle for 90deg arcs.
enum NSVG_ALIGN_MIN = 0;
enum NSVG_ALIGN_MID = 1;
enum NSVG_ALIGN_MAX = 2;
enum NSVG_ALIGN_NONE = 0;
enum NSVG_ALIGN_MEET = 1;
enum NSVG_ALIGN_SLICE = 2;
int nsvg__isspace() (char c) { pragma(inline, true); return (c && c <= ' '); } // because
int nsvg__isdigit() (char c) { pragma(inline, true); return (c >= '0' && c <= '9'); }
int nsvg__isnum() (char c) { pragma(inline, true); return ((c >= '0' && c <= '9') || c == '+' || c == '-' || c == '.' || c == 'e' || c == 'E'); }
int nsvg__hexdigit() (char c) {
pragma(inline, true);
return
(c >= '0' && c <= '9' ? c-'0' :
c >= 'A' && c <= 'F' ? c-'A'+10 :
c >= 'a' && c <= 'f' ? c-'a'+10 :
-1);
}
float nsvg__minf() (float a, float b) { pragma(inline, true); return (a < b ? a : b); }
float nsvg__maxf() (float a, float b) { pragma(inline, true); return (a > b ? a : b); }
// Simple XML parser
enum NSVG_XML_TAG = 1;
enum NSVG_XML_CONTENT = 2;
enum NSVG_XML_MAX_ATTRIBS = 256;
void nsvg__parseContent (const(char)[] s, scope void function (void* ud, const(char)[] s) nothrow @nogc contentCb, void* ud) {
// Trim start white spaces
while (s.length && nsvg__isspace(s[0])) s = s[1..$];
if (s.length == 0) return;
//{ import std.stdio; writeln("s=", s.quote); }
if (contentCb !is null) contentCb(ud, s);
}
static void nsvg__parseElement (const(char)[] s,
scope void function (void* ud, const(char)[] el, AttrList attr) nothrow @nogc startelCb,
scope void function (void* ud, const(char)[] el) nothrow @nogc endelCb,
void* ud)
{
const(char)[][NSVG_XML_MAX_ATTRIBS] attr;
int nattr = 0;
const(char)[] name;
int start = 0;
int end = 0;
char quote;
// Skip white space after the '<'
while (s.length && nsvg__isspace(s[0])) s = s[1..$];
// Check if the tag is end tag
if (s.length && s[0] == '/') {
s = s[1..$];
end = 1;
} else {
start = 1;
}
// Skip comments, data and preprocessor stuff.
if (s.length == 0 || s[0] == '?' || s[0] == '!') return;
// Get tag name
//{ import std.stdio; writeln("bs=", s.quote); }
{
usize pos = 0;
while (pos < s.length && !nsvg__isspace(s[pos])) ++pos;
name = s[0..pos];
s = s[pos..$];
}
//{ import std.stdio; writeln("name=", name.quote); }
//{ import std.stdio; writeln("as=", s.quote); }
// Get attribs
while (!end && s.length && attr.length-nattr >= 2) {
// skip white space before the attrib name
while (s.length && nsvg__isspace(s[0])) s = s[1..$];
if (s.length == 0) break;
if (s[0] == '/') { end = 1; break; }
// find end of the attrib name
{
usize pos = 0;
while (pos < s.length && !nsvg__isspace(s[pos]) && s[pos] != '=') ++pos;
attr[nattr++] = s[0..pos];
s = s[pos..$];
}
// skip until the beginning of the value
while (s.length && s[0] != '\"' && s[0] != '\'') s = s[1..$];
if (s.length == 0) break;
// store value and find the end of it
quote = s[0];
s = s[1..$];
{
usize pos = 0;
while (pos < s.length && s[pos] != quote) ++pos;
attr[nattr++] = s[0..pos];
s = s[pos+(pos < s.length ? 1 : 0)..$];
}
//{ import std.stdio; writeln("n=", attr[nattr-2].quote, "\nv=", attr[nattr-1].quote, "\n"); }
}
debug(nanosvg) {
import std.stdio;
writeln("===========================");
foreach (immutable idx, const(char)[] v; attr[0..nattr]) writeln(" #", idx, ": ", v.quote);
}
// Call callbacks.
if (start && startelCb !is null) startelCb(ud, name, attr[0..nattr]);
if (end && endelCb !is null) endelCb(ud, name);
}
void nsvg__parseXML (const(char)[] input,
scope void function (void* ud, const(char)[] el, AttrList attr) nothrow @nogc startelCb,
scope void function (void* ud, const(char)[] el) nothrow @nogc endelCb,
scope void function (void* ud, const(char)[] s) nothrow @nogc contentCb,
void* ud)
{
usize cpos = 0;
int state = NSVG_XML_CONTENT;
while (cpos < input.length) {
if (state == NSVG_XML_CONTENT && input[cpos] == '<') {
if (input.length-cpos >= 9 && input[cpos..cpos+9] == "<![CDATA[") {
cpos += 9;
while (cpos < input.length) {
if (input.length-cpos > 1 && input.ptr[cpos] == ']' && input.ptr[cpos+1] == ']') {
cpos += 2;
while (cpos < input.length && input.ptr[cpos] <= ' ') ++cpos;
if (cpos < input.length && input.ptr[cpos] == '>') { ++cpos; break; }
} else {
++cpos;
}
}
continue;
}
// start of a tag
//{ import std.stdio; writeln("ctx: ", input[0..cpos].quote); }
////version(nanosvg_debug_styles) { import std.stdio; writeln("ctx: ", input[0..cpos].quote); }
nsvg__parseContent(input[0..cpos], contentCb, ud);
input = input[cpos+1..$];
if (input.length > 2 && input.ptr[0] == '!' && input.ptr[1] == '-' && input.ptr[2] == '-') {
//{ import std.stdio; writeln("ctx0: ", input.quote); }
// skip comments
cpos = 3;
while (cpos < input.length) {
if (input.length-cpos > 2 && input.ptr[cpos] == '-' && input.ptr[cpos+1] == '-' && input.ptr[cpos+2] == '>') {
cpos += 3;
break;
}
++cpos;
}
input = input[cpos..$];
//{ import std.stdio; writeln("ctx1: ", input.quote); }
} else {
state = NSVG_XML_TAG;
}
cpos = 0;
} else if (state == NSVG_XML_TAG && input[cpos] == '>') {
// start of a content or new tag
//{ import std.stdio; writeln("tag: ", input[0..cpos].quote); }
nsvg__parseElement(input[0..cpos], startelCb, endelCb, ud);
input = input[cpos+1..$];
cpos = 0;
state = NSVG_XML_CONTENT;
} else {
++cpos;
}
}
}
/* Simple SVG parser. */
enum NSVG_MAX_ATTR = 128;
enum GradientUnits : ubyte {
User,
Object,
}
enum NSVG_MAX_DASHES = 8;
enum Units : ubyte {
user,
px,
pt,
pc,
mm,
cm,
in_,
percent,
em,
ex,
}
struct Coordinate {
float value;
Units units;
}
struct LinearData {
Coordinate x1, y1, x2, y2;
}
struct RadialData {
Coordinate cx, cy, r, fx, fy;
}
struct GradientData {
char[64] id = 0;
char[64] ref_ = 0;
NSVG.PaintType type;
union {
LinearData linear;
RadialData radial;
}
NSVG.SpreadType spread;