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Reader.hx
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Reader.hx
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package hxd.fmt.grd;
import hxd.fmt.grd.Data;
// http://www.tonton-pixel.com/Photoshop%20Additional%20File%20Formats/gradients-file-format.html
class Reader {
var i : haxe.io.Input;
var version : Int;
public function new(i) {
this.i = i;
i.bigEndian = true;
}
function readUnicode(input : haxe.io.Input, len : Int) : String {
var res = "";
for (i in 0...len - 1) res += String.fromCharCode(input.readInt16());
input.readInt16();
return res;
}
function parseValue(i : haxe.io.Input) : Dynamic {
var type = i.readString(4);
var value : Dynamic;
switch (type) {
case "Objc" : value = parseObj (i);
case "VlLs" : value = parseList(i);
case "doub" : value = i.readDouble();
case "UntF" : i.readString(4); value = i.readDouble();
case "TEXT" : value = readUnicode(i, i.readInt32());
case "enum" : value = parseEnum(i);
case "long" : value = i.readInt32();
case "bool" : value = i.readByte();
case "tdtd" : var len = i.readInt32(); value = { length : len, value : i.read(len) };
default : throw "Unhandled type \"" + type + "\"";
}
return value;
}
function parseObj(i : haxe.io.Input) : Dynamic {
var len = i.readInt32(); if (len == 0) len = 4;
var name = readUnicode(i, len);
len = i.readInt32(); if (len == 0) len = 4;
var type = i.readString(len);
var obj = { name : name, type : type }
var numProperties = i.readInt32();
for (pi in 0...numProperties) {
len = i.readInt32(); if (len == 0) len = 4;
var key = i.readString(len);
var si = key.indexOf(" ");
if (si > 0) key = key.substring(0, si);
Reflect.setField(obj, key, parseValue(i));
}
return obj;
}
function parseList(i : haxe.io.Input) {
var res = new Array<Dynamic>();
var len = i.readInt32();
for (li in 0...len)
res.push(parseValue(i));
return res;
}
function parseEnum(i : haxe.io.Input) {
var len = i.readInt32(); if (len == 0) len = 4;
var type = i.readString(len);
len = i.readInt32(); if (len == 0) len = 4;
var value = i.readString(len);
return { type : type, value : value };
}
public function read() : Data {
var d = new Data();
i.read(32); // skip header
i.readString(4); // main object
var list = cast(parseValue(i), Array<Dynamic>);
for (obj in list) {
var obj = obj.Grad;
var grd = new Gradient();
var nm : String = obj.Nm;
grd.name = nm.substring(nm.indexOf("=") + 1);
grd.interpolation = obj.Intr;
createColorStops (obj.Clrs, grd.colorStops);
createTransparencyStops (obj.Trns, grd.transparencyStops);
createGradientStops (grd.colorStops, grd.transparencyStops, grd.gradientStops);
d.set(grd.name, grd);
}
return d;
}
function createColorStops(list : Array<Dynamic>, out : Array<ColorStop>) {
for (e in list) {
var color = Color.RGB(0, 0, 0);
var type : ColorStopType;
switch(e.Type.value) {
case "UsrS" : type = User;
case "BckC" : type = Background;
case "FrgC" : type = Foreground;
default : throw "unhalndled color stop type : " + e.Type.value;
}
if (type == User) {
switch(e.Clr.type) {
case "RGBC" : color = Color.RGB(e.Clr.Rd, e.Clr.Grn, e.Clr.Bl);
case "HSBC" : color = Color.HSB(e.Clr.H, e.Clr.Strt, e.Clr.Brgh);
default : //throw "unhandled color type : " + e.Clr.type;
}
}
var stop = new ColorStop();
stop.color = color;
stop.location = e.Lctn;
stop.midpoint = e.Mdpn;
stop.type = type;
out.push(stop);
}
}
function createTransparencyStops(list : Array<Dynamic>, out : Array<TransparencyStop>) {
for (e in list) {
var stop = new TransparencyStop();
stop.opacity = e.Opct;
stop.location = e.Lctn;
stop.midpoint = e.Mdpn;
out.push(stop);
}
}
function createGradientStops(
clrs : Array<ColorStop>,
trns : Array<TransparencyStop>,
out : Array<GradientStop>) {
for (clr in clrs) {
var stop = new GradientStop();
stop.opacity = getOpacity(clr, trns);
stop.colorStop = clr;
out.push(stop);
}
}
function getOpacity(clr : ColorStop, trns : Array<TransparencyStop>) {
var index = -1;
for (i in 0...trns.length) {
var t = trns[i];
if (t.location >= clr.location) {
index = i;
break;
}
}
if (index == 0) return trns[0].opacity;
if (index < 0) return trns[trns.length - 1].opacity;
var prev = trns[index - 1];
var next = trns[index];
var w = next.location - prev.location;
var h = next.opacity - prev.opacity;
if (w == 0) return prev.opacity;
var m = h / w;
var b = prev.opacity - (m * prev.location);
return m * clr.location + b;
}
}