Sakurai/pdf.js
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cleaned up fetchIfRef, changed switch-case to array lookup, changed IsFunction to IsPDFFunction

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This commit is contained in:
sbarman 2011-06-15 11:34:47 -07:00
parent b7360823a2
commit 0f2d4c7011
1 changed files with 31 additions and 47 deletions
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78
pdf.js
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@ -617,7 +617,7 @@ function IsRef(v) {
return v instanceof Ref;
}
function IsFunction(v) {
function IsPDFFunction(v) {
var fnDict;
if (typeof v != "object")
return false;
@ -1911,18 +1911,16 @@ var CanvasGraphics = (function() {
// Shading
shadingFill: function(entryRef) {
var shadingRes = this.res.get("Shading");
if (!shadingRes)
return;
var xref = this.xref;
shadingRes = xref.fetchIfRef(shadingRes);
var shading = shadingRes.get(entryRef.name);
var res = this.res;
var shadingRes = xref.fetchIfRef(res.get("Shading"));
if (!shadingRes)
error("No shading resource found");
var shading = xref.fetchIfRef(shadingRes.get(entryRef.name));
if (!shading)
return;
shading = xref.fetchIfRef(shading);
if (!shading)
return;
error("No shading object found");
this.save();
@ -1940,22 +1938,14 @@ var CanvasGraphics = (function() {
if (background)
TODO("handle background colors");
var type = shading.get("ShadingType");
switch (type) {
case 1:
this.fillFunctionShading(shading);
break;
case 2:
this.fillAxialShading(shading);
break;
case 3:
this.fillRadialShading(shading);
break;
case 4: case 5: case 6: case 7:
TODO("shading fill type "+ type);
default:
malformed("Unknown shading type "+ type);
}
const types = [null, this.fillFunctionShading,
this.fillAxialShading, this.fillRadialShading];
var typeNum = shading.get("ShadingType");
var fillFn = types[typeNum];
if (!fillFn)
error("Unknown type of shading");
fillFn.apply(this, [shading]);
this.restore();
},
@ -1981,7 +1971,7 @@ var CanvasGraphics = (function() {
fnObj = this.xref.fetchIfRef(fnObj);
if (IsArray(fnObj))
error("No support for array of functions");
else if (!IsFunction(fnObj))
else if (!IsPDFFunction(fnObj))
error("Invalid function");
fn = new PDFFunction(this.xref, fnObj);
@ -1990,12 +1980,14 @@ var CanvasGraphics = (function() {
for (var i = t0; i <= t1; i += step) {
var c = fn.func([i]);
gradient.addColorStop(i, this.makeCssRgb.apply(this,c));
gradient.addColorStop(i, this.makeCssRgb.apply(this, c));
}
this.ctx.fillStyle = gradient;
// HACK to draw the gradient onto an infinite rectangle
// HACK to draw the gradient onto an infinite rectangle.
// PDF gradients are drawn across the entire image while
// Canvas only allows gradients to be drawn in a rectangle
this.ctx.fillRect(-1e10, -1e10, 2e10, 2e10);
},
@ -2316,24 +2308,16 @@ var PDFFunction = (function() {
if (!dict)
dict = fn;
var type = dict.get("FunctionType");
switch(type) {
case 0:
this.constructSampled(fn, dict);
break;
case 2:
this.constructInterpolated();
break;
case 3:
this.constructStiched();
break;
case 4:
this.constructPostScript();
break;
default:
const types = [this.constructSampled, null,
this.constructInterpolated, this.constructStiched,
this.constructPostScript];
var typeNum = dict.get("FunctionType");
var typeFn = types[typeNum];
if (!typeFn)
error("Unknown type of function");
}
typeFn.apply(this, [fn, dict]);
};
constructor.prototype = {