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Add support for blend modes.

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This commit is contained in:
Brendan Dahl 2013-03-11 10:23:47 -07:00
parent c11a8a6e42
commit 523aa9c152
4 changed files with 24 additions and 5 deletions
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16
src/canvas.js
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@ -561,6 +561,22 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
this.current.fillAlpha = state[1];
this.ctx.globalAlpha = state[1];
break;
case 'BM':
if (value && value.name && (value.name !== 'Normal')) {
var mode = value.name.replace(/([A-Z])/g,
function(c) {
return '-' + c.toLowerCase();
}
).substring(1);
this.ctx.globalCompositeOperation = mode;
if (this.ctx.globalCompositeOperation !== mode) {
warn('globalCompositeOperation "' + mode +
'" is not supported');
}
} else {
this.ctx.globalCompositeOperation = 'source-over';
}
break;
}
}
},

6
src/evaluator.js
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@ -497,6 +497,7 @@ var PartialEvaluator = (function PartialEvaluatorClosure() {
case 'FL':
case 'CA':
case 'ca':
case 'BM':
gsStateObj.push([key, value]);
break;
case 'Font':
@ -506,11 +507,6 @@ var PartialEvaluator = (function PartialEvaluatorClosure() {
value[1]
]);
break;
case 'BM':
// We support the default so don't trigger the TODO.
if (!isName(value) || value.name != 'Normal')
TODO('graphic state operator ' + key);
break;
case 'SMask':
// We support the default so don't trigger the TODO.
if (!isName(value) || value.name != 'None')