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Use white backdrop when possible.

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This commit is contained in:
Brendan Dahl 2013-03-29 13:26:25 -07:00
parent 04f6e17e11
commit ec311f303b
5 changed files with 32 additions and 12 deletions
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18
src/canvas.js
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@ -415,7 +415,23 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
'shadingFill': true
},
beginDrawing: function CanvasGraphics_beginDrawing(viewport) {
beginDrawing: function CanvasGraphics_beginDrawing(viewport, transparency) {
// For pdfs that use blend modes we have to clear the canvas else certain
// blend modes can look wrong since we'd be blending with a white
// backdrop. The problem with a transparent backdrop though is we then
// don't get sub pixel anti aliasing on text, so we fill with white if
// we can.
var width = this.ctx.canvas.width;
var height = this.ctx.canvas.height;
if (transparency) {
this.ctx.clearRect(0, 0, width, height);
} else {
this.ctx.save();
this.ctx.fillStyle = 'rgb(255, 255, 255)';
this.ctx.fillRect(0, 0, width, height);
this.ctx.restore();
}
var transform = viewport.transform;
this.ctx.save();
this.ctx.transform.apply(this.ctx, transform);