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Resets canvas 2d context to the default state.

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This commit is contained in:
Yury Delendik 2017-05-23 10:57:26 -05:00
parent f2161345e3
commit a67198895f
3 changed files with 30 additions and 5 deletions
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26
src/display/canvas.js
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@ -354,7 +354,7 @@ function compileType3Glyph(imgData) {
}
var CanvasExtraState = (function CanvasExtraStateClosure() {
function CanvasExtraState(old) {
function CanvasExtraState() {
// Are soft masks and alpha values shapes or opacities?
this.alphaIsShape = false;
this.fontSize = 0;
@ -385,8 +385,6 @@ var CanvasExtraState = (function CanvasExtraStateClosure() {
this.lineWidth = 1;
this.activeSMask = null;
this.resumeSMaskCtx = null; // nonclonable field (see the save method below)
this.old = old;
}
CanvasExtraState.prototype = {
@ -609,6 +607,23 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
}
}
function resetCtxToDefault(ctx) {
ctx.strokeStyle = '#000000';
ctx.fillStyle = '#000000';
ctx.fillRule = 'nonzero';
ctx.globalAlpha = 1;
ctx.lineWidth = 1;
ctx.lineCap = 'butt';
ctx.lineJoin = 'miter';
ctx.miterLimit = 10;
ctx.globalCompositeOperation = 'source-over';
ctx.font = '10px sans-serif';
if (ctx.setLineDash !== undefined) {
ctx.setLineDash([]);
ctx.lineDashOffset = 0;
}
}
function composeSMaskBackdrop(bytes, r0, g0, b0) {
var length = bytes.length;
for (var i = 3; i < length; i += 4) {
@ -734,6 +749,7 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
}
this.ctx.save();
resetCtxToDefault(this.ctx);
if (transform) {
this.ctx.transform.apply(this.ctx, transform);
}
@ -1863,8 +1879,6 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
beginAnnotations: function CanvasGraphics_beginAnnotations() {
this.save();
this.current = new CanvasExtraState();
if (this.baseTransform) {
this.ctx.setTransform.apply(this.ctx, this.baseTransform);
}
@ -1877,6 +1891,8 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
beginAnnotation: function CanvasGraphics_beginAnnotation(rect, transform,
matrix) {
this.save();
resetCtxToDefault(this.ctx);
this.current = new CanvasExtraState();
if (isArray(rect) && rect.length === 4) {
var width = rect[2] - rect[0];