yetangitu/pdf.js
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Refactors Cache into PDFPageViewBuffer

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This commit is contained in:
Yury Delendik 2014-09-29 11:32:45 -05:00
parent 22c62685b0
commit b930228788
3 changed files with 38 additions and 33 deletions
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38
web/pdf_viewer.js
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@ -14,7 +14,7 @@
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*globals watchScroll, Cache, DEFAULT_CACHE_SIZE, PDFPageView, UNKNOWN_SCALE,
/*globals watchScroll, PDFPageView, UNKNOWN_SCALE,
SCROLLBAR_PADDING, VERTICAL_PADDING, MAX_AUTO_SCALE, CSS_UNITS,
DEFAULT_SCALE, scrollIntoView, getVisibleElements, RenderingStates,
PDFJS, Promise, TextLayerBuilder, PDFRenderingQueue,
@ -30,6 +30,7 @@ var PresentationModeState = {
};
var IGNORE_CURRENT_POSITION_ON_ZOOM = false;
var DEFAULT_CACHE_SIZE = 10;
//#include pdf_rendering_queue.js
//#include pdf_page_view.js
@ -52,6 +53,26 @@ var IGNORE_CURRENT_POSITION_ON_ZOOM = false;
* @implements {IRenderableView}
*/
var PDFViewer = (function pdfViewer() {
function PDFPageViewBuffer(size) {
var data = [];
this.push = function cachePush(view) {
var i = data.indexOf(view);
if (i >= 0) {
data.splice(i, 1);
}
data.push(view);
if (data.length > size) {
data.shift().destroy();
}
};
this.resize = function (newSize) {
size = newSize;
while (data.length > size) {
data.shift().destroy();
}
};
}
/**
* @constructs PDFViewer
* @param {PDFViewerOptions} options
@ -212,7 +233,13 @@ var PDFViewer = (function pdfViewer() {
});
this.onePageRendered = onePageRendered;
var bindOnAfterDraw = function (pageView) {
var bindOnAfterAndBeforeDraw = function (pageView) {
pageView.onBeforeDraw = function pdfViewLoadOnBeforeDraw() {
// Add the page to the buffer at the start of drawing. That way it can
// be evicted from the buffer and destroyed even if we pause its
// rendering.
self._buffer.push(this);
};
// when page is painted, using the image as thumbnail base
pageView.onAfterDraw = function pdfViewLoadOnAfterDraw() {
if (!isOnePageRenderedResolved) {
@ -246,11 +273,10 @@ var PDFViewer = (function pdfViewer() {
scale: scale,
defaultViewport: viewport.clone(),
renderingQueue: this.renderingQueue,
cache: this.cache,
textLayerFactory: textLayerFactory,
annotationsLayerFactory: this
});
bindOnAfterDraw(pageView);
bindOnAfterAndBeforeDraw(pageView);
this.pages.push(pageView);
}
@ -291,11 +317,11 @@ var PDFViewer = (function pdfViewer() {
},
_resetView: function () {
this.cache = new Cache(DEFAULT_CACHE_SIZE);
this.pages = [];
this._currentPageNumber = 1;
this._currentScale = UNKNOWN_SCALE;
this._currentScaleValue = null;
this._buffer = new PDFPageViewBuffer(DEFAULT_CACHE_SIZE);
this.location = null;
this._pagesRotation = 0;
this._pagesRequests = [];
@ -538,7 +564,7 @@ var PDFViewer = (function pdfViewer() {
var suggestedCacheSize = Math.max(DEFAULT_CACHE_SIZE,
2 * visiblePages.length + 1);
this.cache.resize(suggestedCacheSize);
this._buffer.resize(suggestedCacheSize);
this.renderingQueue.renderHighestPriority(visible);