Sakurai/pdf.js
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This commit is contained in:
Artur Adib 2011-11-29 16:02:12 -05:00
parent 6a747c4353
commit e2e2240a22
1 changed files with 19 additions and 20 deletions
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39
src/canvas.js
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@ -280,29 +280,28 @@ var CanvasGraphics = (function canvasGraphics() {
var textLayer = this.textLayer; var textLayer = this.textLayer;
if (textLayer) { if (textLayer) {
var renderTextLayer = function canvasRenderTextLayer() { var renderTextLayer = function canvasRenderTextLayer() {
var textDivs = self.textDivs; var textDivs = self.textDivs;
for (var i = 0, length = textDivs.length; i < length; ++i) { for (var i = 0, length = textDivs.length; i < length; ++i) {
if (textDivs[i].dataset.textLength>1) { // avoid div by zero if (textDivs[i].dataset.textLength > 1) { // avoid div by zero
textLayer.appendChild(textDivs[i]); textLayer.appendChild(textDivs[i]);
// Adjust div width (via letterSpacing) to match canvas text // Adjust div width (via letterSpacing) to match canvas text
// Due to the .offsetWidth calls, this is slow // Due to the .offsetWidth calls, this is slow
textDivs[i].style.letterSpacing = textDivs[i].style.letterSpacing =
((textDivs[i].dataset.canvasWidth ((textDivs[i].dataset.canvasWidth - textDivs[i].offsetWidth) /
- textDivs[i].offsetWidth)/(textDivs[i].dataset.textLength-1)) (textDivs[i].dataset.textLength - 1)) + 'px';
+ 'px';
} }
} }
} }
var textLayerQueue = self.textLayerQueue; var textLayerQueue = self.textLayerQueue;
textLayerQueue.push(renderTextLayer); textLayerQueue.push(renderTextLayer);
// Lazy textLayer rendering (to prevent UI hangs) // Lazy textLayer rendering (to prevent UI hangs)
// Only render queue if activity has stopped, where "no activity" == // Only render queue if activity has stopped, where "no activity" ==
// "no beginDrawing() calls in the last N ms" // "no beginDrawing() calls in the last N ms"
self.textLayerTimer = setTimeout(function renderTextLayerQueue(){ self.textLayerTimer = setTimeout(function renderTextLayerQueue() {
// Render most recent (==most relevant) layers first // Render most recent (==most relevant) layers first
for (var i=textLayerQueue.length-1; i>=0; i--) { for (var i = textLayerQueue.length - 1; i >= 0; i--) {
textLayerQueue.pop().call(); textLayerQueue.pop().call();
} }
}, 500); }, 500);
@ -596,7 +595,7 @@ var CanvasGraphics = (function canvasGraphics() {
spaceGlyph = font.charsToGlyphs('i'); spaceGlyph = font.charsToGlyphs('i');
// Fallback // Fallback
if (spaceGlyph.length === 0 || spaceGlyph[0].width === 0) if (spaceGlyph.length === 0 || spaceGlyph[0].width === 0)
spaceGlyph = [ {width:0} ]; spaceGlyph = [{width: 0}];
geom.spaceWidth = spaceGlyph[0].width; geom.spaceWidth = spaceGlyph[0].width;
return geom; return geom;
}, },
@ -629,7 +628,7 @@ var CanvasGraphics = (function canvasGraphics() {
var textHScale = current.textHScale; var textHScale = current.textHScale;
var glyphsLength = glyphs.length; var glyphsLength = glyphs.length;
var textLayer = this.textLayer; var textLayer = this.textLayer;
var text = { str:'', length:0, canvasWidth:0, geom:{}}; var text = {str: '', length: 0, canvasWidth: 0, geom: {}};
var textSelection = textLayer && !skipTextSelection ? true : false; var textSelection = textLayer && !skipTextSelection ? true : false;
if (textSelection) { if (textSelection) {
@ -638,7 +637,7 @@ var CanvasGraphics = (function canvasGraphics() {
text.geom = this.getTextGeometry(); text.geom = this.getTextGeometry();
ctx.restore(); ctx.restore();
} }
// Type3 fonts - each glyph is a "mini-PDF" // Type3 fonts - each glyph is a "mini-PDF"
if (font.coded) { if (font.coded) {
ctx.save(); ctx.save();
@ -689,7 +688,7 @@ var CanvasGraphics = (function canvasGraphics() {
var charWidth = glyph.width * fontSize * 0.001 + charSpacing; var charWidth = glyph.width * fontSize * 0.001 + charSpacing;
ctx.fillText(char, width, 0); ctx.fillText(char, width, 0);
width += charWidth; width += charWidth;
text.str += char === ' ' ? '&nbsp;' : char; text.str += char === ' ' ? '&nbsp;' : char;
text.length++; text.length++;
text.canvasWidth += charWidth; text.canvasWidth += charWidth;
@ -699,7 +698,7 @@ var CanvasGraphics = (function canvasGraphics() {
ctx.restore(); ctx.restore();
} }
if (textSelection) if (textSelection)
this.pushTextDivs(text); this.pushTextDivs(text);
return text; return text;
@ -712,7 +711,7 @@ var CanvasGraphics = (function canvasGraphics() {
var arrLength = arr.length; var arrLength = arr.length;
var textLayer = this.textLayer; var textLayer = this.textLayer;
var font = current.font; var font = current.font;
var text = {str:'', length:0, canvasWidth:0, geom:{}}; var text = {str: '', length: 0, canvasWidth: 0, geom: {}};
var textSelection = textLayer ? true : false; var textSelection = textLayer ? true : false;
if (textSelection) { if (textSelection) {
@ -721,7 +720,7 @@ var CanvasGraphics = (function canvasGraphics() {
text.geom = this.getTextGeometry(); text.geom = this.getTextGeometry();
ctx.restore(); ctx.restore();
} }
for (var i = 0; i < arrLength; ++i) { for (var i = 0; i < arrLength; ++i) {
var e = arr[i]; var e = arr[i];
if (isNum(e)) { if (isNum(e)) {
@ -731,11 +730,11 @@ var CanvasGraphics = (function canvasGraphics() {
if (textSelection) { if (textSelection) {
// Emulate precise spacing via HTML spaces // Emulate precise spacing via HTML spaces
text.canvasWidth += spacingLength; text.canvasWidth += spacingLength;
if (e<0 && text.geom.spaceWidth>0) { // avoid div by zero if (e < 0 && text.geom.spaceWidth > 0) { // avoid div by zero
var numFakeSpaces = Math.round(-e / text.geom.spaceWidth); var numFakeSpaces = Math.round(-e / text.geom.spaceWidth);
for (var j = 0; j < numFakeSpaces; ++j) for (var j = 0; j < numFakeSpaces; ++j)
text.str += '&nbsp;'; text.str += '&nbsp;';
text.length += numFakeSpaces>0 ? 1 : 0; text.length += numFakeSpaces > 0 ? 1 : 0;
} }
} }
} else if (isString(e)) { } else if (isString(e)) {
@ -754,8 +753,8 @@ var CanvasGraphics = (function canvasGraphics() {
malformed('TJ array element ' + e + ' is not string or num'); malformed('TJ array element ' + e + ' is not string or num');
} }
} }
if (textSelection) if (textSelection)
this.pushTextDivs(text); this.pushTextDivs(text);
}, },
nextLineShowText: function canvasGraphicsNextLineShowText(text) { nextLineShowText: function canvasGraphicsNextLineShowText(text) {