ZenBrowserMirrors/pdf.js
1
0
Fork 0
mirror of https://github.com/zen-browser/pdf.js.git synced 2025-07-10 10:15:37 +02:00
Code Issues Projects Releases Packages Wiki Activity Actions

Build the text layer geometry on the worker.

Browse source
This commit is contained in:
Brendan Dahl 2014-04-09 16:44:07 -07:00
parent af536353d5
commit 5bd8a83c9b
10 changed files with 404 additions and 416 deletions
Download patch file Download diff file Expand all files Collapse all files

109
src/display/canvas.js
View file

@ -402,7 +402,7 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
// before it stops and shedules a continue of execution.
var EXECUTION_TIME = 15;
function CanvasGraphics(canvasCtx, commonObjs, objs, textLayer, imageLayer) {
function CanvasGraphics(canvasCtx, commonObjs, objs, imageLayer) {
this.ctx = canvasCtx;
this.current = new CanvasExtraState();
this.stateStack = [];
@ -412,7 +412,6 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
this.xobjs = null;
this.commonObjs = commonObjs;
this.objs = objs;
this.textLayer = textLayer;
this.imageLayer = imageLayer;
this.groupStack = [];
this.processingType3 = null;
@ -718,9 +717,6 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
this.baseTransform = this.ctx.mozCurrentTransform.slice();
if (this.textLayer) {
this.textLayer.beginLayout();
}
if (this.imageLayer) {
this.imageLayer.beginLayout();
}
@ -802,9 +798,6 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
CachedCanvases.clear();
WebGLUtils.clear();
if (this.textLayer) {
this.textLayer.endLayout();
}
if (this.imageLayer) {
this.imageLayer.endLayout();
}
@ -1234,33 +1227,6 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
ctx.scale(-current.textHScale, 1);
}
},
createTextGeometry: function CanvasGraphics_createTextGeometry() {
var geometry = {};
var ctx = this.ctx;
var font = this.current.font;
var ctxMatrix = ctx.mozCurrentTransform;
var a = ctxMatrix[0], b = ctxMatrix[1], c = ctxMatrix[2];
var d = ctxMatrix[3], e = ctxMatrix[4], f = ctxMatrix[5];
var sx = (a >= 0) ?
Math.sqrt((a * a) + (b * b)) : -Math.sqrt((a * a) + (b * b));
var sy = (d >= 0) ?
Math.sqrt((c * c) + (d * d)) : -Math.sqrt((c * c) + (d * d));
var angle = Math.atan2(b, a);
var x = e;
var y = f;
geometry.x = x;
geometry.y = y;
geometry.hScale = sx;
geometry.vScale = sy;
geometry.angle = angle;
geometry.spaceWidth = font.spaceWidth;
geometry.fontName = font.loadedName;
geometry.fontFamily = font.fallbackName;
geometry.fontSize = this.current.fontSize;
geometry.ascent = font.ascent;
geometry.descent = font.descent;
return geometry;
},
paintChar: function (character, x, y) {
var ctx = this.ctx;
@ -1332,7 +1298,7 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
return shadow(this, 'isFontSubpixelAAEnabled', enabled);
},
showText: function CanvasGraphics_showText(glyphs, skipTextSelection) {
showText: function CanvasGraphics_showText(glyphs) {
var ctx = this.ctx;
var current = this.current;
var font = current.font;
@ -1343,24 +1309,11 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
var textHScale = current.textHScale * current.fontDirection;
var fontMatrix = current.fontMatrix || FONT_IDENTITY_MATRIX;
var glyphsLength = glyphs.length;
var textLayer = this.textLayer;
var geom;
var textSelection = textLayer && !skipTextSelection ? true : false;
var canvasWidth = 0.0;
var vertical = font.vertical;
var defaultVMetrics = font.defaultVMetrics;
if (fontSize === 0) {
if (textSelection) {
geom = this.createTextGeometry();
geom.canvasWidth = canvasWidth;
if (vertical) {
var VERTICAL_TEXT_ROTATION = Math.PI / 2;
geom.angle += VERTICAL_TEXT_ROTATION;
}
this.textLayer.appendText(geom);
}
return canvasWidth;
return;
}
// Type3 fonts - each glyph is a "mini-PDF"
@ -1371,12 +1324,6 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
ctx.scale(textHScale, 1);
if (textSelection) {
this.save();
ctx.scale(1, -1);
geom = this.createTextGeometry();
this.restore();
}
for (var i = 0; i < glyphsLength; ++i) {
var glyph = glyphs[i];
@ -1400,8 +1347,6 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
ctx.translate(width, 0);
current.x += width * textHScale;
canvasWidth += width;
}
ctx.restore();
this.processingType3 = null;
@ -1418,10 +1363,6 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
lineWidth /= scale;
}
if (textSelection) {
geom = this.createTextGeometry();
}
if (fontSizeScale != 1.0) {
ctx.scale(fontSizeScale, fontSizeScale);
lineWidth /= fontSizeScale;
@ -1485,8 +1426,6 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
x += charWidth;
canvasWidth += charWidth;
if (restoreNeeded) {
ctx.restore();
}
@ -1498,17 +1437,6 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
}
ctx.restore();
}
if (textSelection) {
geom.canvasWidth = canvasWidth;
if (vertical) {
var VERTICAL_TEXT_ROTATION = Math.PI / 2;
geom.angle += VERTICAL_TEXT_ROTATION;
}
this.textLayer.appendText(geom);
}
return canvasWidth;
},
showSpacedText: function CanvasGraphics_showSpacedText(arr) {
var ctx = this.ctx;
@ -1518,19 +1446,7 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
// TJ array's number is independent from fontMatrix
var textHScale = current.textHScale * 0.001 * current.fontDirection;
var arrLength = arr.length;
var textLayer = this.textLayer;
var geom;
var canvasWidth = 0.0;
var textSelection = textLayer ? true : false;
var vertical = font.vertical;
var spacingAccumulator = 0;
if (textSelection) {
ctx.save();
this.applyTextTransforms();
geom = this.createTextGeometry();
ctx.restore();
}
for (var i = 0; i < arrLength; ++i) {
var e = arr[i];
@ -1542,27 +1458,10 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
current.x += spacingLength;
}
if (textSelection) {
spacingAccumulator += spacingLength;
}
} else {
var shownCanvasWidth = this.showText(e, true);
if (textSelection) {
canvasWidth += spacingAccumulator + shownCanvasWidth;
spacingAccumulator = 0;
}
this.showText(e);
}
}
if (textSelection) {
geom.canvasWidth = canvasWidth;
if (vertical) {
var VERTICAL_TEXT_ROTATION = Math.PI / 2;
geom.angle += VERTICAL_TEXT_ROTATION;
}
this.textLayer.appendText(geom);
}
},
nextLineShowText: function CanvasGraphics_nextLineShowText(text) {
this.nextLine();