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Refactors font matrix operations

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This commit is contained in:
Yury Delendik 2013-01-03 18:39:06 -06:00
parent ccfa0e1972
commit 10bb6c9ec0
3 changed files with 54 additions and 56 deletions
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65
src/canvas.js
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@ -159,7 +159,7 @@ var CanvasExtraState = (function CanvasExtraStateClosure() {
this.fontSize = 0;
this.fontSizeScale = 1;
this.textMatrix = IDENTITY_MATRIX;
this.fontMatrix = IDENTITY_MATRIX;
this.fontMatrix = FONT_IDENTITY_MATRIX;
this.leading = 0;
// Current point (in user coordinates)
this.x = 0;
@ -716,11 +716,8 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
if (!fontObj)
error('Can\'t find font for ' + fontRefName);
// Slice-clone matrix so we can manipulate it without affecting original
if (fontObj.fontMatrix)
current.fontMatrix = fontObj.fontMatrix.slice(0);
else
current.fontMatrix = IDENTITY_MATRIX.slice(0);
current.fontMatrix = fontObj.fontMatrix ? fontObj.fontMatrix :
FONT_IDENTITY_MATRIX;
// A valid matrix needs all main diagonal elements to be non-zero
// This also ensures we bypass FF bugzilla bug #719844.
@ -731,11 +728,11 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
// The spec for Tf (setFont) says that 'size' specifies the font 'scale',
// and in some docs this can be negative (inverted x-y axes).
// We implement this condition with fontMatrix.
if (size < 0) {
size = -size;
current.fontMatrix[0] *= -1;
current.fontMatrix[3] *= -1;
current.fontDirection = -1;
} else {
current.fontDirection = 1;
}
this.current.font = fontObj;
@ -788,14 +785,13 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
applyTextTransforms: function CanvasGraphics_applyTextTransforms() {
var ctx = this.ctx;
var current = this.current;
var textHScale = current.textHScale;
var fontMatrix = current.fontMatrix || IDENTITY_MATRIX;
ctx.transform.apply(ctx, current.textMatrix);
ctx.scale(1, -1);
ctx.translate(current.x, -current.y - current.textRise);
ctx.transform.apply(ctx, fontMatrix);
ctx.scale(textHScale, 1);
ctx.translate(current.x, current.y + current.textRise);
if (current.fontDirection > 0) {
ctx.scale(current.textHScale, -1);
} else {
ctx.scale(-current.textHScale, 1);
}
},
createTextGeometry: function CanvasGraphics_createTextGeometry() {
var geometry = {};
@ -826,9 +822,8 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
var fontSizeScale = current.fontSizeScale;
var charSpacing = current.charSpacing;
var wordSpacing = current.wordSpacing;
var textHScale = current.textHScale;
var fontMatrix = current.fontMatrix || IDENTITY_MATRIX;
var textHScale2 = textHScale * fontMatrix[0];
var textHScale = current.textHScale * current.fontDirection;
var fontMatrix = current.fontMatrix || FONT_IDENTITY_MATRIX;
var glyphsLength = glyphs.length;
var textLayer = this.textLayer;
var geom;
@ -867,8 +862,8 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
this.restore();
var transformed = Util.applyTransform([glyph.width, 0], fontMatrix);
var width = transformed[0] * fontSize +
Util.sign(current.fontMatrix[0]) * charSpacing;
var width = (transformed[0] * fontSize + charSpacing) *
current.fontDirection;
ctx.translate(width, 0);
current.x += width * textHScale;
@ -882,8 +877,7 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
var lineWidth = current.lineWidth;
var a1 = current.textMatrix[0], b1 = current.textMatrix[1];
var a2 = fontMatrix[0], b2 = fontMatrix[1];
var scale = Math.sqrt((a1 * a1 + b1 * b1) * (a2 * a2 + b2 * b2));
var scale = Math.sqrt(a1 * a1 + b1 * b1);
if (scale == 0 || lineWidth == 0)
lineWidth = this.getSinglePixelWidth();
else
@ -904,13 +898,13 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
var glyph = glyphs[i];
if (glyph === null) {
// word break
x += Util.sign(current.fontMatrix[0]) * wordSpacing;
x += current.fontDirection * wordSpacing;
continue;
}
var character = glyph.fontChar;
var charWidth = glyph.width * fontSize * 0.001 +
Util.sign(current.fontMatrix[0]) * charSpacing;
var charWidth = glyph.width * fontSize * current.fontMatrix[0] +
charSpacing * current.fontDirection;
if (!glyph.disabled) {
var scaledX = x / fontSizeScale;
@ -943,7 +937,7 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
canvasWidth += charWidth;
}
current.x += x * textHScale2;
current.x += x * textHScale;
ctx.restore();
}
@ -959,9 +953,9 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
var current = this.current;
var font = current.font;
var fontSize = current.fontSize;
var textHScale = current.textHScale;
if (!font.coded)
textHScale *= (current.fontMatrix || IDENTITY_MATRIX)[0];
var textHScale = current.textHScale * (current.fontMatrix && !font.coded ?
current.fontMatrix[0] : FONT_IDENTITY_MATRIX[0]) *
current.fontDirection;
var arrLength = arr.length;
var textLayer = this.textLayer;
var geom;
@ -970,14 +964,7 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
if (textSelection) {
ctx.save();
// Type3 fonts - each glyph is a "mini-PDF" (see also showText)
if (font.coded) {
ctx.transform.apply(ctx, current.textMatrix);
ctx.scale(1, -1);
ctx.translate(current.x, -1 * current.y);
ctx.scale(textHScale, 1);
} else
this.applyTextTransforms();
this.applyTextTransforms();
geom = this.createTextGeometry();
ctx.restore();
}
@ -985,7 +972,7 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
for (var i = 0; i < arrLength; ++i) {
var e = arr[i];
if (isNum(e)) {
var spacingLength = -e * 0.001 * fontSize * textHScale;
var spacingLength = -e * fontSize * textHScale;
current.x += spacingLength;
if (textSelection)