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Text rendering refactoring

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This commit is contained in:
Niklas von Hertzen 2012-11-25 23:26:18 +02:00
parent 44023015b6
commit c6baabc99c
1 changed files with 47 additions and 44 deletions
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117
src/Parse.js
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@ -200,51 +200,19 @@ _html2canvas.Parse = function ( images, options ) {
}
function drawText(currentText, x, y, ctx){
if (trimText(currentText).length > 0) {
if (currentText !== null && trimText(currentText).length > 0) {
ctx.fillText(currentText, x, y);
numDraws+=1;
}
}
function renderText(el, textNode, stack) {
var ctx = stack.ctx,
function setTextVariables(ctx, el, text_decoration, color) {
var align = false,
font_style = getCSS(el, "fontStyle"),
bold = getCSS(el, "fontWeight"),
family = getCSS(el, "fontFamily"),
size = getCSS(el, "fontSize"),
color = getCSS(el, "color"),
text_decoration = getCSS(el, "textDecoration"),
text_align = getCSS(el, "textAlign"),
letter_spacing = getCSS(el, "letterSpacing"),
bounds,
text,
metrics,
renderList,
listLen,
bold = getCSS(el, "fontWeight"),
font_style = getCSS(el, "fontStyle"),
font_variant = getCSS(el, "fontVariant"),
align = false,
newTextNode,
textValue,
textOffset = 0,
oldTextNode,
c,
range,
parent,
wrapElement,
backupText;
textNode.nodeValue = textTransform(textNode.nodeValue, getCSS(el, "textTransform"));
text = trimText(textNode.nodeValue);
if (text.length>0){
if (text_decoration !== "none"){
metrics = fontMetrics(family, size);
}
text_align = text_align.replace(["-webkit-auto"],["auto"]);
renderList = (!options.letterRendering && /^(left|right|justify|auto)$/.test(text_align) && noLetterSpacing(letter_spacing)) ? textNode.nodeValue.split(/(\b| )/) : textNode.nodeValue.split("");
font_variant = getCSS(el, "fontVariant");
switch(parseInt(bold, 10)){
case 401:
@ -258,7 +226,59 @@ _html2canvas.Parse = function ( images, options ) {
ctx.setVariable("fillStyle", color);
ctx.setVariable("font", font_style+ " " + font_variant + " " + bold + " " + size + " " + family);
ctx.setVariable("textAlign", (align) ? "right" : "left");
if (text_decoration !== "none"){
return fontMetrics(family, size);
}
}
function renderTextDecoration(text_decoration, bounds, metrics, color) {
switch(text_decoration) {
case "underline":
// Draws a line at the baseline of the font
// TODO As some browsers display the line as more than 1px if the font-size is big, need to take that into account both in position and size
renderRect(ctx, bounds.left, Math.round(bounds.top + metrics.baseline + metrics.lineWidth), bounds.width, 1, color);
break;
case "overline":
renderRect(ctx, bounds.left, bounds.top, bounds.width, 1, color);
break;
case "line-through":
// TODO try and find exact position for line-through
renderRect(ctx, bounds.left, Math.ceil(bounds.top + metrics.middle + metrics.lineWidth), bounds.width, 1, color);
break;
}
}
function renderText(el, textNode, stack) {
var ctx = stack.ctx,
color = getCSS(el, "color"),
text_decoration = getCSS(el, "textDecoration"),
text_align = getCSS(el, "textAlign"),
letter_spacing = getCSS(el, "letterSpacing"),
bounds,
text,
metrics,
renderList,
listLen,
newTextNode,
textValue,
textOffset = 0,
oldTextNode,
c,
range,
parent,
wrapElement,
backupText;
textNode.nodeValue = textTransform(textNode.nodeValue, getCSS(el, "textTransform"));
text = trimText(textNode.nodeValue);
if (text.length > 0){
text_align = text_align.replace(["-webkit-auto"],["auto"]);
renderList = (!options.letterRendering && /^(left|right|justify|auto)$/.test(text_align) && noLetterSpacing(letter_spacing)) ? textNode.nodeValue.split(/(\b| )/) : textNode.nodeValue.split("");
metrics = setTextVariables(ctx, el, text_decoration, color);
oldTextNode = textNode;
for ( c=0, listLen = renderList.length; c < listLen; c+=1 ) {
@ -311,24 +331,9 @@ _html2canvas.Parse = function ( images, options ) {
}
if (textValue !== null){
drawText(textValue, bounds.left, bounds.bottom, ctx);
}
switch(text_decoration) {
case "underline":
// Draws a line at the baseline of the font
// TODO As some browsers display the line as more than 1px if the font-size is big, need to take that into account both in position and size
renderRect(ctx, bounds.left, Math.round(bounds.top + metrics.baseline + metrics.lineWidth), bounds.width, 1, color);
break;
case "overline":
renderRect(ctx, bounds.left, bounds.top, bounds.width, 1, color);
break;
case "line-through":
// TODO try and find exact position for line-through
renderRect(ctx, bounds.left, Math.ceil(bounds.top + metrics.middle + metrics.lineWidth), bounds.width, 1, color);
break;
}
drawText(textValue, bounds.left, bounds.bottom, ctx);
renderTextDecoration(text_decoration, bounds, metrics, color);
textOffset += renderList[c].length;
@ -358,8 +363,6 @@ _html2canvas.Parse = function ( images, options ) {
return bounds;
}
function elementIndex( el ) {
var i = -1,
count = 1,