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Merge pull request #1173 from notmasteryet/tree-66

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Fixes browsers minimal font limitations
This commit is contained in:
Brendan Dahl 2012-02-14 09:05:21 -08:00
commit 612151d1bc
3 changed files with 38 additions and 7 deletions
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37
src/canvas.js
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@ -17,11 +17,15 @@ var TextRenderingMode = {
ADD_TO_PATH: 7
};
// Minimal font size that would be used during canvas fillText operations.
var MIN_FONT_SIZE = 1;
var CanvasExtraState = (function CanvasExtraStateClosure() {
function CanvasExtraState(old) {
// Are soft masks and alpha values shapes or opacities?
this.alphaIsShape = false;
this.fontSize = 0;
this.fontSizeScale = 1;
this.textMatrix = IDENTITY_MATRIX;
this.fontMatrix = IDENTITY_MATRIX;
this.leading = 0;
@ -577,6 +581,9 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
this.current.font = fontObj;
this.current.fontSize = size;
if (fontObj.coded)
return; // we don't need ctx.font for Type3 fonts
var name = fontObj.loadedName || 'sans-serif';
var bold = fontObj.black ? (fontObj.bold ? 'bolder' : 'bold') :
(fontObj.bold ? 'bold' : 'normal');
@ -584,7 +591,16 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
var italic = fontObj.italic ? 'italic' : 'normal';
var serif = fontObj.isSerifFont ? 'serif' : 'sans-serif';
var typeface = '"' + name + '", ' + serif;
var rule = italic + ' ' + bold + ' ' + size + 'px ' + typeface;
// Some font backends cannot handle fonts below certain size.
// Keeping the font at minimal size and using the fontSizeScale to change
// the current transformation matrix before the fillText/strokeText.
// See https://bugzilla.mozilla.org/show_bug.cgi?id=726227
var browserFontSize = size >= MIN_FONT_SIZE ? size : MIN_FONT_SIZE;
this.current.fontSizeScale = browserFontSize != MIN_FONT_SIZE ? 1.0 :
size / MIN_FONT_SIZE;
var rule = italic + ' ' + bold + ' ' + browserFontSize + 'px ' + typeface;
this.ctx.font = rule;
},
setTextRenderingMode: function canvasGraphicsSetTextRenderingMode(mode) {
@ -647,6 +663,7 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
var font = current.font;
var glyphs = font.charsToGlyphs(str);
var fontSize = current.fontSize;
var fontSizeScale = current.fontSizeScale;
var charSpacing = current.charSpacing;
var wordSpacing = current.wordSpacing;
var textHScale = current.textHScale;
@ -710,11 +727,16 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
else
lineWidth /= scale;
ctx.lineWidth = lineWidth;
if (textSelection)
text.geom = this.getTextGeometry();
if (fontSizeScale != 1.0) {
ctx.scale(fontSizeScale, fontSizeScale);
lineWidth /= fontSizeScale;
}
ctx.lineWidth = lineWidth;
var x = 0;
for (var i = 0; i < glyphsLength; ++i) {
var glyph = glyphs[i];
@ -728,20 +750,21 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
var charWidth = glyph.width * fontSize * 0.001 +
Util.sign(current.fontMatrix[0]) * charSpacing;
var scaledX = x / fontSizeScale;
switch (textRenderingMode) {
default: // other unsupported rendering modes
case TextRenderingMode.FILL:
case TextRenderingMode.FILL_ADD_TO_PATH:
ctx.fillText(char, x, 0);
ctx.fillText(char, scaledX, 0);
break;
case TextRenderingMode.STROKE:
case TextRenderingMode.STROKE_ADD_TO_PATH:
ctx.strokeText(char, x, 0);
ctx.strokeText(char, scaledX, 0);
break;
case TextRenderingMode.FILL_STROKE:
case TextRenderingMode.FILL_STROKE_ADD_TO_PATH:
ctx.fillText(char, x, 0);
ctx.strokeText(char, x, 0);
ctx.fillText(char, scaledX, 0);
ctx.strokeText(char, scaledX, 0);
break;
case TextRenderingMode.INVISIBLE:
break;