Sakurai/pdf.js
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add stroke and other text rendering modes

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notmasteryet 2011-12-02 22:30:31 -06:00
parent 00d1204705
commit 2719e8eadc
1 changed files with 27 additions and 5 deletions
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32
src/canvas.js
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@ -6,6 +6,17 @@
// <canvas> contexts store most of the state we need natively.
// However, PDF needs a bit more state, which we store here.
var TextRenderingMode = {
FILL: 0,
STROKE: 1,
FILL_STROKE: 2,
INVISIBLE: 3,
FILL_ADD_TO_PATH: 4,
STROKE_ADD_TO_PATH: 5,
FILL_STROKE_ADD_TO_PATH: 6,
ADD_TO_PATH: 7
};
var CanvasExtraState = (function canvasExtraState() {
function constructor(old) {
// Are soft masks and alpha values shapes or opacities?
@ -23,7 +34,7 @@ var CanvasExtraState = (function canvasExtraState() {
this.charSpacing = 0;
this.wordSpacing = 0;
this.textHScale = 1;
this.textRenderingMode = 0;
this.textRenderingMode = TextRenderingMode.FILL;
// Color spaces
this.fillColorSpace = new DeviceGrayCS();
this.fillColorSpaceObj = null;
@ -544,7 +555,7 @@ var CanvasGraphics = (function canvasGraphics() {
this.ctx.font = rule;
},
setTextRenderingMode: function canvasGraphicsSetTextRenderingMode(mode) {
if (mode != 0 && mode != 3)
if (mode >= TextRenderingMode.FILL_ADD_TO_PATH)
TODO('unsupported text rendering mode: ' + mode);
this.current.textRenderingMode = mode;
},
@ -699,11 +710,22 @@ var CanvasGraphics = (function canvasGraphics() {
var charWidth = glyph.width * fontSize * 0.001 + charSpacing;
switch (textRenderingMode) {
default: // unsupported rendering mode
case 0: // fill
default: // other unsupported rendering modes
case TextRenderingMode.FILL:
case TextRenderingMode.FILL_ADD_TO_PATH:
ctx.fillText(char, width, 0);
break;
case 3: // invisible
case TextRenderingMode.STROKE:
case TextRenderingMode.STROKE_ADD_TO_PATH:
ctx.strokeText(char, width, 0);
break;
case TextRenderingMode.FILL_STROKE:
case TextRenderingMode.FILL_STROKE_ADD_TO_PATH:
ctx.fillText(char, width, 0);
ctx.strokeText(char, width, 0);
break;
case TextRenderingMode.INVISIBLE:
break;
}
width += charWidth;