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Checks if subpixel-aa enabled before scaling the fonts

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This commit is contained in:
Yury Delendik 2014-01-14 17:31:23 -06:00
parent a340336269
commit 7e75a665d2
1 changed files with 19 additions and 2 deletions
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21
src/display/canvas.js
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@ -16,7 +16,7 @@
*/
/* globals ColorSpace, DeviceCmykCS, DeviceGrayCS, DeviceRgbCS, error,
FONT_IDENTITY_MATRIX, IDENTITY_MATRIX, ImageData, isArray, isNum,
Pattern, TilingPattern, Util, warn, assert, info,
Pattern, TilingPattern, Util, warn, assert, info, shadow,
TextRenderingMode, OPS, Promise */
'use strict';
@ -1050,6 +1050,23 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
}
},
get isFontSubpixelAAEnabled() {
// Checks if anti-aliasing is enabled when scaled text is painted.
// On Windows GDI scaled fonts looks bad.
var ctx = document.createElement('canvas').getContext('2d');
ctx.scale(1.5, 1);
ctx.fillText('I', 0, 10);
var data = ctx.getImageData(0, 0, 10, 10).data;
var enabled = false;
for (var i = 3; i < data.length; i += 4) {
if (data[i] > 0 && data[i] < 255) {
enabled = true;
break;
}
}
return shadow(this, 'isFontSubpixelAAEnabled', enabled);
},
showText: function CanvasGraphics_showText(glyphs, skipTextSelection) {
var ctx = this.ctx;
var current = this.current;
@ -1164,7 +1181,7 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
scaledY = 0;
}
if (font.remeasure && width > 0) {
if (font.remeasure && width > 0 && this.isFontSubpixelAAEnabled) {
// some standard fonts may not have the exact width, trying to
// rescale per character
var measuredWidth = ctx.measureText(character).width * 1000 /