android - AndroidSVG fuzzy edges on image -


i want display barcode on android. input svg string. svg library use androidsvg. used sample code library website , seem fine. when zoom on image, distorted edges (anti-alias?). tried disable flags. image still has fuzzy edges. can wrong code?

picture: try zoom max, see fuzzy edges. enter image description here

code:

private void loadqrcode(string svgstring) {     svg svg = null;     try {         svg = svg.getfromstring(svgstring);     } catch (svgparseexception e) {         e.printstacktrace();     }      if (svg.getdocumentwidth() != -1) {         int widthpx = utils.pxfromdp(400);         int heightdp = utils.pxfromdp(300);          svg.setdocumentwidth(widthpx);         svg.setdocumentheight(heightdp);          int width = (int) math.ceil(svg.getdocumentwidth());         int height = (int) math.ceil(svg.getdocumentheight());         bitmap newbm = bitmap.createbitmap(width, height, bitmap.config.argb_8888);          canvas bmcanvas = new canvas(newbm);         final drawfilter filter = new paintflagsdrawfilter(paint.anti_alias_flag| paint.filter_bitmap_flag | paint.dither_flag, 0);         bmcanvas.setdrawfilter(filter);          barcode.setlayertype(view.layer_type_software,null);         bmcanvas.drawrgb(255, 255, 255);          svg.rendertocanvas(bmcanvas);         barcode.setimagebitmap(newbm);     } }

if edges of bars not lie exactly on pixel boundaries, anti-aliasing. on high resolution screen, should not visible.

however, in code, rendering svg bitmap , setting bitmap imageview. if imageview has size larger bitmap - ie. greater 400 x 300, anti-aliased pixels in bitmap rendered larger , more visible.

one solution avoid using bitmap. use picture/picturedrawable instead. way barcode rendered @ highest quality no matter size is. vector graphics supposed be.

follow example on page:

http://bigbadaboom.github.io/androidsvg/use_with_imageview.html

so code should following:

private void loadqrcode(string svgstring) {     try {         svg svg = svg.getfromstring(svgstring);          barcode.setlayertype(view.layer_type_software,null);         drawable drawable = new picturedrawable(svg.rendertopicture());         barcode.setimagedrawable(drawable);      } catch (svgparseexception e) {         e.printstacktrace();     }  }

if reason need use bitmaps - maybe caching them or - should watch changes in size of imageview , recreate bitmap @ new size. bitmap same size imageview assigned.


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