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      1 /*
      2  * Copyright 2014 Google Inc.
      3  *
      4  * Use of this source code is governed by a BSD-style license that can be
      5  * found in the LICENSE file.
      6  */
      7 
      8 #include "gm.h"
      9 #include "sk_tool_utils.h"
     10 #include "SkCanvas.h"
     11 #include "SkDashPathEffect.h"
     12 
     13 static void test_nulldev(SkCanvas* canvas) {
     14     SkBitmap bm;
     15     bm.setInfo(SkImageInfo::MakeN32Premul(30, 30));
     16     // notice: no pixels mom! be sure we don't crash
     17     // https://code.google.com/p/chromium/issues/detail?id=352616
     18     SkCanvas c(bm);
     19 
     20     SkBitmap src;
     21     src.allocN32Pixels(10, 10);
     22     src.eraseColor(SK_ColorRED);
     23 
     24     // ensure we don't crash
     25     c.writePixels(src, 0, 0);
     26 }
     27 
     28 static void draw_text_stroked(SkCanvas* canvas, const SkPaint& paint, SkScalar strokeWidth) {
     29     SkPaint p(paint);
     30     SkPoint loc = { 20, 435 };
     31 
     32     if (strokeWidth > 0) {
     33         p.setStyle(SkPaint::kFill_Style);
     34         canvas->drawString("P", loc.fX, loc.fY - 225, p);
     35         canvas->drawPosText("P", 1, &loc, p);
     36     }
     37 
     38     p.setColor(SK_ColorRED);
     39     p.setStyle(SkPaint::kStroke_Style);
     40     p.setStrokeWidth(strokeWidth);
     41 
     42     canvas->drawString("P", loc.fX, loc.fY - 225, p);
     43     canvas->drawPosText("P", 1, &loc, p);
     44 }
     45 
     46 static void draw_text_set(SkCanvas* canvas, const SkPaint& paint) {
     47     SkAutoCanvasRestore acr(canvas, true);
     48 
     49     draw_text_stroked(canvas, paint, 10);
     50 
     51     canvas->translate(200, 0);
     52     draw_text_stroked(canvas, paint, 0);
     53 
     54     const SkScalar intervals[] = { 20, 10, 5, 10 };
     55     const SkScalar phase = 0;
     56 
     57     canvas->translate(200, 0);
     58     SkPaint p(paint);
     59     p.setPathEffect(SkDashPathEffect::Make(intervals, SK_ARRAY_COUNT(intervals), phase));
     60     draw_text_stroked(canvas, p, 10);
     61 }
     62 
     63 namespace {
     64     enum {
     65         kBelowThreshold_TextSize = 255,
     66         kAboveThreshold_TextSize = 257
     67     };
     68 }
     69 
     70 DEF_SIMPLE_GM(stroketext, canvas, 1200, 480) {
     71         if (true) { test_nulldev(canvas); }
     72         SkPaint paint;
     73         paint.setAntiAlias(true);
     74         sk_tool_utils::set_portable_typeface(&paint);
     75 
     76         paint.setTextSize(kBelowThreshold_TextSize);
     77         draw_text_set(canvas, paint);
     78 
     79         canvas->translate(600, 0);
     80         paint.setTextSize(kAboveThreshold_TextSize);
     81         draw_text_set(canvas, paint);
     82 }
     83