submodule/skia/gm/overdrawcanvas.cpp

   1 /*
   2  * Copyright 2019 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/gm.h"
   9 #include "include/core/SkCanvas.h"
  10 #include "include/core/SkColor.h"
  11 #include "include/core/SkColorFilter.h"
  12 #include "include/core/SkFont.h"
  13 #include "include/core/SkFontTypes.h"
  14 #include "include/core/SkImage.h"
  15 #include "include/core/SkImageInfo.h"
  16 #include "include/core/SkOverdrawCanvas.h"
  17 #include "include/core/SkPaint.h"
  18 #include "include/core/SkRect.h"
  19 #include "include/core/SkRefCnt.h"
  20 #include "include/core/SkSurface.h"
  21 #include "include/core/SkTypes.h"
  22 #include "include/effects/SkOverdrawColorFilter.h"
  23
  24 #define WIDTH 500
  25 #define HEIGHT 500
  26
  27 static const SkColor kOverdrawColors[6] = {
  28     0x00000000, 0x5fff0000, 0x2f0000ff, 0x2f00ff00, 0x3fff0000, 0x7fff0000,
  29 };
  30
  31
  32 DEF_SIMPLE_GM_BG(overdraw_canvas,       canvas, WIDTH, HEIGHT, SK_ColorWHITE) {
  33     // Set up the overdraw canvas.
  34     SkImageInfo offscreenInfo = SkImageInfo::MakeA8(WIDTH, HEIGHT);
  35     sk_sp<SkSurface> offscreen = SkSurface::MakeRaster(offscreenInfo);
  36     auto c = offscreen->getCanvas();
  37
  38     SkOverdrawCanvas overdrawCanvas(c);
  39
  40     overdrawCanvas.drawRect(SkRect::MakeLTRB(10, 10, 200, 200), SkPaint());
  41     overdrawCanvas.drawRect(SkRect::MakeLTRB(20, 20, 190, 190), SkPaint());
  42     overdrawCanvas.drawRect(SkRect::MakeLTRB(30, 30, 180, 180), SkPaint());
  43     overdrawCanvas.drawRect(SkRect::MakeLTRB(40, 40, 170, 170), SkPaint());
  44     overdrawCanvas.drawRect(SkRect::MakeLTRB(50, 50, 160, 160), SkPaint());
  45     overdrawCanvas.drawRect(SkRect::MakeLTRB(60, 60, 150, 150), SkPaint());
  46
  47     char text[] = "Ae_p";
  48     overdrawCanvas.drawSimpleText(text, 4, SkTextEncoding::kUTF8, 300, 300, SkFont(), SkPaint());
  49
  50     sk_sp<SkImage> counts = offscreen->makeImageSnapshot();
  51
  52     // Draw overdraw colors to the canvas.  The color filter will convert counts to colors.
  53     SkPaint paint;
  54     paint.setColorFilter(SkOverdrawColorFilter::MakeWithSkColors(kOverdrawColors));
  55     canvas->drawImage(counts.get(), 0.0f, 0.0f, SkSamplingOptions(), &paint);
  56     canvas->drawString("This is some text:", 180, 300, SkFont(), SkPaint());
  57 }
  58