gm/fatpathfill.cpp

   1 /*
   2  * Copyright 2012 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 "SkPath.h"
  12 #include "SkSurface.h"
  13
  14 #define ZOOM    32
  15 #define SMALL_W 9
  16 #define SMALL_H 3
  17 #define REPEAT_LOOP 5
  18
  19 static sk_sp<SkSurface> new_surface(int width, int height) {
  20     return SkSurface::MakeRasterN32Premul(width, height);
  21 }
  22
  23 static void draw_pixel_centers(SkCanvas* canvas) {
  24     SkPaint paint;
  25     paint.setColor(sk_tool_utils::color_to_565(0xFF0088FF));
  26     paint.setAntiAlias(true);
  27
  28     for (int y = 0; y < SMALL_H; ++y) {
  29         for (int x = 0; x < SMALL_W; ++x) {
  30             canvas->drawCircle(x + 0.5f, y + 0.5f, 1.5f / ZOOM, paint);
  31         }
  32     }
  33 }
  34
  35 static void draw_fatpath(SkCanvas* canvas, SkSurface* surface, const SkPath& path) {
  36     SkPaint paint;
  37
  38     surface->getCanvas()->clear(SK_ColorTRANSPARENT);
  39     surface->getCanvas()->drawPath(path, paint);
  40     surface->draw(canvas, 0, 0, nullptr);
  41
  42     paint.setAntiAlias(true);
  43     paint.setColor(SK_ColorRED);
  44     paint.setStyle(SkPaint::kStroke_Style);
  45     canvas->drawPath(path, paint);
  46
  47     draw_pixel_centers(canvas);
  48 }
  49
  50 DEF_SIMPLE_GM(fatpathfill, canvas,
  51               SMALL_W * ZOOM,
  52               SMALL_H * ZOOM * REPEAT_LOOP) {
  53         auto surface(new_surface(SMALL_W, SMALL_H));
  54
  55         canvas->scale(ZOOM, ZOOM);
  56
  57         SkPaint paint;
  58         paint.setStyle(SkPaint::kStroke_Style);
  59         paint.setStrokeWidth(SK_Scalar1);
  60
  61         for (int i = 0; i < REPEAT_LOOP; ++i) {
  62             SkPath line, path;
  63             line.moveTo(1, 2);
  64             line.lineTo(SkIntToScalar(4 + i), 1);
  65             paint.getFillPath(line, &path);
  66             draw_fatpath(canvas, surface.get(), path);
  67
  68             canvas->translate(0, SMALL_H);
  69         }
  70 }