submodule/skia/docs/examples/Canvas_drawImageRect_4.cpp

   1 // Copyright 2019 Google LLC.
   2 // Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.
   3 #include "tools/fiddle/examples.h"
   4 // HASH=d4b35a9d24c32c042bd1f529b8de3c0d
   5 REG_FIDDLE(Canvas_drawImageRect_4, 256, 64, false, 0) {
   6 void draw(SkCanvas* canvas) {
   7     uint32_t pixels[][2] = { { SK_ColorBLACK, SK_ColorWHITE },
   8                              { SK_ColorWHITE, SK_ColorBLACK } };
   9     SkBitmap bitmap;
  10     bitmap.installPixels(SkImageInfo::MakeN32Premul(2, 2),
  11             (void*) pixels, sizeof(pixels[0]));
  12     sk_sp<SkImage> image = bitmap.asImage();
  13     SkPaint paint;
  14     canvas->scale(4, 4);
  15     for (auto alpha : { 50, 100, 150, 255 } ) {
  16         paint.setAlpha(alpha);
  17         canvas->drawImageRect(image, SkRect::MakeWH(2, 2), SkRect::MakeWH(8, 8),
  18                               SkSamplingOptions(), &paint, SkCanvas::kStrict_SrcRectConstraint);
  19         canvas->translate(8, 0);
  20     }
  21 }
  22 }  // END FIDDLE