Xiaoming Shi | 73dfa20 | 2020-03-12 11:31:35 -0700 | [diff] [blame] | 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=87f55e62ec4c3535e1a5d0f1415b20c6 |
| 5 | REG_FIDDLE(Canvas_MakeRasterDirectN32, 256, 256, true, 0) { |
| 6 | void draw(SkCanvas* ) { |
| 7 | const int width = 3; |
| 8 | const int height = 3; |
| 9 | SkPMColor pixels[height][width]; // allocate a 3 by 3 Premultiplied bitmap on the stack |
| 10 | // create a SkCanvas backed by a raster device, and delete it when the |
| 11 | // function goes out of scope. |
| 12 | std::unique_ptr<SkCanvas> canvas = SkCanvas::MakeRasterDirectN32( |
| 13 | width, |
| 14 | height, |
| 15 | pixels[0], // top-left of the bitmap |
| 16 | sizeof(pixels[0])); // byte width of the each row |
| 17 | // write a Premultiplied value for white into all pixels in the bitmap |
| 18 | canvas->clear(SK_ColorWHITE); |
| 19 | SkPMColor pmWhite = pixels[0][0]; // the Premultiplied format may vary |
| 20 | SkPaint paint; // by default, draws black |
| 21 | canvas->drawPoint(1, 1, paint); // draw in the center |
| 22 | canvas->flush(); // ensure that pixels is ready to be read |
| 23 | for (int y = 0; y < height; ++y) { |
| 24 | for (int x = 0; x < width; ++x) { |
| 25 | SkDebugf("%c", pixels[y][x] == pmWhite ? '-' : 'x'); |
| 26 | } |
| 27 | SkDebugf("\n"); |
| 28 | } |
| 29 | } |
| 30 | } // END FIDDLE |