Hal Canary | 8751512 | 2019-03-15 14:22:51 -0400 | [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. |
Mike Klein | c0bd9f9 | 2019-04-23 12:05:21 -0500 | [diff] [blame] | 3 | #include "tools/fiddle/examples.h" |
Hal Canary | 8751512 | 2019-03-15 14:22:51 -0400 | [diff] [blame] | 4 | // HASH=525285073aae7e53eb8f454a398f880c |
Hal Canary | a7181e7c | 2019-03-18 16:06:34 -0400 | [diff] [blame] | 5 | REG_FIDDLE(Canvas_MakeRasterDirect, 256, 256, true, 0) { |
Hal Canary | 8751512 | 2019-03-15 14:22:51 -0400 | [diff] [blame] | 6 | void draw(SkCanvas* ) { |
| 7 | SkImageInfo info = SkImageInfo::MakeN32Premul(3, 3); // device aligned, 32 bpp, Premultiplied |
| 8 | const size_t minRowBytes = info.minRowBytes(); // bytes used by one bitmap row |
| 9 | const size_t size = info.computeMinByteSize(); // bytes used by all rows |
| 10 | SkAutoTMalloc<SkPMColor> storage(size); // allocate storage for pixels |
| 11 | SkPMColor* pixels = storage.get(); // get pointer to allocated storage |
| 12 | // create a SkCanvas backed by a raster device, and delete it when the |
| 13 | // function goes out of scope. |
| 14 | std::unique_ptr<SkCanvas> canvas = SkCanvas::MakeRasterDirect(info, pixels, minRowBytes); |
| 15 | canvas->clear(SK_ColorWHITE); // white is Unpremultiplied, in ARGB order |
| 16 | canvas->flush(); // ensure that pixels are cleared |
| 17 | SkPMColor pmWhite = pixels[0]; // the Premultiplied format may vary |
| 18 | SkPaint paint; // by default, draws black |
| 19 | canvas->drawPoint(1, 1, paint); // draw in the center |
| 20 | canvas->flush(); // ensure that point was drawn |
| 21 | for (int y = 0; y < info.height(); ++y) { |
| 22 | for (int x = 0; x < info.width(); ++x) { |
| 23 | SkDebugf("%c", *pixels++ == pmWhite ? '-' : 'x'); |
| 24 | } |
| 25 | SkDebugf("\n"); |
| 26 | } |
| 27 | } |
| 28 | } // END FIDDLE |