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=525285073aae7e53eb8f454a398f880c
5 REG_FIDDLE(Canvas_MakeRasterDirect, 256, 256, true, 0) {
draw(SkCanvas *)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
29