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 REG_FIDDLE(Canvas_MakeRasterDirect, 256, 256, true, 0) {
draw(SkCanvas *)5 void draw(SkCanvas*) {
6 SkImageInfo info = SkImageInfo::MakeN32Premul(3, 3); // device aligned, 32 bpp, Premultiplied
7 const size_t minRowBytes = info.minRowBytes(); // bytes used by one bitmap row
8 const size_t size = info.computeMinByteSize(); // bytes used by all rows
9 SkPMColor* pixels = new SkPMColor[size]; // allocate storage for pixels
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::MakeRasterDirect(info, pixels, minRowBytes);
13 canvas->clear(SK_ColorWHITE); // white is Unpremultiplied, in ARGB order
14 SkPMColor pmWhite = pixels[0]; // the Premultiplied format may vary
15 SkPaint paint; // by default, draws black
16 canvas->drawPoint(1, 1, paint); // draw in the center
17 for (int y = 0; y < info.height(); ++y) {
18 for (int x = 0; x < info.width(); ++x) {
19 SkDebugf("%c", *pixels++ == pmWhite ? '-' : 'x');
20 }
21 SkDebugf("\n");
22 }
23 delete[] pixels;
24 }
25 } // END FIDDLE
26