29 lines
1.5 KiB
C++
29 lines
1.5 KiB
C++
// Copyright 2019 Google LLC.
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// Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.
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#include "tools/fiddle/examples.h"
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// HASH=525285073aae7e53eb8f454a398f880c
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REG_FIDDLE(Canvas_MakeRasterDirect, 256, 256, true, 0) {
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void draw(SkCanvas* ) {
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SkImageInfo info = SkImageInfo::MakeN32Premul(3, 3); // device aligned, 32 bpp, Premultiplied
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const size_t minRowBytes = info.minRowBytes(); // bytes used by one bitmap row
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const size_t size = info.computeMinByteSize(); // bytes used by all rows
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SkAutoTMalloc<SkPMColor> storage(size); // allocate storage for pixels
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SkPMColor* pixels = storage.get(); // get pointer to allocated storage
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// create a SkCanvas backed by a raster device, and delete it when the
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// function goes out of scope.
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std::unique_ptr<SkCanvas> canvas = SkCanvas::MakeRasterDirect(info, pixels, minRowBytes);
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canvas->clear(SK_ColorWHITE); // white is Unpremultiplied, in ARGB order
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canvas->flush(); // ensure that pixels are cleared
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SkPMColor pmWhite = pixels[0]; // the Premultiplied format may vary
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SkPaint paint; // by default, draws black
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canvas->drawPoint(1, 1, paint); // draw in the center
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canvas->flush(); // ensure that point was drawn
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for (int y = 0; y < info.height(); ++y) {
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for (int x = 0; x < info.width(); ++x) {
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SkDebugf("%c", *pixels++ == pmWhite ? '-' : 'x');
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}
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SkDebugf("\n");
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}
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}
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} // END FIDDLE
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