31 lines
1.3 KiB
C++
31 lines
1.3 KiB
C++
// Copyright 2019 Google LLC.
|
|
// Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.
|
|
#include "tools/fiddle/examples.h"
|
|
// HASH=87f55e62ec4c3535e1a5d0f1415b20c6
|
|
REG_FIDDLE(Canvas_MakeRasterDirectN32, 256, 256, true, 0) {
|
|
void draw(SkCanvas* ) {
|
|
const int width = 3;
|
|
const int height = 3;
|
|
SkPMColor pixels[height][width]; // allocate a 3 by 3 Premultiplied bitmap on the stack
|
|
// create a SkCanvas backed by a raster device, and delete it when the
|
|
// function goes out of scope.
|
|
std::unique_ptr<SkCanvas> canvas = SkCanvas::MakeRasterDirectN32(
|
|
width,
|
|
height,
|
|
pixels[0], // top-left of the bitmap
|
|
sizeof(pixels[0])); // byte width of the each row
|
|
// write a Premultiplied value for white into all pixels in the bitmap
|
|
canvas->clear(SK_ColorWHITE);
|
|
SkPMColor pmWhite = pixels[0][0]; // the Premultiplied format may vary
|
|
SkPaint paint; // by default, draws black
|
|
canvas->drawPoint(1, 1, paint); // draw in the center
|
|
canvas->flush(); // ensure that pixels is ready to be read
|
|
for (int y = 0; y < height; ++y) {
|
|
for (int x = 0; x < width; ++x) {
|
|
SkDebugf("%c", pixels[y][x] == pmWhite ? '-' : 'x');
|
|
}
|
|
SkDebugf("\n");
|
|
}
|
|
}
|
|
} // END FIDDLE
|