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(Bitmap_readPixels, 256, 128, false, 0) {
draw(SkCanvas * canvas)5 void draw(SkCanvas* canvas) {
6 const int width = 256;
7 const int height = 64;
8 SkImageInfo srcInfo = SkImageInfo::MakeN32Premul(width, height);
9 SkColor gradColors[] = { 0xFFAA3300, 0x7F881122 };
10 SkPoint gradPoints[] = { { 0, 0 }, { 256, 0 } };
11 SkPaint paint;
12 paint.setShader(SkGradientShader::MakeLinear(gradPoints, gradColors, nullptr,
13 std::size(gradColors), SkTileMode::kClamp));
14 SkBitmap bitmap;
15 bitmap.allocPixels(srcInfo);
16 SkCanvas srcCanvas(bitmap);
17 srcCanvas.drawRect(SkRect::MakeWH(width, height), paint);
18 canvas->drawImage(bitmap.asImage(), 0, 0);
19 SkImageInfo dstInfo = srcInfo.makeColorType(kARGB_4444_SkColorType);
20 std::vector<int16_t> dstPixels;
21 dstPixels.resize(height * width);
22 bitmap.readPixels(dstInfo, &dstPixels.front(), width * 2, 0, 0);
23 SkPixmap dstPixmap(dstInfo, &dstPixels.front(), width * 2);
24 bitmap.installPixels(dstPixmap);
25 canvas->drawImage(bitmap.asImage(), 0, 64);
26 }
27 } // END FIDDLE
28