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=b2cbbbbcffb618865d8aae3bc04b2a62
5 REG_FIDDLE(Bitmap_readPixels, 256, 128, false, 0) {
draw(SkCanvas * canvas)6 void draw(SkCanvas* canvas) {
7 const int width = 256;
8 const int height = 64;
9 SkImageInfo srcInfo = SkImageInfo::MakeN32Premul(width, height);
10 SkColor gradColors[] = { 0xFFAA3300, 0x7F881122 };
11 SkPoint gradPoints[] = { { 0, 0 }, { 256, 0 } };
12 SkPaint paint;
13 paint.setShader(SkGradientShader::MakeLinear(gradPoints, gradColors, nullptr,
14 SK_ARRAY_COUNT(gradColors), SkTileMode::kClamp));
15 SkBitmap bitmap;
16 bitmap.allocPixels(srcInfo);
17 SkCanvas srcCanvas(bitmap);
18 srcCanvas.drawRect(SkRect::MakeWH(width, height), paint);
19 canvas->drawImage(bitmap.asImage(), 0, 0);
20 SkImageInfo dstInfo = srcInfo.makeColorType(kARGB_4444_SkColorType);
21 std::vector<int16_t> dstPixels;
22 dstPixels.resize(height * width);
23 bitmap.readPixels(dstInfo, &dstPixels.front(), width * 2, 0, 0);
24 SkPixmap dstPixmap(dstInfo, &dstPixels.front(), width * 2);
25 bitmap.installPixels(dstPixmap);
26 canvas->drawImage(bitmap.asImage(), 0, 64);
27 }
28 } // END FIDDLE
29