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=df4e355c4845350daede833b4fd21ec1
5REG_FIDDLE(Pixmap_readPixels, 256, 128, false, 0) {
6void draw(SkCanvas* canvas) {
7    std::vector<int32_t> pixels;
8    const int width = 256;
9    const int height = 64;
10    pixels.resize(height * width * 4);
11    SkImageInfo srcInfo = SkImageInfo::MakeN32Premul(width, height);
12    SkPixmap srcPixmap(srcInfo, (const void*) &pixels.front(), width * 4);
13    SkColor  gradColors[] = { 0xFFAA3300, 0x7F881122 };
14    SkPoint  gradPoints[] = { { 0, 0 }, { 256, 0 } };
15    SkPaint paint;
16    paint.setShader(SkGradientShader::MakeLinear(gradPoints, gradColors, nullptr,
17                    SK_ARRAY_COUNT(gradColors), SkTileMode::kClamp));
18    SkBitmap bitmap;
19    bitmap.installPixels(srcPixmap);
20    SkCanvas srcCanvas(bitmap);
21    srcCanvas.drawRect(SkRect::MakeWH(width, height), paint);
22    canvas->drawImage(bitmap.asImage(), 0, 0);
23    std::vector<int32_t> dstPixels;
24    dstPixels.resize(height * width * 2);
25    SkImageInfo dstInfo = srcInfo.makeColorType(kARGB_4444_SkColorType);
26    srcPixmap.readPixels(dstInfo, &dstPixels.front(), width * 2);
27    SkPixmap dstPixmap(dstInfo, &dstPixels.front(), width * 2);
28    bitmap.installPixels(dstPixmap);
29    canvas->drawImage(bitmap.asImage(), 0, 128);
30}
31}  // END FIDDLE
32