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