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
5 REG_FIDDLE(Pixmap_readPixels, 256, 128, false, 0) {
draw(SkCanvas * canvas)6 void 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->drawBitmap(bitmap, 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->drawBitmap(bitmap, 0, 128);
30 }
31 } // END FIDDLE
32