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=5949c9a63610cae30019e5b1899ee38f
5 REG_FIDDLE(Image_scalePixels, 256, 128, false, 3) {
draw(SkCanvas * canvas)6 void draw(SkCanvas* canvas) {
7 std::vector<int32_t> srcPixels;
8 int quarterWidth = image->width() / 16;
9 int rowBytes = quarterWidth * 4;
10 int quarterHeight = image->height() / 16;
11 srcPixels.resize(quarterHeight * rowBytes);
12 SkPixmap pixmap(SkImageInfo::MakeN32Premul(quarterWidth, quarterHeight),
13 &srcPixels.front(), rowBytes);
14 canvas->scale(4, 4);
15 SkFilterQuality qualities[] = { kNone_SkFilterQuality, kLow_SkFilterQuality,
16 kMedium_SkFilterQuality, kHigh_SkFilterQuality };
17 for (unsigned index = 0; index < SK_ARRAY_COUNT(qualities); ++index) {
18 image->scalePixels(pixmap, qualities[index]);
19 sk_sp<SkImage> filtered = SkImage::MakeFromRaster(pixmap, nullptr, nullptr);
20 canvas->drawImage(filtered, 16 * index, 0);
21 }
22 }
23 } // END FIDDLE
24