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=eb6f861ca1839146d26e40d56c2a001c
5 REG_FIDDLE(Bitmap_tryAllocPixels_4, 256, 100, false, 0) {
6 class LargePixelRef : public SkPixelRef {
7 public:
LargePixelRef(const SkImageInfo & info,char * storage,size_t rowBytes)8 LargePixelRef(const SkImageInfo& info, char* storage, size_t rowBytes)
9 : SkPixelRef(info.width(), info.height(), storage, rowBytes) {
10 }
~LargePixelRef()11 ~LargePixelRef() override {
12 delete[] (char* ) this->pixels();
13 }
14 };
15 class LargeAllocator : public SkBitmap::Allocator {
16 public:
allocPixelRef(SkBitmap * bitmap)17 bool allocPixelRef(SkBitmap* bitmap) override {
18 const SkImageInfo& info = bitmap->info();
19 uint64_t rowBytes = info.minRowBytes64();
20 uint64_t size = info.height() * rowBytes;
21 char* addr = new char[size];
22 if (nullptr == addr) {
23 return false;
24 }
25 sk_sp<SkPixelRef> pr = sk_sp<SkPixelRef>(new LargePixelRef(info, addr, rowBytes));
26 if (!pr) {
27 return false;
28 }
29 bitmap->setPixelRef(std::move(pr), 0, 0);
30 return true;
31 }
32 };
33
draw(SkCanvas * canvas)34 void draw(SkCanvas* canvas) {
35 LargeAllocator largeAllocator;
36 SkBitmap bitmap;
37 int width = 100; // make this 20000
38 int height = 100; // and this 100000 to allocate 8 gigs on a 64-bit platform
39 bitmap.setInfo(SkImageInfo::MakeN32(width, height, kOpaque_SkAlphaType));
40 if (bitmap.tryAllocPixels(&largeAllocator)) {
41 bitmap.eraseColor(0xff55aa33);
42 canvas->drawImage(bitmap.asImage(), 0, 0);
43 }
44 }
45 } // END FIDDLE
46