46 lines
1.5 KiB
C++
46 lines
1.5 KiB
C++
// Copyright 2019 Google LLC.
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// Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.
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#include "tools/fiddle/examples.h"
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// HASH=eb6f861ca1839146d26e40d56c2a001c
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REG_FIDDLE(Bitmap_tryAllocPixels_4, 256, 100, false, 0) {
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class LargePixelRef : public SkPixelRef {
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public:
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LargePixelRef(const SkImageInfo& info, char* storage, size_t rowBytes)
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: SkPixelRef(info.width(), info.height(), storage, rowBytes) {
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}
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~LargePixelRef() override {
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delete[] (char* ) this->pixels();
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}
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};
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class LargeAllocator : public SkBitmap::Allocator {
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public:
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bool allocPixelRef(SkBitmap* bitmap) override {
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const SkImageInfo& info = bitmap->info();
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uint64_t rowBytes = info.minRowBytes64();
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uint64_t size = info.height() * rowBytes;
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char* addr = new char[size];
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if (nullptr == addr) {
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return false;
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}
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sk_sp<SkPixelRef> pr = sk_sp<SkPixelRef>(new LargePixelRef(info, addr, rowBytes));
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if (!pr) {
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return false;
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}
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bitmap->setPixelRef(std::move(pr), 0, 0);
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return true;
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}
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};
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void draw(SkCanvas* canvas) {
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LargeAllocator largeAllocator;
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SkBitmap bitmap;
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int width = 100; // make this 20000
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int height = 100; // and this 100000 to allocate 8 gigs on a 64-bit platform
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bitmap.setInfo(SkImageInfo::MakeN32(width, height, kOpaque_SkAlphaType));
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if (bitmap.tryAllocPixels(&largeAllocator)) {
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bitmap.eraseColor(0xff55aa33);
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canvas->drawImage(bitmap.asImage(), 0, 0);
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}
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}
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} // END FIDDLE
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