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/*
* Copyright 2013 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkBitmap.h"
#include "SkCanvas.h"
#include "SkData.h"
#include "SkForceLinking.h"
#include "SkImageDecoder.h"
#include "SkImagePriv.h"
#include "SkLazyPixelRef.h"
#include "SkScaledImageCache.h"
#include "SkStream.h"
#include "Test.h"
__SK_FORCE_IMAGE_DECODER_LINKING;
/**
* Fill this bitmap with some color.
*/
static void make_test_image(SkBitmap* bm) {
static const int W = 50, H = 50;
static const SkBitmap::Config config = SkBitmap::kARGB_8888_Config;
bm->setConfig(config, W, H);
bm->allocPixels();
bm->eraseColor(SK_ColorBLACK);
SkCanvas canvas(*bm);
SkPaint paint;
paint.setColor(SK_ColorBLUE);
canvas.drawRectCoords(0, 0, SkIntToScalar(W/2),
SkIntToScalar(H/2), paint);
paint.setColor(SK_ColorWHITE);
canvas.drawRectCoords(SkIntToScalar(W/2), SkIntToScalar(H/2),
SkIntToScalar(W), SkIntToScalar(H), paint);
}
/**
* encode this bitmap into some data via SkImageEncoder
*/
static SkData* create_data_from_bitmap(const SkBitmap& bm,
SkImageEncoder::Type type) {
SkDynamicMemoryWStream stream;
if (SkImageEncoder::EncodeStream(&stream, bm, type, 100)) {
return stream.copyToData();
}
return NULL;
}
/**
* A simplified version of SkBitmapFactory
*/
static bool simple_bitmap_factory(SkBitmapFactory::DecodeProc proc,
SkData* data,
SkBitmap* dst) {
SkImageInfo info;
if (!proc(data->data(), data->size(), &info, NULL)) {
return false;
}
dst->setConfig(SkImageInfoToBitmapConfig(info), info.fWidth,
info.fHeight, 0, info.fAlphaType);
SkAutoTUnref<SkLazyPixelRef> ref(SkNEW_ARGS(SkLazyPixelRef,
(data, proc, NULL)));
dst->setPixelRef(ref);
return true;
}
static void compare_bitmaps(skiatest::Reporter* reporter,
const SkBitmap& b1, const SkBitmap& b2,
bool pixelPerfect = true) {
REPORTER_ASSERT(reporter, b1.empty() == b2.empty());
REPORTER_ASSERT(reporter, b1.width() == b2.width());
REPORTER_ASSERT(reporter, b1.height() == b2.height());
REPORTER_ASSERT(reporter, b1.isNull() == b2.isNull());
SkAutoLockPixels autoLockPixels1(b1);
SkAutoLockPixels autoLockPixels2(b2);
REPORTER_ASSERT(reporter, b1.isNull() == b2.isNull());
if (b1.isNull() || b1.empty()) {
return;
}
REPORTER_ASSERT(reporter, NULL != b1.getPixels());
REPORTER_ASSERT(reporter, NULL != b2.getPixels());
if ((!(b1.getPixels())) || (!(b2.getPixels()))) {
return;
}
if ((b1.width() != b2.width()) ||
(b1.height() != b2.height())) {
return;
}
if (!pixelPerfect) {
return;
}
int pixelErrors = 0;
for (int y = 0; y < b2.height(); ++y) {
for (int x = 0; x < b2.width(); ++x) {
if (b1.getColor(x, y) != b2.getColor(x, y)) {
++pixelErrors;
}
}
}
REPORTER_ASSERT(reporter, 0 == pixelErrors);
}
/**
* This checks to see that a SkLazyPixelRef works as advertized.
*/
#include "TestClassDef.h"
DEF_TEST(CachedDecodingPixelRefTest, reporter) {
SkBitmap original;
make_test_image(&original);
const size_t bitmapSize = original.getSize();
const size_t oldByteLimit = SkScaledImageCache::GetByteLimit();
REPORTER_ASSERT(reporter, (!(original.empty())) && (!(original.isNull())));
static const SkImageEncoder::Type types[] = {
SkImageEncoder::kPNG_Type,
SkImageEncoder::kJPEG_Type,
SkImageEncoder::kWEBP_Type
};
for (size_t i = 0; i < SK_ARRAY_COUNT(types); i++) {
SkImageEncoder::Type type = types[i];
SkAutoDataUnref encoded(create_data_from_bitmap(original, type));
REPORTER_ASSERT(reporter, encoded.get() != NULL);
if (NULL == encoded.get()) {
continue;
}
SkBitmap lazy;
static const SkBitmapFactory::DecodeProc decoder =
&(SkImageDecoder::DecodeMemoryToTarget);
bool success = simple_bitmap_factory(decoder, encoded.get(), &lazy);
REPORTER_ASSERT(reporter, success);
size_t bytesUsed = SkScaledImageCache::GetBytesUsed();
if (oldByteLimit < bitmapSize) {
SkScaledImageCache::SetByteLimit(bitmapSize + oldByteLimit);
}
void* lazyPixels = NULL;
// Since this is lazy, it shouldn't have fPixels yet!
REPORTER_ASSERT(reporter, NULL == lazy.getPixels());
{
SkAutoLockPixels autoLockPixels(lazy); // now pixels are good.
lazyPixels = lazy.getPixels();
REPORTER_ASSERT(reporter, NULL != lazy.getPixels());
// first time we lock pixels, we should get bump in the size
// of the cache by exactly bitmapSize.
REPORTER_ASSERT(reporter, bytesUsed + bitmapSize
== SkScaledImageCache::GetBytesUsed());
bytesUsed = SkScaledImageCache::GetBytesUsed();
}
// pixels should be gone!
REPORTER_ASSERT(reporter, NULL == lazy.getPixels());
{
SkAutoLockPixels autoLockPixels(lazy); // now pixels are good.
REPORTER_ASSERT(reporter, NULL != lazy.getPixels());
// verify that the same pixels are used this time.
REPORTER_ASSERT(reporter, lazy.getPixels() == lazyPixels);
}
bool comparePixels = (SkImageEncoder::kPNG_Type == type);
// Only PNG is pixel-perfect.
compare_bitmaps(reporter, original, lazy, comparePixels);
// force the cache to clear by making it too small.
SkScaledImageCache::SetByteLimit(bitmapSize / 2);
compare_bitmaps(reporter, original, lazy, comparePixels);
// I'm pretty sure that the logic of the cache should mean
// that it will clear to zero, regardless of where it started.
REPORTER_ASSERT(reporter, SkScaledImageCache::GetBytesUsed() == 0);
// TODO(someone) - write a custom allocator that can verify
// that the memory where those pixels were cached really did
// get freed.
////////////////////////////////////////////////////////////////////////
// The following commented-out code happens to work on my
// machine, and indicates to me that the SkLazyPixelRef is
// behaving as designed. But I don't know an easy way to
// guarantee that a second allocation of the same size will
// give a different address.
////////////////////////////////////////////////////////////////////////
// {
// // confuse the heap allocation system
// SkAutoMalloc autoMalloc(bitmapSize);
// REPORTER_ASSERT(reporter, autoMalloc.get() == lazyPixels);
// {
// SkAutoLockPixels autoLockPixels(lazy);
// // verify that *different* pixels are used this time.
// REPORTER_ASSERT(reporter, lazy.getPixels() != lazyPixels);
// compare_bitmaps(reporter, original, lazy, comparePixels);
// }
// }
// restore cache size
SkScaledImageCache::SetByteLimit(oldByteLimit);
}
}
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