本文整理汇总了C++中OwnArrayPtr::clear方法的典型用法代码示例。如果您正苦于以下问题：C++ OwnArrayPtr::clear方法的具体用法？C++ OwnArrayPtr::clear怎么用？C++ OwnArrayPtr::clear使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类OwnArrayPtr的用法示例。
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示例1: dumpImage
void TestShell::dumpImage(SkCanvas* canvas) const
{
// Fix the alpha. The expected PNGs on Mac have an alpha channel, so we want
// to keep it. On Windows, the alpha channel is wrong since text/form control
// drawing may have erased it in a few places. So on Windows we force it to
// opaque and also don't write the alpha channel for the reference. Linux
// doesn't have the wrong alpha like Windows, but we match Windows.
#if OS(MAC_OS_X)
bool discardTransparency = false;
#else
bool discardTransparency = true;
makeCanvasOpaque(canvas);
#endif
const SkBitmap& sourceBitmap = canvas->getTopDevice()->accessBitmap(false);
SkAutoLockPixels sourceBitmapLock(sourceBitmap);
// Compute MD5 sum.
MD5 digester;
Vector<uint8_t, 16> digestValue;
#if OS(ANDROID)
// On Android, pixel layout is RGBA (see third_party/skia/include/core/SkColorPriv.h);
// however, other Chrome platforms use BGRA (see skia/config/SkUserConfig.h).
// To match the checksum of other Chrome platforms, we need to reorder the layout of pixels.
// NOTE: The following code assumes we use SkBitmap::kARGB_8888_Config,
// which has been checked in device.makeOpaque() (see above).
const uint8_t* rawPixels = reinterpret_cast<const uint8_t*>(sourceBitmap.getPixels());
size_t bitmapSize = sourceBitmap.getSize();
OwnArrayPtr<uint8_t> reorderedPixels = adoptArrayPtr(new uint8_t[bitmapSize]);
for (size_t i = 0; i < bitmapSize; i += 4) {
reorderedPixels[i] = rawPixels[i + 2]; // R
reorderedPixels[i + 1] = rawPixels[i + 1]; // G
reorderedPixels[i + 2] = rawPixels[i]; // B
reorderedPixels[i + 3] = rawPixels[i + 3]; // A
}
digester.addBytes(reorderedPixels.get(), bitmapSize);
reorderedPixels.clear();
#else
digester.addBytes(reinterpret_cast<const uint8_t*>(sourceBitmap.getPixels()), sourceBitmap.getSize());
#endif
digester.checksum(digestValue);
string md5hash;
md5hash.reserve(16 * 2);
for (unsigned i = 0; i < 16; ++i) {
char hex[3];
// Use "x", not "X". The string must be lowercased.
sprintf(hex, "%02x", digestValue[i]);
md5hash.append(hex);
}
// Only encode and dump the png if the hashes don't match. Encoding the
// image is really expensive.
if (md5hash.compare(m_params.pixelHash)) {
std::vector<unsigned char> png;
#if OS(ANDROID)
webkit_support::EncodeRGBAPNGWithChecksum(reinterpret_cast<const unsigned char*>(sourceBitmap.getPixels()), sourceBitmap.width(),
sourceBitmap.height(), static_cast<int>(sourceBitmap.rowBytes()), discardTransparency, md5hash, &png);
#else
webkit_support::EncodeBGRAPNGWithChecksum(reinterpret_cast<const unsigned char*>(sourceBitmap.getPixels()), sourceBitmap.width(),
sourceBitmap.height(), static_cast<int>(sourceBitmap.rowBytes()), discardTransparency, md5hash, &png);
#endif
m_printer->handleImage(md5hash.c_str(), m_params.pixelHash.c_str(), &png[0], png.size(), m_params.pixelFileName.c_str());
} else
m_printer->handleImage(md5hash.c_str(), m_params.pixelHash.c_str(), 0, 0, m_params.pixelFileName.c_str());
}