std::pair<BYTE*, UINT> Picture::GetBitmapData(const WICRect& rect)
{
IWICBitmapLock* lock = nullptr;
bitmap->Lock(&rect,
WICBitmapLockRead | WICBitmapLockWrite,
&lock);
BYTE* dataPtr = nullptr;
UINT size = 0;
lock->GetDataPointer(&size, &dataPtr);
lock->Release();
return std::make_pair(dataPtr, size);
}
Image::Buffer * WIC::Api::CreateImage(char * data, unsigned dataSize, unsigned w, unsigned h, Image::Format format)
{
IWICBitmap * bitmap = 0;
factory->CreateBitmap(w, h, IMAGE_FORMAT_TO_WIC_GUID[format], WICBitmapCacheOnLoad, &bitmap);
if(!bitmap) return 0;
WICRect lockRect = { 0, 0, w, h };
IWICBitmapLock * lock = 0;
bitmap->Lock(&lockRect, WICBitmapLockWrite, &lock);
if(!lock)
{
bitmap->Release();
return 0;
}
unsigned bufferSize = 0;
WICInProcPointer dataPointer = 0;
lock->GetDataPointer(&bufferSize, &dataPointer);
memcpy(dataPointer, data, dataSize);
lock->Release();
lock = 0;
if(format != Image::Format_4x8intRGBA)
{
IWICBitmapSource * convertedSource = 0;
WICConvertBitmapSource(GUID_WICPixelFormat32bppRGBA, bitmap, &convertedSource);
bitmap->Release();
bitmap = 0;
if(!convertedSource) return 0;
// Create the bitmap from the image frame.
factory->CreateBitmapFromSource(
convertedSource, // Create a bitmap from the image frame
WICBitmapCacheOnDemand, // Cache metadata when needed
&bitmap); // Pointer to the bitmap
convertedSource->Release();
if(!bitmap) return 0;
}
bitmap->Lock(&lockRect, WICBitmapLockWrite, &lock);
if(!lock)
{
bitmap->Release();
return 0;
}
return new WIC::Buffer(bitmap, lock, w, h);
}
// 解码照片的基础位图文件的.
HRESULT VideoEncoder::DecodeFrame(Photo* pPhoto, BYTE** ppOutputBitmap, int* pBitmapSize)
{
HRESULT hr = S_OK;
IWICBitmapDecoder *pDecoder = nullptr;
IWICBitmapFrameDecode *pFrame = nullptr;
IWICBitmap* pSourceBitmap = nullptr;
IWICBitmapLock* pLock = nullptr;
BYTE* pSourceBuffer = nullptr;
BYTE* pDestinationBuffer = nullptr;
UINT pixelWidth;
UINT pixelHeight;
WICRect lockRect;
*ppOutputBitmap = nullptr;
hr = m_pIWICFactory->CreateDecoderFromFilename(
pPhoto->GetFile().c_str(),
nullptr,
GENERIC_READ,
WICDecodeMetadataCacheOnDemand,
&pDecoder
);
CheckHR(hr);
this->m_logFileStream << "WIC解码器创建成功." << endl;
GUID containerFormat;
CheckHR(pDecoder->GetContainerFormat(&containerFormat));
// 我们仅支持jpg 文件.
if (containerFormat != GUID_ContainerFormatJpeg)
{
this->m_logFileStream << "仅支持jpeg文件." << endl;
return E_NOTSUPPORTEDFORMAT;
}
// 我们仅支持jpg 文件. 因此只有一桢.
CheckHR(pDecoder->GetFrame(0, &pFrame));
// TODO: 目前我们需要所有照片有相同的大小.
// 如果需求在将来发生变化，修改代码.
pFrame->GetSize(&pixelWidth, &pixelHeight);
if (pixelWidth != this->m_frameWidth || pixelHeight != this->m_frameHeight)
{
this->m_logFileStream << "所有的照片必须使用固定的大小." << endl;
return E_IMAGESIZEINCORRECT;
}
// 创建源位图对象.
CheckHR(this->m_pIWICFactory->CreateBitmapFromSource(pFrame, WICBitmapCacheOnLoad, &pSourceBitmap));
this->m_logFileStream << "位图资源创建成功." << endl;
lockRect.X = 0;
lockRect.Y = 0;
lockRect.Width = pixelWidth;
lockRect.Height = pixelHeight;
CheckHR(pSourceBitmap->Lock(&lockRect, WICBitmapLockWrite, &pLock));
UINT sourceBufferSize;
CheckHR(pLock->GetDataPointer(&sourceBufferSize, &pSourceBuffer));
// Jpg BGR 位图转换 RGBA 格式.
UINT destinationBufferSize = sourceBufferSize / 3 * 4;
pDestinationBuffer = new BYTE[destinationBufferSize];
for (UINT i = 0, j = 0; i < sourceBufferSize; i+=3, j+=4)
{
pDestinationBuffer[j] = pSourceBuffer[i]; // R
pDestinationBuffer[j + 1] = pSourceBuffer[i + 1]; // G
pDestinationBuffer[j + 2] = pSourceBuffer[i + 2]; // B
pDestinationBuffer[j + 3] = 255; // A
}
*ppOutputBitmap = pDestinationBuffer;
*pBitmapSize = destinationBufferSize;
cleanup:
if (!SUCCEEDED(hr))
{
DWORD error = GetLastError();
this->m_logFileStream << "意外错误: " << error << endl;
this->m_logFileStream << "HResult是: " << hr << endl;
}
if (pSourceBuffer != nullptr)
{
// 删除pSourceBuffer;
}
SafeRelease(&pDecoder);
SafeRelease(&pFrame);
SafeRelease(&pSourceBitmap);
SafeRelease(&pLock);
return hr;
}
