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ImageViewer.cpp
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ImageViewer.cpp
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// ImageViewer.cpp : 定义应用程序的入口点。
//
#include "stdafx.h"
#include "ImageViewer.h"
template <typename Type>
inline void SafeRelease(Type *&p)
{
if (nullptr != p)
{
p->Release();
p = nullptr;
}
}
INT_PTR CALLBACK About(HWND, UINT, WPARAM, LPARAM);
int APIENTRY wWinMain(_In_ HINSTANCE hInstance,
_In_opt_ HINSTANCE hPrevInstance,
_In_ LPWSTR lpCmdLine,
_In_ int nCmdShow)
{
UNREFERENCED_PARAMETER(hPrevInstance);
UNREFERENCED_PARAMETER(lpCmdLine);
/*UNREFERENCED_PARAMETER(nCmdShow);*/
HACCEL hAccelTable = LoadAccelerators(hInstance, MAKEINTRESOURCE(IDC_IMAGEVIEWER));
HeapSetInformation(nullptr, HeapEnableTerminationOnCorruption, nullptr, 0);
HRESULT hr = CoInitializeEx(nullptr, COINIT_APARTMENTTHREADED | COINIT_DISABLE_OLE1DDE);
if (SUCCEEDED(hr))
{
ImageViewer oViewer;
HRESULT hr = oViewer.Initialize(hInstance, nCmdShow);
if (SUCCEEDED(hr))
{
BOOL fRet;
MSG msg;
// Main message loop:
while ((fRet = GetMessage(&msg, nullptr, 0, 0)) != 0)
{
if (fRet == -1)
{
break;
}
else
{
if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
}
}
}
CoUninitialize();
}
else
{
return EXIT_FAILURE;
}
return EXIT_SUCCESS;
}
INT_PTR CALLBACK About(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)
{
UNREFERENCED_PARAMETER(lParam);
switch (message)
{
case WM_INITDIALOG:
return (INT_PTR)TRUE;
case WM_COMMAND:
if (LOWORD(wParam) == IDOK || LOWORD(wParam) == IDCANCEL)
{
EndDialog(hDlg, LOWORD(wParam));
return (INT_PTR)TRUE;
}
break;
}
return (INT_PTR)FALSE;
}
ImageViewer::ImageViewer()
{
m_hInst = nullptr;
m_hWnd = nullptr;
m_dwExStyle = WS_EX_ACCEPTFILES;
m_dwStyle = WS_OVERLAPPEDWINDOW | WS_VISIBLE;
m_pD2DBitmap = nullptr;
m_pConvertedSourceBitmap = nullptr;
m_pIWICFactory = nullptr;
m_pD2DFactory = nullptr;
m_pRT = nullptr;
}
ImageViewer::~ImageViewer()
{
SafeRelease(m_pD2DBitmap);
SafeRelease(m_pConvertedSourceBitmap);
SafeRelease(m_pIWICFactory);
SafeRelease(m_pD2DFactory);
SafeRelease(m_pRT);
}
HRESULT ImageViewer::Initialize(HINSTANCE hInstance, int nCmdShow)
{
HRESULT hr = S_OK;
// Create WIC factory
hr = CoCreateInstance(
CLSID_WICImagingFactory,
nullptr,
CLSCTX_INPROC_SERVER,
IID_PPV_ARGS(&m_pIWICFactory)
);
if (SUCCEEDED(hr))
{
// Create D2D factory
hr = D2D1CreateFactory(D2D1_FACTORY_TYPE_SINGLE_THREADED, &m_pD2DFactory);
}
if (SUCCEEDED(hr))
{
LoadStringW(hInstance, IDS_APP_TITLE, m_szTitle, MAX_LOADSTRING);
LoadStringW(hInstance, IDC_IMAGEVIEWER, m_szWindowClassName, MAX_LOADSTRING);
WNDCLASSEX wcex;
// Register window class
wcex.cbSize = sizeof(WNDCLASSEX);
wcex.style = CS_HREDRAW | CS_VREDRAW;
wcex.lpfnWndProc = s_WndProc;
wcex.cbClsExtra = 0;
wcex.cbWndExtra = 0;
wcex.hInstance = hInstance;
wcex.hIcon = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_IMAGEVIEWER));
wcex.hCursor = LoadCursor(nullptr, IDC_ARROW);
wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);
wcex.lpszMenuName = MAKEINTRESOURCEW(IDC_IMAGEVIEWER);
wcex.lpszClassName = m_szWindowClassName;
wcex.hIconSm = LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_SMALL));
m_hInst = hInstance;
hr = RegisterClassEx(&wcex) ? S_OK : E_FAIL;
}
if (SUCCEEDED(hr))
{
// Create window
HWND hWnd = CreateWindowExW(m_dwExStyle, m_szWindowClassName, m_szTitle, m_dwStyle,
CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, nullptr, nullptr, hInstance, this);
if (hWnd)
{
hr = S_OK;
m_hWnd = hWnd;
ShowWindow(hWnd, nCmdShow);
UpdateWindow(hWnd);
}
else
{
hr = E_FAIL;
}
}
return hr;
}
LRESULT ImageViewer::s_WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
ImageViewer *pThis;
LRESULT lRet = 0;
if (uMsg == WM_NCCREATE)
{
auto pcs = reinterpret_cast<LPCREATESTRUCT> (lParam);
pThis = reinterpret_cast<ImageViewer *> (pcs->lpCreateParams);
SetWindowLongPtr(hWnd, GWLP_USERDATA, reinterpret_cast<LONG_PTR> (pThis));
lRet = DefWindowProc(hWnd, uMsg, wParam, lParam);
}
else
{
pThis = reinterpret_cast<ImageViewer *> (GetWindowLongPtr(hWnd, GWLP_USERDATA));
if (pThis)
{
lRet = pThis->WndProc(uMsg, wParam, lParam);
}
else
{
lRet = DefWindowProc(hWnd, uMsg, wParam, lParam);
}
}
return lRet;
}
LRESULT ImageViewer::WndProc(UINT uMsg, WPARAM wParam, LPARAM lParam)
{
switch (uMsg)
{
case WM_COMMAND:
{
int wmId = LOWORD(wParam);
switch (wmId)
{
case IDM_FILE:
{
if (LocateImageFile() && SUCCEEDED(RenderImage()))
{
InvalidateRect(m_hWnd, nullptr, TRUE);
}
else
{
MessageBox(m_hWnd, L"Failed to load image, select a new one.", L"Application Error", MB_ICONEXCLAMATION | MB_OK);
}
}
break;
case IDM_ABOUT:
DialogBox(m_hInst, MAKEINTRESOURCE(IDD_ABOUTBOX), m_hWnd, About);
break;
case IDM_EXIT:
PostMessage(m_hWnd, WM_CLOSE, 0, 0);
break;
default:
return DefWindowProc(m_hWnd, uMsg, wParam, lParam);
}
}
break;
case WM_DROPFILES:
{
if (DragProc(wParam) && SUCCEEDED(RenderImage()))
{
InvalidateRect(m_hWnd, nullptr, TRUE);
}
else
{
MessageBox(m_hWnd, L"Failed to load image, select a new one.", L"Application Error", MB_ICONEXCLAMATION | MB_OK);
}
}
break;
case WM_SIZE:
{
auto size = D2D1::SizeU(LOWORD(lParam), HIWORD(lParam));
if (m_pRT)
{
// If we couldn't resize, release the device and we'll recreate it
// during the next render pass.
if (FAILED(m_pRT->Resize(size)))
{
SafeRelease(m_pRT);
SafeRelease(m_pD2DBitmap);
}
}
}
break;
case WM_PAINT:
{
return OnPaint();
}
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
default:
return DefWindowProc(m_hWnd, uMsg, wParam, lParam);
}
return 0;
}
HRESULT ImageViewer::RenderImage()
{
HRESULT hr = S_OK;
// Create a decoder
IWICBitmapDecoder *pDecoder = nullptr;
hr = m_pIWICFactory->CreateDecoderFromFilename(
m_szFileName.c_str(), // Image to be decoded
nullptr, // Do not prefer a particular vendor
GENERIC_READ, // Desired read access to the file
WICDecodeMetadataCacheOnDemand, // Cache metadata when needed
&pDecoder // Pointer to the decoder
);
// Retrieve the first frame of the image from the decoder
IWICBitmapFrameDecode *pFrame = nullptr;
if (SUCCEEDED(hr))
{
hr = pDecoder->GetFrame(0, &pFrame);
}
if (SUCCEEDED(hr))
{
RECT rc = { 0 };
BOOL ret = TRUE;
unsigned int nImageWidth, nImageHeight;
pFrame->GetSize(&nImageWidth, &nImageHeight);
rc.right = rc.left + nImageWidth;
rc.bottom = rc.top + nImageHeight;
ret = AdjustWindowRectEx(&rc, m_dwStyle, TRUE, m_dwExStyle);
assert(ret);
int nWindowWidth = rc.right - rc.left;
int nWindowHeight = rc.bottom - rc.top;
int nBorderWidth = nWindowWidth - nImageWidth;
int nBorderHeight = nWindowHeight - nImageHeight;
RECT rcWorkArea = { 0 };
SystemParametersInfo(SPI_GETWORKAREA, 0, &rcWorkArea, 0);
const int nWorkAreaWidth = rcWorkArea.right - rcWorkArea.left;
const int nWorkAreaHeight = rcWorkArea.bottom - rcWorkArea.top;
ret = GetWindowRect(m_hWnd, &rc);
assert(ret);
if (nWindowHeight < nWorkAreaHeight && nWindowWidth < nWorkAreaWidth)
{
if (nWindowHeight < nWorkAreaHeight)
rc.top = rcWorkArea.top;
if (nWindowWidth < nWorkAreaWidth)
rc.left = rcWorkArea.left;
}
else
{
rc.top = rcWorkArea.top;
rc.left = rcWorkArea.left;
if (nWindowHeight > nWorkAreaHeight)
{
nWindowHeight = nWorkAreaHeight;
double fWindowWidth = (double)nImageWidth / (double)nImageHeight * ((double)nWindowHeight - (double)nBorderHeight) + (double)nBorderWidth;
nWindowWidth = (int)fWindowWidth;
}
if (nWindowWidth > nWorkAreaWidth)
{
nWindowWidth = nWorkAreaWidth;
double fWindowHeight = (double)nImageHeight / (double)nImageWidth * ((double)nWindowWidth - (double)nBorderWidth) + (double)nBorderHeight;
nWindowHeight = (int)fWindowHeight;
}
}
ret = MoveWindow(m_hWnd, rc.left, rc.top, nWindowWidth, nWindowHeight, TRUE);
assert(ret);
}
//Format convert the frame to 32bppPBGRA
if (SUCCEEDED(hr))
{
SafeRelease(m_pConvertedSourceBitmap);
hr = m_pIWICFactory->CreateFormatConverter(&m_pConvertedSourceBitmap);
}
if (SUCCEEDED(hr))
{
hr = m_pConvertedSourceBitmap->Initialize(
pFrame, // Input bitmap to convert
GUID_WICPixelFormat32bppPBGRA, // Destination pixel format
WICBitmapDitherTypeNone, // Specified dither pattern
nullptr, // Specify a particular palette
0.f, // Alpha threshold
WICBitmapPaletteTypeCustom // Palette translation type
);
}
//Create render target and D2D bitmap from IWICBitmapSource
if (SUCCEEDED(hr))
{
hr = CreateDeviceResources();
}
if (SUCCEEDED(hr))
{
// Need to release the previous D2DBitmap if there is one
SafeRelease(m_pD2DBitmap);
hr = m_pRT->CreateBitmapFromWicBitmap(m_pConvertedSourceBitmap, nullptr, &m_pD2DBitmap);
}
SafeRelease(pDecoder);
SafeRelease(pFrame);
return hr;
}
bool ImageViewer::LocateImageFile()
{
m_szFileName = L"\\\\?\\";
WCHAR* szFileName = nullptr;
szFileName = new WCHAR[MAX_FILENAME_LENGTH];
ZeroMemory(szFileName, MAX_FILENAME_LENGTH);
OPENFILENAME ofn;
ZeroMemory(&ofn, sizeof(ofn));
ofn.lStructSize = sizeof(ofn);
ofn.hwndOwner = m_hWnd;
ofn.lpstrFilter = L"All Image Files\0" L"*.bmp;*.dib;*.wdp;*.mdp;*.hdp;*.gif;*.png;*.jpg;*.jpeg;*.tif;*.ico\0"
L"Windows Bitmap\0" L"*.bmp;*.dib\0"
L"High Definition Photo\0" L"*.wdp;*.mdp;*.hdp\0"
L"Graphics Interchange Format\0" L"*.gif\0"
L"Portable Network Graphics\0" L"*.png\0"
L"JPEG File Interchange Format\0" L"*.jpg;*.jpeg\0"
L"Tiff File\0" L"*.tif\0"
L"Icon\0" L"*.ico\0"
L"All Files\0" L"*.*\0"
L"\0";
ofn.lpstrFile = szFileName;
ofn.nMaxFile = MAX_FILENAME_LENGTH;
ofn.lpstrTitle = L"Open Image";
ofn.Flags = OFN_FILEMUSTEXIST | OFN_PATHMUSTEXIST;
// Display the Open dialog box.
BOOL ret = GetOpenFileName(&ofn);
if (ret == TRUE)
{
m_szFileName += szFileName;
}
delete[] szFileName;
return ret == TRUE ? true : false;
}
bool ImageViewer::DragProc(WPARAM wParam)
{
HDROP hDrop = (HDROP)wParam;
m_szFileName = L"\\\\?\\";
bool ret = false;
UINT nCount = DragQueryFileW(hDrop, 0xFFFFFFFF, nullptr, 0);
// for (UINT i = 0; i < nCount; i++)
// {
// DragQueryFileW(hDrop, i, szFileName, MAX_FILENAME_LENGTH);
// }
UINT nSize = DragQueryFileW(hDrop, 0, nullptr, 0);
if (nSize > 0)
{
WCHAR* szFileName = nullptr;
szFileName = new WCHAR[nSize + 1];
ZeroMemory(szFileName, nSize + 1);
if (DragQueryFileW(hDrop, 0, szFileName, nSize + 1) > 0)
{
m_szFileName += szFileName;
ret = true;
}
delete[] szFileName;
}
DragFinish(hDrop);
return ret;
}
HRESULT ImageViewer::CreateDeviceResources()
{
HRESULT hr = S_OK;
if (!m_pRT)
{
RECT rc;
hr = GetClientRect(m_hWnd, &rc) ? S_OK : E_FAIL;
if (SUCCEEDED(hr))
{
auto renderTargetProperties = D2D1::RenderTargetProperties();
// Set the DPI to be the default system DPI to allow direct mapping
// between image pixels and desktop pixels in different system DPI settings
renderTargetProperties.dpiX = DEFAULT_DPI;
renderTargetProperties.dpiY = DEFAULT_DPI;
auto size = D2D1::SizeU(rc.right - rc.left, rc.bottom - rc.top);
hr = m_pD2DFactory->CreateHwndRenderTarget(
renderTargetProperties,
D2D1::HwndRenderTargetProperties(m_hWnd, size),
&m_pRT
);
}
}
return hr;
}
LRESULT ImageViewer::OnPaint()
{
HRESULT hr = S_OK;
PAINTSTRUCT ps;
if (BeginPaint(m_hWnd, &ps))
{
// Create render target if not yet created
hr = CreateDeviceResources();
if (SUCCEEDED(hr) && !(m_pRT->CheckWindowState() & D2D1_WINDOW_STATE_OCCLUDED))
{
m_pRT->BeginDraw();
m_pRT->SetTransform(D2D1::Matrix3x2F::Identity());
// Clear the background
m_pRT->Clear(D2D1::ColorF(D2D1::ColorF::White));
auto rtSize = m_pRT->GetSize();
// Create a rectangle with size of current window
auto rectangle = D2D1::RectF(0.0f, 0.0f, rtSize.width, rtSize.height);
// D2DBitmap may have been released due to device loss.
// If so, re-create it from the source bitmap
if (m_pConvertedSourceBitmap && !m_pD2DBitmap)
{
m_pRT->CreateBitmapFromWicBitmap(m_pConvertedSourceBitmap, nullptr, &m_pD2DBitmap);
}
// Draws an image and scales it to the current window size
if (m_pD2DBitmap)
{
m_pRT->DrawBitmap(m_pD2DBitmap, rectangle);
}
hr = m_pRT->EndDraw();
// In case of device loss, discard D2D render target and D2DBitmap
// They will be re-created in the next rendering pass
if (hr == D2DERR_RECREATE_TARGET)
{
SafeRelease(m_pD2DBitmap);
SafeRelease(m_pRT);
// Force a re-render
hr = InvalidateRect(m_hWnd, nullptr, TRUE) ? S_OK : E_FAIL;
}
}
EndPaint(m_hWnd, &ps);
}
return SUCCEEDED(hr) ? 0 : 1;
}