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/* SPDX-License-Identifier: GPL-2.0-or-later */
/** \file
* \ingroup blendthumb
*
* Thumbnail from Blend file extraction for MS-Windows.
*/
#include <math.h>
#include <new>
#include <shlwapi.h>
#include <string>
#include <thumbcache.h> /* for #IThumbnailProvider */
#include "Wincodec.h"
#include "blendthumb.hh"
#include "BLI_filereader.h"
#pragma comment(lib, "shlwapi.lib")
/**
* This thumbnail provider implements #IInitializeWithStream to enable being hosted
* in an isolated process for robustness.
*/
class CBlendThumb : public IInitializeWithStream, public IThumbnailProvider {
public:
CBlendThumb() : _cRef(1), _pStream(NULL)
{
}
virtual ~CBlendThumb()
{
if (_pStream) {
_pStream->Release();
}
}
IFACEMETHODIMP QueryInterface(REFIID riid, void **ppv)
{
static const QITAB qit[] = {
QITABENT(CBlendThumb, IInitializeWithStream),
QITABENT(CBlendThumb, IThumbnailProvider),
{0},
};
return QISearch(this, qit, riid, ppv);
}
IFACEMETHODIMP_(ULONG) AddRef()
{
return InterlockedIncrement(&_cRef);
}
IFACEMETHODIMP_(ULONG) Release()
{
ULONG cRef = InterlockedDecrement(&_cRef);
if (!cRef) {
delete this;
}
return cRef;
}
/** IInitializeWithStream */
IFACEMETHODIMP Initialize(IStream *pStream, DWORD grfMode);
/** IThumbnailProvider */
IFACEMETHODIMP GetThumbnail(UINT cx, HBITMAP *phbmp, WTS_ALPHATYPE *pdwAlpha);
private:
long _cRef;
IStream *_pStream; /* provided in Initialize(). */
};
HRESULT CBlendThumb_CreateInstance(REFIID riid, void **ppv)
{
CBlendThumb *pNew = new (std::nothrow) CBlendThumb();
HRESULT hr = pNew ? S_OK : E_OUTOFMEMORY;
if (SUCCEEDED(hr)) {
hr = pNew->QueryInterface(riid, ppv);
pNew->Release();
}
return hr;
}
IFACEMETHODIMP CBlendThumb::Initialize(IStream *pStream, DWORD)
{
if (_pStream != NULL) {
/* Can only be initialized once. */
return E_UNEXPECTED;
}
/* Take a reference to the stream. */
return pStream->QueryInterface(&_pStream);
}
/**
* #FileReader compatible wrapper around the Windows stream that gives access to the .blend file.
*/
typedef struct {
FileReader reader;
IStream *_pStream;
} StreamReader;
static ssize_t stream_read(FileReader *reader, void *buffer, size_t size)
{
StreamReader *stream = (StreamReader *)reader;
ULONG readsize;
stream->_pStream->Read(buffer, size, &readsize);
stream->reader.offset += readsize;
return ssize_t(readsize);
}
static off64_t stream_seek(FileReader *reader, off64_t offset, int whence)
{
StreamReader *stream = (StreamReader *)reader;
DWORD origin = STREAM_SEEK_SET;
switch (whence) {
case SEEK_CUR:
origin = STREAM_SEEK_CUR;
break;
case SEEK_END:
origin = STREAM_SEEK_END;
break;
}
LARGE_INTEGER offsetI;
offsetI.QuadPart = offset;
ULARGE_INTEGER newPos;
stream->_pStream->Seek(offsetI, origin, &newPos);
stream->reader.offset = newPos.QuadPart;
return stream->reader.offset;
}
static void stream_close(FileReader *reader)
{
StreamReader *stream = (StreamReader *)reader;
delete stream;
}
IFACEMETHODIMP CBlendThumb::GetThumbnail(UINT cx, HBITMAP *phbmp, WTS_ALPHATYPE *pdwAlpha)
{
HRESULT hr = S_FALSE;
StreamReader *file = new StreamReader;
file->reader.read = stream_read;
file->reader.seek = stream_seek;
file->reader.close = stream_close;
file->reader.offset = 0;
file->_pStream = _pStream;
file->reader.seek(&file->reader, 0, SEEK_SET);
/* Extract thumbnail from stream. */
Thumbnail thumb;
if (blendthumb_create_thumb_from_file(&file->reader, &thumb) != BT_OK) {
return S_FALSE;
}
/* Convert to BGRA for Windows. */
for (int i = 0; i < thumb.width * thumb.height; i++) {
std::swap(thumb.data[4 * i], thumb.data[4 * i + 2]);
}
*phbmp = CreateBitmap(thumb.width, thumb.height, 1, 32, thumb.data.data());
if (!*phbmp) {
return E_FAIL;
}
*pdwAlpha = WTSAT_ARGB;
/* Scale up the thumbnail if required. */
if (uint(thumb.width) < cx && uint(thumb.height) < cx) {
float scale = 1.0f / (std::max(thumb.width, thumb.height) / float(cx));
LONG NewWidth = LONG(thumb.width * scale);
LONG NewHeight = LONG(thumb.height * scale);
IWICImagingFactory *pImgFac;
hr = CoCreateInstance(
CLSID_WICImagingFactory, NULL, CLSCTX_INPROC_SERVER, IID_PPV_ARGS(&pImgFac));
IWICBitmap *WICBmp;
hr = pImgFac->CreateBitmapFromHBITMAP(*phbmp, 0, WICBitmapUseAlpha, &WICBmp);
BITMAPINFO bmi = {};
bmi.bmiHeader.biSize = sizeof(bmi.bmiHeader);
bmi.bmiHeader.biWidth = NewWidth;
bmi.bmiHeader.biHeight = -NewHeight;
bmi.bmiHeader.biPlanes = 1;
bmi.bmiHeader.biBitCount = 32;
bmi.bmiHeader.biCompression = BI_RGB;
BYTE *pBits;
HBITMAP ResizedHBmp = CreateDIBSection(NULL, &bmi, DIB_RGB_COLORS, (void **)&pBits, NULL, 0);
hr = ResizedHBmp ? S_OK : E_OUTOFMEMORY;
if (SUCCEEDED(hr)) {
IWICBitmapScaler *pIScaler;
hr = pImgFac->CreateBitmapScaler(&pIScaler);
hr = pIScaler->Initialize(WICBmp, NewWidth, NewHeight, WICBitmapInterpolationModeFant);
WICRect rect = {0, 0, NewWidth, NewHeight};
hr = pIScaler->CopyPixels(&rect, NewWidth * 4, NewWidth * NewHeight * 4, pBits);
if (SUCCEEDED(hr)) {
DeleteObject(*phbmp);
*phbmp = ResizedHBmp;
}
else {
DeleteObject(ResizedHBmp);
}
pIScaler->Release();
}
WICBmp->Release();
pImgFac->Release();
}
else {
hr = S_OK;
}
return hr;
}
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