deskflow/src/lib/platform/MSWindowsClipboardBitmapConverter.cpp

/*
 * synergy -- mouse and keyboard sharing utility
 * Copyright (C) 2012-2016 Symless Ltd.
 * Copyright (C) 2004 Chris Schoeneman
 * 
 * This package is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * found in the file LICENSE that should have accompanied this file.
 * 
 * This package is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "platform/MSWindowsClipboardBitmapConverter.h"

#include "base/Log.h"

//
// MSWindowsClipboardBitmapConverter
//

MSWindowsClipboardBitmapConverter::MSWindowsClipboardBitmapConverter()
{
	// do nothing
}

MSWindowsClipboardBitmapConverter::~MSWindowsClipboardBitmapConverter()
{
	// do nothing
}

IClipboard::EFormat
MSWindowsClipboardBitmapConverter::getFormat() const
{
	return IClipboard::kBitmap;
}

UINT
MSWindowsClipboardBitmapConverter::getWin32Format() const
{
	return CF_DIB;
}

HANDLE
MSWindowsClipboardBitmapConverter::fromIClipboard(const String& data) const
{
	// copy to memory handle
	HGLOBAL gData = GlobalAlloc(GMEM_MOVEABLE | GMEM_DDESHARE, data.size());
	if (gData != NULL) {
		// get a pointer to the allocated memory
		char* dst = (char*)GlobalLock(gData);
		if (dst != NULL) {
			memcpy(dst, data.data(), data.size());
			GlobalUnlock(gData);
		}
		else {
			GlobalFree(gData);
			gData = NULL;
		}
	}

	return gData;
}

String
MSWindowsClipboardBitmapConverter::toIClipboard(HANDLE data) const
{
	// get datator
	const char* src = (const char*)GlobalLock(data);
	if (src == NULL) {
		return String();
	}
	UInt32 srcSize = (UInt32)GlobalSize(data);

	// check image type
	const BITMAPINFO* bitmap = static_cast<const BITMAPINFO*>(src);
	LOG((CLOG_INFO "bitmap: %dx%d %d", bitmap->bmiHeader.biWidth, bitmap->bmiHeader.biHeight, (int)bitmap->bmiHeader.biBitCount));
	if (bitmap->bmiHeader.biPlanes == 1 &&
		(bitmap->bmiHeader.biBitCount == 24 ||
		bitmap->bmiHeader.biBitCount == 32) &&
		bitmap->bmiHeader.biCompression == BI_RGB) {
		// already in canonical form
		String image(src, srcSize);
		GlobalUnlock(data);
		return image;
	}

	// create a destination DIB section
	LOG((CLOG_INFO "convert image from: depth=%d comp=%d", bitmap->bmiHeader.biBitCount, bitmap->bmiHeader.biCompression));
	void* raw;
	BITMAPINFOHEADER info;
	LONG w               = bitmap->bmiHeader.biWidth;
	LONG h               = bitmap->bmiHeader.biHeight;
	info.biSize          = sizeof(BITMAPINFOHEADER);
	info.biWidth         = w;
	info.biHeight        = h;
	info.biPlanes        = 1;
	info.biBitCount      = 32;
	info.biCompression   = BI_RGB;
	info.biSizeImage     = 0;
	info.biXPelsPerMeter = 1000;
	info.biYPelsPerMeter = 1000;
	info.biClrUsed       = 0;
	info.biClrImportant  = 0;
	HDC dc      = GetDC(NULL);
	HBITMAP dst = CreateDIBSection(dc, (BITMAPINFO*)&info,
							DIB_RGB_COLORS, &raw, NULL, 0);

	// find the start of the pixel data
	const char* srcBits = (const char*)bitmap + bitmap->bmiHeader.biSize;
	if (bitmap->bmiHeader.biBitCount >= 16) {
		if (bitmap->bmiHeader.biCompression == BI_BITFIELDS &&
			(bitmap->bmiHeader.biBitCount == 16 ||
			bitmap->bmiHeader.biBitCount == 32)) {
			srcBits += 3 * sizeof(DWORD);
		}
	}
	else if (bitmap->bmiHeader.biClrUsed != 0) {
		srcBits += bitmap->bmiHeader.biClrUsed * sizeof(RGBQUAD);
	}
	else {
		//http://msdn.microsoft.com/en-us/library/ke55d167(VS.80).aspx
		srcBits += (1i64 << bitmap->bmiHeader.biBitCount) * sizeof(RGBQUAD);
	}

	// copy source image to destination image
	HDC dstDC         = CreateCompatibleDC(dc);
	HGDIOBJ oldBitmap = SelectObject(dstDC, dst);
	SetDIBitsToDevice(dstDC, 0, 0, w, h, 0, 0, 0, h,
							srcBits, bitmap, DIB_RGB_COLORS);
	SelectObject(dstDC, oldBitmap);
	DeleteDC(dstDC);
	GdiFlush();

	// extract data
	String image((const char*)&info, info.biSize);
	image.append((const char*)raw, 4 * w * h);

	// clean up GDI
	DeleteObject(dst);
	ReleaseDC(NULL, dc);

	// release handle
	GlobalUnlock(data);

	return image;
}