src/windows/native/sun/windows/awt_DCHolder.cpp

/*
 * Copyright (c) 2009, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code 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
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 */

#include "awt.h"
#include "awt_ole.h"
#include "awt_DCHolder.h"       // main symbols


////////////////////////
// struct DCHolder

DCHolder::DCHolder()
: m_hMemoryDC(NULL),
    m_iWidth(0),
    m_iHeight(0),
    m_bForImage(FALSE),
    m_hBitmap(NULL),
    m_hOldBitmap(NULL),
    m_pPoints(NULL)
{}

void DCHolder::Create(
    HDC hRelDC,
    int iWidth,
    int iHeght,
    BOOL bForImage
){
    OLE_DECL
    m_iWidth = iWidth;
    m_iHeight = iHeght;
    m_bForImage = bForImage;
    m_hMemoryDC = ::CreateCompatibleDC(hRelDC);
    //NB: can not throw an error in non-safe stack!!! Just conversion and logging!
    //OLE_WINERROR2HR just set OLE_HR without any throw!
    if (!m_hMemoryDC) {
        OLE_THROW_LASTERROR(_T("CreateCompatibleDC"))
    }
    m_hBitmap = m_bForImage
        ? CreateJavaContextBitmap(hRelDC, m_iWidth, m_iHeight, &m_pPoints)
        : ::CreateCompatibleBitmap(hRelDC, m_iWidth, m_iHeight);
    if (!m_hBitmap) {
        OLE_THROW_LASTERROR(_T("CreateCompatibleBitmap"))
    }
    m_hOldBitmap = (HBITMAP)::SelectObject(m_hMemoryDC, m_hBitmap);
    if (!m_hOldBitmap) {
        OLE_THROW_LASTERROR(_T("SelectBMObject"))
    }
}

DCHolder::~DCHolder(){
    if (m_hOldBitmap) {
        ::SelectObject(m_hMemoryDC, m_hOldBitmap);
    }
    if (m_hBitmap) {
        ::DeleteObject(m_hBitmap);
    }
    if (m_hMemoryDC) {
        ::DeleteDC(m_hMemoryDC);
    }
};


HBITMAP DCHolder::CreateJavaContextBitmap(
    HDC hdc,
    int iWidth,
    int iHeight,
    void **ppPoints)
{
    BITMAPINFO    bitmapInfo = {0};
    bitmapInfo.bmiHeader.biWidth = iWidth;
    bitmapInfo.bmiHeader.biHeight = -iHeight;
    bitmapInfo.bmiHeader.biPlanes = 1;
    bitmapInfo.bmiHeader.biBitCount = 32;
    bitmapInfo.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
    bitmapInfo.bmiHeader.biCompression = BI_RGB;

    return ::CreateDIBSection(
        hdc,
        (BITMAPINFO *)&bitmapInfo,
        DIB_RGB_COLORS,
        (void **)ppPoints,
        NULL,
        0
    );
}