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Diffstat (limited to 'src/platformsupport/fontdatabases/windows/qwindowsnativeimage.cpp')
| -rw-r--r-- | src/platformsupport/fontdatabases/windows/qwindowsnativeimage.cpp | 159 |
1 files changed, 159 insertions, 0 deletions
diff --git a/src/platformsupport/fontdatabases/windows/qwindowsnativeimage.cpp b/src/platformsupport/fontdatabases/windows/qwindowsnativeimage.cpp new file mode 100644 index 0000000000..7022615511 --- /dev/null +++ b/src/platformsupport/fontdatabases/windows/qwindowsnativeimage.cpp @@ -0,0 +1,159 @@ +/**************************************************************************** +** +** Copyright (C) 2016 The Qt Company Ltd. +** Contact: https://www.qt.io/licensing/ +** +** This file is part of the plugins of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** Commercial License Usage +** Licensees holding valid commercial Qt licenses may use this file in +** accordance with the commercial license agreement provided with the +** Software or, alternatively, in accordance with the terms contained in +** a written agreement between you and The Qt Company. For licensing terms +** and conditions see https://www.qt.io/terms-conditions. For further +** information use the contact form at https://www.qt.io/contact-us. +** +** GNU Lesser General Public License Usage +** Alternatively, this file may be used under the terms of the GNU Lesser +** General Public License version 3 as published by the Free Software +** Foundation and appearing in the file LICENSE.LGPL3 included in the +** packaging of this file. Please review the following information to +** ensure the GNU Lesser General Public License version 3 requirements +** will be met: https://www.gnu.org/licenses/lgpl-3.0.html. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU +** General Public License version 2.0 or (at your option) the GNU General +** Public license version 3 or any later version approved by the KDE Free +** Qt Foundation. The licenses are as published by the Free Software +** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3 +** included in the packaging of this file. Please review the following +** information to ensure the GNU General Public License requirements will +** be met: https://www.gnu.org/licenses/gpl-2.0.html and +** https://www.gnu.org/licenses/gpl-3.0.html. +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "qwindowsnativeimage_p.h" + +#include <QtGui/private/qpaintengine_p.h> +#include <QtGui/private/qpaintengine_raster_p.h> + +QT_BEGIN_NAMESPACE + +typedef struct { + BITMAPINFOHEADER bmiHeader; + DWORD redMask; + DWORD greenMask; + DWORD blueMask; +} BITMAPINFO_MASK; + +/*! + \class QWindowsNativeImage + \brief Windows Native image + + Note that size can be 0 (widget autotests with zero size), which + causes CreateDIBSection() to fail. + + \sa QWindowsBackingStore + \internal + \ingroup qt-lighthouse-win +*/ + +static inline HDC createDC() +{ + HDC display_dc = GetDC(0); + HDC hdc = CreateCompatibleDC(display_dc); + ReleaseDC(0, display_dc); + Q_ASSERT(hdc); + return hdc; +} + +static inline HBITMAP createDIB(HDC hdc, int width, int height, + QImage::Format format, + uchar **bitsIn) +{ + BITMAPINFO_MASK bmi; + memset(&bmi, 0, sizeof(bmi)); + bmi.bmiHeader.biSize = sizeof(BITMAPINFOHEADER); + bmi.bmiHeader.biWidth = width; + bmi.bmiHeader.biHeight = -height; // top-down. + bmi.bmiHeader.biPlanes = 1; + bmi.bmiHeader.biSizeImage = 0; + + if (format == QImage::Format_RGB16) { + bmi.bmiHeader.biBitCount = 16; + bmi.bmiHeader.biCompression = BI_BITFIELDS; + bmi.redMask = 0xF800; + bmi.greenMask = 0x07E0; + bmi.blueMask = 0x001F; + } else { + bmi.bmiHeader.biBitCount = 32; + bmi.bmiHeader.biCompression = BI_RGB; + bmi.redMask = 0; + bmi.greenMask = 0; + bmi.blueMask = 0; + } + + uchar *bits = Q_NULLPTR; + HBITMAP bitmap = CreateDIBSection(hdc, reinterpret_cast<BITMAPINFO *>(&bmi), + DIB_RGB_COLORS, reinterpret_cast<void **>(&bits), 0, 0); + if (Q_UNLIKELY(!bitmap || !bits)) + qFatal("%s: CreateDIBSection failed.", __FUNCTION__); + + *bitsIn = bits; + return bitmap; +} + +QWindowsNativeImage::QWindowsNativeImage(int width, int height, + QImage::Format format) : + m_hdc(createDC()), + m_bitmap(0), + m_null_bitmap(0) +{ + if (width != 0 && height != 0) { + uchar *bits; + m_bitmap = createDIB(m_hdc, width, height, format, &bits); + m_null_bitmap = static_cast<HBITMAP>(SelectObject(m_hdc, m_bitmap)); + m_image = QImage(bits, width, height, format); + Q_ASSERT(m_image.paintEngine()->type() == QPaintEngine::Raster); + static_cast<QRasterPaintEngine *>(m_image.paintEngine())->setDC(m_hdc); + } else { + m_image = QImage(width, height, format); + } + + GdiFlush(); +} + +QWindowsNativeImage::~QWindowsNativeImage() +{ + if (m_hdc) { + if (m_bitmap) { + if (m_null_bitmap) + SelectObject(m_hdc, m_null_bitmap); + DeleteObject(m_bitmap); + } + DeleteDC(m_hdc); + } +} + +QImage::Format QWindowsNativeImage::systemFormat() +{ + static int depth = -1; + if (depth == -1) { + if (HDC defaultDC = GetDC(0)) { + depth = GetDeviceCaps(defaultDC, BITSPIXEL); + ReleaseDC(0, defaultDC); + } else { + // FIXME Same remark as in QWindowsFontDatabase::defaultVerticalDPI() + // BONUS FIXME: Is 32 too generous/optimistic? + depth = 32; + } + } + return depth == 16 ? QImage::Format_RGB16 : QImage::Format_RGB32; +} + +QT_END_NAMESPACE |