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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#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
*/
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 = 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 (%dx%d, format: %d)", __FUNCTION__,
width, height, int(format));
}
*bitsIn = bits;
return bitmap;
}
QWindowsNativeImage::QWindowsNativeImage(int width, int height,
QImage::Format format) :
m_hdc(createDC())
{
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
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