Integrate the OpenVG graphics system into Qt 4.6

This change also moves the EGL support classes from QtOpenGL to QtGui
so they can be shared between OpenGL and OpenVG.

1 files changed, 344 insertions, 0 deletions

diff --git a/src/openvg/qpixmapdata_vg.cpp b/src/openvg/qpixmapdata_vg.cpp
new file mode 100644
index 0000000000..90fd9a5882
--- /dev/null
+++ b/src/openvg/qpixmapdata_vg.cpp
@@ -0,0 +1,344 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtOpenVG module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at http://www.qtsoftware.com/contact.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qpixmapdata_vg_p.h"
+#include "qpaintengine_vg_p.h"
+#include <QtGui/private/qdrawhelper_p.h>
+#include "qvg_p.h"
+
+QT_BEGIN_NAMESPACE
+
+static int qt_vg_pixmap_serial = 0;
+
+QVGPixmapData::QVGPixmapData(PixelType type)
+    : QPixmapData(type, OpenVGClass)
+{
+    Q_ASSERT(type == QPixmapData::PixmapType);
+    vgImage = VG_INVALID_HANDLE;
+    vgImageOpacity = VG_INVALID_HANDLE;
+    cachedOpacity = 1.0f;
+    recreate = true;
+#if !defined(QT_NO_EGL)
+    context = 0;
+#endif
+    setSerialNumber(++qt_vg_pixmap_serial);
+}
+
+QVGPixmapData::~QVGPixmapData()
+{
+    if (vgImage != VG_INVALID_HANDLE) {
+        // We need to have a context current to destroy the image.
+#if !defined(QT_NO_EGL)
+        if (context->isCurrent()) {
+            vgDestroyImage(vgImage);
+            if (vgImageOpacity != VG_INVALID_HANDLE)
+                vgDestroyImage(vgImageOpacity);
+        } else {
+            // We don't currently have a widget surface active, but we
+            // need a surface to make the context current.  So use the
+            // shared pbuffer surface instead.
+            qt_vg_make_current(context, qt_vg_shared_surface());
+            vgDestroyImage(vgImage);
+            if (vgImageOpacity != VG_INVALID_HANDLE)
+                vgDestroyImage(vgImageOpacity);
+            qt_vg_done_current(context);
+            context->setSurface(EGL_NO_SURFACE);
+        }
+#else
+        vgDestroyImage(vgImage);
+        if (vgImageOpacity != VG_INVALID_HANDLE)
+            vgDestroyImage(vgImageOpacity);
+        } else {
+#endif
+    }
+#if !defined(QT_NO_EGL)
+    if (context)
+        qt_vg_destroy_context(context);
+#endif
+}
+
+bool QVGPixmapData::isValid() const
+{
+    return (w > 0 && h > 0);
+}
+
+void QVGPixmapData::resize(int wid, int ht)
+{
+    if (w == wid && h == ht)
+        return;
+
+    w = wid;
+    h = ht;
+    d = 32; // We always use ARGB_Premultiplied for VG pixmaps.
+    is_null = (w <= 0 || h <= 0);
+    source = QImage();
+    recreate = true;
+
+    setSerialNumber(++qt_vg_pixmap_serial);
+}
+
+void QVGPixmapData::fromImage
+        (const QImage &image, Qt::ImageConversionFlags flags)
+{
+    if (image.size() == QSize(w, h))
+        setSerialNumber(++qt_vg_pixmap_serial);
+    else
+        resize(image.width(), image.height());
+    source = image.convertToFormat(sourceFormat(), flags);
+    recreate = true;
+}
+
+void QVGPixmapData::fill(const QColor &color)
+{
+    if (!isValid())
+        return;
+
+    if (source.isNull())
+        source = QImage(w, h, sourceFormat());
+
+    if (source.depth() == 1) {
+        // Pick the best approximate color in the image's colortable.
+        int gray = qGray(color.rgba());
+        if (qAbs(qGray(source.color(0)) - gray) < qAbs(qGray(source.color(1)) - gray))
+            source.fill(0);
+        else
+            source.fill(1);
+    } else {
+        source.fill(PREMUL(color.rgba()));
+    }
+
+    // Re-upload the image to VG the next time toVGImage() is called.
+    recreate = true;
+}
+
+bool QVGPixmapData::hasAlphaChannel() const
+{
+    if (!source.isNull())
+        return source.hasAlphaChannel();
+    else
+        return isValid();
+}
+
+void QVGPixmapData::setAlphaChannel(const QPixmap &alphaChannel)
+{
+    forceToImage();
+    source.setAlphaChannel(alphaChannel.toImage());
+}
+
+QImage QVGPixmapData::toImage() const
+{
+    if (!isValid())
+        return QImage();
+
+    if (source.isNull()) {
+        source = QImage(w, h, sourceFormat());
+        recreate = true;
+    }
+
+    return source;
+}
+
+QImage *QVGPixmapData::buffer()
+{
+    forceToImage();
+    return &source;
+}
+
+QPaintEngine* QVGPixmapData::paintEngine() const
+{
+    // If the application wants to paint into the QPixmap, we first
+    // force it to QImage format and then paint into that.
+    // This is simpler than juggling multiple VG contexts.
+    const_cast<QVGPixmapData *>(this)->forceToImage();
+    return source.paintEngine();
+}
+
+VGImage QVGPixmapData::toVGImage()
+{
+    if (!isValid())
+        return VG_INVALID_HANDLE;
+
+#if !defined(QT_NO_EGL)
+    // Increase the reference count on the shared context.
+    if (!context)
+        context = qt_vg_create_context(0);
+#endif
+
+    if (recreate) {
+        if (vgImage != VG_INVALID_HANDLE) {
+            vgDestroyImage(vgImage);
+            vgImage = VG_INVALID_HANDLE;
+        }
+        if (vgImageOpacity != VG_INVALID_HANDLE) {
+            vgDestroyImage(vgImageOpacity);
+            vgImageOpacity = VG_INVALID_HANDLE;
+        }
+    }
+
+    if (vgImage == VG_INVALID_HANDLE) {
+        vgImage = vgCreateImage
+            (VG_sARGB_8888_PRE, w, h, VG_IMAGE_QUALITY_FASTER);
+    }
+
+    if (!source.isNull() && recreate) {
+        vgImageSubData
+            (vgImage,
+             source.bits(), source.bytesPerLine(),
+             VG_sARGB_8888_PRE, 0, 0, w, h);
+    }
+
+    recreate = false;
+
+    return vgImage;
+}
+
+VGImage QVGPixmapData::toVGImage(qreal opacity)
+{
+#if !defined(QT_SHIVAVG)
+    if (!isValid())
+        return VG_INVALID_HANDLE;
+
+#if !defined(QT_NO_EGL)
+    // Increase the reference count on the shared context.
+    if (!context)
+        context = qt_vg_create_context(0);
+#endif
+
+    if (recreate) {
+        if (vgImage != VG_INVALID_HANDLE) {
+            vgDestroyImage(vgImage);
+            vgImage = VG_INVALID_HANDLE;
+        }
+        if (vgImageOpacity != VG_INVALID_HANDLE) {
+            vgDestroyImage(vgImageOpacity);
+            vgImageOpacity = VG_INVALID_HANDLE;
+        }
+    }
+
+    if (vgImage == VG_INVALID_HANDLE) {
+        vgImage = vgCreateImage
+            (VG_sARGB_8888_PRE, w, h, VG_IMAGE_QUALITY_FASTER);
+    }
+
+    if (!source.isNull() && recreate) {
+        vgImageSubData
+            (vgImage,
+             source.bits(), source.bytesPerLine(),
+             VG_sARGB_8888_PRE, 0, 0, w, h);
+    }
+
+    recreate = false;
+
+    if (opacity == 1.0f)
+        return vgImage;
+
+    if (vgImageOpacity == VG_INVALID_HANDLE || cachedOpacity != opacity) {
+        if (vgImageOpacity == VG_INVALID_HANDLE) {
+            vgImageOpacity = vgCreateImage
+                (VG_sARGB_8888_PRE, w, h, VG_IMAGE_QUALITY_FASTER);
+        }
+        VGfloat matrix[20] = {
+            1.0f, 0.0f, 0.0f, 0.0f,
+            0.0f, 1.0f, 0.0f, 0.0f,
+            0.0f, 0.0f, 1.0f, 0.0f,
+            0.0f, 0.0f, 0.0f, opacity,
+            0.0f, 0.0f, 0.0f, 0.0f
+        };
+        vgColorMatrix(vgImageOpacity, vgImage, matrix);
+        cachedOpacity = opacity;
+    }
+
+    return vgImageOpacity;
+#else
+    // vgColorMatrix() doesn't work with ShivaVG, so ignore the opacity.
+    Q_UNUSED(opacity);
+    return toVGImage();
+#endif
+}
+
+extern int qt_defaultDpiX();
+extern int qt_defaultDpiY();
+
+int QVGPixmapData::metric(QPaintDevice::PaintDeviceMetric metric) const
+{
+    switch (metric) {
+    case QPaintDevice::PdmWidth:
+        return w;
+    case QPaintDevice::PdmHeight:
+        return h;
+    case QPaintDevice::PdmNumColors:
+        return 0;
+    case QPaintDevice::PdmDepth:
+        return d;
+    case QPaintDevice::PdmWidthMM:
+        return qRound(w * 25.4 / qt_defaultDpiX());
+    case QPaintDevice::PdmHeightMM:
+        return qRound(h * 25.4 / qt_defaultDpiY());
+    case QPaintDevice::PdmDpiX:
+    case QPaintDevice::PdmPhysicalDpiX:
+        return qt_defaultDpiX();
+    case QPaintDevice::PdmDpiY:
+    case QPaintDevice::PdmPhysicalDpiY:
+        return qt_defaultDpiY();
+    default:
+        qWarning("QVGPixmapData::metric(): Invalid metric");
+        return 0;
+    }
+}
+
+// Force the pixmap data to be in QImage format.
+void QVGPixmapData::forceToImage()
+{
+    if (!isValid())
+        return;
+
+    if (source.isNull())
+        source = QImage(w, h, sourceFormat());
+
+    recreate = true;
+}
+
+QImage::Format QVGPixmapData::sourceFormat() const
+{
+    return QImage::Format_ARGB32_Premultiplied;
+}
+
+QT_END_NAMESPACE