Long live Qt!

1 files changed, 321 insertions, 0 deletions

diff --git a/src/opengl/qpixmapdata_gl.cpp b/src/opengl/qpixmapdata_gl.cpp
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+++ b/src/opengl/qpixmapdata_gl.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the QtOpenGL 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 qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qpixmap.h"
+
+#include <private/qpaintengine_raster_p.h>
+
+#include "qpixmapdata_gl_p.h"
+
+#include <private/qgl_p.h>
+#include <private/qdrawhelper_p.h>
+
+QT_BEGIN_NAMESPACE
+
+extern QGLWidget* qt_gl_share_widget();
+
+class QGLShareContextScope
+{
+public:
+    QGLShareContextScope(const QGLContext *ctx)
+        : m_oldContext(0)
+        , m_ctx(const_cast<QGLContext *>(ctx))
+    {
+        const QGLContext *currentContext = QGLContext::currentContext();
+        if (currentContext != ctx && !qgl_share_reg()->checkSharing(ctx, currentContext)) {
+            m_oldContext = const_cast<QGLContext *>(currentContext);
+            m_ctx->makeCurrent();
+        }
+    }
+
+    operator QGLContext *()
+    {
+        return m_ctx;
+    }
+
+    QGLContext *operator->()
+    {
+        return m_ctx;
+    }
+
+    ~QGLShareContextScope()
+    {
+        if (m_oldContext)
+            m_oldContext->makeCurrent();
+    }
+
+private:
+    QGLContext *m_oldContext;
+    QGLContext *m_ctx;
+};
+
+void qt_gl_convertFromGLImage(QImage *img)
+{
+    const int w = img->width();
+    const int h = img->height();
+
+    if (QSysInfo::ByteOrder == QSysInfo::BigEndian) {
+        uint *p = (uint*)img->bits();
+        uint *end = p + w*h;
+
+        while (p < end) {
+            uint a = *p << 24;
+            *p = (*p >> 8) | a;
+            p++;
+        }
+
+        *img = img->mirrored();
+    } else {
+        // mirror image
+        uint *data = (uint *)img->bits();
+
+        const int mid = h/2;
+
+        for (int y = 0; y < mid; ++y) {
+            uint *p = data + y * w;
+            uint *end = p + w;
+            uint *q = data + (h - y - 1) * w;
+
+            while (p < end)
+                qSwap(*p++, *q++);
+        }
+    }
+}
+
+
+static int qt_gl_pixmap_serial = 0;
+
+QGLPixmapData::QGLPixmapData(PixelType type)
+    : QPixmapData(type, OpenGLClass)
+    , m_width(0)
+    , m_height(0)
+    , m_texture(0)
+    , m_dirty(false)
+{
+    setSerialNumber(++qt_gl_pixmap_serial);
+}
+
+QGLPixmapData::~QGLPixmapData()
+{
+    if (m_texture && qt_gl_share_widget()) {
+        QGLShareContextScope ctx(qt_gl_share_widget()->context());
+        glDeleteTextures(1, &m_texture);
+    }
+}
+
+bool QGLPixmapData::isValid() const
+{
+    return m_width > 0 && m_height > 0;
+}
+
+bool QGLPixmapData::isValidContext(const QGLContext *ctx) const
+{
+    const QGLContext *share_ctx = qt_gl_share_widget()->context();
+    return ctx == share_ctx || qgl_share_reg()->checkSharing(ctx, share_ctx);
+}
+
+void QGLPixmapData::resize(int width, int height)
+{
+    if (width == m_width && height == m_height)
+        return;
+
+    m_width = width;
+    m_height = height;
+
+    m_source = QImage();
+    m_dirty = isValid();
+    setSerialNumber(++qt_gl_pixmap_serial);
+}
+
+void QGLPixmapData::ensureCreated() const
+{
+    if (!m_dirty)
+        return;
+
+    m_dirty = false;
+
+    QGLShareContextScope ctx(qt_gl_share_widget()->context());
+
+    const GLenum format = qt_gl_preferredTextureFormat();
+    const GLenum target = qt_gl_preferredTextureTarget();
+
+    if (!m_texture)
+        glGenTextures(1, &m_texture);
+
+    glBindTexture(target, m_texture);
+
+    if (m_source.isNull()) {
+        glTexImage2D(target, 0, GL_RGBA, m_width, m_height, 0, format, GL_UNSIGNED_BYTE, 0);
+    } else {
+        const QImage tx = ctx->d_func()->convertToGLFormat(m_source, true, format);
+
+        glBindTexture(target, m_texture);
+        glTexImage2D(target, 0, GL_RGBA, m_width, m_height, 0, format,
+                GL_UNSIGNED_BYTE, tx.bits());
+
+        m_source = QImage();
+    }
+}
+
+void QGLPixmapData::fromImage(const QImage &image,
+                              Qt::ImageConversionFlags)
+{
+    if (image.size() == QSize(m_width, m_height))
+        setSerialNumber(++qt_gl_pixmap_serial);
+    resize(image.width(), image.height());
+    m_source = image;
+    m_dirty = true;
+}
+
+bool QGLPixmapData::scroll(int dx, int dy, const QRect &rect)
+{
+    Q_UNUSED(dx);
+    Q_UNUSED(dy);
+    Q_UNUSED(rect);
+    return false;
+}
+
+void QGLPixmapData::fill(const QColor &color)
+{
+    if (!isValid())
+        return;
+
+    if (!m_source.isNull()) {
+        m_source.fill(PREMUL(color.rgba()));
+    } else {
+        // ## TODO: improve performance here
+        QImage img(m_width, m_height, QImage::Format_ARGB32_Premultiplied);
+        img.fill(PREMUL(color.rgba()));
+
+        fromImage(img, 0);
+    }
+}
+
+bool QGLPixmapData::hasAlphaChannel() const
+{
+    return true;
+}
+
+QImage QGLPixmapData::toImage() const
+{
+    if (!isValid())
+        return QImage();
+
+    if (!m_source.isNull())
+        return m_source;
+    else if (m_dirty)
+        return QImage(m_width, m_height, QImage::Format_ARGB32_Premultiplied);
+
+    ensureCreated();
+
+    QGLShareContextScope ctx(qt_gl_share_widget()->context());
+    QImage img(m_width, m_height, QImage::Format_ARGB32_Premultiplied);
+
+    GLenum format = qt_gl_preferredTextureFormat();
+    GLenum target = qt_gl_preferredTextureTarget();
+
+    glBindTexture(target, m_texture);
+#ifndef QT_OPENGL_ES
+    glGetTexImage(target, 0, format, GL_UNSIGNED_BYTE, img.bits());
+#else
+    // XXX - cannot download textures this way on OpenGL/ES.
+#endif
+
+    qt_gl_convertFromGLImage(&img);
+
+    return img;
+}
+
+QPaintEngine* QGLPixmapData::paintEngine() const
+{
+    if (!isValid())
+        return 0;
+
+    m_source = toImage();
+    m_dirty = true;
+
+    return m_source.paintEngine();
+}
+
+GLuint QGLPixmapData::bind() const
+{
+    ensureCreated();
+    glBindTexture(qt_gl_preferredTextureTarget(), m_texture);
+    return m_texture;
+}
+
+GLuint QGLPixmapData::textureId() const
+{
+    ensureCreated();
+    return m_texture;
+}
+
+extern int qt_defaultDpiX();
+extern int qt_defaultDpiY();
+
+int QGLPixmapData::metric(QPaintDevice::PaintDeviceMetric metric) const
+{
+    switch (metric) {
+    case QPaintDevice::PdmWidth:
+        return m_width;
+    case QPaintDevice::PdmHeight:
+        return m_height;
+    case QPaintDevice::PdmNumColors:
+        return 0;
+    case QPaintDevice::PdmDepth:
+        return pixelType() == QPixmapData::PixmapType ? 32 : 1;
+    case QPaintDevice::PdmWidthMM:
+        return qRound(m_width * 25.4 / qt_defaultDpiX());
+    case QPaintDevice::PdmHeightMM:
+        return qRound(m_height * 25.4 / qt_defaultDpiY());
+    case QPaintDevice::PdmDpiX:
+    case QPaintDevice::PdmPhysicalDpiX:
+        return qt_defaultDpiX();
+    case QPaintDevice::PdmDpiY:
+    case QPaintDevice::PdmPhysicalDpiY:
+        return qt_defaultDpiY();
+    default:
+        qWarning("QGLPixmapData::metric(): Invalid metric");
+        return 0;
+    }
+}
+
+QT_END_NAMESPACE