Make QOpenGLTextureBlitter public

Change QOpenGLTextureBlitter to be a public API, as it was originally intended.
There are now significant external uses outside qtbase (C++ compositor examples
in QtWayland), and the API is considered proven enough.

[ChangeLog][QtGui] QOpenGLTextureBlitter, a utility class to draw textured quads,
has been made public.

Change-Id: If7a2c94e1494195e2aa375d214932fa7b4c78321
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@qt.io>

1 files changed, 94 insertions, 0 deletions

diff --git a/src/gui/opengl/qopengltextureblitter.h b/src/gui/opengl/qopengltextureblitter.h
new file mode 100644
index 0000000000..2f7c6b1a0a
--- /dev/null
+++ b/src/gui/opengl/qopengltextureblitter.h
@@ -0,0 +1,94 @@
+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtGui module 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.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QOPENGLTEXTUREBLITTER_H
+#define QOPENGLTEXTUREBLITTER_H
+
+#include <QtGui/qtguiglobal.h>
+
+#ifndef QT_NO_OPENGL
+
+#include <QtGui/qopengl.h>
+#include <QtGui/QMatrix3x3>
+#include <QtGui/QMatrix4x4>
+
+QT_BEGIN_NAMESPACE
+
+class QOpenGLTextureBlitterPrivate;
+
+class Q_GUI_EXPORT QOpenGLTextureBlitter
+{
+public:
+    QOpenGLTextureBlitter();
+    ~QOpenGLTextureBlitter();
+
+    enum Origin {
+        OriginBottomLeft,
+        OriginTopLeft
+    };
+
+    bool create();
+    bool isCreated() const;
+    void destroy();
+
+    bool supportsExternalOESTarget() const;
+
+    void bind(GLenum target = GL_TEXTURE_2D);
+    void release();
+
+    void setRedBlueSwizzle(bool swizzle);
+    void setOpacity(float opacity);
+
+    void blit(GLuint texture, const QMatrix4x4 &targetTransform, Origin sourceOrigin);
+    void blit(GLuint texture, const QMatrix4x4 &targetTransform, const QMatrix3x3 &sourceTransform);
+
+    static QMatrix4x4 targetTransform(const QRectF &target, const QRect &viewport);
+    static QMatrix3x3 sourceTransform(const QRectF &subTexture, const QSize &textureSize, Origin origin);
+
+private:
+    Q_DISABLE_COPY(QOpenGLTextureBlitter)
+    Q_DECLARE_PRIVATE(QOpenGLTextureBlitter)
+    QScopedPointer<QOpenGLTextureBlitterPrivate> d_ptr;
+};
+
+QT_END_NAMESPACE
+
+#endif
+
+#endif //QOPENGLTEXTUREBLITTER_H