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+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtQuick 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 QSGOPENGLATLASTEXTURE_P_H
+#define QSGOPENGLATLASTEXTURE_P_H
+
+//
+// W A R N I N G
+// -------------
+//
+// This file is not part of the Qt API. It exists purely as an
+// implementation detail. This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include <QtCore/QSize>
+
+#include <QtGui/qopengl.h>
+
+#include <QtQuick/QSGTexture>
+#include <QtQuick/private/qsgplaintexture_p.h>
+#include <QtQuick/private/qsgareaallocator_p.h>
+
+QT_BEGIN_NAMESPACE
+
+namespace QSGCompressedAtlasTexture {
+ class Atlas;
+}
+class QSGCompressedTextureFactory;
+
+namespace QSGOpenGLAtlasTexture
+{
+
+class Texture;
+class TextureBase;
+class Atlas;
+
+class Manager : public QObject
+{
+ Q_OBJECT
+
+public:
+ Manager(const QSize &surfacePixelSize);
+ ~Manager();
+
+ QSGTexture *create(const QImage &image, bool hasAlphaChannel);
+ QSGTexture *create(const QSGCompressedTextureFactory *factory);
+ void invalidate();
+
+private:
+ Atlas *m_atlas;
+ // set of atlases for different compressed formats
+ QHash<unsigned int, QSGCompressedAtlasTexture::Atlas*> m_atlases;
+
+ QSize m_atlas_size;
+ int m_atlas_size_limit;
+};
+
+class AtlasBase : public QObject
+{
+ Q_OBJECT
+public:
+ AtlasBase(const QSize &size);
+ ~AtlasBase();
+
+ void invalidate();
+
+ int textureId() const;
+ void bind(QSGTexture::Filtering filtering);
+
+ void remove(TextureBase *t);
+
+ QSize size() const { return m_size; }
+
+protected:
+ virtual void generateTexture() = 0;
+ virtual void uploadPendingTexture(int i) = 0;
+
+protected:
+ QSGAreaAllocator m_allocator;
+ unsigned int m_texture_id;
+ QSize m_size;
+ QList<TextureBase *> m_pending_uploads;
+
+private:
+ bool m_allocated;
+};
+
+class Atlas : public AtlasBase
+{
+public:
+ Atlas(const QSize &size);
+ ~Atlas();
+
+ void generateTexture() override;
+ void uploadPendingTexture(int i) override;
+
+ void upload(Texture *texture);
+ void uploadBgra(Texture *texture);
+
+ Texture *create(const QImage &image);
+
+ uint internalFormat() const { return m_internalFormat; }
+ uint externalFormat() const { return m_externalFormat; }
+
+private:
+ uint m_internalFormat;
+ uint m_externalFormat;
+
+ int m_atlas_transient_image_threshold;
+
+ uint m_use_bgra_fallback: 1;
+ uint m_debug_overlay : 1;
+};
+
+class TextureBase : public QSGTexture
+{
+ Q_OBJECT
+public:
+ TextureBase(AtlasBase *atlas, const QRect &textureRect);
+ ~TextureBase();
+
+ int textureId() const override { return m_atlas->textureId(); }
+ bool isAtlasTexture() const override { return true; }
+
+ QRect atlasSubRect() const { return m_allocated_rect; }
+
+ void bind() override;
+
+protected:
+ QRect m_allocated_rect;
+ AtlasBase *m_atlas;
+};
+
+class Texture : public TextureBase
+{
+ Q_OBJECT
+public:
+ Texture(Atlas *atlas, const QRect &textureRect, const QImage &image);
+ ~Texture();
+
+ QSize textureSize() const override { return atlasSubRectWithoutPadding().size(); }
+ void setHasAlphaChannel(bool alpha) { m_has_alpha = alpha; }
+ bool hasAlphaChannel() const override { return m_has_alpha; }
+ bool hasMipmaps() const override { return false; }
+
+ QRectF normalizedTextureSubRect() const override { return m_texture_coords_rect; }
+
+ QRect atlasSubRect() const { return m_allocated_rect; }
+ QRect atlasSubRectWithoutPadding() const { return m_allocated_rect.adjusted(1, 1, -1, -1); }
+
+ QSGTexture *removedFromAtlas() const override;
+
+ void releaseImage() { m_image = QImage(); }
+ const QImage &image() const { return m_image; }
+
+private:
+ QRectF m_texture_coords_rect;
+ QImage m_image;
+ mutable QSGPlainTexture *m_nonatlas_texture;
+ bool m_has_alpha;
+};
+
+}
+
+QT_END_NAMESPACE
+
+#endif