1 files changed, 57 insertions, 0 deletions
diff --git a/vcl/inc/opengl/PackedTextureAtlas.hxx b/vcl/inc/opengl/PackedTextureAtlas.hxx
new file mode 100644
index 000000000..7a283aa45
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+++ b/vcl/inc/opengl/PackedTextureAtlas.hxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ */
+
+#ifndef INCLUDED_VCL_INC_OPENGL_PACKEDTEXTUREATLAS_HXX
+#define INCLUDED_VCL_INC_OPENGL_PACKEDTEXTUREATLAS_HXX
+
+#include <memory>
+#include <opengl/texture.hxx>
+
+struct PackedTexture;
+
+/**
+ * Pack textures into one texture atlas.
+ *
+ * This is based on algorithm described in [1] and is an
+ * adaptation of "texture atlas generator" from [2].
+ *
+ * [1]: http://www.blackpawn.com/texts/lightmaps/
+ * [2]: https://github.com/lukaszdk/texture-atlas-generator
+ *
+ */
+class VCL_DLLPUBLIC PackedTextureAtlasManager final
+{
+    std::vector<std::unique_ptr<PackedTexture>> maPackedTextures;
+
+    int mnTextureWidth;
+    int mnTextureHeight;
+
+    void CreateNewTexture();
+
+    PackedTextureAtlasManager( const PackedTextureAtlasManager& ) = delete;
+    PackedTextureAtlasManager& operator=( const PackedTextureAtlasManager& ) = delete;
+
+public:
+
+    /**
+     * nTextureWidth and nTextureHeight are the dimensions of the common texture(s)
+     * nTextureLimit is the maximum limit of that a texture atlas can have (0 or less - unlimited)
+     */
+    PackedTextureAtlasManager(int nTextureWidth, int nTextureHeight);
+    ~PackedTextureAtlasManager();
+
+    OpenGLTexture InsertBuffer(int nWidth, int nHeight, int nFormat, int nType, sal_uInt8 const * pData);
+    OpenGLTexture Reserve(int nWidth, int nHeight);
+    std::vector<GLuint> ReduceTextureNumber(int nMaxNumberOfTextures);
+};
+
+#endif // INCLUDED_VCL_INC_OPENGL_PACKEDTEXTUREATLAS_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */