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- /************************************************************************
- filename: CEGUIRenderCache.h
- created: Fri Jun 17 2005
- author: Paul D Turner <paul@cegui.org.uk>
- *************************************************************************/
- /*************************************************************************
- Crazy Eddie's GUI System (http://www.cegui.org.uk)
- Copyright (C)2004 - 2005 Paul D Turner (paul@cegui.org.uk)
-
- This library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
-
- This library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public
- License along with this library; if not, write to the Free Software
- Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *************************************************************************/
- #ifndef _CEGUIRenderCache_h_
- #define _CEGUIRenderCache_h_
-
- #include "CEGUIVector.h"
- #include "CEGUIRect.h"
- #include "CEGUIImage.h"
- #include "CEGUIFont.h"
- #include <vector>
-
-
- #if defined(_MSC_VER)
- # pragma warning(push)
- # pragma warning(disable : 4251)
- #endif
-
-
- // Start of CEGUI namespace section
- namespace CEGUI
- {
- /*!
- \brief
- Class that acts as a cache for images that need to be rendered.
-
- This is in many ways an optimisation cache, it allows a full image redraw
- to occur while limiting the amount of information that needs to be re-calculated.
- \par
- Basically, unless the actual images (or their size) change, or the colours (or alpha) change
- then imagery cached in here will suffice for a full redraw. The reasoning behind this is that
- when some window underneath window 'X' changes, a full image redraw is required by the
- renderer, however, since window 'X' is unchanged, performing a total recalculation of all
- imagery is very wasteful, and so we use this cache to limit such waste.
- \par
- As another example, when a window is simply moved, there is no need to perform a total imagery
- recalculation; we can still use the imagery cached here since it is position independant.
- */
- class CEGUIEXPORT RenderCache
- {
- public:
- /*!
- \brief
- Constructor
- */
- RenderCache();
-
- /*!
- \brief
- Destructor
- */
- ~RenderCache();
-
- /*!
- \brief
- Return whether the cache contains anything to draw.
-
- \return
- - true if the cache contains information about images to be drawn.
- - false if the cache is empty.
- */
- bool hasCachedImagery() const;
-
- /*!
- \brief
- Send the contents of the cache to the Renderer.
-
- \param basePos
- Point that describes a screen offset that cached imagery will be rendered relative to.
-
- \param baseZ
- Z value that cached imagery will use as a base figure when calculating final z values.
-
- \param clipper
- Rect object describing a rect to which imagery will be clipped.
-
- \return
- Nothing
- */
- void render(const Point& basePos, float baseZ, const Rect& clipper) const;
-
- /*!
- \brief
- Erase any stored image information.
- */
- void clearCachedImagery();
-
- /*!
- \brief
- Add an image to the cache.
-
- \param image
- Image object to be cached.
-
- \param destArea
- Destination area over which the Image object will be rendered. This area should be position
- independant; so position (0,0) will be to top-left corner of whatever it is you're rendering
- (like a Window for example).
-
- \param zOffset
- Zero based z offset for this image. Allows imagery to be layered.
-
- \param cols
- ColourRect object describing the colours to be applied when rendering this image.
-
- \return
- Nothing
- */
- void cacheImage(const Image& image, const Rect& destArea, float zOffset, const ColourRect& cols, const Rect* clipper = 0, bool clipToDisplay = false);
-
- /*!
- \brief
- Add a text to the cache.
-
- \param text
- String object to be cached.
-
- \param font
- Font to be used when rendering.
-
- \param format
- TextFormatting value specifying the formatting to use when rendering.
-
- \param destArea
- Destination area over which the Image object will be rendered. This area should be position
- independant; so position (0,0) will be to top-left corner of whatever it is you're rendering
- (like a Window for example).
-
- \param zOffset
- Zero based z offset for this image. Allows imagery to be layered.
-
- \param cols
- ColourRect object describing the colours to be applied when rendering this image.
-
- \return
- Nothing
- */
- void cacheText(const String& text, const Font* font, TextFormatting format, const Rect& destArea, float zOffset, const ColourRect& cols, const Rect* clipper = 0, bool clipToDisplay = false);
-
- private:
- /*!
- \brief
- internal struct that holds info about a single image to be drawn.
- */
- struct ImageInfo
- {
- const Image* source_image;
- Rect target_area;
- float z_offset;
- ColourRect colours;
- Rect customClipper;
- bool usingCustomClipper;
- bool clipToDisplay;
- };
-
- /*!
- \brief
- internal struct that holds info about text to be drawn.
- */
- struct TextInfo
- {
- String text;
- const Font* source_font;
- TextFormatting formatting;
- Rect target_area;
- float z_offset;
- ColourRect colours;
- Rect customClipper;
- bool usingCustomClipper;
- bool clipToDisplay;
- };
-
- typedef std::vector<ImageInfo> ImageryList;
- typedef std::vector<TextInfo> TextList;
-
- ImageryList d_cachedImages; //!< Collection of ImageInfo structs.
- TextList d_cachedTexts; //!< Collection of TextInfo structs.
- };
-
- } // End of CEGUI namespace section
-
-
- #if defined(_MSC_VER)
- # pragma warning(pop)
- #endif
-
-
- #endif // end of guard _CEGUIRenderCache_h_
-