203 lines
7.4 KiB
C++
203 lines
7.4 KiB
C++
//C++ header - Open Scene Graph - Copyright (C) 1998-2001 Robert Osfield
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//Distributed under the terms of the GNU Library General Public License (LGPL)
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//as published by the Free Software Foundation.
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// -*-c++-*-
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#ifndef OSG_IMAGE
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#define OSG_IMAGE 1
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#include <osg/Object>
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#include <osg/GL>
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#include <string>
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#include <vector>
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namespace osg {
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/** Image class for encapsulating the storage texture image data.*/
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class SG_EXPORT Image : public Object
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{
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public :
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Image();
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/** Copy constructor using CopyOp to manage deep vs shallow copy.*/
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Image(const Image& image,const CopyOp& copyop=CopyOp::SHALLOW_COPY);
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virtual Object* cloneType() const { return osgNew Image(); }
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virtual Object* clone(const CopyOp& copyop) const { return osgNew Image(*this,copyop); }
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virtual bool isSameKindAs(const Object* obj) const { return dynamic_cast<const Image*>(obj)!=0; }
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virtual const char* libraryName() const { return "osg"; }
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virtual const char* className() const { return "Image"; }
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void setFileName(const std::string& fileName);
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inline const std::string& getFileName() const { return _fileName; }
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/* allocated a pixel block of specified size and type.*/
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void createImage(int s,int t,int r,
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GLenum format,GLenum type,
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int packing=1);
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/** set the image data and format.
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* note, when the packing value is negative (the default is -1) this method assumes
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* a _packing width of 1 if the width is not a multiple of 4,
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* otherwise automatically sets to _packing to 4. If a positive
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* value of packing is supplied than _packing is simply set to that value.
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*/
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void setImage(int s,int t,int r,
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GLint internalTextureformat,
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GLenum format,GLenum type,
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unsigned char *data,
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int packing=1);
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/** readPixels from screen at specified position and size, using glReadPixels.
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* Create memory for storage if required, reuse existing pixel coords if possible.
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* if pixelFormat or dataType*/
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void readPixels(int x,int y,int width,int height,
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GLenum format,GLenum type);
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/** Scale image to specified size. */
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void scaleImage(const int s,const int t,const int r);
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/** Width of image.*/
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inline const int s() const { return _s; }
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/** Height of image.*/
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inline const int t() const { return _t; }
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/** Depth of image.*/
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inline const int r() const { return _r; }
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void setInternalTextureFormat(GLint internalFormat);
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inline const GLint getInternalTextureFormat() const { return _internalTextureFormat; }
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void setPixelFormat(const GLenum format);
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inline const GLenum getPixelFormat() const { return _pixelFormat; }
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inline const GLenum getDataType() const { return _dataType; }
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inline const unsigned int getPacking() const { return _packing; }
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/** return the numbers of bits required for each pixel.*/
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inline const unsigned int getPixelSizeInBits() const { return computePixelSizeInBits(_pixelFormat,_dataType); }
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/** return the numbers of bytes each row of pixels occupies once it has been packed.*/
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inline const unsigned int getRowSizeInBytes() const { return computeRowWidthInBytes(_s,_pixelFormat,_dataType,_packing); }
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/** return the numbers of bytes each image (_s*_t) of pixels occupies..*/
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inline const unsigned int getImageSizeInBytes() const { return getRowSizeInBytes()*_t; }
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/** return the numbers of bytes the whole row/image/volume of pixels occupies.*/
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inline const unsigned int getTotalSizeInBytes() const { return getImageSizeInBytes()*_r; }
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/** raw image data.*/
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inline unsigned char *data() { return _data; }
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/** raw const image data.*/
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inline const unsigned char *data() const { return _data; }
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unsigned char* data(int column, int row=0,int image=0)
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{
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if (!_data) return NULL;
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return _data+(column*getPixelSizeInBits())/8+row*getRowSizeInBytes()+image*getImageSizeInBytes();
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}
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/** Flip the image horizontally.*/
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void flipHorizontal(int image=0);
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/** Flip the image vertically.*/
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void flipVertical(int image=0);
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/** Ensure image dimensions are a power of two.
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* Mip Mapped texture require the image dimensions to be
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* power of two and are within the maxiumum texture size for
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* the host machine.*/
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void ensureValidSizeForTexturing();
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/** Dirty the image, which increments the modified flag, to force osg::Texture to reload the image.*/
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inline void dirty() { ++_modifiedTag; }
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/** Set the modified tag value, only used by osg::Texture when using texture subloading. */
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inline void setModifiedTag(const unsigned int value) { _modifiedTag=value; }
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/** Get modified tag value, only used by osg::Texture when using texture subloading. */
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inline const unsigned int getModifiedTag() const { return _modifiedTag; }
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static const bool isPackedType(GLenum type);
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static const unsigned int computeNumComponents(GLenum format);
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static const unsigned int computePixelSizeInBits(GLenum format,GLenum type);
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static const unsigned int computeRowWidthInBytes(int width,GLenum format,GLenum type,int packing);
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// precomputed mipmaps stuff;
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typedef std::vector< unsigned int > MipmapDataType;
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inline bool isMipmap() const {return !_mipmapData.empty();};
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unsigned int getNumMipmaps() const
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{
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return _mipmapData.size()+1;
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};
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// send offsets into data
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// It is assumed that first mipmap offset (index 0) is 0
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inline void setMipmapData(const MipmapDataType& mipmapDataVector)
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{
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_mipmapData = mipmapDataVector;
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};
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inline unsigned char* getMipmapData(unsigned int mipmapNumber) const
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{
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if(mipmapNumber == 0)
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return _data;
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else if(mipmapNumber < getNumMipmaps())
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return _data + _mipmapData[mipmapNumber-1];
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return 0L;
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};
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protected :
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virtual ~Image();
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Image& operator = (const Image&) { return *this; }
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std::string _fileName;
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int _s, _t, _r;
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GLint _internalTextureFormat;
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GLenum _pixelFormat;
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GLenum _dataType;
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unsigned int _packing;
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unsigned char *_data;
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unsigned int _modifiedTag;
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MipmapDataType _mipmapData;
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};
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class Geode;
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/** Convenience function to be used by images loaders to generate a valid geode
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* to return for readNode().
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* Use the images s and t values scale the dimensions of the image.
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*/
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SG_EXPORT extern Geode* createGeodeForImage(Image* image);
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/** Convenience function to be used by images loaders to generate a valid geode
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* to return for readNode().
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* Use the specified s and t values scale the dimensions of the image.
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*/
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SG_EXPORT extern Geode* createGeodeForImage(Image* image,const float s,const float t);
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}
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#endif // __SG_IMAGE_H
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