FGFS-4.1/OpenSceneGraph
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Added getColor method to allow easy reading of individual pixels.

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This commit is contained in:
Robert Osfield
2007-10-31 12:55:15 +00:00
parent c761efb371
commit 316b36fab7
2 changed files with 54 additions and 0 deletions
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42
src/osg/Image.cpp
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@@ -15,6 +15,7 @@
#include <osg/Image>
#include <osg/Notify>
#include <osg/io_utils>
#include <osg/Geode>
#include <osg/Geometry>
@@ -1261,3 +1262,44 @@ Geode* osg::createGeodeForImage(osg::Image* image,float s,float t)
}
}
template <typename T>
Vec4 _readColor(GLenum pixelFormat, T* data,float scale)
{
switch(pixelFormat)
{
case(GL_LUMINANCE): { float l = float(*data++)*scale; return Vec4(l, l, l, 1.0f); }
case(GL_ALPHA): { float a = float(*data++)*scale; return Vec4(1.0f, 1.0f, 1.0f, a); }
case(GL_LUMINANCE_ALPHA): { float l = float(*data++)*scale; float a = float(*data++)*scale; return Vec4(l,l,l,a); }
case(GL_RGB): { float r = float(*data++)*scale; float g = float(*data++)*scale; float b = float(*data++)*scale; return Vec4(r,g,b,1.0f); }
case(GL_RGBA): { float r = float(*data++)*scale; float g = float(*data++)*scale; float b = float(*data++)*scale; float a = float(*data++)*scale; return Vec4(r,g,b,a); }
case(GL_BGR): { float b = float(*data++)*scale; float g = float(*data++)*scale; float r = float(*data++)*scale; return Vec4(r,g,b,1.0f); }
case(GL_BGRA): { float b = float(*data++)*scale; float g = float(*data++)*scale; float r = float(*data++)*scale; float a = float(*data++)*scale; return Vec4(r,g,b,a); }
}
return Vec4(1.0f,1.0f,1.0f,1.0f);
}
Vec4 Image::getColor(unsigned int s,unsigned t,unsigned r) const
{
const unsigned char* ptr = data(s,t,r);
switch(_dataType)
{
case(GL_BYTE): return _readColor(_pixelFormat, (char*)ptr, 1.0f/128.0f);
case(GL_UNSIGNED_BYTE): return _readColor(_pixelFormat, (unsigned char*)ptr, 1.0f/255.0f);
case(GL_SHORT): return _readColor(_pixelFormat, (short*)ptr, 1.0f/32768.0f);
case(GL_UNSIGNED_SHORT): return _readColor(_pixelFormat, (unsigned short*)ptr, 1.0f/65535.0f);
case(GL_INT): return _readColor(_pixelFormat, (int*)ptr, 1.0f/2147483648.0f);
case(GL_UNSIGNED_INT): return _readColor(_pixelFormat, (unsigned int*)ptr, 1.0f/4294967295.0f);
case(GL_FLOAT): return _readColor(_pixelFormat, (float*)ptr, 1.0f);
}
return Vec4(1.0f,1.0f,1.0f,1.0f);
}
Vec4 Image::getColor(const Vec3& texcoord) const
{
int s = int(texcoord.x()*float(_s-1)) % _s;
int t = int(texcoord.y()*float(_t-1)) % _t;
int r = int(texcoord.z()*float(_r-1)) % _r;
//osg::notify(osg::NOTICE)<<"getColor("<<texcoord<<")="<<getColor(s,t,r)<<std::endl;
return getColor(s,t,r);
}