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From Marcin Prus and Robert Osfield, moved the key parts of the .dds plugins computeRowWidthInBytes implementation into the osg::Image::computeImageSizeInBytes(..) to

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address bugs in the computation of image size.
This commit is contained in:
Robert Osfield
2013-05-28 14:14:45 +00:00
parent d024444140
commit 47f574429a
4 changed files with 48 additions and 50 deletions
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47
src/osg/Image.cpp
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@@ -722,14 +722,49 @@ unsigned int Image::computeRowWidthInBytes(int width,GLenum pixelFormat,GLenum t
return (widthInBits/packingInBits + ((widthInBits%packingInBits)?1:0))*packing;
}
unsigned int Image::computeImageSizeInBytes(int width,int height, int depth, GLenum pixelFormat,GLenum type,int packing)
unsigned int Image::computeImageSizeInBytes(int width,int height, int depth, GLenum pixelFormat,GLenum type,int packing, int slice_packing, int image_packing)
{
if (width==0 || height==0 || depth==0) return 0;
if (width<=0 || height<=0 || depth<=0) return 0;
return osg::maximum(
Image::computeRowWidthInBytes(width,pixelFormat,type,packing)*height*depth,
computeBlockSize(pixelFormat, packing)
);
// Taking advantage of the fact that
// DXT formats are defined as 4 successive numbers:
// GL_COMPRESSED_RGB_S3TC_DXT1_EXT 0x83F0
// GL_COMPRESSED_RGBA_S3TC_DXT1_EXT 0x83F1
// GL_COMPRESSED_RGBA_S3TC_DXT3_EXT 0x83F2
// GL_COMPRESSED_RGBA_S3TC_DXT5_EXT 0x83F3
if( pixelFormat >= GL_COMPRESSED_RGB_S3TC_DXT1_EXT &&
pixelFormat <= GL_COMPRESSED_RGBA_S3TC_DXT5_EXT )
{
width = (width + 3) & ~3;
height = (height + 3) & ~3;
}
// 3dc ATI formats
// GL_COMPRESSED_RED_RGTC1_EXT 0x8DBB
// GL_COMPRESSED_SIGNED_RED_RGTC1_EXT 0x8DBC
// GL_COMPRESSED_RED_GREEN_RGTC2_EXT 0x8DBD
// GL_COMPRESSED_SIGNED_RED_GREEN_RGTC2_EXT 0x8DBE
if( pixelFormat >= GL_COMPRESSED_RED_RGTC1_EXT &&
pixelFormat <= GL_COMPRESSED_SIGNED_RED_GREEN_RGTC2_EXT )
{
width = (width + 3) & ~3;
height = (height + 3) & ~3;
}
// compute size of one row
unsigned int size = osg::Image::computeRowWidthInBytes( width, pixelFormat, type, packing );
// now compute size of slice
size *= height;
size += slice_packing - 1;
size -= size % slice_packing;
// compute size of whole image
size *= depth;
size += image_packing - 1;
size -= size % image_packing;
return osg::maximum( size, computeBlockSize(pixelFormat, packing) );
}
int Image::computeNearestPowerOfTwo(int s,float bias)