[transformN image modifier

This commit is contained in:
Kahrl 2012-03-29 22:58:01 +03:00 committed by Perttu Ahola
parent 42bbd5c9ae
commit 0983f65da7

@ -492,6 +492,12 @@ void overlay(video::IImage *image, video::IImage *overlay);
// Brighten image
void brighten(video::IImage *image);
// Parse a transform name
u32 parseImageTransform(const std::string& s);
// Apply transform to image dimension
core::dimension2d<u32> imageTransformDimension(u32 transform, core::dimension2d<u32> dim);
// Apply transform to image data
void imageTransform(u32 transform, video::IImage *src, video::IImage *dst);
/*
Generate image based on a string like "stone.png" or "[crack0".
@ -1405,6 +1411,46 @@ bool generate_image(std::string part_of_name, video::IImage *& baseimg,
baseimg->setPixel(x,y,c);
}
}
/*
"[transformN"
Rotates and/or flips the image.
N can be a number (between 0 and 7) or a transform name.
Rotations are counter-clockwise.
0 I identity
1 R90 rotate by 90 degrees
2 R180 rotate by 180 degrees
3 R270 rotate by 270 degrees
4 FX flip X
5 FXR90 flip X then rotate by 90 degrees
6 FY flip Y
7 FYR90 flip Y then rotate by 90 degrees
Note: Transform names can be concatenated to produce
their product (applies the first then the second).
The resulting transform will be equivalent to one of the
eight existing ones, though (see: dihedral group).
*/
else if(part_of_name.substr(0,10) == "[transform")
{
if(baseimg == NULL)
{
errorstream<<"generate_image(): baseimg==NULL "
<<"for part_of_name=\""<<part_of_name
<<"\", cancelling."<<std::endl;
return false;
}
u32 transform = parseImageTransform(part_of_name.substr(10));
core::dimension2d<u32> dim = imageTransformDimension(
transform, baseimg->getDimension());
video::IImage *image = driver->createImage(
baseimg->getColorFormat(), dim);
assert(image);
imageTransform(transform, baseimg, image);
baseimg->drop();
baseimg = image;
}
/*
[inventorycube{topimage{leftimage{rightimage
In every subimage, replace ^ with &.
@ -1577,3 +1623,106 @@ void brighten(video::IImage *image)
}
}
u32 parseImageTransform(const std::string& s)
{
int total_transform = 0;
std::string transform_names[8];
transform_names[0] = "i";
transform_names[1] = "r90";
transform_names[2] = "r180";
transform_names[3] = "r270";
transform_names[4] = "fx";
transform_names[6] = "fy";
std::size_t pos = 0;
while(pos < s.size())
{
int transform = -1;
for(int i = 0; i <= 7; ++i)
{
const std::string &name_i = transform_names[i];
if(s[pos] == ('0' + i))
{
transform = i;
pos++;
break;
}
else if(!(name_i.empty()) &&
lowercase(s.substr(pos, name_i.size())) == name_i)
{
transform = i;
pos += name_i.size();
break;
}
}
if(transform < 0)
break;
// Multiply total_transform and transform in the group D4
int new_total = 0;
if(transform < 4)
new_total = (transform + total_transform) % 4;
else
new_total = (transform - total_transform + 8) % 4;
if((transform >= 4) ^ (total_transform >= 4))
new_total += 4;
total_transform = new_total;
}
return total_transform;
}
core::dimension2d<u32> imageTransformDimension(u32 transform, core::dimension2d<u32> dim)
{
if(transform % 2 == 0)
return dim;
else
return core::dimension2d<u32>(dim.Height, dim.Width);
}
void imageTransform(u32 transform, video::IImage *src, video::IImage *dst)
{
if(src == NULL || dst == NULL)
return;
core::dimension2d<u32> srcdim = src->getDimension();
core::dimension2d<u32> dstdim = dst->getDimension();
assert(dstdim == imageTransformDimension(transform, srcdim));
assert(transform >= 0 && transform <= 7);
/*
Compute the transformation from source coordinates (sx,sy)
to destination coordinates (dx,dy).
*/
int sxn = 0;
int syn = 2;
if(transform == 0) // identity
sxn = 0, syn = 2; // sx = dx, sy = dy
else if(transform == 1) // rotate by 90 degrees ccw
sxn = 3, syn = 0; // sx = (H-1) - dy, sy = dx
else if(transform == 2) // rotate by 180 degrees
sxn = 1, syn = 3; // sx = (W-1) - dx, sy = (H-1) - dy
else if(transform == 3) // rotate by 270 degrees ccw
sxn = 2, syn = 1; // sx = dy, sy = (W-1) - dx
else if(transform == 4) // flip x
sxn = 1, syn = 2; // sx = (W-1) - dx, sy = dy
else if(transform == 5) // flip x then rotate by 90 degrees ccw
sxn = 2, syn = 0; // sx = dy, sy = dx
else if(transform == 6) // flip y
sxn = 0, syn = 3; // sx = dx, sy = (H-1) - dy
else if(transform == 7) // flip y then rotate by 90 degrees ccw
sxn = 3, syn = 1; // sx = (H-1) - dy, sy = (W-1) - dx
for(u32 dy=0; dy<dstdim.Height; dy++)
for(u32 dx=0; dx<dstdim.Width; dx++)
{
u32 entries[4] = {dx, dstdim.Width-1-dx, dy, dstdim.Height-1-dy};
u32 sx = entries[sxn];
u32 sy = entries[syn];
video::SColor c = src->getPixel(sx,sy);
dst->setPixel(dx,dy,c);
}
}