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Draw: RescaleBicubic

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git-svn-id: svn://ultimatepp.org/upp/trunk@5973 f0d560ea-af0d-0410-9eb7-867de7ffcac7
This commit is contained in:
cxl 2013-04-09 13:35:43 +00:00
parent 5288da7273
commit c940282a17
5 changed files with 73 additions and 25 deletions
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65
uppsrc/Draw/BiCubic.cpp Normal file
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@ -0,0 +1,65 @@
#include "Draw.h"
NAMESPACE_UPP
double BicubicKernel(double x)
{
double r = 0;
double xp2 = x + 2;
double xp1 = x + 1;
double xm1 = x - 1;
if(xp2 > 0)
r += xp2 * xp2 * xp2;
if(xp1 > 0)
r -= 4 * xp1 * xp1 * xp1;
if(x > 0)
r += 6 * x * x * x;
if(xm1 > 0)
r -= 4 * xm1 * xm1 * xm1;
return 1 / 6.0 * r;
}
Image RescaleBicubic(const Image& img, int cx, int cy)
{
Size isz = img.GetSize();
ImageBuffer ib(cx, cy);
RGBA *t = ~ib;
double inv_cx = 1.0 / cx;
for(int y = 0; y < cy; y++) {
int sy = (y * isz.cy) / cy;
double dy = y * isz.cy / (double)cy - sy;
for(int x = 0; x < cx; x++) {
int sx = (x * isz.cx) / cx;
double dx = x * isz.cx * inv_cx - sx;
double red = 0;
double green = 0;
double blue = 0;
double alpha = 0;
for(int yy = -1; yy <= 2; yy++) {
double ky = BicubicKernel(yy - dy);
const RGBA *l = img[minmax(sy + yy, 0, isz.cy - 1)];
for(int xx = -1; xx <= 2; xx++) {
const RGBA& s = l[minmax(sx + xx, 0, isz.cx - 1)];
double weight = ky * BicubicKernel(xx - dx);
red += weight * s.r;
green += weight * s.g;
blue += weight * s.b;
alpha += weight * s.a;
}
}
t->r = (int)fround(red);
t->g = (int)fround(green);
t->b = (int)fround(blue);
t->a = (int)fround(alpha);
t++;
}
}
return ib;
}
Image RescaleBicubic(const Image& src, Size sz)
{
return RescaleBicubic(src, sz.cx, sz.cy);
}
END_UPP_NAMESPACE

1
uppsrc/Draw/Draw.upp
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@ -50,6 +50,7 @@ file
ImageOp.cpp,
ImageChOp.cpp,
ImageScale.cpp,
BiCubic.cpp,
MakeCache.cpp,
DrawRasterData.cpp,
iml.h,

21
uppsrc/Draw/Image.cpp
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@ -161,27 +161,6 @@ const RGBA* Image::operator~() const
return data ? ~data->buffer : NULL;
}
Image::operator const RGBA*() const
{
return data ? ~data->buffer : NULL;
}
const RGBA* Image::operator[](int i) const
{
ASSERT(data);
return data->buffer[i];
}
Size Image::GetSize() const
{
return data ? data->buffer.GetSize() : Size(0, 0);
}
int Image::GetLength() const
{
return data ? data->buffer.GetLength() : 0;
}
Point Image::GetHotSpot() const
{
return data ? data->buffer.GetHotSpot() : Point(0, 0);

8
uppsrc/Draw/Image.h
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@ -159,13 +159,13 @@ private:
public:
const RGBA* operator~() const;
operator const RGBA*() const;
const RGBA* operator[](int i) const;
operator const RGBA*() const { return data ? ~data->buffer : NULL; }
const RGBA* operator[](int i) const { ASSERT(data); return data->buffer[i]; }
Size GetSize() const;
Size GetSize() const { return data ? data->buffer.GetSize() : Size(0, 0); }
int GetWidth() const { return GetSize().cx; }
int GetHeight() const { return GetSize().cy; }
int GetLength() const;
int GetLength() const { return data ? data->buffer.GetLength() : 0; }
Point GetHotSpot() const;
Point Get2ndSpot() const;
Size GetDots() const;

3
uppsrc/Draw/ImageOp.h
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@ -75,6 +75,9 @@ Image Rescale(const Image& src, Size sz, const Rect& src_rc, Gate2<int, int> pro
Image Rescale(const Image& src, Size sz, Gate2<int, int> progress = false);
Image Rescale(const Image& src, int cx, int cy, Gate2<int, int> progress = false);
Image RescaleBicubic(const Image& img, int cx, int cy);
Image RescaleBicubic(const Image& img, Size sz);
struct ImageFilter9 {
virtual RGBA operator()(const RGBA **mx) = 0;
virtual ~ImageFilter9() {}