--- /dev/null
+/*! ========================================================================
+** Extended Template and Library
+** Surface Class Implementation
+** $Id$
+**
+** Copyright (c) 2002 Robert B. Quattlebaum Jr.
+** Copyright (c) 2008 Chris Moore
+**
+** This package is free software; you can redistribute it and/or
+** modify it under the terms of the GNU General Public License as
+** published by the Free Software Foundation; either version 2 of
+** the License, or (at your option) any later version.
+**
+** This package is distributed in the hope that it will be useful,
+** but WITHOUT ANY WARRANTY; without even the implied warranty of
+** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+** General Public License for more details.
+**
+** === N O T E S ===========================================================
+**
+** This is an internal header file, included by other ETL headers.
+** You should not attempt to use it directly.
+**
+** ========================================================================= */
+
+/* === S T A R T =========================================================== */
+
+#ifndef __ETL__SURFACE_H
+#define __ETL__SURFACE_H
+
+/* === H E A D E R S ======================================================= */
+
+#include "_pen.h"
+#include "_misc.h"
+#include <algorithm>
+#include <cstring>
+
+/* === M A C R O S ========================================================= */
+
+/* === C L A S S E S & S T R U C T S ======================================= */
+
+_ETL_BEGIN_NAMESPACE
+
+template <typename T, typename AT>
+class value_prep
+{
+public:
+ typedef T value_type;
+ typedef AT accumulator_type;
+
+ accumulator_type cook(const value_type& x)const { return (accumulator_type)x; }
+ value_type uncook(const accumulator_type& x)const { return (value_type)x; }
+};
+
+template <typename T, typename AT=T, class VP=value_prep<T,AT> >
+class surface
+{
+public:
+ typedef T value_type;
+ typedef AT accumulator_type;
+ typedef value_type* pointer;
+ typedef const value_type* const_pointer;
+ typedef value_type& reference;
+ typedef generic_pen<value_type,accumulator_type> pen;
+ typedef generic_pen<const value_type,accumulator_type> const_pen;
+ typedef VP value_prep_type;
+
+ typedef alpha_pen<const_pen> const_alpha_pen;
+ typedef alpha_pen<pen> non_const_alpha_pen;
+
+ typedef typename pen::difference_type size_type;
+ typedef typename pen::difference_type difference_type;
+
+ typedef typename pen::iterator_x iterator_x;
+ typedef typename pen::iterator_y iterator_y;
+ typedef typename pen::const_iterator_x const_iterator_x;
+ typedef typename pen::const_iterator_y const_iterator_y;
+
+private:
+ value_type *data_;
+ value_type *zero_pos_;
+ typename difference_type::value_type pitch_;
+ int w_, h_;
+ bool deletable_;
+
+ value_prep_type cooker_;
+
+ void swap(const surface &x)
+ {
+ std::swap(data_,x.data_);
+ std::swap(zero_pos_,x.zero_pos_);
+ std::swap(pitch_,x.pitch_);
+ std::swap(w_,x.w_);
+ std::swap(h_,x.h_);
+ std::swap(deletable_,x.deletable_);
+ }
+
+public:
+ surface():
+ data_(0),
+ zero_pos_(data_),
+ pitch_(0),
+ w_(0),h_(0),
+ deletable_(false) { }
+
+ surface(value_type* data, int w, int h, bool deletable=false):
+ data_(data),
+ zero_pos_(data),
+ pitch_(sizeof(value_type)*w),
+ w_(w),h_(h),
+ deletable_(deletable) { }
+
+ surface(const typename size_type::value_type &w, const typename size_type::value_type &h):
+ data_(new value_type[w*h]),
+ zero_pos_(data_),
+ pitch_(sizeof(value_type)*w),
+ w_(w),h_(h),
+ deletable_(true) { }
+
+ surface(const size_type &s):
+ data_(new value_type[s.x*s.y]),
+ zero_pos_(data_),
+ pitch_(sizeof(value_type)*s.x),
+ w_(s.x),h_(s.y),
+ deletable_(true) { }
+
+ template <typename _pen>
+ surface(const _pen &_begin, const _pen &_end)
+ {
+ typename _pen::difference_type size=_end-_begin;
+
+ data_=new value_type[size.x*size.y];
+ w_=size.x;
+ h_=size.y;
+ zero_pos_=data_;
+ pitch_=sizeof(value_type)*w_;
+ deletable_=true;
+
+ int x,y;
+
+ for(y=0;y<h_;y++)
+ for(x=0;x<w_;x++)
+ (*this)[y][x]=_begin.get_value_at(x,y);
+ }
+
+ surface(const surface &s):
+ data_(s.data_?new value_type[s.w_*s.h_]:0),
+ zero_pos_(data_+(s.zero_pos_-s.data_)),
+ pitch_(s.pitch_),
+ w_(s.w_),
+ h_(s.h_),
+ deletable_(s.data_?true:false)
+ {
+ assert(&s);
+ if(s.data_)
+ {
+ assert(data_);
+ memcpy(data_,s.data_,abs(pitch_)*h_);
+ }
+ }
+
+public:
+ ~surface()
+ {
+ if(deletable_)
+ delete [] data_;
+ }
+
+ size_type
+ size()const
+ { return size_type(w_,h_); }
+
+ typename size_type::value_type get_pitch()const { return pitch_; }
+ typename size_type::value_type get_w()const { return w_; }
+ typename size_type::value_type get_h()const { return h_; }
+
+ const surface &mirror(const surface &rhs)
+ {
+ if(deletable_)delete [] data_;
+
+ data_=rhs.data_;
+ zero_pos_=rhs.zero_pos_;
+ pitch_=rhs.pitch_;
+ w_=rhs.w_;
+ h_=rhs.h_;
+ deletable_=false;
+
+ return *this;
+ }
+
+ const surface &operator=(const surface &rhs)
+ {
+ set_wh(rhs.w_,rhs.h_);
+ zero_pos_=data_+(rhs.zero_pos_-rhs.data_);
+ pitch_=rhs.pitch_;
+ deletable_=true;
+
+ memcpy(data_,rhs.data_,pitch_*h_);
+
+ return *this;
+ }
+
+ void
+ set_wh(typename size_type::value_type w, typename size_type::value_type h)
+ {
+ if(data_)
+ {
+ if(w==w_ && h==h_ && deletable_)
+ return;
+ if(deletable_)
+ delete [] data_;
+ }
+
+ w_=w;
+ h_=h;
+ pitch_=sizeof(value_type)*w_;
+ zero_pos_=data_=new value_type[h_*w_];
+ deletable_=true;
+ }
+
+ void
+ fill(value_type v, int x, int y, int w, int h)
+ {
+ assert(data_);
+ if(w<=0 || h<=0)return;
+ int i;
+ pen PEN(get_pen(x,y));
+ PEN.set_value(v);
+ for(i=0;i<h;i++,PEN.inc_y(),PEN.dec_x(w))
+ PEN.put_hline(w);
+ }
+
+ template <class _pen> void
+ fill(value_type v, _pen& PEN, int w, int h)
+ {
+ assert(data_);
+ if(w<=0 || h<=0)return;
+ int y;
+ PEN.set_value(v);
+ for(y=0;y<h;y++,PEN.inc_y(),PEN.dec_x(w))
+ PEN.put_hline(w);
+ }
+
+ void
+ fill(value_type v)
+ {
+ assert(data_);
+ int y;
+ pen pen_=begin();
+ pen_.set_value(v);
+ for(y=0;y<h_;y++,pen_.inc_y(),pen_.dec_x(w_))
+ pen_.put_hline(w_);
+ }
+
+ template <class _pen> void blit_to(_pen &pen)
+ { return blit_to(pen,0,0, get_w(),get_h()); }
+
+ template <class _pen> void
+ blit_to(_pen &DEST_PEN,
+ int x, int y, int w, int h) //src param
+ {
+ if(x>=w_ || y>=h_)
+ return;
+
+ //clip source origin
+ if(x<0)
+ {
+ w+=x; //decrease
+ x=0;
+ }
+
+ if(y<0)
+ {
+ h+=y; //decrease
+ y=0;
+ }
+
+ //clip width against dest width
+ w = std::min((long)w,(long)(DEST_PEN.end_x()-DEST_PEN.x()));
+ h = std::min((long)h,(long)(DEST_PEN.end_y()-DEST_PEN.y()));
+
+ //clip width against src width
+ w = std::min(w,w_-x);
+ h = std::min(h,h_-y);
+
+ if(w<=0 || h<=0)
+ return;
+
+ pen SOURCE_PEN(get_pen(x,y));
+
+ for(; h>0; h--,DEST_PEN.inc_y(),SOURCE_PEN.inc_y())
+ {
+ int i;
+ for(i=0; i<w; i++,DEST_PEN.inc_x(),SOURCE_PEN.inc_x())
+ {
+ DEST_PEN.put_value(SOURCE_PEN.get_value());
+ }
+ DEST_PEN.dec_x(w);
+ SOURCE_PEN.dec_x(w);
+ }
+ }
+
+ void
+ clear()
+ {
+ assert(data_);
+ if(pitch_==(signed int)sizeof(value_type)*w_)
+ memset(data_,0,h_*pitch_);
+ else
+ fill(value_type());
+ }
+
+ iterator_x
+ operator[](const int &y)
+ { assert(data_); return (pointer)(((char*)zero_pos_)+y*pitch_); }
+
+ const_iterator_x
+ operator[](const int &y)const
+ { assert(data_); return (const_pointer)(((const char*)zero_pos_)+y*pitch_); }
+
+ void
+ flip_v()
+ {
+ assert(data_);
+
+ zero_pos_=(pointer)(((char*)zero_pos_)+pitch_*h_);
+
+ pitch_=-pitch_;
+ }
+
+ bool is_valid()const
+ {
+ return data_!=0
+ && zero_pos_!=0
+ && w_>0
+ && h_>0
+ && pitch_!=0
+ ;
+ }
+
+ operator bool()const { return is_valid(); }
+
+ pen begin() { assert(data_); return pen(data_,w_,h_,pitch_); }
+ pen get_pen(int x, int y) { assert(data_); return begin().move(x,y); }
+ pen end() { assert(data_); return get_pen(w_,h_); }
+
+ const_pen begin()const { assert(data_); return const_pen(data_,w_,h_,pitch_); }
+ const_pen get_pen(int x, int y)const { assert(data_); return begin().move(x,y); }
+ const_pen end()const { assert(data_); return get_pen(w_,h_); }
+
+ //! Linear sample
+ value_type linear_sample(const float x, const float y)const
+ {
+ int u(floor_to_int(x)), v(floor_to_int(y));
+ float a, b;
+ static const float epsilon(1.0e-6);
+
+ if(x<0.0f)u=0,a=0.0f;
+ else if(x>w_-1)u=w_-1,a=0.0f;
+ else a=x-u;
+
+ if(y<0.0f)v=0,b=0.0f;
+ else if(y>h_-1)v=h_-1,b=0.0f;
+ else b=y-v;
+
+ const float
+ c(1.0f-a), d(1.0f-b),
+ e(a*d),f(c*b),g(a*b);
+
+ accumulator_type ret(cooker_.cook((*this)[v][u])*(c*d));
+ if(e>=epsilon)ret+=cooker_.cook((*this)[v][u+1])*e;
+ if(f>=epsilon)ret+=cooker_.cook((*this)[v+1][u])*f;
+ if(g>=epsilon)ret+=cooker_.cook((*this)[v+1][u+1])*g;
+ return cooker_.uncook(ret);
+ }
+
+ //! Cosine sample
+ value_type cosine_sample(const float x, const float y)const
+ {
+ int u(floor_to_int(x)), v(floor_to_int(y));
+ float a, b;
+ static const float epsilon(1.0e-6);
+
+ if(x<0.0f)u=0,a=0.0f;
+ else if(x>w_-1)u=w_-1,a=0.0f;
+ else a=x-u;
+
+ if(y<0.0f)v=0,b=0.0f;
+ else if(y>h_-1)v=h_-1,b=0.0f;
+ else b=y-v;
+
+ a=(1.0f-cos(a*3.1415927f))*0.5f;
+ b=(1.0f-cos(b*3.1415927f))*0.5f;
+
+ const float
+ c(1.0f-a), d(1.0f-b),
+ e(a*d),f(c*b),g(a*b);
+
+ accumulator_type ret(cooker_.cook((*this)[v][u])*(c*d));
+ if(e>=epsilon)ret+=cooker_.cook((*this)[v][u+1])*e;
+ if(f>=epsilon)ret+=cooker_.cook((*this)[v+1][u])*f;
+ if(g>=epsilon)ret+=cooker_.cook((*this)[v+1][u+1])*g;
+
+ return cooker_.uncook(ret);
+ }
+
+ //! Cubic sample
+ value_type cubic_sample(float x, float y)const
+ {
+ #if 0
+ #define P(x) (((x)>=0)?((x)*(x)*(x)):0.0f)
+ #define R(x) ( P(x+2) - 4.0f*P(x+1) + 6.0f*P(x) - 4.0f*P(x-1) )*(1.0f/6.0f)
+ #define F(i,j) (cooker_.cook((*this)[max(min(j+v,h_-1),0)][max(min(i+u,w_-1),0)])*(R((i)-a)*R(b-(j))))
+ #define Z(i,j) ret+=F(i,j)
+ #define X(i,j) // placeholder... To make box more symmetric
+
+ int u(floor_to_int(x)), v(floor_to_int(y));
+ float a, b;
+
+ // Clamp X
+ if(x<0.0f)u=0,a=0.0f;
+ else if(u>w_-1)u=w_-1,a=0.0f;
+ else a=x-u;
+
+ // Clamp Y
+ if(y<0.0f)v=0,b=0.0f;
+ else if(v>h_-1)v=h_-1,b=0.0f;
+ else b=y-v;
+
+ // Interpolate
+ accumulator_type ret(F(0,0));
+ Z(-1,-1); Z(-1, 0); Z(-1, 1); Z(-1, 2);
+ Z( 0,-1); X( 0, 0); Z( 0, 1); Z( 0, 2);
+ Z( 1,-1); Z( 1, 0); Z( 1, 1); Z( 1, 2);
+ Z( 2,-1); Z( 2, 0); Z( 2, 1); Z( 2, 2);
+
+ return cooker_.uncook(ret);
+
+ #undef X
+ #undef Z
+ #undef F
+ #undef P
+ #undef R
+ #else
+
+ #define f(j,i) (cooker_.cook((*this)[j][i]))
+ //Using catmull rom interpolation because it doesn't blur at all
+ //bezier curve with intermediate ctrl pts: 0.5/3(p(i+1) - p(i-1)) and similar
+ accumulator_type xfa [4];
+
+ //precalculate indices (all clamped) and offset
+ const int xi = x > 0 ? (x < w_ ? (int)floor(x) : w_-1) : 0;
+ const int xa[] = {std::max(0,xi-1),xi,std::min(w_-1,xi+1),std::min(w_-1,xi+2)};
+
+ const int yi = y > 0 ? (y < h_ ? (int)floor(y) : h_-1) : 0;
+ const int ya[] = {std::max(0,yi-1),yi,std::min(h_-1,yi+1),std::min(h_-1,yi+2)};
+
+ const float xf = x-xi;
+ const float yf = y-yi;
+
+ //figure polynomials for each point
+ const float txf[] =
+ {
+ 0.5*xf*(xf*(xf*(-1) + 2) - 1), //-t + 2t^2 -t^3
+ 0.5*(xf*(xf*(3*xf - 5)) + 2), //2 - 5t^2 + 3t^3
+ 0.5*xf*(xf*(-3*xf + 4) + 1), //t + 4t^2 - 3t^3
+ 0.5*xf*xf*(xf-1) //-t^2 + t^3
+ };
+
+ const float tyf[] =
+ {
+ 0.5*yf*(yf*(yf*(-1) + 2) - 1), //-t + 2t^2 -t^3
+ 0.5*(yf*(yf*(3*yf - 5)) + 2), //2 - 5t^2 + 3t^3
+ 0.5*yf*(yf*(-3*yf + 4) + 1), //t + 4t^2 - 3t^3
+ 0.5*yf*yf*(yf-1) //-t^2 + t^3
+ };
+
+ //evaluate polynomial for each row
+ for(int i = 0; i < 4; ++i)
+ {
+ xfa[i] = f(ya[i],xa[0])*txf[0] + f(ya[i],xa[1])*txf[1] + f(ya[i],xa[2])*txf[2] + f(ya[i],xa[3])*txf[3];
+ }
+
+ //return the cumulative column evaluation
+ return cooker_.uncook(xfa[0]*tyf[0] + xfa[1]*tyf[1] + xfa[2]*tyf[2] + xfa[3]*tyf[3]);
+#undef f
+#endif
+ }
+
+ value_type sample_rect(float x0,float y0,float x1,float y1) const
+ {
+ const surface &s = *this;
+
+ //assumes it's clamped to the boundary of the image
+ //force min max relationship for x0,x1 and y0,y1
+ if(x0 > x1) std::swap(x0,x1);
+ if(y0 > y1) std::swap(y0,y1);
+
+ //local variable madness
+ //all things that want to inter-operate should provide a default value constructor for = 0
+ accumulator_type acum = 0;
+ int xi=0,yi=0;
+
+ int xib=(int)floor(x0),
+ xie=(int)floor(x1);
+
+ int yib=(int)floor(y0),
+ yie=(int)floor(y1);
+
+ //the weight for the pixel should remain the same...
+ float weight = (y1-y0)*(x1-x0);
+ assert(weight != 0);
+
+ float ylast = y0, xlastb = x0;
+ const_pen pen_ = s.get_pen(xib,yib);
+
+ for(yi = yib; yi < yie; ylast = ++yi, pen_.inc_y())
+ {
+ const float yweight = yi+1 - ylast;
+
+ float xlast = xlastb;
+ for(xi = xib; xi < xie; xlast = ++xi, pen_.inc_x())
+ {
+ const float w = yweight*(xi+1 - xlast);
+ acum += cooker_.cook(pen_.get_value())*w;
+ }
+
+ //post... with next being fractional...
+ const float w = yweight*(x1 - xlast);
+ acum += cooker_.cook(pen_.get_value())*w;
+
+ pen_.dec_x(xie-xib);
+ }
+
+ //post in y direction... must have all x...
+ {
+ const float yweight = y1 - ylast;
+
+ float xlast = xlastb;
+ for(xi = xib; xi < xie; xlast = ++xi)
+ {
+ const float w = yweight*(xi+1 - xlast);
+
+ acum += cooker_.cook(pen_.get_value())*w;
+ }
+
+ //post... with next being fractional...
+ const float w = yweight*(x1 - xlast);
+ acum += cooker_.cook(pen_.get_value())*w;
+ }
+
+ acum *= 1/weight;
+ return cooker_.uncook(acum);
+ }
+
+ value_type sample_rect_clip(float x0,float y0,float x1,float y1) const
+ {
+ const surface &s = *this;
+
+ //assumes it's clamped to the boundary of the image
+ //force min max relationship for x0,x1 and y0,y1
+ if(x0 > x1) std::swap(x0,x1);
+ if(y0 > y1) std::swap(y0,y1);
+
+ //local variable madness
+ //all things that want to inter-operate should provide a default value constructor for = 0
+ accumulator_type acum = 0;
+ int xi=0,yi=0;
+
+ int xib=(int)floor(x0),
+ xie=(int)floor(x1);
+
+ int yib=(int)floor(y0),
+ yie=(int)floor(y1);
+
+ //the weight for the pixel should remain the same...
+ float weight = (y1-y0)*(x1-x0);
+
+ assert(weight != 0);
+
+ //clip to the input region
+ if(x0 >= s.get_w() || x1 <= 0) return acum;
+ if(y0 >= s.get_h() || y1 <= 0) return acum;
+
+ if(x0 < 0) { x0 = 0; xib = 0; }
+ if(x1 >= s.get_w())
+ {
+ x1 = s.get_w(); //want to be just below the last pixel...
+ xie = s.get_w()-1;
+ }
+
+ if(y0 < 0) { y0 = 0; yib = 0; }
+ if(y1 >= s.get_h())
+ {
+ y1 = s.get_h(); //want to be just below the last pixel...
+ yie = s.get_h()-1;
+ }
+
+ float ylast = y0, xlastb = x0;
+ const_pen pen = s.get_pen(xib,yib);
+
+ for(yi = yib; yi < yie; ylast = ++yi, pen.inc_y())
+ {
+ const float yweight = yi+1 - ylast;
+
+ float xlast = xlastb;
+ for(xi = xib; xi < xie; xlast = ++xi, pen.inc_x())
+ {
+ const float w = yweight*(xi+1 - xlast);
+ acum += cooker_.cook(pen.get_value())*w;
+ }
+
+ //post... with next being fractional...
+ const float w = yweight*(x1 - xlast);
+ acum += cooker_.cook(pen.get_value())*w;
+
+ pen.dec_x(xie-xib);
+ }
+
+ //post in y direction... must have all x...
+ {
+ const float yweight = y1 - ylast;
+
+ float xlast = xlastb;
+ for(xi = xib; xi < xie; xlast = ++xi)
+ {
+ const float w = yweight*(xi+1 - xlast);
+
+ acum += cooker_.cook(pen.get_value())*w;
+ }
+
+ //post... with next being fractional...
+ const float w = yweight*(x1 - xlast);
+ acum += cooker_.cook(pen.get_value())*w;
+ }
+
+ acum *= 1/weight;
+ return cooker_.uncook(acum);
+ }
+};
+
+_ETL_END_NAMESPACE
+
+/* === T Y P E D E F S ===================================================== */
+
+
+/* === E N D =============================================================== */
+
+#endif
projects / synfig.git / blobdiff