+++ /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