--- /dev/null
+/*! ========================================================================
+** Extended Template Library
+** Pen Template Class Implementation
+** $Id$
+**
+** Copyright (c) 2002 Robert B. Quattlebaum Jr.
+**
+** 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__PEN_H
+#define __ETL__PEN_H
+
+/* === H E A D E R S ======================================================= */
+
+#include "_curve_func.h"
+#include <cassert>
+#include <iterator>
+#include <algorithm>
+
+/* === M A C R O S ========================================================= */
+
+/* === T Y P E D E F S ===================================================== */
+
+/* === C L A S S E S & S T R U C T S ======================================= */
+
+_ETL_BEGIN_NAMESPACE
+
+template<typename T>
+class generic_pen_row_iterator
+{
+public:
+ struct iterator_category : public std::random_access_iterator_tag {};
+ typedef T value_type;
+ typedef int difference_type;
+ typedef value_type* pointer;
+ typedef value_type& reference;
+
+ typedef generic_pen_row_iterator<value_type> self_type;
+
+ pointer data_;
+ int pitch_;
+
+ reference operator[](int i)const { assert(data_); return *(pointer)( (char*)data_+pitch_*i ); }
+ reference operator*()const { assert(data_); return *data_; }
+ pointer operator->() const { assert(data_); return &(operator*()); }
+
+ void inc() { assert(data_); data_ = (pointer)((char*)data_ + pitch_); }
+ void inc(int n) { assert(data_); data_ = (pointer)((char*)data_ + n*pitch_); }
+
+ void dec() { assert(data_); data_ = (pointer)((char*)data_ - pitch_); }
+ void dec(int n) { assert(data_); data_ = (pointer)((char*)data_ - n*pitch_); }
+
+ const self_type &operator++() { assert(data_); inc(); return *this; }
+ const self_type &operator--() { assert(data_); dec(); return *this; }
+
+ self_type operator++(int)
+ { assert(data_); self_type ret(*this); inc(); return ret; }
+ self_type operator--(int)
+ { assert(data_); self_type ret(*this); dec(); return ret; }
+
+ bool operator==(const self_type &rhs)const
+ { return data_==rhs.data_; }
+
+ bool operator!=(const self_type &rhs)const
+ { return data_!=rhs.data_; }
+
+ difference_type operator-(const self_type &rhs)const
+ { assert(data_); return ((char*)data_-(char*)rhs.data_-1)/pitch_+1; }
+
+ self_type operator+(const difference_type &rhs)const
+ {
+ assert(data_);
+ self_type ret(*this);
+ ret.inc(rhs);
+ return ret;
+ }
+
+ self_type operator-(const difference_type &rhs)const
+ {
+ assert(data_);
+ self_type ret(*this);
+ ret.dec(rhs);
+ return ret;
+ }
+
+ operator const generic_pen_row_iterator<const value_type>()const
+ {
+ return generic_pen_row_iterator<const value_type>(data_,pitch_);
+ }
+
+ operator bool()const { return (bool)data_; }
+ bool operator!()const { return !data_; }
+
+ generic_pen_row_iterator(pointer data, int pitch):data_(data),pitch_(pitch) { }
+ generic_pen_row_iterator():data_(NULL) { }
+};
+
+template<typename T, typename AT=T>
+class generic_pen
+{
+public:
+ typedef T value_type;
+ typedef AT accumulator_type;
+ typedef value_type* pointer;
+ typedef const value_type* const_pointer;
+ typedef value_type& reference;
+ typedef const value_type& const_reference;
+
+ typedef pointer iterator_x;
+ typedef const_pointer const_iterator_x;
+
+ typedef generic_pen_row_iterator<value_type> iterator_y;
+ typedef generic_pen_row_iterator<const value_type> const_iterator_y;
+
+ struct difference_type
+ {
+ typedef int value_type;
+ value_type x,y;
+ difference_type(value_type x, value_type y):x(x),y(y) { }
+ value_type &operator[](int i)const { return i?y:x; }
+ };
+
+protected:
+ int x_,y_;
+ int w_,h_;
+private:
+ int pitch_;
+ value_type value_;
+ value_type *data_;
+
+ typedef generic_pen<T,AT> self_type;
+
+ void addptr(int nbytes)
+ {
+ data_ = (pointer)((char*)data_ + nbytes);
+ }
+
+ void subptr(int nbytes)
+ {
+ data_ = (pointer)((char*)data_ - nbytes);
+ }
+
+public:
+
+ generic_pen(value_type *data, int w, int h, int pitch):
+ x_(0),
+ y_(0),
+ w_(w),
+ h_(h),
+ pitch_(pitch),
+ data_(data)
+ {
+ }
+
+ generic_pen(value_type *data, int w, int h):
+ x_(0),
+ y_(0),
+ w_(w),
+ h_(h),
+ pitch_(sizeof(value_type)*w),
+ data_(data)
+ {
+ }
+
+ generic_pen():data_(NULL) { }
+
+ self_type& move(int a, int b)
+ {
+ assert(data_);
+ x_ += a, y_ += b;
+ addptr(b*pitch_ + a*sizeof(value_type));
+ return *this;
+ }
+ self_type& move_to(int x, int y) { assert(data_); return move(x - x_,y - y_);}
+ void set_value(const value_type &v) { value_=v; }
+
+ void inc_x() { assert(data_); x_++; data_++; }
+ void dec_x() { assert(data_); x_--; data_--; }
+ void inc_y() { assert(data_); y_++; addptr(pitch_); }
+ void dec_y() { assert(data_); y_--; subptr(pitch_); }
+
+ void inc_x(int n) { assert(data_); x_+=n; data_+=n; }
+ void dec_x(int n) { assert(data_); x_-=n; data_-=n; }
+ void inc_y(int n) { assert(data_); y_+=n; data_ = (pointer)((char*)data_ + pitch_*n); }
+ void dec_y(int n) { assert(data_); y_-=n; data_ = (pointer)((char*)data_ - pitch_*n); }
+
+ void put_value(const value_type &v)const { assert(data_); *data_=v; }
+ void put_value()const { assert(data_); put_value(value_); }
+
+ void put_value_clip(const value_type &v)const
+ { if(!clipped()) put_value(v); }
+ void put_value_clip()const { put_value_clip(value_); }
+
+ const_reference get_value()const { assert(data_); return *data_; }
+
+ const_reference get_value_at(int x, int y)const { assert(data_); return ((pointer)(((char*)data_)+y*pitch_))[x]; }
+
+ const_reference get_value_clip_at(int x, int y)const { assert(data_); if(clipped(x,y))return value_type(); return ((pointer)(((char*)data_)+y*pitch_))[x]; }
+
+ const value_type get_value_clip()const { assert(data_); if(clipped())return value_type(); return *data_; }
+
+ const value_type get_pen_value()const { return value_; }
+
+ void put_hline(int l,const value_type &v)
+ {for(;l>0;l--,inc_x())put_value(v);}
+
+ void put_hline(int l) {put_hline(l,value_);}
+
+ void put_hline_clip(int l, const value_type &v)
+ {l=std::min(l,w_-x_);for(;l>0;l--,inc_x())put_value_clip(v);}
+
+ void put_hline_clip(int l) {put_hline_clip(l,value_);}
+
+ //the put_block functions do not modify the pen
+ void put_block(int h, int w, const value_type &v)
+ {
+ self_type row(*this);
+ for(;h>0;h--,row.inc_y())
+ {
+ self_type col(row);
+ col.put_hline(w,v);
+ }
+ }
+
+ void put_block(int h, int w) { put_block(h,w,value_); }
+
+ void put_block_clip(int h, int w, const value_type &v)
+ {
+ self_type row(*this);
+
+ //clip start position
+ if(row.x_ < 0) { w+=row.x_; row.inc_x(-row.x_); }
+ if(row.y_ < 0) { h+=row.y_; row.inc_y(-row.y_); }
+
+ //clip width and height of copy rect
+ h = std::min(h,h_-y_);
+ w = std::min(w,w_-x_);
+
+ //copy rect
+ for(;h>0;h--,row.inc_y())
+ {
+ self_type col(row);
+ col.put_hline(w,v); //already clipped
+ }
+ }
+
+ void put_block_clip(int h, int w) { put_block(h,w,value_); }
+
+
+ iterator_x operator[](int i)const { assert(data_); return (pointer)(((char*)data_)+i*pitch_); }
+
+ iterator_x x() { assert(data_); return data_; }
+ iterator_x begin_x() { assert(data_); return data_-x_; }
+ iterator_x end_x() { assert(data_); return data_-x_+w_; }
+
+ iterator_y y() { assert(data_); return iterator_y(data_,pitch_); }
+ iterator_y begin_y() { assert(data_); return iterator_y((pointer)((char*)data_ - y_*pitch_),pitch_); }
+ iterator_y end_y() { assert(data_); return iterator_y((pointer)((char*)data_ + (h_-y_)*pitch_),pitch_); }
+
+ operator bool()const { return (bool)data_; }
+ bool operator!()const { return !data_; }
+ bool operator==(const self_type &rhs)const { return data_==rhs.data_; }
+ bool operator!=(const self_type &rhs)const { return data_!=rhs.data_; }
+ bool clipped(int x, int y)const { return !(x_+x>=0 && y_+y>=0 && x_+x<w_ && y_+y<h_); }
+ bool clipped()const { return !(x_>=0 && y_>=0 && x_<w_ && y_<h_); }
+
+ difference_type operator-(const self_type &rhs)const
+ {
+ assert(data_);
+ assert(pitch_==rhs.pitch_);
+ int ptr_diff=(char*)data_-(char*)rhs.data_-1;
+ return difference_type(ptr_diff%pitch_/sizeof(value_type)+1,ptr_diff/pitch_);
+ }
+
+ self_type operator+(const difference_type &rhs)const
+ {
+ assert(data_);
+ self_type ret(*this);
+ ret.move(rhs.x,rhs.y);
+ return ret;
+ }
+
+ difference_type diff_begin()const {return difference_type(-x_,-y_);}
+ difference_type diff_end()const {return difference_type(w_-x_,h_-y_);}
+
+ self_type get_start()const {return *this + diff_begin(); }
+ self_type get_end()const {return *this + diff_end(); }
+
+ int get_width()const {return w_;}
+ int get_height()const {return h_;}
+
+ int get_w()const {return w_;}
+ int get_h()const {return h_;}
+ int get_pitch()const {return pitch_;}
+};
+
+template <
+ typename PEN_,
+ typename A_=float,
+ class AFFINE_=affine_combo<typename PEN_::value_type,A_>
+>
+class alpha_pen : public PEN_
+{
+public:
+ typedef A_ alpha_type;
+ typedef AFFINE_ affine_func_type;
+
+ typedef typename PEN_::value_type value_type;
+ typedef alpha_pen self_type;
+
+private:
+ alpha_type alpha_;
+
+protected:
+ affine_func_type affine_func_;
+
+public:
+ using PEN_::get_value;
+ using PEN_::get_pen_value;
+ using PEN_::inc_x;
+ using PEN_::dec_x;
+ using PEN_::inc_y;
+ using PEN_::dec_y;
+ using PEN_::clipped;
+ using PEN_::w_;
+ using PEN_::h_;
+ using PEN_::x_;
+ using PEN_::y_;
+
+ alpha_pen(const alpha_type &a = 1, const affine_func_type &func = affine_func_type()):alpha_(a),affine_func_(func) { }
+ alpha_pen(const PEN_ &x, const alpha_type &a=1, const affine_func_type &func=affine_func_type())
+ :PEN_(x),alpha_(a),affine_func_(func) { }
+
+ const alpha_type& get_alpha()const { return alpha_; }
+ void get_alpha(alpha_type &a) const { a=alpha_; }
+ void set_alpha(alpha_type a) { alpha_=a; }
+
+ void put_value(const value_type &v, alpha_type a=1)const
+ { PEN_::put_value(affine_func_(get_value(),v,alpha_*a)); }
+ void put_value()const { put_value(get_pen_value()); }
+ void put_value_alpha(alpha_type a)const { put_value(get_pen_value(),a); }
+ void put_hline(int l, const alpha_type &a = 1){for(;l>0;l--,inc_x())put_value_alpha(a);}
+
+ void put_value_clip(const value_type &v, alpha_type a=1)const
+ { if(!clipped())PEN_::put_value(affine_func_(get_value(),v,alpha_*a)); }
+ void put_value_clip()const { put_value_clip(get_pen_value()); }
+ void put_value_clip_alpha(alpha_type a)const { put_value_clip(get_pen_value(),a); }
+ void put_hline_clip(int l, const alpha_type &a = 1){l=std::min(l,w_-x_);for(;l>0;l--,inc_x())put_value_clip_alpha(a);}
+
+ //the put_block functions do not modify the pen
+ void put_block(int h, int w, const alpha_type &a = 1)
+ {
+ self_type row(*this);
+ for(;h>0;h--,row.inc_y())
+ {
+ self_type col(row);
+ col.put_hline(w,a);
+ }
+ }
+
+ void put_block_clip(int h, int w, const alpha_type &a = 1)
+ {
+ self_type row(*this);
+
+ //clip start position
+ if(row.x_ < 0) { w+=row.x_; row.inc_x(-row.x_); }
+ if(row.y_ < 0) { h+=row.y_; row.inc_y(-row.y_); }
+
+ //clip width and height of copy rect
+ h = std::min(h,h_-y_);
+ w = std::min(w,w_-x_);
+
+ //copy rect
+ for(;h>0;h--,row.inc_y())
+ {
+ self_type col(row);
+ col.put_hline(w,a); //already clipped
+ }
+ }
+};
+
+_ETL_END_NAMESPACE
+
+/* === E X T E R N S ======================================================= */
+
+/* === E N D =============================================================== */
+
+#endif
projects / synfig.git / blobdiff