1506 lines
51 KiB
C++
1506 lines
51 KiB
C++
//----------------------------------------------------------------------------
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// Anti-Grain Geometry - Version 2.4
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// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
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//
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// Permission to copy, use, modify, sell and distribute this software
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// is granted provided this copyright notice appears in all copies.
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// This software is provided "as is" without express or implied
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// warranty, and with no claim as to its suitability for any purpose.
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//
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//----------------------------------------------------------------------------
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// Contact: mcseem@antigrain.com
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// mcseemagg@yahoo.com
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// http://www.antigrain.com
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//----------------------------------------------------------------------------
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//
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// The Stack Blur Algorithm was invented by Mario Klingemann,
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// mario@quasimondo.com and described here:
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// http://incubator.quasimondo.com/processing/fast_blur_deluxe.php
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// (search phrase "Stackblur: Fast But Goodlooking").
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// The major improvement is that there's no more division table
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// that was very expensive to create for large blur radii. Insted,
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// for 8-bit per channel and radius not exceeding 254 the division is
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// replaced by multiplication and shift.
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//
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//----------------------------------------------------------------------------
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#ifndef AGG_BLUR_INCLUDED
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#define AGG_BLUR_INCLUDED
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#include <cstring>
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#include <cmath>
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#include "agg_array.h"
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#include "agg_pixfmt_base.h"
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#include "agg_pixfmt_transposer.h"
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namespace agg
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{
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template<class T> struct stack_blur_tables
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{
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static int16u const g_stack_blur8_mul[255];
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static int8u const g_stack_blur8_shr[255];
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};
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//------------------------------------------------------------------------
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template<class T>
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int16u const stack_blur_tables<T>::g_stack_blur8_mul[255] =
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{
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512,512,456,512,328,456,335,512,405,328,271,456,388,335,292,512,
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454,405,364,328,298,271,496,456,420,388,360,335,312,292,273,512,
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482,454,428,405,383,364,345,328,312,298,284,271,259,496,475,456,
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437,420,404,388,374,360,347,335,323,312,302,292,282,273,265,512,
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497,482,468,454,441,428,417,405,394,383,373,364,354,345,337,328,
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320,312,305,298,291,284,278,271,265,259,507,496,485,475,465,456,
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446,437,428,420,412,404,396,388,381,374,367,360,354,347,341,335,
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329,323,318,312,307,302,297,292,287,282,278,273,269,265,261,512,
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505,497,489,482,475,468,461,454,447,441,435,428,422,417,411,405,
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399,394,389,383,378,373,368,364,359,354,350,345,341,337,332,328,
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324,320,316,312,309,305,301,298,294,291,287,284,281,278,274,271,
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268,265,262,259,257,507,501,496,491,485,480,475,470,465,460,456,
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451,446,442,437,433,428,424,420,416,412,408,404,400,396,392,388,
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385,381,377,374,370,367,363,360,357,354,350,347,344,341,338,335,
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332,329,326,323,320,318,315,312,310,307,304,302,299,297,294,292,
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289,287,285,282,280,278,275,273,271,269,267,265,263,261,259
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};
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//------------------------------------------------------------------------
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template<class T>
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int8u const stack_blur_tables<T>::g_stack_blur8_shr[255] =
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{
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9, 11, 12, 13, 13, 14, 14, 15, 15, 15, 15, 16, 16, 16, 16, 17,
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17, 17, 17, 17, 17, 17, 18, 18, 18, 18, 18, 18, 18, 18, 18, 19,
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19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 20, 20, 20,
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20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 21,
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21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21,
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21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 22, 22, 22, 22, 22, 22,
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22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22,
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22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 23,
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23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23,
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23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23,
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23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23,
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23, 23, 23, 23, 23, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24,
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24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24,
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24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24,
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24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24,
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24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24
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};
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//==============================================================stack_blur
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template<class ColorT, class CalculatorT> class stack_blur
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{
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public:
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typedef ColorT color_type;
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typedef CalculatorT calculator_type;
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//--------------------------------------------------------------------
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template<class Img> void blur_x(Img& img, unsigned radius)
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{
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if(radius < 1) return;
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unsigned x, y, xp, i;
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unsigned stack_ptr;
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unsigned stack_start;
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color_type pix;
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color_type* stack_pix;
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calculator_type sum;
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calculator_type sum_in;
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calculator_type sum_out;
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unsigned w = img.width();
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unsigned h = img.height();
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unsigned wm = w - 1;
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unsigned div = radius * 2 + 1;
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unsigned div_sum = (radius + 1) * (radius + 1);
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unsigned mul_sum = 0;
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unsigned shr_sum = 0;
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unsigned max_val = color_type::base_mask;
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if(max_val <= 255 && radius < 255)
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{
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mul_sum = stack_blur_tables<int>::g_stack_blur8_mul[radius];
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shr_sum = stack_blur_tables<int>::g_stack_blur8_shr[radius];
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}
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m_buf.allocate(w, 128);
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m_stack.allocate(div, 32);
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for(y = 0; y < h; y++)
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{
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sum.clear();
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sum_in.clear();
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sum_out.clear();
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pix = img.pixel(0, y);
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for(i = 0; i <= radius; i++)
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{
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m_stack[i] = pix;
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sum.add(pix, i + 1);
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sum_out.add(pix);
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}
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for(i = 1; i <= radius; i++)
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{
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pix = img.pixel((i > wm) ? wm : i, y);
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m_stack[i + radius] = pix;
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sum.add(pix, radius + 1 - i);
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sum_in.add(pix);
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}
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stack_ptr = radius;
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for(x = 0; x < w; x++)
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{
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if(mul_sum) sum.calc_pix(m_buf[x], mul_sum, shr_sum);
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else sum.calc_pix(m_buf[x], div_sum);
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sum.sub(sum_out);
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stack_start = stack_ptr + div - radius;
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if(stack_start >= div) stack_start -= div;
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stack_pix = &m_stack[stack_start];
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sum_out.sub(*stack_pix);
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xp = x + radius + 1;
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if(xp > wm) xp = wm;
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pix = img.pixel(xp, y);
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*stack_pix = pix;
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sum_in.add(pix);
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sum.add(sum_in);
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++stack_ptr;
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if(stack_ptr >= div) stack_ptr = 0;
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stack_pix = &m_stack[stack_ptr];
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sum_out.add(*stack_pix);
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sum_in.sub(*stack_pix);
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}
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img.copy_color_hspan(0, y, w, &m_buf[0]);
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}
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}
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//--------------------------------------------------------------------
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template<class Img> void blur_y(Img& img, unsigned radius)
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{
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pixfmt_transposer<Img> img2(img);
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blur_x(img2, radius);
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}
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//--------------------------------------------------------------------
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template<class Img> void blur(Img& img, unsigned radius)
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{
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blur_x(img, radius);
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pixfmt_transposer<Img> img2(img);
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blur_x(img2, radius);
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}
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private:
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pod_vector<color_type> m_buf;
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pod_vector<color_type> m_stack;
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};
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//====================================================stack_blur_calc_rgba
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template<class T=unsigned> struct stack_blur_calc_rgba
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{
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typedef T value_type;
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value_type r,g,b,a;
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AGG_INLINE void clear()
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{
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r = g = b = a = 0;
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}
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template<class ArgT> AGG_INLINE void add(const ArgT& v)
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{
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r += v.r;
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g += v.g;
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b += v.b;
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a += v.a;
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}
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template<class ArgT> AGG_INLINE void add(const ArgT& v, unsigned k)
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{
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r += v.r * k;
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g += v.g * k;
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b += v.b * k;
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a += v.a * k;
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}
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template<class ArgT> AGG_INLINE void sub(const ArgT& v)
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{
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r -= v.r;
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g -= v.g;
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b -= v.b;
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a -= v.a;
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}
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template<class ArgT> AGG_INLINE void calc_pix(ArgT& v, unsigned div)
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{
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typedef typename ArgT::value_type value_type;
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v.r = value_type(r / div);
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v.g = value_type(g / div);
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v.b = value_type(b / div);
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v.a = value_type(a / div);
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}
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template<class ArgT>
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AGG_INLINE void calc_pix(ArgT& v, unsigned mul, unsigned shr)
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{
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typedef typename ArgT::value_type value_type;
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v.r = value_type((r * mul) >> shr);
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v.g = value_type((g * mul) >> shr);
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v.b = value_type((b * mul) >> shr);
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v.a = value_type((a * mul) >> shr);
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}
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};
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//=====================================================stack_blur_calc_rgb
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template<class T=unsigned> struct stack_blur_calc_rgb
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{
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typedef T value_type;
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value_type r,g,b;
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AGG_INLINE void clear()
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{
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r = g = b = 0;
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}
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template<class ArgT> AGG_INLINE void add(const ArgT& v)
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{
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r += v.r;
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g += v.g;
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b += v.b;
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}
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template<class ArgT> AGG_INLINE void add(const ArgT& v, unsigned k)
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{
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r += v.r * k;
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g += v.g * k;
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b += v.b * k;
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}
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template<class ArgT> AGG_INLINE void sub(const ArgT& v)
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{
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r -= v.r;
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g -= v.g;
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b -= v.b;
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}
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template<class ArgT> AGG_INLINE void calc_pix(ArgT& v, unsigned div)
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{
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typedef typename ArgT::value_type value_type;
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v.r = value_type(r / div);
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v.g = value_type(g / div);
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v.b = value_type(b / div);
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}
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template<class ArgT>
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AGG_INLINE void calc_pix(ArgT& v, unsigned mul, unsigned shr)
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{
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typedef typename ArgT::value_type value_type;
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v.r = value_type((r * mul) >> shr);
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v.g = value_type((g * mul) >> shr);
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v.b = value_type((b * mul) >> shr);
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}
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};
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//====================================================stack_blur_calc_gray
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template<class T=unsigned> struct stack_blur_calc_gray
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{
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typedef T value_type;
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value_type v;
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AGG_INLINE void clear()
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{
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v = 0;
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}
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template<class ArgT> AGG_INLINE void add(const ArgT& a)
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{
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v += a.v;
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}
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template<class ArgT> AGG_INLINE void add(const ArgT& a, unsigned k)
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{
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v += a.v * k;
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}
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template<class ArgT> AGG_INLINE void sub(const ArgT& a)
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{
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v -= a.v;
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}
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template<class ArgT> AGG_INLINE void calc_pix(ArgT& a, unsigned div)
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{
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typedef typename ArgT::value_type value_type;
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a.v = value_type(v / div);
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}
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template<class ArgT>
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AGG_INLINE void calc_pix(ArgT& a, unsigned mul, unsigned shr)
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{
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typedef typename ArgT::value_type value_type;
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a.v = value_type((v * mul) >> shr);
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}
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};
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//========================================================stack_blur_gray8
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template<class Img>
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void stack_blur_gray8(Img& img, unsigned rx, unsigned ry)
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{
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unsigned x, y, xp, yp, i;
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unsigned stack_ptr;
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unsigned stack_start;
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const int8u* src_pix_ptr;
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int8u* dst_pix_ptr;
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unsigned pix;
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unsigned stack_pix;
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unsigned sum;
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unsigned sum_in;
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unsigned sum_out;
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unsigned w = img.width();
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unsigned h = img.height();
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unsigned wm = w - 1;
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unsigned hm = h - 1;
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unsigned div;
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unsigned mul_sum;
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unsigned shr_sum;
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pod_vector<int8u> stack;
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if(rx > 0)
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{
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if(rx > 254) rx = 254;
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div = rx * 2 + 1;
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mul_sum = stack_blur_tables<int>::g_stack_blur8_mul[rx];
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shr_sum = stack_blur_tables<int>::g_stack_blur8_shr[rx];
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stack.allocate(div);
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for(y = 0; y < h; y++)
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{
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sum = sum_in = sum_out = 0;
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src_pix_ptr = img.pix_ptr(0, y);
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pix = *src_pix_ptr;
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for(i = 0; i <= rx; i++)
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{
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stack[i] = pix;
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sum += pix * (i + 1);
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sum_out += pix;
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}
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for(i = 1; i <= rx; i++)
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{
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if(i <= wm) src_pix_ptr += Img::pix_width;
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pix = *src_pix_ptr;
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stack[i + rx] = pix;
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sum += pix * (rx + 1 - i);
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sum_in += pix;
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}
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stack_ptr = rx;
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xp = rx;
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if(xp > wm) xp = wm;
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src_pix_ptr = img.pix_ptr(xp, y);
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dst_pix_ptr = img.pix_ptr(0, y);
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for(x = 0; x < w; x++)
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{
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*dst_pix_ptr = (sum * mul_sum) >> shr_sum;
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dst_pix_ptr += Img::pix_width;
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sum -= sum_out;
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stack_start = stack_ptr + div - rx;
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if(stack_start >= div) stack_start -= div;
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sum_out -= stack[stack_start];
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if(xp < wm)
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{
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src_pix_ptr += Img::pix_width;
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pix = *src_pix_ptr;
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++xp;
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}
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stack[stack_start] = pix;
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sum_in += pix;
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sum += sum_in;
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++stack_ptr;
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if(stack_ptr >= div) stack_ptr = 0;
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stack_pix = stack[stack_ptr];
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sum_out += stack_pix;
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sum_in -= stack_pix;
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}
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}
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}
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if(ry > 0)
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{
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if(ry > 254) ry = 254;
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div = ry * 2 + 1;
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mul_sum = stack_blur_tables<int>::g_stack_blur8_mul[ry];
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shr_sum = stack_blur_tables<int>::g_stack_blur8_shr[ry];
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stack.allocate(div);
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int stride = img.stride();
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for(x = 0; x < w; x++)
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{
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sum = sum_in = sum_out = 0;
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src_pix_ptr = img.pix_ptr(x, 0);
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pix = *src_pix_ptr;
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for(i = 0; i <= ry; i++)
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{
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stack[i] = pix;
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sum += pix * (i + 1);
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sum_out += pix;
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}
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for(i = 1; i <= ry; i++)
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{
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if(i <= hm) src_pix_ptr += stride;
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pix = *src_pix_ptr;
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stack[i + ry] = pix;
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sum += pix * (ry + 1 - i);
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sum_in += pix;
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}
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stack_ptr = ry;
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yp = ry;
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if(yp > hm) yp = hm;
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src_pix_ptr = img.pix_ptr(x, yp);
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dst_pix_ptr = img.pix_ptr(x, 0);
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for(y = 0; y < h; y++)
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{
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*dst_pix_ptr = (sum * mul_sum) >> shr_sum;
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dst_pix_ptr += stride;
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sum -= sum_out;
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stack_start = stack_ptr + div - ry;
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if(stack_start >= div) stack_start -= div;
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sum_out -= stack[stack_start];
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if(yp < hm)
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{
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src_pix_ptr += stride;
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pix = *src_pix_ptr;
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++yp;
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}
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stack[stack_start] = pix;
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sum_in += pix;
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sum += sum_in;
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|
|
|
++stack_ptr;
|
|
if(stack_ptr >= div) stack_ptr = 0;
|
|
stack_pix = stack[stack_ptr];
|
|
|
|
sum_out += stack_pix;
|
|
sum_in -= stack_pix;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
|
|
//========================================================stack_blur_rgb24
|
|
template<class Img>
|
|
void stack_blur_rgb24(Img& img, unsigned rx, unsigned ry)
|
|
{
|
|
typedef typename Img::color_type color_type;
|
|
typedef typename Img::order_type order_type;
|
|
enum order_e
|
|
{
|
|
R = order_type::R,
|
|
G = order_type::G,
|
|
B = order_type::B
|
|
};
|
|
|
|
unsigned x, y, xp, yp, i;
|
|
unsigned stack_ptr;
|
|
unsigned stack_start;
|
|
|
|
const int8u* src_pix_ptr;
|
|
int8u* dst_pix_ptr;
|
|
color_type* stack_pix_ptr;
|
|
|
|
unsigned sum_r;
|
|
unsigned sum_g;
|
|
unsigned sum_b;
|
|
unsigned sum_in_r;
|
|
unsigned sum_in_g;
|
|
unsigned sum_in_b;
|
|
unsigned sum_out_r;
|
|
unsigned sum_out_g;
|
|
unsigned sum_out_b;
|
|
|
|
unsigned w = img.width();
|
|
unsigned h = img.height();
|
|
unsigned wm = w - 1;
|
|
unsigned hm = h - 1;
|
|
|
|
unsigned div;
|
|
unsigned mul_sum;
|
|
unsigned shr_sum;
|
|
|
|
pod_vector<color_type> stack;
|
|
|
|
if(rx > 0)
|
|
{
|
|
if(rx > 254) rx = 254;
|
|
div = rx * 2 + 1;
|
|
mul_sum = stack_blur_tables<int>::g_stack_blur8_mul[rx];
|
|
shr_sum = stack_blur_tables<int>::g_stack_blur8_shr[rx];
|
|
stack.allocate(div);
|
|
|
|
for(y = 0; y < h; y++)
|
|
{
|
|
sum_r =
|
|
sum_g =
|
|
sum_b =
|
|
sum_in_r =
|
|
sum_in_g =
|
|
sum_in_b =
|
|
sum_out_r =
|
|
sum_out_g =
|
|
sum_out_b = 0;
|
|
|
|
src_pix_ptr = img.pix_ptr(0, y);
|
|
for(i = 0; i <= rx; i++)
|
|
{
|
|
stack_pix_ptr = &stack[i];
|
|
stack_pix_ptr->r = src_pix_ptr[R];
|
|
stack_pix_ptr->g = src_pix_ptr[G];
|
|
stack_pix_ptr->b = src_pix_ptr[B];
|
|
sum_r += src_pix_ptr[R] * (i + 1);
|
|
sum_g += src_pix_ptr[G] * (i + 1);
|
|
sum_b += src_pix_ptr[B] * (i + 1);
|
|
sum_out_r += src_pix_ptr[R];
|
|
sum_out_g += src_pix_ptr[G];
|
|
sum_out_b += src_pix_ptr[B];
|
|
}
|
|
for(i = 1; i <= rx; i++)
|
|
{
|
|
if(i <= wm) src_pix_ptr += Img::pix_width;
|
|
stack_pix_ptr = &stack[i + rx];
|
|
stack_pix_ptr->r = src_pix_ptr[R];
|
|
stack_pix_ptr->g = src_pix_ptr[G];
|
|
stack_pix_ptr->b = src_pix_ptr[B];
|
|
sum_r += src_pix_ptr[R] * (rx + 1 - i);
|
|
sum_g += src_pix_ptr[G] * (rx + 1 - i);
|
|
sum_b += src_pix_ptr[B] * (rx + 1 - i);
|
|
sum_in_r += src_pix_ptr[R];
|
|
sum_in_g += src_pix_ptr[G];
|
|
sum_in_b += src_pix_ptr[B];
|
|
}
|
|
|
|
stack_ptr = rx;
|
|
xp = rx;
|
|
if(xp > wm) xp = wm;
|
|
src_pix_ptr = img.pix_ptr(xp, y);
|
|
dst_pix_ptr = img.pix_ptr(0, y);
|
|
for(x = 0; x < w; x++)
|
|
{
|
|
dst_pix_ptr[R] = (sum_r * mul_sum) >> shr_sum;
|
|
dst_pix_ptr[G] = (sum_g * mul_sum) >> shr_sum;
|
|
dst_pix_ptr[B] = (sum_b * mul_sum) >> shr_sum;
|
|
dst_pix_ptr += Img::pix_width;
|
|
|
|
sum_r -= sum_out_r;
|
|
sum_g -= sum_out_g;
|
|
sum_b -= sum_out_b;
|
|
|
|
stack_start = stack_ptr + div - rx;
|
|
if(stack_start >= div) stack_start -= div;
|
|
stack_pix_ptr = &stack[stack_start];
|
|
|
|
sum_out_r -= stack_pix_ptr->r;
|
|
sum_out_g -= stack_pix_ptr->g;
|
|
sum_out_b -= stack_pix_ptr->b;
|
|
|
|
if(xp < wm)
|
|
{
|
|
src_pix_ptr += Img::pix_width;
|
|
++xp;
|
|
}
|
|
|
|
stack_pix_ptr->r = src_pix_ptr[R];
|
|
stack_pix_ptr->g = src_pix_ptr[G];
|
|
stack_pix_ptr->b = src_pix_ptr[B];
|
|
|
|
sum_in_r += src_pix_ptr[R];
|
|
sum_in_g += src_pix_ptr[G];
|
|
sum_in_b += src_pix_ptr[B];
|
|
sum_r += sum_in_r;
|
|
sum_g += sum_in_g;
|
|
sum_b += sum_in_b;
|
|
|
|
++stack_ptr;
|
|
if(stack_ptr >= div) stack_ptr = 0;
|
|
stack_pix_ptr = &stack[stack_ptr];
|
|
|
|
sum_out_r += stack_pix_ptr->r;
|
|
sum_out_g += stack_pix_ptr->g;
|
|
sum_out_b += stack_pix_ptr->b;
|
|
sum_in_r -= stack_pix_ptr->r;
|
|
sum_in_g -= stack_pix_ptr->g;
|
|
sum_in_b -= stack_pix_ptr->b;
|
|
}
|
|
}
|
|
}
|
|
|
|
if(ry > 0)
|
|
{
|
|
if(ry > 254) ry = 254;
|
|
div = ry * 2 + 1;
|
|
mul_sum = stack_blur_tables<int>::g_stack_blur8_mul[ry];
|
|
shr_sum = stack_blur_tables<int>::g_stack_blur8_shr[ry];
|
|
stack.allocate(div);
|
|
|
|
int stride = img.stride();
|
|
for(x = 0; x < w; x++)
|
|
{
|
|
sum_r =
|
|
sum_g =
|
|
sum_b =
|
|
sum_in_r =
|
|
sum_in_g =
|
|
sum_in_b =
|
|
sum_out_r =
|
|
sum_out_g =
|
|
sum_out_b = 0;
|
|
|
|
src_pix_ptr = img.pix_ptr(x, 0);
|
|
for(i = 0; i <= ry; i++)
|
|
{
|
|
stack_pix_ptr = &stack[i];
|
|
stack_pix_ptr->r = src_pix_ptr[R];
|
|
stack_pix_ptr->g = src_pix_ptr[G];
|
|
stack_pix_ptr->b = src_pix_ptr[B];
|
|
sum_r += src_pix_ptr[R] * (i + 1);
|
|
sum_g += src_pix_ptr[G] * (i + 1);
|
|
sum_b += src_pix_ptr[B] * (i + 1);
|
|
sum_out_r += src_pix_ptr[R];
|
|
sum_out_g += src_pix_ptr[G];
|
|
sum_out_b += src_pix_ptr[B];
|
|
}
|
|
for(i = 1; i <= ry; i++)
|
|
{
|
|
if(i <= hm) src_pix_ptr += stride;
|
|
stack_pix_ptr = &stack[i + ry];
|
|
stack_pix_ptr->r = src_pix_ptr[R];
|
|
stack_pix_ptr->g = src_pix_ptr[G];
|
|
stack_pix_ptr->b = src_pix_ptr[B];
|
|
sum_r += src_pix_ptr[R] * (ry + 1 - i);
|
|
sum_g += src_pix_ptr[G] * (ry + 1 - i);
|
|
sum_b += src_pix_ptr[B] * (ry + 1 - i);
|
|
sum_in_r += src_pix_ptr[R];
|
|
sum_in_g += src_pix_ptr[G];
|
|
sum_in_b += src_pix_ptr[B];
|
|
}
|
|
|
|
stack_ptr = ry;
|
|
yp = ry;
|
|
if(yp > hm) yp = hm;
|
|
src_pix_ptr = img.pix_ptr(x, yp);
|
|
dst_pix_ptr = img.pix_ptr(x, 0);
|
|
for(y = 0; y < h; y++)
|
|
{
|
|
dst_pix_ptr[R] = (sum_r * mul_sum) >> shr_sum;
|
|
dst_pix_ptr[G] = (sum_g * mul_sum) >> shr_sum;
|
|
dst_pix_ptr[B] = (sum_b * mul_sum) >> shr_sum;
|
|
dst_pix_ptr += stride;
|
|
|
|
sum_r -= sum_out_r;
|
|
sum_g -= sum_out_g;
|
|
sum_b -= sum_out_b;
|
|
|
|
stack_start = stack_ptr + div - ry;
|
|
if(stack_start >= div) stack_start -= div;
|
|
|
|
stack_pix_ptr = &stack[stack_start];
|
|
sum_out_r -= stack_pix_ptr->r;
|
|
sum_out_g -= stack_pix_ptr->g;
|
|
sum_out_b -= stack_pix_ptr->b;
|
|
|
|
if(yp < hm)
|
|
{
|
|
src_pix_ptr += stride;
|
|
++yp;
|
|
}
|
|
|
|
stack_pix_ptr->r = src_pix_ptr[R];
|
|
stack_pix_ptr->g = src_pix_ptr[G];
|
|
stack_pix_ptr->b = src_pix_ptr[B];
|
|
|
|
sum_in_r += src_pix_ptr[R];
|
|
sum_in_g += src_pix_ptr[G];
|
|
sum_in_b += src_pix_ptr[B];
|
|
sum_r += sum_in_r;
|
|
sum_g += sum_in_g;
|
|
sum_b += sum_in_b;
|
|
|
|
++stack_ptr;
|
|
if(stack_ptr >= div) stack_ptr = 0;
|
|
stack_pix_ptr = &stack[stack_ptr];
|
|
|
|
sum_out_r += stack_pix_ptr->r;
|
|
sum_out_g += stack_pix_ptr->g;
|
|
sum_out_b += stack_pix_ptr->b;
|
|
sum_in_r -= stack_pix_ptr->r;
|
|
sum_in_g -= stack_pix_ptr->g;
|
|
sum_in_b -= stack_pix_ptr->b;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
|
|
//=======================================================stack_blur_rgba32
|
|
template<class Img>
|
|
void stack_blur_rgba32(Img& img, unsigned rx, unsigned ry)
|
|
{
|
|
typedef typename Img::color_type color_type;
|
|
typedef typename Img::order_type order_type;
|
|
enum order_e
|
|
{
|
|
R = order_type::R,
|
|
G = order_type::G,
|
|
B = order_type::B,
|
|
A = order_type::A
|
|
};
|
|
|
|
unsigned x, y, xp, yp, i;
|
|
unsigned stack_ptr;
|
|
unsigned stack_start;
|
|
|
|
const int8u* src_pix_ptr;
|
|
int8u* dst_pix_ptr;
|
|
color_type* stack_pix_ptr;
|
|
|
|
unsigned sum_r;
|
|
unsigned sum_g;
|
|
unsigned sum_b;
|
|
unsigned sum_a;
|
|
unsigned sum_in_r;
|
|
unsigned sum_in_g;
|
|
unsigned sum_in_b;
|
|
unsigned sum_in_a;
|
|
unsigned sum_out_r;
|
|
unsigned sum_out_g;
|
|
unsigned sum_out_b;
|
|
unsigned sum_out_a;
|
|
|
|
unsigned w = img.width();
|
|
unsigned h = img.height();
|
|
unsigned wm = w - 1;
|
|
unsigned hm = h - 1;
|
|
|
|
unsigned div;
|
|
unsigned mul_sum;
|
|
unsigned shr_sum;
|
|
|
|
pod_vector<color_type> stack;
|
|
|
|
if(rx > 0)
|
|
{
|
|
if(rx > 254) rx = 254;
|
|
div = rx * 2 + 1;
|
|
mul_sum = stack_blur_tables<int>::g_stack_blur8_mul[rx];
|
|
shr_sum = stack_blur_tables<int>::g_stack_blur8_shr[rx];
|
|
stack.allocate(div);
|
|
|
|
for(y = 0; y < h; y++)
|
|
{
|
|
sum_r =
|
|
sum_g =
|
|
sum_b =
|
|
sum_a =
|
|
sum_in_r =
|
|
sum_in_g =
|
|
sum_in_b =
|
|
sum_in_a =
|
|
sum_out_r =
|
|
sum_out_g =
|
|
sum_out_b =
|
|
sum_out_a = 0;
|
|
|
|
src_pix_ptr = img.pix_ptr(0, y);
|
|
for(i = 0; i <= rx; i++)
|
|
{
|
|
stack_pix_ptr = &stack[i];
|
|
stack_pix_ptr->r = src_pix_ptr[R];
|
|
stack_pix_ptr->g = src_pix_ptr[G];
|
|
stack_pix_ptr->b = src_pix_ptr[B];
|
|
stack_pix_ptr->a = src_pix_ptr[A];
|
|
sum_r += src_pix_ptr[R] * (i + 1);
|
|
sum_g += src_pix_ptr[G] * (i + 1);
|
|
sum_b += src_pix_ptr[B] * (i + 1);
|
|
sum_a += src_pix_ptr[A] * (i + 1);
|
|
sum_out_r += src_pix_ptr[R];
|
|
sum_out_g += src_pix_ptr[G];
|
|
sum_out_b += src_pix_ptr[B];
|
|
sum_out_a += src_pix_ptr[A];
|
|
}
|
|
for(i = 1; i <= rx; i++)
|
|
{
|
|
if(i <= wm) src_pix_ptr += Img::pix_width;
|
|
stack_pix_ptr = &stack[i + rx];
|
|
stack_pix_ptr->r = src_pix_ptr[R];
|
|
stack_pix_ptr->g = src_pix_ptr[G];
|
|
stack_pix_ptr->b = src_pix_ptr[B];
|
|
stack_pix_ptr->a = src_pix_ptr[A];
|
|
sum_r += src_pix_ptr[R] * (rx + 1 - i);
|
|
sum_g += src_pix_ptr[G] * (rx + 1 - i);
|
|
sum_b += src_pix_ptr[B] * (rx + 1 - i);
|
|
sum_a += src_pix_ptr[A] * (rx + 1 - i);
|
|
sum_in_r += src_pix_ptr[R];
|
|
sum_in_g += src_pix_ptr[G];
|
|
sum_in_b += src_pix_ptr[B];
|
|
sum_in_a += src_pix_ptr[A];
|
|
}
|
|
|
|
stack_ptr = rx;
|
|
xp = rx;
|
|
if(xp > wm) xp = wm;
|
|
src_pix_ptr = img.pix_ptr(xp, y);
|
|
dst_pix_ptr = img.pix_ptr(0, y);
|
|
for(x = 0; x < w; x++)
|
|
{
|
|
dst_pix_ptr[R] = (sum_r * mul_sum) >> shr_sum;
|
|
dst_pix_ptr[G] = (sum_g * mul_sum) >> shr_sum;
|
|
dst_pix_ptr[B] = (sum_b * mul_sum) >> shr_sum;
|
|
dst_pix_ptr[A] = (sum_a * mul_sum) >> shr_sum;
|
|
dst_pix_ptr += Img::pix_width;
|
|
|
|
sum_r -= sum_out_r;
|
|
sum_g -= sum_out_g;
|
|
sum_b -= sum_out_b;
|
|
sum_a -= sum_out_a;
|
|
|
|
stack_start = stack_ptr + div - rx;
|
|
if(stack_start >= div) stack_start -= div;
|
|
stack_pix_ptr = &stack[stack_start];
|
|
|
|
sum_out_r -= stack_pix_ptr->r;
|
|
sum_out_g -= stack_pix_ptr->g;
|
|
sum_out_b -= stack_pix_ptr->b;
|
|
sum_out_a -= stack_pix_ptr->a;
|
|
|
|
if(xp < wm)
|
|
{
|
|
src_pix_ptr += Img::pix_width;
|
|
++xp;
|
|
}
|
|
|
|
stack_pix_ptr->r = src_pix_ptr[R];
|
|
stack_pix_ptr->g = src_pix_ptr[G];
|
|
stack_pix_ptr->b = src_pix_ptr[B];
|
|
stack_pix_ptr->a = src_pix_ptr[A];
|
|
|
|
sum_in_r += src_pix_ptr[R];
|
|
sum_in_g += src_pix_ptr[G];
|
|
sum_in_b += src_pix_ptr[B];
|
|
sum_in_a += src_pix_ptr[A];
|
|
sum_r += sum_in_r;
|
|
sum_g += sum_in_g;
|
|
sum_b += sum_in_b;
|
|
sum_a += sum_in_a;
|
|
|
|
++stack_ptr;
|
|
if(stack_ptr >= div) stack_ptr = 0;
|
|
stack_pix_ptr = &stack[stack_ptr];
|
|
|
|
sum_out_r += stack_pix_ptr->r;
|
|
sum_out_g += stack_pix_ptr->g;
|
|
sum_out_b += stack_pix_ptr->b;
|
|
sum_out_a += stack_pix_ptr->a;
|
|
sum_in_r -= stack_pix_ptr->r;
|
|
sum_in_g -= stack_pix_ptr->g;
|
|
sum_in_b -= stack_pix_ptr->b;
|
|
sum_in_a -= stack_pix_ptr->a;
|
|
}
|
|
}
|
|
}
|
|
|
|
if(ry > 0)
|
|
{
|
|
if(ry > 254) ry = 254;
|
|
div = ry * 2 + 1;
|
|
mul_sum = stack_blur_tables<int>::g_stack_blur8_mul[ry];
|
|
shr_sum = stack_blur_tables<int>::g_stack_blur8_shr[ry];
|
|
stack.allocate(div);
|
|
|
|
int stride = img.stride();
|
|
for(x = 0; x < w; x++)
|
|
{
|
|
sum_r =
|
|
sum_g =
|
|
sum_b =
|
|
sum_a =
|
|
sum_in_r =
|
|
sum_in_g =
|
|
sum_in_b =
|
|
sum_in_a =
|
|
sum_out_r =
|
|
sum_out_g =
|
|
sum_out_b =
|
|
sum_out_a = 0;
|
|
|
|
src_pix_ptr = img.pix_ptr(x, 0);
|
|
for(i = 0; i <= ry; i++)
|
|
{
|
|
stack_pix_ptr = &stack[i];
|
|
stack_pix_ptr->r = src_pix_ptr[R];
|
|
stack_pix_ptr->g = src_pix_ptr[G];
|
|
stack_pix_ptr->b = src_pix_ptr[B];
|
|
stack_pix_ptr->a = src_pix_ptr[A];
|
|
sum_r += src_pix_ptr[R] * (i + 1);
|
|
sum_g += src_pix_ptr[G] * (i + 1);
|
|
sum_b += src_pix_ptr[B] * (i + 1);
|
|
sum_a += src_pix_ptr[A] * (i + 1);
|
|
sum_out_r += src_pix_ptr[R];
|
|
sum_out_g += src_pix_ptr[G];
|
|
sum_out_b += src_pix_ptr[B];
|
|
sum_out_a += src_pix_ptr[A];
|
|
}
|
|
for(i = 1; i <= ry; i++)
|
|
{
|
|
if(i <= hm) src_pix_ptr += stride;
|
|
stack_pix_ptr = &stack[i + ry];
|
|
stack_pix_ptr->r = src_pix_ptr[R];
|
|
stack_pix_ptr->g = src_pix_ptr[G];
|
|
stack_pix_ptr->b = src_pix_ptr[B];
|
|
stack_pix_ptr->a = src_pix_ptr[A];
|
|
sum_r += src_pix_ptr[R] * (ry + 1 - i);
|
|
sum_g += src_pix_ptr[G] * (ry + 1 - i);
|
|
sum_b += src_pix_ptr[B] * (ry + 1 - i);
|
|
sum_a += src_pix_ptr[A] * (ry + 1 - i);
|
|
sum_in_r += src_pix_ptr[R];
|
|
sum_in_g += src_pix_ptr[G];
|
|
sum_in_b += src_pix_ptr[B];
|
|
sum_in_a += src_pix_ptr[A];
|
|
}
|
|
|
|
stack_ptr = ry;
|
|
yp = ry;
|
|
if(yp > hm) yp = hm;
|
|
src_pix_ptr = img.pix_ptr(x, yp);
|
|
dst_pix_ptr = img.pix_ptr(x, 0);
|
|
for(y = 0; y < h; y++)
|
|
{
|
|
dst_pix_ptr[R] = (sum_r * mul_sum) >> shr_sum;
|
|
dst_pix_ptr[G] = (sum_g * mul_sum) >> shr_sum;
|
|
dst_pix_ptr[B] = (sum_b * mul_sum) >> shr_sum;
|
|
dst_pix_ptr[A] = (sum_a * mul_sum) >> shr_sum;
|
|
dst_pix_ptr += stride;
|
|
|
|
sum_r -= sum_out_r;
|
|
sum_g -= sum_out_g;
|
|
sum_b -= sum_out_b;
|
|
sum_a -= sum_out_a;
|
|
|
|
stack_start = stack_ptr + div - ry;
|
|
if(stack_start >= div) stack_start -= div;
|
|
|
|
stack_pix_ptr = &stack[stack_start];
|
|
sum_out_r -= stack_pix_ptr->r;
|
|
sum_out_g -= stack_pix_ptr->g;
|
|
sum_out_b -= stack_pix_ptr->b;
|
|
sum_out_a -= stack_pix_ptr->a;
|
|
|
|
if(yp < hm)
|
|
{
|
|
src_pix_ptr += stride;
|
|
++yp;
|
|
}
|
|
|
|
stack_pix_ptr->r = src_pix_ptr[R];
|
|
stack_pix_ptr->g = src_pix_ptr[G];
|
|
stack_pix_ptr->b = src_pix_ptr[B];
|
|
stack_pix_ptr->a = src_pix_ptr[A];
|
|
|
|
sum_in_r += src_pix_ptr[R];
|
|
sum_in_g += src_pix_ptr[G];
|
|
sum_in_b += src_pix_ptr[B];
|
|
sum_in_a += src_pix_ptr[A];
|
|
sum_r += sum_in_r;
|
|
sum_g += sum_in_g;
|
|
sum_b += sum_in_b;
|
|
sum_a += sum_in_a;
|
|
|
|
++stack_ptr;
|
|
if(stack_ptr >= div) stack_ptr = 0;
|
|
stack_pix_ptr = &stack[stack_ptr];
|
|
|
|
sum_out_r += stack_pix_ptr->r;
|
|
sum_out_g += stack_pix_ptr->g;
|
|
sum_out_b += stack_pix_ptr->b;
|
|
sum_out_a += stack_pix_ptr->a;
|
|
sum_in_r -= stack_pix_ptr->r;
|
|
sum_in_g -= stack_pix_ptr->g;
|
|
sum_in_b -= stack_pix_ptr->b;
|
|
sum_in_a -= stack_pix_ptr->a;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
|
|
//===========================================================recursive_blur
|
|
template<class ColorT, class CalculatorT> class recursive_blur
|
|
{
|
|
public:
|
|
typedef ColorT color_type;
|
|
typedef CalculatorT calculator_type;
|
|
typedef typename color_type::value_type value_type;
|
|
typedef typename calculator_type::value_type calc_type;
|
|
|
|
//--------------------------------------------------------------------
|
|
template<class Img> void blur_x(Img& img, double radius)
|
|
{
|
|
if(radius < 0.62) return;
|
|
if(img.width() < 3) return;
|
|
|
|
calc_type s = calc_type(radius * 0.5);
|
|
calc_type q = calc_type((s < 2.5) ?
|
|
3.97156 - 4.14554 * std::sqrt(1 - 0.26891 * s) :
|
|
0.98711 * s - 0.96330);
|
|
|
|
calc_type q2 = calc_type(q * q);
|
|
calc_type q3 = calc_type(q2 * q);
|
|
|
|
calc_type b0 = calc_type(1.0 / (1.578250 +
|
|
2.444130 * q +
|
|
1.428100 * q2 +
|
|
0.422205 * q3));
|
|
|
|
calc_type b1 = calc_type( 2.44413 * q +
|
|
2.85619 * q2 +
|
|
1.26661 * q3);
|
|
|
|
calc_type b2 = calc_type(-1.42810 * q2 +
|
|
-1.26661 * q3);
|
|
|
|
calc_type b3 = calc_type(0.422205 * q3);
|
|
|
|
calc_type b = calc_type(1 - (b1 + b2 + b3) * b0);
|
|
|
|
b1 *= b0;
|
|
b2 *= b0;
|
|
b3 *= b0;
|
|
|
|
int w = img.width();
|
|
int h = img.height();
|
|
int wm = w-1;
|
|
int x, y;
|
|
|
|
m_sum1.allocate(w);
|
|
m_sum2.allocate(w);
|
|
m_buf.allocate(w);
|
|
|
|
for(y = 0; y < h; y++)
|
|
{
|
|
calculator_type c;
|
|
c.from_pix(img.pixel(0, y));
|
|
m_sum1[0].calc(b, b1, b2, b3, c, c, c, c);
|
|
c.from_pix(img.pixel(1, y));
|
|
m_sum1[1].calc(b, b1, b2, b3, c, m_sum1[0], m_sum1[0], m_sum1[0]);
|
|
c.from_pix(img.pixel(2, y));
|
|
m_sum1[2].calc(b, b1, b2, b3, c, m_sum1[1], m_sum1[0], m_sum1[0]);
|
|
|
|
for(x = 3; x < w; ++x)
|
|
{
|
|
c.from_pix(img.pixel(x, y));
|
|
m_sum1[x].calc(b, b1, b2, b3, c, m_sum1[x-1], m_sum1[x-2], m_sum1[x-3]);
|
|
}
|
|
|
|
m_sum2[wm ].calc(b, b1, b2, b3, m_sum1[wm ], m_sum1[wm ], m_sum1[wm], m_sum1[wm]);
|
|
m_sum2[wm-1].calc(b, b1, b2, b3, m_sum1[wm-1], m_sum2[wm ], m_sum2[wm], m_sum2[wm]);
|
|
m_sum2[wm-2].calc(b, b1, b2, b3, m_sum1[wm-2], m_sum2[wm-1], m_sum2[wm], m_sum2[wm]);
|
|
m_sum2[wm ].to_pix(m_buf[wm ]);
|
|
m_sum2[wm-1].to_pix(m_buf[wm-1]);
|
|
m_sum2[wm-2].to_pix(m_buf[wm-2]);
|
|
|
|
for(x = wm-3; x >= 0; --x)
|
|
{
|
|
m_sum2[x].calc(b, b1, b2, b3, m_sum1[x], m_sum2[x+1], m_sum2[x+2], m_sum2[x+3]);
|
|
m_sum2[x].to_pix(m_buf[x]);
|
|
}
|
|
img.copy_color_hspan(0, y, w, &m_buf[0]);
|
|
}
|
|
}
|
|
|
|
//--------------------------------------------------------------------
|
|
template<class Img> void blur_y(Img& img, double radius)
|
|
{
|
|
pixfmt_transposer<Img> img2(img);
|
|
blur_x(img2, radius);
|
|
}
|
|
|
|
//--------------------------------------------------------------------
|
|
template<class Img> void blur(Img& img, double radius)
|
|
{
|
|
blur_x(img, radius);
|
|
pixfmt_transposer<Img> img2(img);
|
|
blur_x(img2, radius);
|
|
}
|
|
|
|
private:
|
|
agg::pod_vector<calculator_type> m_sum1;
|
|
agg::pod_vector<calculator_type> m_sum2;
|
|
agg::pod_vector<color_type> m_buf;
|
|
};
|
|
|
|
|
|
//=================================================recursive_blur_calc_rgba
|
|
template<class T=double> struct recursive_blur_calc_rgba
|
|
{
|
|
typedef T value_type;
|
|
typedef recursive_blur_calc_rgba<T> self_type;
|
|
|
|
value_type r,g,b,a;
|
|
|
|
template<class ColorT>
|
|
AGG_INLINE void from_pix(const ColorT& c)
|
|
{
|
|
r = c.r;
|
|
g = c.g;
|
|
b = c.b;
|
|
a = c.a;
|
|
}
|
|
|
|
AGG_INLINE void calc(value_type b1,
|
|
value_type b2,
|
|
value_type b3,
|
|
value_type b4,
|
|
const self_type& c1,
|
|
const self_type& c2,
|
|
const self_type& c3,
|
|
const self_type& c4)
|
|
{
|
|
r = b1*c1.r + b2*c2.r + b3*c3.r + b4*c4.r;
|
|
g = b1*c1.g + b2*c2.g + b3*c3.g + b4*c4.g;
|
|
b = b1*c1.b + b2*c2.b + b3*c3.b + b4*c4.b;
|
|
a = b1*c1.a + b2*c2.a + b3*c3.a + b4*c4.a;
|
|
}
|
|
|
|
template<class ColorT>
|
|
AGG_INLINE void to_pix(ColorT& c) const
|
|
{
|
|
typedef typename ColorT::value_type cv_type;
|
|
c.r = cv_type(r);
|
|
c.g = cv_type(g);
|
|
c.b = cv_type(b);
|
|
c.a = cv_type(a);
|
|
}
|
|
};
|
|
|
|
|
|
//=================================================recursive_blur_calc_rgb
|
|
template<class T=double> struct recursive_blur_calc_rgb
|
|
{
|
|
typedef T value_type;
|
|
typedef recursive_blur_calc_rgb<T> self_type;
|
|
|
|
value_type r,g,b;
|
|
|
|
template<class ColorT>
|
|
AGG_INLINE void from_pix(const ColorT& c)
|
|
{
|
|
r = c.r;
|
|
g = c.g;
|
|
b = c.b;
|
|
}
|
|
|
|
AGG_INLINE void calc(value_type b1,
|
|
value_type b2,
|
|
value_type b3,
|
|
value_type b4,
|
|
const self_type& c1,
|
|
const self_type& c2,
|
|
const self_type& c3,
|
|
const self_type& c4)
|
|
{
|
|
r = b1*c1.r + b2*c2.r + b3*c3.r + b4*c4.r;
|
|
g = b1*c1.g + b2*c2.g + b3*c3.g + b4*c4.g;
|
|
b = b1*c1.b + b2*c2.b + b3*c3.b + b4*c4.b;
|
|
}
|
|
|
|
template<class ColorT>
|
|
AGG_INLINE void to_pix(ColorT& c) const
|
|
{
|
|
typedef typename ColorT::value_type cv_type;
|
|
c.r = cv_type(r);
|
|
c.g = cv_type(g);
|
|
c.b = cv_type(b);
|
|
}
|
|
};
|
|
|
|
|
|
//================================================recursive_blur_calc_gray
|
|
template<class T=double> struct recursive_blur_calc_gray
|
|
{
|
|
typedef T value_type;
|
|
typedef recursive_blur_calc_gray<T> self_type;
|
|
|
|
value_type v;
|
|
|
|
template<class ColorT>
|
|
AGG_INLINE void from_pix(const ColorT& c)
|
|
{
|
|
v = c.v;
|
|
}
|
|
|
|
AGG_INLINE void calc(value_type b1,
|
|
value_type b2,
|
|
value_type b3,
|
|
value_type b4,
|
|
const self_type& c1,
|
|
const self_type& c2,
|
|
const self_type& c3,
|
|
const self_type& c4)
|
|
{
|
|
v = b1*c1.v + b2*c2.v + b3*c3.v + b4*c4.v;
|
|
}
|
|
|
|
template<class ColorT>
|
|
AGG_INLINE void to_pix(ColorT& c) const
|
|
{
|
|
typedef typename ColorT::value_type cv_type;
|
|
c.v = cv_type(v);
|
|
}
|
|
};
|
|
|
|
//================================================slight_blur
|
|
// Special-purpose filter for applying a Gaussian blur with a radius small enough
|
|
// that the blur only affects adjacent pixels. A Gaussian curve with a standard
|
|
// deviation of r/2 is used, as per the HTML/CSS spec. At 3 standard deviations,
|
|
// the contribution drops to less than 0.005, i.e. less than half a percent,
|
|
// therefore the radius can be at least 1.33 before errors become significant.
|
|
// This filter is useful for smoothing artifacts caused by detail rendered
|
|
// at the pixel scale, e.g. single-pixel lines. Note that the filter should
|
|
// only be used with premultiplied pixel formats (or those without alpha).
|
|
// See the "line_thickness" example for a demonstration.
|
|
template<class PixFmt>
|
|
class slight_blur
|
|
{
|
|
public:
|
|
typedef typename PixFmt::pixel_type pixel_type;
|
|
typedef typename PixFmt::value_type value_type;
|
|
typedef typename PixFmt::order_type order_type;
|
|
|
|
slight_blur(double r = 1.33)
|
|
{
|
|
radius(r);
|
|
}
|
|
|
|
void radius(double r)
|
|
{
|
|
if (r > 0)
|
|
{
|
|
// Sample the gaussian curve at 0 and r/2 standard deviations.
|
|
// At 3 standard deviations, the response is < 0.005.
|
|
double pi = 3.14159;
|
|
double n = 2 / r;
|
|
m_g0 = 1 / std::sqrt(2 * pi);
|
|
m_g1 = m_g0 * exp(-n * n);
|
|
|
|
// Normalize.
|
|
double sum = m_g0 + 2 * m_g1;
|
|
m_g0 /= sum;
|
|
m_g1 /= sum;
|
|
}
|
|
else
|
|
{
|
|
m_g0 = 1;
|
|
m_g1 = 0;
|
|
}
|
|
}
|
|
|
|
void blur(PixFmt& img, rect_i bounds)
|
|
{
|
|
// Make sure we stay within the image area.
|
|
bounds.clip(rect_i(0, 0, img.width() - 1, img.height() - 1));
|
|
|
|
int w = bounds.x2 - bounds.x1 + 1;
|
|
int h = bounds.y2 - bounds.y1 + 1;
|
|
|
|
if (w < 3 || h < 3) return;
|
|
|
|
// Allocate 3 rows of buffer space.
|
|
m_buf.allocate(w * 3);
|
|
|
|
// Set up row pointers
|
|
pixel_type * begin = &m_buf[0];
|
|
pixel_type * r0 = begin;
|
|
pixel_type * r1 = r0 + w;
|
|
pixel_type * r2 = r1 + w;
|
|
pixel_type * end = r2 + w;
|
|
|
|
// Horizontally blur the first two input rows.
|
|
calc_row(img, bounds.x1, bounds.y1, w, r0);
|
|
std::memcpy(r1, r0, w * sizeof(pixel_type));
|
|
|
|
for (int y = 0; ; )
|
|
{
|
|
// Get pointer to first pixel.
|
|
pixel_type* p = img.pix_value_ptr(bounds.x1, bounds.y1 + y, bounds.x1 + w);
|
|
|
|
// Horizontally blur the row below.
|
|
if (y + 1 < h)
|
|
{
|
|
calc_row(img, bounds.x1, bounds.y1 + y + 1, w, r2);
|
|
}
|
|
else
|
|
{
|
|
std::memcpy(r2, r1, w * sizeof(pixel_type)); // duplicate bottom row
|
|
}
|
|
|
|
// Combine blurred rows into destination.
|
|
for (int x = 0; x < w; ++x)
|
|
{
|
|
calc_pixel(*r0++, *r1++, *r2++, *p++);
|
|
}
|
|
|
|
if (++y >= h) break;
|
|
|
|
// Wrap bottom row pointer around to top of buffer.
|
|
if (r2 == end) r2 = begin;
|
|
else if (r1 == end) r1 = begin;
|
|
else if (r0 == end) r0 = begin;
|
|
}
|
|
}
|
|
|
|
private:
|
|
void calc_row(PixFmt& img, int x, int y, int w, pixel_type* row)
|
|
{
|
|
const int wm = w - 1;
|
|
|
|
pixel_type* p = img.pix_value_ptr(x, y, w);
|
|
|
|
pixel_type c[3];
|
|
pixel_type* p0 = c;
|
|
pixel_type* p1 = c + 1;
|
|
pixel_type* p2 = c + 2;
|
|
pixel_type* end = c + 3;
|
|
*p0 = *p1 = *p;
|
|
|
|
for (int x = 0; x < wm; ++x)
|
|
{
|
|
*p2 = *(p = p->next());
|
|
|
|
calc_pixel(*p0++, *p1++, *p2++, *row++);
|
|
|
|
if (p0 == end) p0 = c;
|
|
else if (p1 == end) p1 = c;
|
|
else if (p2 == end) p2 = c;
|
|
}
|
|
|
|
calc_pixel(*p0, *p1, *p1, *row);
|
|
}
|
|
|
|
void calc_pixel(
|
|
pixel_type const & c1,
|
|
pixel_type const & c2,
|
|
pixel_type const & c3,
|
|
pixel_type & x)
|
|
{
|
|
calc_pixel(c1, c2, c3, x, PixFmt::pixfmt_category());
|
|
}
|
|
|
|
void calc_pixel(
|
|
pixel_type const & c1,
|
|
pixel_type const & c2,
|
|
pixel_type const & c3,
|
|
pixel_type & x,
|
|
pixfmt_gray_tag)
|
|
{
|
|
x.c[0] = calc_value(c1.c[0], c2.c[0], c3.c[0]);
|
|
}
|
|
|
|
void calc_pixel(
|
|
pixel_type const & c1,
|
|
pixel_type const & c2,
|
|
pixel_type const & c3,
|
|
pixel_type & x,
|
|
pixfmt_rgb_tag)
|
|
{
|
|
enum { R = order_type::R, G = order_type::G, B = order_type::B };
|
|
x.c[R] = calc_value(c1.c[R], c2.c[R], c3.c[R]);
|
|
x.c[G] = calc_value(c1.c[G], c2.c[G], c3.c[G]);
|
|
x.c[B] = calc_value(c1.c[B], c2.c[B], c3.c[B]);
|
|
}
|
|
|
|
void calc_pixel(
|
|
pixel_type const & c1,
|
|
pixel_type const & c2,
|
|
pixel_type const & c3,
|
|
pixel_type & x,
|
|
pixfmt_rgba_tag)
|
|
{
|
|
enum { R = order_type::R, G = order_type::G, B = order_type::B, A = order_type::A };
|
|
x.c[R] = calc_value(c1.c[R], c2.c[R], c3.c[R]);
|
|
x.c[G] = calc_value(c1.c[G], c2.c[G], c3.c[G]);
|
|
x.c[B] = calc_value(c1.c[B], c2.c[B], c3.c[B]);
|
|
x.c[A] = calc_value(c1.c[A], c2.c[A], c3.c[A]);
|
|
}
|
|
|
|
value_type calc_value(value_type v1, value_type v2, value_type v3)
|
|
{
|
|
return value_type(m_g1 * v1 + m_g0 * v2 + m_g1 * v3);
|
|
}
|
|
|
|
double m_g0, m_g1;
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pod_vector<pixel_type> m_buf;
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};
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// Helper functions for applying blur to a surface without having to create an intermediate object.
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template<class PixFmt>
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void apply_slight_blur(PixFmt& img, const rect_i& bounds, double r = 1)
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{
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if (r > 0) slight_blur<PixFmt>(r).blur(img, bounds);
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}
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template<class PixFmt>
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void apply_slight_blur(PixFmt& img, double r = 1)
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{
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if (r > 0) slight_blur<PixFmt>(r).blur(img, rect_i(0, 0, img.width() - 1, img.height() - 1));
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}
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template<class PixFmt>
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void apply_slight_blur(renderer_base<PixFmt>& img, const rect_i& bounds, double r = 1)
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{
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if (r > 0) slight_blur<PixFmt>(r).blur(img.ren(), bounds);
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}
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template<class PixFmt>
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void apply_slight_blur(renderer_base<PixFmt>& img, double r = 1)
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{
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if (r > 0) slight_blur<PixFmt>(r).blur(img.ren(), img.clip_box());
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}
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}
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#endif
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