//---------------------------------------------------------------------------- // Anti-Grain Geometry (AGG) - Version 2.5 // A high quality rendering engine for C++ // Copyright (C) 2002-2006 Maxim Shemanarev // Contact: mcseem@antigrain.com // mcseemagg@yahoo.com // http://antigrain.com // // AGG 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. // // AGG 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. // // You should have received a copy of the GNU General Public License // along with AGG; if not, write to the Free Software // Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, // MA 02110-1301, USA. //---------------------------------------------------------------------------- // // The Stack Blur Algorithm was invented by Mario Klingemann, // mario@quasimondo.com and described here: // http://incubator.quasimondo.com/processing/fast_blur_deluxe.php // (search phrase "Stackblur: Fast But Goodlooking"). // The major improvement is that there's no more division table // that was very expensive to create for large blur radii. Insted, // for 8-bit per channel and radius not exceeding 254 the division is // replaced by multiplication and shift. // //---------------------------------------------------------------------------- #ifndef AGG_BLUR_INCLUDED #define AGG_BLUR_INCLUDED #include "agg_array.h" #include "agg_pixfmt_transposer.h" namespace agg { template<class T> struct stack_blur_tables { static int16u const g_stack_blur8_mul[255]; static int8u const g_stack_blur8_shr[255]; }; //------------------------------------------------------------------------ template<class T> int16u const stack_blur_tables<T>::g_stack_blur8_mul[255] = { 512,512,456,512,328,456,335,512,405,328,271,456,388,335,292,512, 454,405,364,328,298,271,496,456,420,388,360,335,312,292,273,512, 482,454,428,405,383,364,345,328,312,298,284,271,259,496,475,456, 437,420,404,388,374,360,347,335,323,312,302,292,282,273,265,512, 497,482,468,454,441,428,417,405,394,383,373,364,354,345,337,328, 320,312,305,298,291,284,278,271,265,259,507,496,485,475,465,456, 446,437,428,420,412,404,396,388,381,374,367,360,354,347,341,335, 329,323,318,312,307,302,297,292,287,282,278,273,269,265,261,512, 505,497,489,482,475,468,461,454,447,441,435,428,422,417,411,405, 399,394,389,383,378,373,368,364,359,354,350,345,341,337,332,328, 324,320,316,312,309,305,301,298,294,291,287,284,281,278,274,271, 268,265,262,259,257,507,501,496,491,485,480,475,470,465,460,456, 451,446,442,437,433,428,424,420,416,412,408,404,400,396,392,388, 385,381,377,374,370,367,363,360,357,354,350,347,344,341,338,335, 332,329,326,323,320,318,315,312,310,307,304,302,299,297,294,292, 289,287,285,282,280,278,275,273,271,269,267,265,263,261,259 }; //------------------------------------------------------------------------ template<class T> int8u const stack_blur_tables<T>::g_stack_blur8_shr[255] = { 9, 11, 12, 13, 13, 14, 14, 15, 15, 15, 15, 16, 16, 16, 16, 17, 17, 17, 17, 17, 17, 17, 18, 18, 18, 18, 18, 18, 18, 18, 18, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24 }; //==============================================================stack_blur template<class ColorT, class CalculatorT> class stack_blur { public: typedef ColorT color_type; typedef CalculatorT calculator_type; //-------------------------------------------------------------------- template<class Img> void blur_x(Img& img, unsigned radius) { if(radius < 1) return; unsigned x, y, xp, i; unsigned stack_ptr; unsigned stack_start; color_type pix; color_type* stack_pix; calculator_type sum; calculator_type sum_in; calculator_type sum_out; unsigned w = img.width(); unsigned h = img.height(); unsigned wm = w - 1; unsigned div = radius * 2 + 1; unsigned div_sum = (radius + 1) * (radius + 1); unsigned mul_sum = 0; unsigned shr_sum = 0; unsigned max_val = color_type::base_mask; if(max_val <= 255 && radius < 255) { mul_sum = stack_blur_tables<int>::g_stack_blur8_mul[radius]; shr_sum = stack_blur_tables<int>::g_stack_blur8_shr[radius]; } m_buf.allocate(w, 128); m_stack.allocate(div, 32); for(y = 0; y < h; y++) { sum.clear(); sum_in.clear(); sum_out.clear(); pix = img.pixel(0, y); for(i = 0; i <= radius; i++) { m_stack[i] = pix; sum.add(pix, i + 1); sum_out.add(pix); } for(i = 1; i <= radius; i++) { pix = img.pixel((i > wm) ? wm : i, y); m_stack[i + radius] = pix; sum.add(pix, radius + 1 - i); sum_in.add(pix); } stack_ptr = radius; for(x = 0; x < w; x++) { if(mul_sum) sum.calc_pix(m_buf[x], mul_sum, shr_sum); else sum.calc_pix(m_buf[x], div_sum); sum.sub(sum_out); stack_start = stack_ptr + div - radius; if(stack_start >= div) stack_start -= div; stack_pix = &m_stack[stack_start]; sum_out.sub(*stack_pix); xp = x + radius + 1; if(xp > wm) xp = wm; pix = img.pixel(xp, y); *stack_pix = pix; sum_in.add(pix); sum.add(sum_in); ++stack_ptr; if(stack_ptr >= div) stack_ptr = 0; stack_pix = &m_stack[stack_ptr]; sum_out.add(*stack_pix); sum_in.sub(*stack_pix); } img.copy_color_hspan(0, y, w, &m_buf[0]); } } //-------------------------------------------------------------------- template<class Img> void blur_y(Img& img, unsigned radius) { pixfmt_transposer<Img> img2(img); blur_x(img2, radius); } //-------------------------------------------------------------------- template<class Img> void blur(Img& img, unsigned radius) { blur_x(img, radius); pixfmt_transposer<Img> img2(img); blur_x(img2, radius); } private: pod_vector<color_type> m_buf; pod_vector<color_type> m_stack; }; //====================================================stack_blur_calc_rgba template<class T=unsigned> struct stack_blur_calc_rgba { typedef T value_type; value_type r,g,b,a; AGG_INLINE void clear() { r = g = b = a = 0; } template<class ArgT> AGG_INLINE void add(const ArgT& v) { r += v.r; g += v.g; b += v.b; a += v.a; } template<class ArgT> AGG_INLINE void add(const ArgT& v, unsigned k) { r += v.r * k; g += v.g * k; b += v.b * k; a += v.a * k; } template<class ArgT> AGG_INLINE void sub(const ArgT& v) { r -= v.r; g -= v.g; b -= v.b; a -= v.a; } template<class ArgT> AGG_INLINE void calc_pix(ArgT& v, unsigned div) { typedef typename ArgT::value_type value_type; v.r = value_type(r / div); v.g = value_type(g / div); v.b = value_type(b / div); v.a = value_type(a / div); } template<class ArgT> AGG_INLINE void calc_pix(ArgT& v, unsigned mul, unsigned shr) { typedef typename ArgT::value_type value_type; v.r = value_type((r * mul) >> shr); v.g = value_type((g * mul) >> shr); v.b = value_type((b * mul) >> shr); v.a = value_type((a * mul) >> shr); } }; //=====================================================stack_blur_calc_rgb template<class T=unsigned> struct stack_blur_calc_rgb { typedef T value_type; value_type r,g,b; AGG_INLINE void clear() { r = g = b = 0; } template<class ArgT> AGG_INLINE void add(const ArgT& v) { r += v.r; g += v.g; b += v.b; } template<class ArgT> AGG_INLINE void add(const ArgT& v, unsigned k) { r += v.r * k; g += v.g * k; b += v.b * k; } template<class ArgT> AGG_INLINE void sub(const ArgT& v) { r -= v.r; g -= v.g; b -= v.b; } template<class ArgT> AGG_INLINE void calc_pix(ArgT& v, unsigned div) { typedef typename ArgT::value_type value_type; v.r = value_type(r / div); v.g = value_type(g / div); v.b = value_type(b / div); } template<class ArgT> AGG_INLINE void calc_pix(ArgT& v, unsigned mul, unsigned shr) { typedef typename ArgT::value_type value_type; v.r = value_type((r * mul) >> shr); v.g = value_type((g * mul) >> shr); v.b = value_type((b * mul) >> shr); } }; //====================================================stack_blur_calc_gray template<class T=unsigned> struct stack_blur_calc_gray { typedef T value_type; value_type v; AGG_INLINE void clear() { v = 0; } template<class ArgT> AGG_INLINE void add(const ArgT& a) { v += a.v; } template<class ArgT> AGG_INLINE void add(const ArgT& a, unsigned k) { v += a.v * k; } template<class ArgT> AGG_INLINE void sub(const ArgT& a) { v -= a.v; } template<class ArgT> AGG_INLINE void calc_pix(ArgT& a, unsigned div) { typedef typename ArgT::value_type value_type; a.v = value_type(v / div); } template<class ArgT> AGG_INLINE void calc_pix(ArgT& a, unsigned mul, unsigned shr) { typedef typename ArgT::value_type value_type; a.v = value_type((v * mul) >> shr); } }; //========================================================stack_blur_gray8 template<class Img> void stack_blur_gray8(Img& img, unsigned rx, unsigned ry) { unsigned x, y, xp, yp, i; unsigned stack_ptr; unsigned stack_start; const int8u* src_pix_ptr; int8u* dst_pix_ptr; unsigned pix; unsigned stack_pix; unsigned sum; unsigned sum_in; unsigned sum_out; 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<int8u> 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 = sum_in = sum_out = 0; src_pix_ptr = img.pix_ptr(0, y); pix = *src_pix_ptr; for(i = 0; i <= rx; i++) { stack[i] = pix; sum += pix * (i + 1); sum_out += pix; } for(i = 1; i <= rx; i++) { if(i <= wm) src_pix_ptr += Img::pix_step; pix = *src_pix_ptr; stack[i + rx] = pix; sum += pix * (rx + 1 - i); sum_in += pix; } 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 = (sum * mul_sum) >> shr_sum; dst_pix_ptr += Img::pix_step; sum -= sum_out; stack_start = stack_ptr + div - rx; if(stack_start >= div) stack_start -= div; sum_out -= stack[stack_start]; if(xp < wm) { src_pix_ptr += Img::pix_step; pix = *src_pix_ptr; ++xp; } stack[stack_start] = pix; sum_in += pix; sum += sum_in; ++stack_ptr; if(stack_ptr >= div) stack_ptr = 0; stack_pix = stack[stack_ptr]; sum_out += stack_pix; sum_in -= stack_pix; } } } 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 = sum_in = sum_out = 0; src_pix_ptr = img.pix_ptr(x, 0); pix = *src_pix_ptr; for(i = 0; i <= ry; i++) { stack[i] = pix; sum += pix * (i + 1); sum_out += pix; } for(i = 1; i <= ry; i++) { if(i <= hm) src_pix_ptr += stride; pix = *src_pix_ptr; stack[i + ry] = pix; sum += pix * (ry + 1 - i); sum_in += pix; } 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 = (sum * mul_sum) >> shr_sum; dst_pix_ptr += stride; sum -= sum_out; stack_start = stack_ptr + div - ry; if(stack_start >= div) stack_start -= div; sum_out -= stack[stack_start]; if(yp < hm) { src_pix_ptr += stride; pix = *src_pix_ptr; ++yp; } stack[stack_start] = pix; sum_in += pix; sum += sum_in; ++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 |