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394 lines
16 KiB
C++
394 lines
16 KiB
C++
//----------------------------------------------------------------------------
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// Anti-Grain Geometry - Version 2.3
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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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#ifndef AGG_SPAN_IMAGE_RESAMPLE_RGBA_INCLUDED
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#define AGG_SPAN_IMAGE_RESAMPLE_RGBA_INCLUDED
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#include "agg_color_rgba.h"
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#include "agg_span_image_resample.h"
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namespace agg
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{
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//========================================span_image_resample_rgba_affine
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template<class ColorT,
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class Order,
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class Allocator = span_allocator<ColorT> >
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class span_image_resample_rgba_affine :
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public span_image_resample_affine<ColorT, Allocator>
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{
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public:
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typedef ColorT color_type;
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typedef Order order_type;
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typedef Allocator alloc_type;
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typedef span_image_resample_affine<color_type, alloc_type> base_type;
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typedef typename base_type::interpolator_type interpolator_type;
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typedef typename color_type::value_type value_type;
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typedef typename color_type::long_type long_type;
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enum base_scale_e
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{
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base_shift = color_type::base_shift,
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base_mask = color_type::base_mask,
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downscale_shift = image_filter_shift
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};
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//--------------------------------------------------------------------
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span_image_resample_rgba_affine(alloc_type& alloc) : base_type(alloc) {}
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//--------------------------------------------------------------------
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span_image_resample_rgba_affine(alloc_type& alloc,
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const rendering_buffer& src,
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const color_type& back_color,
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interpolator_type& inter,
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const image_filter_lut& filter) :
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base_type(alloc, src, back_color, inter, filter)
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{}
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//--------------------------------------------------------------------
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color_type* generate(int x, int y, unsigned len)
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{
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base_type::interpolator().begin(x + base_type::filter_dx_dbl(),
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y + base_type::filter_dy_dbl(), len);
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long_type fg[4];
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value_type back_r = base_type::background_color().r;
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value_type back_g = base_type::background_color().g;
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value_type back_b = base_type::background_color().b;
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value_type back_a = base_type::background_color().a;
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color_type* span = base_type::allocator().span();
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int diameter = base_type::filter().diameter();
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int filter_size = diameter << image_subpixel_shift;
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int radius_x = (diameter * base_type::m_rx) >> 1;
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int radius_y = (diameter * base_type::m_ry) >> 1;
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int maxx = base_type::source_image().width() - 1;
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int maxy = base_type::source_image().height() - 1;
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const int16* weight_array = base_type::filter().weight_array();
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do
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{
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base_type::interpolator().coordinates(&x, &y);
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x += base_type::filter_dx_int() - radius_x;
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y += base_type::filter_dy_int() - radius_y;
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fg[0] = fg[1] = fg[2] = fg[3] = image_filter_size / 2;
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int y_lr = y >> image_subpixel_shift;
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int y_hr = ((image_subpixel_mask - (y & image_subpixel_mask)) *
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base_type::m_ry_inv) >>
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image_subpixel_shift;
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int total_weight = 0;
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int x_lr_ini = x >> image_subpixel_shift;
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int x_hr_ini = ((image_subpixel_mask - (x & image_subpixel_mask)) *
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base_type::m_rx_inv) >>
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image_subpixel_shift;
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do
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{
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int weight_y = weight_array[y_hr];
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int x_lr = x_lr_ini;
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int x_hr = x_hr_ini;
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if(y_lr >= 0 && y_lr <= maxy)
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{
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const value_type* fg_ptr = (const value_type*)
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base_type::source_image().row(y_lr) + (x_lr << 2);
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do
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{
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int weight = (weight_y * weight_array[x_hr] +
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image_filter_size / 2) >>
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downscale_shift;
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if(x_lr >= 0 && x_lr <= maxx)
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{
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fg[0] += fg_ptr[0] * weight;
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fg[1] += fg_ptr[1] * weight;
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fg[2] += fg_ptr[2] * weight;
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fg[3] += fg_ptr[3] * weight;
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}
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else
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{
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fg[order_type::R] += back_r * weight;
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fg[order_type::G] += back_g * weight;
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fg[order_type::B] += back_b * weight;
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fg[order_type::A] += back_a * weight;
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}
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total_weight += weight;
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fg_ptr += 4;
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x_hr += base_type::m_rx_inv;
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++x_lr;
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}
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while(x_hr < filter_size);
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}
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else
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{
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do
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{
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int weight = (weight_y * weight_array[x_hr] +
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image_filter_size / 2) >>
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downscale_shift;
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total_weight += weight;
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fg[order_type::R] += back_r * weight;
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fg[order_type::G] += back_g * weight;
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fg[order_type::B] += back_b * weight;
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fg[order_type::A] += back_a * weight;
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x_hr += base_type::m_rx_inv;
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}
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while(x_hr < filter_size);
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}
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y_hr += base_type::m_ry_inv;
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++y_lr;
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}
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while(y_hr < filter_size);
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fg[0] /= total_weight;
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fg[1] /= total_weight;
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fg[2] /= total_weight;
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fg[3] /= total_weight;
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if(fg[0] < 0) fg[0] = 0;
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if(fg[1] < 0) fg[1] = 0;
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if(fg[2] < 0) fg[2] = 0;
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if(fg[3] < 0) fg[3] = 0;
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if(fg[order_type::A] > base_mask) fg[order_type::A] = base_mask;
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if(fg[order_type::R] > fg[order_type::A]) fg[order_type::R] = fg[order_type::A];
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if(fg[order_type::G] > fg[order_type::A]) fg[order_type::G] = fg[order_type::A];
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if(fg[order_type::B] > fg[order_type::A]) fg[order_type::B] = fg[order_type::A];
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span->r = (value_type)fg[order_type::R];
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span->g = (value_type)fg[order_type::G];
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span->b = (value_type)fg[order_type::B];
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span->a = (value_type)fg[order_type::A];
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++span;
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++base_type::interpolator();
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} while(--len);
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return base_type::allocator().span();
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}
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};
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//==============================================span_image_resample_rgba
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template<class ColorT,
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class Order,
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class Interpolator,
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class Allocator = span_allocator<ColorT> >
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class span_image_resample_rgba :
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public span_image_resample<ColorT, Interpolator, Allocator>
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{
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public:
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typedef ColorT color_type;
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typedef Order order_type;
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typedef Interpolator interpolator_type;
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typedef Allocator alloc_type;
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typedef span_image_resample<color_type, interpolator_type, alloc_type> base_type;
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typedef typename color_type::value_type value_type;
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typedef typename color_type::long_type long_type;
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enum base_scale_e
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{
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base_shift = color_type::base_shift,
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base_mask = color_type::base_mask,
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downscale_shift = image_filter_shift
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};
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//--------------------------------------------------------------------
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span_image_resample_rgba(alloc_type& alloc) :
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base_type(alloc)
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{}
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//--------------------------------------------------------------------
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span_image_resample_rgba(alloc_type& alloc,
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const rendering_buffer& src,
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const color_type& back_color,
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interpolator_type& inter,
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const image_filter_lut& filter) :
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base_type(alloc, src, back_color, inter, filter)
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{}
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//--------------------------------------------------------------------
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color_type* generate(int x, int y, unsigned len)
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{
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color_type* span = base_type::allocator().span();
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base_type::interpolator().begin(x + base_type::filter_dx_dbl(),
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y + base_type::filter_dy_dbl(), len);
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long_type fg[4];
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value_type back_r = base_type::background_color().r;
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value_type back_g = base_type::background_color().g;
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value_type back_b = base_type::background_color().b;
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value_type back_a = base_type::background_color().a;
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int diameter = base_type::filter().diameter();
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int filter_size = diameter << image_subpixel_shift;
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const int16* weight_array = base_type::filter().weight_array();
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do
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{
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int rx;
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int ry;
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int rx_inv = image_subpixel_size;
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int ry_inv = image_subpixel_size;
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base_type::interpolator().coordinates(&x, &y);
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base_type::interpolator().local_scale(&rx, &ry);
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rx = (rx * base_type::m_blur_x) >> image_subpixel_shift;
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ry = (ry * base_type::m_blur_y) >> image_subpixel_shift;
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if(rx < image_subpixel_size)
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{
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rx = image_subpixel_size;
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}
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else
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{
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if(rx > image_subpixel_size * base_type::m_scale_limit)
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{
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rx = image_subpixel_size * base_type::m_scale_limit;
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}
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rx_inv = image_subpixel_size * image_subpixel_size / rx;
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}
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if(ry < image_subpixel_size)
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{
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ry = image_subpixel_size;
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}
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else
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{
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if(ry > image_subpixel_size * base_type::m_scale_limit)
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{
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ry = image_subpixel_size * base_type::m_scale_limit;
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}
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ry_inv = image_subpixel_size * image_subpixel_size / ry;
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}
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int radius_x = (diameter * rx) >> 1;
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int radius_y = (diameter * ry) >> 1;
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int maxx = base_type::source_image().width() - 1;
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int maxy = base_type::source_image().height() - 1;
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x += base_type::filter_dx_int() - radius_x;
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y += base_type::filter_dy_int() - radius_y;
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fg[0] = fg[1] = fg[2] = fg[3] = image_filter_size / 2;
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int y_lr = y >> image_subpixel_shift;
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int y_hr = ((image_subpixel_mask - (y & image_subpixel_mask)) *
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ry_inv) >>
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image_subpixel_shift;
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int total_weight = 0;
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int x_lr_ini = x >> image_subpixel_shift;
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int x_hr_ini = ((image_subpixel_mask - (x & image_subpixel_mask)) *
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rx_inv) >>
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image_subpixel_shift;
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do
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{
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int weight_y = weight_array[y_hr];
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int x_lr = x_lr_ini;
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int x_hr = x_hr_ini;
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if(y_lr >= 0 && y_lr <= maxy)
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{
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const value_type* fg_ptr = (const value_type*)
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base_type::source_image().row(y_lr) + (x_lr << 2);
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do
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{
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int weight = (weight_y * weight_array[x_hr] +
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image_filter_size / 2) >>
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downscale_shift;
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if(x_lr >= 0 && x_lr <= maxx)
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{
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fg[0] += fg_ptr[0] * weight;
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fg[1] += fg_ptr[1] * weight;
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fg[2] += fg_ptr[2] * weight;
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fg[3] += fg_ptr[3] * weight;
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}
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else
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{
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fg[order_type::R] += back_r * weight;
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fg[order_type::G] += back_g * weight;
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fg[order_type::B] += back_b * weight;
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fg[order_type::A] += back_a * weight;
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}
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total_weight += weight;
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fg_ptr += 4;
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x_hr += rx_inv;
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++x_lr;
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}
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while(x_hr < filter_size);
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}
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else
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{
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do
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{
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int weight = (weight_y * weight_array[x_hr] +
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image_filter_size / 2) >>
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downscale_shift;
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total_weight += weight;
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fg[order_type::R] += back_r * weight;
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fg[order_type::G] += back_g * weight;
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fg[order_type::B] += back_b * weight;
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fg[order_type::A] += back_a * weight;
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x_hr += rx_inv;
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}
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while(x_hr < filter_size);
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}
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y_hr += ry_inv;
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++y_lr;
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}
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while(y_hr < filter_size);
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fg[0] /= total_weight;
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fg[1] /= total_weight;
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fg[2] /= total_weight;
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fg[3] /= total_weight;
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if(fg[0] < 0) fg[0] = 0;
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if(fg[1] < 0) fg[1] = 0;
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if(fg[2] < 0) fg[2] = 0;
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if(fg[3] < 0) fg[3] = 0;
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if(fg[order_type::A] > base_mask) fg[order_type::A] = base_mask;
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if(fg[order_type::R] > fg[order_type::R]) fg[order_type::R] = fg[order_type::R];
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if(fg[order_type::G] > fg[order_type::G]) fg[order_type::G] = fg[order_type::G];
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if(fg[order_type::B] > fg[order_type::B]) fg[order_type::B] = fg[order_type::B];
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span->r = (value_type)fg[order_type::R];
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span->g = (value_type)fg[order_type::G];
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span->b = (value_type)fg[order_type::B];
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span->a = (value_type)fg[order_type::A];
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++span;
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++base_type::interpolator();
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} while(--len);
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return base_type::allocator().span();
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}
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};
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}
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#endif
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