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Diffstat (limited to 'agg/inc/agg_span_image_resample_gray.h')
-rwxr-xr-x | agg/inc/agg_span_image_resample_gray.h | 359 |
1 files changed, 359 insertions, 0 deletions
diff --git a/agg/inc/agg_span_image_resample_gray.h b/agg/inc/agg_span_image_resample_gray.h new file mode 100755 index 000000000000..3d046462cd8c --- /dev/null +++ b/agg/inc/agg_span_image_resample_gray.h @@ -0,0 +1,359 @@ +//---------------------------------------------------------------------------- +// Anti-Grain Geometry - Version 2.3 +// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com) +// +// Permission to copy, use, modify, sell and distribute this software +// is granted provided this copyright notice appears in all copies. +// This software is provided "as is" without express or implied +// warranty, and with no claim as to its suitability for any purpose. +// +//---------------------------------------------------------------------------- +// Contact: mcseem@antigrain.com +// mcseemagg@yahoo.com +// http://www.antigrain.com +//---------------------------------------------------------------------------- + +#ifndef AGG_SPAN_IMAGE_RESAMPLE_GRAY_INCLUDED +#define AGG_SPAN_IMAGE_RESAMPLE_GRAY_INCLUDED + +#include "agg_color_gray.h" +#include "agg_span_image_resample.h" + +namespace agg +{ + + //========================================span_image_resample_gray_affine + template<class ColorT, + class Allocator = span_allocator<ColorT> > + class span_image_resample_gray_affine : + public span_image_resample_affine<ColorT, Allocator> + { + public: + typedef ColorT color_type; + typedef Allocator alloc_type; + typedef span_image_resample_affine<color_type, alloc_type> base_type; + typedef typename base_type::interpolator_type interpolator_type; + typedef typename color_type::value_type value_type; + typedef typename color_type::long_type long_type; + enum + { + base_shift = color_type::base_shift, + base_mask = color_type::base_mask, + downscale_shift = image_filter_shift + }; + + //-------------------------------------------------------------------- + span_image_resample_gray_affine(alloc_type& alloc) : base_type(alloc) {} + + //-------------------------------------------------------------------- + span_image_resample_gray_affine(alloc_type& alloc, + const rendering_buffer& src, + const color_type& back_color, + interpolator_type& inter, + const image_filter_lut& filter) : + base_type(alloc, src, back_color, inter, filter) + {} + + + //-------------------------------------------------------------------- + color_type* generate(int x, int y, unsigned len) + { + base_type::interpolator().begin(x + base_type::filter_dx_dbl(), + y + base_type::filter_dy_dbl(), len); + + long_type fg; + long_type src_alpha; + value_type back_v = base_type::background_color().v; + value_type back_a = base_type::background_color().a; + + color_type* span = base_type::allocator().span(); + + int diameter = base_type::filter().diameter(); + int filter_size = diameter << image_subpixel_shift; + int radius_x = (diameter * base_type::m_rx) >> 1; + int radius_y = (diameter * base_type::m_ry) >> 1; + int maxx = base_type::source_image().width() - 1; + int maxy = base_type::source_image().height() - 1; + + const int16* weight_array = base_type::filter().weight_array(); + + do + { + base_type::interpolator().coordinates(&x, &y); + + x += base_type::filter_dx_int() - radius_x; + y += base_type::filter_dy_int() - radius_y; + + fg = src_alpha = image_filter_size / 2; + + int y_lr = y >> image_subpixel_shift; + int y_hr = ((image_subpixel_mask - (y & image_subpixel_mask)) * + base_type::m_ry_inv) >> + image_subpixel_shift; + int total_weight = 0; + int x_lr_ini = x >> image_subpixel_shift; + int x_hr_ini = ((image_subpixel_mask - (x & image_subpixel_mask)) * + base_type::m_rx_inv) >> + image_subpixel_shift; + do + { + int weight_y = weight_array[y_hr]; + int x_lr = x_lr_ini; + int x_hr = x_hr_ini; + if(y_lr >= 0 && y_lr <= maxy) + { + const value_type* fg_ptr = (const value_type*) + base_type::source_image().row(y_lr) + x_lr; + do + { + int weight = (weight_y * weight_array[x_hr] + + image_filter_size / 2) >> + downscale_shift; + + if(x_lr >= 0 && x_lr <= maxx) + { + fg += *fg_ptr * weight; + src_alpha += base_mask * weight; + } + else + { + fg += back_v * weight; + src_alpha += back_a * weight; + } + total_weight += weight; + x_hr += base_type::m_rx_inv; + ++fg_ptr; + ++x_lr; + } + while(x_hr < filter_size); + } + else + { + do + { + int weight = (weight_y * weight_array[x_hr] + + image_filter_size / 2) >> + downscale_shift; + + total_weight += weight; + fg += back_v * weight; + src_alpha += back_a * weight; + x_hr += base_type::m_rx_inv; + } + while(x_hr < filter_size); + } + y_hr += base_type::m_ry_inv; + ++y_lr; + } + while(y_hr < filter_size); + + fg /= total_weight; + src_alpha /= total_weight; + + if(fg < 0) fg = 0; + if(src_alpha < 0) src_alpha = 0; + + if(src_alpha > base_mask) src_alpha = base_mask; + if(fg > src_alpha) fg = src_alpha; + + span->v = (value_type)fg; + span->a = (value_type)src_alpha; + + ++span; + ++base_type::interpolator(); + } while(--len); + return base_type::allocator().span(); + } + }; + + + + + + + + //==============================================span_image_resample_gray + template<class ColorT, + class Interpolator, + class Allocator = span_allocator<ColorT> > + class span_image_resample_gray : + public span_image_resample<ColorT, Interpolator, Allocator> + { + public: + typedef ColorT color_type; + typedef Interpolator interpolator_type; + typedef Allocator alloc_type; + typedef span_image_resample<color_type, interpolator_type, alloc_type> base_type; + typedef typename color_type::value_type value_type; + typedef typename color_type::long_type long_type; + enum + { + base_shift = color_type::base_shift, + base_mask = color_type::base_mask, + downscale_shift = image_filter_shift + }; + + //-------------------------------------------------------------------- + span_image_resample_gray(alloc_type& alloc) : + base_type(alloc) + {} + + //-------------------------------------------------------------------- + span_image_resample_gray(alloc_type& alloc, + const rendering_buffer& src, + const color_type& back_color, + interpolator_type& inter, + const image_filter_lut& filter) : + base_type(alloc, src, back_color, inter, filter) + {} + + //-------------------------------------------------------------------- + color_type* generate(int x, int y, unsigned len) + { + color_type* span = base_type::allocator().span(); + base_type::interpolator().begin(x + base_type::filter_dx_dbl(), + y + base_type::filter_dy_dbl(), len); + long_type fg; + long_type src_alpha; + value_type back_v = base_type::background_color().v; + value_type back_a = base_type::background_color().a; + + int diameter = base_type::filter().diameter(); + int filter_size = diameter << image_subpixel_shift; + + const int16* weight_array = base_type::filter().weight_array(); + + do + { + int rx; + int ry; + int rx_inv = image_subpixel_size; + int ry_inv = image_subpixel_size; + base_type::interpolator().coordinates(&x, &y); + base_type::interpolator().local_scale(&rx, &ry); + + rx = (rx * base_type::m_blur_x) >> image_subpixel_shift; + ry = (ry * base_type::m_blur_y) >> image_subpixel_shift; + + if(rx < image_subpixel_size) + { + rx = image_subpixel_size; + } + else + { + if(rx > image_subpixel_size * base_type::m_scale_limit) + { + rx = image_subpixel_size * base_type::m_scale_limit; + } + rx_inv = image_subpixel_size * image_subpixel_size / rx; + } + + if(ry < image_subpixel_size) + { + ry = image_subpixel_size; + } + else + { + if(ry > image_subpixel_size * base_type::m_scale_limit) + { + ry = image_subpixel_size * base_type::m_scale_limit; + } + ry_inv = image_subpixel_size * image_subpixel_size / ry; + } + + int radius_x = (diameter * rx) >> 1; + int radius_y = (diameter * ry) >> 1; + int maxx = base_type::source_image().width() - 1; + int maxy = base_type::source_image().height() - 1; + + x += base_type::filter_dx_int() - radius_x; + y += base_type::filter_dy_int() - radius_y; + + fg = src_alpha = image_filter_size / 2; + + int y_lr = y >> image_subpixel_shift; + int y_hr = ((image_subpixel_mask - (y & image_subpixel_mask)) * + ry_inv) >> + image_subpixel_shift; + int total_weight = 0; + int x_lr_ini = x >> image_subpixel_shift; + int x_hr_ini = ((image_subpixel_mask - (x & image_subpixel_mask)) * + rx_inv) >> + image_subpixel_shift; + + do + { + int weight_y = weight_array[y_hr]; + int x_lr = x_lr_ini; + int x_hr = x_hr_ini; + if(y_lr >= 0 && y_lr <= maxy) + { + const value_type* fg_ptr = (const value_type*) + base_type::source_image().row(y_lr) + x_lr; + do + { + int weight = (weight_y * weight_array[x_hr] + + image_filter_size / 2) >> + downscale_shift; + + if(x_lr >= 0 && x_lr <= maxx) + { + fg += *fg_ptr * weight; + src_alpha += base_mask * weight; + } + else + { + fg += back_v * weight; + src_alpha += back_a * weight; + } + total_weight += weight; + x_hr += rx_inv; + ++fg_ptr; + ++x_lr; + } + while(x_hr < filter_size); + } + else + { + do + { + int weight = (weight_y * weight_array[x_hr] + + image_filter_size / 2) >> + downscale_shift; + + total_weight += weight; + fg += back_v * weight; + src_alpha += back_a * weight; + x_hr += rx_inv; + } + while(x_hr < filter_size); + } + y_hr += ry_inv; + ++y_lr; + } + while(y_hr < filter_size); + + fg /= total_weight; + src_alpha /= total_weight; + + if(fg < 0) fg = 0; + if(src_alpha < 0) src_alpha = 0; + + if(src_alpha > base_mask) src_alpha = base_mask; + if(fg > src_alpha) fg = src_alpha; + + span->v = (value_type)fg; + span->a = (value_type)src_alpha; + + ++span; + ++base_type::interpolator(); + } while(--len); + return base_type::allocator().span(); + } + + }; + +} + + +#endif |