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Diffstat (limited to 'third_party/agg23/agg_pixfmt_gray.h')
| -rw-r--r-- | third_party/agg23/agg_pixfmt_gray.h | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/third_party/agg23/agg_pixfmt_gray.h b/third_party/agg23/agg_pixfmt_gray.h new file mode 100644 index 0000000000..5a80935479 --- /dev/null +++ b/third_party/agg23/agg_pixfmt_gray.h @@ -0,0 +1,177 @@ + +//---------------------------------------------------------------------------- +// 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 +//---------------------------------------------------------------------------- +// +// Adaptation for high precision colors has been sponsored by +// Liberty Technology Systems, Inc., visit http://lib-sys.com +// +// Liberty Technology Systems, Inc. is the provider of +// PostScript and PDF technology for software developers. +// +//---------------------------------------------------------------------------- +#ifndef AGG_PIXFMT_GRAY_INCLUDED +#define AGG_PIXFMT_GRAY_INCLUDED +#include "agg_basics.h" +#include "agg_color_gray.h" +#include "agg_rendering_buffer.h" +namespace agg +{ +template<class ColorT> struct blender_gray { + typedef ColorT color_type; + typedef typename color_type::value_type value_type; + typedef typename color_type::calc_type calc_type; + enum base_scale_e { base_shift = color_type::base_shift }; + static AGG_INLINE void blend_pix(value_type* p, unsigned cv, + unsigned alpha, unsigned cover = 0) + { + *p = (value_type)((((cv - calc_type(*p)) * alpha) + (calc_type(*p) << base_shift)) >> base_shift); + } +}; +template<class Blender, unsigned Step = 1, unsigned Offset = 0> +class pixel_formats_gray +{ +public: + typedef rendering_buffer::row_data row_data; + typedef rendering_buffer::span_data span_data; + typedef typename Blender::color_type color_type; + typedef typename color_type::value_type value_type; + typedef typename color_type::calc_type calc_type; + enum base_scale_e { + base_shift = color_type::base_shift, + base_size = color_type::base_size, + base_mask = color_type::base_mask + }; +private: + static AGG_INLINE void copy_or_blend_pix(value_type* p, + const color_type& c, + unsigned cover) + { + if (c.a) { + calc_type alpha = (calc_type(c.a) * (cover + 1)) >> 8; + if(alpha == base_mask) { + *p = c.v; + } else { + Blender::blend_pix(p, c.v, alpha, cover); + } + } + } + static AGG_INLINE void copy_or_blend_pix(value_type* p, + const color_type& c) + { + if (c.a) { + if(c.a == base_mask) { + *p = c.v; + } else { + Blender::blend_pix(p, c.v, c.a); + } + } + } +public: + pixel_formats_gray(rendering_buffer& rb) : + m_rbuf(&rb) + {} + AGG_INLINE unsigned width() const + { + return m_rbuf->width(); + } + AGG_INLINE unsigned height() const + { + return m_rbuf->height(); + } + AGG_INLINE color_type pixel(int x, int y) const + { + value_type* p = (value_type*)m_rbuf->row(y) + x * Step + Offset; + return color_type(*p); + } + row_data row(int x, int y) const + { + return row_data(x, + width() - 1, + m_rbuf->row(y) + + x * Step * sizeof(value_type) + + Offset * sizeof(value_type)); + } + span_data span(int x, int y, unsigned len) + { + return span_data(x, len, + m_rbuf->row(y) + + x * Step * sizeof(value_type) + + Offset * sizeof(value_type)); + } + AGG_INLINE void copy_pixel(int x, int y, const color_type& c) + { + *((value_type*)m_rbuf->row(y) + x * Step + Offset) = c.v; + } + AGG_INLINE void blend_pixel(int x, int y, const color_type& c, int8u cover) + { + copy_or_blend_pix((value_type*)m_rbuf->row(y) + x * Step + Offset, c, cover); + } + AGG_INLINE void copy_hline(int x, int y, + unsigned len, + const color_type& c) + { + value_type* p = (value_type*)m_rbuf->row(y) + x * Step + Offset; + do { + *p = c.v; + p += Step; + } while(--len); + } + void blend_hline(int x, int y, + unsigned len, + const color_type& c, + int8u cover) + { + if (c.a) { + value_type* p = (value_type*)m_rbuf->row(y) + x * Step + Offset; + calc_type alpha = (calc_type(c.a) * (cover + 1)) >> 8; + if(alpha == base_mask) { + do { + *p = c.v; + p += Step; + } while(--len); + } else { + do { + Blender::blend_pix(p, c.v, alpha, cover); + p += Step; + } while(--len); + } + } + } + void blend_solid_hspan(int x, int y, + unsigned len, + const color_type& c, + const int8u* covers) + { + if (c.a) { + value_type* p = (value_type*)m_rbuf->row(y) + x * Step + Offset; + do { + calc_type alpha = (calc_type(c.a) * (calc_type(*covers) + 1)) >> 8; + if(alpha == base_mask) { + *p = c.v; + } else { + Blender::blend_pix(p, c.v, alpha, *covers); + } + p += Step; + ++covers; + } while(--len); + } + } +private: + rendering_buffer* m_rbuf; +}; +typedef blender_gray<gray8> blender_gray8; +typedef pixel_formats_gray<blender_gray8, 1, 0> pixfmt_gray8; +} +#endif |