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+//----------------------------------------------------------------------------
+// Anti-Grain Geometry - Version 2.4
+// 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 <string.h>
+#include "agg_pixfmt_base.h"
+#include "agg_rendering_buffer.h"
+
+namespace agg
+{
+
+ //============================================================blender_gray
+ 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;
+ typedef typename color_type::long_type long_type;
+
+ // Blend pixels using the non-premultiplied form of Alvy-Ray Smith's
+ // compositing function. Since the render buffer is opaque we skip the
+ // initial premultiply and final demultiply.
+
+ static AGG_INLINE void blend_pix(value_type* p,
+ value_type cv, value_type alpha, cover_type cover)
+ {
+ blend_pix(p, cv, color_type::mult_cover(alpha, cover));
+ }
+
+ static AGG_INLINE void blend_pix(value_type* p,
+ value_type cv, value_type alpha)
+ {
+ *p = color_type::lerp(*p, cv, alpha);
+ }
+ };
+
+
+ //======================================================blender_gray_pre
+ template<class ColorT> struct blender_gray_pre
+ {
+ typedef ColorT color_type;
+ typedef typename color_type::value_type value_type;
+ typedef typename color_type::calc_type calc_type;
+ typedef typename color_type::long_type long_type;
+
+ // Blend pixels using the premultiplied form of Alvy-Ray Smith's
+ // compositing function.
+
+ static AGG_INLINE void blend_pix(value_type* p,
+ value_type cv, value_type alpha, cover_type cover)
+ {
+ blend_pix(p, color_type::mult_cover(cv, cover), color_type::mult_cover(alpha, cover));
+ }
+
+ static AGG_INLINE void blend_pix(value_type* p,
+ value_type cv, value_type alpha)
+ {
+ *p = color_type::prelerp(*p, cv, alpha);
+ }
+ };
+
+
+
+ //=====================================================apply_gamma_dir_gray
+ template<class ColorT, class GammaLut> class apply_gamma_dir_gray
+ {
+ public:
+ typedef typename ColorT::value_type value_type;
+
+ apply_gamma_dir_gray(const GammaLut& gamma) : m_gamma(gamma) {}
+
+ AGG_INLINE void operator () (value_type* p)
+ {
+ *p = m_gamma.dir(*p);
+ }
+
+ private:
+ const GammaLut& m_gamma;
+ };
+
+
+
+ //=====================================================apply_gamma_inv_gray
+ template<class ColorT, class GammaLut> class apply_gamma_inv_gray
+ {
+ public:
+ typedef typename ColorT::value_type value_type;
+
+ apply_gamma_inv_gray(const GammaLut& gamma) : m_gamma(gamma) {}
+
+ AGG_INLINE void operator () (value_type* p)
+ {
+ *p = m_gamma.inv(*p);
+ }
+
+ private:
+ const GammaLut& m_gamma;
+ };
+
+
+
+ //=================================================pixfmt_alpha_blend_gray
+ template<class Blender, class RenBuf, unsigned Step = 1, unsigned Offset = 0>
+ class pixfmt_alpha_blend_gray
+ {
+ public:
+ typedef pixfmt_gray_tag pixfmt_category;
+ typedef RenBuf rbuf_type;
+ typedef typename rbuf_type::row_data row_data;
+ typedef Blender blender_type;
+ typedef typename blender_type::color_type color_type;
+ typedef int order_type; // A fake one
+ typedef typename color_type::value_type value_type;
+ typedef typename color_type::calc_type calc_type;
+ enum
+ {
+ num_components = 1,
+ pix_width = sizeof(value_type) * Step,
+ pix_step = Step,
+ pix_offset = Offset,
+ };
+ struct pixel_type
+ {
+ value_type c[num_components];
+
+ void set(value_type v)
+ {
+ c[0] = v;
+ }
+
+ void set(const color_type& color)
+ {
+ set(color.v);
+ }
+
+ void get(value_type& v) const
+ {
+ v = c[0];
+ }
+
+ color_type get() const
+ {
+ return color_type(c[0]);
+ }
+
+ pixel_type* next()
+ {
+ return (pixel_type*)(c + pix_step);
+ }
+
+ const pixel_type* next() const
+ {
+ return (const pixel_type*)(c + pix_step);
+ }
+
+ pixel_type* advance(int n)
+ {
+ return (pixel_type*)(c + n * pix_step);
+ }
+
+ const pixel_type* advance(int n) const
+ {
+ return (const pixel_type*)(c + n * pix_step);
+ }
+ };
+
+ private:
+ //--------------------------------------------------------------------
+ AGG_INLINE void blend_pix(pixel_type* p,
+ value_type v, value_type a,
+ unsigned cover)
+ {
+ blender_type::blend_pix(p->c, v, a, cover);
+ }
+
+ //--------------------------------------------------------------------
+ AGG_INLINE void blend_pix(pixel_type* p, value_type v, value_type a)
+ {
+ blender_type::blend_pix(p->c, v, a);
+ }
+
+ //--------------------------------------------------------------------
+ AGG_INLINE void blend_pix(pixel_type* p, const color_type& c, unsigned cover)
+ {
+ blender_type::blend_pix(p->c, c.v, c.a, cover);
+ }
+
+ //--------------------------------------------------------------------
+ AGG_INLINE void blend_pix(pixel_type* p, const color_type& c)
+ {
+ blender_type::blend_pix(p->c, c.v, c.a);
+ }
+
+ //--------------------------------------------------------------------
+ AGG_INLINE void copy_or_blend_pix(pixel_type* p, const color_type& c, unsigned cover)
+ {
+ if (!c.is_transparent())
+ {
+ if (c.is_opaque() && cover == cover_mask)
+ {
+ p->set(c);
+ }
+ else
+ {
+ blend_pix(p, c, cover);
+ }
+ }
+ }
+
+ //--------------------------------------------------------------------
+ AGG_INLINE void copy_or_blend_pix(pixel_type* p, const color_type& c)
+ {
+ if (!c.is_transparent())
+ {
+ if (c.is_opaque())
+ {
+ p->set(c);
+ }
+ else
+ {
+ blend_pix(p, c);
+ }
+ }
+ }
+
+ public:
+ //--------------------------------------------------------------------
+ explicit pixfmt_alpha_blend_gray(rbuf_type& rb) :
+ m_rbuf(&rb)
+ {}
+ void attach(rbuf_type& rb) { m_rbuf = &rb; }
+ //--------------------------------------------------------------------
+
+ template<class PixFmt>
+ bool attach(PixFmt& pixf, int x1, int y1, int x2, int y2)
+ {
+ rect_i r(x1, y1, x2, y2);
+ if (r.clip(rect_i(0, 0, pixf.width()-1, pixf.height()-1)))
+ {
+ int stride = pixf.stride();
+ m_rbuf->attach(pixf.pix_ptr(r.x1, stride < 0 ? r.y2 : r.y1),
+ (r.x2 - r.x1) + 1,
+ (r.y2 - r.y1) + 1,
+ stride);
+ return true;
+ }
+ return false;
+ }
+
+ //--------------------------------------------------------------------
+ AGG_INLINE unsigned width() const { return m_rbuf->width(); }
+ AGG_INLINE unsigned height() const { return m_rbuf->height(); }
+ AGG_INLINE int stride() const { return m_rbuf->stride(); }
+
+ //--------------------------------------------------------------------
+ int8u* row_ptr(int y) { return m_rbuf->row_ptr(y); }
+ const int8u* row_ptr(int y) const { return m_rbuf->row_ptr(y); }
+ row_data row(int y) const { return m_rbuf->row(y); }
+
+ //--------------------------------------------------------------------
+ AGG_INLINE int8u* pix_ptr(int x, int y)
+ {
+ return m_rbuf->row_ptr(y) + sizeof(value_type) * (x * pix_step + pix_offset);
+ }
+
+ AGG_INLINE const int8u* pix_ptr(int x, int y) const
+ {
+ return m_rbuf->row_ptr(y) + sizeof(value_type) * (x * pix_step + pix_offset);
+ }
+
+ // Return pointer to pixel value, forcing row to be allocated.
+ AGG_INLINE pixel_type* pix_value_ptr(int x, int y, unsigned len)
+ {
+ return (pixel_type*)(m_rbuf->row_ptr(x, y, len) + sizeof(value_type) * (x * pix_step + pix_offset));
+ }
+
+ // Return pointer to pixel value, or null if row not allocated.
+ AGG_INLINE const pixel_type* pix_value_ptr(int x, int y) const
+ {
+ int8u* p = m_rbuf->row_ptr(y);
+ return p ? (pixel_type*)(p + sizeof(value_type) * (x * pix_step + pix_offset)) : 0;
+ }
+
+ // Get pixel pointer from raw buffer pointer.
+ AGG_INLINE static pixel_type* pix_value_ptr(void* p)
+ {
+ return (pixel_type*)((value_type*)p + pix_offset);
+ }
+
+ // Get pixel pointer from raw buffer pointer.
+ AGG_INLINE static const pixel_type* pix_value_ptr(const void* p)
+ {
+ return (const pixel_type*)((const value_type*)p + pix_offset);
+ }
+
+ //--------------------------------------------------------------------
+ AGG_INLINE static void write_plain_color(void* p, color_type c)
+ {
+ // Grayscale formats are implicitly premultiplied.
+ c.premultiply();
+ pix_value_ptr(p)->set(c);
+ }
+
+ //--------------------------------------------------------------------
+ AGG_INLINE static color_type read_plain_color(const void* p)
+ {
+ return pix_value_ptr(p)->get();
+ }
+
+ //--------------------------------------------------------------------
+ AGG_INLINE static void make_pix(int8u* p, const color_type& c)
+ {
+ ((pixel_type*)p)->set(c);
+ }
+
+ //--------------------------------------------------------------------
+ AGG_INLINE color_type pixel(int x, int y) const
+ {
+ if (const pixel_type* p = pix_value_ptr(x, y))
+ {
+ return p->get();
+ }
+ return color_type::no_color();
+ }
+
+ //--------------------------------------------------------------------
+ AGG_INLINE void copy_pixel(int x, int y, const color_type& c)
+ {
+ pix_value_ptr(x, y, 1)->set(c);
+ }
+
+ //--------------------------------------------------------------------
+ AGG_INLINE void blend_pixel(int x, int y, const color_type& c, int8u cover)
+ {
+ copy_or_blend_pix(pix_value_ptr(x, y, 1), c, cover);
+ }
+
+ //--------------------------------------------------------------------
+ AGG_INLINE void copy_hline(int x, int y,
+ unsigned len,
+ const color_type& c)
+ {
+ pixel_type* p = pix_value_ptr(x, y, len);
+ do
+ {
+ p->set(c);
+ p = p->next();
+ }
+ while(--len);
+ }
+
+
+ //--------------------------------------------------------------------
+ AGG_INLINE void copy_vline(int x, int y,
+ unsigned len,
+ const color_type& c)
+ {
+ do
+ {
+ pix_value_ptr(x, y++, 1)->set(c);
+ }
+ while (--len);
+ }
+
+
+ //--------------------------------------------------------------------
+ void blend_hline(int x, int y,
+ unsigned len,
+ const color_type& c,
+ int8u cover)
+ {
+ if (!c.is_transparent())
+ {
+ pixel_type* p = pix_value_ptr(x, y, len);
+
+ if (c.is_opaque() && cover == cover_mask)
+ {
+ do
+ {
+ p->set(c);
+ p = p->next();
+ }
+ while (--len);
+ }
+ else
+ {
+ do
+ {
+ blend_pix(p, c, cover);
+ p = p->next();
+ }
+ while (--len);
+ }
+ }
+ }
+
+
+ //--------------------------------------------------------------------
+ void blend_vline(int x, int y,
+ unsigned len,
+ const color_type& c,
+ int8u cover)
+ {
+ if (!c.is_transparent())
+ {
+ if (c.is_opaque() && cover == cover_mask)
+ {
+ do
+ {
+ pix_value_ptr(x, y++, 1)->set(c);
+ }
+ while (--len);
+ }
+ else
+ {
+ do
+ {
+ blend_pix(pix_value_ptr(x, y++, 1), c, cover);
+ }
+ while (--len);
+ }
+ }
+ }
+
+
+ //--------------------------------------------------------------------
+ void blend_solid_hspan(int x, int y,
+ unsigned len,
+ const color_type& c,
+ const int8u* covers)
+ {
+ if (!c.is_transparent())
+ {
+ pixel_type* p = pix_value_ptr(x, y, len);
+
+ do
+ {
+ if (c.is_opaque() && *covers == cover_mask)
+ {
+ p->set(c);
+ }
+ else
+ {
+ blend_pix(p, c, *covers);
+ }
+ p = p->next();
+ ++covers;
+ }
+ while (--len);
+ }
+ }
+
+
+ //--------------------------------------------------------------------
+ void blend_solid_vspan(int x, int y,
+ unsigned len,
+ const color_type& c,
+ const int8u* covers)
+ {
+ if (!c.is_transparent())
+ {
+ do
+ {
+ pixel_type* p = pix_value_ptr(x, y++, 1);
+
+ if (c.is_opaque() && *covers == cover_mask)
+ {
+ p->set(c);
+ }
+ else
+ {
+ blend_pix(p, c, *covers);
+ }
+ ++covers;
+ }
+ while (--len);
+ }
+ }
+
+
+ //--------------------------------------------------------------------
+ void copy_color_hspan(int x, int y,
+ unsigned len,
+ const color_type* colors)
+ {
+ pixel_type* p = pix_value_ptr(x, y, len);
+
+ do
+ {
+ p->set(*colors++);
+ p = p->next();
+ }
+ while (--len);
+ }
+
+
+ //--------------------------------------------------------------------
+ void copy_color_vspan(int x, int y,
+ unsigned len,
+ const color_type* colors)
+ {
+ do
+ {
+ pix_value_ptr(x, y++, 1)->set(*colors++);
+ }
+ while (--len);
+ }
+
+
+ //--------------------------------------------------------------------
+ void blend_color_hspan(int x, int y,
+ unsigned len,
+ const color_type* colors,
+ const int8u* covers,
+ int8u cover)
+ {
+ pixel_type* p = pix_value_ptr(x, y, len);
+
+ if (covers)
+ {
+ do
+ {
+ copy_or_blend_pix(p, *colors++, *covers++);
+ p = p->next();
+ }
+ while (--len);
+ }
+ else
+ {
+ if (cover == cover_mask)
+ {
+ do
+ {
+ copy_or_blend_pix(p, *colors++);
+ p = p->next();
+ }
+ while (--len);
+ }
+ else
+ {
+ do
+ {
+ copy_or_blend_pix(p, *colors++, cover);
+ p = p->next();
+ }
+ while (--len);
+ }
+ }
+ }
+
+
+ //--------------------------------------------------------------------
+ void blend_color_vspan(int x, int y,
+ unsigned len,
+ const color_type* colors,
+ const int8u* covers,
+ int8u cover)
+ {
+ if (covers)
+ {
+ do
+ {
+ copy_or_blend_pix(pix_value_ptr(x, y++, 1), *colors++, *covers++);
+ }
+ while (--len);
+ }
+ else
+ {
+ if (cover == cover_mask)
+ {
+ do
+ {
+ copy_or_blend_pix(pix_value_ptr(x, y++, 1), *colors++);
+ }
+ while (--len);
+ }
+ else
+ {
+ do
+ {
+ copy_or_blend_pix(pix_value_ptr(x, y++, 1), *colors++, cover);
+ }
+ while (--len);
+ }
+ }
+ }
+
+ //--------------------------------------------------------------------
+ template<class Function> void for_each_pixel(Function f)
+ {
+ unsigned y;
+ for (y = 0; y < height(); ++y)
+ {
+ row_data r = m_rbuf->row(y);
+ if (r.ptr)
+ {
+ unsigned len = r.x2 - r.x1 + 1;
+ pixel_type* p = pix_value_ptr(r.x1, y, len);
+ do
+ {
+ f(p->c);
+ p = p->next();
+ }
+ while (--len);
+ }
+ }
+ }
+
+ //--------------------------------------------------------------------
+ template<class GammaLut> void apply_gamma_dir(const GammaLut& g)
+ {
+ for_each_pixel(apply_gamma_dir_gray<color_type, GammaLut>(g));
+ }
+
+ //--------------------------------------------------------------------
+ template<class GammaLut> void apply_gamma_inv(const GammaLut& g)
+ {
+ for_each_pixel(apply_gamma_inv_gray<color_type, GammaLut>(g));
+ }
+
+ //--------------------------------------------------------------------
+ template<class RenBuf2>
+ void copy_from(const RenBuf2& from,
+ int xdst, int ydst,
+ int xsrc, int ysrc,
+ unsigned len)
+ {
+ if (const int8u* p = from.row_ptr(ysrc))
+ {
+ memmove(m_rbuf->row_ptr(xdst, ydst, len) + xdst * pix_width,
+ p + xsrc * pix_width,
+ len * pix_width);
+ }
+ }
+
+ //--------------------------------------------------------------------
+ // Blend from single color, using grayscale surface as alpha channel.
+ template<class SrcPixelFormatRenderer>
+ void blend_from_color(const SrcPixelFormatRenderer& from,
+ const color_type& color,
+ int xdst, int ydst,
+ int xsrc, int ysrc,
+ unsigned len,
+ int8u cover)
+ {
+ typedef typename SrcPixelFormatRenderer::pixel_type src_pixel_type;
+ typedef typename SrcPixelFormatRenderer::color_type src_color_type;
+
+ if (const src_pixel_type* psrc = from.pix_value_ptr(xsrc, ysrc))
+ {
+ pixel_type* pdst = pix_value_ptr(xdst, ydst, len);
+
+ do
+ {
+ copy_or_blend_pix(pdst, color, src_color_type::scale_cover(cover, psrc->c[0]));
+ psrc = psrc->next();
+ pdst = pdst->next();
+ }
+ while (--len);
+ }
+ }
+
+ //--------------------------------------------------------------------
+ // Blend from color table, using grayscale surface as indexes into table.
+ // Obviously, this only works for integer value types.
+ template<class SrcPixelFormatRenderer>
+ void blend_from_lut(const SrcPixelFormatRenderer& from,
+ const color_type* color_lut,
+ int xdst, int ydst,
+ int xsrc, int ysrc,
+ unsigned len,
+ int8u cover)
+ {
+ typedef typename SrcPixelFormatRenderer::pixel_type src_pixel_type;
+
+ if (const src_pixel_type* psrc = from.pix_value_ptr(xsrc, ysrc))
+ {
+ pixel_type* pdst = pix_value_ptr(xdst, ydst, len);
+
+ do
+ {
+ copy_or_blend_pix(pdst, color_lut[psrc->c[0]], cover);
+ psrc = psrc->next();
+ pdst = pdst->next();
+ }
+ while (--len);
+ }
+ }
+
+ private:
+ rbuf_type* m_rbuf;
+ };
+
+ typedef blender_gray<gray8> blender_gray8;
+ typedef blender_gray<sgray8> blender_sgray8;
+ typedef blender_gray<gray16> blender_gray16;
+ typedef blender_gray<gray32> blender_gray32;
+
+ typedef blender_gray_pre<gray8> blender_gray8_pre;
+ typedef blender_gray_pre<sgray8> blender_sgray8_pre;
+ typedef blender_gray_pre<gray16> blender_gray16_pre;
+ typedef blender_gray_pre<gray32> blender_gray32_pre;
+
+ typedef pixfmt_alpha_blend_gray<blender_gray8, rendering_buffer> pixfmt_gray8;
+ typedef pixfmt_alpha_blend_gray<blender_sgray8, rendering_buffer> pixfmt_sgray8;
+ typedef pixfmt_alpha_blend_gray<blender_gray16, rendering_buffer> pixfmt_gray16;
+ typedef pixfmt_alpha_blend_gray<blender_gray32, rendering_buffer> pixfmt_gray32;
+
+ typedef pixfmt_alpha_blend_gray<blender_gray8_pre, rendering_buffer> pixfmt_gray8_pre;
+ typedef pixfmt_alpha_blend_gray<blender_sgray8_pre, rendering_buffer> pixfmt_sgray8_pre;
+ typedef pixfmt_alpha_blend_gray<blender_gray16_pre, rendering_buffer> pixfmt_gray16_pre;
+ typedef pixfmt_alpha_blend_gray<blender_gray32_pre, rendering_buffer> pixfmt_gray32_pre;
+}
+
+#endif
+
generated by cgit v1.2.3 (git 2.25.1) at 2024-07-10 13:57:57 +0300