346 lines
12 KiB
C++
346 lines
12 KiB
C++
//----------------------------------------------------------------------------
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// Anti-Grain Geometry - Version 2.2
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// Copyright (C) 2002-2004 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_PIXFMT_CRB_RGBA32_PRE_INCLUDED
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#define AGG_PIXFMT_CRB_RGBA32_PRE_INCLUDED
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#include <string.h>
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#include "agg_basics.h"
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#include "agg_color_rgba8.h"
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namespace agg
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{
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//============================================pixel_formats_crb_rgba32_pre
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template<class RenBuf, class Order> class pixel_formats_crb_rgba32_pre
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{
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public:
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typedef rgba8 color_type;
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typedef RenBuf buffer_type;
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typedef Order order_type;
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typedef typename RenBuf::row_data row_data;
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private:
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//--------------------------------------------------------------------
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static inline void copy_pix(int8u* p, const color_type& c)
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{
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p[Order::R] = (int8u)c.r;
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p[Order::G] = (int8u)c.g;
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p[Order::B] = (int8u)c.b;
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p[Order::A] = (int8u)c.a;
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}
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//--------------------------------------------------------------------
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static inline void blend_pix(int8u* p, const color_type& c,
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unsigned cover, unsigned alpha)
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{
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p[Order::R] = (int8u)((p[Order::R] * alpha + ((c.r * cover) << 8)) >> 16);
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p[Order::G] = (int8u)((p[Order::G] * alpha + ((c.g * cover) << 8)) >> 16);
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p[Order::B] = (int8u)((p[Order::B] * alpha + ((c.b * cover) << 8)) >> 16);
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p[Order::A] = (int8u)(255 - ((alpha * (255 - p[Order::A])) >> 16));
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}
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//--------------------------------------------------------------------
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static inline void copy_or_blend_pix(int8u* p, const color_type& c, unsigned cover)
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{
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unsigned alpha = 65535 - cover * c.a;
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if(alpha < 65535)
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{
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if(alpha <= 65535-255*255)
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{
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copy_pix(p, c);
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}
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else
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{
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blend_pix(p, c, cover, alpha);
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}
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}
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}
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//--------------------------------------------------------------------
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static inline void copy_or_blend_pix(int8u* p, const color_type& c)
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{
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unsigned alpha = 255 - c.a;
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if(alpha < 255)
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{
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if(alpha == 0)
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{
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copy_pix(p, c);
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}
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else
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{
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p[Order::R] = (int8u)((p[Order::R] * alpha + (c.r << 8)) >> 8);
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p[Order::G] = (int8u)((p[Order::G] * alpha + (c.g << 8)) >> 8);
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p[Order::B] = (int8u)((p[Order::B] * alpha + (c.b << 8)) >> 8);
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p[Order::A] = (int8u)(255 - ((alpha * (255 - p[Order::A])) >> 8));
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}
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}
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}
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public:
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//--------------------------------------------------------------------
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pixel_formats_crb_rgba32_pre(RenBuf& rb) : m_rbuf(&rb) {}
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//--------------------------------------------------------------------
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unsigned width() const { return m_rbuf->width(); }
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unsigned height() const { return m_rbuf->height(); }
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//--------------------------------------------------------------------
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color_type pixel(int x, int y) const
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{
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const int8u* p = m_rbuf->span_ptr(x, y, 1);
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return p ? color_type(p[Order::R], p[Order::G], p[Order::B], p[Order::A]) :
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color_type::no_color();
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}
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//--------------------------------------------------------------------
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row_data span(int x, int y) const
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{
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return m_rbuf->span(x, y);
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}
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//--------------------------------------------------------------------
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void copy_pixel(int x, int y, const color_type& c)
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{
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int8u* p = m_rbuf->span_ptr(x, y, 1);
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p[Order::R] = (int8u)c.r;
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p[Order::G] = (int8u)c.g;
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p[Order::B] = (int8u)c.b;
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p[Order::A] = (int8u)c.a;
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}
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//--------------------------------------------------------------------
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void blend_pixel(int x, int y, const color_type& c, int8u cover)
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{
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copy_or_blend_pix(m_rbuf->span_ptr(x, y, 1), c, cover);
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}
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//--------------------------------------------------------------------
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void copy_hline(int x, int y, unsigned len, const color_type& c)
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{
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int32u v;
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copy_pix((int8u*)&v, c);
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int32u* p32 = (int32u*)(m_rbuf->span_ptr(x, y, len));
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do
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{
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*p32++ = v;
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}
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while(--len);
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}
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//--------------------------------------------------------------------
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void copy_vline(int x, int y, unsigned len, const color_type& c)
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{
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int32u v;
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copy_pix((int8u*)&v, c);
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do
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{
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*(int32u*)(m_rbuf->span_ptr(x, y, 1)) = v;
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++y;
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}
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while(--len);
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}
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//--------------------------------------------------------------------
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void blend_hline(int x, int y, unsigned len,
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const color_type& c, int8u cover)
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{
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int alpha = int(cover) * int(c.a);
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if(alpha == 255*255)
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{
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int32u v;
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copy_pix((int8u*)&v, c);
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int32u* p32 = (int32u*)(m_rbuf->span_ptr(x, y, len));
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do
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{
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*p32++ = v;
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}
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while(--len);
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}
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else
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{
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int8u* p = m_rbuf->span_ptr(x, y, len);
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alpha = 65535 - alpha;
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do
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{
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blend_pix(p, c, cover, alpha);
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p += 4;
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}
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while(--len);
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}
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}
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//--------------------------------------------------------------------
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void blend_vline(int x, int y, unsigned len,
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const color_type& c, int8u cover)
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{
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int alpha = int(cover) * c.a;
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if(alpha == 255*255)
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{
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int32u v;
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copy_pix((int8u*)&v, c);
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do
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{
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*(int32u*)(m_rbuf->span_ptr(x, y, 1)) = v;
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++y;
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}
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while(--len);
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}
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else
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{
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alpha = 65535 - alpha;
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do
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{
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blend_pix(m_rbuf->span_ptr(x, y, 1), c, cover, alpha);
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++y;
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}
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while(--len);
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}
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}
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//--------------------------------------------------------------------
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template<class RenBuf2> void copy_from(const RenBuf2& from,
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int xdst, int ydst,
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int xsrc, int ysrc,
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unsigned len)
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{
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const int8u* p = from.row(ysrc);
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if(p)
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{
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p += xsrc << 2;
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memmove(m_rbuf->span_ptr(xdst, ydst, len), p, len * 4);
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}
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}
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//--------------------------------------------------------------------
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template<class SrcPixelFormatRenderer>
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void blend_from(const SrcPixelFormatRenderer& from,
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const int8u* psrc,
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int xdst, int ydst,
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int xsrc, int ysrc,
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unsigned len)
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{
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typedef typename SrcPixelFormatRenderer::order_type src_order;
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int8u* pdst = m_rbuf->span_ptr(xdst, ydst, len);
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int incp = 4;
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if(xdst > xsrc)
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{
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psrc += (len-1) << 2;
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pdst += (len-1) << 2;
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incp = -4;
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}
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do
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{
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unsigned alpha = 255 - psrc[src_order::A];
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if(alpha < 255)
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{
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if(alpha == 0)
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{
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pdst[Order::R] = psrc[src_order::R];
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pdst[Order::G] = psrc[src_order::G];
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pdst[Order::B] = psrc[src_order::B];
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pdst[Order::A] = psrc[src_order::A];
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}
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else
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{
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pdst[Order::R] = (int8u)((pdst[Order::R] * alpha + (psrc[src_order::R] << 8)) >> 8);
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pdst[Order::G] = (int8u)((pdst[Order::G] * alpha + (psrc[src_order::G] << 8)) >> 8);
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pdst[Order::B] = (int8u)((pdst[Order::B] * alpha + (psrc[src_order::B] << 8)) >> 8);
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pdst[Order::A] = (int8u)(255 - ((alpha * (255 - pdst[Order::A])) >> 8));
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}
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}
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psrc += incp;
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pdst += incp;
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}
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while(--len);
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}
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//--------------------------------------------------------------------
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void blend_solid_hspan(int x, int y, unsigned len,
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const color_type& c, const int8u* covers)
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{
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int8u* p = m_rbuf->span_ptr(x, y, len);
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do
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{
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copy_or_blend_pix(p, c, *covers++);
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p += 4;
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}
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while(--len);
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}
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//--------------------------------------------------------------------
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void blend_solid_vspan(int x, int y, unsigned len,
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const color_type& c, const int8u* covers)
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{
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do
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{
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copy_or_blend_pix(m_rbuf->span_ptr(x, y, 1), c, *covers++);
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++y;
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}
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while(--len);
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}
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//--------------------------------------------------------------------
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void blend_color_hspan(int x, int y, unsigned len,
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const color_type* colors,
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const int8u* covers,
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int8u cover)
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{
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int8u* p = m_rbuf->span_ptr(x, y, len);
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do
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{
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copy_or_blend_pix(p, *colors++, covers ? *covers++ : cover);
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p += 4;
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}
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while(--len);
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}
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//--------------------------------------------------------------------
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void blend_color_vspan(int x, int y, unsigned len,
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const color_type* colors,
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const int8u* covers,
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int8u cover)
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{
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do
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{
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copy_or_blend_pix(m_rbuf->span_ptr(x, y, 1),
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*colors++,
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covers ? *covers++ : cover);
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++y;
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}
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while(--len);
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}
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private:
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RenBuf* m_rbuf;
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};
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}
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#endif
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