39241fe228
git-svn-id: file:///srv/svn/repos/haiku/trunk/current@9933 a95241bf-73f2-0310-859d-f6bbb57e9c96
327 lines
12 KiB
C++
327 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_RGB565_INCLUDED
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#define AGG_PIXFMT_RGB565_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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#include "agg_rendering_buffer.h"
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namespace agg
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{
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//------------------------------------------------------------------rgb565
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inline int16u rgb565(unsigned r, unsigned g, unsigned b)
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{
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return (int16u)(((r & 0xF8) << 8) | ((g & 0xFC) << 3) | (b >> 3));
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}
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//===========================================================pixfmt_rgb565
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class pixfmt_rgb565
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{
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public:
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typedef rgba8 color_type;
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//--------------------------------------------------------------------
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pixfmt_rgb565(rendering_buffer& rb)
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: m_rbuf(&rb)
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{
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}
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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)
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{
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unsigned rgb = ((int16u*)(m_rbuf->row(y)))[x];
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return color_type((rgb >> 8) & 0xF8,
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(rgb >> 3) & 0xFC,
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(rgb << 3) & 0xF8);
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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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((int16u*)(m_rbuf->row(y)))[x] = rgb565(c.r, c.g, c.b);
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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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int alpha = int(cover) * c.a;
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int16u* p = (int16u*)(m_rbuf->row(y)) + x;
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if(alpha == 255*255)
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{
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*p = rgb565(c.r, c.g, c.b);
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}
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else
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{
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int16u rgb = *p;
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int r = (rgb >> 8) & 0xF8;
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int g = (rgb >> 3) & 0xFC;
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int b = (rgb << 3) & 0xF8;
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*p = (int16u)
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((((((c.r - r) * alpha) + (r << 16)) >> 8) & 0xF800) |
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(((((c.g - g) * alpha) + (g << 16)) >> 13) & 0x7E0) |
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((((c.b - b) * alpha) + (b << 16)) >> 19));
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}
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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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int16u* p = (int16u*)(m_rbuf->row(y)) + x;
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int16u v = rgb565(c.r, c.g, c.b);
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do
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{
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*p++ = 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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int8u* p = m_rbuf->row(y) + (x << 1);
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int16u v = rgb565(c.r, c.g, c.b);
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do
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{
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*(int16u*)p = v;
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p += m_rbuf->stride();
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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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int16u* p = (int16u*)(m_rbuf->row(y)) + x;
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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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int16u v = rgb565(c.r, c.g, c.b);
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do
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{
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*p++ = 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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do
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{
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int16u rgb = *p;
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int r = (rgb >> 8) & 0xF8;
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int g = (rgb >> 3) & 0xFC;
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int b = (rgb << 3) & 0xF8;
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*p++ = (int16u)
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((((((c.r - r) * alpha) + (r << 16)) >> 8) & 0xF800) |
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(((((c.g - g) * alpha) + (g << 16)) >> 13) & 0x7E0) |
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((((c.b - b) * alpha) + (b << 16)) >> 19));
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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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int8u* p = m_rbuf->row(y) + (x << 1);
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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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int16u v = rgb565(c.r, c.g, c.b);
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do
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{
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*(int16u*)p = v;
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p += m_rbuf->stride();
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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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do
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{
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int16u rgb = *(int16u*)p;
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int r = (rgb >> 8) & 0xF8;
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int g = (rgb >> 3) & 0xFC;
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int b = (rgb << 3) & 0xF8;
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*(int16u*)p = (int16u)
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((((((c.r - r) * alpha) + (r << 16)) >> 8) & 0xF800) |
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(((((c.g - g) * alpha) + (g << 16)) >> 13) & 0x7E0) |
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((((c.b - b) * alpha) + (b << 16)) >> 19));
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p += m_rbuf->stride();
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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 copy_from(const rendering_buffer& 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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memmove(m_rbuf->row(ydst) + xdst * 2,
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(const void*)(from.row(ysrc) + xsrc * 2), len * 2);
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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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int16u* p = (int16u*)(m_rbuf->row(y)) + x;
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do
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{
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int alpha = int(*covers++) * c.a;
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if(alpha)
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{
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if(alpha == 255*255)
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{
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*p = rgb565(c.r, c.g, c.b);
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}
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else
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{
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int16u rgb = *p;
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int r = (rgb >> 8) & 0xF8;
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int g = (rgb >> 3) & 0xFC;
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int b = (rgb << 3) & 0xF8;
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*p = (int16u)
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((((((c.r - r) * alpha) + (r << 16)) >> 8) & 0xF800) |
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(((((c.g - g) * alpha) + (g << 16)) >> 13) & 0x7E0) |
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((((c.b - b) * alpha) + (b << 16)) >> 19));
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}
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}
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++p;
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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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int8u* p = m_rbuf->row(y) + (x << 1);
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do
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{
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int alpha = int(*covers++) * c.a;
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if(alpha)
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{
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if(alpha == 255*255)
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{
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*(int16u*)p = rgb565(c.r, c.g, c.b);
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}
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else
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{
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int16u rgb = *(int16u*)p;
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int r = (rgb >> 8) & 0xF8;
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int g = (rgb >> 3) & 0xFC;
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int b = (rgb << 3) & 0xF8;
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*(int16u*)p = (int16u)
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((((((c.r - r) * alpha) + (r << 16)) >> 8) & 0xF800) |
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(((((c.g - g) * alpha) + (g << 16)) >> 13) & 0x7E0) |
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((((c.b - b) * alpha) + (b << 16)) >> 19));
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}
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}
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p += m_rbuf->stride();
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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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int16u* p = (int16u*)(m_rbuf->row(y)) + x;
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do
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{
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int alpha = colors->a * (covers ? int(*covers++) : int(cover));
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if(alpha)
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{
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if(alpha == 255*255)
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{
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*(int16u*)p = rgb565(colors->r, colors->g, colors->b);
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}
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else
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{
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int16u rgb = *p;
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int r = (rgb >> 8) & 0xF8;
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int g = (rgb >> 3) & 0xFC;
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int b = (rgb << 3) & 0xF8;
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*p = (int16u)
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((((((colors->r - r) * alpha) + (r << 16)) >> 8) & 0xF800) |
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(((((colors->g - g) * alpha) + (g << 16)) >> 13) & 0x7E0) |
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((((colors->b - b) * alpha) + (b << 16)) >> 19));
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}
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}
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++p;
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++colors;
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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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int8u* p = m_rbuf->row(y) + (x << 1);
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do
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{
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int alpha = colors->a * (covers ? int(*covers++) : int(cover));
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if(alpha)
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{
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if(alpha == 255*255)
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{
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*(int16u*)p = rgb565(colors->r, colors->g, colors->b);
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}
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else
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{
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int16u rgb = *(int16u*)p;
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int r = (rgb >> 8) & 0xF8;
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int g = (rgb >> 3) & 0xFC;
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int b = (rgb << 3) & 0xF8;
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*(int16u*)p = (int16u)
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((((((colors->r - r) * alpha) + (r << 16)) >> 8) & 0xF800) |
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(((((colors->g - g) * alpha) + (g << 16)) >> 13) & 0x7E0) |
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((((colors->b - b) * alpha) + (b << 16)) >> 19));
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}
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}
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p += m_rbuf->stride();
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++colors;
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}
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while(--len);
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}
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private:
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rendering_buffer* m_rbuf;
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};
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}
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#endif
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