239 lines
7.9 KiB
C++
239 lines
7.9 KiB
C++
//----------------------------------------------------------------------------
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// Anti-Grain Geometry (AGG) - Version 2.5
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// A high quality rendering engine for C++
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// Copyright (C) 2002-2006 Maxim Shemanarev
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// Contact: mcseem@antigrain.com
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// mcseemagg@yahoo.com
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// http://antigrain.com
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//
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// AGG is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License
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// as published by the Free Software Foundation; either version 2
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// of the License, or (at your option) any later version.
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//
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// AGG is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with AGG; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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// MA 02110-1301, USA.
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//----------------------------------------------------------------------------
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#ifndef AGG_PIXFMT_RGB24_LCD_INCLUDED
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#define AGG_PIXFMT_RGB24_LCD_INCLUDED
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#include <string.h>
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#include "agg_basics.h"
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#include "agg_color_rgba.h"
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#include "agg_rendering_buffer.h"
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namespace agg
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{
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//=====================================================lcd_distribution_lut
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class lcd_distribution_lut
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{
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public:
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lcd_distribution_lut(double prim, double second, double tert)
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{
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double norm = 1.0 / (prim + second*2 + tert*2);
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prim *= norm;
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second *= norm;
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tert *= norm;
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for(unsigned i = 0; i < 256; i++)
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{
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unsigned b = (i << 8);
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unsigned s = round(second * b);
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unsigned t = round(tert * b);
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unsigned p = b - (2*s + 2*t);
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m_data[3*i + 1] = s; /* secondary */
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m_data[3*i + 2] = t; /* tertiary */
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m_data[3*i ] = p; /* primary */
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}
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}
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unsigned convolution(const int8u* covers, int i0, int i_min, int i_max) const
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{
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unsigned sum = 0;
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int k_min = (i0 >= i_min + 2 ? -2 : i_min - i0);
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int k_max = (i0 <= i_max - 2 ? 2 : i_max - i0);
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for (int k = k_min; k <= k_max; k++)
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{
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/* select the primary, secondary or tertiary channel */
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int channel = abs(k) % 3;
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int8u c = covers[i0 + k];
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sum += m_data[3*c + channel];
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}
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return (sum + 128) >> 8;
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}
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private:
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unsigned short m_data[256*3];
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};
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//========================================================pixfmt_rgb24_lcd
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class pixfmt_rgb24_lcd
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{
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public:
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typedef rgba8 color_type;
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typedef rendering_buffer::row_data row_data;
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typedef color_type::value_type value_type;
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typedef color_type::calc_type calc_type;
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//--------------------------------------------------------------------
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pixfmt_rgb24_lcd(rendering_buffer& rb, const lcd_distribution_lut& lut)
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: m_rbuf(&rb), m_lut(&lut)
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{
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}
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//--------------------------------------------------------------------
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unsigned width() const {
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return m_rbuf->width() * 3;
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}
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unsigned height() const {
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return m_rbuf->height();
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}
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// This method should never be called when using the scanline_u8.
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// The use of scanline_p8 should be avoided because if does not works
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// properly for rendering fonts because single hspan are split in many
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// hline/hspan elements and pixel whitening happens.
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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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void copy_hline(int x, int y, unsigned len, const color_type& c)
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{
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int xr = x - (x % 3);
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int8u* p = m_rbuf->row_ptr(y) + xr;
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for (int ilen = len; ilen > 0; p += 3, ilen -= 3)
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{
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p[0] = c.r;
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p[1] = c.g;
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p[2] = c.b;
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}
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}
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//--------------------------------------------------------------------
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void blend_solid_hspan(int x, int y,
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unsigned len,
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const color_type& c,
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const int8u* covers)
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{
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unsigned rowlen = width();
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int cx = (x - 2 >= 0 ? -2 : -x);
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int cx_max = (len + 2 <= rowlen ? len + 1 : rowlen - 1);
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int i = (x + cx) % 3;
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int8u rgb[3] = { c.r, c.g, c.b };
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int8u* p = m_rbuf->row_ptr(y) + (x + cx);
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for (/* */; cx <= cx_max; cx++)
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{
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unsigned c_conv = m_lut->convolution(covers, cx, 0, len - 1);
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unsigned alpha = (c_conv + 1) * (c.a + 1);
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unsigned dst_col = rgb[i], src_col = (*p);
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*p = (int8u)((((dst_col - src_col) * alpha) + (src_col << 16)) >> 16);
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p ++;
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i = (i + 1) % 3;
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}
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}
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private:
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rendering_buffer* m_rbuf;
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const lcd_distribution_lut* m_lut;
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};
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template <class Gamma>
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class pixfmt_rgb24_lcd_gamma
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{
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public:
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typedef rgba8 color_type;
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typedef rendering_buffer::row_data row_data;
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typedef color_type::value_type value_type;
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typedef color_type::calc_type calc_type;
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//--------------------------------------------------------------------
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pixfmt_rgb24_lcd_gamma(rendering_buffer& rb, const lcd_distribution_lut& lut, const Gamma& gamma)
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: m_rbuf(&rb), m_lut(&lut), m_gamma(gamma)
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{
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}
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//--------------------------------------------------------------------
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unsigned width() const {
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return m_rbuf->width() * 3;
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}
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unsigned height() const {
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return m_rbuf->height();
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}
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// This method should never be called when using the scanline_u8.
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// The use of scanline_p8 should be avoided because if does not works
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// properly for rendering fonts because single hspan are split in many
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// hline/hspan elements and pixel whitening happens.
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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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void copy_hline(int x, int y, unsigned len, const color_type& c)
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{
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int xr = x - (x % 3);
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int8u* p = m_rbuf->row_ptr(y) + xr;
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for (int ilen = len; ilen > 0; p += 3, ilen -= 3)
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{
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p[0] = c.r;
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p[1] = c.g;
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p[2] = c.b;
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}
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}
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//--------------------------------------------------------------------
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void blend_solid_hspan(int x, int y,
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unsigned len,
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const color_type& c,
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const int8u* covers)
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{
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unsigned rowlen = width();
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int cx = (x - 2 >= 0 ? -2 : -x);
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int cx_max = (len + 2 <= rowlen ? len + 1 : rowlen - 1);
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int i = (x + cx) % 3;
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int8u rgb[3] = { c.r, c.g, c.b };
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int8u* p = m_rbuf->row_ptr(y) + (x + cx);
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for (/* */; cx <= cx_max; cx++)
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{
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unsigned c_conv = m_lut->convolution(covers, cx, 0, len - 1);
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unsigned alpha = (c_conv + 1) * (c.a + 1);
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unsigned dst_col = m_gamma.dir(rgb[i]), src_col = m_gamma.dir(*p);
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*p = m_gamma.inv((((dst_col - src_col) * alpha) + (src_col << 16)) >> 16);
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p ++;
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i = (i + 1) % 3;
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}
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}
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private:
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rendering_buffer* m_rbuf;
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const lcd_distribution_lut* m_lut;
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const Gamma& m_gamma;
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};
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}
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#endif
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