1/* 2 * Copyright 2005, Stephan A��mus <superstippi@gmx.de>. 3 * Copyright 2008, Andrej Spielmann <andrej.spielmann@seh.ox.ac.uk>. 4 * All rights reserved. Distributed under the terms of the MIT License. 5 * 6 * DrawingMode implementing B_OP_ALPHA in "Pixel Overlay" mode on B_RGBA32. 7 * 8 */ 9 10#ifndef DRAWING_MODE_ALPHA_PO_SUBPIX_H 11#define DRAWING_MODE_ALPHA_PO_SUBPIX_H 12 13#include "DrawingMode.h" 14#include "GlobalSubpixelSettings.h" 15 16// BLEND_ALPHA_PO_SUBPIX 17#define BLEND_ALPHA_PO_SUBPIX(d, r, g, b, a1, a2, a3) \ 18{ \ 19 BLEND16_SUBPIX(d, r, g, b, a1, a2, a3); \ 20} 21 22 23// blend_solid_hspan_alpha_po_subpix 24void 25blend_solid_hspan_alpha_po_subpix(int x, int y, unsigned len, 26 const color_type& c, const uint8* covers, agg_buffer* buffer, 27 const PatternHandler* pattern) 28{ 29 uint8* p = buffer->row_ptr(y) + (x << 2); 30 uint16 alphaRed; 31 uint16 alphaGreen; 32 uint16 alphaBlue; 33 const int subpixelL = gSubpixelOrderingRGB ? 2 : 0; 34 const int subpixelM = 1; 35 const int subpixelR = gSubpixelOrderingRGB ? 0 : 2; 36 do { 37 rgb_color color = pattern->ColorAt(x, y); 38 alphaRed = color.alpha * covers[subpixelL]; 39 alphaGreen = color.alpha * covers[subpixelM]; 40 alphaBlue = color.alpha * covers[subpixelR]; 41 BLEND_ALPHA_PO_SUBPIX(p, color.red, color.green, color.blue, 42 alphaBlue, alphaGreen, alphaRed); 43 covers += 3; 44 p += 4; 45 x++; 46 len -= 3; 47 } while (len); 48} 49 50#endif // DRAWING_MODE_ALPHA_PO_SUBPIX_H 51 52