1 /* 2 * Copyright 2005, Stephan Aßmus <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 "Constant Composite" mode on B_RGBA32. 7 * 8 */ 9 10 #ifndef DRAWING_MODE_ALPHA_CC_SUBPIX_H 11 #define DRAWING_MODE_ALPHA_CC_SUBPIX_H 12 13 #include "DrawingMode.h" 14 #include "GlobalSubpixelSettings.h" 15 16 // BLEND_ALPHA_CC_SUBPIX 17 #define BLEND_ALPHA_CC_SUBPIX(d, r, g, b, a1, a2, a3) \ 18 { \ 19 BLEND_COMPOSITE16_SUBPIX(d, r, g, b, a1, a2, a3); \ 20 } 21 22 23 // blend_solid_hspan_alpha_cc_subpix 24 void 25 blend_solid_hspan_alpha_cc_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 uint8 hAlpha = pattern->HighColor().alpha; 31 uint16 alphaRed; 32 uint16 alphaGreen; 33 uint16 alphaBlue; 34 const int subpixelL = gSubpixelOrderingRGB ? 2 : 0; 35 const int subpixelM = 1; 36 const int subpixelR = gSubpixelOrderingRGB ? 0 : 2; 37 do { 38 alphaRed = hAlpha * covers[subpixelL]; 39 alphaGreen = hAlpha * covers[subpixelM]; 40 alphaBlue = hAlpha * covers[subpixelR]; 41 rgb_color color = pattern->ColorAt(x, y); 42 BLEND_ALPHA_CC_SUBPIX(p, color.red, color.green, color.blue, 43 alphaBlue, alphaGreen, alphaRed); 44 covers += 3; 45 p += 4; 46 x++; 47 len -= 3; 48 } while (len); 49 } 50 51 #endif // DRAWING_MODE_ALPHA_CC_SUBPIX_H 52 53