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| 1 | pmbaty | 1 | /* |
| 2 | * Portions of this file are copyright Rebirth contributors and licensed as |
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| 3 | * described in COPYING.txt. |
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| 4 | * Portions of this file are copyright Parallax Software and licensed |
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| 5 | * according to the Parallax license below. |
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| 6 | * See COPYING.txt for license details. |
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| 7 | |||
| 8 | THE COMPUTER CODE CONTAINED HEREIN IS THE SOLE PROPERTY OF PARALLAX |
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| 9 | SOFTWARE CORPORATION ("PARALLAX"). PARALLAX, IN DISTRIBUTING THE CODE TO |
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| 10 | END-USERS, AND SUBJECT TO ALL OF THE TERMS AND CONDITIONS HEREIN, GRANTS A |
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| 11 | ROYALTY-FREE, PERPETUAL LICENSE TO SUCH END-USERS FOR USE BY SUCH END-USERS |
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| 12 | IN USING, DISPLAYING, AND CREATING DERIVATIVE WORKS THEREOF, SO LONG AS |
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| 13 | SUCH USE, DISPLAY OR CREATION IS FOR NON-COMMERCIAL, ROYALTY OR REVENUE |
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| 14 | FREE PURPOSES. IN NO EVENT SHALL THE END-USER USE THE COMPUTER CODE |
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| 15 | CONTAINED HEREIN FOR REVENUE-BEARING PURPOSES. THE END-USER UNDERSTANDS |
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| 16 | AND AGREES TO THE TERMS HEREIN AND ACCEPTS THE SAME BY USE OF THIS FILE. |
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| 17 | COPYRIGHT 1993-1998 PARALLAX SOFTWARE CORPORATION. ALL RIGHTS RESERVED. |
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| 18 | */ |
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| 19 | |||
| 20 | /* |
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| 21 | * |
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| 22 | * Graphical routines for drawing solid scanlines. |
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| 23 | * |
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| 24 | */ |
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| 25 | |||
| 26 | #include <algorithm> |
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| 27 | #include <string.h> |
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| 28 | #include "gr.h" |
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| 29 | #include "grdef.h" |
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| 30 | |||
| 31 | namespace dcx { |
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| 32 | |||
| 33 | static void gr_linear_darken(uint8_t *const dest, unsigned darkening_level, unsigned count, const gft_array1 &fade_table) |
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| 34 | { |
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| 35 | auto &t = fade_table[darkening_level]; |
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| 36 | const auto predicate = [&](const uint8_t c) { return t[c]; }; |
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| 37 | std::transform(dest, dest + count, dest, predicate); |
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| 38 | } |
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| 39 | |||
| 40 | #define gr_linear_stosd(D,C,N) memset(D,C,N) |
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| 41 | |||
| 42 | #if DXX_USE_OGL |
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| 43 | static |
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| 44 | #endif |
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| 45 | void gr_uscanline(grs_canvas &canvas, const unsigned x1, const unsigned x2, const unsigned y, const uint8_t color) |
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| 46 | { |
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| 47 | switch(canvas.cv_bitmap.get_type()) |
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| 48 | { |
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| 49 | case bm_mode::linear: |
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| 50 | #if DXX_USE_OGL |
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| 51 | case bm_mode::ogl: |
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| 52 | #endif |
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| 53 | { |
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| 54 | const auto data = &canvas.cv_bitmap.get_bitmap_data()[canvas.cv_bitmap.bm_rowsize * y + x1]; |
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| 55 | const auto cv_fade_level = canvas.cv_fade_level; |
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| 56 | const auto count = x2 - x1 + 1; |
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| 57 | if (cv_fade_level >= gr_fade_table.size()) |
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| 58 | gr_linear_stosd(data, static_cast<uint8_t>(color), count); |
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| 59 | else |
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| 60 | gr_linear_darken(data, cv_fade_level, count, gr_fade_table); |
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| 61 | } |
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| 62 | break; |
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| 63 | } |
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| 64 | } |
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| 65 | |||
| 66 | void gr_scanline(grs_canvas &canvas, int x1, int x2, const unsigned y, const uint8_t color) |
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| 67 | { |
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| 68 | const auto maxy = (canvas.cv_bitmap.bm_h - 1); |
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| 69 | if (y >= maxy) |
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| 70 | return; |
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| 71 | |||
| 72 | if (x2 < x1) |
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| 73 | std::swap(x1, x2); |
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| 74 | |||
| 75 | const auto maxx = (canvas.cv_bitmap.bm_w - 1); |
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| 76 | if (x1 > maxx) return; |
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| 77 | if (x2 < MINX) return; |
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| 78 | |||
| 79 | if (x1 < MINX) x1 = MINX; |
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| 80 | if (x2 > maxx) x2 = maxx; |
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| 81 | gr_uscanline(canvas, x1, x2, y, color); |
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| 82 | } |
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| 83 | |||
| 84 | } |