95 lines
2.6 KiB
C++
95 lines
2.6 KiB
C++
/*
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* Portions of this file are copyright Rebirth contributors and licensed as
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* described in COPYING.txt.
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* Portions of this file are copyright Parallax Software and licensed
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* according to the Parallax license below.
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* See COPYING.txt for license details.
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THE COMPUTER CODE CONTAINED HEREIN IS THE SOLE PROPERTY OF PARALLAX
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SOFTWARE CORPORATION ("PARALLAX"). PARALLAX, IN DISTRIBUTING THE CODE TO
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END-USERS, AND SUBJECT TO ALL OF THE TERMS AND CONDITIONS HEREIN, GRANTS A
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ROYALTY-FREE, PERPETUAL LICENSE TO SUCH END-USERS FOR USE BY SUCH END-USERS
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IN USING, DISPLAYING, AND CREATING DERIVATIVE WORKS THEREOF, SO LONG AS
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SUCH USE, DISPLAY OR CREATION IS FOR NON-COMMERCIAL, ROYALTY OR REVENUE
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FREE PURPOSES. IN NO EVENT SHALL THE END-USER USE THE COMPUTER CODE
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CONTAINED HEREIN FOR REVENUE-BEARING PURPOSES. THE END-USER UNDERSTANDS
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AND AGREES TO THE TERMS HEREIN AND ACCEPTS THE SAME BY USE OF THIS FILE.
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COPYRIGHT 1993-1998 PARALLAX SOFTWARE CORPORATION. ALL RIGHTS RESERVED.
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*/
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/*
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*
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* Graphical routines for drawing solid scanlines.
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*
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*/
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#include <algorithm>
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#include <string.h>
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#include "gr.h"
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#include "grdef.h"
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namespace dcx {
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namespace {
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static void gr_linear_darken(uint8_t *const dest, const gr_fade_level darkening_level, const unsigned count, const gft_array1 &fade_table)
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{
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auto &t = fade_table[darkening_level];
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const auto predicate = [&](const uint8_t c) { return t[c]; };
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std::transform(dest, dest + count, dest, predicate);
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}
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}
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#define gr_linear_stosd(D,C,N) memset(D,C,N)
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#if DXX_USE_OGL
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namespace {
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#endif
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void gr_uscanline(grs_canvas &canvas, const unsigned x1, const unsigned x2, const unsigned y, const uint8_t color)
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{
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switch(canvas.cv_bitmap.get_type())
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{
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case bm_mode::linear:
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#if DXX_USE_OGL
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case bm_mode::ogl:
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#endif
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{
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const auto data = &canvas.cv_bitmap.get_bitmap_data()[canvas.cv_bitmap.bm_rowsize * y + x1];
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const auto cv_fade_level = canvas.cv_fade_level;
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const auto count = x2 - x1 + 1;
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if (!gr_fade_table.valid_index(cv_fade_level))
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gr_linear_stosd(data, static_cast<uint8_t>(color), count);
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else
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gr_linear_darken(data, cv_fade_level, count, gr_fade_table);
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}
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break;
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case bm_mode::ilbm:
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case bm_mode::rgb15:
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break;
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}
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}
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#if DXX_USE_OGL
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}
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#endif
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void gr_scanline(grs_canvas &canvas, int x1, int x2, const unsigned y, const uint8_t color)
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{
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const auto maxy = (canvas.cv_bitmap.bm_h - 1);
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if (y >= maxy)
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return;
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if (x2 < x1)
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std::swap(x1, x2);
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const auto maxx = (canvas.cv_bitmap.bm_w - 1);
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if (x1 > maxx) return;
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if (x2 < MINX) return;
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if (x1 < MINX) x1 = MINX;
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if (x2 > maxx) x2 = maxx;
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gr_uscanline(canvas, x1, x2, y, color);
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}
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}
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