Mercurial > hg > dmlib
view src/dmdrawline.h @ 2576:812b16ee49db
I had been living under apparent false impression that "realfft.c"
on which the FFT implementation in DMLIB was basically copied from
was released in public domain at some point, but it could very well
be that it never was. Correct license is (or seems to be) GNU GPL.
Thus I removing the code from DMLIB, and profusely apologize to the
author, Philip Van Baren.
It was never my intention to distribute code based on his original
work under a more liberal license than originally intended.
author | Matti Hamalainen <ccr@tnsp.org> |
---|---|
date | Fri, 11 Mar 2022 16:32:50 +0200 |
parents | e06abfde6c39 |
children |
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/* * DMLib * -- Simple Bresenham's style line drawing * Programmed and designed by Matti 'ccr' Hamalainen * (C) Copyright 2011-2015 Tecnic Software productions (TNSP) */ int DM_DRAWLINE_NAME (SDL_Surface *screen, DMFloat fx0, DMFloat fy0, DMFloat fx1, DMFloat fy1, const Uint32 col #ifdef DM_DRAWLINE_ARGS DM_DRAWLINE_ARGS #endif ) #ifdef DM_HEADER ; #else { int dx, dy, xstep, ystep; const int qpitch = screen->pitch / DM_DRAWLINE_DST_BYTES; (void) qpitch; (void) col; // Clipping if (dmClipLineCoordsFloat(screen, &fx0, &fy0, &fx1, &fy1) < 0) return -1; int x0 = fx0, y0 = fy0, x1 = fx1, y1 = fy1; // Compute initial deltas dx = (x1 - x0) * 2; dy = (y1 - y0) * 2; if (dx < 0) { dx = -dx; xstep = -1; } else xstep = 1; if (dy < 0) { dy = -dy; ystep = -1; } else ystep = 1; #ifndef DM_DRAWLINE_SPEC // Compute offsets y0 *= qpitch; y1 *= qpitch; ystep *= qpitch; #endif #ifdef DM_DRAWLINE_INIT DM_DRAWLINE_INIT #endif DM_DRAWLINE_DST_TYPE *pix = (DM_DRAWLINE_DST_TYPE *) screen->pixels; (void) pix; // Continue based on which delta is larger if (dx > dy) { int afrac = dy - (dx / 2.0); while (x0 != x1) { if (afrac >= 0) { y0 += ystep; afrac -= dx; } x0 += xstep; afrac += dy; DM_DRAWLINE_INNER } } else { int afrac = dx - (dy / 2.0); while (y0 != y1) { if (afrac >= 0) { x0 += xstep; afrac -= dy; } y0 += ystep; afrac += dx; DM_DRAWLINE_INNER } } return 0; } #endif #undef DM_DRAWLINE_NAME #undef DM_DRAWLINE_ARGS #undef DM_DRAWLINE_DST_BYTES #undef DM_DRAWLINE_DST_TYPE #undef DM_DRAWLINE_INIT #undef DM_DRAWLINE_INNER