Mercurial > hg > dmlib
view src/dmscaledblit.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 * -- Scaled sprite / surface blitting function template * Programmed and designed by Matti 'ccr' Hamalainen * (C) Copyright 2011-2015 Tecnic Software productions (TNSP) */ int DM_BLITFUNC_NAME (SDL_Surface *src, const int x0, const int y0, const int dwidth, const int dheight, SDL_Surface *dst #ifdef DM_BLITFUNC_ARGS DM_BLITFUNC_ARGS #endif ) #ifdef DM_HEADER ; #else { int yc; DMFixedPoint32 xv, yv, dx, dy; DMQValue xr, yr; #ifdef DM_BLITFUNC_VARS DM_BLITFUNC_VARS #endif // Clip coordinates if (dmScaledClipCoord(&xr, x0, src->w, dwidth, dst->clip_rect.x, dst->clip_rect.x + dst->clip_rect.w) || dmScaledClipCoord(&yr, y0, src->h, dheight, dst->clip_rect.y, dst->clip_rect.y + dst->clip_rect.h)) return -1; #ifdef DM_BLITFUNC_INIT DM_BLITFUNC_INIT #endif // Calculate "final" initial source bitmap offsets FP_CONV(dy, yr.voffs); FP_MUL_R(yv, dy, yr.vdelta); FP_CONV(dx, xr.voffs); FP_MUL_R(dx, dx, xr.vdelta); // Take pitch into account const int dstadd = xr.vadd - dst->clip_rect.w + dst->clip_rect.x + (dst->pitch / DM_BLITFUNC_DST_BYTES); // Blit scaled DM_BLITFUNC_DST_TYPE * dp = ((DM_BLITFUNC_DST_TYPE *) dst->pixels) + (yr.v0 * dst->pitch) / DM_BLITFUNC_DST_BYTES + xr.v0; for (yc = yr.v0; yc < yr.v1; yc++) { const DM_BLITFUNC_SRC_TYPE * sp = ((DM_BLITFUNC_SRC_TYPE *) src->pixels) + (FP_GETH16(yv) * src->pitch) / DM_BLITFUNC_SRC_BYTES; int xc; #ifdef DM_BLITFUNC_INNER_INIT DM_BLITFUNC_INNER_INIT #endif for (xv.dw = dx.dw, xc = xr.v0; xc < xr.v1; xc++) { DM_BLITFUNC_INNER FP_ADD(xv, xr.vdelta); } FP_ADD(yv, yr.vdelta); dp += dstadd; } #ifdef DM_BLITFUNC_FINISH DM_BLITFUNC_FINISH #endif return 0; } #endif #undef DM_BLITFUNC_NAME #undef DM_BLITFUNC_ARGS #undef DM_BLITFUNC_SRC_BYTES #undef DM_BLITFUNC_DST_BYTES #undef DM_BLITFUNC_SRC_TYPE #undef DM_BLITFUNC_DST_TYPE #undef DM_BLITFUNC_VARS #undef DM_BLITFUNC_INIT #undef DM_BLITFUNC_INNER_INIT #undef DM_BLITFUNC_INNER #undef DM_BLITFUNC_FINISH