78 lines
2.3 KiB
C++
78 lines
2.3 KiB
C++
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#include "effects.hpp"
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/*******************************************************************************
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** EffectTile
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*******************************************************************************/
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void
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EffectTile(Picture* dst, Picture* src, int dx, int dy)
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{
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while (dx < 0) dx += src->width;
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while (dy < 0) dy += src->height;
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dx = (dx % src->width ) - src->width;
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dy = (dy % src->height) - src->height;
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for (int y = dy; y < dst->height; y += src->height)
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{
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for (int x = dx; x < dst->width; x += src->width)
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{
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PictureCopy(
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PICTURE_COPY,
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dst, x, y, x + src->width, y + src->height,
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src, 0, 0, src->width, src->height,
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0, 0, 0);
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}
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}
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}
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/*******************************************************************************
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** EffectDownSample
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*******************************************************************************/
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void
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EffectDownSample(Picture* dst, Picture* src)
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{
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PictureCreate(dst, src->width >> 1, src->height >> 1, 0, 0);
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for (int y = 0; y < dst->height; y++)
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{
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Pixel* O = dst->pixels[y];
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Pixel* A = src->pixels[(y << 1) + 0];
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Pixel* B = src->pixels[(y << 1) + 1];
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for (int x = 0; x < dst->width; x++)
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{
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*O++ = PIXEL_BLEND(PIXEL_BLEND(*A++, *B++), PIXEL_BLEND(*A++, *B++));
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}
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}
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}
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/*******************************************************************************
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** EffectRipple
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*******************************************************************************/
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void
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EffectRipple(Picture* dst, Picture* src, float wavelength, float amplitude, float offset)
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{
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int w = src->width;
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int h = src->height;
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assert(src != dst && dst->width == w && dst->height == h);
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for (int y = 0; y < h; y++)
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{
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int x = Round(sin((y * wavelength + offset) * DTOR) * amplitude);
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PictureCopy(PICTURE_COPY,
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dst, x, y, x + w, y + 1,
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src, 0, y, w, y + 1,
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0, 0, 0);
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PictureCopy(PICTURE_COPY,
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dst, x - w, y, x, y + 1,
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src, 0, y, w, y + 1,
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0, 0, 0);
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PictureCopy(PICTURE_COPY,
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dst, x + w, y, x + w + w, y + 1,
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src, 0, y, w, y + 1,
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0, 0, 0);
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}
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}
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