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https://github.com/isometimes/rpi4-osdev
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36 lines
774 B
C
36 lines
774 B
C
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#include "wgt.h"
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void wdissolve (block sourceimage, short *pattern, short speed)
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{
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short j, k, l, t, a, b;
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unsigned short addr;
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t = *pattern;
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pattern++;
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for (j = 0; j < t; j++)
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{
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a = *pattern;
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pattern++;
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b = *pattern;
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pattern++;
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delay (speed);
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for (k = 0; k < WGT_SYS.yres; k += 16)
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/* Since the fade pattern matrix is 16x16, we change every
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16th pixel at the same time. */
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{
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for (l = 0; l < WGT_SYS.xres; l += 16)
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{
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if ((k + b < by + 1) & (l + a < bx + 1) & (k + b >= ty)
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& (l + a >= tx))
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/* Make sure the pixel is within clipping */
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{
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addr = ((k + b) * WGT_SYS.xres + l + a);
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abuf[addr] = sourceimage[addr + 2];
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}
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}
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}
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}
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}
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