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https://github.com/isometimes/rpi4-osdev
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85 lines
1.7 KiB
C
85 lines
1.7 KiB
C
#include "wgt.h"
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void wsline (short x, short y, short x2, short y2, short *y_array)
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{
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short t, distance;
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short wx, wy, dx, dy, bdx, bdy, incx, incy;
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dx = x2 - x;
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dy = y2 - y;
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t = 0; wx = 0; wy = 0;
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if (dy < 0) incy = - 1;
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else incy = 1;
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if (dx < 0) incx = - 1;
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else incx = 1;
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bdx = abs (dx);
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bdy = abs (dy);
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if (bdx > bdy) distance = bdx;
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else distance = bdy;
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y_array += x;
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if (distance == bdx)
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{
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while (t <= distance)
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{
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if ((x >= tx) && (y >= ty) && (y <= by) && (x <= bx))
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*y_array = y;
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/* instead of plotting pixels, just store the y value in an array */
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wy += bdy;
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x += incx;
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y_array++;
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t ++;
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if (wy >= distance)
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{
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wy -= distance;
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y += incy;
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}
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}
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}
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else
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{
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while (t <= distance)
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{
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if ((x >= tx) && (y >= ty) && (y <= by) && (x <= bx))
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*y_array = y;
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wx += bdx;
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if (wx >= distance)
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{
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wx -= distance;
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x += incx;
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y_array++;
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}
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y += incy;
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t ++;
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}
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}
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}
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void wwarp (short sx, short ex, short *tpy, short *bty, block ptr, short mode)
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{
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long column;
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int wid;
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short finalwidth;
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short origwidth;
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long xstepper;
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origwidth = wgetblockwidth (ptr);
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/* Get the original width of the block */
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finalwidth = abs (ex - sx) + 1;
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/* Find the new width */
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xstepper = ((long)(origwidth) << 16) / ((long)(finalwidth));
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/* Calculate the amount to add to the source bitmap for every pixel across.
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This is done using a fixed point number by multiplying it by 65536 (<<16)
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and using 0-65535 as a fractional amount. */
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column = 0;
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for (wid = sx; wid <= ex; wid++)
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{
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wresize_column (wid, tpy[wid], bty[wid], ptr, column >> 16, mode);
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column += xstepper;
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}
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}
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