mirror of
https://github.com/isometimes/rpi4-osdev
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99 lines
2.3 KiB
C
99 lines
2.3 KiB
C
#include "wgt.h"
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#define fastcopy memcpy
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void wsetscreen (block image)
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{
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if (image == NULL)
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{
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abuf = fbuf;
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WGT_SYS.xres = WGT_SYS.screenwidth;
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WGT_SYS.yres = WGT_SYS.screenheight;
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}
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else
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{
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WGT_SYS.xres = wgetblockwidth (image); /* Get virtual screen size */
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WGT_SYS.yres = wgetblockheight (image);
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image += 2;
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abuf = image;
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}
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tx = 0;
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ty = 0;
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bx = WGT_SYS.xres - 1;
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by = WGT_SYS.yres - 1;
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}
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void wnormscreen (void)
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{
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abuf = fbuf;
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WGT_SYS.xres = WGT_SYS.screenwidth;
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WGT_SYS.yres = WGT_SYS.screenheight;
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tx = 0;
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ty = 0;
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bx = WGT_SYS.xres - 1;
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by = WGT_SYS.yres - 1;
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}
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void wcopyscreen (short x, short y, short x2, short y2, block source, short destx, short desty, block dest)
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{
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unsigned int swidth, dwidth;
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short width, height, display;
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short ctr; /* Y line counter */
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if (source == NULL)
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{
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source = fbuf; /* Set to visual screen */
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swidth = 320;
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}
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else {
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swidth = *source;
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source += 2; /* Skip over width and height */
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}
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width = abs (x - x2) + 1; /* Width of each row to copy */
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height = abs (y - y2) + 1; /* Height of area to copy */
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if (destx + width > bx)
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display = bx + 1 - destx;
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else display = width; /* Clip width */
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if (height > (by + 1 - desty))
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height = (by + 1 - desty);
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source += x + (y * swidth); /* Clip height */
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if (desty < ty)
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{
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source += (ty - desty) * swidth;
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height -= ty - desty;
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desty = ty;
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} /* clip y */
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if (destx < tx)
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{
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source += tx - destx;
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display -= tx - destx;
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destx = tx;
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} /* clip x */
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if (dest == NULL)
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{
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dest = fbuf; /* Set to visual screen */
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dwidth = 320;
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}
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else
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{
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dwidth = *dest;
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dest += 2;
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}
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/* Skip over width & height in image data */
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dest += destx + (desty * dwidth); /* Find row offset in image data */
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if ((height > 0) && (display > 0))
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for (ctr = y; ctr < y + height; ctr++)
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{
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fastcopy (dest, source, display); /* Copy DISPLAY bytes to dest */
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source += swidth; /* Advance one row */
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dest += dwidth;
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}
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}
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