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https://github.com/isometimes/rpi4-osdev
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328 lines
8.6 KiB
C
328 lines
8.6 KiB
C
#include "wgt.h"
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void resize_horizontal_line (block src, block dest, unsigned int whole,
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unsigned int xfrac, unsigned short step, short length)
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/* Where:
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src : is a pointer to the source bitmap
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dest : is a pointer to the destination screen
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whole: is the amount of pixels to increase the source pointer for every
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destination pixel across
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xfrac: is the initial fractional portion
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step : is the fractional pixel amount to increase the source pointer for
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every destination pixel across. 1 step = 1/256 of a pixel, so
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every 256 fractional steps, the source pointer is increased by 1.
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length : is the number of pixels to draw
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*/
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{
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unsigned int px;
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for (int i=0; i<length; i++) {
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px = *src;
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xfrac += step;
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if (xfrac > 65535) {
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xfrac %= 65536;
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src++;
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}
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src += whole;
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*dest = px;
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dest++;
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}
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}
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void resize_horizontal_line_xray (block src, block dest, unsigned int whole,
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unsigned int xfrac, unsigned short step, short length)
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/* Where:
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src : is a pointer to the source bitmap
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dest : is a pointer to the destination screen
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whole: is the amount of pixels to increase the source pointer for every
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destination pixel across
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xfrac: is the initial fractional portion
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step : is the fractional pixel amount to increase the source pointer for
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every destination pixel across. 1 step = 1/256 of a pixel, so
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every 256 fractional steps, the source pointer is increased by 1.
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length : is the number of pixels to draw
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*/
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{
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unsigned int px;
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for (int i=0; i<length; i++) {
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px = *src;
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xfrac += step;
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if (xfrac > 65535) {
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xfrac %= 65536;
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src++;
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}
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src += whole;
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if (px != 0) *dest = px;
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dest++;
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}
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}
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void wresize (short x, short y, short x2, short y2, block image, short mode)
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{
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long xdif, ydif;
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long finalwidth, finalheight, endwidth, endheight;
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long origwidth,origheight;
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int i;
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long endx;
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block to, from;
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block fromt;
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unsigned short whole;
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unsigned short step;
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unsigned short ywhole;
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unsigned short ystep;
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unsigned long xstepper, ystepper;
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unsigned long yfrac;
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unsigned long xfrac;
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origwidth = wgetblockwidth (image);
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origheight = wgetblockheight (image);
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/* Get the original width and height of the block */
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finalwidth = abs (x2 - x) + 1;
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finalheight = abs (y2 - y) + 1;
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/* Find the new width and height */
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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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whole = xstepper >> 16; /* Keep the whole amount */
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step = xstepper - whole * 65536;
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/* and the fractional amount (1/65536th of a pixel) */
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ystepper = ((long)(origheight) << 16) / ((long)(finalheight));
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ywhole = ystepper >> 16;
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ystep = ystepper - ywhole * 65536;
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/* Do the same with the vertical height */
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to = &abuf[y*WGT_SYS.xres + x];
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/* Make an initial pointer to the destination */
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from = &image[2];
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/* Skip over the width/height integers */
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endwidth = finalwidth;
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endheight = finalheight;
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xdif = 0;
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/* Differences between actual coordinates and */
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ydif = 0; /* the clipped coordinates. */
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yfrac = 0; /* Reset step to 0 */
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xfrac = 0; /* Reset step to 0 */
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/* Do the clipping */
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if (x < tx)
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{
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xdif = tx - x;
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/* Find the difference between x<--->tx */
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/* if we know that tx is the greater number */
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to += xdif;
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/* Make sure dest is within left clipping */
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endwidth -= xdif;
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/* Decrease the horizontal number of pixels drawn */
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xfrac = (xdif * step) % 65536;
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from += ((int)xdif * xstepper) >> 16;
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/* Now adjust the source pointer according to the whole and step values.
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We multiply the number of pixels and the rate and add this to our
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pointer. The fractional part is divided by 65536 because we're only
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concerned with the whole pixel amounts. */
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}
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if (y < ty)
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{
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ydif = ty - y;
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endheight = finalheight - (ydif);
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to += ydif * WGT_SYS.xres;
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yfrac = (ydif * ystep) % 65536;
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/* Do the same for the height */
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from += (((long)ydif * (long)ystepper)>>16) * (long)origwidth;
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/* Same as above but also multiply be the width of the source since we're
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going down a row instead of one pixel across. */
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}
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if (x + finalwidth - 1 > bx)
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endwidth -= ((x + finalwidth - 1) - bx);
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if (y + finalheight - 1 > by)
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endheight -= ((y + finalheight - 1) - by);
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/* Clip the right and bottom edges simply by decreasing the number of
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pixels drawn. */
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if ((x2 > tx) && (y2 > ty) && (endwidth > 0))
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/* If it is even on the screen at all */
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{
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endx = endwidth;
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if (mode == NORMAL) /* Plain and simple */
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for (i = 1; i <= endheight; i++) /* Vertical loop */
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{
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fromt = from;
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resize_horizontal_line (fromt, to, whole, xfrac, step, endx);
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/* Resize one line using our assembly routine */
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to += endx;
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yfrac += ystep;
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if (yfrac > 65535)
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{
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yfrac -= 65535;
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from += origwidth;
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}
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from += ywhole * origwidth;
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to += WGT_SYS.xres - endwidth;
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}
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else /* Use XRAY mode */
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for (i = 1; i <= endheight; i++)
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{
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fromt = from;
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resize_horizontal_line_xray (fromt, to, whole, xfrac, step, endx);
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to += endx;
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yfrac += ystep;
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if (yfrac > 65535)
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{
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yfrac -= 65535;
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from += origwidth;
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}
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from += ywhole*origwidth;
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to += WGT_SYS.xres - endwidth;
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}
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}
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}
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int resize_width_asm;
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int screen_width_asm;
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void resize_vertical_line (block src, block dest, unsigned int whole, unsigned long xfrac, unsigned short step, int length)
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{
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int resize_width_asm2;
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int screen_width_asm2;
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resize_width_asm2 = resize_width_asm;
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screen_width_asm2 = screen_width_asm;
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unsigned int px;
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vresizeloop:
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px = *src;
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src += whole;
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xfrac += step;
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if (xfrac > 65535) {
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xfrac %= 65536;
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} else {
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goto novres;
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}
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src += resize_width_asm2;
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novres:
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*dest = px;
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dest += screen_width_asm2;
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length--;
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if (length != 0) goto vresizeloop;
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}
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void resize_vertical_line_xray (block src, block dest, unsigned int whole, unsigned long xfrac, unsigned short step, int length)
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{
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int resize_width_asm2;
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int screen_width_asm2;
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resize_width_asm2 = resize_width_asm;
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screen_width_asm2 = screen_width_asm;
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unsigned int px;
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vresizeloop:
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px = *src;
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src += whole;
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xfrac += step;
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if (xfrac > 65535) {
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xfrac %= 65536;
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} else {
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goto novres;
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}
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src += resize_width_asm2;
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novres:
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if (px != 0) *dest = px;
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dest += screen_width_asm2;
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length--;
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if (length != 0) goto vresizeloop;
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}
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void wresize_column (short x, short y, short y2, block image, short column, short mode)
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{
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int origheight;
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int finalheight;
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int endheight;
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long ystepper;
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long ywhole;
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short ystep;
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int yfrac;
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long ydif;
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block dest;
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block src;
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/* Skip over the width/height integers */
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origheight = wgetblockheight (image);
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resize_width_asm = wgetblockwidth (image);
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src = image + 2 + column;
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if (y2 < y)
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{
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src += (origheight - 1) * resize_width_asm;
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origheight *= -1;
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ydif = y;
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y = y2;
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y2 = ydif;
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}
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finalheight = (y2 - y) + 1;
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if (finalheight > 0)
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{
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ystepper = (((long)origheight << 16) / (long)finalheight);
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ywhole = ystepper >> 16;
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ystep = ystepper - (ywhole << 16);
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dest = &abuf[y * WGT_SYS.xres + x];
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/* Make an initial pointer to the destination */
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endheight = finalheight;
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/* Differences between actual coordinates and */
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ydif = 0; /* the clipped coordinates. */
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yfrac = 0; /* Reset step to 0 */
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if (y < ty)
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{
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ydif = ty - y;
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endheight = finalheight - ydif;
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dest += ydif * WGT_SYS.xres;
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yfrac = (ydif * ystep) % 65536;
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src += ((ydif * ystepper) >> 16) * resize_width_asm;
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}
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if (y + finalheight > by + 1)
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endheight -= ((y + finalheight) - by);
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/* Clip the bottom edge by decreasing the number of pixels drawn. */
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if (endheight > 0)
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{
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screen_width_asm = WGT_SYS.xres;
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ywhole *= resize_width_asm;
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if (mode == NORMAL)
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resize_vertical_line (src, dest, ywhole, yfrac, ystep, endheight);
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else
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resize_vertical_line_xray (src, dest, ywhole, yfrac, ystep, endheight);
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}
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}
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}
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