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Adding example 8 (region fill)
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140
part12-wgt/fill.c
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140
part12-wgt/fill.c
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#include "wgt.h"
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#include "include/mem.h"
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static short start, end; /* Start and end x coords for filled line */
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extern short bx, by, tx, ty; /* Clipping variables */
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typedef struct {
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short x, y, start, finish; /* values for filled scan line */
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void *next; /* Points to next node in linked list */
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} node;
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static node *push (node *s, short x, short y)
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{
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node *newnode;
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s->start = start; /* Store start of line */
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s->finish = end; /* Store end of line */
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newnode = (node *)malloc (sizeof (node));
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/* Allocate new node */
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newnode->next = (node *)s; /* Make it point to previous node */
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newnode->x = x; /* Store current x and y */
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newnode->y = y;
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return newnode; /* Return pointer to new head node */
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}
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static node *pop (node *s, short *x, short *y)
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{
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node *headnode;
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headnode = s; /* Store pointer to head node */
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s = (node *)s->next; /* Go back in the chain */
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*x = s->x;
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/* Find out where we were last (in that row) */
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*y = s->y;
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start = s->start; /* Restore start and end of line */
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end = s->finish;
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free (headnode); /* Free head node, no longer needed */
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return s; /* Return pointer to new head node */
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}
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void wregionfill (short x, short y)
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{
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short color2fill; /* Color to change */
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node *s; /* Pointer to head of linked list */
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block ptr; /* Used to scan through screen data */
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if ((x >= tx) && (y >= ty) && (x <= bx) && (y <= by) &&
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(abuf[WGT_SYS.xres * y + x] != currentcolor))
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{
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/* Only fill if within clipping region and color to fill isn't same as
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color we're filling with */
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color2fill = abuf[WGT_SYS.xres * y + x]; /* Find out color to fill */
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s = (node *)malloc (sizeof (node));
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/* Allocate head node */
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s->next = NULL; /* No previous nodes */
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s->x = x; /* Store current coords */
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s->y = y;
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filllabel1:
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;
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start = x;
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/* Start of line will be our x position */
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ptr = &abuf[WGT_SYS.xres * y + start - 1]; /* Make pointer to screen data */
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while ((start > tx) && (*ptr == color2fill))
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{
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/* Now scan left until we hit a different color */
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ptr--;
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start--;
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}
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end = x;
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/* End of line will be our y position */
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ptr = &abuf[WGT_SYS.xres * y + end + 1];
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while ((end < bx) && (*ptr == color2fill))
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{
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/* Scan right until we hit a different color */
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end++;
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ptr++;
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}
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memset (&abuf[WGT_SYS.xres * y + start], currentcolor, end - start + 1);
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/* Fill line segment */
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filllabel2:
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;
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if (y < by)
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{
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/* Proceed to check below every pixel in current line segment to see
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if we can advance down a row and continue the fill */
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ptr = &abuf[(y + 1) * WGT_SYS.xres + start];
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for (x = start; x <= end; x++)
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{
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if (*ptr == color2fill)
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{
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/* We've found a way to 'leak' into next row, store our
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position */
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s = push (s, x, y + 1);
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y++;
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/* Now move down a row */
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goto filllabel1;
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}
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ptr++;
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}
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}
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/* The next area of code does the same thing, except checking upwards */
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if (y > ty)
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{
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ptr = &abuf[(y - 1) * WGT_SYS.xres + start];
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for (x = start; x <= end; x++)
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{
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if (*ptr == color2fill)
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{
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s = push (s, x, y - 1);
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y--;
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goto filllabel1;
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}
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ptr++;
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}
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}
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/* Now we've filled all we can in one direction, move to previous node */
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if (s->next != NULL)
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{
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s = pop (s, &x, &y);
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/* Get data for previous node so we can continue scanning */
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goto filllabel2;
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}
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/* Free the node now that we're done with it */
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free (s);
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}
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}
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3
part12-wgt/include/mem.h
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3
part12-wgt/include/mem.h
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void mem_init();
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void *malloc(unsigned int size);
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void free(void *ptr);
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43
part12-wgt/lib/mem.c
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43
part12-wgt/lib/mem.c
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extern unsigned char _end[];
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// Define the heap
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unsigned char *HEAP_START = &_end[0];
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unsigned int HEAP_SIZE = 0x40000000; // Max heap size is 1Gb
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unsigned char *HEAP_END;
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// Set up some globals
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unsigned char *freeptr;
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unsigned int allocated = 0;
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void mem_init()
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{
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// Align the start of heap to an 8-byte boundary
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if ((long)&HEAP_START % 8 != 0) {
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HEAP_START += 8 - ((long)&HEAP_START % 8);
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}
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HEAP_END = (unsigned char *)(HEAP_START + HEAP_SIZE);
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}
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void *malloc(unsigned int size)
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{
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if (size > 0) {
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void *allocated = freeptr;
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if ((unsigned char *)(allocated + size) > HEAP_END) {
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return 0;
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} else {
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freeptr += size;
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allocated += size;
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return allocated;
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}
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}
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return 0;
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}
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void free(void *ptr) {
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// TODO
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}
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@ -79,3 +79,4 @@ void wtextcolor (unsigned int col);
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void wtextbackground (unsigned int col);
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void wtexttransparent (short transparent);
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void wtextgrid (short onoff);
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void wregionfill (short x, short y);
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101
part12-wgt/wgt08.c
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101
part12-wgt/wgt08.c
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#include "wgt.h"
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// ######## REQUIRED FUNCTIONS ########
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unsigned long state0 = 1000;
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unsigned long state1 = 2000;
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unsigned long rand(void)
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{
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unsigned long s1 = state0;
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unsigned long s0 = state1;
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state0 = s0;
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s1 ^= s1 << 23;
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s1 ^= s1 >> 17;
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s1 ^= s0;
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s1 ^= s0 >> 26;
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state1 = s1;
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return state0 + state1;
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}
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void wait_msec(unsigned int n)
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{
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register unsigned long f, t, r;
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// Get the current counter frequency
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asm volatile ("mrs %0, cntfrq_el0" : "=r"(f));
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// Read the current counter
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asm volatile ("mrs %0, cntpct_el0" : "=r"(t));
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// Calculate expire value for counter
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t+=((f/1000)*n)/1000;
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do{asm volatile ("mrs %0, cntpct_el0" : "=r"(r));}while(r<t);
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}
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// ######## STUB FUNCTIONS ########
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unsigned int kb = 0;
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unsigned int kbhit(void) {
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kb++;
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return kb / 500;
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}
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void getch(void) {
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wait_msec(0x500000);
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kb = 0;
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}
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// ######## WGT EXAMPLES ########
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void wgt08()
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{
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short x;
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vga256 ();
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wcls (vgapal[0]);
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wsetcolor (vgapal[1]);
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wcircle (960, 540, 270); /* try filling a circle */
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getch ();
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wsetcolor (vgapal[40]);
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wregionfill (960, 540);
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wsetcolor (vgapal[170]);
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wregionfill (0, 0);
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getch ();
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wcls (0);
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for (x = 1; x < 10000; x++) /* try filling 10,000 random pixels */
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{
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wsetcolor (vgapal[rand() % 255]);
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wputpixel (rand() % 1920, rand() % 1080);
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}
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getch ();
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wsetcolor (vgapal[40]);
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wclip (300, 270, 1500, 810); /* fill works with clipping too! */
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wregionfill (960, 540);
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wsetcolor (vgapal[7]);
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wclip (60, 54, 240, 216);
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wregionfill (120, 108);
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wsetcolor (vgapal[9]);
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wclip (1560, 864, 1800, 1026);
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wregionfill (1620, 918);
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wsetcolor (vgapal[10]);
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wclip (0, 0, 1919, 1079);
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wregionfill (0, 0);
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getch ();
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}
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void main()
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{
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wgt08();
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while (1);
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}
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