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second: more commenting of box_convert

This commit is contained in:
Vince Weaver 2023-10-04 14:16:11 -04:00
parent 9be823f7c4
commit 7555b4d4f9
1 changed files with 76 additions and 47 deletions
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123
demos/second/part18_3d/auto/box_convert.c
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@ -271,65 +271,89 @@ int create_using_boxes(void) {
int color;
int color_minx,color_maxx,color_miny,color_maxy;
/* Do one color at a time */
/* The color order is picked in advance */
for(color=0;color<16;color++) {
current_color=color_lookup[color].color;
current_color=color_lookup[color].color;
if (current_color==background_color) continue;
/* To save space the Apple II implementation */
/* always clears screen to the background color */
/* for each frame so we assume we don't have to draw it */
if (current_color==background_color) continue;
/* calculate maximum color extent */
find_max_color_extent(current_color,
/* calculate maximum color extent */
/* we don't want rectangles bigger than the region with */
/* that color */
/* Note we have to re-calc this after drawing a box */
find_max_color_extent(current_color,
&color_minx,&color_miny,
&color_maxx,&color_maxy);
/* Try all possible box sizes. */
/* Can be exhaustive as there are only 40x48 possibilities */
/* Table is pre-sorted by size */
for(box=0;box<NUM_BOX_SIZES;box++) {
/* Try all possible box sizes. */
/* We can be exhaustive as there are only 40x48 possibilities */
/* Table is pre-sorted by size */
for(box=0;box<NUM_BOX_SIZES;box++) {
int xx,yy,box_found,color_found,color_found2;
int xx,yy,box_found,color_found,color_found2;
/* check to see if this box size is best fit for color */
for(row=0;row<48-box_sizes[box].y;row++) {
for(col=0;col<40-box_sizes[box].x;col++) {
box_found=1;
color_found=0;
color_found2=0;
/* check to see if this box size is */
/* the best fit for this color */
for(row=0;row<48-box_sizes[box].y;row++) {
for(col=0;col<40-box_sizes[box].x;col++) {
box_found=1;
color_found=0;
color_found2=0;
for(yy=0;yy<box_sizes[box].y;yy++) {
for(xx=0;xx<box_sizes[box].x;xx++) {
/* check to see if box is suitable */
for(yy=0;yy<box_sizes[box].y;yy++) {
for(xx=0;xx<box_sizes[box].x;xx++) {
/* Only a fit if color is included */
/* i.e. don't have one that's all don't cares */
if (framebuffer[xx+col][yy+row]==current_color) {
color_found=1;
}
/* Only a fit if color is included */
/* i.e. don't have one that's all don't cares */
if (framebuffer[xx+col][yy+row]==current_color) {
color_found=1;
}
/* If there's a color that is wrong, early exit */
if ((framebuffer[xx+col][yy+row]==background_color)||
(framebuffer[xx+col][yy+row]==0xff))
{
box_found=0;
break;
}
} // xx
/* If there's a background color */
/* or else a previously drawn box (0xff) */
/* then early exit */
if ((framebuffer[xx+col][yy+row]==
background_color) ||
(framebuffer[xx+col][yy+row]==0xff)) {
box_found=0;
break;
}
/* early exit */
if (!box_found) break;
} // yy
} // xx
/* propogate early exit */
if (!box_found) break;
} // yy
/* This isn't a good fit if rectangle is bigger */
/* Than the minimal rectangle containing the colors */
if (( (col)>=color_minx)&&((col+box_sizes[box].x-1)<=color_maxx)&&
((row)>=color_miny)&&((row+box_sizes[box].y-1)<=color_maxy)) {
color_found2=1;
}
/* This isn't a good fit if rectangle is */
/* bigger than the minimal rectangle */
/* containing the colors */
if (( (col)>=color_minx) &&
((col+box_sizes[box].x-1)<=color_maxx) &&
((row)>=color_miny) &&
((row+box_sizes[box].y-1)<=color_maxy)) {
color_found2=1;
}
/* We found a rectangle! */
/* Box was found, included the color */
/* and not too big */
if ((box_found) &&
(color_found) &&
(color_found2)) {
/* Urgh tab depth too deep */
if ((box_found)&&(color_found)&&(color_found2)) {
if (debug) fprintf(stderr,"Found box c=%d %d,%d to %d,%d\n",
current_color,col,row,col+box_sizes[box].x-1,
row+box_sizes[box].y-1);
row+box_sizes[box].y-1);
primitive_list[current_primitive].color=
current_color;
primitive_list[current_primitive].x1=col;
@ -344,23 +368,28 @@ int create_using_boxes(void) {
fprintf(stderr,"Error! Too many primitives: %d\n",current_primitive);
exit(1);
}
/* mark the area we've drawn */
/* use 0xff to indicate */
for(yy=0;yy<box_sizes[box].y;yy++) {
for(xx=0;xx<box_sizes[box].x;xx++) {
if(framebuffer[xx+col][yy+row]==current_color) {
framebuffer[xx+col][yy+row]=0xff;
framebuffer[xx+col][yy+row]=0xff;
}
}
}
find_max_color_extent(current_color,
/* re-calculate max extent */
find_max_color_extent(current_color,
&color_minx,&color_miny,
&color_maxx,&color_maxy);
}
}
} // col
} // row
} // box
} // col
} // row
} // box
} // current_color
return current_primitive;
}