void KImage::setPixel(const KPoint &p, const KColor &color) {
if(surface == nullptr) {
return;
}
if(p.x >= surface->w || p.y >= surface->h || p.x < 0 || p.y < 0) {
return;
}
uint8_t *pixel = (uint8_t *)surface->pixels;
pixel += p.y * surface->pitch;
pixel += p.x * surface->format->BytesPerPixel;
uint32_t *pixel32 = (uint32_t *)pixel;
*pixel32 = colorToUInt(color);
}
void KImage::fillRect(const KRect &rect, const KColor &color) {
SDL_Rect r = KRectTOSDLRect(rect);
if(surface != nullptr) {
SDL_FillRect(surface, &r, colorToUInt(color));
}
}
void KImage::drawLine(const KPoint &p1, const KPoint &p2, const KColor &color) {
if(surface == nullptr) {
return;
}
KPoint p = p1;
int dx = abs(p2.x - p1.x);
int dy = abs(p2.y - p1.y);
int sx = p1.x < p2.x ? 1 : -1;
int sy = p1.y < p2.y ? 1 : -1;
int e = (dx > dy ? dx : -dy) / 2;
int e2;
int c = dx > dy ? dx : dy;
if(p.x >= surface->w || p.y >= surface->h || p.x < 0 || p.y < 0) {
// Line starts out of bounds of image. iterate till it's in bounds.
while(c >= 0) {
c--;
e2 = e;
if(e2 > -dx) {
// Move horizontally.
e -= dy;
p.x += sx;
}
if(e2 < dy) {
// Move vertically.
e += dx;
p.y += sy;
}
if(p.x < surface->w && p.y < surface->h && p.x >= 0 && p.y >= 0) {
// We are now in bounds.
break;
}
}
}
int bpp = surface->format->BytesPerPixel;
int ptch = surface->pitch;
uint8_t *pixel = (uint8_t *)surface->pixels;
pixel += p.y * ptch;
pixel += p.x * bpp;
// pre multiply so this is only once.
bpp *= sx;
ptch *= sy;
while(c >= 0) {
c--;
uint32_t *pixel32 = (uint32_t *)pixel;
*pixel32 = colorToUInt(color);
e2 = e;
if(e2 > -dx) {
// Move horizontally.
e -= dy;
p.x += sx;
// Are we still in bounds?
if(p.x >= surface->w || p.x < 0) {
// We have gone out of bounds, no need to continue.
break;
}
pixel += bpp;
}
if(e2 < dy) {
// Move vertically.
e += dx;
p.y += sy;
// Are we still in bounds?
if(p.y >= surface->h || p.y < 0) {
// We have gone out of bounds, no need to continue.
break;
}
pixel += ptch;
}
}
}
//draws an empty box onto the surface
void Surface::box(const SDL_Color color, SDL_Rect *rect, int thickness){
box(colorToUInt(color), rect, thickness);
}
//fills a part of the surface with color
void Surface::fill(const SDL_Color color, SDL_Rect *rect){
fill(colorToUInt(color), rect);
}
