90 lines
2.4 KiB
C++
90 lines
2.4 KiB
C++
#include "CanvasPixel.h"
|
|
|
|
#include <cstring>
|
|
|
|
CanvasPixel::CanvasPixel() {
|
|
count = 0;
|
|
composite = COLOR_BLACK;
|
|
}
|
|
|
|
const CanvasFragment *CanvasPixel::getFrontFragment() const {
|
|
if (count == 0) {
|
|
return nullptr;
|
|
} else {
|
|
return fragments + (count - 1);
|
|
}
|
|
}
|
|
|
|
void CanvasPixel::reset() {
|
|
count = 0;
|
|
composite = COLOR_BLACK;
|
|
}
|
|
|
|
void CanvasPixel::pushFragment(const CanvasFragment &fragment) {
|
|
if (count == 0) {
|
|
fragments[0] = fragment;
|
|
count = 1;
|
|
} else {
|
|
if (fragments[0].getOpaque() and fragment.getZ() <= fragments[0].getZ()) {
|
|
// behind opaque fragment, don't bother
|
|
return;
|
|
}
|
|
|
|
// find expected position
|
|
int i = 0;
|
|
while (i < count and fragment.getZ() >= fragments[i].getZ()) {
|
|
i++;
|
|
}
|
|
|
|
if (i > 0 and fragments[i - 1].getZ() == fragment.getZ() and
|
|
fragments[i - 1].getClient() == fragment.getClient()) {
|
|
// Pixel already pushed by same client, don't do anything
|
|
return;
|
|
}
|
|
|
|
if (fragment.getOpaque()) {
|
|
// Discard fragments masked by the incoming opaque one
|
|
if (i < count) {
|
|
memmove(fragments + 1, fragments + i, sizeof(CanvasFragment) * (count - i));
|
|
count -= i;
|
|
} else {
|
|
count = 1;
|
|
}
|
|
fragments[0] = fragment;
|
|
} else {
|
|
// Transparent pixel
|
|
if (i < count) {
|
|
// Need to make room for the incoming fragment
|
|
if (count < MAX_FRAGMENTS_PER_PIXEL) {
|
|
memmove(fragments + i + 1, fragments + i, sizeof(CanvasFragment) * (count - i));
|
|
fragments[i] = fragment;
|
|
count++;
|
|
}
|
|
} else {
|
|
if (count == MAX_FRAGMENTS_PER_PIXEL) {
|
|
// Replace nearest fragment
|
|
fragments[count - 1] = fragment;
|
|
} else {
|
|
// Append
|
|
fragments[count] = fragment;
|
|
count++;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
updateComposite();
|
|
}
|
|
|
|
void CanvasPixel::updateComposite() {
|
|
Color result(0.0, 0.0, 0.0, 1.0);
|
|
for (int i = 0; i < count; i++) {
|
|
result.mask(fragments[i].getColor());
|
|
}
|
|
composite = result;
|
|
}
|
|
|
|
void CanvasPixel::setComposite(const Color &color) {
|
|
composite = color;
|
|
}
|