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[c] Ported clipping fixes for colinear points (a0caef6 and 932c33a). See #2546.

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This commit is contained in:
Mario Zechner 2024-06-11 13:45:02 +02:00
parent f997a5f131
commit ac4ff96915
1 changed files with 40 additions and 45 deletions
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85
spine-c/spine-c/src/spine/SkeletonClipping.c
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@ -125,7 +125,6 @@ int /*boolean*/ spSkeletonClipping_isClipping(spSkeletonClipping *self) {
int /*boolean*/
_clip(spSkeletonClipping *self, float x1, float y1, float x2, float y2, float x3, float y3, spFloatArray *clippingArea,
spFloatArray *output) {
int i;
spFloatArray *originalOutput = output;
int clipped = 0;
float *clippingVertices;
@ -149,55 +148,51 @@ _clip(spSkeletonClipping *self, float x1, float y1, float x2, float y2, float x3
spFloatArray_add(input, y1);
spFloatArray_clear(output);
clippingVertices = clippingArea->items;
clippingVerticesLast = clippingArea->size - 4;
for (i = 0;; i += 2) {
int ii;
clippingVertices = clippingArea->items;
for (int i = 0;; i += 2) {
spFloatArray *temp;
float edgeX = clippingVertices[i], edgeY = clippingVertices[i + 1];
float edgeX2 = clippingVertices[i + 2], edgeY2 = clippingVertices[i + 3];
float deltaX = edgeX - edgeX2, deltaY = edgeY - edgeY2;
float ex = edgeX - clippingVertices[i + 2], ey = edgeY - clippingVertices[i + 3];
int outputStart = output->size;
float *inputVertices = input->items;
int inputVerticesLength = input->size - 2, outputStart = output->size;
for (ii = 0; ii < inputVerticesLength; ii += 2) {
float inputX = inputVertices[ii], inputY = inputVertices[ii + 1];
float inputX2 = inputVertices[ii + 2], inputY2 = inputVertices[ii + 3];
int side2 = deltaX * (inputY2 - edgeY2) - deltaY * (inputX2 - edgeX2) > 0;
if (deltaX * (inputY - edgeY2) - deltaY * (inputX - edgeX2) > 0) {
float c0, c2;
float s, ua;
if (side2) {
spFloatArray_add(output, inputX2);
spFloatArray_add(output, inputY2);
continue;
}
c0 = inputY2 - inputY, c2 = inputX2 - inputX;
s = c0 * (edgeX2 - edgeX) - c2 * (edgeY2 - edgeY);
if (ABS(s) > 0.000001f) {
ua = (c2 * (edgeY - inputY) - c0 * (edgeX - inputX)) / s;
spFloatArray_add(output, edgeX + (edgeX2 - edgeX) * ua);
spFloatArray_add(output, edgeY + (edgeY2 - edgeY) * ua);
} else {
spFloatArray_add(output, edgeX);
spFloatArray_add(output, edgeY);
}
} else if (side2) {
float c0 = inputY2 - inputY, c2 = inputX2 - inputX;
float s = c0 * (edgeX2 - edgeX) - c2 * (edgeY2 - edgeY);
if (ABS(s) > 0.000001f) {
float ua = (c2 * (edgeY - inputY) - c0 * (edgeX - inputX)) / s;
spFloatArray_add(output, edgeX + (edgeX2 - edgeX) * ua);
spFloatArray_add(output, edgeY + (edgeY2 - edgeY) * ua);
} else {
spFloatArray_add(output, edgeX);
spFloatArray_add(output, edgeY);
}
spFloatArray_add(output, inputX2);
spFloatArray_add(output, inputY2);
}
clipped = 1;
}
for (int ii = 0, nn = input->size - 2; ii < nn;) {
float inputX = inputVertices[ii], inputY = inputVertices[ii + 1];
ii += 2;
float inputX2 = inputVertices[ii], inputY2 = inputVertices[ii + 1];
float s2 = ey * (edgeX - inputX2) > ex * (edgeY - inputY2);
float s1 = ey * (edgeX - inputX) - ex * (edgeY - inputY);
if (s1 > 0) {
if (s2) { // v1 inside, v2 inside
spFloatArray_add(output, inputX2);
spFloatArray_add(output, inputY2);
continue;
}
// v1 inside, v2 outside
float ix = inputX2 - inputX, iy = inputY2 - inputY, t = s1 / (ix * ey - iy * ex);
if (t >= 0 && t <= 1) {
spFloatArray_add(output, inputX + ix * t);
spFloatArray_add(output, inputY + iy * t);
} else {
spFloatArray_add(output, inputX2);
spFloatArray_add(output, inputY2);
}
} else if (s2) { // v1 outside, v2 inside
float ix = inputX2 - inputX, iy = inputY2 - inputY, t = s1 / (ix * ey - iy * ex);
if (t >= 0 && t <= 1) {
spFloatArray_add(output, inputX + ix * t);
spFloatArray_add(output, inputY + iy * t);
spFloatArray_add(output, inputX2);
spFloatArray_add(output, inputY2);
} else {
spFloatArray_add(output, inputX2);
spFloatArray_add(output, inputY2);
continue;
}
}
clipped = -1;
}
if (outputStart == output->size) {
spFloatArray_clear(originalOutput);