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safer lut usage, prevent out of bounds

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niels
2025-11-03 20:32:48 +01:00
parent c6cedfb65e
commit 76efa7bbb8
1 changed files with 11 additions and 12 deletions
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23
veejay-current/veejay-server/libvje/effects/gradientfield.c
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@@ -425,7 +425,6 @@ void gradientfield_apply( void *ptr, VJFrame *frame, int *args ) {
const int hei1 = height - 1;
for (int y = 1; y < hei1; ++y) {
#pragma omp simd
for (int x = 1; x < wid1; ++x) {
const int index = y * width + x;
@@ -449,20 +448,20 @@ void gradientfield_apply( void *ptr, VJFrame *frame, int *args ) {
gx *= magnitudeScaling;
gy *= magnitudeScaling;
const int abs_gx = (gx ^ (gx >> 31)) - (gx >> 31);
const int abs_gy = (gy ^ (gy >> 31)) - (gy >> 31);
//const int abs_gx = (gx ^ (gx >> 31)) - (gx >> 31);
//const int abs_gy = (gy ^ (gy >> 31)) - (gy >> 31);
const int abs_gx = __builtin_abs(gx);
const int abs_gy = __builtin_abs(gy);
const int gradientMagnitudeSquared = gx * gx + gy * gy;
float direction = (abs_gx != 0) ? lut[(abs_gy << 8) / (abs_gx + 1)] + directionalBias: 0.0f;
//float direction = (abs_gx != 0) ? lut[(abs_gy << 8) / (abs_gx + 1)] + directionalBias: 0.0f;
int idx = (abs_gy << 8) / (abs_gx + 1);
idx &= -(idx < LUT_SIZE);
idx |= (idx >= LUT_SIZE) * (LUT_SIZE - 1);
float direction = lut[idx] + directionalBias;
/* if (gx < 0) {
direction = M_PI - direction;
}
if (direction < 0) {
direction += M_PI;
} */
direction += M_PI * (direction < 0 );
direction = direction + (M_PI - 2 * direction) * (gx < 0);
direction += M_PI * (direction < 0);
vectorField[x][y].mag = gradientMagnitudeSquared;
vectorField[x][y].dir = direction;