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Better solution to subzero clamping problem

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rdb 2010-10-31 13:32:35 +00:00
parent 44bf0582cf
commit 3a6e008f72
1 changed files with 14 additions and 32 deletions
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46
panda/src/pnmimage/pnmImage.cxx
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@ -1464,25 +1464,28 @@ operator += (const PNMImage &other) {
void PNMImage::
operator += (const Colord &other) {
size_t array_size = _x_size * _y_size;
xel addxel (to_val(other.get_x()), to_val(other.get_y()), to_val(other.get_z()));
xelval addalpha = to_val(other.get_w());
// Note: don't use to_val here because it clamps values below 0
int add_r = (int)(other.get_x() * get_maxval() + 0.5);
int add_g = (int)(other.get_y() * get_maxval() + 0.5);
int add_b = (int)(other.get_z() * get_maxval() + 0.5);
int add_a = (int)(other.get_w() * get_maxval() + 0.5);
if (_array != NULL && _alpha != NULL) {
for (size_t i = 0; i < array_size; ++i) {
_array[i].r = clamp_val(_array[i].r + addxel.r);
_array[i].g = clamp_val(_array[i].g + addxel.g);
_array[i].b = clamp_val(_array[i].b + addxel.b);
_alpha[i] = clamp_val(_alpha[i] + addalpha);
_array[i].r = clamp_val(_array[i].r + add_r);
_array[i].g = clamp_val(_array[i].g + add_g);
_array[i].b = clamp_val(_array[i].b + add_b);
_alpha[i] = clamp_val(_alpha[i] + add_a);
}
} else if (_array != NULL) {
for (size_t i = 0; i < array_size; ++i) {
_array[i].r = clamp_val(_array[i].r + addxel.r);
_array[i].g = clamp_val(_array[i].g + addxel.g);
_array[i].b = clamp_val(_array[i].b + addxel.b);
_array[i].r = clamp_val(_array[i].r + add_r);
_array[i].g = clamp_val(_array[i].g + add_g);
_array[i].b = clamp_val(_array[i].b + add_b);
}
} else if (_alpha != NULL) {
for (size_t i = 0; i < array_size; ++i) {
_alpha[i] = clamp_val(_alpha[i] + addalpha);
_alpha[i] = clamp_val(_alpha[i] + add_a);
}
}
}
@ -1529,28 +1532,7 @@ operator -= (const PNMImage &other) {
////////////////////////////////////////////////////////////////////
void PNMImage::
operator -= (const Colord &other) {
size_t array_size = _x_size * _y_size;
xel subxel (to_val(other.get_x()), to_val(other.get_y()), to_val(other.get_z()));
xelval subalpha = to_val(other.get_w());
if (_array != NULL && _alpha != NULL) {
for (size_t i = 0; i < array_size; ++i) {
_array[i].r = clamp_val(_array[i].r - subxel.r);
_array[i].g = clamp_val(_array[i].g - subxel.g);
_array[i].b = clamp_val(_array[i].b - subxel.b);
_alpha[i] = clamp_val(_alpha[i] + subalpha);
}
} else if (_array != NULL) {
for (size_t i = 0; i < array_size; ++i) {
_array[i].r = clamp_val(_array[i].r - subxel.r);
_array[i].g = clamp_val(_array[i].g - subxel.g);
_array[i].b = clamp_val(_array[i].b - subxel.b);
}
} else if (_alpha != NULL) {
for (size_t i = 0; i < array_size; ++i) {
_alpha[i] = clamp_val(_alpha[i] - subalpha);
}
}
(*this) += (-other);
}
////////////////////////////////////////////////////////////////////