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Better handling of special case when scaling image
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Browse Source 
When scaling image down by 2, 4, 8, etc., there is no
sense in calling the bilinear scaling.
This commit is contained in:
Matthias Melcher
2025-07-01 13:22:09 +02:00
parent a34711daeb
commit 66dde26469
1 changed files with 14 additions and 6 deletions
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src/Fl_Image.cxx
+14 -6
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@@ -734,24 +734,32 @@ Fl_Image *Fl_RGB_Image::copy(int W, int H) const {
// much larger, divide it by two in either direction first. This is not
// perfect, but relatively fast.
const Fl_RGB_Image *img = this;
while ((img->data_w() > 2*W) || (img->data_h() > 2*H)) {
while ((img->data_w() >= 2*W) || (img->data_h() >= 2*H)) {
// Coarse scaling horizontally
if (img->data_w()>2*W) {
if (img->data_w()>=2*W) {
const Fl_RGB_Image *scaled_img = img->copy_scale_down_2h_();
if (img != this) delete img;
img = scaled_img;
}
// Coarse scaling vertically
if (img->data_h()>2*H) {
if (img->data_h()>=2*H) {
const Fl_RGB_Image *scaled_img = img->copy_scale_down_2v_();
if (img != this) delete img;
img = scaled_img;
}
}
// Fine scaling the smaller image
Fl_RGB_Image *fine_scaled_img = img->copy_bilinear_(W, H);
if (img != this) delete img;
return fine_scaled_img;
if ((img->data_w() != W) || (img->data_h() != H)) {
Fl_RGB_Image *fine_scaled_img = img->copy_bilinear_(W, H);
if (img != this) delete img;
return fine_scaled_img;
} else {
if (img == this) { // this should not happen, but just in case
return copy();
} else {
return (Fl_Image*)img;
}
}
}
}