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allow set_alpha to handle values > 1.0

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GenevensiS
2026-04-24 15:27:21 +02:00
parent 0baa73ae7d
commit 72724a35c7
1 changed files with 25 additions and 10 deletions
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src/gfx/blend_image.cpp
+24 -9
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@@ -142,15 +142,30 @@ void set_alpha(Image& img, Byte* al, const wxSize& alpha_size) {
}
void set_alpha(Image& img, double alpha) {
Byte b_alpha = Byte(alpha * 255);
if (!img.HasAlpha()) {
img.InitAlpha();
memset(img.GetAlpha(), b_alpha, img.GetWidth() * img.GetHeight());
} else {
Byte *im = img.GetAlpha();
size_t size = img.GetWidth() * img.GetHeight();
for (size_t i = 0 ; i < size ; ++i) {
im[i] = (im[i] * b_alpha) / 255;
size_t size = img.GetWidth() * img.GetHeight();
if (alpha <= 0.0) {
if (!img.HasAlpha()) img.InitAlpha();
memset(img.GetAlpha(), Byte(0), size);
}
else if (alpha > 1.0) {
if (!img.HasAlpha()) return;
else {
Byte *im = img.GetAlpha();
for (size_t i = 0 ; i < size ; ++i) {
im[i] = Byte(min(im[i] * alpha, 255.0));
}
}
}
else {
Byte b_alpha = Byte(alpha * 255);
if (!img.HasAlpha()) {
img.InitAlpha();
memset(img.GetAlpha(), b_alpha, size);
} else {
Byte *im = img.GetAlpha();
for (size_t i = 0 ; i < size ; ++i) {
im[i] = (im[i] * b_alpha) / 255;
}
}
}
}