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Added saturate script function (+documentation), it also desaturates

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git-svn-id: svn://svn.code.sf.net/p/magicseteditor/code/trunk@800 0fc631ac-6414-0410-93d0-97cfa31319b6
This commit is contained in:
twanvl
2007-12-30 00:48:39 +00:00
parent 3ceec52c1c
commit 796975bd9d
11 changed files with 114 additions and 54 deletions
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src/gfx/image_effects.cpp
+30 -25
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@@ -12,33 +12,38 @@
// ----------------------------------------------------------------------------- : Saturation
void saturate(Image& image, int amount) {
void saturate(Image& image, double amount) {
if (amount == 0) return; // nothing to do
int factor = 300 / amount;
int div = factor - 2;
// for each pixel...
Byte* pix = image.GetData();
Byte* end = pix + image.GetWidth() * image.GetHeight() * 3;
while (pix != end) {
int r = pix[0], g = pix[1], b = pix[2];
int r2 = (factor * r - g - b) / div;
int g2 = (factor * g - r - b) / div;
int b2 = (factor * b - r - g) / div;
pix[0] = col(r2);
pix[1] = col(g2);
pix[2] = col(b2);
pix += 3;
}
}
void desaturate(Image& image/*, int amount*/) {
Byte* pix = image.GetData();
Byte* end = pix + image.GetWidth() * image.GetHeight() * 3;
while (pix != end) {
int r = pix[0], g = pix[1], b = pix[2];
pix[0] = (r+r+g+b) / 4;
pix[1] = (g+r+g+b) / 4;
pix[2] = (b+r+g+b) / 4;
pix += 3;
if (amount > 0) {
amount = min(amount,0.99);
int factor = 256 * amount;
int div = 768 - 3 * factor;
while (pix != end) {
int r = pix[0], g = pix[1], b = pix[2];
int avg = factor*(r+g+b);
pix[0] = col((768*r - avg) / div);
pix[1] = col((768*g - avg) / div);
pix[2] = col((768*b - avg) / div);
pix += 3;
}
} else if (amount < -0.99) {
while (pix != end) {
int r = pix[0], g = pix[1], b = pix[2];
pix[0] = pix[1] = pix[2] = (r+g+b)/3;
pix += 3;
}
} else {
int factor1 = 256 * -amount;
int factor2 = 768 - 3*factor1;
while (pix != end) {
int r = pix[0], g = pix[1], b = pix[2];
int avg = factor1*(r+g+b);
pix[0] = (factor2*r + avg) / 768;
pix[1] = (factor2*g + avg) / 768;
pix[2] = (factor2*b + avg) / 768;
pix += 3;
}
}
}