void Spectrum::fromSRGB(Float r, Float g, Float b) {
r = fromSRGBComponent(r);
g = fromSRGBComponent(g);
b = fromSRGBComponent(b);
fromLinearRGB(r, g, b);
}
void initializeFrom(Bitmap *bitmap) {
ref<Bitmap> corrected;
m_bpp = bitmap->getBitsPerPixel();
if (bitmap->getBitsPerPixel() == 128) {
/* Nothing needs to be done */
corrected = bitmap;
} else {
corrected = new Bitmap(bitmap->getWidth(), bitmap->getHeight(), 128);
float tbl[256];
if (m_gamma == -1) {
for (int i=0; i<256; ++i)
tbl[i] = fromSRGBComponent((Float) i / (Float) 255);
} else {
for (int i=0; i<256; ++i)
tbl[i] = std::pow((Float) i / (Float) 255, m_gamma);
}
uint8_t *data = bitmap->getData();
float *flData = corrected->getFloatData();
if (bitmap->getBitsPerPixel() == 32) {
for (int y=0; y<bitmap->getHeight(); ++y) {
for (int x=0; x<bitmap->getWidth(); ++x) {
float
r = tbl[*data++],
g = tbl[*data++],
b = tbl[*data++],
a = *data++ / 255.0f;
*flData++ = r;
*flData++ = g;
*flData++ = b;
*flData++ = a;
}
}
} else if (bitmap->getBitsPerPixel() == 24) {
for (int y=0; y<bitmap->getHeight(); ++y) {
for (int x=0; x<bitmap->getWidth(); ++x) {
float
r = tbl[*data++],
g = tbl[*data++],
b = tbl[*data++];
*flData++ = r;
*flData++ = g;
*flData++ = b;
*flData++ = 1.0f;
}
}
} else if (bitmap->getBitsPerPixel() == 16) {
for (int y=0; y<bitmap->getHeight(); ++y) {
for (int x=0; x<bitmap->getWidth(); ++x) {
float col = tbl[*data++],
a = *data++ / 255.0f;
*flData++ = col;
*flData++ = col;
*flData++ = col;
*flData++ = a;
}
}
} else if (bitmap->getBitsPerPixel() == 8) {
for (int y=0; y<bitmap->getHeight(); ++y) {
for (int x=0; x<bitmap->getWidth(); ++x) {
float col = tbl[*data++];
*flData++ = col;
*flData++ = col;
*flData++ = col;
*flData++ = 1.0f;
}
}
} else if (bitmap->getBitsPerPixel() == 1) {
int pos = 0;
for (int y=0; y<bitmap->getHeight(); ++y) {
for (int x=0; x<bitmap->getWidth(); ++x) {
int entry = pos / 8;
int bit = pos % 8;
int value = (data[entry] & (1 << bit)) ? 255 : 0;
float col = tbl[value];
*flData++ = col;
*flData++ = col;
*flData++ = col;
*flData++ = 1.0f;
pos++;
}
}
} else {
Log(EError, "%i bpp images are currently not supported!", bitmap->getBitsPerPixel());
}
}
m_mipmap = MIPMap::fromBitmap(corrected, m_filterType,
m_wrapMode, m_maxAnisotropy);
}
