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59 rivejä
1.7 KiB
59 rivejä
1.7 KiB
This is a working document. It list the places where pixels are mangled and requested functions to do it in an colorstrategy independent way
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The purpose is to find out which functions an API in colorstrategy must have to support pixelmangling in a colorstretegy independent manner.
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Requested function: apply an alpha mask to pixels
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Problem: alpha is hard-coded 8-bit in KisPixel, when it should be free
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void KisPaintDevice::clearSelection()
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{
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if (!hasSelection()) return;
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QRect r = m_selection -> selectedRect();
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r = r.normalize();
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for (Q_INT32 y = 0; y < r.height(); y++) {
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KisHLineIterator devIt = createHLineIterator(r.x(), r.y() + y, r.width(), true);
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KisHLineIterator selectionIt = m_selection -> createHLineIterator(r.x(), r.y() + y, r.width(), false);
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while (!devIt.isDone()) {
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KisPixel p = toPixel(devIt.rawData());
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KisPixel s = m_selection -> toPixel(selectionIt.rawData());
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// XXX: Why Q_UIN16 here? Doesn't that clash with UINT8_MULT later on?
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Q_UINT16 p_alpha, s_alpha;
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p_alpha = p.alpha();
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s_alpha = MAX_SELECTED - s.alpha();
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p.alpha() = UINT8_MULT(p_alpha, s_alpha);
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++devIt;
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++selectionIt;
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}
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}
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}
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void KisPaintDevice::applySelectionMask(KisSelectionSP mask)
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{
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QRect r = mask -> extent();
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crop(r);
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for (Q_INT32 y = r.top(); y <= r.bottom(); ++y) {
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KisHLineIterator pixelIt = createHLineIterator(r.x(), y, r.width(), true);
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KisHLineIterator maskIt = mask -> createHLineIterator(r.x(), y, r.width(), false);
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while (!pixelIt.isDone()) {
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KisPixel pixel = toPixel(pixelIt.rawData());
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KisPixel maskValue = mask -> toPixel(maskIt.rawData());
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pixel.alpha() = (pixel.alpha() * maskValue.alpha()) / MAX_SELECTED;
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++pixelIt;
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++maskIt;
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}
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}
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}
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