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GUI: Implemented color dithering for background

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This commit is contained in:
Eugene Sandulenko 2011-12-09 12:13:42 +00:00
parent 75478959ab
commit 04d1c1d54b
1 changed files with 55 additions and 3 deletions
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58
graphics/VectorRendererSpec.cpp
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@ -252,6 +252,7 @@ fillSurface() {
byte *ptr = (byte *)_activeSurface->getBasePtr(0, 0);
int h = _activeSurface->h;
int w = _activeSurface->w;
int pitch = _activeSurface->pitch;
if (Base::_fillMode == kFillBackground) {
@ -259,9 +260,60 @@ fillSurface() {
} else if (Base::_fillMode == kFillForeground) {
colorFill<PixelType>((PixelType *)ptr, (PixelType *)(ptr + pitch * h), _fgColor);
} else if (Base::_fillMode == kFillGradient) {
int i = h;
while (i--) {
colorFill<PixelType>((PixelType *)ptr, (PixelType *)(ptr + pitch), calcGradient(h - i, h));
Common::Array<PixelType> gradCache;
Common::Array<int> gradIndexes;
PixelType prevcolor = 0, color;
int numColors = 0;
for (int i = 0; i < h + 2; i++) {
color = calcGradient(i, h);
if (color != prevcolor || i == 0 || i > h - 1) {
prevcolor = color;
gradCache.push_back(color);
gradIndexes.push_back(i);
numColors++;
}
}
int curGrad = -1;
for (int i = 0; i < h; i++) {
PixelType *ptr1 = (PixelType *)ptr;
bool ox = (i & 1 == 1);
int stripSize;
if (i == gradIndexes[curGrad + 1]) {
curGrad++;
stripSize = gradIndexes[curGrad + 1] - gradIndexes[curGrad];
}
int grad = (((i - gradIndexes[curGrad]) % stripSize) << 2) / stripSize;
// Dithering:
// +--+ +--+ +--+ +--+
// | | | | | *| | *|
// | | | *| |* | |**|
// +--+ +--+ +--+ +--+
// 0 1 2 3
if (grad == 0 ||
gradCache[curGrad] == gradCache[curGrad + 1] || // no color change
stripSize < 2) { // the stip is small
colorFill<PixelType>((PixelType *)ptr, (PixelType *)(ptr + pitch), gradCache[curGrad]);
} else if (grad == 3 && ox) {
colorFill<PixelType>((PixelType *)ptr, (PixelType *)(ptr + pitch), gradCache[curGrad + 1]);
} else {
for (int j = 0; j < w; j++, ptr1++) {
bool oy = (j & 1 == 1);
if ((ox && oy) ||
((grad == 2 || grad == 3) && ox && !oy) ||
(grad == 3 && oy))
*ptr1 = gradCache[curGrad + 1];
else
*ptr1 = gradCache[curGrad];
}
}
ptr += pitch;
}
}