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preround our fx fractional coordiante, so we get rounded integers (0..255) when

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stepping through the gradient.



git-svn-id: http://skia.googlecode.com/svn/trunk@212 2bbb7eff-a529-9590-31e7-b0007b416f81
This commit is contained in:
reed@android.com 2009-06-12 20:02:50 +00:00
parent b34086a37f
commit c552a43c7f
1 changed files with 11 additions and 21 deletions
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32
src/effects/SkGradientShader.cpp
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@ -662,31 +662,27 @@ void Linear_Gradient::shadeSpan(int x, int y, SkPMColor dstC[], int count)
TileProc proc = fTileProc;
const SkPMColor* cache = this->getCache32();
if (fDstToIndexClass != kPerspective_MatrixClass)
{
if (fDstToIndexClass != kPerspective_MatrixClass) {
dstProc(fDstToIndex, SkIntToScalar(x), SkIntToScalar(y), &srcPt);
SkFixed dx, fx = SkScalarToFixed(srcPt.fX);
// preround fx by half the amount we throw away
fx += 1 << 7;
if (fDstToIndexClass == kFixedStepInX_MatrixClass)
{
if (fDstToIndexClass == kFixedStepInX_MatrixClass) {
SkFixed dxStorage[1];
(void)fDstToIndex.fixedStepInX(SkIntToScalar(y), dxStorage, NULL);
dx = dxStorage[0];
}
else
{
} else {
SkASSERT(fDstToIndexClass == kLinear_MatrixClass);
dx = SkScalarToFixed(fDstToIndex.getScaleX());
}
if (SkFixedNearlyZero(dx)) // we're a vertical gradient, so no change in a span
{
if (SkFixedNearlyZero(dx)) {
// we're a vertical gradient, so no change in a span
unsigned fi = proc(fx);
SkASSERT(fi <= 0xFFFF);
sk_memset32(dstC, cache[fi >> (16 - kCache32Bits)], count);
}
else if (proc == clamp_tileproc)
{
} else if (proc == clamp_tileproc) {
#if 0
if (no_need_for_clamp(fx, dx, count))
{
@ -716,18 +712,14 @@ void Linear_Gradient::shadeSpan(int x, int y, SkPMColor dstC[], int count)
fx += dx;
*dstC++ = cache[fi];
} while (--count != 0);
}
else if (proc == mirror_tileproc)
{
} else if (proc == mirror_tileproc) {
do {
unsigned fi = mirror_8bits(fx >> 8);
SkASSERT(fi <= 0xFF);
fx += dx;
*dstC++ = cache[fi];
} while (--count != 0);
}
else
{
} else {
SkASSERT(proc == repeat_tileproc);
do {
unsigned fi = repeat_8bits(fx >> 8);
@ -736,9 +728,7 @@ void Linear_Gradient::shadeSpan(int x, int y, SkPMColor dstC[], int count)
*dstC++ = cache[fi];
} while (--count != 0);
}
}
else
{
} else {
SkScalar dstX = SkIntToScalar(x);
SkScalar dstY = SkIntToScalar(y);
do {