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Fix of Grayish problem. TP#4094

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Sigurd Pettersen pointed out that the legend texture has to be a power of two high, that is four, and not tree.
Some simpler OGL drivers will scale the texture to power of two behind the scenes, and the texture will not be clean anymore resulting in addressing it "between colors".
p4#: 22323
This commit is contained in:
Jacob Støren
2013-09-06 09:44:57 +02:00
parent 97bb848b1d
commit a73b412235
1 changed files with 2 additions and 1 deletions
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3
CommonCode/cafEffectGenerator.cpp
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@@ -483,7 +483,7 @@ ScalarMapperEffectGenerator::addAlphaAndUndefStripes(const cvf::TextureImage* te
CVF_ASSERT(texImg->height() == 1);
cvf::ref<cvf::TextureImage> modTexImg = new cvf::TextureImage;
modTexImg->allocate(texImg->width(), texImg->height() + 2);
modTexImg->allocate(texImg->width(), texImg->height() + 3); // Make the texture a power of two to avoid behind the scenes scaling and the following artefacts
modTexImg->fill(cvf::Color4ub(cvf::Color3ub(undefScalarColor), 255)); // Undefined color
for (cvf::uint i = 0 ; i < texImg->width(); ++i)
@@ -492,6 +492,7 @@ ScalarMapperEffectGenerator::addAlphaAndUndefStripes(const cvf::TextureImage* te
modTexImg->setPixel(i, 0, legendColor);
legendColor.a() = static_cast<cvf::ubyte>(opacityLevel * 255);
modTexImg->setPixel(i, 1, legendColor);
modTexImg->setPixel(i, 2, legendColor);
}
return modTexImg;