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Fix errors in color transforms.

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Add support for color offsets.
Add support for special swizzles that select default const values.
This commit is contained in:
castano
2008-06-30 10:59:57 +00:00
parent 206bfcf0f3
commit 756f12c994
6 changed files with 38 additions and 12 deletions
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11
src/nvimage/FloatImage.cpp
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@ -242,7 +242,7 @@ void FloatImage::exponentiate(uint base_component, uint num, float power)
}
/// Apply linear transform.
void FloatImage::transform(uint base_component, const Matrix & m)
void FloatImage::transform(uint base_component, const Matrix & m, Vector4::Arg offset)
{
nvCheck(base_component + 4 <= m_componentNum);
@ -255,7 +255,7 @@ void FloatImage::transform(uint base_component, const Matrix & m)
for (uint i = 0; i < size; i++)
{
Vector4 color = nv::transform(m, Vector4(*r, *g, *b, *a));
Vector4 color = nv::transform(m, Vector4(*r, *g, *b, *a)) + offset;
*r++ = color.x();
*g++ = color.y();
@ -267,14 +267,19 @@ void FloatImage::transform(uint base_component, const Matrix & m)
void FloatImage::swizzle(uint base_component, uint r, uint g, uint b, uint a)
{
nvCheck(base_component + 4 <= m_componentNum);
nvCheck(r < 7 && g < 7 && b < 7 && a < 7);
const uint size = m_width * m_height;
float * c[4];
float consts[] = { 1.0f, 0.0f, -1.0f };
float * c[7];
c[0] = this->channel(base_component + 0);
c[1] = this->channel(base_component + 1);
c[2] = this->channel(base_component + 2);
c[3] = this->channel(base_component + 3);
c[4] = consts;
c[5] = consts + 1;
c[6] = consts + 2;
for (uint i = 0; i < size; i++)
{

2
src/nvimage/FloatImage.h
View File

@ -63,7 +63,7 @@ public:
NVIMAGE_API void toGamma(uint base_component, uint num, float gamma = 2.2f);
NVIMAGE_API void exponentiate(uint base_component, uint num, float power);
NVIMAGE_API void transform(uint base_component, const Matrix & m);
NVIMAGE_API void transform(uint base_component, const Matrix & m, Vector4::Arg offset);
NVIMAGE_API void swizzle(uint base_component, uint r, uint g, uint b, uint a);
NVIMAGE_API FloatImage * fastDownSample() const;