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Added Image::FlipHorizontally and Image::FlipVertically

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This commit is contained in:
Laurent Gomila 2011-07-29 22:04:59 +02:00
parent e509f01180
commit f5294d5342
2 changed files with 57 additions and 0 deletions
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12
include/SFML/Graphics/Image.hpp
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@ -252,6 +252,18 @@ public :
////////////////////////////////////////////////////////////
const Uint8* GetPixelsPtr() const;
////////////////////////////////////////////////////////////
/// \brief Flip the image horizontally (left <-> right)
///
////////////////////////////////////////////////////////////
void FlipHorizontally();
////////////////////////////////////////////////////////////
/// \brief Flip the image vertically (top <-> bottom)
///
////////////////////////////////////////////////////////////
void FlipVertically();
private :
////////////////////////////////////////////////////////////

45
src/SFML/Graphics/Image.cpp
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@ -263,4 +263,49 @@ const Uint8* Image::GetPixelsPtr() const
}
}
////////////////////////////////////////////////////////////
void Image::FlipHorizontally()
{
if (!myPixels.empty())
{
std::vector<Uint8> before = myPixels;
for (unsigned int y = 0; y < myHeight; ++y)
{
const Uint8* source = &before[y * myWidth * 4];
Uint8* dest = &myPixels[(y + 1) * myWidth * 4 - 4];
for (unsigned int x = 0; x < myWidth; ++x)
{
dest[0] = source[0];
dest[1] = source[1];
dest[2] = source[2];
dest[3] = source[3];
source += 4;
dest -= 4;
}
}
}
}
////////////////////////////////////////////////////////////
void Image::FlipVertically()
{
if (!myPixels.empty())
{
std::vector<Uint8> before = myPixels;
const Uint8* source = &before[myWidth * (myHeight - 1) * 4];
Uint8* dest = &myPixels[0];
std::size_t rowSize = myWidth * 4;
for (unsigned int y = 0; y < myHeight; ++y)
{
std::memcpy(dest, source, rowSize);
source -= rowSize;
dest += rowSize;
}
}
}
} // namespace sf