diff --git a/include/SFML/Graphics/Image.hpp b/include/SFML/Graphics/Image.hpp index c1a80acf..77213494 100644 --- a/include/SFML/Graphics/Image.hpp +++ b/include/SFML/Graphics/Image.hpp @@ -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 : //////////////////////////////////////////////////////////// diff --git a/src/SFML/Graphics/Image.cpp b/src/SFML/Graphics/Image.cpp index 851a38dc..cba01247 100644 --- a/src/SFML/Graphics/Image.cpp +++ b/src/SFML/Graphics/Image.cpp @@ -263,4 +263,49 @@ const Uint8* Image::GetPixelsPtr() const } } + +//////////////////////////////////////////////////////////// +void Image::FlipHorizontally() +{ + if (!myPixels.empty()) + { + std::vector 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 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