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pixel_step_iterator< IT > Class Template Reference
[Pixel Iterators]
Pixel iterator with dynamically specified step in bytes.
More...
#include <pixel_iterator.hpp>
Inherits adobe::step_iterator_adaptor< pixel_step_iterator< IT >, IT, byte_step_fn< IT > >.
Public Types | |
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typedef pixel_iterator_traits< IT >::channel_t | channel_t |
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typedef pixel_iterator_traits< IT >::color_space_t | color_space_t |
| typedef parent_t::difference_type | difference_type |
| typedef std::random_access_iterator_tag | iterator_category |
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typedef adobe::step_iterator_adaptor< pixel_step_iterator< IT >, IT, byte_step_fn< IT > > | parent_t |
| typedef parent_t::reference | reference |
| typedef IT | x_iterator |
Public Member Functions | |
| x_iterator const & | base () const |
| x_iterator & | base () |
| reference | operator[] (difference_type d) const |
| template<typename I2> | |
| pixel_step_iterator (const pixel_step_iterator< I2 > &it) | |
| pixel_step_iterator (IT it, std::ptrdiff_t byte_step) | |
| pixel_step_iterator () | |
| void | set_step (std::ptrdiff_t byte_step) |
Detailed Description
template<typename IT>
class pixel_step_iterator< IT >
Models PixelStepIteratorConceptA refinement of step_iterator_adaptor that uses a dynamic parameter for the step which is specified in bytes
Pixel step iterators are used to provide iteration over non-adjacent pixels. Common use is a vertical traversal, where the step is the row stride.
Another application is as a sub-channel view. For example, a red intensity image over interleaved RGB data would use a step iterator adaptor with step sizeof(channel_t)*3 In the latter example the step size could be fixed at compile time for efficiency. Compile-time fixed step can be implemented by providing A_FN that takes the step as a template
Definition at line 179 of file pixel_iterator.hpp.
Member Function Documentation
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For some reason operator[] provided by boost::iterator_adaptor returns a custom class that is convertible to reference We require our own reference because it is registered in iterator_traits Definition at line 198 of file pixel_iterator.hpp. |