pdfium / pdfium / 81683d4924b14869564198f832a20f46926cbad1 / . / third_party / libopenjpeg20 / sparse_array.h

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#include "opj_includes.h" | |

#ifndef OPJ_SPARSE_ARRAY_H | |

#define OPJ_SPARSE_ARRAY_H | |

/** | |

@file sparse_array.h | |

@brief Sparse array management | |

The functions in this file manage sparse arrays. Sparse arrays are arrays with | |

potential big dimensions, but with very few samples actually set. Such sparse | |

arrays require allocating a low amount of memory, by just allocating memory | |

for blocks of the array that are set. The minimum memory allocation unit is a | |

a block. There is a trade-off to pick up an appropriate dimension for blocks. | |

If it is too big, and pixels set are far from each other, too much memory will | |

be used. If blocks are too small, the book-keeping costs of blocks will raise. | |

*/ | |

/** @defgroup SPARSE_ARRAY SPARSE ARRAYS - Sparse arrays */ | |

/*@{*/ | |

/** Opaque type for sparse arrays that contain int32 values */ | |

typedef struct opj_sparse_array_int32 opj_sparse_array_int32_t; | |

/** Creates a new sparse array. | |

* @param width total width of the array. | |

* @param height total height of the array | |

* @param block_width width of a block. | |

* @param block_height height of a block. | |

* @return a new sparse array instance, or NULL in case of failure. | |

*/ | |

opj_sparse_array_int32_t* opj_sparse_array_int32_create(OPJ_UINT32 width, | |

OPJ_UINT32 height, | |

OPJ_UINT32 block_width, | |

OPJ_UINT32 block_height); | |

/** Frees a sparse array. | |

* @param sa sparse array instance. | |

*/ | |

void opj_sparse_array_int32_free(opj_sparse_array_int32_t* sa); | |

/** Returns whether region bounds are valid (non empty and within array bounds) | |

* @param sa sparse array instance. | |

* @param x0 left x coordinate of the region. | |

* @param y0 top x coordinate of the region. | |

* @param x1 right x coordinate (not included) of the region. Must be greater than x0. | |

* @param y1 bottom y coordinate (not included) of the region. Must be greater than y0. | |

* @return OPJ_TRUE or OPJ_FALSE. | |

*/ | |

OPJ_BOOL opj_sparse_array_is_region_valid(const opj_sparse_array_int32_t* sa, | |

OPJ_UINT32 x0, | |

OPJ_UINT32 y0, | |

OPJ_UINT32 x1, | |

OPJ_UINT32 y1); | |

/** Read the content of a rectangular region of the sparse array into a | |

* user buffer. | |

* | |

* Regions not written with opj_sparse_array_int32_write() are read as 0. | |

* | |

* @param sa sparse array instance. | |

* @param x0 left x coordinate of the region to read in the sparse array. | |

* @param y0 top x coordinate of the region to read in the sparse array. | |

* @param x1 right x coordinate (not included) of the region to read in the sparse array. Must be greater than x0. | |

* @param y1 bottom y coordinate (not included) of the region to read in the sparse array. Must be greater than y0. | |

* @param dest user buffer to fill. Must be at least sizeof(int32) * ( (y1 - y0 - 1) * dest_line_stride + (x1 - x0 - 1) * dest_col_stride + 1) bytes large. | |

* @param dest_col_stride spacing (in elements, not in bytes) in x dimension between consecutive elements of the user buffer. | |

* @param dest_line_stride spacing (in elements, not in bytes) in y dimension between consecutive elements of the user buffer. | |

* @param forgiving if set to TRUE and the region is invalid, OPJ_TRUE will still be returned. | |

* @return OPJ_TRUE in case of success. | |

*/ | |

OPJ_BOOL opj_sparse_array_int32_read(const opj_sparse_array_int32_t* sa, | |

OPJ_UINT32 x0, | |

OPJ_UINT32 y0, | |

OPJ_UINT32 x1, | |

OPJ_UINT32 y1, | |

OPJ_INT32* dest, | |

OPJ_UINT32 dest_col_stride, | |

OPJ_UINT32 dest_line_stride, | |

OPJ_BOOL forgiving); | |

/** Write the content of a rectangular region into the sparse array from a | |

* user buffer. | |

* | |

* Blocks intersecting the region are allocated, if not already done. | |

* | |

* @param sa sparse array instance. | |

* @param x0 left x coordinate of the region to write into the sparse array. | |

* @param y0 top x coordinate of the region to write into the sparse array. | |

* @param x1 right x coordinate (not included) of the region to write into the sparse array. Must be greater than x0. | |

* @param y1 bottom y coordinate (not included) of the region to write into the sparse array. Must be greater than y0. | |

* @param src user buffer to fill. Must be at least sizeof(int32) * ( (y1 - y0 - 1) * src_line_stride + (x1 - x0 - 1) * src_col_stride + 1) bytes large. | |

* @param src_col_stride spacing (in elements, not in bytes) in x dimension between consecutive elements of the user buffer. | |

* @param src_line_stride spacing (in elements, not in bytes) in y dimension between consecutive elements of the user buffer. | |

* @param forgiving if set to TRUE and the region is invalid, OPJ_TRUE will still be returned. | |

* @return OPJ_TRUE in case of success. | |

*/ | |

OPJ_BOOL opj_sparse_array_int32_write(opj_sparse_array_int32_t* sa, | |

OPJ_UINT32 x0, | |

OPJ_UINT32 y0, | |

OPJ_UINT32 x1, | |

OPJ_UINT32 y1, | |

const OPJ_INT32* src, | |

OPJ_UINT32 src_col_stride, | |

OPJ_UINT32 src_line_stride, | |

OPJ_BOOL forgiving); | |

/*@}*/ | |

#endif /* OPJ_SPARSE_ARRAY_H */ |