pixman_region32_init（）的实现在哪里？

Question

lib：http://www.pixman.org/

存储库：https://cgit.freedesktop.org/pixman/tree/

void pixman_region32_init（pixman_region32_t * region）;

我找不到该功能的实现..

感谢...

Answer 1

可以在pixman / pixman.h（pixman-0.34.0）中找到

ypedef struct pixman_region32_data     pixman_region32_data_t;
typedef struct pixman_box32             pixman_box32_t;
typedef struct pixman_rectangle32       pixman_rectangle32_t;
typedef struct pixman_region32          pixman_region32_t;

struct pixman_region32_data {
    long                size;
    long                numRects;
/*  pixman_box32_t      rects[size];   in memory but not explicitly declared */
};

struct pixman_rectangle32
{
    int32_t x, y;
    uint32_t width, height;
};

struct pixman_box32
{
    int32_t x1, y1, x2, y2;
};

struct pixman_region32
{
    pixman_box32_t          extents;
    pixman_region32_data_t  *data;
};

Answer 2

它在pixman-region32.c中。您看不到它，因为这些函数是由PREFIX宏生成的，然后使用了pixman-region.c中的代码。看到这里：

typedef pixman_box32_t      box_type_t;
typedef pixman_region32_data_t  region_data_type_t;
typedef pixman_region32_t   region_type_t;
typedef int64_t                 overflow_int_t;

typedef struct {
    int x, y;
} point_type_t;

#define PREFIX(x) pixman_region32##x

#define PIXMAN_REGION_MAX INT32_MAX
#define PIXMAN_REGION_MIN INT32_MIN

#include "pixman-region.c"

它首先将PREFIX宏设置为pixman_region32，然后从pixman-region.c导入代码。