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#ifndef _FB_H
#define _FB_H
#include <stdint.h>
#include <string.h>
#include <sys/types.h>
#include <xf86drmMode.h> /* for drmModeModeInfoPtr */
/* All renderers should target fb_fragment_t, which may or may not represent
* a full-screen mmap. Helpers are provided for subdividing fragments for
* concurrent renderers.
*/
typedef struct fb_fragment_t {
uint32_t *buf; /* pointer to the first pixel in the fragment */
unsigned x, y; /* absolute coordinates of the upper left corner of this fragment */
unsigned width, height; /* width and height of this fragment */
unsigned frame_width; /* width of the frame this fragment is part of */
unsigned frame_height; /* height of the frame this fragment is part of */
unsigned stride; /* number of bytes from the end of one row to the start of the next */
} fb_fragment_t;
/* This is a page handle object for page flip submission/life-cycle.
* Outside of fb_page_get()/fb_page_put(), you're going to be interested in
* fb_fragment_t. The fragment included here describes the whole page,
* it may be divided via fb_fragment_divide().
*/
typedef struct fb_page_t {
fb_fragment_t fragment;
} fb_page_t;
typedef struct fb_t fb_t;
fb_page_t * fb_page_get(fb_t *fb);
void fb_page_put(fb_t *fb, fb_page_t *page);
void fb_free(fb_t *fb);
void fb_get_put_pages_count(fb_t *fb, unsigned *count);
fb_t * fb_new(int drm_fd, uint32_t crtc_id, uint32_t *connectors, int n_connectors, drmModeModeInfoPtr mode, int n_pages);
void fb_fragment_divide(fb_fragment_t *fragment, unsigned n_fragments, fb_fragment_t fragments[]);
/* checks if a coordinate is contained within a fragment */
static inline int fb_fragment_contains(fb_fragment_t *fragment, int x, int y)
{
if (x < fragment->x || x >= fragment->x + fragment->width ||
y < fragment->y || y >= fragment->y + fragment->height)
return 0;
return 1;
}
/* puts a pixel into the fragment, no bounds checking is performed. */
static inline void fb_fragment_put_pixel_unchecked(fb_fragment_t *fragment, int x, int y, uint32_t pixel)
{
uint32_t *pixels = fragment->buf;
/* FIXME this assumes stride is aligned to 4 */
pixels[(y * (fragment->width + (fragment->stride >> 2))) + x] = pixel;
}
/* puts a pixel into the fragment, bounds checking is performed with a draw performed return status */
static inline int fb_fragment_put_pixel_checked(fb_fragment_t *fragment, int x, int y, uint32_t pixel)
{
if (!fb_fragment_contains(fragment, x, y))
return 0;
fb_fragment_put_pixel_unchecked(fragment, x, y, pixel);
return 1;
}
/* zero a fragment */
static inline void fb_fragment_zero(fb_fragment_t *fragment)
{
memset(fragment->buf, 0, ((fragment->width << 2) + fragment->stride) * fragment->height);
}
#endif
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