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lv_vdb: add comments

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This commit is contained in:
Gabor Kiss-Vamosi 2018-12-29 09:18:58 +01:00
parent 31468efc8e
commit d7ae21ce85
2 changed files with 14 additions and 6 deletions
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14
lv_core/lv_vdb.c
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@ -108,12 +108,6 @@ void lv_vdb_flush(void)
lv_disp_flush(vdb_act->area.x1, vdb_act->area.y1, vdb_act->area.x2, vdb_act->area.y2, vdb_act->buf);
#if LV_VDB_TRUE_DOUBLE_BUFFERED
while(vdb_flushing);
memcpy(vdb[(vdb_active + 1) & 0x1].buf, vdb[vdb_active].buf, LV_VDB_SIZE_IN_BYTES);
#endif
#if LV_VDB_DOUBLE
/*Make the other VDB active. The content of the current will be kept until the next flush*/
vdb_active++;
@ -124,6 +118,14 @@ void lv_vdb_flush(void)
memset(vdb[vdb_active].buf, 0x00, LV_VDB_SIZE_IN_BYTES);
# endif /*LV_COLOR_SCREEN_TRANSP*/
/* With true double buffering the flushing should be only the address change of the current frame buffer
* Wait until the address change is ready and copy the active content to the other frame buffer (new active VDB)
* The changes will be written to the new VDB.*/
#if LV_VDB_TRUE_DOUBLE_BUFFERED
while(vdb_flushing);
memcpy(vdb[vdb_active].buf, vdb[(vdb_active + 1) & 0x1].buf, LV_VDB_SIZE_IN_BYTES);
#endif
#endif /*#if LV_VDB_DOUBLE*/
}

6
lv_core/lv_vdb.h
View File

@ -35,6 +35,12 @@ extern "C" {
#define LV_VDB_PX_BPP LV_COLOR_SIZE
#endif
#if LV_VDB_TRUE_DOUBLE_BUFFERED && (LV_VDB_SIZE != LV_HOR_RES * LV_VER_RES || LV_VDB_DOUBLE == 0)
#error "With LV_VDB_TRUE_DOUBLE_BUFFERED: (LV_VDB_SIZE = LV_HOR_RES * LV_VER_RES and LV_VDB_DOUBLE = 1 is required"
#endif
/* The size of VDB in bytes.
* (LV_VDB_SIZE * LV_VDB_PX_BPP) >> 3): just divide by 8 to convert bits to bytes
* (((LV_VDB_SIZE * LV_VDB_PX_BPP) & 0x7) ? 1 : 0): add an extra byte to round up.