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antialiassing: use the VDB to store the filtered result and flush it at once

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Kiss-Vamosi Gabor
2017-01-13 23:27:53 +01:00
parent 39af8d8252
commit 166fe70781
1 changed files with 36 additions and 25 deletions
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61
lv_obj/lv_vdb.c
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@@ -56,37 +56,48 @@ void lv_vdb_flush(void)
disp_area(DISP_ID_ALL, vdb.vdb_area.x1 , vdb.vdb_area.y1, vdb.vdb_area.x2, vdb.vdb_area.y2);
disp_map(DISP_ID_ALL, vdb.buf);
#else
color_t row_buf[LV_HOR_RES / LV_DOWNSCALE];
color_t * row_buf_p;
/* Get the average of 2x2 pixels and put the result back to the VDB
* The reading goes much faster then the write back
* so useful data won't be overwritten
* Example:
* -----------------------------
* in1_buf |2,2|6,8| 3,7
* in2_buf |4,4|7,7| 1,2
* --------- ==>
* in1_buf |1,1|1,3|
* in2_buf |1,1|1,3|
* */
cord_t x;
cord_t y;
cord_t w = area_get_width(&vdb.vdb_area);
cord_t i;
color_t * buf_p = vdb.buf;
for(y = vdb.vdb_area.y1 >> 1; y <= vdb.vdb_area.y2 >> 1; y ++) {
i = 0;
row_buf_p = row_buf;
for(x = vdb.vdb_area.x1; x < vdb.vdb_area.x2; x += 2, i += 2) {
row_buf_p->red = (buf_p[i].red +
buf_p[i + 1].red +
buf_p[i + w].red +
buf_p[i + w + 1].red) >> 2;
row_buf_p->green = (buf_p[i].green +
buf_p[i + 1].green +
buf_p[i + w].green +
buf_p[i + w + 1].green) >> 2;
row_buf_p->blue = (buf_p[i].blue +
buf_p[i + 1].blue +
buf_p[i + w].blue +
buf_p[i + w + 1].blue) >> 2;
color_t * in1_buf = vdb.buf; /*Pointer to the first row*/
color_t * in2_buf = vdb.buf + w; /*Pointer to the second row*/
color_t * out_buf = vdb.buf; /*Store the result here*/
for(y = vdb.vdb_area.y1; y < vdb.vdb_area.y2; y += 2) {
for(x = vdb.vdb_area.x1; x < vdb.vdb_area.x2; x += 2) {
/*Get the average of 2x2 red*/
out_buf->red = (in1_buf->red + (in1_buf + 1)->red +
in2_buf->red + (in2_buf+ 1)->red) >> 2;
/*Get the average of 2x2 green*/
out_buf->green = (in1_buf->green + (in1_buf + 1)->green +
in2_buf->green + (in2_buf + 1)->green) >> 2;
/*Get the average of 2x2 blue*/
out_buf->blue = (in1_buf->blue + (in1_buf + 1)->blue +
in2_buf->blue + (in2_buf + 1)->blue) >> 2;
row_buf_p++;
in1_buf+=2; /*Skip the next pixel because it is already used above*/
in2_buf+=2;
out_buf++;
}
/*2 row is ready so go the next 2*/
in1_buf += w; /*Skip the next row because it is processed from in2_buf*/
in2_buf += w;
}
buf_p += LV_DOWNSCALE * w;
disp_area(DISP_ID_ALL, vdb.vdb_area.x1 >> 1, y, vdb.vdb_area.x2 >> 1, y);
disp_map(DISP_ID_ALL, row_buf);
}
/* Now the full the VDB is filtered and the result is stored in the first quarter of it
* Write out the filtered map to the display*/
disp_area(DISP_ID_ALL, vdb.vdb_area.x1 >> 1, vdb.vdb_area.y1 >> 1, vdb.vdb_area.x2 >> 1, vdb.vdb_area.y2 >> 1);
disp_map(DISP_ID_ALL, vdb.buf);
#endif
}