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https://github.com/lvgl/lvgl.git
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117 lines
3.2 KiB
C
117 lines
3.2 KiB
C
/**
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* @file lv_vdb.c
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*
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*/
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#include "lv_conf.h"
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#if LV_VDB_SIZE != 0
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#include "hal/disp/disp.h"
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#include <stddef.h>
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#include "lv_vdb.h"
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/*********************
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* INCLUDES
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*********************/
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/*********************
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* DEFINES
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*********************/
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/**********************
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* TYPEDEFS
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**********************/
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/**********************
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* STATIC PROTOTYPES
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**********************/
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/**********************
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* STATIC VARIABLES
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**********************/
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static lv_vdb_t vdb;
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/**********************
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* MACROS
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**********************/
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/**********************
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* GLOBAL FUNCTIONS
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**********************/
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/**
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* Get the vdb variable
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* @return pointer to the vdb variable
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*/
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lv_vdb_t * lv_vdb_get(void)
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{
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return &vdb;
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}
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/**
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* Flush the content of the vdb
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*/
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void lv_vdb_flush(void)
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{
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#if LV_ANTIALIAS == 0
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disp_area(DISP_ID_ALL, vdb.vdb_area.x1 , vdb.vdb_area.y1, vdb.vdb_area.x2, vdb.vdb_area.y2);
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disp_map(DISP_ID_ALL, vdb.buf);
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#else
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/* Get the average of 2x2 pixels and put the result back to the VDB
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* The reading goes much faster then the write back
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* so useful data won't be overwritten
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* Example:
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* -----------------------------
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* in1_buf |2,2|6,8| 3,7
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* in2_buf |4,4|7,7| 1,2
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* --------- ==>
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* in1_buf |1,1|1,3|
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* in2_buf |1,1|1,3|
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* */
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cord_t x;
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cord_t y;
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cord_t w = area_get_width(&vdb.vdb_area);
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color_t * in1_buf = vdb.buf; /*Pointer to the first row*/
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color_t * in2_buf = vdb.buf + w; /*Pointer to the second row*/
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color_t * out_buf = vdb.buf; /*Store the result here*/
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for(y = vdb.vdb_area.y1; y < vdb.vdb_area.y2; y += 2) {
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for(x = vdb.vdb_area.x1; x < vdb.vdb_area.x2; x += 2) {
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/*If the pixels are the same do not calculate the average */
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if(in1_buf->full == (in1_buf + 1)->full &&
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in1_buf->full == in2_buf->full &&
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in1_buf->full == (in2_buf + 1)->full) {
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out_buf->full = in1_buf->full;
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} else {
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/*Get the average of 2x2 red*/
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out_buf->red = (in1_buf->red + (in1_buf + 1)->red +
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in2_buf->red + (in2_buf+ 1)->red) >> 2;
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/*Get the average of 2x2 green*/
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out_buf->green = (in1_buf->green + (in1_buf + 1)->green +
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in2_buf->green + (in2_buf + 1)->green) >> 2;
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/*Get the average of 2x2 blue*/
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out_buf->blue = (in1_buf->blue + (in1_buf + 1)->blue +
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in2_buf->blue + (in2_buf + 1)->blue) >> 2;
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}
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in1_buf += 2; /*Skip the next pixel because it is already used above*/
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in2_buf += 2;
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out_buf ++;
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}
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/*2 row is ready so go the next 2*/
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in1_buf += w; /*Skip the next row because it is processed from in2_buf*/
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in2_buf += w;
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}
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/* Now the full the VDB is filtered and the result is stored in the first quarter of it
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* Write out the filtered map to the display*/
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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);
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disp_map(DISP_ID_ALL, vdb.buf);
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#endif
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}
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/**********************
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* STATIC FUNCTIONS
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**********************/
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#endif
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