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/**
* @file lv_qrcode.c
*
*/
/*********************
* INCLUDES
*********************/
#include "../../lvgl.h"
#if LV_USE_QRCODE
#include "qrcodegen.h"
/*********************
* DEFINES
*********************/
#define MY_CLASS (&lv_qrcode_class)
/**********************
* TYPEDEFS
**********************/
/**********************
* STATIC PROTOTYPES
**********************/
static void lv_qrcode_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj);
static void lv_qrcode_destructor(const lv_obj_class_t * class_p, lv_obj_t * obj);
/**********************
* STATIC VARIABLES
**********************/
const lv_obj_class_t lv_qrcode_class = {
.constructor_cb = lv_qrcode_constructor,
.destructor_cb = lv_qrcode_destructor,
.instance_size = sizeof(lv_qrcode_t),
.base_class = &lv_canvas_class,
.name = "qrcode",
};
/**********************
* MACROS
**********************/
/**********************
* GLOBAL FUNCTIONS
**********************/
lv_obj_t * lv_qrcode_create(lv_obj_t * parent)
{
LV_LOG_INFO("begin");
lv_obj_t * obj = lv_obj_class_create_obj(MY_CLASS, parent);
lv_obj_class_init_obj(obj);
return obj;
}
void lv_qrcode_set_size(lv_obj_t * obj, int32_t size)
{
LV_ASSERT_OBJ(obj, MY_CLASS);
lv_draw_buf_t * old_buf = lv_canvas_get_draw_buf(obj);
lv_draw_buf_t * new_buf = lv_draw_buf_create(size, size, LV_COLOR_FORMAT_I1, LV_STRIDE_AUTO);
if(new_buf == NULL) {
LV_LOG_ERROR("malloc failed for canvas buffer");
return;
}
lv_canvas_set_draw_buf(obj, new_buf);
LV_LOG_INFO("set canvas buffer: %p, size = %d", (void *)new_buf, (int)size);
/*Clear canvas buffer*/
lv_canvas_fill_bg(obj, lv_color_white(), LV_OPA_COVER);
if(old_buf != NULL) lv_draw_buf_destroy(old_buf);
}
void lv_qrcode_set_dark_color(lv_obj_t * obj, lv_color_t color)
{
LV_ASSERT_OBJ(obj, MY_CLASS);
lv_qrcode_t * qrcode = (lv_qrcode_t *)obj;
qrcode->dark_color = color;
}
void lv_qrcode_set_light_color(lv_obj_t * obj, lv_color_t color)
{
LV_ASSERT_OBJ(obj, MY_CLASS);
lv_qrcode_t * qrcode = (lv_qrcode_t *)obj;
qrcode->light_color = color;
}
lv_result_t lv_qrcode_update(lv_obj_t * obj, const void * data, uint32_t data_len)
{
LV_ASSERT_OBJ(obj, MY_CLASS);
lv_qrcode_t * qrcode = (lv_qrcode_t *)obj;
lv_draw_buf_t * draw_buf = lv_canvas_get_draw_buf(obj);
if(draw_buf == NULL) {
LV_LOG_ERROR("canvas draw buffer is NULL");
return LV_RESULT_INVALID;
}
lv_canvas_set_palette(obj, 0, lv_color_to_32(qrcode->dark_color, 0xff));
lv_canvas_set_palette(obj, 1, lv_color_to_32(qrcode->light_color, 0xff));
lv_color_t c = lv_color_hex(1);
lv_canvas_fill_bg(obj, c, LV_OPA_COVER);
if(data_len > qrcodegen_BUFFER_LEN_MAX) return LV_RESULT_INVALID;
int32_t qr_version = qrcodegen_getMinFitVersion(qrcodegen_Ecc_MEDIUM, data_len);
if(qr_version <= 0) return LV_RESULT_INVALID;
int32_t qr_size = qrcodegen_version2size(qr_version);
if(qr_size <= 0) return LV_RESULT_INVALID;
int32_t scale = draw_buf->header.w / qr_size;
if(scale <= 0) return LV_RESULT_INVALID;
/* Pick the largest QR code that still maintains scale. */
for(int32_t i = qr_version + 1; i < qrcodegen_VERSION_MAX; i++) {
if(qrcodegen_version2size(i) * scale > draw_buf->header.w)
break;
qr_version = i;
}
qr_size = qrcodegen_version2size(qr_version);
uint8_t * qr0 = lv_malloc(qrcodegen_BUFFER_LEN_FOR_VERSION(qr_version));
LV_ASSERT_MALLOC(qr0);
uint8_t * data_tmp = lv_malloc(qrcodegen_BUFFER_LEN_FOR_VERSION(qr_version));
LV_ASSERT_MALLOC(data_tmp);
lv_memcpy(data_tmp, data, data_len);
bool ok = qrcodegen_encodeBinary(data_tmp, data_len,
qr0, qrcodegen_Ecc_MEDIUM,
qr_version, qr_version,
qrcodegen_Mask_AUTO, true);
if(!ok) {
lv_free(qr0);
lv_free(data_tmp);
return LV_RESULT_INVALID;
}
int32_t obj_w = draw_buf->header.w;
qr_size = qrcodegen_getSize(qr0);
scale = obj_w / qr_size;
int scaled = qr_size * scale;
int margin = (obj_w - scaled) / 2;
uint8_t * buf_u8 = (uint8_t *)draw_buf->data + 8; /*+8 skip the palette*/
/* Copy the qr code canvas:
* A simple `lv_canvas_set_px` would work but it's slow for so many pixels.
* So buffer 1 byte (8 px) from the qr code and set it in the canvas image */
uint32_t row_byte_cnt = draw_buf->header.stride;
int y;
for(y = margin; y < scaled + margin; y += scale) {
uint8_t b = 0;
uint8_t p = 0;
bool aligned = false;
int x;
for(x = margin; x < scaled + margin; x++) {
bool a = qrcodegen_getModule(qr0, (x - margin) / scale, (y - margin) / scale);
if(aligned == false && (x & 0x7) == 0) aligned = true;
if(aligned == false) {
c = lv_color_hex(a ? 0 : 1);
lv_canvas_set_px(obj, x, y, c, LV_OPA_COVER);
}
else {
if(!a) b |= (1 << (7 - p));
p++;
if(p == 8) {
uint32_t px = row_byte_cnt * y + (x >> 3);
buf_u8[px] = b;
b = 0;
p = 0;
}
}
}
/*Process the last byte of the row*/
if(p) {
/*Make the rest of the bits white*/
b |= (1 << (8 - p)) - 1;
uint32_t px = row_byte_cnt * y + (x >> 3);
buf_u8[px] = b;
}
/*The Qr is probably scaled so simply to the repeated rows*/
int s;
const uint8_t * row_ori = buf_u8 + row_byte_cnt * y;
for(s = 1; s < scale; s++) {
lv_memcpy((uint8_t *)buf_u8 + row_byte_cnt * (y + s), row_ori, row_byte_cnt);
}
}
lv_free(qr0);
lv_free(data_tmp);
return LV_RESULT_OK;
}
/**********************
* STATIC FUNCTIONS
**********************/
static void lv_qrcode_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj)
{
LV_UNUSED(class_p);
/*Set default size*/
lv_qrcode_set_size(obj, LV_DPI_DEF);
/*Set default color*/
lv_qrcode_set_dark_color(obj, lv_color_black());
lv_qrcode_set_light_color(obj, lv_color_white());
}
static void lv_qrcode_destructor(const lv_obj_class_t * class_p, lv_obj_t * obj)
{
LV_UNUSED(class_p);
lv_draw_buf_t * draw_buf = lv_canvas_get_draw_buf(obj);
if(draw_buf == NULL) return;
lv_image_cache_drop(draw_buf);
/*@fixme destroy buffer in cache free_cb.*/
lv_draw_buf_destroy(draw_buf);
}
#endif /*LV_USE_QRCODE*/
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