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/**
* @file lv_bmp.c
*
*/
/*********************
* INCLUDES
*********************/
#include "../../../lvgl.h"
#if LV_USE_BMP
#include <string.h>
/*********************
* DEFINES
*********************/
/**********************
* TYPEDEFS
**********************/
typedef struct {
lv_fs_file_t f;
unsigned int px_offset;
int px_width;
int px_height;
unsigned int bpp;
int row_size_bytes;
} bmp_dsc_t;
/**********************
* STATIC PROTOTYPES
**********************/
static lv_result_t decoder_info(lv_image_decoder_t * decoder, const void * src, lv_image_header_t * header);
static lv_result_t decoder_open(lv_image_decoder_t * decoder, lv_image_decoder_dsc_t * dsc);
static lv_result_t decoder_get_area(lv_image_decoder_t * decoder, lv_image_decoder_dsc_t * dsc,
const lv_area_t * full_area, lv_area_t * decoded_area);
static void decoder_close(lv_image_decoder_t * dec, lv_image_decoder_dsc_t * dsc);
/**********************
* STATIC VARIABLES
**********************/
/**********************
* MACROS
**********************/
/**********************
* GLOBAL FUNCTIONS
**********************/
void lv_bmp_init(void)
{
lv_image_decoder_t * dec = lv_image_decoder_create();
lv_image_decoder_set_info_cb(dec, decoder_info);
lv_image_decoder_set_open_cb(dec, decoder_open);
lv_image_decoder_set_get_area_cb(dec, decoder_get_area);
lv_image_decoder_set_close_cb(dec, decoder_close);
}
void lv_bmp_deinit(void)
{
lv_image_decoder_t * dec = NULL;
while((dec = lv_image_decoder_get_next(dec)) != NULL) {
if(dec->info_cb == decoder_info) {
lv_image_decoder_delete(dec);
break;
}
}
}
/**********************
* STATIC FUNCTIONS
**********************/
/**
* Get info about a BMP image
* @param src can be file name or pointer to a C array
* @param header store the info here
* @return LV_RESULT_OK: no error; LV_RESULT_INVALID: can't get the info
*/
static lv_result_t decoder_info(lv_image_decoder_t * decoder, const void * src, lv_image_header_t * header)
{
LV_UNUSED(decoder);
lv_image_src_t src_type = lv_image_src_get_type(src); /*Get the source type*/
/*If it's a BMP file...*/
if(src_type == LV_IMAGE_SRC_FILE) {
const char * fn = src;
if(lv_strcmp(lv_fs_get_ext(fn), "bmp") == 0) { /*Check the extension*/
/*Save the data in the header*/
lv_fs_file_t f;
lv_fs_res_t res = lv_fs_open(&f, src, LV_FS_MODE_RD);
if(res != LV_FS_RES_OK) return LV_RESULT_INVALID;
uint8_t headers[54];
lv_fs_read(&f, headers, 54, NULL);
uint32_t w;
uint32_t h;
lv_memcpy(&w, headers + 18, 4);
lv_memcpy(&h, headers + 22, 4);
header->w = w;
header->h = h;
lv_fs_close(&f);
uint16_t bpp;
lv_memcpy(&bpp, headers + 28, 2);
switch(bpp) {
case 16:
header->cf = LV_COLOR_FORMAT_RGB565;
break;
case 24:
header->cf = LV_COLOR_FORMAT_RGB888;
break;
case 32:
header->cf = LV_COLOR_FORMAT_ARGB8888;
break;
default:
LV_LOG_WARN("Not supported bpp: %d", bpp);
return LV_RESULT_OK;
}
return LV_RESULT_OK;
}
}
/* BMP file as data not supported for simplicity.
* Convert them to LVGL compatible C arrays directly. */
else if(src_type == LV_IMAGE_SRC_VARIABLE) {
return LV_RESULT_INVALID;
}
return LV_RESULT_INVALID; /*If didn't succeeded earlier then it's an error*/
}
/**
* Open a BMP image and return the decided image
* @param decoder pointer to the decoder
* @param dsc pointer to the decoder descriptor
* @return LV_RESULT_OK: no error; LV_RESULT_INVALID: can't open the image
*/
static lv_result_t decoder_open(lv_image_decoder_t * decoder, lv_image_decoder_dsc_t * dsc)
{
LV_UNUSED(decoder);
/*If it's a BMP file...*/
if(dsc->src_type == LV_IMAGE_SRC_FILE) {
const char * fn = dsc->src;
if(lv_strcmp(lv_fs_get_ext(fn), "bmp") != 0) {
return LV_RESULT_INVALID; /*Check the extension*/
}
bmp_dsc_t b;
lv_memset(&b, 0x00, sizeof(b));
lv_fs_res_t res = lv_fs_open(&b.f, dsc->src, LV_FS_MODE_RD);
if(res == LV_RESULT_OK) return LV_RESULT_INVALID;
uint8_t header[54];
lv_fs_read(&b.f, header, 54, NULL);
if(0x42 != header[0] || 0x4d != header[1]) {
lv_fs_close(&b.f);
return LV_RESULT_INVALID;
}
lv_memcpy(&b.px_offset, header + 10, 4);
lv_memcpy(&b.px_width, header + 18, 4);
lv_memcpy(&b.px_height, header + 22, 4);
lv_memcpy(&b.bpp, header + 28, 2);
b.row_size_bytes = ((b.bpp * b.px_width + 31) / 32) * 4;
dsc->user_data = lv_malloc(sizeof(bmp_dsc_t));
LV_ASSERT_MALLOC(dsc->user_data);
if(dsc->user_data == NULL) return LV_RESULT_INVALID;
lv_memcpy(dsc->user_data, &b, sizeof(b));
return LV_RESULT_OK;
}
/* BMP file as data not supported for simplicity.
* Convert them to LVGL compatible C arrays directly. */
else if(dsc->src_type == LV_IMAGE_SRC_VARIABLE) {
return LV_RESULT_INVALID;
}
return LV_RESULT_INVALID; /*If not returned earlier then it failed*/
}
static lv_result_t decoder_get_area(lv_image_decoder_t * decoder, lv_image_decoder_dsc_t * dsc,
const lv_area_t * full_area, lv_area_t * decoded_area)
{
LV_UNUSED(decoder);
bmp_dsc_t * b = dsc->user_data;
lv_draw_buf_t * decoded = (void *)dsc->decoded;
if(decoded_area->y1 == LV_COORD_MIN) {
*decoded_area = *full_area;
decoded_area->y2 = decoded_area->y1;
if(decoded == NULL) decoded = lv_draw_buf_create(lv_area_get_width(full_area), 1, dsc->header.cf, LV_STRIDE_AUTO);
dsc->decoded = decoded;
}
else {
decoded_area->y1++;
decoded_area->y2++;
}
if(decoded_area->y1 > full_area->y2) {
return LV_RESULT_INVALID;
}
else {
int32_t y = (b->px_height - 1) - (decoded_area->y1); /*BMP images are stored upside down*/
uint32_t p = b->px_offset + b->row_size_bytes * y;
p += (decoded_area->x1) * (b->bpp / 8);
lv_fs_seek(&b->f, p, LV_FS_SEEK_SET);
uint32_t line_width_byte = lv_area_get_width(full_area) * (b->bpp / 8);
lv_fs_read(&b->f, decoded->data, line_width_byte, NULL);
return LV_RESULT_OK;
}
}
/**
* Free the allocated resources
*/
static void decoder_close(lv_image_decoder_t * decoder, lv_image_decoder_dsc_t * dsc)
{
LV_UNUSED(decoder);
bmp_dsc_t * b = dsc->user_data;
lv_fs_close(&b->f);
lv_free(dsc->user_data);
if(dsc->decoded) lv_draw_buf_destroy((void *)dsc->decoded);
}
#endif /*LV_USE_BMP*/
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