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hekate/bdk/libs/lvgl/lv_draw/lv_draw_img.c
CTCaer 185526d134 Introducing Bootloader Development Kit (BDK) 
BDK will allow developers to use the full collection of drivers,
with limited editing, if any, for making payloads for Nintendo Switch.

Using a single source for everything will also help decoupling
Switch specific code and easily port it to other Tegra X1/X1+ platforms.
And maybe even to lower targets.

Everything is now centrilized into bdk folder.
Every module or project can utilize it by simply including it.

This is just the start and it will continue to improve.
2020-06-14 15:25:21 +03:00

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/**
* @file lv_draw_img.c
*
*/
/*********************
* INCLUDES
*********************/
#include "lv_draw_img.h"
#include "../lv_misc/lv_fs.h"
/*********************
* DEFINES
*********************/
/**********************
* TYPEDEFS
**********************/
/**********************
* STATIC PROTOTYPES
**********************/
static lv_res_t lv_img_draw_core(const lv_area_t * coords, const lv_area_t * mask,
const void * src, const lv_style_t * style, lv_opa_t opa_scale);
static const uint8_t * lv_img_decoder_open(const void * src, const lv_style_t * style);
static lv_res_t lv_img_decoder_read_line(lv_coord_t x, lv_coord_t y, lv_coord_t len, uint8_t * buf);
static void lv_img_decoder_close(void);
static lv_res_t lv_img_built_in_decoder_line_alpha(lv_coord_t x, lv_coord_t y, lv_coord_t len, uint8_t * buf);
static lv_res_t lv_img_built_in_decoder_line_indexed(lv_coord_t x, lv_coord_t y, lv_coord_t len, uint8_t * buf);
/**********************
* STATIC VARIABLES
**********************/
static bool decoder_custom;
static const void * decoder_src;
static lv_img_src_t decoder_src_type;
static lv_img_header_t decoder_header;
static const lv_style_t * decoder_style;
#if USE_LV_FILESYSTEM
static lv_fs_file_t decoder_file;
#endif
#if LV_IMG_CF_INDEXED
static lv_color_t decoder_index_map[256];
#endif
static lv_img_decoder_info_f_t lv_img_decoder_info_custom;
static lv_img_decoder_open_f_t lv_img_decoder_open_custom;
static lv_img_decoder_read_line_f_t lv_img_decoder_read_line_custom;
static lv_img_decoder_close_f_t lv_img_decoder_close_custom;
/**********************
* MACROS
**********************/
/**********************
* GLOBAL FUNCTIONS
**********************/
/**
* Draw an image
* @param coords the coordinates of the image
* @param mask the image will be drawn only in this area
* @param src pointer to a lv_color_t array which contains the pixels of the image
* @param style style of the image
* @param opa_scale scale down all opacities by the factor
*/
void lv_draw_img(const lv_area_t * coords, const lv_area_t * mask,
const void * src, const lv_style_t * style, lv_opa_t opa_scale)
{
if(src == NULL) {
LV_LOG_WARN("Image draw: src is NULL");
lv_draw_rect(coords, mask, &lv_style_plain, LV_OPA_COVER);
lv_draw_label(coords, mask, &lv_style_plain, LV_OPA_COVER, "No\ndata", LV_TXT_FLAG_NONE, NULL);
return;
}
lv_res_t res;
res = lv_img_draw_core(coords, mask, src, style, opa_scale);
if(res == LV_RES_INV) {
LV_LOG_WARN("Image draw error");
lv_draw_rect(coords, mask, &lv_style_plain, LV_OPA_COVER);
lv_draw_label(coords, mask, &lv_style_plain, LV_OPA_COVER, "No\ndata", LV_TXT_FLAG_NONE, NULL);
return;
}
}
/**
*
* @param src
* @param header
* @param style
* @return
*/
lv_res_t lv_img_dsc_get_info(const char * src, lv_img_header_t * header)
{
header->always_zero = 0;
/*Try to get info with the custom functions first*/
if(lv_img_decoder_info_custom) {
lv_res_t custom_res;
custom_res = lv_img_decoder_info_custom(src, header);
if(custom_res == LV_RES_OK) return LV_RES_OK; /*Custom info has supported this source*/
}
lv_img_src_t src_type = lv_img_src_get_type(src);
if(src_type == LV_IMG_SRC_VARIABLE) {
header->w = ((lv_img_dsc_t *)src)->header.w;
header->h = ((lv_img_dsc_t *)src)->header.h;
header->cf = ((lv_img_dsc_t *)src)->header.cf;
}
#if USE_LV_FILESYSTEM
else if(src_type == LV_IMG_SRC_FILE) {
lv_fs_file_t file;
lv_fs_res_t res;
uint32_t rn;
res = lv_fs_open(&file, src, LV_FS_MODE_RD);
if(res == LV_FS_RES_OK) {
res = lv_fs_read(&file, header, sizeof(lv_img_header_t), &rn);
}
/*Create a dummy header on fs error*/
if(res != LV_FS_RES_OK || rn != sizeof(lv_img_header_t)) {
header->w = LV_DPI;
header->h = LV_DPI;
header->cf = LV_IMG_CF_UNKOWN;
}
lv_fs_close(&file);
}
#endif
else if(src_type == LV_IMG_SRC_SYMBOL) {
/*The size depend on the font but it is unknown here. It should be handled outside of the function*/
header->w = 1;
header->h = 1;
/* Symbols always have transparent parts. Important because of cover check in the design function.
* The actual value doesn't matter because lv_draw_label will draw it*/
header->cf = LV_IMG_CF_ALPHA_1BIT;
} else {
LV_LOG_WARN("Image get info found unknown src type");
return false;
}
return true;
}
uint8_t lv_img_color_format_get_px_size(lv_img_cf_t cf)
{
uint8_t px_size = 0;
switch(cf) {
case LV_IMG_CF_UNKOWN:
case LV_IMG_CF_RAW:
px_size = 0;
break;
case LV_IMG_CF_TRUE_COLOR:
case LV_IMG_CF_TRUE_COLOR_CHROMA_KEYED:
px_size = LV_COLOR_SIZE;
break;
case LV_IMG_CF_TRUE_COLOR_ALPHA:
px_size = LV_IMG_PX_SIZE_ALPHA_BYTE << 3;
break;
case LV_IMG_CF_INDEXED_1BIT:
case LV_IMG_CF_ALPHA_1BIT:
px_size = 1;
break;
case LV_IMG_CF_INDEXED_2BIT:
case LV_IMG_CF_ALPHA_2BIT:
px_size = 2;
break;
case LV_IMG_CF_INDEXED_4BIT:
case LV_IMG_CF_ALPHA_4BIT:
px_size = 4;
break;
case LV_IMG_CF_INDEXED_8BIT:
case LV_IMG_CF_ALPHA_8BIT:
px_size = 8;
break;
default:
px_size = 0;
break;
}
return px_size;
}
bool lv_img_color_format_is_chroma_keyed(lv_img_cf_t cf)
{
bool is_chroma_keyed = false;
switch(cf) {
case LV_IMG_CF_TRUE_COLOR_CHROMA_KEYED:
case LV_IMG_CF_RAW_CHROMA_KEYED:
case LV_IMG_CF_INDEXED_1BIT:
case LV_IMG_CF_INDEXED_2BIT:
case LV_IMG_CF_INDEXED_4BIT:
case LV_IMG_CF_INDEXED_8BIT:
is_chroma_keyed = true;
break;
default:
is_chroma_keyed = false;
break;
}
return is_chroma_keyed;
}
bool lv_img_color_format_has_alpha(lv_img_cf_t cf)
{
bool has_alpha = false;
switch(cf) {
case LV_IMG_CF_TRUE_COLOR_ALPHA:
case LV_IMG_CF_RAW_ALPHA:
case LV_IMG_CF_ALPHA_1BIT:
case LV_IMG_CF_ALPHA_2BIT:
case LV_IMG_CF_ALPHA_4BIT:
case LV_IMG_CF_ALPHA_8BIT:
has_alpha = true;
break;
default:
has_alpha = false;
break;
}
return has_alpha;
}
/**
* Get the type of an image source
* @param src pointer to an image source:
* - pointer to an 'lv_img_t' variable (image stored internally and compiled into the code)
* - a path to a file (e.g. "S:/folder/image.bin")
* - or a symbol (e.g. SYMBOL_CLOSE)
* @return type of the image source LV_IMG_SRC_VARIABLE/FILE/SYMBOL/UNKOWN
*/
lv_img_src_t lv_img_src_get_type(const void * src)
{
lv_img_src_t img_src_type = LV_IMG_SRC_UNKNOWN;
if(src == NULL) return img_src_type;
const uint8_t * u8_p = src;
/*The first byte shows the type of the image source*/
if(u8_p[0] >= 0x20 && u8_p[0] <= 0x7F) {
img_src_type = LV_IMG_SRC_FILE; /*If it's an ASCII character then it's file name*/
} else if(u8_p[0] >= 0x80) {
img_src_type = LV_IMG_SRC_SYMBOL; /*Symbols begins after 0x7F*/
} else {
img_src_type = LV_IMG_SRC_VARIABLE; /*`lv_img_dsc_t` is design to the first byte < 0x20*/
}
if (LV_IMG_SRC_UNKNOWN == img_src_type) {
LV_LOG_WARN("lv_img_src_get_type: unknown image type");
}
return img_src_type;
}
/**
* Set custom decoder functions. See the typdefs of the function typed above for more info about them
* @param info_fp info get function
* @param open_fp open function
* @param read_fp read line function
* @param close_fp clode function
*/
void lv_img_decoder_set_custom(lv_img_decoder_info_f_t info_fp, lv_img_decoder_open_f_t open_fp,
lv_img_decoder_read_line_f_t read_fp, lv_img_decoder_close_f_t close_fp)
{
lv_img_decoder_info_custom = info_fp;
lv_img_decoder_open_custom = open_fp;
lv_img_decoder_read_line_custom = read_fp;
lv_img_decoder_close_custom = close_fp;
}
/**********************
* STATIC FUNCTIONS
**********************/
static lv_res_t lv_img_draw_core(const lv_area_t * coords, const lv_area_t * mask,
const void * src, const lv_style_t * style, lv_opa_t opa_scale)
{
lv_area_t mask_com; /*Common area of mask and coords*/
bool union_ok;
union_ok = lv_area_intersect(&mask_com, mask, coords);
if(union_ok == false) {
return LV_RES_OK; /*Out of mask. There is nothing to draw so the image is drawn successfully.*/
}
lv_opa_t opa = opa_scale == LV_OPA_COVER ? style->image.opa : (uint16_t)((uint16_t) style->image.opa * opa_scale) >> 8;
lv_img_header_t header;
lv_res_t header_res;
header_res = lv_img_dsc_get_info(src, &header);
if(header_res != LV_RES_OK) {
LV_LOG_WARN("Image draw can't get image info");
lv_img_decoder_close();
return LV_RES_INV;
}
bool chroma_keyed = lv_img_color_format_is_chroma_keyed(header.cf);
bool alpha_byte = lv_img_color_format_has_alpha(header.cf);
const uint8_t * img_data = lv_img_decoder_open(src, style);
if(img_data == LV_IMG_DECODER_OPEN_FAIL) {
LV_LOG_WARN("Image draw cannot open the image resource");
lv_img_decoder_close();
return LV_RES_INV;
}
/* The decoder open could open the image and gave the entire uncompressed image.
* Just draw it!*/
if(img_data) {
map_fp(coords, mask, img_data, opa, chroma_keyed, alpha_byte, style->image.color, style->image.intense);
}
/* The whole uncompressed image is not available. Try to read it line-by-line*/
else {
lv_coord_t width = lv_area_get_width(&mask_com);
#if LV_COMPILER_VLA_SUPPORTED
uint8_t buf[(lv_area_get_width(&mask_com) * ((LV_COLOR_DEPTH >> 3) + 1))];
#else
uint8_t buf[LV_HOR_RES * ((LV_COLOR_DEPTH >> 3) + 1)]; /*+1 because of the possible alpha byte*/
#endif
lv_area_t line;
lv_area_copy(&line, &mask_com);
lv_area_set_height(&line, 1);
lv_coord_t x = mask_com.x1 - coords->x1;
lv_coord_t y = mask_com.y1 - coords->y1;
lv_coord_t row;
lv_res_t read_res;
for(row = mask_com.y1; row <= mask_com.y2; row++) {
read_res = lv_img_decoder_read_line(x, y, width, buf);
if(read_res != LV_RES_OK) {
lv_img_decoder_close();
LV_LOG_WARN("Image draw can't read the line");
return LV_RES_INV;
}
map_fp(&line, mask, buf, opa, chroma_keyed, alpha_byte, style->image.color, style->image.intense);
line.y1++;
line.y2++;
y++;
}
}
lv_img_decoder_close();
return LV_RES_OK;
}
static const uint8_t * lv_img_decoder_open(const void * src, const lv_style_t * style)
{
decoder_custom = false;
/*Try to open with the custom functions first*/
if(lv_img_decoder_open_custom) {
const uint8_t * custom_res;
custom_res = lv_img_decoder_open_custom(src, style);
if(custom_res != LV_IMG_DECODER_OPEN_FAIL) {
decoder_custom = true; /*Mark that custom decoder function should be used for this img source.*/
return custom_res; /*Custom open supported this source*/
}
}
decoder_src = src;
decoder_style = style;
decoder_src_type = lv_img_src_get_type(src);
lv_res_t header_res;
header_res = lv_img_dsc_get_info(src, &decoder_header);
if(header_res == LV_RES_INV) {
decoder_src = NULL;
decoder_src_type = LV_IMG_SRC_UNKNOWN;
LV_LOG_WARN("Built-in image decoder can't get the header info");
return LV_IMG_DECODER_OPEN_FAIL;
}
/*Open the file if it's a file*/
if(decoder_src_type == LV_IMG_SRC_FILE) {
#if USE_LV_FILESYSTEM
lv_fs_res_t res = lv_fs_open(&decoder_file, src, LV_FS_MODE_RD);
if(res != LV_FS_RES_OK) {
LV_LOG_WARN("Built-in image decoder can't open the file");
return LV_IMG_DECODER_OPEN_FAIL;
}
#else
LV_LOG_WARN("Image built-in decoder can read file because USE_LV_FILESYSTEM = 0");
return LV_IMG_DECODER_OPEN_FAIL;
#endif
}
/*Process the different color formats*/
lv_img_cf_t cf = decoder_header.cf;
if(cf == LV_IMG_CF_TRUE_COLOR ||
cf == LV_IMG_CF_TRUE_COLOR_ALPHA ||
cf == LV_IMG_CF_TRUE_COLOR_CHROMA_KEYED) {
if(decoder_src_type == LV_IMG_SRC_VARIABLE) {
/*In case of uncompressed formats if the image stored in the ROM/RAM simply give it's pointer*/
return ((lv_img_dsc_t *)decoder_src)->data;
} else {
/*If it's file it need to be read line by line later*/
return NULL;
}
} else if(cf == LV_IMG_CF_INDEXED_1BIT ||
cf == LV_IMG_CF_INDEXED_2BIT ||
cf == LV_IMG_CF_INDEXED_4BIT ||
cf == LV_IMG_CF_INDEXED_8BIT) {
#if LV_IMG_CF_INDEXED
#if USE_LV_FILESYSTEM
lv_color32_t palette_file[256];
#endif
lv_color32_t * palette_p = NULL;
uint8_t px_size = lv_img_color_format_get_px_size(cf);
uint32_t palette_size = 1 << px_size;
if(decoder_src_type == LV_IMG_SRC_FILE) {
/*Read the palette from file*/
#if USE_LV_FILESYSTEM
lv_fs_seek(&decoder_file, 4); /*Skip the header*/
lv_fs_read(&decoder_file, palette_file, palette_size * sizeof(lv_color32_t), NULL);
palette_p = palette_file;
#else
LV_LOG_WARN("Image built-in decoder can read the palette because USE_LV_FILESYSTEM = 0");
return LV_IMG_DECODER_OPEN_FAIL;
#endif
} else {
/*The palette begins in the beginning of the image data. Just point to it.*/
palette_p = (lv_color32_t *)((lv_img_dsc_t *)decoder_src)->data;
}
uint32_t i;
for(i = 0; i < palette_size; i++) {
decoder_index_map[i] = LV_COLOR_MAKE(palette_p[i].red, palette_p[i].green, palette_p[i].blue);
}
return NULL;
#else
LV_LOG_WARN("Indexed (palette) images are not enabled in lv_conf.h. See LV_IMG_CF_INDEXED");
return LV_IMG_DECODER_OPEN_FAIL;
#endif
} else if(cf == LV_IMG_CF_ALPHA_1BIT ||
cf == LV_IMG_CF_ALPHA_2BIT ||
cf == LV_IMG_CF_ALPHA_4BIT ||
cf == LV_IMG_CF_ALPHA_8BIT) {
#if LV_IMG_CF_ALPHA
return NULL; /*Nothing to process*/
#else
LV_LOG_WARN("Alpha indexed images are not enabled in lv_conf.h. See LV_IMG_CF_ALPHA");
return LV_IMG_DECODER_OPEN_FAIL;
#endif
} else {
LV_LOG_WARN("Image decoder open: unknown color format")
return LV_IMG_DECODER_OPEN_FAIL;
}
}
static lv_res_t lv_img_decoder_read_line(lv_coord_t x, lv_coord_t y, lv_coord_t len, uint8_t * buf)
{
/*Try to read the line with the custom functions*/
if(decoder_custom) {
if(lv_img_decoder_read_line_custom) {
lv_res_t custom_res;
custom_res = lv_img_decoder_read_line_custom(x, y, len, buf);
return custom_res;
} else {
LV_LOG_WARN("Image open with custom decoder but read not supported")
}
return LV_RES_INV; /*It"s an error if not returned earlier*/
}
if(decoder_src_type == LV_IMG_SRC_FILE) {
#if USE_LV_FILESYSTEM
uint8_t px_size = lv_img_color_format_get_px_size(decoder_header.cf);
lv_fs_res_t res;
if(decoder_header.cf == LV_IMG_CF_TRUE_COLOR ||
decoder_header.cf == LV_IMG_CF_TRUE_COLOR_ALPHA ||
decoder_header.cf == LV_IMG_CF_TRUE_COLOR_CHROMA_KEYED) {
uint32_t pos = ((y * decoder_header.w + x) * px_size) >> 3;
pos += 4; /*Skip the header*/
res = lv_fs_seek(&decoder_file, pos);
if(res != LV_FS_RES_OK) {
LV_LOG_WARN("Built-in image decoder seek failed");
return false;
}
uint32_t btr = len * (px_size >> 3);
uint32_t br = 0;
lv_fs_read(&decoder_file, buf, btr, &br);
if(res != LV_FS_RES_OK || btr != br) {
LV_LOG_WARN("Built-in image decoder read failed");
return false;
}
} else if(decoder_header.cf == LV_IMG_CF_ALPHA_1BIT ||
decoder_header.cf == LV_IMG_CF_ALPHA_2BIT ||
decoder_header.cf == LV_IMG_CF_ALPHA_4BIT ||
decoder_header.cf == LV_IMG_CF_ALPHA_8BIT) {
lv_img_built_in_decoder_line_alpha(x, y, len, buf);
} else if(decoder_header.cf == LV_IMG_CF_INDEXED_1BIT ||
decoder_header.cf == LV_IMG_CF_INDEXED_2BIT ||
decoder_header.cf == LV_IMG_CF_INDEXED_4BIT ||
decoder_header.cf == LV_IMG_CF_INDEXED_8BIT) {
lv_img_built_in_decoder_line_indexed(x, y, len, buf);
} else {
LV_LOG_WARN("Built-in image decoder read not supports the color format");
return false;
}
#else
LV_LOG_WARN("Image built-in decoder can't read file because USE_LV_FILESYSTEM = 0");
return false;
#endif
} else if(decoder_src_type == LV_IMG_SRC_VARIABLE) {
const lv_img_dsc_t * img_dsc = decoder_src;
if(img_dsc->header.cf == LV_IMG_CF_ALPHA_1BIT ||
img_dsc->header.cf == LV_IMG_CF_ALPHA_2BIT ||
img_dsc->header.cf == LV_IMG_CF_ALPHA_4BIT ||
img_dsc->header.cf == LV_IMG_CF_ALPHA_8BIT) {
lv_img_built_in_decoder_line_alpha(x, y, len, buf);
} else if(img_dsc->header.cf == LV_IMG_CF_INDEXED_1BIT ||
img_dsc->header.cf == LV_IMG_CF_INDEXED_2BIT ||
img_dsc->header.cf == LV_IMG_CF_INDEXED_4BIT ||
img_dsc->header.cf == LV_IMG_CF_INDEXED_8BIT) {
lv_img_built_in_decoder_line_indexed(x, y, len, buf);
} else {
LV_LOG_WARN("Built-in image decoder not supports the color format");
return false;
}
}
return true;
}
static void lv_img_decoder_close(void)
{
/*Try to close with the custom functions*/
if(decoder_custom) {
if(lv_img_decoder_close_custom) lv_img_decoder_close_custom();
return;
}
/*It was opened with built-in decoder*/
if(decoder_src) {
#if USE_LV_FILESYSTEM
if(decoder_src_type == LV_IMG_SRC_FILE) {
lv_fs_close(&decoder_file);
}
#endif
decoder_src_type = LV_IMG_SRC_UNKNOWN;
decoder_src = NULL;
}
}
static lv_res_t lv_img_built_in_decoder_line_alpha(lv_coord_t x, lv_coord_t y, lv_coord_t len, uint8_t * buf)
{
#if LV_IMG_CF_ALPHA
const lv_opa_t alpha1_opa_table[2] = {0, 255}; /*Opacity mapping with bpp = 1 (Just for compatibility)*/
const lv_opa_t alpha2_opa_table[4] = {0, 85, 170, 255}; /*Opacity mapping with bpp = 2*/
const lv_opa_t alpha4_opa_table[16] = {0, 17, 34, 51, /*Opacity mapping with bpp = 4*/
68, 85, 102, 119,
136, 153, 170, 187,
204, 221, 238, 255
};
/*Simply fill the buffer with the color. Later only the alpha value will be modified.*/
lv_color_t bg_color = decoder_style->image.color;
lv_coord_t i;
for(i = 0; i < len; i++) {
#if LV_COLOR_DEPTH == 8 || LV_COLOR_DEPTH == 1
buf[i * LV_IMG_PX_SIZE_ALPHA_BYTE] = bg_color.full;
#elif LV_COLOR_DEPTH == 16
/*Because of Alpha byte 16 bit color can start on odd address which can cause crash*/
buf[i * LV_IMG_PX_SIZE_ALPHA_BYTE] = bg_color.full & 0xFF;
buf[i * LV_IMG_PX_SIZE_ALPHA_BYTE + 1] = (bg_color.full >> 8) & 0xFF;
#elif LV_COLOR_DEPTH == 32
*((uint32_t *)&buf[i * LV_IMG_PX_SIZE_ALPHA_BYTE]) = bg_color.full;
#else
#error "Invalid LV_COLOR_DEPTH. Check it in lv_conf.h"
#endif
}
const lv_opa_t * opa_table = NULL;
uint8_t px_size = lv_img_color_format_get_px_size(decoder_header.cf);
uint16_t mask = (1 << px_size) - 1; /*E.g. px_size = 2; mask = 0x03*/
lv_coord_t w = 0;
uint32_t ofs = 0;
int8_t pos = 0;
switch(decoder_header.cf) {
case LV_IMG_CF_ALPHA_1BIT:
w = (decoder_header.w >> 3); /*E.g. w = 20 -> w = 2 + 1*/
if(decoder_header.w & 0x7) w++;
ofs += w * y + (x >> 3); /*First pixel*/
pos = 7 - (x & 0x7);
opa_table = alpha1_opa_table;
break;
case LV_IMG_CF_ALPHA_2BIT:
w = (decoder_header.w >> 2); /*E.g. w = 13 -> w = 3 + 1 (bytes)*/
if(decoder_header.w & 0x3) w++;
ofs += w * y + (x >> 2); /*First pixel*/
pos = 6 - ((x & 0x3) * 2);
opa_table = alpha2_opa_table;
break;
case LV_IMG_CF_ALPHA_4BIT:
w = (decoder_header.w >> 1); /*E.g. w = 13 -> w = 6 + 1 (bytes)*/
if(decoder_header.w & 0x1) w++;
ofs += w * y + (x >> 1); /*First pixel*/
pos = 4 - ((x & 0x1) * 4);
opa_table = alpha4_opa_table;
break;
case LV_IMG_CF_ALPHA_8BIT:
w = decoder_header.w; /*E.g. x = 7 -> w = 7 (bytes)*/
ofs += w * y + x; /*First pixel*/
pos = 0;
break;
}
#if USE_LV_FILESYSTEM
# if LV_COMPILER_VLA_SUPPORTED
uint8_t fs_buf[w];
# else
uint8_t fs_buf[LV_HOR_RES];
# endif
#endif
const uint8_t * data_tmp = NULL;
if(decoder_src_type == LV_IMG_SRC_VARIABLE) {
const lv_img_dsc_t * img_dsc = decoder_src;
data_tmp = img_dsc->data + ofs;
} else {
#if USE_LV_FILESYSTEM
lv_fs_seek(&decoder_file, ofs + 4); /*+4 to skip the header*/
lv_fs_read(&decoder_file, fs_buf, w, NULL);
data_tmp = fs_buf;
#else
LV_LOG_WARN("Image built-in alpha line reader can't read file because USE_LV_FILESYSTEM = 0");
data_tmp = NULL; /*To avoid warnings*/
return LV_RES_INV;
#endif
}
uint8_t byte_act = 0;
uint8_t val_act;
for(i = 0; i < len; i ++) {
val_act = (data_tmp[byte_act] & (mask << pos)) >> pos;
buf[i * LV_IMG_PX_SIZE_ALPHA_BYTE + LV_IMG_PX_SIZE_ALPHA_BYTE - 1] =
decoder_header.cf == LV_IMG_CF_ALPHA_8BIT ? val_act : opa_table[val_act];
pos -= px_size;
if(pos < 0) {
pos = 8 - px_size;
data_tmp++;
}
}
return LV_RES_OK;
#else
LV_LOG_WARN("Image built-in alpha line reader failed because LV_IMG_CF_ALPHA is 0 in lv_conf.h");
return LV_RES_INV;
#endif
}
static lv_res_t lv_img_built_in_decoder_line_indexed(lv_coord_t x, lv_coord_t y, lv_coord_t len, uint8_t * buf)
{
#if LV_IMG_CF_INDEXED
uint8_t px_size = lv_img_color_format_get_px_size(decoder_header.cf);
uint16_t mask = (1 << px_size) - 1; /*E.g. px_size = 2; mask = 0x03*/
lv_coord_t w = 0;
int8_t pos = 0;
uint32_t ofs = 0;
switch(decoder_header.cf) {
case LV_IMG_CF_INDEXED_1BIT:
w = (decoder_header.w >> 3); /*E.g. w = 20 -> w = 2 + 1*/
if(decoder_header.w & 0x7) w++;
ofs += w * y + (x >> 3); /*First pixel*/
ofs += 8; /*Skip the palette*/
pos = 7 - (x & 0x7);
break;
case LV_IMG_CF_INDEXED_2BIT:
w = (decoder_header.w >> 2); /*E.g. w = 13 -> w = 3 + 1 (bytes)*/
if(decoder_header.w & 0x3) w++;
ofs += w * y + (x >> 2); /*First pixel*/
ofs += 16; /*Skip the palette*/
pos = 6 - ((x & 0x3) * 2);
break;
case LV_IMG_CF_INDEXED_4BIT:
w = (decoder_header.w >> 1); /*E.g. w = 13 -> w = 6 + 1 (bytes)*/
if(decoder_header.w & 0x1) w++;
ofs += w * y + (x >> 1); /*First pixel*/
ofs += 64; /*Skip the palette*/
pos = 4 - ((x & 0x1) * 4);
break;
case LV_IMG_CF_INDEXED_8BIT:
w = decoder_header.w; /*E.g. x = 7 -> w = 7 (bytes)*/
ofs += w * y + x; /*First pixel*/
ofs += 1024; /*Skip the palette*/
pos = 0;
break;
}
#if USE_LV_FILESYSTEM
# if LV_COMPILER_VLA_SUPPORTED
uint8_t fs_buf[w];
# else
uint8_t fs_buf[LV_HOR_RES];
# endif
#endif
const uint8_t * data_tmp = NULL;
if(decoder_src_type == LV_IMG_SRC_VARIABLE) {
const lv_img_dsc_t * img_dsc = decoder_src;
data_tmp = img_dsc->data + ofs;
} else {
#if USE_LV_FILESYSTEM
lv_fs_seek(&decoder_file, ofs + 4); /*+4 to skip the header*/
lv_fs_read(&decoder_file, fs_buf, w, NULL);
data_tmp = fs_buf;
#else
LV_LOG_WARN("Image built-in indexed line reader can't read file because USE_LV_FILESYSTEM = 0");
data_tmp = NULL; /*To avoid warnings*/
return LV_RES_INV;
#endif
}
uint8_t byte_act = 0;
uint8_t val_act;
lv_coord_t i;
lv_color_t * cbuf = (lv_color_t *) buf;
for(i = 0; i < len; i ++) {
val_act = (data_tmp[byte_act] & (mask << pos)) >> pos;
cbuf[i] = decoder_index_map[val_act];
pos -= px_size;
if(pos < 0) {
pos = 8 - px_size;
data_tmp++;
}
}
return LV_RES_OK;
#else
LV_LOG_WARN("Image built-in indexed line reader failed because LV_IMG_CF_INDEXED is 0 in lv_conf.h");
return LV_RES_INV;
#endif
}
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