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LVGL Fix BMP format for `lv.screenshot()`

This commit is contained in:
Stephan Hadinger 2022-10-08 09:44:32 +02:00
parent 4c00bf54d5
commit 6cc52e0128
1 changed files with 12 additions and 11 deletions
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23
tasmota/tasmota_xdrv_driver/xdrv_52_3_berry_lvgl.ino
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@ -514,15 +514,14 @@ extern "C" {
// write BMP header
static const uint8_t bmp_sign[] = { 0x42, 0x4d }; // BM = Windows
f.write(bmp_sign, sizeof(bmp_sign));
size_t bmp_size = bmp_width * bmp_height * LV_COLOR_DEPTH / 8 + 0x44;
size_t bmp_size = bmp_width * bmp_height * LV_COLOR_DEPTH / 8 + 0x42;
f.write((uint8_t*)&bmp_size, sizeof(bmp_size));
uint32_t zero = 0;
f.write((uint8_t*) &zero, sizeof(zero)); // reserved 4-bytes
uint32_t bmp_offset_to_pixels = 0x44; // TODO
uint32_t bmp_offset_to_pixels = 0x42; // TODO
f.write((uint8_t*) &bmp_offset_to_pixels, sizeof(bmp_offset_to_pixels));
// DIB Header BITMAPINFOHEADER
size_t bmp_dib_header_size = 52; // BITMAPV2INFOHEADER
size_t bmp_dib_header_size = 0x28;
f.write((uint8_t*) &bmp_dib_header_size, sizeof(bmp_dib_header_size));
f.write((uint8_t*) &bmp_width, sizeof(bmp_width));
@ -530,13 +529,15 @@ extern "C" {
// rest of header
// BITMAPV2INFOHEADER = 52 bytes header, 40 bytes sub-header
static const uint8_t bmp_dib_header[] = {
static const uint8_t bmp_dib_header1[] = {
0x01, 0x00, // planes
16, 0x00, // bits per pixel = 16
0x03, 0x00, 0x00, 0x00, // compression = BI_BITFIELDS uncrompressed
0x00, 0x00, 0x00, 0x00, // Image size, 0 is valid for BI_RGB (uncompressed) TODO
0x00, 0x00, 0x00, 0x00, // X pixels per meter
0x00, 0x00, 0x00, 0x00, // Y pixels per meter
};
static const uint8_t bmp_dib_header2[] = {
0xC4, 0xE0, 0x00, 0x00, // X pixels per meter
0xC4, 0xE0, 0x00, 0x00, // Y pixels per meter
0x00, 0x00, 0x00, 0x00, // Colors in table
0x00, 0x00, 0x00, 0x00, // Important color count
@ -544,10 +545,10 @@ extern "C" {
0x00, 0xF8, 0x00, 0x00, // Red channel mask
0xE0, 0x07, 0x00, 0x00, // Green channel mask
0x1F, 0x00, 0x00, 0x00, // Blue channel mask
0x00, 0x00, // Padding to align on 4 bytes boundary
};
f.write(bmp_dib_header, sizeof(bmp_dib_header));
f.write(bmp_dib_header1, sizeof(bmp_dib_header1));
f.write((uint8_t*)&bmp_size, sizeof(bmp_size));
f.write(bmp_dib_header2, sizeof(bmp_dib_header2));
// now we can write the pixels array
// redraw screen