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fix: monochrome (#9)

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* fix: monochrome

* update doc

* update doc
This commit is contained in:
Klemek
2025-06-05 12:05:49 +02:00
committed by GitHub
parent 0172286d9a
commit 8f7d7aaaaa
4 changed files with 38 additions and 23 deletions
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src/bmp.c
+30 -17
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@@ -32,23 +32,36 @@ unsigned char *bmp_header(unsigned short width, unsigned short height,
unsigned char *output = (unsigned char *)malloc(HEADER_SIZE);
unsigned int data_length = ((unsigned int)width) * ((unsigned int)height) *
((unsigned int)color_depth);
write_str(output, 0x00, 0x02, (unsigned char *)"BM"); // 0x00(2) BM
write_num(output, 0x02, 0x04,
HEADER_SIZE + data_length); // 0x02(4) file size
write_nul(output, 0x06, 0x04); // 0x06(4) application reserved
write_num(output, 0x0A, 0x04, HEADER_SIZE); // 0x0A(4) data offset
write_num(output, 0x0E, 0x04, 40); // 0x0E(4) DIB header size
write_num(output, 0x12, 0x04, width); // 0x12(4) width
write_num(output, 0x16, 0x04, height); // 0x16(4) height
write_num(output, 0x1A, 0x04, 1); // 0x1A(2) color panes
write_num(output, 0x1C, 0x02, color_depth * 8); // 0x1C(2) bits per pixel
write_nul(output, 0x1E, 0x04); // 0x1E(4) BI_RGB, no compression
write_num(output, 0x22, 0x04,
data_length); // 0x22(4) size of raw bitmap data
write_num(output, 0x26, 0x04, 2835); // 0x26(4) horizontal print resolution
write_num(output, 0x2A, 0x04, 2835); // 0x2A(4) vertical print resolution
write_nul(output, 0x2E, 0x04); // 0x2E(4) color in palette
write_nul(output, 0x32, 0x04); // 0x32(4) 0 important colors
// 0x00(2) BM
write_str(output, 0x00, 0x02, (unsigned char *)"BM");
// 0x02(4) file size
write_num(output, 0x02, 0x04, HEADER_SIZE + data_length);
// 0x06(4) application reserved
write_nul(output, 0x06, 0x04);
// 0x0A(4) data offset
write_num(output, 0x0A, 0x04, HEADER_SIZE);
// 0x0E(4) DIB header size
write_num(output, 0x0E, 0x04, 40);
// 0x12(4) width
write_num(output, 0x12, 0x04, width);
// 0x16(4) height
write_num(output, 0x16, 0x04, height);
// 0x1A(2) color panes
write_num(output, 0x1A, 0x04, 1);
// 0x1C(2) bits per pixel
write_num(output, 0x1C, 0x02, color_depth * 8);
// 0x1E(4) BI_RGB, no compression
write_nul(output, 0x1E, 0x04);
// 0x22(4) size of raw bitmap data
write_num(output, 0x22, 0x04, data_length);
// 0x26(4) horizontal print resolution
write_num(output, 0x26, 0x04, 2835);
// 0x2A(4) vertical print resolution
write_num(output, 0x2A, 0x04, 2835);
// 0x2E(4) color in palette (0)
write_nul(output, 0x2E, 0x04);
// 0x32(4) important colors (0)
write_nul(output, 0x32, 0x04);
return output;
}