Decoding bmp ?

[antonius]

Posted on April 11, 2014 at 11:21

Guys,

Does anyone of you have experience on decoding bmp ?

I want to display bmp file to my LCD...

Any clues ?

thanks

#i-have-a-clue

[antonius]

Posted on April 19, 2014 at 04:06

I don't understand, it's already working on your side ? do I miss some registers on my init ?

I used your LCD init, still the same result....it's not from the init...

[antonius]

Posted on April 19, 2014 at 04:08

I used the same init you have, still the same result,

Do I miss something in my LCD bitmap function ? thanks

[antonius]

Posted on April 19, 2014 at 04:26

wild guess

    pal = ((pal & 0x1F0000) >> 8) | ((pal & 0x007E00) >> 5) | ((pal & 0x0000F8) >> 3);

giving me a greenish mix with blueish....

[antonius]

Posted on April 19, 2014 at 04:34

I fixed it,

 f_read(&fsrc, hdr_256, sizeof(hdr_256), &bytesread); // Read header

I missed

sizeof(hdr) supposed to be sizeof(hdr_256),

 

 f_read(&fsrc, hdr_256, sizeof(hdr), &bytesread); // Read header

Thanks a lot for helping me out,

for example I want to use 16K colors, I just change the 256 loop ?

It works now

http://youtu.be/BC2m2Yg5xDg

[antonius]

Posted on April 19, 2014 at 04:58

for 16K color will be like this ? please correct me if I'm wrong, thanks

//16K color bmp

res = f_open(&fsrc, ''test9.bmp'', FA_READ);


f_read(&fsrc, hdr_256, sizeof(hdr_256), &bytesread); // Read header


off = *((uint32_t *)&hdr_256[0x0A]); // offset to rasters


xx = *((uint32_t *)&hdr_256[0x12]); // X pixels


yy = *((uint32_t *)&hdr_256[0x16]); // Y pixels


for(i=0; i<
16384
; i++) // Build palette conversion (+0x46 count?)

{

uint32_t pal;


f_read(&fsrc, &pal, 4, &bytesread); // Read palette B G R


// RRRRRRRRGGGGGGGGBBBBBBBB 8:8:8

// BBBBBGGGGGGRRRRR 5:6:5


//pal = ((pal & 0x00FC00) >> 5) | ((pal & 0xF80000) >> 19) | ((pal & 0x0000F8) << 
8
);

pal = ((pal & 0xF80000) >> 8) | ((pal & 0x00FC00) >> 5) | ((pal & 0x0000F8) >> 3);

//pal = ((pal & 0x1F0000) >> 8) | ((pal & 0x007E00) >> 5) | ((pal & 0x0000F8) >> 3);


w[i] = (uint16_t)pal; 

}


f_lseek(&fsrc, off); // Seek to the data


for(y=0; y<yy; y++)

{

for(x=0; x<xx; x++)

{

uint8_t b;


f_read(&fsrc, &b, 1, &bytesread); // Read byte


LCD_SetPoint(y, x, w[b]); // Colour Map

} // x

} // y


f_close(&fsrc);

[Tesla DeLorean]

Posted on April 19, 2014 at 04:59

for example I want to use 16M colors, I just change the 256 loop ?

The high colour depth files don't need the palette tables, each pixel is described individually, and you'd need to transform into the 5:6:5 64K colour space of the display, or whatever it is capable of.

[antonius]

Posted on April 19, 2014 at 05:02

for 16K color will be like this ? please correct me if I'm wrong, thanks

//16K color bmp

res = f_open(&fsrc, ''test9.bmp'', FA_READ);


f_read(&fsrc, hdr_256, sizeof(hdr_256), &bytesread); // Read header


off = *((uint32_t *)&hdr_256[0x0A]); // offset to rasters


xx = *((uint32_t *)&hdr_256[0x12]); // X pixels


yy = *((uint32_t *)&hdr_256[0x16]); // Y pixels


for(i=0; i<
16384
; i++) // Build palette conversion (+0x46 count?)

{

uint32_t pal;


f_read(&fsrc, &pal, 4, &bytesread); // Read palette B G R


// RRRRRRRRGGGGGGGGBBBBBBBB 8:8:8

// BBBBBGGGGGGRRRRR 5:6:5


//pal = ((pal & 0x00FC00) >> 5) | ((pal & 0xF80000) >> 19) | ((pal & 0x0000F8) << 
8
);

pal = ((pal & 0xF80000) >> 8) | ((pal & 0x00FC00) >> 5) | ((pal & 0x0000F8) >> 3);

//pal = ((pal & 0x1F0000) >> 8) | ((pal & 0x007E00) >> 5) | ((pal & 0x0000F8) >> 3);


w[i] = (uint16_t)pal; 

}


f_lseek(&fsrc, off); // Seek to the data


for(y=0; y<yy; y++)

{

for(x=0; x<xx; x++)

{

uint8_t b;


f_read(&fsrc, &b, 1, &bytesread); // Read byte


LCD_SetPoint(y, x, w[b]); // Colour Map

} // x

} // y


f_close(&fsrc);

[antonius]

Posted on April 19, 2014 at 05:11

do you have example for it ? thanks

[Tesla DeLorean]

Posted on April 19, 2014 at 05:14

for 16K color will be like this ? please correct me if I'm wrong, thanks

16K? Don't you mean 24-bit 16M? There isn't a palette table, you go directly to the pixel data, and then you have to convert that to the colour space of your display.

[Tesla DeLorean]

Posted on April 19, 2014 at 05:19

do you have example for it ? thanks

Like all of these I'd have to write one, do you have a sample 24-bit 320x240 image as a reference?