Problems with Bitmaps on TFT Display using GFX Library

Other Hardware Displays
7

Not only code, but placing DATA in header is also a bad idea.
You can use same style, but data may be duplicated.
For example, take attention to TEXT section in compiler's output below.

Header file with data:

#ifndef SAMPLE_DATA_H_
#define SAMPLE_DATA_H_

#include <stdint.h>

static const uint8_t const data_array[10240] = { 1, 2, 3 };


#endif /* SAMPLE_DATA_H_ */

Data file not used anywhere and excluded by compiler:

Invoking: Cross ARM GNU Print Size
arm-none-eabi-size --format=berkeley "test-f4.elf"
   text   data    bss    dec    hex filename
  13864    476   1588  15928   3e38 test-f4.elf
Finished building: test-f4.siz

Header file included in only one C-file:

#include "sample-data.h"
#include "stm32f4xx_hal.h"

void method1(void) {
 uint8_t b = 0;
 for (uint32_t i = 0; i < sizeof(data_array); i++) {
 if (data_array[i] != 0) {
 b = 1;
 }
 }
 if (b == 1) {
 __HAL_RCC_GPIOB_CLK_ENABLE();
 }
}

Invoking: Cross ARM GNU Print Size
arm-none-eabi-size --format=berkeley "test-f4.elf"
   text   data    bss    dec    hex filename
  24192    476   1588  26256   6690 test-f4.elf
Finished building: test-f4.siz
 

22:10:51 Build Finished (took 1s.432ms)

Header file also included to second C-file:

#include "sample-data.h"
#include "stm32f4xx_hal.h"

void method2(void) {
 uint8_t b = 0;
 for (uint32_t i = 0; i < sizeof(data_array); i++) {
 if (data_array[i] != 0) {
 b = 1;
 }
 }
 if (b == 1) {
 __HAL_RCC_GPIOB_CLK_ENABLE();
 }
}

Invoking: Cross ARM GNU Print Size
arm-none-eabi-size --format=berkeley "test-f4.elf"
   text	   data	    bss	    dec	    hex	filename
  34520	    476	   1588	  36584	   8ee8	test-f4.elf
Finished building: test-f4.siz
 

22:13:04 Build Finished (took 1s.487ms)

And now only data's declaration in header:

#ifndef SAMPLE_DATA_H_
#define SAMPLE_DATA_H_

#include <stdint.h>

extern const uint8_t const data_array[10240];

#endif /* SAMPLE_DATA_H_ */

and data's definition in C source file:

#include "sample-data.h"

const uint8_t const data_array[10240] = { 1, 2, 3 };

Using this declaration in only one C file (same code) give next output:

Invoking: Cross ARM GNU Print Size
arm-none-eabi-size --format=berkeley "test-f4.elf"
   text   data    bss    dec    hex filename
  24192    476   1588  26256   6690 test-f4.elf
Finished building: test-f4.siz
 

22:21:10 Build Finished (took 1s.395ms)

Also include in second C source file:

Invoking: Cross ARM GNU Print Size
arm-none-eabi-size --format=berkeley "test-f4.elf"
   text   data    bss    dec    hex filename
  24280    476   1588  26344   66e8 test-f4.elf
Finished building: test-f4.siz
 

22:22:19 Build Finished (took 1s.268ms)

And now imagine for a minute that the data structure is a font size of 200 KB ...

Does the Arduino's compiler solve this duplication problem automatically?