GUI_MBITMAP_CreateEx example

Dejan · April 13, 2025 at 1:18 PM

Is there an example how to create in-memory bitmap of an image stored in external .dta file?
We have plenty of RAM and want to store all bitmaps on SD card and then, on power-up, load them in to RAM
for faster access.

- Dejan

cilmagemlu · April 14, 2025 at 3:36 PM

Hello,

just had such a code based on GUI_MBITMAP_Create() sample under WIN32. For using in WIN32 simulation add opengl32.lib in the linker input.

C: Main.c

#include "DIALOG.h"
#include "windows.h"


#define FILE_PATH "C:\\Image.dta"


HANDLE hFile;


GUI_MBITMAP * pMBitmap;


IMAGE_Handle hImage;


int _GetData(void * p, const U8 ** ppData, unsigned NumBytes, U32 Off) {
	HANDLE * phFile;
	DWORD NumBytesRead;
	U8 * pData;
	pData = (U8 *)*ppData;
	phFile = (HANDLE *)p;


	SetFilePointer(*phFile, Off, 0, FILE_BEGIN);


	ReadFile(*phFile, pData, NumBytes, &NumBytesRead, NULL);


	return NumBytesRead;
}


void MainTask(void) {
	GUI_Init();


	WM_MULTIBUF_Enable(1);


	hFile = CreateFile(FILE_PATH, GENERIC_READ, 0, 0, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0);


	pMBitmap = GUI_MBITMAP_CreateEx(GUI_MBITMAP_DTA_EX, _GetData, &hFile);


	hImage = IMAGE_CreateEx(10, 10,
		GUI_MBITMAP_2BITMAP(pMBitmap)->XSize,
		GUI_MBITMAP_2BITMAP(pMBitmap)->YSize,
		WM_HBKWIN,
		WM_CF_SHOW,
		0,
		GUI_ID_IMAGE0);


	IMAGE_SetBitmap(hImage, GUI_MBITMAP_2BITMAP(pMBitmap));


	while (1) {
		GUI_Delay(50);
	}
}

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