how can i convert image.png color with BmpCvt.exe to an buffer 8 bit like stlogo.h and plot it in stm32f796i-discovery with a function BSP_LCD_DrawBitmap(uint32_t Xpos, uint32_t Ypos, uint8_t *pbmp) ??

[Abdou]

i convert an image RGB to a buffer 8 bits and plot it with a function BSP_LCD_DrawBitmap(), but not work correctly like logo image.

please any idea ?

thank you.

[YAY.1]

Hello,

After search on net too much time, i found a software that

@sebastien Dumoulin​ made.

https://www.electro-info.ovh/bitmap2headerfile

He or she did really well program, but i have some problems with that.

BSP_LCD_DrawBitmap function in stm32746g_discovery_lcd.c:

void BSP_LCD_DrawBitmap(uint32_t Xpos, uint32_t Ypos, uint8_t *pbmp)

{

 uint32_t index = 0, width = 0, height = 0, bit_pixel = 0;

 uint32_t address;

 uint32_t input_color_mode = 0;

 /* Get bitmap data address offset */

 index = pbmp[10] + (pbmp[11] << 8) + (pbmp[12] << 16) + (pbmp[13] << 24);

 /* Read bitmap width */

 width = pbmp[18] + (pbmp[19] << 8) + (pbmp[20] << 16) + (pbmp[21] << 24);

 /* Read bitmap height */

 height = pbmp[22] + (pbmp[23] << 8) + (pbmp[24] << 16) + (pbmp[25] << 24);

 /* Read bit/pixel */

 bit_pixel = pbmp[28] + (pbmp[29] << 8);

 /* Set the address */

 address = hLtdcHandler.LayerCfg[ActiveLayer].FBStartAdress + (((BSP_LCD_GetXSize()*Ypos) + Xpos)*(4));

 /* Get the layer pixel format */   

 if ((bit_pixel/8) == 4)

 {

  input_color_mode = CM_ARGB8888;

 }

 else if ((bit_pixel/8) == 2)

 {

  input_color_mode = CM_RGB565;  

 }

 else 

 {

  input_color_mode = CM_RGB888;

 }

 /* Bypass the bitmap header */

 pbmp += (index + (width * (height - 1) * (bit_pixel/8)));

 /* Convert picture to ARGB8888 pixel format */

 for(index=0; index < height; index++)

 {

  /* Pixel format conversion */

  LL_ConvertLineToARGB8888((uint32_t *)pbmp, (uint32_t *)address, width, input_color_mode);

  /* Increment the source and destination buffers */

  address+= (BSP_LCD_GetXSize()*4);

  pbmp -= width*(bit_pixel/8);

 }

}

Software export (in pictures.h):

  

stm32f746g-disco BSP_LCD_DrawBitmap() function main.c:

#include "pictures.h"

BSP_SDRAM_Init(); /* Initializes the SDRAM device */

  __HAL_RCC_CRC_CLK_ENABLE(); /* Enable the CRC Module */

  BSP_TS_Init(480, 272);

  BSP_LCD_Init();

  BSP_LCD_LayerDefaultInit(0, LCD_FB_START_ADDRESS);

  BSP_LCD_DisplayOn();

  BSP_LCD_SelectLayer(0);

  BSP_LCD_Clear(LCD_COLOR_RED);

  BSP_LCD_DisplayStringAt(0, 100, (uint8_t *)"Hello!", CENTER_MODE);

  HAL_Delay(700);

  BSP_LCD_Clear(LCD_COLOR_RED);

  BSP_LCD_DrawBitmap((BSP_LCD_GetXSize() - 80) / 2, (BSP_LCD_GetYSize() - 80) / 2, (uint8_t *)logo);

  HAL_Delay(500);

Software with png:

but after upload to stm32f746g-disco showing on lcd this:

Problems:

1)The picture started to drawing on half of the picture.

2)The picture slipped a little.

Do anyone have any opinion how to fix these ?

Software owner said that this program open source software. Could someone say how to change somethings in The software ?

Could someone recommend a program like this software that png to .h file with this format correctly ?

[Tesla DeLorean]

Making the .H files contain hex arrays is a trivial exercise. One can do it for any file.

The problem is with the underlying format of the data, and how you process it. The .BMP files are a simple bitmap/raster format.

Things like .GIF, .JPG and .PNG are more complicated involving encoding and compression methods that need to be managed to unpack the data into lines/rasters and painted into the frame buffer.

The shift and diagonal line suggests you've got the line length off-byte-one, or perhaps the x and y dimensions switched.