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这段显示图片的程序看不明白，能帮忙看看分析一下吗？

void LCD_WriteBMP(uint32_t BmpAddress)

{
uint32_t index = 0, size = 0;
/* Read bitmap size */
size = *(__IO uint16_t *) (BmpAddress + 2);
size |= (*(__IO uint16_t *) (BmpAddress + 4)) << 16;
/* Get bitmap data address offset */
index = *(__IO uint16_t *) (BmpAddress + 10);
index |= (*(__IO uint16_t *) (BmpAddress + 12)) << 16;
size = (size - index)/2;
BmpAddress += index;
/* Set GRAM write direction and BGR = 1 */
/* I/D=00 (Horizontal : decrement, Vertical : decrement) */
/* AM=1 (address is updated in vertical writing direction) */
LCD_WriteReg(LCD_REG_3, 0x1008);

LCD_WriteRAM_Prepare();

for(index = 0; index < size; index++)
{
LCD_WriteRAM(*(__IO uint16_t *)BmpAddress);
BmpAddress += 2;
}

/* Set GRAM write direction and BGR = 1 */
/* I/D = 01 (Horizontal : increment, Vertical : decrement) */
/* AM = 1 (address is updated in vertical writing direction) */
LCD_WriteReg(LCD_REG_3, 0x1018);
}