How to draw sprites using DMA2D with transparency?

Hello ,

I am using STM32F429I-Discovery board I want to draw sprites on TFT-LCD with transparency on top of background image , I used black color as the transparent color for the images that I want to draw and used DMA2D at blending mode but the black color is not transparent and the sprite was drawn with a black color surrounding it.

the sprite color mode is RGB565 (I have tried ARGB888 also with no hope) .

The code :

void DrawSprite(uint32_t img , uint32_t SprNo , uint32_t w , uint32_t h , int format)
{
	/* Configure the DMA2D Mode, Color Mode and output offset */
	 Dma2dHandle.Instance = DMA2D;
	 Dma2dHandle.Init.ColorMode = DMA2D_RGB565;
	 Dma2dHandle.Init.OutputOffset = 240 - w ;
 
	 /* Foreground Configuration */
	 Dma2dHandle.LayerCfg[1].AlphaMode = DMA2D_NO_MODIF_ALPHA;
	 Dma2dHandle.LayerCfg[1].InputAlpha = 0xFF;
	 Dma2dHandle.LayerCfg[1].InputColorMode = format;
	 Dma2dHandle.LayerCfg[1].InputOffset = 0;
 
 
 
	 if(SprNo == BACKGROUND)
	 {
		 Dma2dHandle.Init.Mode = DMA2D_M2M ;
	 }
	 else
	 {
		 Dma2dHandle.Init.Mode = DMA2D_M2M_BLEND ;
 
		 /* Foreground Configuration */
		 Dma2dHandle.LayerCfg[0].AlphaMode = DMA2D_NO_MODIF_ALPHA;
		 Dma2dHandle.LayerCfg[0].InputAlpha = 0xFF;
		 Dma2dHandle.LayerCfg[0].InputColorMode = DMA2D_INPUT_RGB565;
		 Dma2dHandle.LayerCfg[0].InputOffset = Dma2dHandle.Init.OutputOffset;
 
		 /* Configure DMA2D Stream source2 address */
		 WRITE_REG(Dma2dHandle.Instance->BGMAR, (uint32_t)RenderBuffer);
	 }
 
 
	 /* DMA2D Initialization */
	 HAL_DMA2D_Init(&Dma2dHandle);
 
	 HAL_DMA2D_ConfigLayer(&Dma2dHandle, 1);
	 if(SprNo != BACKGROUND)
		 HAL_DMA2D_ConfigLayer(&Dma2dHandle, 0);
 
	 /*DMA2D Transfer Start*/
	 HAL_DMA2D_Start(&Dma2dHandle,(uint32_t) img, (uint32_t)RenderBuffer, w, h );
	 HAL_DMA2D_PollForTransfer(&Dma2dHandle, 100);
}