STM32LTDC: Fix bug in DMA2D blitting

Thanks to @nathanwiebe for reporting this:
https://community.ugfx.io/topic/3159-a-bug-in-the-stm32-ltdc-driver

changelog.txt

@@ -16,6 +16,7 @@ CHANGE:     STM32LTDC driver: Rename ALLOW_2ND_LAYER to STM32LTDC_USE_LAYER2.
 CHANGE:     STM32LTDC driver: Rename LTDC_DMA_CACHE_FLUSH to STM32LTDC_DMA_CACHE_FLUSH.
 CHANGE:     STM32LTDC driver: Rename GDISP_LTDC_USE_RGB565 to STM32LTDC_USE_RGB565.
 FEATURE:    STM32LTDC driver: Support double buffering. This introduces STM32LTDC_USE_DOUBLEBUFFERING.
+FIX:        STM32LTDC driver: Fix bug in gdisp_lld_blit_area() which affected blits with source coordinates other than (0, 0).
 FIX:        Improve /demos/benchmarks/rectangles
 
 

drivers/gdisp/STM32LTDC/gdisp_lld_STM32LTDC.c

@@ -564,7 +564,7 @@ LLDSPEC	gColor gdisp_lld_get_pixel_color(GDisplay* g) {
 		LLDSPEC void gdisp_lld_blit_area(GDisplay* g) {
 			gU32	srcstart, dststart;
 
-			srcstart = LTDC_PIXELBYTES * ((gU32)g->p.x2 * g->p.y1 * + g->p.x1) + (gU32)g->p.ptr;
+			srcstart = LTDC_PIXELBYTES * ((gU32)g->p.x2 * g->p.y1 + g->p.x1) + (gU32)g->p.ptr;
 			dststart = (gU32)PIXEL_ADDR(g, PIXEL_POS(g, g->p.x, g->p.y));
 
 			#if STM32LTDC_DMA_CACHE_FLUSH