GDISP revamp - stage 1

New low level driver interface: Only Win32 ported currently
Significant reduction in GDISP stack usage
Improved performance particularly for native streaming drivers
New circle, ellipse, arc routines (draw and fill) that are significantly more efficient and don't overdraw
New arc draw algorithm that measures angles correctly.
New arc fill algorithm for that actually works without overdrawing or gaps.
Much more to come...

2 files changed, 94 insertions, 666 deletions

diff --git a/include/gdisp/lld/emulation.c b/include/gdisp/lld/emulation.c
deleted file mode 100644
index cb0c9c4b..00000000
--- a/include/gdisp/lld/emulation.c
+++ /dev/null
@@ -1,558 +0,0 @@
-/*
- * This file is subject to the terms of the GFX License. If a copy of
- * the license was not distributed with this file, you can obtain one at:
- *
- *              http://ugfx.org/license.html
- */
-
-/**
- * @file	include/gdisp/lld/emulation.c
- * @brief	GDISP emulation routines for stuff the driver dosen't support
- *
- * @addtogroup GDISP
- *
- * @details	Even though this is a software emulation of a low level driver
- *			most validation doesn't need to happen here as eventually
- *			we call a real low level driver routine and if validation is
- *			required - it will do it.
- *
- * @{
- */
-#ifndef GDISP_EMULATION_C
-#define GDISP_EMULATION_C
-
-#if GFX_USE_GDISP
-
-/* Include the low level driver information */
-#include "gdisp/lld/gdisp_lld.h"
-
-/* Declare the GDISP structure */
-GDISPDriver	GDISP;
-
-#if !GDISP_HARDWARE_CLEARS 
-	void gdisp_lld_clear(color_t color) {
-		gdisp_lld_fill_area(0, 0, GDISP.Width, GDISP.Height, color);
-	}
-#endif
-
-#if !GDISP_HARDWARE_LINES 
-	void gdisp_lld_draw_line(coord_t x0, coord_t y0, coord_t x1, coord_t y1, color_t color) {
-		int16_t dy, dx;
-		int16_t addx, addy;
-		int16_t P, diff, i;
-
-		#if GDISP_HARDWARE_FILLS || GDISP_HARDWARE_SCROLL
-		// speed improvement if vertical or horizontal
-		if (x0 == x1) {
-			if (y1 > y0)
-				gdisp_lld_fill_area(x0, y0, 1, y1-y0+1, color);
-			else
-				gdisp_lld_fill_area(x0, y1, 1, y0-y1+1, color);
-			return;
-		}
-		if (y0 == y1) {
-			if (x1 > x0)
-				gdisp_lld_fill_area(x0, y0, x1-x0+1, 1, color);
-			else
-				gdisp_lld_fill_area(x1, y0, x0-x1+1, 1, color);
-			return;
-		}
-		#endif
-
-		if (x1 >= x0) {
-			dx = x1 - x0;
-			addx = 1;
-		} else {
-			dx = x0 - x1;
-			addx = -1;
-		}
-		if (y1 >= y0) {
-			dy = y1 - y0;
-			addy = 1;
-		} else {
-			dy = y0 - y1;
-			addy = -1;
-		}
-
-		if (dx >= dy) {
-			dy *= 2;
-			P = dy - dx;
-			diff = P - dx;
-
-			for(i=0; i<=dx; ++i) {
-				gdisp_lld_draw_pixel(x0, y0, color);
-				if (P < 0) {
-					P  += dy;
-					x0 += addx;
-				} else {
-					P  += diff;
-					x0 += addx;
-					y0 += addy;
-				}
-			}
-		} else {
-			dx *= 2;
-			P = dx - dy;
-			diff = P - dy;
-
-			for(i=0; i<=dy; ++i) {
-				gdisp_lld_draw_pixel(x0, y0, color);
-				if (P < 0) {
-					P  += dx;
-					y0 += addy;
-				} else {
-					P  += diff;
-					x0 += addx;
-					y0 += addy;
-				}
-			}
-		}
-	}
-#endif
-
-#if !GDISP_HARDWARE_FILLS
-	void gdisp_lld_fill_area(coord_t x, coord_t y, coord_t cx, coord_t cy, color_t color) {
-		#if GDISP_HARDWARE_SCROLL
-			gdisp_lld_vertical_scroll(x, y, cx, cy, cy, color);
-		#elif GDISP_HARDWARE_LINES
-			coord_t x1, y1;
-			
-			x1 = x + cx - 1;
-			y1 = y + cy;
-			for(; y < y1; y++)
-				gdisp_lld_draw_line(x, y, x1, y, color);
-		#else
-			coord_t x0, x1, y1;
-			
-			x0 = x;
-			x1 = x + cx;
-			y1 = y + cy;
-			for(; y < y1; y++)
-				for(x = x0; x < x1; x++)
-					gdisp_lld_draw_pixel(x, y, color);
-		#endif
-	}
-#endif
-
-#if !GDISP_HARDWARE_BITFILLS
-	void gdisp_lld_blit_area_ex(coord_t x, coord_t y, coord_t cx, coord_t cy, coord_t srcx, coord_t srcy, coord_t srccx, const pixel_t *buffer) {
-			coord_t x0, x1, y1;
-			
-			x0 = x;
-			x1 = x + cx;
-			y1 = y + cy;
-			buffer += srcy*srccx+srcx;
-			srccx -= cx;
-			for(; y < y1; y++, buffer += srccx)
-				for(x=x0; x < x1; x++)
-					gdisp_lld_draw_pixel(x, y, *buffer++);
-	}
-#endif
-
-#if GDISP_NEED_CLIP && !GDISP_HARDWARE_CLIP
-	void gdisp_lld_set_clip(coord_t x, coord_t y, coord_t cx, coord_t cy) {
-		#if GDISP_NEED_VALIDATION
-			if (x >= GDISP.Width || y >= GDISP.Height || cx < 0 || cy < 0)
-				return;
-			if (x < 0) x = 0;
-			if (y < 0) y = 0;
-			if (x+cx > GDISP.Width) cx = GDISP.Width - x;
-			if (y+cy > GDISP.Height) cy = GDISP.Height - y;
-		#endif
-		GDISP.clipx0 = x;
-		GDISP.clipy0 = y;
-		GDISP.clipx1 = x+cx;
-		GDISP.clipy1 = y+cy;
-	}
-#endif
-
-#if GDISP_NEED_CIRCLE && !GDISP_HARDWARE_CIRCLES
-	void gdisp_lld_draw_circle(coord_t x, coord_t y, coord_t radius, color_t color) {
-		coord_t a, b, P;
-
-		a = 0;
-		b = radius;
-		P = 1 - radius;
-
-		do {
-			gdisp_lld_draw_pixel(x+a, y+b, color);
-			gdisp_lld_draw_pixel(x+b, y+a, color);
-			gdisp_lld_draw_pixel(x-a, y+b, color);
-			gdisp_lld_draw_pixel(x-b, y+a, color);
-			gdisp_lld_draw_pixel(x+b, y-a, color);
-			gdisp_lld_draw_pixel(x+a, y-b, color);
-			gdisp_lld_draw_pixel(x-a, y-b, color);
-			gdisp_lld_draw_pixel(x-b, y-a, color);
-			if (P < 0)
-				P += 3 + 2*a++;
-			else
-				P += 5 + 2*(a++ - b--);
-		} while(a <= b);
-	}
-#endif
-
-#if GDISP_NEED_CIRCLE && !GDISP_HARDWARE_CIRCLEFILLS
-	void gdisp_lld_fill_circle(coord_t x, coord_t y, coord_t radius, color_t color) {
-		coord_t a, b, P;
-		
-		a = 0;
-		b = radius;
-		P = 1 - radius;
-
-		do {
-			gdisp_lld_draw_line(x-a, y+b, x+a, y+b, color);
-			gdisp_lld_draw_line(x-a, y-b, x+a, y-b, color);
-			gdisp_lld_draw_line(x-b, y+a, x+b, y+a, color);
-			gdisp_lld_draw_line(x-b, y-a, x+b, y-a, color);
-			if (P < 0)
-				P += 3 + 2*a++;
-			else
-				P += 5 + 2*(a++ - b--);
-		} while(a <= b);
-	}
-#endif
-
-#if GDISP_NEED_ELLIPSE && !GDISP_HARDWARE_ELLIPSES
-	void gdisp_lld_draw_ellipse(coord_t x, coord_t y, coord_t a, coord_t b, color_t color) {
-		int  dx = 0, dy = b; /* im I. Quadranten von links oben nach rechts unten */
-		long a2 = a*a, b2 = b*b;
-		long err = b2-(2*b-1)*a2, e2; /* Fehler im 1. Schritt */
-
-		do {
-			gdisp_lld_draw_pixel(x+dx, y+dy, color); /* I. Quadrant */
-			gdisp_lld_draw_pixel(x-dx, y+dy, color); /* II. Quadrant */
-			gdisp_lld_draw_pixel(x-dx, y-dy, color); /* III. Quadrant */
-			gdisp_lld_draw_pixel(x+dx, y-dy, color); /* IV. Quadrant */
-
-			e2 = 2*err;
-			if(e2 <  (2*dx+1)*b2) {
-				dx++;
-				err += (2*dx+1)*b2;
-			}
-			if(e2 > -(2*dy-1)*a2) {
-				dy--;
-				err -= (2*dy-1)*a2;
-			}
-		} while(dy >= 0); 
-
-		while(dx++ < a) { /* fehlerhafter Abbruch bei flachen Ellipsen (b=1) */
-			gdisp_lld_draw_pixel(x+dx, y, color); /* -> Spitze der Ellipse vollenden */
-			gdisp_lld_draw_pixel(x-dx, y, color);
-	   }   
-	}
-#endif
-
-#if GDISP_NEED_ELLIPSE && !GDISP_HARDWARE_ELLIPSEFILLS
-	void gdisp_lld_fill_ellipse(coord_t x, coord_t y, coord_t a, coord_t b, color_t color) {
-		int  dx = 0, dy = b; /* im I. Quadranten von links oben nach rechts unten */
-		long a2 = a*a, b2 = b*b;
-		long err = b2-(2*b-1)*a2, e2; /* Fehler im 1. Schritt */
-
-		do {
-			gdisp_lld_draw_line(x-dx,y+dy,x+dx,y+dy, color);
-			gdisp_lld_draw_line(x-dx,y-dy,x+dx,y-dy, color);
-
-			e2 = 2*err;
-			if(e2 <  (2*dx+1)*b2) {
-				dx++;
-				err += (2*dx+1)*b2;
-			}
-			if(e2 > -(2*dy-1)*a2) {
-				dy--;
-				err -= (2*dy-1)*a2;
-			}
-		} while(dy >= 0); 
-
-		while(dx++ < a) { /* fehlerhafter Abbruch bei flachen Ellipsen (b=1) */
-			gdisp_lld_draw_pixel(x+dx, y, color); /* -> Spitze der Ellipse vollenden */
-			gdisp_lld_draw_pixel(x-dx, y, color);
-	   }   
-	}
-#endif
-
-#if GDISP_NEED_ARC && !GDISP_HARDWARE_ARCS
-
-	#include <math.h>
-
-	/*
-	 * @brief				Internal helper function for gdispDrawArc()
-	 *
-	 * @note				DO NOT USE DIRECTLY!
-	 *
-	 * @param[in] x, y		The middle point of the arc
-	 * @param[in] start		The start angle of the arc
-	 * @param[in] end		The end angle of the arc
-	 * @param[in] radius	The radius of the arc
-	 * @param[in] color		The color in which the arc will be drawn
-	 *
-	 * @notapi
-	 */
-	static void _draw_arc(coord_t x, coord_t y, uint16_t start, uint16_t end, uint16_t radius, color_t color) {
-	    if (/*start >= 0 && */start <= 180) {
-	        float x_maxI = x + radius*cos(start*M_PI/180);
-	        float x_minI;
-
-	        if (end > 180)
-	            x_minI = x - radius;
-	        else
-	            x_minI = x + radius*cos(end*M_PI/180);
-
-	        int a = 0;
-	        int b = radius;
-	        int P = 1 - radius;
-
-	        do {
-	            if(x-a <= x_maxI && x-a >= x_minI)
-	            	gdisp_lld_draw_pixel(x-a, y-b, color);
-	            if(x+a <= x_maxI && x+a >= x_minI)
-	            	gdisp_lld_draw_pixel(x+a, y-b, color);
-	            if(x-b <= x_maxI && x-b >= x_minI)
-	            	gdisp_lld_draw_pixel(x-b, y-a, color);
-	            if(x+b <= x_maxI && x+b >= x_minI)
-	            	gdisp_lld_draw_pixel(x+b, y-a, color);
-
-	            if (P < 0) {
-	                P = P + 3 + 2*a;
-	                a = a + 1;
-	            } else {
-	                P = P + 5 + 2*(a - b);
-	                a = a + 1;
-	                b = b - 1;
-	            }
-	        } while(a <= b);
-	    }
-
-	    if (end > 180 && end <= 360) {
-	        float x_maxII = x+radius*cos(end*M_PI/180);
-	        float x_minII;
-
-	        if(start <= 180)
-	            x_minII = x - radius;
-	        else
-	            x_minII = x+radius*cos(start*M_PI/180);
-
-	        int a = 0;
-	        int b = radius;
-	        int P = 1 - radius;
-
-	        do {
-	            if(x-a <= x_maxII && x-a >= x_minII)
-	            	gdisp_lld_draw_pixel(x-a, y+b, color);
-	            if(x+a <= x_maxII && x+a >= x_minII)
-	            	gdisp_lld_draw_pixel(x+a, y+b, color);
-	            if(x-b <= x_maxII && x-b >= x_minII)
-	            	gdisp_lld_draw_pixel(x-b, y+a, color);
-	            if(x+b <= x_maxII && x+b >= x_minII)
-	            	gdisp_lld_draw_pixel(x+b, y+a, color);
-
-	            if (P < 0) {
-	                P = P + 3 + 2*a;
-	                a = a + 1;
-	            } else {
-	                P = P + 5 + 2*(a - b);
-	                a = a + 1;
-	                b = b - 1;
-	            }
-	        } while (a <= b);
-	    }
-	}
-
-	void gdisp_lld_draw_arc(coord_t x, coord_t y, coord_t radius, coord_t startangle, coord_t endangle, color_t color) {
-		if(endangle < startangle) {
-	        _draw_arc(x, y, startangle, 360, radius, color);
-	        _draw_arc(x, y, 0, endangle, radius, color);
-	    } else {
-	        _draw_arc(x, y, startangle, endangle, radius, color);
-		}
-	}
-#endif
-
-#if GDISP_NEED_ARC && !GDISP_HARDWARE_ARCFILLS
-	/*
-	 * @brief				Internal helper function for gdispDrawArc()
-	 *
-	 * @note				DO NOT USE DIRECTLY!
-	 *
-	 * @param[in] x, y		The middle point of the arc
-	 * @param[in] start		The start angle of the arc
-	 * @param[in] end		The end angle of the arc
-	 * @param[in] radius	The radius of the arc
-	 * @param[in] color		The color in which the arc will be drawn
-	 *
-	 * @notapi
-	 */
-	static void _fill_arc(coord_t x, coord_t y, uint16_t start, uint16_t end, uint16_t radius, color_t color) {
-	    if (/*start >= 0 && */start <= 180) {
-	        float x_maxI = x + radius*cos(start*M_PI/180);
-	        float x_minI;
-
-	        if (end > 180)
-	            x_minI = x - radius;
-	        else
-	            x_minI = x + radius*cos(end*M_PI/180);
-
-	        int a = 0;
-	        int b = radius;
-	        int P = 1 - radius;
-
-	        do {
-	            if(x-a <= x_maxI && x-a >= x_minI)
-	            	gdisp_lld_draw_line(x, y, x-a, y-b, color);
-	            if(x+a <= x_maxI && x+a >= x_minI)
-	            	gdisp_lld_draw_line(x, y, x+a, y-b, color);
-	            if(x-b <= x_maxI && x-b >= x_minI)
-	            	gdisp_lld_draw_line(x, y, x-b, y-a, color);
-	            if(x+b <= x_maxI && x+b >= x_minI)
-	            	gdisp_lld_draw_line(x, y, x+b, y-a, color);
-
-	            if (P < 0) {
-	                P = P + 3 + 2*a;
-	                a = a + 1;
-	            } else {
-	                P = P + 5 + 2*(a - b);
-	                a = a + 1;
-	                b = b - 1;
-	            }
-	        } while(a <= b);
-	    }
-
-	    if (end > 180 && end <= 360) {
-	        float x_maxII = x+radius*cos(end*M_PI/180);
-	        float x_minII;
-
-	        if(start <= 180)
-	            x_minII = x - radius;
-	        else
-	            x_minII = x+radius*cos(start*M_PI/180);
-
-	        int a = 0;
-	        int b = radius;
-	        int P = 1 - radius;
-
-	        do {
-	            if(x-a <= x_maxII && x-a >= x_minII)
-	            	gdisp_lld_draw_line(x, y, x-a, y+b, color);
-	            if(x+a <= x_maxII && x+a >= x_minII)
-	            	gdisp_lld_draw_line(x, y, x+a, y+b, color);
-	            if(x-b <= x_maxII && x-b >= x_minII)
-	            	gdisp_lld_draw_line(x, y, x-b, y+a, color);
-	            if(x+b <= x_maxII && x+b >= x_minII)
-	            	gdisp_lld_draw_line(x, y, x+b, y+a, color);
-
-	            if (P < 0) {
-	                P = P + 3 + 2*a;
-	                a = a + 1;
-	            } else {
-	                P = P + 5 + 2*(a - b);
-	                a = a + 1;
-	                b = b - 1;
-	            }
-	        } while (a <= b);
-	    }
-	}
-
-	void gdisp_lld_fill_arc(coord_t x, coord_t y, coord_t radius, coord_t startangle, coord_t endangle, color_t color) {
-		if(endangle < startangle) {
-	        _fill_arc(x, y, startangle, 360, radius, color);
-	        _fill_arc(x, y, 0, endangle, radius, color);
-	    } else {
-	        _fill_arc(x, y, startangle, endangle, radius, color);
-		}
-	}
-#endif
-
-#if GDISP_NEED_CONTROL && !GDISP_HARDWARE_CONTROL
-	void gdisp_lld_control(unsigned what, void *value) {
-		(void)what;
-		(void)value;
-		/* Ignore everything */
-	}
-#endif
-
-#if GDISP_NEED_QUERY && !GDISP_HARDWARE_QUERY
-void *gdisp_lld_query(unsigned what) {
-	(void) what;
-	return (void *)-1;
-}
-#endif
-
-#if GDISP_NEED_MSGAPI
-	void gdisp_lld_msg_dispatch(gdisp_lld_msg_t *msg) {
-		switch(msg->action) {
-		case GDISP_LLD_MSG_NOP:
-			break;
-		case GDISP_LLD_MSG_INIT:
-			gdisp_lld_init();
-			break;
-		case GDISP_LLD_MSG_CLEAR:
-			gdisp_lld_clear(msg->clear.color);
-			break;
-		case GDISP_LLD_MSG_DRAWPIXEL:
-			gdisp_lld_draw_pixel(msg->drawpixel.x, msg->drawpixel.y, msg->drawpixel.color);
-			break;
-		case GDISP_LLD_MSG_FILLAREA:
-			gdisp_lld_fill_area(msg->fillarea.x, msg->fillarea.y, msg->fillarea.cx, msg->fillarea.cy, msg->fillarea.color);
-			break;
-		case GDISP_LLD_MSG_BLITAREA:
-			gdisp_lld_blit_area_ex(msg->blitarea.x, msg->blitarea.y, msg->blitarea.cx, msg->blitarea.cy, msg->blitarea.srcx, msg->blitarea.srcy, msg->blitarea.srccx, msg->blitarea.buffer);
-			break;
-		case GDISP_LLD_MSG_DRAWLINE:
-			gdisp_lld_draw_line(msg->drawline.x0, msg->drawline.y0, msg->drawline.x1, msg->drawline.y1, msg->drawline.color);
-			break;
-		#if GDISP_NEED_CLIP
-			case GDISP_LLD_MSG_SETCLIP:
-				gdisp_lld_set_clip(msg->setclip.x, msg->setclip.y, msg->setclip.cx, msg->setclip.cy);
-				break;
-		#endif
-		#if GDISP_NEED_CIRCLE
-			case GDISP_LLD_MSG_DRAWCIRCLE:
-				gdisp_lld_draw_circle(msg->drawcircle.x, msg->drawcircle.y, msg->drawcircle.radius, msg->drawcircle.color);
-				break;
-			case GDISP_LLD_MSG_FILLCIRCLE:
-				gdisp_lld_fill_circle(msg->fillcircle.x, msg->fillcircle.y, msg->fillcircle.radius, msg->fillcircle.color);
-				break;
-		#endif
-		#if GDISP_NEED_ELLIPSE
-			case GDISP_LLD_MSG_DRAWELLIPSE:
-				gdisp_lld_draw_ellipse(msg->drawellipse.x, msg->drawellipse.y, msg->drawellipse.a, msg->drawellipse.b, msg->drawellipse.color);
-				break;
-			case GDISP_LLD_MSG_FILLELLIPSE:
-				gdisp_lld_fill_ellipse(msg->fillellipse.x, msg->fillellipse.y, msg->fillellipse.a, msg->fillellipse.b, msg->fillellipse.color);
-				break;
-		#endif
-		#if GDISP_NEED_ARC
-			case GDISP_LLD_MSG_DRAWARC:
-				gdisp_lld_draw_circle(msg->drawarc.x, msg->drawarc.y, msg->drawarc.radius, msg->drawarc.startangle, msg->drawarc.endangle, msg->drawarc.color);
-				break;
-			case GDISP_LLD_MSG_FILLARC:
-				gdisp_lld_fill_circle(msg->fillarc.x, msg->fillarc.y, msg->fillarc.radius, msg->fillarc.startangle, msg->fillarc.endangle, msg->fillarc.color);
-				break;
-		#endif
-		#if GDISP_NEED_PIXELREAD
-			case GDISP_LLD_MSG_GETPIXELCOLOR:
-				msg->getpixelcolor.result = gdisp_lld_get_pixel_color(msg->getpixelcolor.x, msg->getpixelcolor.y);
-				break;
-		#endif
-		#if GDISP_NEED_SCROLL
-			case GDISP_LLD_MSG_VERTICALSCROLL:
-				gdisp_lld_vertical_scroll(msg->verticalscroll.x, msg->verticalscroll.y, msg->verticalscroll.cx, msg->verticalscroll.cy, msg->verticalscroll.lines, msg->verticalscroll.bgcolor);
-				break;
-		#endif
-		#if GDISP_NEED_CONTROL
-			case GDISP_LLD_MSG_CONTROL:
-				gdisp_lld_control(msg->control.what, msg->control.value);
-				break;
-		#endif
-		#if GDISP_NEED_QUERY
-			case GDISP_LLD_MSG_QUERY:
-				msg->query.result = gdisp_lld_query(msg->query.what);
-				break;
-		#endif
-		}
-	}
-#endif
-
-#endif  /* GFX_USE_GDISP */
-#endif	/* GDISP_EMULATION_C */
-/** @} */
-
diff --git a/include/gdisp/lld/gdisp_lld.h b/include/gdisp/lld/gdisp_lld.h
index 98c7569c..46d5488a 100644
--- a/include/gdisp/lld/gdisp_lld.h
+++ b/include/gdisp/lld/gdisp_lld.h
@@ -27,83 +27,54 @@
  * @{
  */
 	/**
-	 * @brief   Hardware accelerated line drawing.
+	 * @brief   Hardware streaming interface is supported.
 	 * @details If set to @p FALSE software emulation is used.
+	 * @note	Either GDISP_HARDWARE_STREAM or GDISP_HARDWARE_DRAWPIXEL must be provided by the driver
 	 */
-	#ifndef GDISP_HARDWARE_LINES
-		#define GDISP_HARDWARE_LINES			FALSE
+	#ifndef GDISP_HARDWARE_STREAM
+		#define GDISP_HARDWARE_STREAM			FALSE
 	#endif
 
 	/**
-	 * @brief   Hardware accelerated screen clears.
-	 * @details If set to @p FALSE software emulation is used.
-	 */
-	#ifndef GDISP_HARDWARE_CLEARS
-		#define GDISP_HARDWARE_CLEARS			FALSE
-	#endif
-
-	/**
-	 * @brief   Hardware accelerated rectangular fills.
-	 * @details If set to @p FALSE software emulation is used.
-	 */
-	#ifndef GDISP_HARDWARE_FILLS
-		#define GDISP_HARDWARE_FILLS			FALSE
-	#endif
-
-	/**
-	 * @brief   Hardware accelerated fills from an image.
-	 * @details If set to @p FALSE software emulation is used.
-	 */
-	#ifndef GDISP_HARDWARE_BITFILLS
-		#define GDISP_HARDWARE_BITFILLS			FALSE
-	#endif
-
-	/**
-	 * @brief   Hardware accelerated circles.
-	 * @details If set to @p FALSE software emulation is used.
-	 */
-	#ifndef GDISP_HARDWARE_CIRCLES
-		#define GDISP_HARDWARE_CIRCLES			FALSE
-	#endif
-
-	/**
-	 * @brief   Hardware accelerated filled circles.
-	 * @details If set to @p FALSE software emulation is used.
+	 * @brief   Hardware streaming requires an explicit end call.
+	 * @details If set to @p FALSE if an explicit stream end call is not required.
 	 */
-	#ifndef GDISP_HARDWARE_CIRCLEFILLS
-		#define GDISP_HARDWARE_CIRCLEFILLS		FALSE
+	#ifndef GDISP_HARDWARE_STREAM_END
+		#define GDISP_HARDWARE_STREAM_END		FALSE
 	#endif
 
 	/**
-	 * @brief   Hardware accelerated ellipses.
+	 * @brief   Hardware accelerated draw pixel.
 	 * @details If set to @p FALSE software emulation is used.
+	 * @note	Either GDISP_HARDWARE_STREAM or GDISP_HARDWARE_DRAWPIXEL must be provided by the driver
 	 */
-	#ifndef GDISP_HARDWARE_ELLIPSES
-		#define GDISP_HARDWARE_ELLIPSES			FALSE
+	#ifndef GDISP_HARDWARE_DRAWPIXEL
+		#define GDISP_HARDWARE_DRAWPIXEL		FALSE
 	#endif
 
 	/**
-	 * @brief   Hardware accelerated filled ellipses.
+	 * @brief   Hardware accelerated screen clears.
 	 * @details If set to @p FALSE software emulation is used.
+	 * @note	This clears the entire display surface regardless of the clipping area currently set
 	 */
-	#ifndef GDISP_HARDWARE_ELLIPSEFILLS
-		#define GDISP_HARDWARE_ELLIPSEFILLS		FALSE
+	#ifndef GDISP_HARDWARE_CLEARS
+		#define GDISP_HARDWARE_CLEARS			FALSE
 	#endif
 
 	/**
-	 * @brief   Hardware accelerated arc's.
+	 * @brief   Hardware accelerated rectangular fills.
 	 * @details If set to @p FALSE software emulation is used.
 	 */
-	#ifndef GDISP_HARDWARE_ARCS
-		#define GDISP_HARDWARE_ARCS			FALSE
+	#ifndef GDISP_HARDWARE_FILLS
+		#define GDISP_HARDWARE_FILLS			FALSE
 	#endif
 
 	/**
-	 * @brief   Hardware accelerated filled arcs.
+	 * @brief   Hardware accelerated fills from an image.
 	 * @details If set to @p FALSE software emulation is used.
 	 */
-	#ifndef GDISP_HARDWARE_ARCFILLS
-		#define GDISP_HARDWARE_ARCFILLS		FALSE
+	#ifndef GDISP_HARDWARE_BITFILLS
+		#define GDISP_HARDWARE_BITFILLS			FALSE
 	#endif
 
 	/**
@@ -141,9 +112,14 @@
 	/**
 	 * @brief   The driver supports a clipping in hardware.
 	 * @details If set to @p FALSE there is no support for non-standard queries.
+	 * @note	If this is defined the driver must perform its own clipping on all calls to
+	 * 			the driver and respond appropriately if a parameter is outside the display area.
+	 * @note	If this is not defined then the software ensures that all calls to the
+	 * 			driver do not exceed the display area (provided GDISP_NEED_CLIP or GDISP_NEED_VALIDATION
+	 * 			has been set).
 	 */
 	#ifndef GDISP_HARDWARE_CLIP
-		#define GDISP_HARDWARE_CLIP			FALSE
+		#define GDISP_HARDWARE_CLIP				FALSE
 	#endif
 /** @} */
 
@@ -161,6 +137,7 @@
 	 * @brief   The native pixel format for this device
 	 * @note	Should be set to one of the following:
 	 *				GDISP_PIXELFORMAT_RGB565
+	 *				GDISP_PIXELFORMAT_BGR565
 	 *				GDISP_PIXELFORMAT_RGB888
 	 *				GDISP_PIXELFORMAT_RGB444
 	 *				GDISP_PIXELFORMAT_RGB332
@@ -208,76 +185,85 @@
 /* External declarations.                                                    */
 /*===========================================================================*/
 
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-	/* Core functions */
-	extern bool_t gdisp_lld_init(void);
-
-	/* Some of these functions will be implemented in software by the high level driver
-	   depending on the GDISP_HARDWARE_XXX macros defined in gdisp_lld_config.h.
-	 */
+typedef struct GDISPDriver {
+	GDISPControl			g;
 
-	/* Drawing functions */
-	extern void gdisp_lld_clear(color_t color);
-	extern void gdisp_lld_draw_pixel(coord_t x, coord_t y, color_t color);
-	extern void gdisp_lld_fill_area(coord_t x, coord_t y, coord_t cx, coord_t cy, color_t color);
-	extern void gdisp_lld_blit_area_ex(coord_t x, coord_t y, coord_t cx, coord_t cy, coord_t srcx, coord_t srcy, coord_t srccx, const pixel_t *buffer);
-	extern void gdisp_lld_draw_line(coord_t x0, coord_t y0, coord_t x1, coord_t y1, color_t color);
-
-	/* Circular Drawing Functions */
-	#if GDISP_NEED_CIRCLE
-	extern void gdisp_lld_draw_circle(coord_t x, coord_t y, coord_t radius, color_t color);
-	extern void gdisp_lld_fill_circle(coord_t x, coord_t y, coord_t radius, color_t color);
-	#endif
+	uint16_t				flags;
+		#define GDISP_FLG_INSTREAM		0x0001
 
-	#if GDISP_NEED_ELLIPSE
-	extern void gdisp_lld_draw_ellipse(coord_t x, coord_t y, coord_t a, coord_t b, color_t color);
-	extern void gdisp_lld_fill_ellipse(coord_t x, coord_t y, coord_t a, coord_t b, color_t color);
+	// Multithread Mutex
+	#if GDISP_NEED_MULTITHREAD
+		gfxMutex			mutex;
 	#endif
 
-	/* Arc Drawing Functions */
-	#if GDISP_NEED_ARC
-	extern void gdisp_lld_draw_arc(coord_t x, coord_t y, coord_t radius, coord_t startangle, coord_t endangle, color_t color);
-	extern void gdisp_lld_fill_arc(coord_t x, coord_t y, coord_t radius, coord_t startangle, coord_t endangle, color_t color);
+	// Software clipping
+	#if !GDISP_HARDWARE_CLIP && (GDISP_NEED_CLIP || GDISP_NEED_VALIDATION)
+		coord_t				clipx0, clipy0;
+		coord_t				clipx1, clipy1;		/* not inclusive */
 	#endif
 
-	/* Text Rendering Functions */
+	// Driver call parameters
+	struct {
+		coord_t			x, y;
+		coord_t			cx, cy;
+		coord_t			x1, y1;
+		coord_t			x2, y2;
+		color_t			color;
+		void			*ptr;
+	} p;
+
+	// Text rendering parameters
 	#if GDISP_NEED_TEXT
-	extern void gdisp_lld_draw_char(coord_t x, coord_t y, uint16_t c, font_t font, color_t color);
-	extern void gdisp_lld_fill_char(coord_t x, coord_t y, uint16_t c, font_t font, color_t color, color_t bgcolor);
+		struct {
+			font_t		font;
+			color_t		color;
+			color_t		bgcolor;
+			coord_t		clipx0, clipy0;
+			coord_t		clipx1, clipy1;
+		} t;
 	#endif
+} GDISPDriver;
 
-	/* Pixel readback */
-	#if GDISP_NEED_PIXELREAD
-	extern color_t gdisp_lld_get_pixel_color(coord_t x, coord_t y);
-	#endif
+extern GDISPDriver	GDISP_DRIVER_STRUCT;
 
-	/* Scrolling Function - clears the area scrolled out */
-	#if GDISP_NEED_SCROLL
-	extern void gdisp_lld_vertical_scroll(coord_t x, coord_t y, coord_t cx, coord_t cy, int lines, color_t bgcolor);
-	#endif
+#ifdef __cplusplus
+extern "C" {
+#endif
 
-	/* Set driver specific control */
-	#if GDISP_NEED_CONTROL
-	extern void gdisp_lld_control(unsigned what, void *value);
+	bool_t gdisp_lld_init(void);
+	#if GDISP_HARDWARE_STREAM
+		void gdisp_lld_stream_start(void);		// Uses p.x,p.y  p.cx,p.cy
+		void gdisp_lld_stream_color(void);		// Uses p.color
+		#if GDISP_HARDWARE_STREAM_END
+			void gdisp_lld_stream_stop(void);	// Uses no parameters
+		#endif
 	#endif
-
-	/* Query driver specific data */
-	#if GDISP_NEED_QUERY
-	extern void *gdisp_lld_query(unsigned what);
+	#if GDISP_HARDWARE_DRAWPIXEL
+		void gdisp_lld_draw_pixel(void);		// Uses p.x,p.y  p.color
 	#endif
-
-	/* Clipping Functions */
-	#if GDISP_NEED_CLIP
-	extern void gdisp_lld_set_clip(coord_t x, coord_t y, coord_t cx, coord_t cy);
+	#if GDISP_HARDWARE_CLEARS
+		void gdisp_lld_clear(void);				// Uses p.color
 	#endif
-
-	/* Messaging API */
-	#if GDISP_NEED_MSGAPI
-	#include "gdisp_lld_msgs.h"
-	extern void gdisp_lld_msg_dispatch(gdisp_lld_msg_t *msg);
+	#if GDISP_HARDWARE_FILLS
+		void gdisp_lld_fill_area(void);			// Uses p.x,p.y  p.cx,p.cy  p.color
+	#endif
+	#if GDISP_HARDWARE_BITFILLS
+		void gdisp_lld_blit_area_ex(void);		// Uses p.x,p.y  p.cx,p.cy  p.x1,p.y1 (=srcx,srcy)  p.x2 (=srccx), p.ptr (=buffer)
+	#endif
+	#if GDISP_HARDWARE_PIXELREAD && GDISP_NEED_PIXELREAD
+		color_t gdisp_lld_get_pixel_color(void);	// Uses p.x,p.y
+	#endif
+	#if GDISP_HARDWARE_SCROLL && GDISP_NEED_SCROLL
+		void gdisp_lld_vertical_scroll(void);	// Uses p.x,p.y  p.cx,p.cy, p.y1 (=lines) p.color
+	#endif
+	#if GDISP_HARDWARE_CONTROL && GDISP_NEED_CONTROL
+		void gdisp_lld_control(void);			// Uses p.x (=what)  p.ptr (=value)
+	#endif
+	#if GDISP_HARDWARE_QUERY && GDISP_NEED_QUERY
+		void *gdisp_lld_query(void);			// Uses p.x (=what);
+	#endif
+	#if GDISP_HARDWARE_CLIP && (GDISP_NEED_CLIP || GDISP_NEED_VALIDATION)
+		void gdisp_lld_set_clip(void);			// Uses p.x,p.y  p.cx,p.cy
 	#endif
 
 #ifdef __cplusplus