X-Git-Url: https://hackdaworld.org/gitweb/?a=blobdiff_plain;f=betty%2Fdisplay.c;h=ce8fd7c1aeca22236c863598c9b64fb350360b3b;hb=71bf7666ce24cd3c07bb16648e0ab231e07be6d8;hp=b3d3e9c89ff27d6c7d87d28c1da176f76f06354d;hpb=800e17e9826d024a38edb45b59de7953394002d2;p=my-code%2Farm.git

diff --git a/betty/display.c b/betty/display.c
index b3d3e9c..ce8fd7c 100644
--- a/betty/display.c
+++ b/betty/display.c
@@ -5,6 +5,17 @@
  *
  */
 
+/*
+ * some comments on alpha blending!
+ * ################################
+ *
+ * if c is the result of layer a over layer b with opacity alpha:
+ * 
+ * c=alpha*a+(1-alpha)*b and if alpha is a byte (0-255)
+ * => c=alpha*a+(255-alpha)*b
+ * 
+ */
+
 #include "display.h"
 #include "system.h"
 #include "default_logo.h"
@@ -17,55 +28,64 @@
 void display_fill_screen(u8 fill) {
 
 	u8 page,width;
+	u8 buf[2];
+
+	buf[0]=0;
+	buf[1]=0;
+
+	switch(fill) {
+		case DISPLAY_FILL_LG:
+			buf[1]=0xff;
+			break;
+		case DISPLAY_FILL_DG:
+			buf[0]=0xff;
+			break;
+		case DISPLAY_FILL_B:
+			buf[0]=0xff;
+			buf[1]=0xff;
+			break;
+		case DISPLAY_FILL_W:
+		default:
+			break;
+	}
 
 	for(page=0;page<DISPLAY_PAGE_MAX;page++) {
 		DISPLAY_SET_C_ADDR(0);
 		DISPLAY_SET_PAGE_ADDR(page);
 		for(width=0;width<DISPLAY_DIMX;width++) {
-			DISPLAY_DATA=fill;
-			DISPLAY_DATA=fill;
+			DISPLAY_DATA=buf[0];
+			DISPLAY_DATA=buf[1];
 		}
 	}
 }
 
 void display_clear_screen(void) {
 
-	display_fill_screen(0x00);
+	display_fill_screen(DISPLAY_FILL_W);
 }
 
 void display_init(void) {
 
-	DISPLAY_EXIT_POWER_SAVE;
-
-	DISPLAY_SOFT_RESET;
-	pause(0xffffff);
-
+	/* oscillator, regulator, boost, opamp, contrast */
 	DISPLAY_START_OSCILLATOR;
-
 	DISPLAY_SET_REGULATOR(7);
-
 	DISPLAY_SET_CONTRAST(0x38);
-
 	DISPLAY_SET_CONV_FACTOR(0x01);
-
-	DISPLAY_SET_PWM_FRC(0,0);
+	DISPLAY_SET_POWER(DISPLAY_V_BOOST|DISPLAY_REGULATOR|DISPLAY_OPAMP);
 
 	// gray scale palette
 	DISPLAY_SET_WHITE(0,0,0,0);
-	DISPLAY_SET_LGRAY(2,2,2,2);
-	DISPLAY_SET_DGRAY(6,6,6,6);
+	DISPLAY_SET_LGRAY(5,5,5,5);	// obviously 3, but it's too bright!
+	DISPLAY_SET_DGRAY(7,7,7,7);	// obviously 6, but again too bright!
 	DISPLAY_SET_BLACK(9,9,9,9);
 
-	DISPLAY_SET_POWER(DISPLAY_REGULATOR|DISPLAY_OPAMP);
-	pause(0xffffff);
-	DISPLAY_SET_POWER(DISPLAY_V_BOOST|DISPLAY_REGULATOR|DISPLAY_OPAMP);
-	
+	/* normal mode, display depending ram content */
 	DISPLAY_RAM_CONTENTS_ON;
-
-	DISPLAY_NORMAL;
-
 	display_clear_screen();
+	DISPLAY_NORMAL;			// 00 -> white, 11 -> black
+	DISPLAY_SET_COM_ODIR_REMAPPED;	// start counting at the top
 
+	/* switch on the display */
 	DISPLAY_SET_ON;
 }
 
@@ -73,24 +93,70 @@ void display_load_logo(u8 *src) {
 
 	u8 *s;
 	u8 page,width;
-	u32 cnt;
 
 	s=src;
 	if(s==0)
 		s=default_logo;
 
-	cnt=0;
 	for(page=0;page<DISPLAY_PAGE_MAX;page++) {
 		DISPLAY_SET_C_ADDR(0);
 		DISPLAY_SET_PAGE_ADDR(page);
 		for(width=0;width<DISPLAY_DIMX;width++) {
-			DISPLAY_DATA=s[cnt];
-			DISPLAY_DATA=s[cnt+1];
-			cnt+=2;
+			DISPLAY_DATA=*s++;
+			DISPLAY_DATA=*s++;
 		}
 	}
 }
 
+#define display_m2i(m,r) (((((m)[0]>>r)&1)<<1)|(((m)[1]>>r)&1))
+
+void display_draw_rectangle(u8 x,u8 y,u8 w,u8 h,u8 fill,u8 alpha) {
+
+	u8 page,col,row,rmax,cnt;
+	u8 d[2];
+	int ca,cb;
+	u8 a,b,c;			// c = a over b
+
+	a=fill&0x03;
+	ca=0;
+	for(cnt=0;cnt<a;cnt++)		// contribution of a: alpha*a
+		ca+=alpha;
+
+	for(page=(y>>3);page<=((y+h)>>3);page++) {	// page = y/8
+		DISPLAY_SET_PAGE_ADDR(page);
+		rmax=(page+1)<<3;			// row max
+		if(rmax>y+h)
+			rmax=y+h;
+		for(col=x;col<x+w;col++) {
+			DISPLAY_SET_C_ADDR(col);
+			d[0]=DISPLAY_DATA;		// dummy read (p.16)
+			d[0]=DISPLAY_DATA;
+			d[1]=DISPLAY_DATA;
+			for(row=y;row<rmax;row++) {
+				// contribution of b: (255-alpha)*b
+				b=display_m2i(d,row);
+				cb=0;
+				for(cnt=0;cnt<b;cnt++)
+					cb+=(255-alpha);
+				// finally there is c
+				c=(ca+cb)>>8;
+				d[0]&=~(1<<row);
+				d[1]&=~(1<<row);
+				d[0]|=((c>>1)&1)<<row;
+				d[1]|=(c&1)<<row;
+			}
+			DISPLAY_SET_C_ADDR(col);
+			DISPLAY_DATA=b[0];
+			DISPLAY_DATA=b[1];
+		}
+		y=rmax;
+	}
+}
+
+void display_draw_buf(u8 x,u8 y,u8 w,u8 h,u8 *buf,u8 alpha) {
+
+}
+
 void display_bl_init(void) {
 
 	IODIR0|=(1<<4);