1 files changed, 305 insertions, 0 deletions

diff --git a/src/target/firmware/fb/fb_rgb332.c b/src/target/firmware/fb/fb_rgb332.c
new file mode 100644
index 00000000..08d64e13
--- /dev/null
+++ b/src/target/firmware/fb/fb_rgb332.c
@@ -0,0 +1,305 @@
+/* utility functions for a color framebuffer organized
+   as one pixel per byte, with bits mapped as RRRGGGBB.
+   This matches the SSD1783 LC Display Controller used
+   on the Motorola C155 */
+
+/* (C) 2010 by Christian Vogel <vogelchr@vogel.cx>
+ *
+ * All Rights Reserved
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+
+#include <fb/framebuffer.h>
+#include <fb/fb_rgb332.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+void
+fb_rgb332_clear(){
+	int i,n;
+	
+	/* bytes to clear */
+	n = framebuffer->height * framebuffer->width;
+	for(i=0;i<n;i++)
+		fb_rgb332->mem[i]=0xff; /* white */
+
+	/* mark everything as dirty */
+	fb_rgb332->damage_x1 = 0;
+	fb_rgb332->damage_x2 = framebuffer->width;
+	fb_rgb332->damage_y1 = 0;
+	fb_rgb332->damage_y2 = framebuffer->height;
+}
+
+/* update damage rectangle to include the area
+   x1,y1 (upper left) to x2,y2 (lower right)
+   Note that all pixels *including* x1y2 and x2y2 are
+   marked as dirty */
+static void
+fb_rgb332_update_damage(
+	uint16_t x1,uint16_t y1, /* left upper corner (inclusive) */
+	uint16_t x2,uint16_t y2  /* right lower corner (inclusive) */
+){
+	fb_sanitize_box(&x1,&y1,&x2,&y2);
+	
+	x2++; /* see definition of fb_rgb332->damage_x2/y2 */
+	y2++;
+
+	/* maybe currently everything is clean? */
+	if(fb_rgb332->damage_x1 == fb_rgb332->damage_x2 ||
+	   fb_rgb332->damage_y1 == fb_rgb332->damage_y2
+	){
+			fb_rgb332->damage_x1 = x1;
+			fb_rgb332->damage_y1 = y1;
+			fb_rgb332->damage_x2 = x2;
+			fb_rgb332->damage_y2 = y2;
+			return;
+	}
+
+	/* grow damage box */
+	if(x1 < fb_rgb332->damage_x1)
+		fb_rgb332->damage_x1 = x1;
+	if(y1 < fb_rgb332->damage_y1)
+		fb_rgb332->damage_y1 = y1;
+	if(x2 > fb_rgb332->damage_x2)
+		fb_rgb332->damage_x2 = x2;
+	if(y2 > fb_rgb332->damage_y2)
+		fb_rgb332->damage_y2 = y2;
+#if 0
+	printf("%s: damage now %d %d %d %d\n",
+	       __FUNCTION__,fb_rgb332->damage_x1,fb_rgb332->damage_y1,
+	       fb_rgb332->damage_x2,fb_rgb332->damage_y2);
+#endif
+}
+
+/* we trust gcc to move this expensive bitshifting out of
+   the loops in the drawing funtcions */
+static uint8_t rgb_to_pixel(uint32_t color){
+	uint8_t ret;
+	ret  = (FB_COLOR_TO_R(color) & 0xe0);      /* 765 = RRR */
+	ret |= (FB_COLOR_TO_G(color) & 0xe0) >> 3; /* 432 = GGG */
+	ret |= (FB_COLOR_TO_B(color) & 0xc0) >> 6; /*  10 =  BB */
+	return ret;
+}
+
+static void set_pix(uint8_t *pixel,uint32_t color){
+	if(color == FB_COLOR_TRANSP)
+		return;
+	*pixel = rgb_to_pixel(color);
+}
+
+static void set_fg(uint8_t *pixel){
+	set_pix(pixel,framebuffer->fg_color);
+}
+
+static void set_bg(uint8_t *pixel){
+	set_pix(pixel,framebuffer->bg_color);
+}
+
+void fb_rgb332_boxto(uint16_t x2,uint16_t y2)
+{
+	uint16_t x1 = framebuffer->cursor_x;
+	uint16_t y1 = framebuffer->cursor_y;
+	int x,y;
+	uint8_t *p;
+
+	framebuffer->cursor_x = x2;
+	framebuffer->cursor_y = y2;
+	
+	fb_sanitize_box(&x1,&y1,&x2,&y2);
+	fb_rgb332_update_damage(x1,y1,x2,y2);
+
+	for(y=y1; y<=y2; y++){
+		p = & fb_rgb332->mem[x1 + framebuffer->width * y];
+		for(x=x1;x<=x2;x++){
+			set_bg(p);
+			if(y==y1 || y==y2 || x==x1 || x==x2) /* border */
+				set_fg(p);
+			p++;
+		}
+	}
+}
+
+/* draw a line like Brensenham did... (roughly) */
+void fb_rgb332_lineto(uint16_t x2,uint16_t y2){
+	uint8_t *p,pixel;	/* framebuffer pointer */
+	int delta_regular;	/* framebuffer offset per step */
+	int delta_step;		/* " */
+
+	uint16_t x1 = framebuffer->cursor_x; /* start */
+	uint16_t y1 = framebuffer->cursor_y;
+
+	int t,tmax;		/* counter for steps */
+	int err_inc,err_accu=0;	/* error delta and accumulator for */
+				/* Brensenham's algorhithm */
+
+	fb_limit_fb_range(&x1,&y1);
+	fb_limit_fb_range(&x2,&y2);
+	fb_rgb332_update_damage(x1,y1,x2,y2);
+
+	framebuffer->cursor_x = x2; /* end pixel */
+	framebuffer->cursor_y = y2;
+
+	/* pointer to first pixel, pixel value in FB memory */
+	p = fb_rgb332->mem + framebuffer->width * y1 + x1;
+	pixel = rgb_to_pixel(framebuffer->fg_color);
+
+	if(abs(x2-x1) >= abs(y2-y1)){ /* shallow line */
+		/* set pointer deltas for directions */
+		delta_regular = 1;		    /* X */
+		if(x2 < x1)
+			delta_regular = -delta_regular;
+		delta_step = framebuffer->width;    /* Y */
+		if(y2 < y1)
+			delta_step = -delta_step;
+		tmax = abs(x2-x1);
+		err_inc = abs(y2-y1);
+	} else { /* steep line */
+		delta_regular = framebuffer->width; /* Y */
+		if(y2 < y1)
+			delta_regular = -delta_regular;
+		delta_step = 1; 		    /* X */
+		if(x2 < x1)
+			delta_step = -1;
+		tmax = abs(y2-y1);
+		err_inc = abs(x2-y1);
+	}
+
+#if 0
+	printf("%s: (%d,%d) -> (%d,%d) step=%d regular=%d err_inc=%d tmax=%d\n",
+	       __FUNCTION__,x1,y1,x2,y2,delta_step,delta_regular,err_inc,tmax);
+#endif
+
+	for(t=0;t<=tmax;t++){
+		*p = pixel;
+		err_accu += err_inc;
+		if(err_accu >= tmax){
+			p += delta_step;
+			err_accu -= tmax;
+		}
+		p += delta_regular;
+	}
+}
+
+int fb_rgb332_putstr(char *str,int maxwidth){
+	const struct fb_font *font = fb_fonts[framebuffer->font];
+	const struct fb_char *fchr;
+
+	int x1,y1,x2,y2; 		// will become bounding box
+	int y;				// coordinates in display
+	int char_x=0,char_y;		// coordinates in font character
+	int bitmap_x,bitmap_y;		// coordinates in character's bitmap
+	int byte_per_line;		// depending on character width in font
+	int bitmap_offs,bitmap_bit;	// offset inside bitmap, bit number of pixel
+	uint8_t *p,fgpixel,bgpixel,trans; // pointer into framebuffer memory
+	int total_w;			// total width
+
+	/* center, if maxwidth < 0 */
+	if (maxwidth < 0) {
+		total_w = 0;
+		/* count width of string */
+		for(p=(uint8_t *)str;*p;p++){
+			fchr = fb_font_get_char(font,*p);
+			if(!fchr)  /* FIXME: Does '?' exist in every font? */
+				fchr = fb_font_get_char(font,'?');
+			total_w += fchr->width;
+
+		} // str
+		if (total_w <= framebuffer->width)
+			framebuffer->cursor_x =
+				(framebuffer->width - total_w) >> 1;
+		else
+			framebuffer->cursor_x = 1;
+		maxwidth = framebuffer->width;
+	}
+
+	x1 = framebuffer->cursor_x;	// first col (incl!)
+	x2 = x1 + maxwidth - 1;		// last col (incl!)
+	if(x2 >= framebuffer->width)
+		x2 = framebuffer->width - 1;
+
+	y1 = framebuffer->cursor_y - font->ascent + 1; // first row
+	y2 = y1 + font->height - 1;	// last row
+
+	fgpixel = rgb_to_pixel(framebuffer->fg_color);
+	bgpixel = rgb_to_pixel(framebuffer->bg_color);
+	trans = (framebuffer->bg_color == FB_COLOR_TRANSP);
+
+	if(y1 < 0)			// sanitize in case of overflow
+		y1 = 0;
+	if(y2 >= framebuffer->height)
+		y2 = framebuffer->height - 1;
+
+	/* iterate over all characters */
+	for(;*str && framebuffer->cursor_x <= x2;str++){
+		fchr = fb_font_get_char(font,*str);
+		if(!fchr)  /* FIXME: Does '?' exist in every font? */
+			fchr = fb_font_get_char(font,'?');
+		if(!fchr)
+			return 0;
+		byte_per_line = (fchr->bbox_w+7)/8;
+
+		for(y=y1;y<=y2;y++){
+			p=fb_rgb332->mem+y*framebuffer->width;
+			p+=framebuffer->cursor_x;
+
+			for(char_x=0;
+			    char_x<fchr->width &&
+			    char_x+framebuffer->cursor_x <= x2;
+			    char_x++
+			){
+				/* bitmap coordinates, X= left to right */
+				bitmap_x = char_x - fchr->bbox_x;
+				/* character coords. Y increases from
+				   cursor upwards */
+				char_y = framebuffer->cursor_y-y;
+				/* bitmap index = height-(bitmap coords)-1 */
+				bitmap_y = fchr->bbox_h -
+					(char_y - fchr->bbox_y) - 1;
+
+				/* outside pixel data of this
+				   character? */
+				if(bitmap_x < 0 ||
+				   bitmap_x >= fchr->bbox_w ||
+				   bitmap_y < 0 ||
+				   bitmap_y >= fchr->bbox_h
+				)
+					goto outside_char_bitmap;
+
+				/* check bit in pixel data for
+				   this character */
+				bitmap_offs=bitmap_x/8+bitmap_y*byte_per_line;
+				bitmap_bit=7-(bitmap_x%8);
+
+				/* bit is set  */
+				if(fchr->data[bitmap_offs]&(1<<bitmap_bit)){
+					*p = fgpixel;
+				} else { // unset, or outside bitmap
+outside_char_bitmap:
+					if (!trans)
+						*p = bgpixel;
+				}
+				p++;
+			} // for(x...)
+		} // for(char_x...)
+		framebuffer->cursor_x += char_x;
+	} // str
+
+	x2 = framebuffer->cursor_x;
+	fb_rgb332_update_damage(x1,y1,x2,y2);
+	return x2-x1;
+}
+