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Diffstat (limited to 'src/target/firmware/fb/fb_bw8.c')
-rw-r--r--src/target/firmware/fb/fb_bw8.c311
1 files changed, 311 insertions, 0 deletions
diff --git a/src/target/firmware/fb/fb_bw8.c b/src/target/firmware/fb/fb_bw8.c
new file mode 100644
index 00000000..ffb59d81
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+++ b/src/target/firmware/fb/fb_bw8.c
@@ -0,0 +1,311 @@
+/* utility functions for a black-and-white framebuffer organized
+ as 8-vertically-stacked-pixels per byte. This matches the
+ ST7558 LC Display Controller used on the Motorola C123 */
+
+/* (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_bw8.h>
+
+#include <stdio.h> // debugging
+
+void fb_bw8_clear(){
+ int i,n;
+
+ /* bytes to clear */
+ n = (framebuffer->height+7)/8 * framebuffer->width;
+ for(i=0;i<n;i++)
+ fb_bw8->mem[i]=0;
+
+ /* mark everything as dirty */
+ fb_bw8->damage_x1 = 0;
+ fb_bw8->damage_x2 = framebuffer->width;
+ fb_bw8->damage_y1 = 0;
+ fb_bw8->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_bw8_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_bw8->damage_x2/y2 */
+ y2++;
+
+ /* maybe currently everything is clean? */
+ if(fb_bw8->damage_x1 == fb_bw8->damage_x2 ||
+ fb_bw8->damage_y1 == fb_bw8->damage_y2){
+ fb_bw8->damage_x1 = x1;
+ fb_bw8->damage_y1 = y1;
+ fb_bw8->damage_x2 = x2;
+ fb_bw8->damage_y2 = y2;
+/*
+ printf("%s: was clean! damage now %d %d %d %d\n",
+ __FUNCTION__,fb_bw8->damage_x1,fb_bw8->damage_y1,
+ fb_bw8->damage_x2,fb_bw8->damage_y2);
+*/
+ return;
+ }
+
+ /* grow damage box */
+ if(x1 < fb_bw8->damage_x1)
+ fb_bw8->damage_x1 = x1;
+ if(y1 < fb_bw8->damage_y1)
+ fb_bw8->damage_y1 = y1;
+ if(x2 > fb_bw8->damage_x2)
+ fb_bw8->damage_x2 = x2;
+ if(y2 > fb_bw8->damage_y2)
+ fb_bw8->damage_y2 = y2;
+#if 0
+ printf("%s: damage now %d %d %d %d\n",
+ __FUNCTION__,fb_bw8->damage_x1,fb_bw8->damage_y1,
+ fb_bw8->damage_x2,fb_bw8->damage_y2);
+#endif
+}
+
+static void fb_bw8_line(uint16_t x1,uint16_t y1,uint16_t x2,uint16_t y2){
+ fb_sanitize_box(&x1,&y1,&x2,&y2);
+ /* FIXME : this is currently unimplemented! */
+}
+
+void fb_bw8_lineto(uint16_t x,uint16_t y){
+ fb_bw8_line(framebuffer->cursor_x,framebuffer->cursor_y,x,y);
+ framebuffer->cursor_x = x;
+ framebuffer->cursor_y = y;
+}
+
+/* depending on color set (add to or_mask) or clear
+ (remove from and_mask) bit number bitnum */
+static void set_pixel(uint8_t *and_mask,
+ uint8_t *or_mask,
+ int bitnum,
+ uint32_t color
+){
+ if(color == FB_COLOR_TRANSP)
+ return;
+ if(color == FB_COLOR_WHITE)
+ *and_mask &= ~(1<<bitnum);
+ else
+ *or_mask |= 1<<bitnum;
+}
+
+static void set_fg_pixel(uint8_t *and_mask,uint8_t *or_mask,int bitnum){
+ set_pixel(and_mask,or_mask,bitnum,framebuffer->fg_color);
+}
+
+static void set_bg_pixel(uint8_t *and_mask,uint8_t *or_mask,int bitnum){
+ set_pixel(and_mask,or_mask,bitnum,framebuffer->bg_color);
+}
+
+static void fb_bw8_box(uint16_t x1,uint16_t y1,uint16_t x2,uint16_t y2)
+{
+ uint16_t y,w;
+ uint8_t *p;
+
+ uint8_t and_mask,or_mask; // filling
+ uint8_t and_mask_side,or_mask_side; // left and right side
+
+ fb_sanitize_box(&x1,&y1,&x2,&y2);
+ fb_bw8_update_damage(x1,y1,x2,y2);
+
+ for(y=y1&0xfff8;y<=y2;y+=8){
+ /* don't clear any pixels (white) */
+ and_mask = and_mask_side = 0xff;
+ or_mask = or_mask_side = 0;
+
+ for(w=0;w<8;w++){ /* check which pixels are affected */
+ if(y+w >= y1 && y+w <= y2){
+ set_bg_pixel(&and_mask,&or_mask,w);
+ set_fg_pixel(&and_mask_side,&or_mask_side,w);
+ }
+
+ if(y+w == y1 || y+w == y2){ /* top and bottom line */
+ set_fg_pixel(&and_mask,&or_mask,w);
+ }
+ }
+
+ p = fb_bw8->mem + (y/8)*framebuffer->width + x1;
+ for(w=x1;w<=x2;w++){
+ if(w == x1 || w == x2)
+ *p = (*p & and_mask_side)|or_mask_side;
+ else
+ *p = (*p & and_mask)|or_mask;
+ p++;
+ }
+ }
+}
+
+/* draw box from cursor to (x,y) */
+void
+fb_bw8_boxto(uint16_t x,uint16_t y){
+ fb_bw8_box(framebuffer->cursor_x,framebuffer->cursor_y,x,y);
+ framebuffer->cursor_x = x;
+ framebuffer->cursor_y = y;
+}
+
+/* this is the most ridiculous function ever, because it has to
+ fiddle with two braindead bitmaps at once, both being
+ organized differently */
+
+/* draw text at current position, with current font and colours up
+ to a width of maxwidth pixels, return pixelwidth consumed */
+
+int
+fb_bw8_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 w; // 0..7 while building bits per byte
+ int y; // coordinates in display
+ int char_x,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
+ int fb8_offs; // offset to current pixel in framebuffer
+ uint8_t and_mask,or_mask; // to draw on framebuffer
+ uint8_t *p; // pointer into framebuffer memorya
+ 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;
+ 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
+
+#if 0
+ printf("%s: %d %d %d %d\n",__FUNCTION__,x1,y1,x2,y2);
+#endif
+
+ if(y1 < 0) // sanitize in case of overflow
+ y1 = 0;
+ if(y2 >= framebuffer->height)
+ y2 = framebuffer->height - 1;
+
+ fb8_offs = x1 + (y1 & 0xfff8)/8;
+
+ /* 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,'?');
+
+ byte_per_line = (fchr->bbox_w+7)/8;;
+
+ /* character pixels, left to right */
+ for(char_x=0;
+ char_x<fchr->width && char_x + framebuffer->cursor_x <= x2;
+ char_x++
+ ){
+ /* character pixels, top to bottom, in stripes
+ of 8 to match LCD RAM organisation */
+ for(y=y1&0xfff8;y<=y2;y+=8){ // display lines
+ /* 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;
+
+ fb8_offs = framebuffer->cursor_x +
+ char_x + (y/8)*framebuffer->width;
+
+ and_mask = 0xff;
+ or_mask = 0x00;
+
+ /* top to bottom inside of a 8bit column */
+ for(w=0;w<8;w++,bitmap_y++){
+ /* inside drawing area? */
+ if(y+w < y1 || y+w > y2)
+ continue;
+
+ /* 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)){
+ set_fg_pixel(&and_mask,
+ &or_mask,w);
+ } else { // unset, or outside bitmap
+outside_char_bitmap:
+ set_bg_pixel(&and_mask,
+ &or_mask,w);
+ }
+ } // for(w...)
+ /* adjust byte in framebuffer */
+ p = fb_bw8->mem + fb8_offs;
+ *p = ( *p & and_mask ) | or_mask;
+ } // for(y...)
+ } // for(char_x...)
+ framebuffer->cursor_x += char_x;
+ } // str
+
+ x2 = framebuffer->cursor_x;
+ fb_bw8_update_damage(x1,y1,x2,y2);
+ return x2-x1;
+}
+
+int
+fb_bw8_putchar(char c,int maxwidth){
+ char tmp[2];
+ tmp[0]=c;
+ tmp[1]=c;
+ return fb_bw8_putstr(tmp,maxwidth);
+}
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