Add viewport capabilities to all the LCD drivers, and adapt scrolling code. This is the firmware/ part of FS#8385 - the changes to the WPS code still need more work and will be committed at a later date. NOTE: There are no user-visible changes with this commit - just the infrastructure.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@16018 a1c6a512-1295-4272-9138-f99709370657

1 files changed, 171 insertions, 79 deletions

diff --git a/firmware/drivers/lcd-1bit-vert.c b/firmware/drivers/lcd-1bit-vert.c
index bd62e105cb..5c651a9613 100644
--- a/firmware/drivers/lcd-1bit-vert.c
+++ b/firmware/drivers/lcd-1bit-vert.c
@@ -35,10 +35,40 @@
 
 unsigned char lcd_framebuffer[LCD_FBHEIGHT][LCD_FBWIDTH];
 
-static int drawmode = DRMODE_SOLID;
-static int xmargin = 0;
-static int ymargin = 0;
-static int curfont = FONT_SYSFIXED;
+static struct viewport default_vp =
+{
+    .x        = 0,
+    .y        = 0,
+    .width    = LCD_WIDTH,
+    .height   = LCD_HEIGHT,
+    .font     = FONT_SYSFIXED,
+    .drawmode = DRMODE_SOLID,
+    .xmargin  = 0,
+    .ymargin  = 0,
+};
+
+static struct viewport* current_vp = &default_vp;
+
+/*** Viewports ***/
+
+void lcd_set_viewport(struct viewport* vp)
+{
+    if (vp == NULL)
+        current_vp = &default_vp;
+    else
+        current_vp = vp;
+}
+
+void lcd_update_viewport(void)
+{
+    lcd_update_rect(current_vp->x, current_vp->y,
+                    current_vp->width, current_vp->height);
+}
+
+void lcd_update_viewport_rect(int x, int y, int width, int height)
+{
+    lcd_update_rect(current_vp->x + x, current_vp->y + y, width, height);
+}
 
 /* LCD init */
 void lcd_init(void)
@@ -53,38 +83,48 @@ void lcd_init(void)
 
 void lcd_set_drawmode(int mode)
 {
-    drawmode = mode & (DRMODE_SOLID|DRMODE_INVERSEVID);
+    current_vp->drawmode = mode & (DRMODE_SOLID|DRMODE_INVERSEVID);
 }
 
 int lcd_get_drawmode(void)
 {
-    return drawmode;
+    return current_vp->drawmode;
 }
 
 void lcd_setmargins(int x, int y)
 {
-    xmargin = x;
-    ymargin = y;
+    current_vp->xmargin = x;
+    current_vp->ymargin = y;
 }
 
 int lcd_getxmargin(void)
 {
-    return xmargin;
+    return current_vp->xmargin;
 }
 
 int lcd_getymargin(void)
 {
-    return ymargin;
+    return current_vp->ymargin;
+}
+
+int lcd_getwidth(void)
+{
+    return current_vp->width;
+}
+
+int lcd_getheight(void)
+{
+    return current_vp->height;
 }
 
 void lcd_setfont(int newfont)
 {
-    curfont = newfont;
+    current_vp->font = newfont;
 }
 
 int lcd_getstringsize(const unsigned char *str, int *w, int *h)
 {
-    return font_getstringsize(str, w, h, curfont);
+    return font_getstringsize(str, w, h, current_vp->font);
 }
 
 /*** low-level drawing functions ***/
@@ -187,17 +227,42 @@ lcd_blockfunc_type* const lcd_blockfuncs[8] = {
 /* Clear the whole display */
 void lcd_clear_display(void)
 {
-    unsigned bits = (drawmode & DRMODE_INVERSEVID) ? 0xFFu : 0;
+    unsigned bits = (current_vp->drawmode & DRMODE_INVERSEVID) ? 0xFFu : 0;
 
     memset(lcd_framebuffer, bits, sizeof lcd_framebuffer);
     lcd_scroll_info.lines = 0;
 }
 
+void lcd_clear_viewport(void)
+{
+    int oldmode;
+
+    if (current_vp == &default_vp)
+    {
+        lcd_clear_display();
+    }
+    else
+    {
+        oldmode = current_vp->drawmode;
+
+        /* Invert the INVERSEVID bit and set basic mode to SOLID */
+        current_vp->drawmode = (~current_vp->drawmode & DRMODE_INVERSEVID) | 
+                               DRMODE_SOLID;
+
+        lcd_fillrect(0, 0, current_vp->width, current_vp->height);
+
+        current_vp->drawmode = oldmode;
+
+        lcd_scroll_stop(current_vp);
+    }
+}
+
 /* Set a single pixel */
 void lcd_drawpixel(int x, int y)
 {
-    if (((unsigned)x < LCD_WIDTH) && ((unsigned)y < LCD_HEIGHT))
-        lcd_pixelfuncs[drawmode](x, y);
+    if (((unsigned)x < (unsigned)current_vp->width) &&
+        ((unsigned)y < (unsigned)current_vp->height))
+        lcd_pixelfuncs[current_vp->drawmode](current_vp->x + x, current_vp->y + y);
 }
 
 /* Draw a line */
@@ -209,7 +274,7 @@ void lcd_drawline(int x1, int y1, int x2, int y2)
     int d, dinc1, dinc2;
     int x, xinc1, xinc2;
     int y, yinc1, yinc2;
-    lcd_pixelfunc_type *pfunc = lcd_pixelfuncs[drawmode];
+    lcd_pixelfunc_type *pfunc = lcd_pixelfuncs[current_vp->drawmode];
 
     deltax = abs(x2 - x1);
     deltay = abs(y2 - y1);
@@ -253,8 +318,9 @@ void lcd_drawline(int x1, int y1, int x2, int y2)
 
     for (i = 0; i < numpixels; i++)
     {
-        if (((unsigned)x < LCD_WIDTH) && ((unsigned)y < LCD_HEIGHT))
-            pfunc(x, y);
+        if (((unsigned)x < (unsigned)current_vp->width) &&
+            ((unsigned)y < (unsigned)current_vp->height))
+            pfunc(current_vp->x + x, current_vp->y + y);
 
         if (d < 0)
         {
@@ -288,16 +354,22 @@ void lcd_hline(int x1, int x2, int y)
     }
     
     /* nothing to draw? */
-    if (((unsigned)y >= LCD_HEIGHT) || (x1 >= LCD_WIDTH) || (x2 < 0))
+    if (((unsigned)y >= (unsigned)current_vp->height) || (x1 >= current_vp->width)
+        || (x2 < 0))
         return;  
     
     /* clipping */
     if (x1 < 0)
         x1 = 0;
-    if (x2 >= LCD_WIDTH)
-        x2 = LCD_WIDTH-1;
+    if (x2 >= current_vp->width)
+        x2 = current_vp->width-1;
         
-    bfunc = lcd_blockfuncs[drawmode];
+    /* adjust for viewport */
+    y += current_vp->y;
+    x1 += current_vp->x;
+    x2 += current_vp->x;
+
+    bfunc = lcd_blockfuncs[current_vp->drawmode];
     dst   = &lcd_framebuffer[y>>3][x1];
     mask  = 1 << (y & 7);
 
@@ -324,16 +396,22 @@ void lcd_vline(int x, int y1, int y2)
     }
 
     /* nothing to draw? */
-    if (((unsigned)x >= LCD_WIDTH) || (y1 >= LCD_HEIGHT) || (y2 < 0))
+    if (((unsigned)x >= (unsigned)current_vp->width) || (y1 >= current_vp->height)
+        || (y2 < 0))
         return;  
     
     /* clipping */
     if (y1 < 0)
         y1 = 0;
-    if (y2 >= LCD_HEIGHT)
-        y2 = LCD_HEIGHT-1;
+    if (y2 >= current_vp->height)
+        y2 = current_vp->height-1;
         
-    bfunc = lcd_blockfuncs[drawmode];
+    /* adjust for viewport */
+    y1 += current_vp->y;
+    y2 += current_vp->y;
+    x += current_vp->x;
+
+    bfunc = lcd_blockfuncs[current_vp->drawmode];
     dst   = &lcd_framebuffer[y1>>3][x];
     ny    = y2 - (y1 & ~7);
     mask  = 0xFFu << (y1 & 7);
@@ -375,8 +453,8 @@ void lcd_fillrect(int x, int y, int width, int height)
     bool fillopt = false;
 
     /* nothing to draw? */
-    if ((width <= 0) || (height <= 0) || (x >= LCD_WIDTH) || (y >= LCD_HEIGHT)
-        || (x + width <= 0) || (y + height <= 0))
+    if ((width <= 0) || (height <= 0) || (x >= current_vp->width)
+        || (y >= current_vp->height) || (x + width <= 0) || (y + height <= 0))
         return;
 
     /* clipping */
@@ -390,27 +468,31 @@ void lcd_fillrect(int x, int y, int width, int height)
         height += y;
         y = 0;
     }
-    if (x + width > LCD_WIDTH)
-        width = LCD_WIDTH - x;
-    if (y + height > LCD_HEIGHT)
-        height = LCD_HEIGHT - y;
+    if (x + width > current_vp->width)
+        width = current_vp->width - x;
+    if (y + height > current_vp->height)
+        height = current_vp->height - y;
         
-    if (drawmode & DRMODE_INVERSEVID)
+    /* adjust for viewport */
+    x += current_vp->x;
+    y += current_vp->y;
+
+    if (current_vp->drawmode & DRMODE_INVERSEVID)
     {
-        if (drawmode & DRMODE_BG)
+        if (current_vp->drawmode & DRMODE_BG)
         {
             fillopt = true;
         }
     }
     else
     {
-        if (drawmode & DRMODE_FG)
+        if (current_vp->drawmode & DRMODE_FG)
         {
             fillopt = true;
             bits = 0xFFu;
         }
     }
-    bfunc = lcd_blockfuncs[drawmode];
+    bfunc = lcd_blockfuncs[current_vp->drawmode];
     dst   = &lcd_framebuffer[y>>3][x];
     ny    = height - 1 + (y & 7);
     mask  = 0xFFu << (y & 7);
@@ -470,8 +552,8 @@ void lcd_bitmap_part(const unsigned char *src, int src_x, int src_y,
     lcd_blockfunc_type *bfunc;
 
     /* nothing to draw? */
-    if ((width <= 0) || (height <= 0) || (x >= LCD_WIDTH) || (y >= LCD_HEIGHT)
-        || (x + width <= 0) || (y + height <= 0))
+    if ((width <= 0) || (height <= 0) || (x >= current_vp->width)
+        || (y >= current_vp->height) || (x + width <= 0) || (y + height <= 0))
         return;
         
     /* clipping */
@@ -487,10 +569,14 @@ void lcd_bitmap_part(const unsigned char *src, int src_x, int src_y,
         src_y -= y;
         y = 0;
     }
-    if (x + width > LCD_WIDTH)
-        width = LCD_WIDTH - x;
-    if (y + height > LCD_HEIGHT)
-        height = LCD_HEIGHT - y;
+    if (x + width > current_vp->width)
+        width = current_vp->width - x;
+    if (y + height > current_vp->height)
+        height = current_vp->height - y;
+
+    /* adjust for viewport */
+    x += current_vp->x;
+    y += current_vp->y;
 
     src    += stride * (src_y >> 3) + src_x; /* move starting point */
     src_y  &= 7;
@@ -499,13 +585,13 @@ void lcd_bitmap_part(const unsigned char *src, int src_x, int src_y,
     shift  = y & 7;
     ny     = height - 1 + shift + src_y;
 
-    bfunc  = lcd_blockfuncs[drawmode];
+    bfunc  = lcd_blockfuncs[current_vp->drawmode];
     mask   = 0xFFu << (shift + src_y);
     mask_bottom = 0xFFu >> (~ny & 7);
     
     if (shift == 0)
     {
-        bool copyopt = (drawmode == DRMODE_SOLID);
+        bool copyopt = (current_vp->drawmode == DRMODE_SOLID);
 
         for (; ny >= 8; ny -= 8)
         {
@@ -582,11 +668,11 @@ static void lcd_putsxyofs(int x, int y, int ofs, const unsigned char *str)
 {
     unsigned short ch;
     unsigned short *ucs;
-    struct font* pf = font_get(curfont);
+    struct font* pf = font_get(current_vp->font);
 
     ucs = bidi_l2v(str, 1);
 
-    while ((ch = *ucs++) != 0 && x < LCD_WIDTH)
+    while ((ch = *ucs++) != 0 && x < current_vp->width)
     {
         int width;
         const unsigned char *bits;
@@ -639,24 +725,24 @@ void lcd_puts_style_offset(int x, int y, const unsigned char *str,
                            int style, int offset)
 {
     int xpos,ypos,w,h,xrect;
-    int lastmode = drawmode;
+    int lastmode = current_vp->drawmode;
 
     /* make sure scrolling is turned off on the line we are updating */
-    lcd_scroll_info.lines &= ~(1 << y);
+    lcd_scroll_stop_line(current_vp, y);
 
     if(!str || !str[0])
         return;
 
     lcd_getstringsize(str, &w, &h);
-    xpos = xmargin + x*w / utf8length(str);
-    ypos = ymargin + y*h;
-    drawmode = (style & STYLE_INVERT) ?
-               (DRMODE_SOLID|DRMODE_INVERSEVID) : DRMODE_SOLID;
+    xpos = current_vp->xmargin + x*w / utf8length(str);
+    ypos = current_vp->ymargin + y*h;
+    current_vp->drawmode = (style & STYLE_INVERT) ?
+                           (DRMODE_SOLID|DRMODE_INVERSEVID) : DRMODE_SOLID;
     lcd_putsxyofs(xpos, ypos, offset, str);
-    drawmode ^= DRMODE_INVERSEVID;
+    current_vp->drawmode ^= DRMODE_INVERSEVID;
     xrect = xpos + MAX(w - offset, 0);
-    lcd_fillrect(xrect, ypos, LCD_WIDTH - xrect, h);
-    drawmode = lastmode;
+    lcd_fillrect(xrect, ypos, current_vp->width - xrect, h);
+    current_vp->drawmode = lastmode;
 }
 
 /*** scrolling ***/
@@ -682,9 +768,15 @@ void lcd_puts_scroll_style_offset(int x, int y, const unsigned char *string,
     struct scrollinfo* s;
     int w, h;
 
-    if(y>=LCD_SCROLLABLE_LINES) return;
+    if ((unsigned)y >= (unsigned)current_vp->height)
+        return;
+
+    /* remove any previously scrolling line at the same location */
+    lcd_scroll_stop_line(current_vp, y);
+
+    if (lcd_scroll_info.lines >= LCD_SCROLLABLE_LINES) return;
 
-    s = &lcd_scroll_info.scroll[y];
+    s = &lcd_scroll_info.scroll[lcd_scroll_info.lines];
 
     s->start_tick = current_tick + lcd_scroll_info.delay;
     s->style = style;
@@ -696,7 +788,7 @@ void lcd_puts_scroll_style_offset(int x, int y, const unsigned char *string,
 
     lcd_getstringsize(string, &w, &h);
 
-    if (LCD_WIDTH - x * 8 - xmargin < w) {
+    if (current_vp->width - x * 8 - current_vp->xmargin < w) {
         /* prepare scroll line */
         char *end;
 
@@ -709,7 +801,7 @@ void lcd_puts_scroll_style_offset(int x, int y, const unsigned char *string,
         /* scroll bidirectional or forward only depending on the string
            width */
         if ( lcd_scroll_info.bidir_limit ) {
-            s->bidir = s->width < (LCD_WIDTH - xmargin) *
+            s->bidir = s->width < (current_vp->width - current_vp->xmargin) *
                 (100 + lcd_scroll_info.bidir_limit) / 100;
         }
         else
@@ -722,17 +814,16 @@ void lcd_puts_scroll_style_offset(int x, int y, const unsigned char *string,
         }
 
         end = strchr(s->line, '\0');
-        strncpy(end, string, LCD_WIDTH/2);
+        strncpy(end, string, current_vp->width/2);
 
+        s->vp = current_vp;
+        s->y = y;
         s->len = utf8length(string);
         s->offset = offset;
-        s->startx = xmargin + x * s->width / s->len;;
+        s->startx = current_vp->xmargin + x * s->width / s->len;;
         s->backward = false;
-        lcd_scroll_info.lines |= (1<<y);
+        lcd_scroll_info.lines++;
     }
-    else
-        /* force a bit switch-off since it doesn't scroll */
-        lcd_scroll_info.lines &= ~(1<<y);
 }
 
 void lcd_scroll_fn(void)
@@ -742,26 +833,25 @@ void lcd_scroll_fn(void)
     int index;
     int xpos, ypos;
     int lastmode;
+    struct viewport* old_vp = current_vp;
 
-    for ( index = 0; index < LCD_SCROLLABLE_LINES; index++ ) {
-        /* really scroll? */
-        if ((lcd_scroll_info.lines & (1 << index)) == 0)
-            continue;
-
+    for ( index = 0; index < lcd_scroll_info.lines; index++ ) {
         s = &lcd_scroll_info.scroll[index];
 
         /* check pause */
         if (TIME_BEFORE(current_tick, s->start_tick))
             continue;
 
+        lcd_set_viewport(s->vp);
+
         if (s->backward)
             s->offset -= lcd_scroll_info.step;
         else
             s->offset += lcd_scroll_info.step;
 
-        pf = font_get(curfont);
+        pf = font_get(current_vp->font);
         xpos = s->startx;
-        ypos = ymargin + index * pf->height;
+        ypos = current_vp->ymargin + s->y * pf->height;
 
         if (s->bidir) { /* scroll bidirectional */
             if (s->offset <= 0) {
@@ -770,9 +860,9 @@ void lcd_scroll_fn(void)
                 s->backward = false;
                 s->start_tick = current_tick + lcd_scroll_info.delay * 2;
             }
-            if (s->offset >= s->width - (LCD_WIDTH - xpos)) {
+            if (s->offset >= s->width - (current_vp->width - xpos)) {
                 /* at end of line */
-                s->offset = s->width - (LCD_WIDTH - xpos);
+                s->offset = s->width - (current_vp->width - xpos);
                 s->backward = true;
                 s->start_tick = current_tick + lcd_scroll_info.delay * 2;
             }
@@ -783,11 +873,13 @@ void lcd_scroll_fn(void)
                 s->offset %= s->width;
         }
 
-        lastmode = drawmode;
-        drawmode = (s->style&STYLE_INVERT) ?
-            (DRMODE_SOLID|DRMODE_INVERSEVID) : DRMODE_SOLID;
+        lastmode = current_vp->drawmode;
+        current_vp->drawmode = (s->style&STYLE_INVERT) ?
+                               (DRMODE_SOLID|DRMODE_INVERSEVID) : DRMODE_SOLID;
         lcd_putsxyofs(xpos, ypos, s->offset, s->line);
-        drawmode = lastmode;
-        lcd_update_rect(xpos, ypos, LCD_WIDTH - xpos, pf->height);
+        current_vp->drawmode = lastmode;
+        lcd_update_viewport_rect(xpos, ypos, current_vp->width - xpos, pf->height);
     }
+
+    lcd_set_viewport(old_vp);
 }