Beginnings of a graphics library for the player LCD. So far the only drawing functions are clear_display(), drawpixel() and drawline().

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@5882 a1c6a512-1295-4272-9138-f99709370657

apps/plugins/lib/SOURCES

@@ -30,3 +30,6 @@ gray_set_foreground.c
 gray_setfont.c
 gray_verline.c
 #endif
+#ifdef HAVE_LCD_CHARCELLS
+playergfx.c
+#endif

apps/plugins/lib/playergfx.c

@@ -0,0 +1,160 @@
+/***************************************************************************
+*             __________               __   ___.
+*   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+*   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+*   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+*   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+*                     \/            \/     \/    \/            \/
+* $Id$
+*
+* Bitmap graphics on player LCD!
+*
+* Copyright (C) 2005 Jens Arnold
+*
+* All files in this archive are subject to the GNU General Public License.
+* See the file COPYING in the source tree root for full license agreement.
+*
+* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+* KIND, either express or implied.
+*
+****************************************************************************/
+
+#include "plugin.h"
+
+#ifdef HAVE_LCD_CHARCELLS /* Player only :) */
+#include "playergfx.h"
+
+/* Global variables */
+static struct plugin_api *pgfx_rb = NULL; /* global api struct pointer */
+static int char_width;
+static int char_height;
+static int pixel_height;
+static unsigned char gfx_chars[8];
+static unsigned char gfx_buffer[56];
+
+
+bool pgfx_init(struct plugin_api* newrb, int cwidth, int cheight)
+{
+    int i;
+
+    if (((unsigned) cwidth * (unsigned) cheight) > 8 || (unsigned) cheight > 2)
+        return false;
+
+    pgfx_rb = newrb;
+    char_width = cwidth;
+    char_height = cheight;
+    pixel_height = 7 * char_height;
+    
+    for (i = 0; i < cwidth * cheight; i++)
+    {
+        if ((gfx_chars[i] = pgfx_rb->lcd_get_locked_pattern()) == 0)
+        {
+            pgfx_release();
+            return false;
+        }
+    }
+
+    return true;
+}
+
+void pgfx_release(void)
+{
+    int i;
+    
+    for (i = 0; i < 8; i++)
+        if (gfx_chars[i])
+            pgfx_rb->lcd_unlock_pattern(gfx_chars[i]);
+}
+
+void pgfx_display(int cx, int cy)
+{
+    int i, j;
+    
+    for (i = 0; i < char_width * char_height; i++)
+        pgfx_rb->lcd_define_pattern(gfx_chars[i], gfx_buffer + 7 * i);
+        
+
+    for (i = 0; i < char_width; i++)
+        for (j = 0; j < char_height; j++)
+            pgfx_rb->lcd_putc(cx + i, cy + j, gfx_chars[char_height * i + j]);
+}
+
+void pgfx_clear_display(void)
+{
+    pgfx_rb->memset(gfx_buffer, 0, char_width * pixel_height);
+}
+
+void pgfx_drawpixel(int x, int y)
+{
+    gfx_buffer[pixel_height * (x/5) + y] |= 0x10 >> (x%5);
+}
+
+void pgfx_drawline(int x1, int y1, int x2, int y2)
+{
+    int numpixels;
+    int i;
+    int deltax, deltay;
+    int d, dinc1, dinc2;
+    int x, xinc1, xinc2;
+    int y, yinc1, yinc2;
+
+    deltax = abs(x2 - x1);
+    deltay = abs(y2 - y1);
+    xinc2 = 1;
+    yinc2 = 1;
+
+    if (deltax >= deltay)
+    {
+        numpixels = deltax;
+        d = 2 * deltay - deltax;
+        dinc1 = deltay * 2;
+        dinc2 = (deltay - deltax) * 2;
+        xinc1 = 1;
+        yinc1 = 0;
+    }
+    else
+    {
+        numpixels = deltay;
+        d = 2 * deltax - deltay;
+        dinc1 = deltax * 2;
+        dinc2 = (deltax - deltay) * 2;
+        xinc1 = 0;
+        yinc1 = 1;
+    }
+    numpixels++; /* include endpoints */
+
+    if(x1 > x2)
+    {
+        xinc1 = -xinc1;
+        xinc2 = -xinc2;
+    }
+
+    if(y1 > y2)
+    {
+        yinc1 = -yinc1;
+        yinc2 = -yinc2;
+    }
+
+    x = x1;
+    y = y1;
+
+    for (i = 0; i < numpixels; i++)
+    {
+        pgfx_drawpixel(x, y);
+
+        if (d < 0)
+        {
+            d += dinc1;
+            x += xinc1;
+            y += yinc1;
+        }
+        else
+        {
+            d += dinc2;
+            x += xinc2;
+            y += yinc2;
+        }
+    }
+}
+
+#endif /* HAVE_LCD_CHARCELLS */

apps/plugins/lib/playergfx.h

@@ -0,0 +1,37 @@
+/***************************************************************************
+*             __________               __   ___.
+*   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+*   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+*   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+*   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+*                     \/            \/     \/    \/            \/
+* $Id$
+*
+* Bitmap graphics on player LCD!
+*
+* Copyright (C) 2005 Jens Arnold
+*
+* All files in this archive are subject to the GNU General Public License.
+* See the file COPYING in the source tree root for full license agreement.
+*
+* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+* KIND, either express or implied.
+*
+****************************************************************************/
+
+#ifndef __PGFX_H__
+#define __PGFX_H__
+
+#include "plugin.h"
+
+#ifdef HAVE_LCD_CHARCELLS /* Player only :) */
+
+bool pgfx_init(struct plugin_api* newrb, int cwidth, int cheight);
+void pgfx_release(void);
+void pgfx_display(int cx, int cy);
+void pgfx_clear_display(void);
+void pgfx_drawpixel(int x, int y);
+void pgfx_drawline(int x1, int y1, int x2, int y2);
+
+#endif /* HAVE_LCD_CHARCELLS */
+#endif /* __PGFX_H__ */