From a9244032d2786997bf72a4b5f3f260579446df04 Mon Sep 17 00:00:00 2001
From: Daniel Stenberg <daniel@haxx.se>
Date: Wed, 19 May 2004 08:03:43 +0000
Subject: grayscale framework header

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@4638 a1c6a512-1295-4272-9138-f99709370657
---
 apps/plugins/lib/grayscale.h | 93 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 93 insertions(+)
 create mode 100644 apps/plugins/lib/grayscale.h

(limited to 'apps/plugins')

diff --git a/apps/plugins/lib/grayscale.h b/apps/plugins/lib/grayscale.h
new file mode 100644
index 0000000000..7c4b5715ed
--- /dev/null
+++ b/apps/plugins/lib/grayscale.h
@@ -0,0 +1,93 @@
+/***************************************************************************
+*             __________               __   ___.
+*   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+*   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+*   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+*   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+*                     \/            \/     \/    \/            \/
+* $Id$
+*
+* Grayscale framework & demo plugin
+*
+* Copyright (C) 2004 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.
+*
+****************************************************************************/
+
+/* You do not want to touch these if you don't know exactly what you're
+ * doing. */
+
+#define GRAY_RUNNING          0x0001  /* grayscale overlay is running */
+#define GRAY_DEFERRED_UPDATE  0x0002  /* lcd_update() requested */
+
+/* unsigned 16 bit multiplication (a single instruction on the SH) */
+#define MULU16(a, b) (((unsigned short) (a)) * ((unsigned short) (b)))
+
+typedef struct
+{
+    int x;
+    int by;        /* 8-pixel units */
+    int width;
+    int height;
+    int bheight;   /* 8-pixel units */
+    int plane_size;
+    int depth;     /* number_of_bitplanes  = (number_of_grayscales - 1) */
+    int cur_plane; /* for the timer isr */
+    unsigned long randmask; /* mask for random value in graypixel() */
+    unsigned long flags;    /* various flags, see #defines */
+    unsigned char *data;    /* pointer to start of bitplane data */
+    unsigned long *bitpattern; /* pointer to start of pattern table */
+} tGraybuf;
+
+static tGraybuf *graybuf = NULL;
+static short gray_random_buffer;
+
+/** prototypes **/
+
+void gray_timer_isr(void);
+void graypixel(int x, int y, unsigned long pattern);
+void grayblock(int x, int by, unsigned char* src, int stride);
+void grayinvertmasked(int x, int by, unsigned char mask);
+int gray_init_buffer(unsigned char *gbuf, int gbuf_size, int width,
+                     int bheight, int depth);
+void gray_release_buffer(void);
+void gray_position_display(int x, int by);
+void gray_show_display(bool enable);
+
+/* functions affecting the whole display */
+void gray_clear_display(void);
+void gray_black_display(void);
+void gray_deferred_update(void);
+
+/* scrolling functions */
+void gray_scroll_left(int count, bool black_border);
+void gray_scroll_right(int count, bool black_border);
+void gray_scroll_up8(bool black_border);
+void gray_scroll_down8(bool black_border);
+void gray_scroll_up(int count, bool black_border);
+void gray_scroll_down(int count, bool black_border);
+
+/* pixel functions */
+void gray_drawpixel(int x, int y, int brightness);
+void gray_invertpixel(int x, int y);
+
+/* line functions */
+void gray_drawline(int x1, int y1, int x2, int y2, int brightness);
+void gray_invertline(int x1, int y1, int x2, int y2);
+
+/* rectangle functions */
+void gray_drawrect(int x1, int y1, int x2, int y2, int brightness);
+void gray_fillrect(int x1, int y1, int x2, int y2, int brightness);
+void gray_invertrect(int x1, int y1, int x2, int y2);
+
+/* bitmap functions */
+void gray_drawgraymap(unsigned char *src, int x, int y, int nx, int ny,
+                      int stride);
+void gray_drawbitmap(unsigned char *src, int x, int y, int nx, int ny,
+                     int stride, bool draw_bg, int fg_brightness,
+                     int bg_brightness);
-- 
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