Rocklua -- Extend / Fix rliImage

Some devices(1-bit / 2-bit displays) have packed bit formats that
 need to be unpacked in order to work on them at a pixel level.

This caused a few issues on 1 & 2-bit devices:
 Greatly Oversized data arrays for bitmaps
 Improper handling of native image data
 Framebuffer data was near unusable without jumping through hoops

Conversion between native addressing and per pixel addressing
 incurs extra overhead but it is much faster to do it
 on the 'C' side rather than in lua.

Not to mention the advantage of a unified interface for the end programer

-------------------------------------------------------------------
Adds a sane way to access each pixel of image data
Adds:
--------------------------------------------------------------------
img:clear([color],[x1],[y1],[x2],[y2])
 (set whole image or a portion to a particular value)
--------------------------------------------------------------------
img:invert([x1],[y1],[x2],[y2])
 (inverts whole image or a portion)
--------------------------------------------------------------------
img:marshal([x1],[y1],[x2],[y2],[funct])
 (calls funct for each point defined by rect of x1,y1 x2,y2
  returns value and allows setting value of each point return
  nil to terminate early)
--------------------------------------------------------------------
img:points([x1],[y1],[x2],[y2],[dx],[dy])
 (returns iterator function that steps delta-x and delta-y pixels each call
  returns value of pixel each call but doesn't allow setting to a new value
  compare to lua pairs method)
--------------------------------------------------------------------
img:copy(src,[x1],[y1],[x2],[y2],[w],[h],[clip][operation][clr/funct])
 (copies all or part of an image -- straight copy or special ops
  optionally calls funct for each point defined by rect of
  x1, y1, w, h and  x2, y2, w, h for dest and src images
  returns value of dst and src and allows setting value of
  each point return nil to terminate early)
--------------------------------------------------------------------
img:line(x1, y1, x2, y2, color)
--------------------------------------------------------------------
img:ellipse(x1, y1, x2, y2, color, [fillcolor]
--------------------------------------------------------------------
Fixed handling of 2-bit vertical integrated screens

Added direct element access for saving / restoring native image etc.

Added more data to tostring() handler and a way to access individual items

Added equals method to see if two variables reference the same image address
(doesn't check if two separate images contain the same 'picture')

Optimized get and set routines

Fixed out of bound x coord access shifting to next line

Added lua include files to expose new functionality

Finished image saving routine

Static allocation of set_viewport struct faster + saves ram over dynamic

Cleaned up code

Fixed pixel get/set for 1/2 bit devices

Fixed handling for 24-bit devices (32?)

-------------------------------------------------------------------------
Example lua script to follow on forums
-------------------------------------------------------------------------

Change-Id: I8a9ff0ff72aacf4b1662767ccb2b312fc355239c

1 files changed, 85 insertions, 0 deletions

diff --git a/apps/plugins/lua/include_lua/blit.lua b/apps/plugins/lua/include_lua/blit.lua
new file mode 100644
index 0000000000..6c5ea377e4
--- /dev/null
+++ b/apps/plugins/lua/include_lua/blit.lua
@@ -0,0 +1,85 @@
+--[[ Lua Blit Operations
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2017 William Wilgus
+ *
+ * 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 software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+]]
+
+--[[
+copy(dst, src, [dx, dy, sx, sy, offset_x, offset_y, clip, _blit.OP, clr/customfunct])
+ blit allows you to copy a [portion of a] source image to a dest image applying
+ a transformation operation to the pixels as they are copied
+ offsets are auto calculated if left empty or out of range
+ blit will default to copy if operation is empty or out of range
+
+it is slightly faster to use the number directly and you don't really
+    need to define all (any) of these if you don't use them but I put them
+    here for easier use of the blit function
+]]
+if not rb.lcd_framebuffer then rb.splash(rb.HZ, "No Support!") return nil end
+
+local _blit ={} do
+
+    _blit.CUSTOM = 0xFF  --user defined blit function func(dst_val, x, y, src_val, x, y)
+    _blit.BCOPY        = 0x0  --copy (use :copy() instead it is slightly faster
+    _blit.BOR          = 0x1  --OR source and dest pixels
+    _blit.BXOR         = 0x2  --XOR source and dest pixels
+    _blit.BNOR         = 0x3  --(NOT) (source OR dest pixels)
+    _blit.BSNOR        = 0x4  --(NOT source) OR dest pixels
+    _blit.BAND         = 0x5  --AND source and dest pixels
+    _blit.BNAND        = 0x6  --(NOT) AND source and dest pixels
+    _blit.BNOT         = 0x7  --NOT source and dest pixels
+    --blit functions for masks
+    _blit.BSAND        = 0x8 --copy color to dest if source pixel <> 0
+    _blit.BSNOT        = 0x9 --copy color to dest if source pixel == 0
+    --blit functions for masks with colors
+    _blit.BSORC        = 0xA --copy source pixel or color
+    _blit.BSXORC       = 0xB --copy source pixel xor color
+    _blit.BNSORC       = 0xC --copy ~(src_val | clr)
+    _blit.BSORNC       = 0xD --copy src_val | (~clr)
+    _blit.BSANDC       = 0xE --copy src_val & clr;
+    _blit.BNSANDC      = 0xF --copy (~src_val) & clr
+    _blit.BDORNSORC    = 0x10 --copy dst | (~src_val) | clr
+    _blit.BXORSADXORC  = 0x11 --copy dst ^ (src_val & (dst_val ^ clr))
+
+    _blit.BSNEC        = 0x12  --copy source pixel if source <> color
+    _blit.BSEQC        = 0x13 --copy source pixel if source == color
+    _blit.BSGTC        = 0x14 --copy source pixel if source > color
+    _blit.BSLTC        = 0x15 --copy source pixel if source < color
+    _blit.BDNEC        = 0x16 --copy source pixel if dest <> color
+    _blit.BDEQC        = 0x17 --copy source pixel if dest == color
+    _blit.BDGTC        = 0x18 --copy source pixel if dest > color
+    _blit.BDLTC        = 0x19 --copy source pixel if dest < color
+    _blit.BDNES        = 0x1A --copy color to dest if dest <> source pixel
+    _blit.BDEQS        = 0x1B --copy color to dest if dest == source pixel
+    _blit.BDGTS        = 0x1C --copy color to dest if dest > source pixel
+    _blit.BDLTS        = 0x1D --copy color to dest if dest < source pixel
+    --Source unused for these blits
+    _blit.BCOPYC       = 0x1E --copy color
+    _blit.BORC         = 0x1F --OR dest and color
+    _blit.BXORC        = 0x20 --XOR dest and color
+    _blit.BNDORC       = 0x21 --~(dst_val | clr)
+    _blit.BDORNC       = 0x22 --dst_val | (~clr)
+    _blit.BANDC        = 0x23 --AND dest and color
+    _blit.BNDANDC      = 0x24 --copy (~dst_val) & clr
+    _blit.BDLTS        = 0x25 --dest NOT color
+end -- _blit operations
+
+return _blit
+