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rockbox/apps/plugins/lib/grey.h
William Wilgus 3237ae4a4f LCD core move buf ptr and address look up function viewport struct 
I'm currently running up against the limitations of the lcd_draw functions
I want these functions to be able to be used on any size buffer not
just buffers with a stride matching the underlying device

[DONE] allow the framebuffer to be decoupled from the device framebuffer
[DONE need examples] allow for some simple blit like transformations
[DONE] remove the device framebuffer from the plugin api
[DONE}ditto remote framebuffer
[DONE] remove _viewport_get_framebuffer you can call struct *vp = lcd_set_viewport(NULL) and vp->buffer->fb_ptr

while remote lcds may compile (and work in the sim) its not been tested on targets

[FIXED] backdrops need work to be screen agnostic

[FIXED] screen statusbar is not being combined into the main viewport correctly yet

[FIXED] screen elements are displayed incorrectly  after switch to void*

[FIXED] core didn't restore proper viewport on splash etc.

[NEEDS TESTING] remote lcd garbled data

[FIXED] osd lib garbled screen on bmp_part

[FIXED] grey_set_vp needs to return old viewport like lcd_set_viewport

[FIXED] Viewport update now handles viewports with differing buffers/strides by copying to the main buffer

[FIXED] splash on top of WPS leaves old framebuffer data (doesn't redraw)
[UPDATE] refined this a bit more to have clear_viewport set the clean bit and have skin_render do its own screen clear
scrolling viewports no longer trigger wps refresh
also fixed a bug where guisyncyesno was displaying and then disappearing

[ADDED!] New LCD macros that allow you to create properly size frame buffers in you desired size without wasting bytes
(LCD_ and LCD_REMOTE_)
LCD_STRIDE(w, h) same as STRIDE_MAIN
LCD_FBSTRIDE(w, h) returns target specific stride for a buffer W x H
LCD_NBELEMS(w, h) returns the number of fb_data sized elemenst needed for a buffer W x H
LCD_NATIVE_STRIDE(s) conversion between rockbox native vertical and lcd native stride (2bitH)
test_viewports.c has an example of usage

[FIXED!!] 2bit targets don't respect non-native strides
[FIXED] Few define snags

Change-Id: I0d04c3834e464eca84a5a715743a297a0cefd0af
2020-10-26 12:28:48 -04:00

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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* New greyscale framework
*
* This is a generic framework to display 129 shades of grey on low-depth
* bitmap LCDs (Archos b&w, Iriver & Ipod 4-grey) within plugins.
*
* Copyright (C) 2008 Jens Arnold
*
* 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.
*
****************************************************************************/
#ifndef __GREY_H__
#define __GREY_H__
#include "plugin.h"
#if (LCD_DEPTH < 4)
/* The greyscale lib uses 8 bit brightness values natively on input. */
#define GREY_BRIGHTNESS(y) (y)
/* Some predefined levels for convenience: */
#define GREY_BLACK GREY_BRIGHTNESS(0)
#define GREY_DARKGRAY GREY_BRIGHTNESS(85)
#define GREY_LIGHTGRAY GREY_BRIGHTNESS(170)
#define GREY_WHITE GREY_BRIGHTNESS(255)
/* Greyscale library management structure declaration. You need one of these
* in every plugin using the library, depending on whether the structure should
* use IRAM or not. */
#define GREY_INFO_STRUCT struct _grey_info _grey_info SHAREDBSS_ATTR;
#define GREY_INFO_STRUCT_IRAM struct _grey_info _grey_info IBSS_ATTR;
/* Features you can request on library init (ORed together): */
#define GREY_BUFFERED 0x0001 /* Use a chunky buffer */
#define GREY_RAWMAPPED 0x0002 /* No gamma & LCD linearisation */
#define GREY_ON_COP 0x0004 /* Run ISR on COP (PP targets) */
/* Library initialisation and release */
bool grey_init(unsigned char *gbuf, long gbuf_size,
unsigned features, int width, int height, long *buf_taken);
void grey_release(void);
/* Special functions */
void grey_show(bool enable);
void grey_deferred_lcd_update(void);
/* Viewports and framebuffers */
void grey_clear_viewport(void);
struct viewport *grey_set_viewport(struct viewport *vp);
void grey_viewport_set_fullscreen(struct viewport *vp,
const enum screen_type screen);
void grey_viewport_set_pos(struct viewport *vp,
int x, int y, int width, int height);
void grey_set_framebuffer(unsigned char *buffer);
void grey_framebuffer_set_pos(int x, int y, int width, int height);
/* Update functions */
void grey_update(void);
void grey_update_rect(int x, int y, int width, int height);
/* Parameter handling */
void grey_set_position(int x, int y);
void grey_set_drawmode(int mode);
int grey_get_drawmode(void);
void grey_set_foreground(unsigned brightness);
unsigned grey_get_foreground(void);
void grey_set_background(unsigned brightness);
unsigned grey_get_background(void);
void grey_set_drawinfo(int mode, unsigned fg_brightness, unsigned bg_brightness);
void grey_setfont(int newfont);
int grey_getstringsize(const unsigned char *str, int *w, int *h);
/* Whole display */
void grey_clear_display(void);
void grey_ub_clear_display(void);
/* Pixel */
void grey_drawpixel(int x, int y);
/* Lines */
void grey_drawline(int x1, int y1, int x2, int y2);
void grey_hline(int x1, int x2, int y);
void grey_vline(int x, int y1, int y2);
void grey_drawrect(int x, int y, int nx, int ny);
/* Filled primitives */
void grey_fillrect(int x, int y, int nx, int ny);
void grey_filltriangle(int x1, int y1, int x2, int y2, int x3, int y3);
/* Bitmaps */
void grey_mono_bitmap_part(const unsigned char *src, int src_x, int src_y,
int stride, int x, int y, int width, int height);
void grey_mono_bitmap(const unsigned char *src, int x, int y, int width,
int height);
void grey_gray_bitmap_part(const unsigned char *src, int src_x, int src_y,
int stride, int x, int y, int width, int height);
void grey_gray_bitmap(const unsigned char *src, int x, int y, int width,
int height);
void grey_ub_gray_bitmap_part(const unsigned char *src, int src_x, int src_y,
int stride, int x, int y, int width, int height);
void grey_ub_gray_bitmap(const unsigned char *src, int x, int y, int width,
int height);
extern const struct custom_format format_grey;
/* Text */
void grey_putsxyofs(int x, int y, int ofs, const unsigned char *str);
void grey_putsxy(int x, int y, const unsigned char *str);
/* Scrolling */
void grey_scroll_left(int count);
void grey_scroll_right(int count);
void grey_scroll_up(int count);
void grey_scroll_down(int count);
void grey_ub_scroll_left(int count);
void grey_ub_scroll_right(int count);
void grey_ub_scroll_up(int count);
void grey_ub_scroll_down(int count);
/*** Internal stuff ***/
/* standard gamma (s23p8) */
#ifdef SIMULATOR /* Standard PC gamma */
#define _GREY_GAMMA ((200<<8)/100)
#else /* Target LCDs have a smaller contrast range */
#define _GREY_GAMMA ((180<<8)/100)
#endif
/* flag definitions */
#define _GREY_RUNNING 0x8000 /* greyscale overlay is running */
#define _GREY_DEFERRED_UPDATE 0x4000 /* lcd_update() requested */
#define _GREY_BACKLIGHT_ON 0x2000 /* backlight is active - only used on 1st+2nd Gen */
/* fast unsigned multiplication (16x16bit->32bit or 32x32bit->32bit,
* whichever is faster for the architecture) */
#ifdef CPU_ARM
#define _GREY_MULUQ(a, b) ((uint32_t) (((uint32_t) (a)) * ((uint32_t) (b))))
#else
#define _GREY_MULUQ(a, b) ((uint32_t) (((uint16_t) (a)) * ((uint16_t) (b))))
#endif
#if LCD_PIXELFORMAT == HORIZONTAL_PACKING
#define _GREY_BSHIFT 0
#else /* vertical packing or vertical interleaved */
#if (LCD_DEPTH == 1) || (LCD_PIXELFORMAT == VERTICAL_INTERLEAVED)
#define _GREY_BSHIFT 3
#elif LCD_DEPTH == 2
#define _GREY_BSHIFT 2
#endif
#endif /* LCD_PIXELFORMAT */
#define _GREY_BSIZE (1<<_GREY_BSHIFT)
#define _GREY_BMASK (_GREY_BSIZE-1)
/* The greyscale buffer management structure */
struct _grey_info
{
int x;
int y;
int width;
int height;
#if LCD_PIXELFORMAT == HORIZONTAL_PACKING
int bx; /* 8-pixel units */
int bwidth; /* 8-pixel units */
#else /* vertical packing or vertical interleaved */
int by; /* 4-pixel or 8-pixel units */
int bheight; /* 4-pixel or 8-pixel units */
#endif
unsigned long flags; /* various flags, see #defines */
unsigned char *values; /* start of greyscale pixel values */
unsigned char *phases; /* start of greyscale pixel phases */
unsigned char *buffer; /* start of chunky pixel buffer (for buffered mode) */
unsigned char *curbuffer; /* start of current framebuffer (for buffered mode) */
int cb_x; /* horizontal position of current framebuffer (for buffered mode) */
int cb_y; /* vertical position of current framebuffer (for buffered mode) */
int cb_width; /* width of current framebuffer (for buffered mode) */
int cb_height; /* height of current framebuffer (for buffered mode) */
int clip_l;
int clip_t;
int clip_r;
int clip_b;
unsigned char gvalue[256]; /* calculated brightness -> greyvalue table */
struct viewport *vp; /* current viewport in use */
};
/* Global variable, defined in the plugin */
extern struct _grey_info _grey_info;
#endif /* (LCD_DEPTH < 4) */
#endif /* __GREY_H__ */
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