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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (c) 2007, 2011 Michael Sevakis
*
* Shared C code for memory framebuffer LCDs
*
* 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.
*
****************************************************************************/
#include "config.h"
#include "system.h"
#include "lcd.h"
#include "lcd-target.h"
/*** Misc. functions ***/
bool lcd_on SHAREDBSS_ATTR = false;
#if defined(HAVE_LCD_ENABLE) || defined(HAVE_LCD_SLEEP)
bool lcd_active(void)
{
return lcd_on;
}
/* For use by target driver only! */
void lcd_set_active(bool active)
{
lcd_on = active;
}
#else
#define lcd_on true
#endif
#ifndef lcd_write_enabled
#define lcd_write_enabled() lcd_on
#endif
/*** Blitting functions ***/
/* Copies a rectangle from one framebuffer to another. Can be used in
single transfer mode with width = num pixels, and height = 1 which
allows a full-width rectangle to be copied more efficiently. */
extern void lcd_copy_buffer_rect(fb_data *dst, const fb_data *src,
int width, int height);
#ifndef LCD_OPTIMIZED_UPDATE
/* Update the display.
This must be called after all other LCD functions that change the display. */
void lcd_update(void)
{
if (!lcd_write_enabled())
return;
/* Copy the Rockbox framebuffer to the second framebuffer */
lcd_copy_buffer_rect(LCD_FRAMEBUF_ADDR(0, 0), FBADDR(0,0),
LCD_WIDTH*LCD_HEIGHT, 1);
}
#endif /* LCD_OPTIMIZED_UPDATE */
#ifndef LCD_OPTIMIZED_UPDATE_RECT
/* Update a fraction of the display. */
void lcd_update_rect(int x, int y, int width, int height)
{
fb_data *dst, *src;
if (!lcd_write_enabled())
return;
if (x + width > LCD_WIDTH)
width = LCD_WIDTH - x; /* Clip right */
if (x < 0)
width += x, x = 0; /* Clip left */
if (width <= 0)
return; /* nothing left to do */
if (y + height > LCD_HEIGHT)
height = LCD_HEIGHT - y; /* Clip bottom */
if (y < 0)
height += y, y = 0; /* Clip top */
if (height <= 0)
return; /* nothing left to do */
dst = LCD_FRAMEBUF_ADDR(x, y);
src = FBADDR(x,y);
/* Copy part of the Rockbox framebuffer to the second framebuffer */
if (width < LCD_WIDTH)
{
/* Not full width - do line-by-line */
lcd_copy_buffer_rect(dst, src, width, height);
}
else
{
/* Full width - copy as one line */
lcd_copy_buffer_rect(dst, src, LCD_WIDTH*height, 1);
}
}
#endif /* LCD_OPTIMIZED_UPDATE_RECT */
/*** YUV functions ***/
static unsigned lcd_yuv_options SHAREDBSS_ATTR = 0;
/* Line write helper function for lcd_yuv_blit. Write two lines of yuv420. */
extern void lcd_write_yuv420_lines(fb_data *dst,
unsigned char const * const src[3],
int width,
int stride);
extern void lcd_write_yuv420_lines_odither(fb_data *dst,
unsigned char const * const src[3],
int width,
int stride,
int x_screen, /* To align dither pattern */
int y_screen);
void lcd_yuv_set_options(unsigned options)
{
lcd_yuv_options = options;
}
#ifndef LCD_OPTIMIZED_BLIT_YUV
/* Performance function to blit a YUV bitmap directly to the LCD
* src_x, src_y, width and height should be even and within the LCD's
* boundaries.
*
* For portrait LCDs, show it rotated counterclockwise by 90 degrees
*/
void lcd_blit_yuv(unsigned char * const src[3],
int src_x, int src_y, int stride,
int x, int y, int width, int height)
{
/* Macrofy the bits that change between orientations */
#if CONFIG_ORIENTATION == SCREEN_PORTRAIT
#define LCD_FRAMEBUF_ADDR_ORIENTED(col, row) \
LCD_FRAMEBUF_ADDR(row, col)
#define lcd_write_yuv420_lines_odither_oriented(dst, src, w, s, col, row) \
lcd_write_yuv420_lines_odither(dst, src, w, s, row, col)
#define YUV_NEXTLINE() dst -= 2
#define YUV_DITHER_NEXTLINE() dst -= 2, y -= 2
#else
#define LCD_FRAMEBUF_ADDR_ORIENTED(col, row) \
LCD_FRAMEBUF_ADDR(col, row)
#define lcd_write_yuv420_lines_odither_oriented(dst, src, w, s, col, row) \
lcd_write_yuv420_lines_odither(dst, src, w, s, col, row)
#define YUV_NEXTLINE() dst += 2*LCD_FBWIDTH
#define YUV_DITHER_NEXTLINE() dst += 2*LCD_FBWIDTH, y += 2
#endif
if (!lcd_write_enabled())
return;
/* Sorry, but width and height must be >= 2 or else */
width &= ~1;
height >>= 1;
#if CONFIG_ORIENTATION == SCREEN_PORTRAIT
/* Adjust portrait coordinates to make (0, 0) the upper right corner */
y = LCD_WIDTH - 1 - y;
#endif
fb_data *dst = LCD_FRAMEBUF_ADDR_ORIENTED(x, y);
int z = stride*src_y;
unsigned char const * yuv_src[3];
yuv_src[0] = src[0] + z + src_x;
yuv_src[1] = src[1] + (z >> 2) + (src_x >> 1);
yuv_src[2] = src[2] + (yuv_src[1] - src[1]);
if (lcd_yuv_options & LCD_YUV_DITHER)
{
do
{
lcd_write_yuv420_lines_odither_oriented(dst, yuv_src, width,
stride, x, y);
yuv_src[0] += stride << 1; /* Skip down two luma lines */
yuv_src[1] += stride >> 1; /* Skip down one chroma line */
yuv_src[2] += stride >> 1;
YUV_DITHER_NEXTLINE();
}
while (--height > 0);
}
else
{
do
{
lcd_write_yuv420_lines(dst, yuv_src, width, stride);
yuv_src[0] += stride << 1; /* Skip down two luma lines */
yuv_src[1] += stride >> 1; /* Skip down one chroma line */
yuv_src[2] += stride >> 1;
YUV_NEXTLINE();
}
while (--height > 0);
}
}
#endif /* LCD_OPTIMIZED_BLIT_YUV */
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