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/**
* \file
*
* \brief Local framebuffer
*
* Copyright (c) 2011-2015 Atmel Corporation. All rights reserved.
*
* \asf_license_start
*
* \page License
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* 3. The name of Atmel may not be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* 4. This software may only be redistributed and used in connection with an
* Atmel microcontroller product.
*
* THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
* EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* \asf_license_stop
*
*/
/*
* Support and FAQ: visit <a href="http://www.atmel.com/design-support/">Atmel Support</a>
*/
#include "gfx_mono_framebuffer.h"
/* Pointer to the framebuffer; updated by the gfx_mono_set_framebuffer function */
static uint8_t *fbpointer;
/**
* \brief Set the LCD framebuffer.
*
* \param[in] framebuffer A pointer to an allocated area of RAM that can hold the
* framebuffer.
*
* A small example:
* \code
uint8_t framebuffer[FRAMEBUFFER_SIZE];
gfx_mono_set_framebuffer(framebuffer);
\endcode
*/
void gfx_mono_set_framebuffer(uint8_t *framebuffer)
{
fbpointer = framebuffer;
}
/**
* \brief Put a page from RAM to the framebuffer
*
* \param[in] data Pointer to data to be written
* \param[in] page Page address
* \param[in] column Offset into page (x coordinate)
* \param[in] width Number of bytes to be written.
*
* The following example will write 32 bytes from data_buf to the page 0,
* column 10 (byte 10 to 42 in the framebuffer).
* \code
gfx_mono_framebuffer_put_page(data_buf, 0, 10, 32);
\endcode
*/
void gfx_mono_framebuffer_put_page(gfx_mono_color_t *data, gfx_coord_t page,
gfx_coord_t column, gfx_coord_t width)
{
gfx_mono_color_t *data_pt = data;
gfx_coord_t *framebuffer_pt = fbpointer +
((page * GFX_MONO_LCD_WIDTH) + column);
do {
*framebuffer_pt++ = *data_pt++;
} while (--width > 0);
}
/**
* \brief Read a page from the framebuffer
*
* \param[in] data Pointer where to store the read data
* \param[in] page Page address
* \param[in] column Offset into page (x coordinate)
* \param[in] width Number of bytes to be read
*
* The following example will read back the first 128 bytes (first page) from
* the framebuffer:
* \code
gfx_mono_framebuffer_get_page(read_buffer, 0, 0, 128);
\endcode
*/
void gfx_mono_framebuffer_get_page(gfx_mono_color_t *data, gfx_coord_t page, \
gfx_coord_t column, gfx_coord_t width)
{
gfx_coord_t *framebuffer_pt = fbpointer +
((page * GFX_MONO_LCD_WIDTH) + column);
do {
*data++ = *framebuffer_pt++;
} while (--width > 0);
}
/**
* \brief Draw pixel to framebuffer
*
* \param[in] x X coordinate of the pixel
* \param[in] y Y coordinate of the pixel
* \param[in] color Pixel operation
*
*/
void gfx_mono_framebuffer_draw_pixel(gfx_coord_t x, gfx_coord_t y,
gfx_mono_color_t color)
{
uint8_t page;
uint8_t pixel_mask;
uint8_t pixel_value;
/* Discard pixels drawn outside the screen */
if ((x > GFX_MONO_LCD_WIDTH - 1) || (y > GFX_MONO_LCD_HEIGHT - 1)) {
return;
}
page = y / GFX_MONO_LCD_PIXELS_PER_BYTE;
pixel_mask = (1 << (y - (page * 8)));
/*
* Read the page containing the pixel in interest, then perform the
* requested action on this pixel before writing the page back to the
* display.
*/
pixel_value = gfx_mono_framebuffer_get_byte(page, x);
switch (color) {
case GFX_PIXEL_SET:
pixel_value |= pixel_mask;
break;
case GFX_PIXEL_CLR:
pixel_value &= ~pixel_mask;
break;
case GFX_PIXEL_XOR:
pixel_value ^= pixel_mask;
break;
default:
break;
}
gfx_mono_framebuffer_put_byte(page, x, pixel_value);
}
/**
* \brief Get the pixel value at x,y in framebuffer
*
* \param[in] x X coordinate of pixel
* \param[in] y Y coordinate of pixel
* \return Non zero value if pixel is set.
*
*/
uint8_t gfx_mono_framebuffer_get_pixel(gfx_coord_t x, gfx_coord_t y)
{
uint8_t page;
uint8_t pixel_mask;
if ((x > GFX_MONO_LCD_WIDTH - 1) || (y > GFX_MONO_LCD_HEIGHT - 1)) {
return 0;
}
page = y / GFX_MONO_LCD_PIXELS_PER_BYTE;
pixel_mask = (1 << (y - (page * 8)));
return gfx_mono_framebuffer_get_byte(page, x) & pixel_mask;
}
/**
* \brief Put a byte to the framebuffer
*
* \param[in] page Page address
* \param[in] column Page offset (x coordinate)
* \param[in] data Data to be written
*
* This example will put the value 0xFF to the first byte in the framebuffer
* \code
gfx_mono_framebuffer_put_byte(0, 0, 0xFF);
\endcode
*/
void gfx_mono_framebuffer_put_byte(gfx_coord_t page, gfx_coord_t column,
uint8_t data)
{
*(fbpointer + (page * GFX_MONO_LCD_WIDTH) + column) = data;
}
/**
* \brief Get a byte from the framebuffer
*
* \param[in] page Page address
* \param[in] column Page offset (x coordinate)
* \return data from LCD controller or framebuffer.
*
* The following code will read the first byte of the framebuffer
* \code
data = gfx_mono_framebuffer_get_byte(0, 0);
\endcode
*/
uint8_t gfx_mono_framebuffer_get_byte(gfx_coord_t page, gfx_coord_t column)
{
return *(fbpointer + (page * GFX_MONO_LCD_WIDTH) + column);
}
/**
* \brief Read/Modify/Write a byte in the framebuffer
*
* This function will read the byte from the framebuffer and
* do a mask operation on the byte according to the pixel operation selected
* by the color argument and the pixel mask provided.
*
* \param[in] page Page address
* \param[in] column Page offset (x coordinate)
* \param[in] pixel_mask Mask for pixel operation
* \param[in] color Pixel operation
*
* A small example that will XOR the first byte of the framebuffer with 0xAA
* \code
gfx_mono_framebuffer_mask_byte(0,0,0xAA,GFX_PIXEL_XOR);
\endcode
*/
void gfx_mono_framebuffer_mask_byte(gfx_coord_t page, gfx_coord_t column,
gfx_mono_color_t pixel_mask, gfx_mono_color_t color)
{
gfx_mono_color_t temp;
temp = gfx_mono_get_byte(page, column);
switch (color) {
case GFX_PIXEL_SET:
temp |= pixel_mask;
break;
case GFX_PIXEL_CLR:
temp &= ~pixel_mask;
break;
case GFX_PIXEL_XOR:
temp ^= pixel_mask;
break;
}
gfx_mono_put_byte(page, column, temp);
}
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