glcd.c

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/*
        Copyright (c) 2012, Andy Gock

        All rights reserved.

        Redistribution and use in source and binary forms, with or without
        modification, are permitted provided that the following conditions are met:
                * Redistributions of source code must retain the above copyright
                  notice, this list of conditions and the following disclaimer.
                * 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.
                * Neither the name of Andy Gock nor the
                  names of its contributors may be used to endorse or promote products
                  derived from this software without specific prior written permission.

        THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
        ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
        WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
        DISCLAIMED. IN NO EVENT SHALL ANDY GOCK 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.
*/

#include <string.h>
#include <stdio.h>
#include "glcd.h"

uint8_t glcd_buffer[GLCD_LCD_WIDTH * GLCD_LCD_HEIGHT / 8];

glcd_BoundingBox_t glcd_bbox;

uint8_t *glcd_buffer_selected;

glcd_BoundingBox_t *glcd_bbox_selected;

void glcd_update_bbox(uint8_t xmin, uint8_t ymin, uint8_t xmax, uint8_t ymax)
{
        /* Keep and check bounding box within limits of LCD screen dimensions */
        if (xmin > (GLCD_LCD_WIDTH-1)) {
                xmin = GLCD_LCD_WIDTH-1;
        }
        if (xmax > (GLCD_LCD_WIDTH-1)) {
                xmax = GLCD_LCD_WIDTH-1;
        }

        if (ymin > (GLCD_LCD_HEIGHT-1)) {
                ymin = GLCD_LCD_HEIGHT-1;
        }
        if (ymax > (GLCD_LCD_HEIGHT-1)) {
                ymax = GLCD_LCD_HEIGHT-1;
        }

        /* Update the bounding box size */
        if (xmin < glcd_bbox_selected->x_min) {
                glcd_bbox_selected->x_min = xmin;
        }               
        if (xmax > glcd_bbox_selected->x_max) {
                glcd_bbox_selected->x_max = xmax;
        }
        if (ymin < glcd_bbox_selected->y_min) {
                glcd_bbox_selected->y_min = ymin;
        }               
        if (ymax > glcd_bbox_selected->y_max) {
                glcd_bbox_selected->y_max = ymax;
        }                       
}

void glcd_reset_bbox()
{
        /* Used after physically writing to the LCD */
        glcd_bbox_selected->x_min = GLCD_LCD_WIDTH - 1;
        glcd_bbox_selected->x_max = 0;
        glcd_bbox_selected->y_min = GLCD_LCD_HEIGHT -1;
        glcd_bbox_selected->y_max = 0;  
}

void glcd_bbox_reset() {
        glcd_reset_bbox();
}

void glcd_bbox_refresh() {
        /* Marks bounding box as entire screen, so on next glcd_write(), it writes the entire buffer to the LCD */
        glcd_bbox_selected->x_min = 0;
        glcd_bbox_selected->x_max = GLCD_LCD_WIDTH - 1;
        glcd_bbox_selected->y_min = 0;
        glcd_bbox_selected->y_max = GLCD_LCD_HEIGHT -1;         
}

void glcd_clear(void) {
        memset(glcd_buffer_selected, 0x00, GLCD_LCD_WIDTH * GLCD_LCD_HEIGHT / 8);
        glcd_update_bbox(0,0,GLCD_LCD_WIDTH - 1,GLCD_LCD_HEIGHT - 1);
        glcd_write();
}

void glcd_clear_buffer(void) {
        memset(glcd_buffer_selected, 0x00, GLCD_LCD_WIDTH * GLCD_LCD_HEIGHT / 8);
        glcd_update_bbox(0,0,GLCD_LCD_WIDTH - 1,GLCD_LCD_HEIGHT - 1);
}

void glcd_select_screen(uint8_t *buffer, glcd_BoundingBox_t *bbox)
{
        glcd_buffer_selected = buffer;
        glcd_bbox_selected = bbox;
}

void glcd_scroll(int8_t x, int8_t y)
{
        uint8_t row;
        
        for (row=0; row<(GLCD_LCD_HEIGHT / 8); row++) {
                uint8_t x;
                for (x=0; x<GLCD_LCD_WIDTH; x++) {
                        
                }
        }
}

void glcd_scroll_line(void)
{
        uint8_t y;
        uint8_t number_of_rows = GLCD_LCD_HEIGHT / 8;
        for (y=0; y<number_of_rows; y++) {
                if (y < (number_of_rows - 1)) {
                        /* All lines except the last */
                        memcpy(glcd_buffer_selected + y*GLCD_LCD_WIDTH, glcd_buffer_selected + y*GLCD_LCD_WIDTH + GLCD_LCD_WIDTH, GLCD_LCD_WIDTH);
                } else {
                        /* Last line, clear it */
                        memset(glcd_buffer_selected + (number_of_rows - 1)*GLCD_LCD_WIDTH, 0x00, GLCD_LCD_WIDTH);
                }
        }
        glcd_update_bbox(0,0,GLCD_LCD_WIDTH - 1,GLCD_LCD_HEIGHT - 1);
}