110 lines
3 KiB
C
110 lines
3 KiB
C
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/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Additional LCD routines not present in the core itself
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*
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* Copyright (C) 2005 Jens Arnold
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*
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* All files in this archive are subject to the GNU General Public License.
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* See the file COPYING in the source tree root for full license agreement.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include "plugin.h"
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#ifdef HAVE_LCD_BITMAP
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/*** globals ***/
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static struct plugin_api *local_rb = NULL; /* global api struct pointer */
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/*** functions ***/
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/* library init */
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void xlcd_init(struct plugin_api* newrb)
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{
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local_rb = newrb;
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}
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/* draw a filled triangle */
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void xlcd_filltriangle(int x1, int y1, int x2, int y2, int x3, int y3)
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{
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int x, y;
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long fp_y1, fp_y2, fp_dy1, fp_dy2;
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/* sort vertices by increasing x value */
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if (x1 > x3)
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{
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if (x2 < x3) /* x2 < x3 < x1 */
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{
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x = x1; x1 = x2; x2 = x3; x3 = x;
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y = y1; y1 = y2; y2 = y3; y3 = y;
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}
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else if (x2 > x1) /* x3 < x1 < x2 */
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{
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x = x1; x1 = x3; x3 = x2; x2 = x;
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y = y1; y1 = y3; y3 = y2; y2 = y;
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}
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else /* x3 <= x2 <= x1 */
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{
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x = x1; x1 = x3; x3 = x;
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y = y1; y1 = y3; y3 = y;
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}
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}
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else
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{
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if (x2 < x1) /* x2 < x1 <= x3 */
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{
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x = x1; x1 = x2; x2 = x;
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y = y1; y1 = y2; y2 = y;
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}
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else if (x2 > x3) /* x1 <= x3 < x2 */
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{
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x = x2; x2 = x3; x3 = x;
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y = y2; y2 = y3; y3 = y;
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}
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/* else already sorted */
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}
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if (x1 < x3) /* draw */
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{
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fp_dy1 = ((y3 - y1) << 16) / (x3 - x1);
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fp_y1 = (y1 << 16) + (1<<15) + (fp_dy1 >> 1);
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if (x1 < x2) /* first part */
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{
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fp_dy2 = ((y2 - y1) << 16) / (x2 - x1);
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fp_y2 = (y1 << 16) + (1<<15) + (fp_dy2 >> 1);
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for (x = x1; x < x2; x++)
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{
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local_rb->lcd_vline(x, fp_y1 >> 16, fp_y2 >> 16);
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fp_y1 += fp_dy1;
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fp_y2 += fp_dy2;
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}
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}
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if (x2 < x3) /* second part */
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{
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fp_dy2 = ((y3 - y2) << 16) / (x3 - x2);
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fp_y2 = (y2 << 16) + (1<<15) + (fp_dy2 >> 1);
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for (x = x2; x < x3; x++)
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{
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local_rb->lcd_vline(x, fp_y1 >> 16, fp_y2 >> 16);
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fp_y1 += fp_dy1;
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fp_y2 += fp_dy2;
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}
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}
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}
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}
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#endif /* HAVE_LCD_BITMAP */
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