Start utilities for drawing

Makefile

@@ -6,7 +6,7 @@ CFLAGS = -Wall -O2 $(CCFLAGS)
 
 PRGNAME = metawatch
 
-MEMBERS = metawatch crc16ccitt mw_main
+MEMBERS = metawatch crc16ccitt mw_utility mw_main
 
 # no need to change anything below this line
 # ------------------------------------------

mw_utility.c

@@ -0,0 +1,90 @@
+/*
+ * (c) 2011 Siegen, Germany by Nils Faerber <nils.faerber@kernelconcepts.de>
+ *
+ * license LGPL
+ */
+
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+
+#include "mw_utility.h"
+#include "metawatch.h"
+
+/*
+ * The pixmap buffer has at least one byte per pixel, even for monochrome (bpp=1)
+ * bitmaps
+ */
+mw_buffer *mw_alloc_pbuffer(unsigned int res_x, unsigned int res_y, unsigned int bpp)
+{
+	mw_buffer *nmwbuf;
+	int pbuf_size;
+
+	nmwbuf = (mw_buffer *) malloc(sizeof(mw_buffer));
+	if (!nmwbuf)
+		return NULL;
+
+	nmwbuf->res_x = res_x;
+	nmwbuf->res_y = res_y;
+	nmwbuf->bpp = bpp;
+
+	pbuf_size = nmwbuf->res_x * nmwbuf->res_y * ((nmwbuf->bpp / 8) + 1);
+	nmwbuf->pbuf = malloc(pbuf_size);
+	if (!nmwbuf->pbuf) {
+		free(nmwbuf);
+		return NULL;
+	} else {
+		memset(nmwbuf->pbuf, 0, pbuf_size);
+		return nmwbuf;
+	}
+}
+
+void mw_free_pbuffer(mw_buffer *mwbuf)
+{
+	if (!mwbuf)
+		return;
+
+	free(mwbuf->pbuf);
+	free(mwbuf);
+}
+
+void mw_dump_mw_buffer(mw_buffer *mwbuf)
+{
+	int x, y;
+	unsigned char clr;
+
+	for (y = 0; y < mwbuf->res_y; y++) {
+		for (x = 0; x < mwbuf->res_x; x++) {
+			clr = *(unsigned char *)(mwbuf->pbuf+((y*mwbuf->res_x)+x));
+			if (clr)
+				fprintf(stderr, ".");
+			else
+				fprintf(stderr, " ");
+		};
+		fprintf(stderr, "\n");
+	};
+}
+
+
+/* clear/fill entire buffer with color */
+void mw_buf_clear(mw_buffer *mwbuf, mw_color clr)
+{
+	int pbuf_size;
+
+	if (!mwbuf)
+		return;
+
+	pbuf_size = mwbuf->res_x * mwbuf->res_y * ((mwbuf->bpp / 8) + 1);
+	memset(mwbuf->pbuf, clr, pbuf_size);
+}
+
+/* draw a single pixel */
+void mw_buf_draw_pixel(mw_buffer *mwbuf, unsigned int x, unsigned int y, mw_color clr)
+{
+	if (!mwbuf)
+		return;
+
+	*(unsigned char *)(mwbuf->pbuf+((y*mwbuf->res_x)+x)) = clr;
+}
+
+

mw_utility.h

@@ -0,0 +1,37 @@
+/*
+ * (c) 2011 Siegen, Germany by Nils Faerber <nils.faerber@kernelconcepts.de>
+ *
+ * license LGPL
+ */
+
+#ifndef _MW_UTILITY_H
+#define _MW_UTILITY_H
+
+typedef struct {
+	unsigned int res_x;
+	unsigned int res_y;
+	unsigned char bpp;
+	void *pbuf;
+} mw_buffer;
+
+typedef enum {
+	MW_BLACK = 0,
+	MW_WHITE,
+} mw_color;
+
+mw_buffer *mw_alloc_pbuffer(unsigned int res_x, unsigned int res_y, unsigned int bpp);
+
+void mw_free_pbuffer(mw_buffer *mwbuf);
+
+void mw_dump_mw_buffer(mw_buffer *mwbuf);
+
+
+/* clear/fill entire buffer with color */
+void mw_buf_clear(mw_buffer *mwbuf, mw_color clr);
+
+/* draw a single pixel */
+void mw_buf_draw_pixel(mw_buffer *mwbuf, unsigned int x, unsigned int y, mw_color clr);
+
+
+#endif
+