Diff: Bitmap.cpp

Revision:

0:3058939fa37c

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Bitmap.cpp	Sat Apr 28 21:08:58 2012 +0000
@@ -0,0 +1,73 @@
+#include "Bitmap.h"
+#define OFFSET_LOCATION 0x0a
+#define WIDTH_LOCATION 0x12
+#define HEIGHT_LOCATION 0x16
+
+bool Bitmap::isPixel(int pixel, bool reversed) {
+    if (pixel >= width) { return false; }
+    if (reversed) { pixel = width - pixel - 1; }
+    if ((row_data[pixel/(8*sizeof(char))]>>(8*sizeof(char)-(pixel%(8*sizeof(char)))-1)) & 0x01) { return false; }
+    else { return true; }
+}
+
+bool Bitmap::isPixel(int pixel) {
+    return isPixel(pixel, false);
+}
+
+bool Bitmap::isBlankRow(void) {
+    for (int i = 0; i < width; i++) {
+        if (isPixel(i))
+            return false;
+    }
+    return true;
+}
+
+Bitmap::Bitmap () {
+    loaded = false;
+    fp = NULL;
+    row_data = NULL;
+}
+
+bool Bitmap::openImg(char* filename) {
+    if (fp != NULL) {
+        fclose(fp);
+        free(row_data);
+    }
+    fp = fopen(filename, "rb");
+    loaded = true;
+    fseek(fp, OFFSET_LOCATION, SEEK_SET);
+    fread((char *) &offset, 1, 4, fp);
+    fseek(fp, WIDTH_LOCATION, SEEK_SET);
+    fread((char *) &width, 1, 4, fp);
+    fread(&height, sizeof(long), 1, fp);
+    fseek(fp, HEIGHT_LOCATION, SEEK_SET);
+    row_size = (width % 32) ? 4 * ((width / 32) + 1) :  4 * (width / 32);
+    row_data = (char *) malloc(row_size * sizeof(char));
+    return true;
+}
+
+bool Bitmap::setRow(int row) {
+    if (loaded) {
+        row_num = row;
+        fseek(fp, offset + row * row_size*sizeof(char), SEEK_SET);
+        fread(row_data, sizeof(char), row_size, fp);
+        return true;
+    } else {
+        return false;
+    }
+}
+
+bool Bitmap::closeImg(void) {
+    fclose(fp);
+    free(row_data);
+    return true;
+}
+
+int Bitmap::getHeight() {
+    return height;
+}
+
+int Bitmap::getWidth() {
+    return width;
+}
+ 
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