Steven Rhodes / CNCAirbrush

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Bitmap.cpp@3:328a79795feb, 2012-04-18 (annotated)

Committer:
stvnrhodes
Date:
Wed Apr 18 23:59:09 2012 +0000
Revision:
3:328a79795feb
Parent:
2:6d2a681c5cdf
Child:
5:c599a5c5256e

        

        
Who changed what in which revision?

        

            
                
UserRevisionLine numberNew contents of line

            
            


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#include "Bitmap.h"





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#define OFFSET_LOCATION 0x0a





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#define WIDTH_LOCATION 0x12





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#define HEIGHT_LOCATION 0x16





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bool Bitmap::isPixel(int pixel) {





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    if (pixel > width) { return false; }





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    if ((row_data[pixel/32]>>(pixel%32)) & 0x01) { return false; }





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    else { return true; }





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}





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Bitmap::Bitmap () {





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    loaded = false;





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    fp = NULL;





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    row_data = NULL;





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}





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bool Bitmap::openImg(char* filename) {





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    if (fp != NULL) {





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        fclose(fp);





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        free(row_data);





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    }





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    fp = fopen(filename, "rb");





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    loaded = true;





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    fseek(fp, OFFSET_LOCATION, SEEK_SET);





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    fread((char *) &offset, 1, 4, fp);





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    fseek(fp, WIDTH_LOCATION, SEEK_SET);





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    fread((char *) &width, 1, 4, fp);





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    fread(&height, sizeof(long), 1, fp);





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    fseek(fp, HEIGHT_LOCATION, SEEK_SET);





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    row_size = (width % 32) ? (width / 32) + 1 :  width / 32;





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    row_data = (long *) malloc(row_size * sizeof(long));





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    return true;





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}





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bool Bitmap::setRow(int row) {





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    if (loaded) {





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        row_num = row;





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        fseek(fp, offset + row * row_size*sizeof(long), SEEK_SET);





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        for (int i = 0; i < row_size; i++) {





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            fread(row_data + i, sizeof(long), 1, fp);





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        }





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        return true;





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    } else {





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        return false;





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    }





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}





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bool Bitmap::closeImg(void) {





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    fclose(fp);





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    free(row_data);





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    return true;





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}





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int Bitmap::getHeight() {





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    return height;





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}





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int Bitmap::getWidth() {





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    return width;





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}





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