60 lines
1.5 KiB
C
60 lines
1.5 KiB
C
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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struct bitmap {
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unsigned char *data;
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int width;
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int height;
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};
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struct bitmap * bitmap_new(int width, int height, int value) {
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struct bitmap *bmp = (struct bitmap *)malloc(sizeof(struct bitmap));
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bmp->width = width;
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bmp->height = height;
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int size = (width * height + 7) / 8; // Calculate total bytes needed
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bmp->data = (unsigned char *)calloc(size,1 );
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memset(bmp->data, value ? 0xFF : 0x00, size);
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return bmp;
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}
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int bitmap_set(struct bitmap *bmp, int x, int y, int value) {
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if (x < 0 || y < 0 || x >= bmp->width || y >= bmp->height) {
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return -1; // Return error code if coordinates are out of bounds
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}
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int idx = y * bmp->width + x;
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if (value)
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bmp->data[idx / 8] |= (1 << (idx % 8));
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else
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bmp->data[idx / 8] &= ~(1 << (idx % 8));
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return 0;
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}
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int bitmap_get(struct bitmap *bmp, int x, int y) {
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if (x < 0 || y < 0 || x >= bmp->width || y >= bmp->height) {
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return -1; // Return error code if coordinates are out of bounds
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}
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int idx = y * bmp->width + x;
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return (bmp->data[idx / 8] & (1 << (idx % 8))) != 0;
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}
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void bitmap_free(struct bitmap *bmp) {
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if(bmp)
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{
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if(bmp->data)free(bmp->data);
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free(bmp);
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}
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}
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int test_bitmap() {
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struct bitmap *bmp = bitmap_new(10, 5, 1); // Create a 10x5 bitmap
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if (bitmap_set(bmp, 2, 2, 1) == 0) { // Set bit at position (2,2)
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printf("Bit at (2,2): %d\n", bitmap_get(bmp, 2, 2)); // Get bit at position (2,2)
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}
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bitmap_free(bmp);
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return 0;
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}
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