72 lines
1.2 KiB
C
72 lines
1.2 KiB
C
typedef struct Point
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{
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int32_t x;
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int32_t y;
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} Point;
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typedef struct Rect
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{
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Point min;
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Point max;
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} Rect;
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static inline int32_t rect_width (Rect *r)
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{
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return (r->max.x - r->min.x);
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}
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static inline int32_t rect_height (Rect *r)
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{
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return (r->max.y - r->min.y);
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}
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typedef uint32_t word_type;
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#define BITS_PER_WORD (8 * sizeof (word_type))
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#define ALL_ONES (~ 0U)
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typedef struct Bitmap
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{
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word_type *bits;
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Rect rect;
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uint32_t row_words;
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} Bitmap;
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#define TF_SRC 0xc
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#define TF_AND 0x8
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#define TF_OR 0xe
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#define TF_XOR 0x6
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Bitmap *create_bitmap (Rect *rect);
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void free_bitmap (Bitmap *bitmap);
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bool get_pixel (Bitmap *bitmap, Point coord);
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void set_pixel (Bitmap *bitmap, Point coord, bool value);
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Bitmap *bitblt (Bitmap *src_bitmap,
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Rect *src_rect,
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Bitmap *dest_bitmap,
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Point *dest_min,
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int tfn,
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int background);
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/* in-place transformations */
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void flip_h (Bitmap *src);
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void flip_v (Bitmap *src);
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void rot_180 (Bitmap *src); /* combination of flip_h and flip_v */
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/* "in-place" transformations - will allocate new memory and free old */
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void transpose (Bitmap *src);
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void rot_90 (Bitmap *src); /* transpose + flip_h */
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void rot_270 (Bitmap *src); /* transpose + flip_v */
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void reverse_bits (uint8_t *p, int byte_count);
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