29 lines
794 B
C
29 lines
794 B
C
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#ifndef _IMAGE_H_
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#define _IMAGE_H_
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#include <SDL/SDL.h>
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// get pixel/something in array p of size w*h
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#define PX_(p, x, y, w, h) ((p)[(x)+(y)*(w)])
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// get pixel in SDL_Surface i
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#define PX(i,x,y) (PX_((uint32_t*)(i)->pixels, (x), (y), (i)->w, (i)->h))
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// get color components of pixel value. should probably be done in a nicer way
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#define PXR(px) ((px) & 0xff)
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#define PXG(px) (((px) & 0xff00) >> 8)
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#define PXB(px) (((px) & 0xff0000) >> 16)
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//get the grayscale value of the pixel
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#define GRAY(px) ((PXR(px) + PXG(px) + PXB(px)) / 3)
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// iterate over SDL_Surface s with variables x, y
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#define iter_pixels(s,x,y) for (x = 0; x < s->w; x++) for (y = 0; y < s->h; y++)
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namespace Image
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{
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void threshold(SDL_Surface *image, int lowerBound, int upperBound);
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}
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#endif /* ifndef _IMAGE_H_ */
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