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46 lines
1.2 KiB
C
46 lines
1.2 KiB
C
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#ifndef _VM_AREA_H_
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#define _VM_AREA_H_
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typedef struct {
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/*
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* These are the x and y coordinate offsets in the logical dimension
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* established in a vm_screen. An offset of (0, 0) would be in the
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* top-left; (5, 5) would be 5 pixels down, and 5 pixels to the
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* right, of that top-left corner.
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*/
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int xoff;
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int yoff;
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/*
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* These are the width and height of the area we're defining. A
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* single pixel in the logical area would have a width and height of
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* (1, 1); use larger numbers to indicate a larger square (if the
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* two are equal) or rectangle (if unequal).
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*/
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int width;
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int height;
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} vm_area;
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/*
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* Set the contents of an SDL_Rect to the equivalent fields contained in
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* a vm_area.
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*/
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#define SET_SDL_RECT(name, a) \
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(name).x = (a).xoff; \
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(name).y = (a).yoff; \
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(name).w = (a).width; \
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(name).h = (a).height
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/*
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* Much like SET_SDL_RECT(), except this will (as a side-effect!)
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* declare an SDL_Rect variable (`name`) and pass that into the SET
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* macro.
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*/
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#define MAKE_SDL_RECT(name, a) \
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SDL_Rect name; \
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SET_SDL_RECT(name, a)
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extern void vm_area_set(vm_area *, int, int, int, int);
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#endif
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