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erc-c/include/vm_area.h
2018-03-12 00:33:08 -05:00

48 lines
1.2 KiB
C

#ifndef _VM_AREA_H_
#define _VM_AREA_H_
#include <stdlib.h>
typedef struct {
/*
* These are the x and y coordinate offsets in the logical dimension
* established in a vm_screen. An offset of (0, 0) would be in the
* top-left; (5, 5) would be 5 pixels down, and 5 pixels to the
* right, of that top-left corner.
*/
uint32_t xoff;
uint32_t yoff;
/*
* These are the width and height of the area we're defining. A
* single pixel in the logical area would have a width and height of
* (1, 1); use larger numbers to indicate a larger square (if the
* two are equal) or rectangle (if unequal).
*/
uint32_t width;
uint32_t height;
} vm_area;
/*
* Set the contents of an SDL_Rect to the equivalent fields contained in
* a vm_area.
*/
#define SET_SDL_RECT(name, a) \
(name).x = (a).xoff; \
(name).y = (a).yoff; \
(name).w = (a).width; \
(name).h = (a).height
/*
* Much like SET_SDL_RECT(), except this will (as a side-effect!)
* declare an SDL_Rect variable (`name`) and pass that into the SET
* macro.
*/
#define MAKE_SDL_RECT(name, a) \
SDL_Rect name; \
SET_SDL_RECT(name, a)
extern void vm_area_set(vm_area *, uint32_t, uint32_t, uint32_t, uint32_t);
#endif