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#include <SDL2/SDL.h>
#include "demo.h"
void update_demo(struct demo* demo) {
int width, height;
int pixel_width, pixel_height;
SDL_GetWindowSize(demo->win, &width, &height);
SDL_GetRendererOutputSize(demo->ren, &pixel_width, &pixel_height);
demo->display_scale_x = pixel_width / width;
demo->display_scale_y = pixel_height / height;
}
void demo_rendercopy(struct demo* demo,
SDL_Texture* texture,
SDL_Rect* s_rect,
SDL_Rect* d_rect) {
const float scale_x = demo->display_scale_x;
const float scale_y = demo->display_scale_y;
SDL_Rect new_srect;
SDL_Rect new_drect;
if(s_rect) {
new_srect = (SDL_Rect){
.x = s_rect->x * scale_x,
.y = s_rect->y * scale_y,
.w = s_rect->w * scale_x,
.h = s_rect->h * scale_y
};
}
if(d_rect) {
new_drect = (SDL_Rect){
.x = d_rect->x * scale_x,
.y = d_rect->y * scale_y,
.w = d_rect->w * scale_x,
.h = d_rect->h * scale_y
};
}
//Handle edge case where s_rect or d_rect are NULL
SDL_RenderCopy(demo->ren, texture,
s_rect ? &new_srect : NULL,
d_rect ?&new_drect : NULL);
}
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