Use floating point values for viewport, clip rectangle, and texture sizes

These are integer values internally, but the API has been changed to make it easier to mix other render code with querying those values.

Fixes https://github.com/libsdl-org/SDL/issues/7519

test/testscale.c

@@ -49,7 +49,7 @@ quit(int rc)
 
 static void Draw(DrawState *s)
 {
-    SDL_Rect viewport;
+    SDL_FRect viewport;
 
     SDL_GetRenderViewport(s->renderer, &viewport);
 
@@ -68,8 +68,8 @@ static void Draw(DrawState *s)
             s->scale_direction = 1;
         }
     }
-    s->sprite_rect.x = (float)((viewport.w - s->sprite_rect.w) / 2);
-    s->sprite_rect.y = (float)((viewport.h - s->sprite_rect.h) / 2);
+    s->sprite_rect.x = ((viewport.w - s->sprite_rect.w) / 2);
+    s->sprite_rect.y = ((viewport.h - s->sprite_rect.h) / 2);
 
     SDL_RenderTexture(s->renderer, s->sprite, NULL, &s->sprite_rect);
 
@@ -126,7 +126,7 @@ int main(int argc, char *argv[])
     drawstates = SDL_stack_alloc(DrawState, state->num_windows);
     for (i = 0; i < state->num_windows; ++i) {
         DrawState *drawstate = &drawstates[i];
-        int w, h;
+        float w, h;
 
         drawstate->window = state->windows[i];
         drawstate->renderer = state->renderers[i];
@@ -135,9 +135,9 @@ int main(int argc, char *argv[])
         if (!drawstate->sprite || !drawstate->background) {
             quit(2);
         }
-        SDL_QueryTexture(drawstate->sprite, NULL, NULL, &w, &h);
-        drawstate->sprite_rect.w = (float)w;
-        drawstate->sprite_rect.h = (float)h;
+        SDL_GetTextureSize(drawstate->sprite, &w, &h);
+        drawstate->sprite_rect.w = w;
+        drawstate->sprite_rect.h = h;
         drawstate->scale_direction = 1;
     }